JP6406224B2 - Drive transmission device and image forming apparatus having the same - Google Patents

Description

  The present invention relates to a drive transmission device that transmits a driving force to a rotating body, and an image forming apparatus including the drive transmission device.

  Image forming apparatuses such as full-color laser printers and copying machines include image forming units including photosensitive drums and developing devices for four colors of cyan (C), magenta (M), yellow (Y), and black (Bk). Is provided. Each image forming unit includes a photosensitive drum and a developing roller disposed in the developing device as a rotating body.

  In each image forming unit, the photosensitive drum and the developing device can be attached to and detached from the main body of the image forming apparatus. For this reason, in each image forming unit, a coupling member as a driving member that transmits a driving force to the photosensitive drum and the developing roller needs to be separated from the photosensitive drum and the developing roller corresponding to the detachment operation. (See Patent Documents 1 to 4).

Japanese Patent Laid-Open No. 2000-214685 JP-A-2005-76734 JP 2006-214567 A JP 2008-95870 A

  In the prior art described above, when simultaneously performing the separating operation of the driving members corresponding to the plurality of rotating bodies included in each image forming unit, the load required for the separating operation increases, and a large operating force is required for the operator. There is a problem of being done. As a technique for reducing the load on the operator when simultaneously performing the separating operation of the driving members corresponding to the plurality of rotating bodies, the connecting and separating operations of the driving members with respect to the rotating bodies are There is a technique that is executed in conjunction with the opening / closing operation of the opening / closing cover. However, when the operator performs a confirmation operation of the driving operation of each rotating body in a state where the opening / closing cover is removed from the apparatus main body, the connection and separation operation of each driving member with respect to each rotating body is not performed. That is, the driving members corresponding to the plurality of rotating bodies need to be configured to be able to be connected to and separated from the rotating bodies independently of the interlocking member such as the opening / closing cover.

  An object of the present invention is to reduce a load on an operator when simultaneously performing a separating operation of a driving member with respect to each rotating body in a drive transmission device that transmits a driving force to a plurality of rotating bodies. In contrast, the present invention provides a drive transmission device capable of connecting and separating a drive member independently from an interlocking member, and an image forming apparatus including the drive transmission device.

  A drive transmission device according to an aspect of the present invention includes a first structure and a second structure including a combination of a first rotator and a second rotator, the first rotator and the second rotator. A drive transmission device for transmitting a driving force generated by a driving source, wherein the driving force generated by the driving source is transmitted to the first rotating body and the second rotating body of the first structure. A drive transmission mechanism; a second drive transmission mechanism that transmits a driving force generated by the drive source to the first rotating body and the second rotating body of the second structure; and driving of the first drive transmission mechanism. An interlocking member that interlocks the transmission operation with the drive transmission operation of the second drive transmission mechanism. Each of the first drive transmission mechanism and the second drive transmission mechanism receives a driving force from the drive source and rotates the first rotating body around a first rotation axis, coaxially with the first rotation axis. A first driving member disposed in the axial direction of the first rotating shaft and connected to and separated from the first rotating body; and disposed coaxially with the first rotating shaft and around the first rotating shaft. The first drive member is connected to the first rotating body by rotating in the forward rotation direction, and the first drive member is rotated by rotating in the reverse rotation direction opposite to the normal rotation direction. A first rotating member separated from the first rotating body, the first rotating member having a first engaging portion at a part of an outer peripheral edge; and the second rotating member that receives a driving force from the driving source. A body is rotated about a second rotation axis parallel to the first rotation axis, and is disposed coaxially with the second rotation axis; A second driving member that can be connected to and separated from the second rotating body in the axial direction of the second rotating shaft, and a positive rotation about the second rotating shaft that is disposed coaxially with the second rotating shaft. The second drive member is connected to the second rotating body by rotating in the direction, and the second drive member is rotated in the reverse direction opposite to the normal rotation direction by rotating the second drive member in the second rotation. A second rotating member separated from the body, the second rotating member having a second engaging portion at a part of an outer peripheral edge, and the first rotating member connected to the first engaging portion of the first rotating member; A first connecting portion; a second connecting portion connected to the second engaging portion of the second rotating member; and spanning between the first engaging portion and the second engaging portion. Is passed and swung along a plane perpendicular to the first rotating shaft and the second rotating shaft, thereby rotating the first rotating member and rotating the second rotating member. It includes a link member that links the operation, the. The interlocking member is detachably connected to the link member of the first drive transmission mechanism and the link member of the second drive transmission mechanism, and moves along a predetermined direction parallel to the one plane. The rocking operation of the link member of the first drive transmission mechanism and the rocking operation of the link member of the second drive transmission mechanism are interlocked.

  According to this drive transmission device, the swing operation of the link member of the first drive transmission mechanism and the swing operation of the link member of the second drive transmission mechanism can be executed in conjunction with the movement operation of the interlock member. . As a result, in each of the first drive transmission mechanism and the second drive transmission mechanism, the first drive member according to the rotation operation of the first rotation member and the second rotation member interlocked with the swinging operation of the link member. It is possible to execute the connecting and separating operations with respect to the first rotating body and the connecting and separating operations with respect to the second rotating body of the second drive member. That is, in each of the first drive transmission mechanism and the second drive transmission mechanism, the separating operation of the first driving member with respect to the first rotating body and the separating operation of the second driving member with respect to the second rotating body are performed by the movement operation of the interlocking member. Can be executed simultaneously. For this reason, it is possible to reduce the load on the operator when simultaneously performing the separating operation of the driving member with respect to each rotating body.

  The interlocking member is detachably connected to the link member of the first drive transmission mechanism and the link member of the second drive transmission mechanism. By detaching the interlocking member from the link member of each drive transmission mechanism, the first rotation member and the first rotation member interlocked with the swinging motion of the link member in each of the first drive transmission mechanism and the second drive transmission mechanism. The driving member can be connected to and separated from each rotating body independently of the interlocking member according to the rotating operation of the two rotating members.

In the above drive transmission device, the first turning radius of the turning motion of the first turning member is different from the second turning radius of the turning motion of the second turning member, and the link member A line segment connecting the center of the first connection part and the center of the second connection part, and a straight line that is perpendicular to the first rotation axis and the second rotation axis and extends along the moving direction of the interlocking member . It is desirable that the formed angle changes according to the swinging motion of the link member.

  According to this drive transmission device, in the configuration in which the first turning member and the second turning member have different turning radii, the first connecting portion is connected to the first turning member, and the second turning member is connected to the second turning member. The swinging motion of the link member to which the second connection portion is connected is executed such that the angle formed by the line segment connecting the center of the first connection portion and the center of the second connection portion and the straight line changes. Therefore, the rotating operation of the first rotating member and the second rotating member linked to the swinging operation of the link member is smooth even in a configuration with different rotating radii.

  In the drive transmission device described above, it is preferable that the first drive transmission mechanism and the second drive transmission mechanism constitute one unit structure, and the interlocking member is separate from the unit structure. .

  According to this drive transmission device, in the configuration in which the first drive transmission mechanism and the second drive transmission mechanism are one unit structure, the interlocking member is configured separately from the unit structure. Therefore, the attachment and detachability of the interlocking member that is detachably connected to the link member provided in the first drive transmission mechanism and the link member provided in the second drive transmission mechanism of the unit structure can be reduced. Can be improved. As a result, it is possible to improve workability when the linking member is detached from each link member and the driving member is connected to and separated from each rotating body independently from the linking member.

  An image forming apparatus according to another aspect of the present invention includes a first structure and a second structure including a combination of a first rotating body and a second rotating body, and forms an image on a sheet. The driving force generated by the driving source is transmitted to a system, a driving source that generates a driving force for driving the imaging system, and the first rotating body and the second rotating body. A drive transmission device.

  According to this image forming apparatus, the separating operation of the first driving member with respect to the first rotating body and the separating operation of the second driving member with respect to the second rotating body can be executed simultaneously by the moving operation of the interlocking member. For this reason, the load on the operator when the separating operation of the driving member with respect to each rotating body is simultaneously performed is preferably reduced. In addition, by detaching the interlocking member from each link member, it is driven with respect to each rotating body according to the pivoting operation of the first pivoting member and the second pivoting member interlocked with the swinging motion of the link member. The member can be connected and separated independently from the interlocking member.

  In the image forming apparatus, the first rotating body is one of an image carrier having a peripheral surface for supporting a developer image, and a developing roller for supplying a developer to the peripheral surface of the image carrier, The second rotating body is preferably the other of the image carrier and the developing roller.

  According to this image forming apparatus, the load on the operator when the separating operation of the driving member with respect to each image carrier and each developing roller is executed simultaneously is suitably reduced. Further, the driving member can be connected to and separated from each image carrier and each developing roller independently from the interlocking member.

  According to the present invention, in a drive transmission device that transmits a driving force to a plurality of rotating bodies, a load on an operator when simultaneously performing a separating operation of a driving member with respect to each rotating body is reduced, and each rotating body In contrast, it is possible to provide a drive transmission device capable of connecting and separating the drive member independently from the interlocking member, and an image forming apparatus including the drive transmission device.

1 is a perspective view of an image forming apparatus according to an embodiment of the present invention. FIG. 3 is a perspective view of the image forming apparatus with a different perspective direction. 2 is a cross-sectional view illustrating an internal structure of the image forming apparatus. FIG. FIG. 4 is a diagram schematically adding a drive transmission system to the cross-sectional view of FIG. 3. FIG. 2 is a perspective view of the image forming apparatus shown in FIG. 1 with a left side plate removed. It is a perspective view which shows the frame structure of an image forming apparatus. It is a perspective view which shows the frame structure of an image forming apparatus. It is a block diagram which shows the structure of the 1st drive transmission system in the drive transmission apparatus which concerns on one Embodiment of this invention. It is a block diagram which shows the structure of the 2nd drive transmission system in the drive transmission apparatus which concerns on one Embodiment of this invention. It is a top view which shows the gear train which forms the drive transmission path | route in the 1st drive transmission system of a drive transmission apparatus. It is a perspective view which shows the structure of the 1st drive transmission system of a drive transmission apparatus. It is a perspective view which shows the structure of the unit structure in the 1st drive transmission system of a drive transmission apparatus. It is a top view which shows the structure of the unit structure in the 1st drive transmission system of a drive transmission apparatus. It is a figure for demonstrating rotation operation | movement of the rotation member with which the 1st drive transmission mechanism which comprises a 1st drive transmission system is equipped, (A) is a rotation member reaching | attaining the rotation termination position in a normal rotation direction. (B) shows a state in which the rotating member has reached the rotation intermediate position, and (C) shows a state in which the rotating member has reached the rotation end position in the reverse rotation direction. FIG. 7 is a diagram for explaining the connecting operation of the drum coupling member to the photosensitive drum and the connecting operation of the developing coupling member to the developing roller in the first driving transmission system of the drive transmitting device, and FIG. , (B) shows a view from above, and (C) illustrates the first drive transmission mechanism. 4A and 4B are diagrams for explaining the connecting operation of the drum coupling member to the photosensitive drum in the first drive transmission system of the drive transmission device, where FIG. 5A is a perspective view, and FIG. FIG. 7 is a diagram for explaining the separation operation of the drum coupling member with respect to the photosensitive drum and the separation operation of the development coupling member with respect to the developing roller in the first drive transmission system of the drive transmission device. FIG. , (B) shows a view from above, and (C) illustrates the first drive transmission mechanism. 4A and 4B are diagrams for explaining a separation operation of the drum coupling member with respect to the photosensitive drum in the first drive transmission system of the drive transmission device, where FIG. 5A is a perspective view, and FIG. FIG. 6 is a diagram illustrating a state of a swinging operation of a link member when a separating operation of a drum coupling member with respect to a photosensitive drum and a separating operation of a developing coupling member with respect to a developing roller are executed by a movement operation of an interlocking member. is there. FIG. 6 is a diagram illustrating a state of a swinging operation of a link member when a separating operation of a drum coupling member with respect to a photosensitive drum and a separating operation of a developing coupling member with respect to a developing roller are executed by a movement operation of an interlocking member. is there. FIG. 6 is a diagram illustrating a state of a swinging operation of a link member when a separating operation of a drum coupling member with respect to a photosensitive drum and a separating operation of a developing coupling member with respect to a developing roller are executed by a movement operation of an interlocking member. is there.

  Hereinafter, a drive transmission device and an image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are perspective views of an image forming apparatus 1 according to an embodiment of the present invention. Although the image forming apparatus 1 is a full-color printer, in other embodiments, the image forming apparatus 1 may be a full-color copying machine, a facsimile machine, a multifunction machine having these functions, or the like.

  Note that the terms used in the following description, such as “up”, “down”, “front”, “rear”, “left” and “right”, are merely for the purpose of clarifying the description. There is no limitation on the principle of the image forming apparatus 1. In the following description, the term “sheet” means copy paper, coated paper, OHP sheet, cardboard, postcard, tracing paper, other sheet material subjected to image forming processing, or any processing other than image forming processing. Means the sheet material to receive.

  The image forming apparatus 1 includes a main body housing 10 which is a box-shaped apparatus main body that houses various apparatuses for forming an image on a sheet. The front, rear, left and right side surfaces of the main body housing 10 are covered with a front side plate 101, a left side plate 102, a right side plate 103, and a rear side plate 104 that also serve as exteriors. The right rear corner portion of the main body housing 10 is covered with a corner side plate 103A. The upper surface of the main body housing 10 is covered with a top plate 105. A bulging portion 106 having a paper discharge port 17H is provided on the rear side of the top plate 105, and a paper discharge tray 107 for receiving sheets discharged from the paper discharge port 17H is provided on the front side. An operation unit 108 that receives operation information for the image forming apparatus 1 from the user is disposed near the right end of the top plate 105. A paper feed cassette 11 is detachably attached to the bottom of the main body housing 10.

  FIG. 3 is a cross-sectional view showing an internal configuration of the image forming apparatus 1. FIG. 3 shows a state where the paper feeding device 12 is added below the paper feeding cassette 11. The image forming apparatus 1 includes a paper feeding cassette 11 as a paper feeding unit, a paper feeding device 12, a manual feed tray 13, an image forming unit 2 (image forming system) for forming a toner image (developer image), and an intermediate transfer unit. 3, a fixing unit 4, and a sheet conveyance system that includes the sheet feeding unit and the sheet discharge tray 107 and conveys a sheet within the main body housing 10.

  The paper feed cassette 11 accommodates a bundle of sheets S onto which toner images are transferred. The sheet feeding cassette 11 includes a sheet storage unit 111 that stores the bundle of sheets S, a lift plate 112 on which the bundle of sheets S is placed, and the uppermost sheet of the bundle of sheets S through the main transport path P1. And a paper feed roller 113 that feeds the paper. The sheet feeding device 12 is an optional sheet feeding unit that is attached to the bottom of the main body housing 10, and similarly includes a sheet storage unit 121, a lift plate 122, and a sheet feeding roller 123. The sheet feeding device 12 includes a communication conveyance path P4 through which a sheet fed by the sheet feeding roller 123 passes, and a feeding roller 124 is disposed at the downstream end thereof. The manual feed tray 13 is a tray on which a manual feed sheet is placed. Near the manual feed tray 13, a nip roller 131 for taking in the manual feed sheet and a manual feed roller 132 for feeding the manual feed sheet to the manual feed path PM are arranged. A plurality of transport rollers 133 are arranged along the manual transport path PM.

  The image forming unit 2 includes four image forming units that respectively form toner images of respective colors of black (Bk), yellow (Y), cyan (C), and magenta (M). That is, the image forming unit 2 includes a first image forming unit 2Bk (first structure) for forming a black toner image and a second image forming unit for forming a yellow toner image. 2Y (second structure), a third image forming unit 2C for forming a cyan toner image, and a fourth image forming unit 2M for forming a magenta toner image; It has.

  The first image forming unit 2Bk, the second image forming unit 2Y, the third image forming unit 2C, and the fourth image forming unit 2M are respectively a photosensitive drum 21 (image carrier), a charging device 22, a developing device 23, and a primary. A transfer roller 24 and a cleaning device 25 are provided. That is, the image forming unit 2 includes a combination of the photosensitive drum 21 and the developing device 23 for four colors. Further, the image forming unit 2 includes an optical scanning device 26 that is commonly used in the four color image forming units.

  In the following description, the photosensitive drum 21 and the developing device 23 (developing roller 231) provided in the first image forming unit 2Bk, the second image forming unit 2Y, the third image forming unit 2C, and the fourth image forming unit 2M, respectively. ) In particular, the photosensitive drum and the developing roller as rotating bodies provided in the first image forming unit 2Bk are respectively referred to as “first photosensitive drum 21Bk (first rotating body)” and “first developing roller”. 231Bk (second rotating body) ", and the photosensitive drum and the developing roller as rotating bodies provided in the second image forming unit 2Y are respectively referred to as" second photosensitive drum 21Y (first rotating body) "and" second rotating body ". It is referred to as “developing roller 231Y (second rotating body)”, and a photosensitive drum as a rotating body provided in the third image forming unit 2C and development. The rollers are referred to as “third photosensitive drum 21C (first rotating member)” and “third developing roller 231C (second rotating member)”, respectively, and the photosensitive drum as a rotating member provided in the fourth image forming unit 2M. And the developing roller are referred to as “fourth photosensitive drum 21M (first rotating body)” and “fourth developing roller 231M (second rotating body)”, respectively.

  The photosensitive drum 21 is a cylindrical member, and carries an electrostatic latent image and a toner image (developer image) on its peripheral surface. The photosensitive drum 21 includes a drum rotation shaft extending in the left-right direction, and is driven to rotate around the drum rotation shaft. The charging device 22 charges the peripheral surface of the photosensitive drum 21 substantially uniformly. The optical scanning device 26 includes a light source that emits laser light for scanning, a polygon mirror for deflection, and an imaging optical system. The optical scanning device 26 irradiates the circumferential surface of the photosensitive drum 21 that is substantially uniformly charged with laser light corresponding to the image data to form an electrostatic latent image.

  The developing device 23 develops and exposes the electrostatic latent image, and includes a developing roller 231 that supplies toner (developer) to the peripheral surface of the photosensitive drum 21 on which the electrostatic latent image is formed. The developing roller 231 includes a roller rotation shaft extending in the left-right direction, and is driven to rotate around the roller rotation shaft. By supplying toner from the developing device 23, a toner image is formed on the peripheral surface of the photosensitive drum 21.

  The primary transfer roller 24 is disposed so as to face the photosensitive drum 21 from above, and a transfer nip portion is formed by sandwiching an intermediate transfer belt 31 described later. The primary transfer roller 24 is given a transfer bias for transferring the toner image carried on the photosensitive drum 21 onto the intermediate transfer belt 31. The cleaning device 25 removes the toner remaining on the peripheral surface of the photosensitive drum 21 after the toner image is transferred to the sheet S.

  The image forming apparatus 1 further includes a toner container 27 for supplying toner to the developing device 23. In FIG. 3, only the toner container 27 for the second image forming unit 2Y is shown, and illustrations for other colors are omitted. The toner container 27 includes a container main body 27H that stores toner of each color, and a feeder 271 that is disposed inside the container main body 27H and conveys the stored toner toward a toner discharge port (not shown). The feeder 271 includes a rotating shaft extending in the left-right direction and a spiral piece provided on the periphery of the rotating shaft, and is driven to rotate about the rotating shaft.

  The intermediate transfer unit 3 is disposed above the image forming unit 2, and an intermediate transfer belt 31 on which a toner image carried on the peripheral surface of the photosensitive drum 21 is primarily transferred, and a belt drive that drives the intermediate transfer belt 31 to rotate. A roller 32 and a tension roller 33. The intermediate transfer belt 31 is an endless belt and has an outer peripheral surface to which the toner image is primarily transferred. The intermediate transfer belt 31 is stretched between a belt driving roller 32 and a tension roller 33, and travels around when the belt driving roller 32 is rotationally driven. The secondary transfer roller 15 is pressed against the belt driving roller 32 via the intermediate transfer belt 31 to form a secondary transfer portion.

  The fixing unit 4 includes a fixing roller 41 having a built-in heat source, and a pressure roller 42 that forms a fixing nip portion together with the fixing roller 41. Each of the fixing roller 41 and the pressure roller 42 includes a rotation shaft extending in the left-right direction, and is driven to rotate around the rotation shaft. The fixing unit 4 performs a fixing process for fusing the toner to the sheet by conveying the sheet on which the toner image has been transferred in the secondary transfer unit while heating and pressing the sheet in the fixing nip unit.

  The image forming apparatus 1 includes the above-described paper feeding cassette 11, paper feeding device 12, and manual feed tray 13 as a sheet conveying system, a paper feeding unit that feeds a sheet on which a toner image is secondarily transferred, and a secondary transfer. The sheet discharge tray 107 that receives a subsequent sheet, various sheet conveyance paths, and sheet conveyance rollers arranged in these sheet conveyance paths are included.

  The sheet conveyance path includes a main conveyance path P1, a reverse conveyance path P2, communication conveyance paths P3 and P4, and the manual conveyance path PM described above. The main conveyance path P1 extends substantially in the vertical direction, and conveys the sheet from the sheet feeding unit to the sheet discharge tray 107 via the intermediate transfer unit 3 (secondary transfer unit) and the fixing unit 4 (fixing nip unit). Road. The reverse conveyance path P2 is a conveyance path that reversely conveys the sheet from the vicinity of the downstream end of the main conveyance path P1 to the vicinity of the upstream end when double-sided printing is performed on the sheet. The communication conveyance path P3 on the main body housing 10 side and the communication conveyance path P4 on the paper feeding device 12 side are conveyance paths that communicate with each other when the paper feeding device 12 is mounted on the main body housing 10. The downstream end of the communication transport path P3 and the downstream end of the manual transport path PM are connected to the vicinity of the upstream end of the main transport path P1.

  As the sheet conveying rollers, in addition to the paper feeding rollers 113, 123, 132, the feeding roller 124, and the conveying roller 133 described above, in the present embodiment, the registration roller 14 and the secondary transfer roller 15 arranged in the main conveying path P1. , A conveyance roller 16 and a paper discharge roller 17 at the fixing exit, and reverse conveyance rollers 181 and 182 arranged in the reverse conveyance path P2.

  The registration roller 14 is disposed on the upstream side of the secondary transfer portion in the main transport path P1. The registration roller 14 temporarily waits the sheet and then supplies the sheet to the secondary transfer unit at a predetermined timing. The secondary transfer roller 15 is disposed opposite to the belt driving roller 32 with the intermediate transfer belt 31 interposed therebetween, and forms the secondary transfer portion. The sheet passing through the secondary transfer portion is conveyed downstream while in contact with the secondary transfer roller 15 and the intermediate transfer belt 31.

  The transport roller 16 is a roller that transports the sheet that has passed through the fixing unit 4 toward the paper discharge port 17H. The paper discharge roller 17 is a roller that discharges the sheet subjected to the secondary transfer and the fixing process from the main transport path P1 to the paper discharge tray 107 through the paper discharge port 17H. The reverse conveyance rollers 181 and 182 are rollers that reversely convey the sheet in the reverse conveyance path P2. Note that the pair of the fixing roller 41 and the pressure roller 42 also plays a role of sheet conveyance in the main conveyance path P1.

  FIG. 4 is a diagram in which a drive source and a drive transmission system are schematically added to the cross-sectional view of the image forming apparatus 1 shown in FIG. In FIG. 4, the toner container 27 is not shown. As described above, the image forming apparatus 1 includes the photosensitive drum 21 and the developing roller 231 included in the image forming unit 2, the belt driving roller 32 included in the intermediate transfer unit 3, the fixing roller 41 and the pressure roller 42 of the fixing unit 4, It includes a large number of rotating bodies that require rotational driving, such as a transport roller group included in the sheet transport system. The image forming apparatus 1 of the present embodiment includes only two drive motors, that is, only the first drive motor M1 and the second drive motor M2, as drive sources for driving these rotating bodies.

  The first drive force generated by the first drive motor M1 is transmitted to predetermined parts by the first drive transmission system 50. Further, the second driving force generated by the second driving motor M2 is transmitted to predetermined parts by the second driving transmission system 60. Each of the first drive transmission system 50 and the second drive transmission system 60 includes a plurality of gear members and various clutch members, and these are integrally assembled together with the drive motors M1 and M2 in a dedicated box.

  FIG. 5 is a diagram illustrating a state in which the first drive box 50B that holds the first drive motor M1 and the first drive transmission system 50 is attached to the main body housing 10. FIG. 5 is a perspective view of the state in which the left side plate 102 is removed from the perspective view of FIG.

  The first drive box 50 </ b> B is attached to the left side surface of the main body housing 10. On the other hand, a second drive box (not shown) that holds the second drive motor M <b> 2 and the second drive transmission system 60 is attached to the right side surface of the main body housing 10. Thus, by arranging the first drive box 50B and the second drive box on the side surfaces facing each other, the influence of one vibration can be made difficult to reach the other. In particular, the first drive transmission system 50 that affects the image quality can be made less susceptible to the vibrations of the second drive motor M2 and the second drive transmission system 60.

  6 and 7 are perspective views showing a frame structure 19 constituting the framework of the main body housing 10. The frame structure 19 hangs around the bottom frame 191, the left side frame 192 and the right side frame 193 erected from the left and right edges of the bottom frame 191, and the middle of the side frames 192 and 193 in the vertical direction. And an intermediate frame 194 passed. In the space surrounded by the bottom frame 191 and the side frames 192 and 193, the image forming unit 2, the intermediate transfer unit 3, the fixing unit 4 and the sheet conveying system are accommodated and held. The intermediate frame 194 is a frame that holds the image forming unit 2 from the lower surface side.

  The first drive box 50B is attached to the outer surface side of the left side frame 192. On the inner surface side of the left side frame 192, the gear coupling portion of the first drive box 50B is exposed. The second drive box 60B is attached near the rear end of the right side frame 193. As described above, the first drive box 50B and the second drive box 60B are mounted on the left side frame 192 and the right side frame 193, respectively, located at the counter electrode of the frame structure 19. A bottom frame 191 and an intermediate frame 194 are interposed between the side frames 192 and 193. Therefore, the drive system that is driven by the first drive box 50B and the drive system that is driven by the second drive box 60B have a structure that is not easily affected by vibration.

  Next, a drive transmission device including the first drive transmission system 50 and the second drive transmission system 60 will be described in detail with reference to FIGS. 4, 8, and 9. FIG. 8 is a block diagram showing the configuration of the first drive transmission system 50 in the drive transmission device 5 according to the present embodiment, and FIG. 9 is a block diagram showing the configuration of the second drive transmission system 60 in the drive transmission device 5. It is. 8 and 9, “ONEWAY” indicates a one-way clutch, and “CL” indicates an electromagnetic clutch. “SOL” indicates a solenoid actuator for switching a connection state or a disconnection state with respect to a drive transmission system for some drive components.

  The first drive transmission system 50 transmits the first driving force generated by the first driving motor M1 only to the photosensitive drum 21 and the developing roller 231 of the developing device 23. Specifically, the first drive transmission system 50 includes two transmission systems in which the first driving force is directly transmitted from the first drive motor M1, that is, a drum transmission system that is a drive transmission system to the photosensitive drum 21. 51 and a development transmission system 52 which is a drive transmission system to the development roller 231. The first drive transmission system 50 includes one-way clutches 5Bk, 5Y, 5C, 5M, a solenoid actuator 52A, a mechanical clutch 52B, and a number of transmission gears.

  The drum transmission system 51 includes a one-way clutch 5Bk assembled to a drum rotation shaft (first rotation shaft) of the first photosensitive drum 21Bk of the first image forming unit 2Bk, and a second photosensitive drum 21Y of the second image forming unit 2Y. A one-way clutch 5Y assembled to the drum rotation shaft (first rotation shaft), a one-way clutch 5C assembled to the drum rotation shaft (first rotation shaft) of the third photosensitive drum 21C of the third image forming unit 2C, and The first driving force is transmitted through the one-way clutch 5M assembled to the drum rotation shaft (first rotation shaft) of the fourth photosensitive drum 21M of the fourth image forming unit 2M. The first photosensitive drum 21Bk, the second photosensitive drum 21Y, the third photosensitive drum 21C, and the fourth photosensitive drum 21M are parallel driven members that are driven when the first driving motor M1 is driven, that is, image formation. Sometimes, all images are rotated regardless of whether the image to be formed is a monochrome image or a color image.

  The development transmission system 52 includes a roller rotation axis (second rotation axis) of the first development roller 231Bk (second rotation body) of the first image forming unit 2Bk, and a second development roller 231Y (second rotation axis) of the second image forming unit 2Y. (Rotary body) roller rotation axis (second rotation axis), third image forming unit 2C third developing roller 231C (second rotation body) roller rotation axis (second rotation axis), and fourth image forming unit 2M. The first driving force is transmitted to the roller rotation shaft (second rotation shaft) of the fourth developing roller 231M (second rotation body).

  The mechanical clutch 52B is mechanically locked and released by the solenoid actuator 52A, whereby the second developing roller 231Y, the third developing roller 231C, and the second developing roller 231Y, which are color yellow, cyan, and magenta developing rollers. 4 is a clutch that switches between a state in which the first driving force is transmitted to the developing roller 231M and a state in which the first driving force is not transmitted. When the image to be formed is a monochrome image, the mechanical clutch 52B separates the second development roller 231Y, the third development roller 231C, and the fourth development roller 231M from the development transmission system 52, and performs the first development that is a black development roller. Only the roller 231Bk is driven to rotate. On the other hand, when a color image is formed, the mechanical clutch 52B connects the second development roller 231Y, the third development roller 231C, and the fourth development roller 231M to the development transmission system 52, and the first development roller 231Bk and the second development roller. All the developing rollers of the roller 231Y, the third developing roller 231C, and the fourth developing roller 231M are rotated.

  According to the first drive transmission system 50, the first photosensitive drum 21Bk, the second photosensitive drum 21Y, the third photosensitive drum 21C, and the fourth photosensitive drum 21M are respectively passed through the drum transmission system 51. The first driving force is directly transmitted from the first motor output shaft M1S of the first driving motor M1. Further, each of the first developing roller 231Bk, the second developing roller 231Y, the third developing roller 231C, and the fourth developing roller 231M is also directly from the first motor output shaft M1S of the first drive motor M1 through the development transmission system 52. The first driving force is transmitted to. Therefore, it is easy to accurately control the rotation of the photosensitive drum 21 and the developing roller 231 by controlling the rotation speed of the first drive motor M1. This contributes to the formation of a good image.

  The second drive transmission system 60 transmits the second drive force generated by the second drive motor M2 to a rotating body that is provided in the main body housing 10 and needs to be driven other than the photosensitive drum 21 and the developing device 23. . Specifically, the second drive transmission system 60 transmits the second drive force to a sheet conveyance system including the intermediate transfer unit 3, the fixing unit 4, the toner container 27, and the paper feeding device 12. The second drive transmission system 60 includes electromagnetic clutches 611, 612, 613, 614, solenoid actuators 621, 622, 63, connection gears 641, 642, and a number of transmission gears.

  The second drive transmission system 60 has two transmission systems in which the second drive force is directly transmitted from the second motor output shaft of the second drive motor M2, that is, the drive of the intermediate transfer unit 3 to the belt drive roller 32. It includes a belt transmission system that is a transmission system and a common transmission system that is a drive transmission system to other units. The shared transmission system includes a first branch transmission system that transmits the second driving force to the fixing roller 41, the pressure roller 42, the paper discharge roller 17, the transport roller 16, and the reverse transport rollers 181 and 182, the registration roller 14, The second driving force is transmitted to the paper feed roller 113, the manual feed system rollers 131, 132, 133, the container feeder 271 and the waste toner feeder 272 that transport toner and waste toner, and the paper feed device 12. Branch transmission system.

  The second driving force is directly transmitted from the second driving motor M2 to the belt driving roller 32 of the belt transmission system. The belt driving roller 32 drives the intermediate transfer belt 31 to rotate. Therefore, the rotation speed control of the second drive motor M2 can make it easy to accurately control the rotation speed of the intermediate transfer belt 31. Further, the photosensitive drum 21 is driven by the first drive motor M1, while the intermediate transfer belt 31 is driven by the second drive motor M2, so that the speeds of both can be controlled separately. These contribute to the formation of a good image.

  A clutch or the like is not particularly incorporated in the transmission system toward the fixing roller 41 of the first branch transmission system, and the second driving force is always transmitted to the fixing roller 41 when the second driving motor M2 is driven. When the pressure roller 42 is pressed against the fixing roller 41, it rotates following the rotation of the fixing roller 41. On the other hand, the pressure roller 42 is provided with an electromagnetic clutch 611 for separating from the fixing roller 41. The electromagnetic clutch 611 operates a cam member that comes into contact with a holding member that rotatably holds the pressure roller 42 to separate the pressure roller 42 from the fixing roller 41. The second driving force is transmitted to the transport roller 16, the paper discharge roller 17, and the reverse transport rollers 181 and 182 via the electromagnetic clutch 612. Each roller is connected to a common transmission system at a predetermined sheet conveyance timing by electromagnetic clutches 611 and 612, and is given a driving force for sheet conveyance.

  A planetary gear mechanism 171 including a sun gear and a planetary gear is assembled in the drive transmission system to the paper discharge roller 17. The solenoid actuator 621 switches the rotation direction of the paper discharge roller 17 by switching the output side of the planetary gear mechanism 171 by rotating the planetary gear around the sun gear. The paper discharge roller 17 is normally driven when discharging the sheet to the paper discharge tray 107, and is reversely driven when the sheet is sent to the reverse conveyance path P2 for duplex printing.

  An electromagnetic clutch 613 is incorporated in the transmission system toward the registration roller 14 of the second branch transmission system. The registration roller 14 is repeatedly rotated and stopped once for correcting the skew of the sheet and feeding the sheet to the secondary transfer unit at a predetermined timing. This drive control is realized by operation control for the electromagnetic clutch 613. .

  An electromagnetic clutch 614 is incorporated in the transmission system directed to the paper feed roller 113 and the transmission system directed to the nip roller 131 of the manual paper feed system, the manual paper feed roller 132, and the three transport rollers 133. These rollers 113, 131, 132, 133 are connected to a common transmission system at a predetermined timing when paper is fed from the paper feed cassette 11 or the manual feed tray 13 by an electromagnetic clutch 614, and have a driving force for feeding sheets. Given. The second branch transmission system is also connected to a lift drive mechanism for the lift plate 112 of the paper feed cassette 11. This elevating drive mechanism can be connected to and disconnected from the common transmission system by a solenoid actuator 622.

  Solenoid actuators 63 are incorporated in the transmission systems of the toner containers 27 of the respective colors toward the container feeder 271. Each solenoid actuator 63 connects the container feeder 271 to the shared transmission system at a timing when toner supply to each color developing device 23 becomes necessary, and disconnects the container feeder 271 from the shared transmission system at other timings. The waste toner feeder 272 is a feeder that is disposed in a waste toner conveyance path (not shown) and conveys waste toner toward a waste toner container (not shown). The waste toner feeder 272 is always connected to a shared transmission system.

  A transmission gear 641 on the main body housing 10 side and a connection gear 642 on the paper feed device 12 side are interposed in the transmission system toward the paper feed device 12 of the second branch transmission system. Both the connecting gears 641 and 642 mesh with each other when the paper feeding device 12 is mounted on the main body housing 10. As a result, the second driving force can be transmitted to the lift plate 122 and the paper feed roller 113 provided in the paper feed device 12.

  FIG. 10 is a plan view showing a gear train that forms a drive transmission path in the first drive transmission system 50 of the drive transmission device 5. Note that the surface shown in FIG. 10 is a surface facing the inside of the main body housing 10.

  In the first drive transmission system 50 of the drive transmission device 5 according to the present embodiment, the gear directly meshed with the first motor output shaft M1S of the first drive motor M1 is a drum drive that is the starting end of the drum transmission system 51. A force receiving portion gear 53 and a development driving force receiving portion gear 54 serving as a starting end of the development transmission system 52. The drum driving force receiving portion gear 53 and the developing driving force receiving portion gear 54 receive the first driving force from the first motor output shaft M1S of the first driving motor M1.

  A first drum drive transmission gear 531 is engaged with the drum drive force receiving portion gear 53, and a second drum drive transmission gear 532 is engaged with the first drum drive transmission gear 531. The first drum drive transmission gear 531 and the second drum drive transmission gear 532 are connected from the drum driving force receiving portion gear 53 to the first drum gear 511Bk, which will be described later, arranged coaxially with the drum rotation shaft of the first photosensitive drum 21Bk. A drive transmission path for transmitting the first driving force is formed.

  A third drum drive transmission gear 533 is engaged with the drum drive force receiving portion gear 53, and a fourth drum drive transmission gear 534 is engaged with the third drum drive transmission gear 533. The third drum drive transmission gear 533 and the fourth drum drive transmission gear 534 are connected to the second drum gear 511Y (described later) arranged coaxially with the drum rotation shaft of the second photosensitive drum 21Y from the drum driving force receiving portion gear 53. A drive transmission path for transmitting the first driving force is formed.

  A fifth drum drive transmission gear 535 is engaged with the third drum drive transmission gear 533 meshed with the drum drive force receiving portion gear 53. The third drum drive transmission gear 533 and the fifth drum drive transmission gear 535 are connected from the drum driving force receiving portion gear 53 to the third drum gear 511C, which will be described later, arranged coaxially with the drum rotation shaft of the third photosensitive drum 21C. A drive transmission path for transmitting the first driving force is formed.

  A sixth drum drive transmission gear 536 is engaged with the first drum drive transmission gear 531 engaged with the drum drive force receiving portion gear 53. The first drum drive transmission gear 531 and the sixth drum drive transmission gear 536 are connected from the drum driving force receiving portion gear 53 to a later-described fourth drum gear 511M arranged coaxially with the drum rotation shaft of the fourth photosensitive drum 21M. A drive transmission path for transmitting the first driving force is formed.

  The gear directly meshed with the development driving force receiving portion gear 54 is a development driving transmission relay gear 55. The development drive transmission relay gear 55 receives the first drive force directly from the development drive force receiving portion gear 54, and transmits the transmitted first drive force to the first development drive transmission gear 541 and the second development drive. Drive transmission in the development transmission system 52 for transmission to the transmission gear 542, the third development drive transmission gear 543, the fourth development drive transmission gear 544, the fifth development drive transmission gear 545, and the sixth development drive transmission gear 546. It functions as a relay point.

  A first development drive transmission gear 541 is engaged with the development drive transmission relay gear 55, and a second development drive transmission gear 542 is engaged with the first development drive transmission gear 541, and this second development drive transmission gear 542 is engaged. The third developing drive transmission gear 543 is engaged with the second developing drive transmission gear 543. The first development drive transmission gear 541, the second development drive transmission gear 542, and the third development drive transmission gear 543 are arranged on a first development gear 521Bk, which will be described later, arranged coaxially with the roller rotation axis of the first development roller 231Bk. A drive transmission path for transmitting the first driving force from the development drive transmission relay gear 55 is formed.

  A fourth development drive transmission gear 544 is meshed with the development drive transmission relay gear 55, and a fifth development drive transmission gear 545 is meshed with the fourth development drive transmission gear 544. A sixth development drive transmission gear 546 is engaged with the gear 545. A fourth development drive transmission gear 544, a fifth development drive transmission gear 545, and a sixth development drive transmission gear 546 are provided on a second development gear 521Y described later disposed coaxially with the roller rotation axis of the second development roller 231Y. A drive transmission path for transmitting the first driving force from the development drive transmission relay gear 55 is formed.

  The fourth development drive transmission gear 544 applies the first drive force from the development drive transmission relay gear 55 to a later-described third development gear 521C arranged coaxially with the roller rotation shaft of the third development roller 231C. A drive transmission path for transmission is formed.

  Further, the first development drive transmission gear 541 applies the first drive force from the development drive transmission relay gear 55 to a later-described fourth development gear 521M arranged coaxially with the roller rotation shaft of the fourth development roller 231M. A drive transmission path for transmission is formed.

  In each of the image forming units 2Bk, 2Y, 2C, and 2M of the image forming apparatus 1 according to the present embodiment, the first photosensitive drum 21Bk, the second photosensitive drum 21Y, the third photosensitive drum 21C, and the fourth photosensitive drum 21M. The first developing roller 231Bk, the second developing roller 231Y, the third developing roller 231C, and the fourth developing roller 231M can be attached to and detached from the main body housing 10. The configuration of the drive transmission device 5 for realizing the mounting and demounting operations of the photosensitive drums 21Bk, 21Y, 21C, and 21M and the developing rollers 231Bk, 231Y, 231C, and 231M with respect to the main body housing 10 are illustrated in FIGS. 21 will be described below.

  FIG. 11 is a perspective view showing the configuration of the first drive transmission system 50 of the drive transmission device 5, and FIG. 12 is a perspective view showing the configuration of the unit structure 500 in the first drive transmission system 50 of the drive transmission device 5. FIG. 13 is a plan view showing the configuration of the unit structure 500.

  The drive transmission device 5 includes a first drive transmission mechanism 56 that transmits the first driving force generated by the first drive motor M1 to the first photosensitive drum 21Bk and the first developing roller 231Bk of the first image forming unit 2Bk. A second drive transmission mechanism 57 configured to transmit the first driving force generated by the first drive motor M1 to the second photosensitive drum 21Y and the second developing roller 231Y of the second image forming unit 2Y; In the present embodiment, in addition to the first drive transmission mechanism 56 and the second drive transmission mechanism 57, the drive transmission device 5 applies the first to the third photosensitive drum 21C and the third developing roller 231C of the third image forming unit 2C. The first drive motor M1 is generated in the third drive transmission mechanism 58 that transmits the first drive force generated by the drive motor M1, and the fourth photosensitive drum 21M and the fourth developing roller 231M of the fourth image forming unit 2M. And a fourth drive transmission mechanism 59 for transmitting the first driving force. The drive transmission device 5 also includes an interlocking member 505 that links the drive transmission operations in the first drive transmission mechanism 56, the second drive transmission mechanism 57, the third drive transmission mechanism 58, and the fourth drive transmission mechanism 59.

  First, the configuration of the first drive transmission mechanism 56 will be described. The first drive transmission mechanism 56 includes a first drum gear 511Bk and a first drum coupling member 512Bk that function as a first drive member, a first drum rotation member 513Bk that functions as a first rotation member, A first drum bushing member 514Bk, a first developing gear 521Bk and a first developing coupling member 522Bk having a function as a second driving member, and a first developing rotating member 523Bk having a function as a second rotating member; The first developing bush member 524Bk and the first link member 501 (link member).

  The first drum gear 511Bk is disposed coaxially with the drum rotation axis L1 of the first photosensitive drum 21Bk. The first drum gear 511Bk receives the first driving force from the drum driving force receiving portion gear 53 directly meshed with the first motor output shaft M1S of the first driving motor M1, and the first drum driving transmission gear 531 and the first drum driving transmission gear 531. Receiving via the two-drum drive transmission gear 532, the first photosensitive drum 21Bk is rotated about the drum rotation axis L1.

  The first drum coupling member 512Bk is disposed coaxially with the drum rotation axis L1 of the first photosensitive drum 21Bk. The first drum coupling member 512Bk is disposed closer to the first photosensitive drum 21Bk than the first drum gear 511Bk in the axial direction of the drum rotation axis L1. The first drum coupling member 512Bk can be connected to and separated from the first photosensitive drum 21Bk in the axial direction of the drum rotation axis L1. The first photosensitive drum 21Bk rotates the drum by transmitting the first driving force from the first motor output shaft M1S via the first drum gear 511Bk in a state where the first drum coupling member 512Bk is connected. It rotates around the axis L1. Further, the first photosensitive drum 21Bk is in a state in which the first driving force from the first motor output shaft M1S is not transmitted with the first drum coupling member 512Bk separated, and is detached from the main body housing 10. It becomes possible.

  FIG. 14 is a view for explaining the rotation operation of the first drum rotation member 513Bk and the first developing rotation member 523Bk provided in the first drive transmission mechanism 56 constituting the first drive transmission system 50. 14A shows a state where the first drum rotating member 513Bk and the first developing rotating member 523Bk have reached the rotation end position in the normal rotation direction, and FIG. 14B shows the first drum rotating member. FIG. 14C shows a state where 513Bk and the first developing rotation member 523Bk have reached the rotation intermediate position, and FIG. 14C illustrates the rotation of the first drum rotation member 513Bk and the first development rotation member 523Bk in the reverse rotation direction. Indicates that the end position has been reached.

  The first drum rotating member 513Bk is disposed coaxially with the drum rotation axis L1 of the first photosensitive drum 21Bk. The first drum rotation member 513Bk is formed in an annular shape, and has a drum rotation engagement portion 513a (first engagement portion) protruding outward in the radial direction at a part of the outer peripheral edge. The first drum bush member 514Bk is inserted coaxially with the drum rotation axis L1 of the first photosensitive drum 21Bk between the first drum gear 511Bk and the first drum coupling member 512Bk.

  The first drum rotating member 513Bk rotates in the positive rotation direction around the drum rotation axis L1, so that the first drum bush member 514Bk approaches the first photosensitive drum 21Bk in the axial direction of the drum rotation axis L1. Move to. The first drum coupling member 512Bk moves in a direction approaching the first photosensitive drum 21Bk in accordance with the movement operation of the first drum bushing member 514Bk due to the rotation operation of the first drum rotation member 513Bk in the forward rotation direction. As a result, the first drum coupling member 512Bk is coupled to the first photosensitive drum 21Bk. That is, the first drum rotation member 513Bk rotates in the positive rotation direction around the drum rotation axis L1, thereby connecting the first drum coupling member 512Bk to the first photosensitive drum 21Bk.

  Further, the first drum rotation member 513Bk rotates in the reverse rotation direction opposite to the normal rotation direction around the drum rotation axis L1, so that the first drum bush member 514Bk in the axial direction of the drum rotation axis L1. Is moved away from the first photosensitive drum 21Bk. The first drum coupling member 512Bk moves away from the first photosensitive drum 21Bk in accordance with the movement operation of the first drum bushing member 514Bk by the rotation operation of the first drum rotation member 513Bk in the reverse rotation direction. As a result, the first drum coupling member 512Bk is separated from the first photosensitive drum 21Bk. That is, the first drum rotation member 513Bk rotates in the reverse rotation direction around the drum rotation axis L1, thereby separating the first drum coupling member 512Bk from the first photosensitive drum 21Bk.

  The first drive transmission mechanism 56 is not necessarily configured to include the first drum bushing member 514Bk, and the first drum coupling member 512Bk is moved to the first photosensitive member by the rotation operation of the first drum rotation member 513Bk. What is necessary is just to be comprised so that it may be connected and separated with respect to the body drum 21Bk.

  The first developing gear 521Bk is disposed coaxially with the roller rotation axis L2 of the first developing roller 231Bk, which is parallel to the drum rotation axis L1 of the first photosensitive drum 21Bk. The first developing gear 521Bk receives the first driving force from the developing driving force receiving portion gear 54 directly meshed with the first motor output shaft M1S of the first driving motor M1, the developing driving transmission relay gear 55, The first developing roller 231 </ b> Bk is rotated around the roller rotation axis L <b> 2 by receiving it through the first developing drive transmission gear 541, the second development driving transmission gear 542, and the third development driving transmission gear 543.

  The first developing coupling member 522Bk is disposed coaxially with the roller rotation axis L2 of the first developing roller 231Bk. The first development coupling member 522Bk is disposed closer to the first development roller 231Bk than the first development gear 521Bk in the axial direction of the roller rotation axis L2. The first developing coupling member 522Bk can be connected to and separated from the first developing roller 231Bk in the axial direction of the roller rotation axis L2. The first developing roller 231Bk rotates the roller by transmitting the first driving force from the first motor output shaft M1S via the first developing gear 521Bk in a state where the first developing coupling member 522Bk is connected. It rotates around the axis L2. Further, the first developing roller 231Bk is in a state where the first driving force from the first motor output shaft M1S is not transmitted with the first developing coupling member 522Bk being separated, and can be detached from the main body housing 10. It becomes.

  The first developing rotation member 523Bk is disposed coaxially with the roller rotation axis L2 of the first developing roller 231Bk. The first developing rotation member 523Bk is formed in an annular shape, and has a developing rotation engagement portion 523a (second engagement portion) protruding outward in the radial direction at a part of the outer peripheral edge. The first developing bush member 524Bk is inserted coaxially with the roller rotation axis L2 of the first developing roller 231Bk between the first developing gear 521Bk and the first developing coupling member 522Bk.

  The first developing rotation member 523Bk rotates in the positive rotation direction around the roller rotation axis L2, so that the first developing bush member 524Bk approaches the first development roller 231Bk in the axial direction of the roller rotation axis L2. Move. The first developing coupling member 522Bk moves in a direction approaching the first developing roller 231Bk according to the moving operation of the first developing bush member 524Bk by the rotating operation of the first developing rotating member 523Bk in the positive rotating direction. As a result, the first developing coupling member 522Bk is coupled to the first developing roller 231Bk. That is, the first developing rotation member 523Bk rotates in the positive rotation direction around the roller rotation axis L2, thereby connecting the first development coupling member 522Bk to the first development roller 231Bk.

  Further, the first developing rotation member 523Bk rotates in the reverse rotation direction opposite to the normal rotation direction around the roller rotation axis L2, so that the first developing bush member 524Bk in the axial direction of the roller rotation axis L2. Is moved away from the first developing roller 231Bk. The first developing coupling member 522Bk moves away from the first developing roller 231Bk according to the moving operation of the first developing bush member 524Bk by the rotating operation of the first developing rotating member 523Bk in the reverse rotating direction, As a result, the first developing coupling member 522Bk is separated from the first developing roller 231Bk. That is, the first developing rotating member 523Bk rotates in the reverse rotating direction around the roller rotation axis L2, thereby separating the first developing coupling member 522Bk from the first developing roller 231Bk.

  The first drive transmission mechanism 56 is not necessarily configured to include the first developing bush member 524Bk, and the first developing coupling member 522Bk is moved to the first developing member by the rotating operation of the first developing rotating member 523Bk. What is necessary is just to be comprised so that it may be connected and spaced apart with respect to roller 231Bk.

  The first link member 501 is formed in a plate shape, and is connected to the drum rotation engagement portion 513a of the first drum rotation member 513Bk, and the first developing operation. And a second link connecting portion 501C (second connecting portion) connected to the developing rotation engaging portion 523a of the moving member 523Bk. The first link member 501 is bridged between the drum rotation engagement portion 513a of the first drum rotation member 513Bk and the development rotation engagement portion 523a of the first development rotation member 523Bk. The first link member 501 is a surface facing the first photosensitive drum 21Bk and the first developing roller 231Bk in a state of being spanned between the drum rotation engagement portion 513a and the development rotation engagement portion 523a. The first link protrusion 501A has a columnar shape. The first link member 501 configured in this manner swings along one plane perpendicular to the drum rotation axis L1 and the roller rotation axis L2, thereby rotating the first drum rotation member 513Bk and the first link member 501. The rotation operation of the developing rotation member 523Bk is interlocked.

  Next, the configuration of the second drive transmission mechanism 57 will be described. The second drive transmission mechanism 57 includes a second drum gear 511Y and a second drum coupling member 512Y having a function as a first drive member, a second drum rotating member 513Y having a function as a first rotating member, A second drum bushing member 514Y, a second developing gear 521Y and a second developing coupling member 522Y having a function as a second driving member, and a second developing rotating member 523Y having a function as a second rotating member; The second developing bushing member 524Y and the second link member 502 (link member) are included.

  The second drum gear 511Y is disposed on the same axis as the drum rotation axis L3 of the second photoconductor drum 21Y and parallel to the drum rotation axis L1 of the first photoconductor drum 21Bk. The second drum gear 511Y transmits the first driving force from the drum driving force receiving portion gear 53 directly meshed with the first motor output shaft M1S of the first driving motor M1 to the third drum driving transmission gear 533 and the first drum driving transmission gear 533. Receiving via the four-drum drive transmission gear 534, the second photosensitive drum 21Y is rotated about the drum rotation axis L3.

  The second drum coupling member 512Y is disposed coaxially with the drum rotation axis L3 of the second photosensitive drum 21Y. The second drum coupling member 512Y is disposed closer to the second photosensitive drum 21Y than the second drum gear 511Y in the axial direction of the drum rotation axis L3. The second drum coupling member 512Y can be connected to and separated from the second photosensitive drum 21Y in the axial direction of the drum rotation axis L3. The second photosensitive drum 21Y rotates the drum when the first driving force from the first motor output shaft M1S is transmitted through the second drum gear 511Y in a state where the second drum coupling member 512Y is connected. It rotates around the axis L3. Further, the second photosensitive drum 21Y is in a state in which the first driving force from the first motor output shaft M1S is not transmitted when the second drum coupling member 512Y is separated, and is detached from the main body housing 10. It becomes possible.

  The second drum rotating member 513Y is disposed coaxially with the drum rotation axis L3 of the second photosensitive drum 21Y. The second drum rotation member 513Y is formed in an annular shape, and has a drum rotation engagement portion 513a (first engagement portion) protruding outward in the radial direction at a part of the outer peripheral edge. The second drum bushing member 514Y is inserted between the second drum gear 511Y and the second drum coupling member 512Y coaxially with the drum rotation axis L3 of the second photosensitive drum 21Y.

  The second drum rotating member 513Y rotates in the positive rotation direction around the drum rotation axis L3, so that the second drum bushing member 514Y approaches the second photosensitive drum 21Y in the axial direction of the drum rotation axis L3. Move to. The second drum coupling member 512Y moves in a direction approaching the second photosensitive drum 21Y in accordance with the movement operation of the second drum bushing member 514Y by the rotation operation of the second drum rotation member 513Y in the normal rotation direction. As a result, the second drum coupling member 512Y is connected to the second photosensitive drum 21Y. That is, the second drum rotating member 513Y rotates in the positive rotation direction around the drum rotation axis L3, thereby connecting the second drum coupling member 512Y to the second photosensitive drum 21Y.

  Further, the second drum rotating member 513Y rotates in the reverse rotation direction opposite to the normal rotation direction around the drum rotation axis L3, so that the second drum bushing member 514Y in the axial direction of the drum rotation axis L3. Is moved away from the second photosensitive drum 21Y. The second drum coupling member 512Y moves away from the second photosensitive drum 21Y in accordance with the movement operation of the second drum bushing member 514Y due to the rotation operation of the second drum rotation member 513Y in the reverse rotation direction. As a result, the second drum coupling member 512Y is separated from the second photosensitive drum 21Y. That is, the second drum rotation member 513Y rotates in the reverse rotation direction around the drum rotation axis L3, thereby separating the second drum coupling member 512Y from the second photosensitive drum 21Y.

  The second drive transmission mechanism 57 is not necessarily configured to include the second drum bushing member 514Y, and the second drum coupling member 512Y is moved to the second photosensitive state by the rotation of the second drum rotation member 513Y. What is necessary is just to be comprised so that it may be connected and separated with respect to the body drum 21Y.

  The second developing gear 521Y is disposed on the same axis as the roller rotation axis L4 of the second developing roller 231Y and parallel to the drum rotation axis L3 of the second photosensitive drum 21Y. The second developing gear 521Y receives the first driving force from the developing driving force receiving portion gear 54 directly meshed with the first motor output shaft M1S of the first driving motor M1, the developing driving transmission relay gear 55, The second developing roller 231 </ b> Y is rotated around the roller rotation axis L <b> 4 in response to the fourth developing drive transmission gear 544, the fifth development drive transmission gear 545, and the sixth development drive transmission gear 546.

  The second developing coupling member 522Y is disposed coaxially with the roller rotation axis L4 of the second developing roller 231Y. The second developing coupling member 522Y is disposed closer to the second developing roller 231Y than the second developing gear 521Y in the axial direction of the roller rotation axis L4. The second developing coupling member 522Y can be connected to and separated from the second developing roller 231Y in the axial direction of the roller rotation axis L4. The second developing roller 231Y rotates the roller by transmitting the first driving force from the first motor output shaft M1S via the second developing gear 521Y in a state where the second developing coupling member 522Y is connected. Rotate around axis L4. The second developing roller 231Y is in a state in which the first driving force from the first motor output shaft M1S is not transmitted when the second developing coupling member 522Y is separated, and can be detached from the main body housing 10. It becomes.

  The second developing rotation member 523Y is disposed coaxially with the roller rotation axis L4 of the second developing roller 231Y. The second developing rotation member 523Y is formed in an annular shape, and has a developing rotation engaging portion 523a (second engaging portion) protruding outward in the radial direction at a part of the outer peripheral edge. The second developing bush member 524Y is fitted coaxially with the roller rotation axis L4 of the second developing roller 231Y between the second developing gear 521Y and the second developing coupling member 522Y.

  The second developing rotation member 523Y rotates in the positive rotation direction around the roller rotation axis L4, so that the second development bush member 524Y approaches the second development roller 231Y in the axial direction of the roller rotation axis L4. Move. The second developing coupling member 522Y moves in a direction approaching the second developing roller 231Y in accordance with the moving operation of the second developing bush member 524Y by the rotating operation of the second developing rotating member 523Y in the normal rotating direction. As a result, the second developing coupling member 522Y is connected to the second developing roller 231Y. That is, the second developing rotation member 523Y rotates in the positive rotation direction around the roller rotation axis L4, thereby connecting the second developing coupling member 522Y to the second developing roller 231Y.

  Further, the second developing rotation member 523Y rotates in the reverse rotation direction opposite to the normal rotation direction around the roller rotation axis L4, so that the second development bush member 524Y in the axial direction of the roller rotation axis L4. Is moved away from the second developing roller 231Y. The second developing coupling member 522Y moves away from the second developing roller 231Y according to the moving operation of the second developing bush member 524Y by the rotating operation of the second developing rotating member 523Y in the reverse rotating direction, As a result, the second developing coupling member 522Y is separated from the second developing roller 231Y. That is, the second developing rotating member 523Y rotates in the reverse rotating direction around the roller rotation axis L4, thereby separating the second developing coupling member 522Y from the second developing roller 231Y.

  Note that the second drive transmission mechanism 57 is not necessarily configured to include the second developing bush member 524Y, and the second developing coupling member 522Y causes the second developing to be performed by the rotating operation of the second developing rotating member 523Y. What is necessary is just to be comprised so that it may be connected and spaced apart with respect to the roller 231Y.

  The second link member 502 is formed in a plate shape, and is connected to the first link connection portion 502B (first connection portion) connected to the drum rotation engagement portion 513a of the second drum rotation member 513Y. A second link connecting portion 502C (second connecting portion) connected to the developing rotation engaging portion 523a of the moving member 523Y. The second link member 502 is bridged between the drum rotation engagement portion 513a of the second drum rotation member 513Y and the development rotation engagement portion 523a of the second development rotation member 523Y. The second link member 502 is a surface facing the second photosensitive drum 21Y and the second developing roller 231Y in a state of being spanned between the drum rotation engaging portion 513a and the development rotation engaging portion 523a. The cylindrical second link protrusion 502A is provided. The second link member 502 configured in this manner swings along one plane perpendicular to the drum rotation axis L3 and the roller rotation axis L4, thereby causing the second drum rotation member 513Y to rotate and The rotation operation of the developing rotation member 523Y is interlocked.

  Next, the configuration of the third drive transmission mechanism 58 will be described. The third drive transmission mechanism 58 includes a third drum gear 511C and a third drum coupling member 512C having a function as a first drive member, a third drum rotating member 513C having a function as a first rotating member, A third drum bushing member 514C, a third developing gear 521C and a third developing coupling member 522C having a function as a second driving member, and a third developing rotating member 523C having a function as a second rotating member; The third developing bushing member 524C and the third link member 503 (link member) are included.

  The third drum gear 511C is disposed coaxially with the drum rotation axis L5 of the third photoconductor drum 21C and parallel to the drum rotation axis L1 of the first photoconductor drum 21Bk. The third drum gear 511C receives the first driving force from the drum driving force receiving portion gear 53 directly meshed with the first motor output shaft M1S of the first driving motor M1, and the third drum driving transmission gear 533 and the first drum driving transmission gear 533. Receiving via the 5-drum drive transmission gear 535, the third photosensitive drum 21C is rotated about the drum rotation axis L5.

  The third drum coupling member 512C is disposed coaxially with the drum rotation axis L5 of the third photosensitive drum 21C. The third drum coupling member 512C is disposed closer to the third photosensitive drum 21C than the third drum gear 511C in the axial direction of the drum rotation axis L5. The third drum coupling member 512C can be connected to and separated from the third photosensitive drum 21C in the axial direction of the drum rotation axis L5. The third photoconductor drum 21C rotates the drum by transmitting the first driving force from the first motor output shaft M1S via the third drum gear 511C in a state where the third drum coupling member 512C is connected. Rotate around axis L5. Further, the third photosensitive drum 21 </ b> C is in a state where the first driving force from the first motor output shaft M <b> 1 </ b> S is not transmitted when the third drum coupling member 512 </ b> C is separated from the main body housing 10. It becomes possible.

  The third drum rotating member 513C is disposed coaxially with the drum rotation axis L5 of the third photosensitive drum 21C. The third drum rotation member 513C is formed in an annular shape, and has a drum rotation engagement portion 513a (first engagement portion) protruding outward in the radial direction at a part of the outer peripheral edge. The third drum bushing member 514C is inserted between the third drum gear 511C and the third drum coupling member 512C on the same axis as the drum rotation axis L5 of the third photosensitive drum 21C.

  The third drum rotating member 513C rotates in the positive rotation direction around the drum rotation axis L5, so that the third drum bushing member 514C approaches the third photosensitive drum 21C in the axial direction of the drum rotation axis L5. Move to. The third drum coupling member 512C moves in a direction approaching the third photosensitive drum 21C in accordance with the moving operation of the third drum bushing member 514C due to the rotating operation of the third drum rotating member 513C in the normal rotating direction. As a result, the third drum coupling member 512C is connected to the third photosensitive drum 21C. That is, the third drum rotating member 513C rotates in the positive rotation direction around the drum rotation axis L5, thereby connecting the third drum coupling member 512C to the third photosensitive drum 21C.

  Further, the third drum rotation member 513C rotates in the reverse rotation direction opposite to the normal rotation direction around the drum rotation axis L5, so that the third drum bush member 514C in the axial direction of the drum rotation axis L5. Is moved away from the third photosensitive drum 21C. The third drum coupling member 512C moves away from the third photosensitive drum 21C in response to the movement of the third drum bushing member 514C due to the rotation of the third drum rotation member 513C in the reverse rotation direction. As a result, the third drum coupling member 512C is separated from the third photosensitive drum 21C. That is, the third drum rotating member 513C rotates in the reverse rotating direction around the drum rotation axis L5, thereby separating the third drum coupling member 512C from the third photosensitive drum 21C.

  Note that the third drive transmission mechanism 58 is not necessarily configured to include the third drum bushing member 514C, and the third drum coupling member 512C is moved to the third photosensitive state by the rotation of the third drum rotation member 513C. What is necessary is just to be comprised so that it may be connected and separated with respect to the body drum 21C.

  The third developing gear 521C is disposed coaxially with the roller rotation axis L6 of the third developing roller 231C and parallel to the drum rotation axis L5 of the third photosensitive drum 21C. The third developing gear 521C transmits the first driving force from the developing driving force receiving portion gear 54 directly meshed with the first motor output shaft M1S of the first driving motor M1 to the developing driving transmission relay gear 55 and the first driving gear M1S. The third developing roller 231 </ b> C is rotated around the roller rotation axis L <b> 6 by receiving it through the four developing drive transmission gear 544.

  The third developing coupling member 522C is disposed coaxially with the roller rotation axis L6 of the third developing roller 231C. The third development coupling member 522C is disposed closer to the third development roller 231C than the third development gear 521C in the axial direction of the roller rotation axis L6. The third developing coupling member 522C can be connected to and separated from the third developing roller 231C in the axial direction of the roller rotation axis L6. The third developing roller 231C rotates the roller by transmitting the first driving force from the first motor output shaft M1S via the third developing gear 521C in a state where the third developing coupling member 522C is connected. It rotates around the axis L6. The third developing roller 231C is in a state in which the first driving force from the first motor output shaft M1S is not transmitted when the third developing coupling member 522C is separated, and can be detached from the main body housing 10. It becomes.

  The third developing rotation member 523C is disposed coaxially with the roller rotation axis L6 of the third developing roller 231C. The third developing rotation member 523C is formed in an annular shape, and has a developing rotation engaging portion 523a (second engaging portion) protruding outward in the radial direction at a part of the outer peripheral edge. The third developing bush member 524C is inserted between the third developing gear 521C and the third developing coupling member 522C on the same axis as the roller rotation axis L6 of the third developing roller 231C.

  The third developing rotation member 523C rotates in the positive rotation direction around the roller rotation axis L6, so that the third developing bush member 524C approaches the third development roller 231C in the axial direction of the roller rotation axis L6. Move. The third developing coupling member 522C moves in a direction approaching the third developing roller 231C in accordance with the moving operation of the third developing bushing member 524C by the rotating operation of the third developing rotating member 523C in the normal rotating direction. As a result, the third developing coupling member 522C is connected to the third developing roller 231C. That is, the third developing rotation member 523C rotates in the positive rotation direction around the roller rotation axis L6, thereby connecting the third developing coupling member 522C to the third developing roller 231C.

  Further, the third developing rotation member 523C rotates in the reverse rotation direction opposite to the normal rotation direction around the roller rotation axis L6, so that the third development bush member 524C in the axial direction of the roller rotation axis L6. Is moved away from the third developing roller 231C. The third developing coupling member 522C moves away from the third developing roller 231C in accordance with the moving operation of the third developing bush member 524C by the rotating operation of the third developing rotating member 523C in the reverse rotating direction. As a result, the third developing coupling member 522C is separated from the third developing roller 231C. In other words, the third developing rotating member 523C rotates in the reverse rotating direction around the roller rotation axis L6, thereby separating the third developing coupling member 522C from the third developing roller 231C.

  Note that the third drive transmission mechanism 58 is not necessarily configured to include the third developing bush member 524C, and the third developing coupling member 522C is moved to the third developing member by the rotating operation of the third developing rotating member 523C. What is necessary is just to be comprised so that it may be connected and spaced apart with respect to the roller 231C.

  The third link member 503 is formed in a plate shape, and is connected to the first link connection portion 503B (first connection portion) connected to the drum rotation engagement portion 513a of the third drum rotation member 513C, and the third developing operation. And a second link connecting portion 503C (second connecting portion) connected to the developing rotation engaging portion 523a of the moving member 523C. The third link member 503 is bridged between the drum rotation engagement portion 513a of the third drum rotation member 513C and the development rotation engagement portion 523a of the third development rotation member 523C. The third link member 503 is a surface facing the third photosensitive drum 21C and the third developing roller 231C in a state of being spanned between the drum rotation engaging portion 513a and the development rotation engaging portion 523a. The cylindrical third link protrusion 503A is provided. The third link member 503 configured in this manner swings along one plane perpendicular to the drum rotation axis L5 and the roller rotation axis L6, thereby rotating the third drum rotation member 513C and the third link member 503C. The rotation operation of the developing rotation member 523C is interlocked.

  Next, the configuration of the fourth drive transmission mechanism 59 will be described. The fourth drive transmission mechanism 59 includes a fourth drum gear 511M and a fourth drum coupling member 512M having a function as a first drive member, a fourth drum rotating member 513M having a function as a first rotating member, A fourth drum bushing member 514M, a fourth developing gear 521M and a fourth developing coupling member 522M that function as a second driving member, and a fourth developing rotating member 523M that functions as a second rotating member; The fourth developing bush member 524M and the fourth link member 504 (link member).

  The fourth drum gear 511M is disposed on the same axis as the drum rotation axis L7 of the fourth photoconductor drum 21M and parallel to the drum rotation axis L1 of the first photoconductor drum 21Bk. The fourth drum gear 511M receives the first driving force from the drum driving force receiving portion gear 53 directly meshed with the first motor output shaft M1S of the first driving motor M1, and the first drum driving transmission gear 531 and the first drum driving transmission gear 531. Receiving via the 6-drum drive transmission gear 536, the fourth photosensitive drum 21M is rotated about the drum rotation axis L7.

  The fourth drum coupling member 512M is disposed coaxially with the drum rotation axis L7 of the fourth photosensitive drum 21M. The fourth drum coupling member 512M is disposed closer to the fourth photosensitive drum 21M than the fourth drum gear 511M in the axial direction of the drum rotation shaft L7. The fourth drum coupling member 512M can be connected to and separated from the fourth photosensitive drum 21M in the axial direction of the drum rotation axis L7. The fourth photoconductor drum 21M rotates the drum by transmitting the first driving force from the first motor output shaft M1S via the fourth drum gear 511M in a state where the fourth drum coupling member 512M is connected. Rotate around axis L7. The fourth photosensitive drum 21M is in a state in which the first driving force from the first motor output shaft M1S is not transmitted when the fourth drum coupling member 512M is separated, and is detached from the main body housing 10. It becomes possible.

  The fourth drum rotating member 513M is disposed coaxially with the drum rotation axis L7 of the fourth photosensitive drum 21M. The fourth drum rotation member 513M is formed in an annular shape, and has a drum rotation engagement portion 513a (first engagement portion) protruding outward in the radial direction at a part of the outer peripheral edge. The fourth drum bushing member 514M is inserted between the fourth drum gear 511M and the fourth drum coupling member 512M on the same axis as the drum rotation axis L7 of the fourth photosensitive drum 21M.

  The fourth drum rotating member 513M rotates in the positive rotation direction around the drum rotation axis L7, so that the fourth drum bushing member 514M approaches the fourth photosensitive drum 21M in the axial direction of the drum rotation axis L7. Move to. The fourth drum coupling member 512M moves in the direction approaching the fourth photoconductor drum 21M in accordance with the moving operation of the fourth drum bushing member 514M by the rotating operation of the fourth drum rotating member 513M in the forward rotation direction. As a result, the fourth drum coupling member 512M is coupled to the fourth photosensitive drum 21M. That is, the fourth drum rotating member 513M rotates in the positive rotation direction around the drum rotation axis L7, thereby connecting the fourth drum coupling member 512M to the fourth photoconductor drum 21M.

  Further, the fourth drum rotation member 513M rotates in the reverse rotation direction opposite to the normal rotation direction around the drum rotation axis L7, so that the fourth drum bush member 514M in the axial direction of the drum rotation axis L7. Is moved away from the fourth photosensitive drum 21M. The fourth drum coupling member 512M moves away from the fourth photosensitive drum 21M in accordance with the moving operation of the fourth drum bushing member 514M due to the rotating operation of the fourth drum rotating member 513M in the reverse rotation direction. As a result, the fourth drum coupling member 512M is separated from the fourth photosensitive drum 21M. That is, the fourth drum rotation member 513M rotates in the reverse rotation direction around the drum rotation axis L7, thereby separating the fourth drum coupling member 512M from the fourth photoconductor drum 21M.

  Note that the fourth drive transmission mechanism 59 is not necessarily provided with the fourth drum bushing member 514M, and the fourth drum coupling member 512M is moved to the fourth photosensitive state by the turning operation of the fourth drum turning member 513M. What is necessary is just to be comprised so that it may be connected and separated with respect to the body drum 21M.

  The fourth developing gear 521M is disposed coaxially with the roller rotation axis L8 of the fourth developing roller 231M, which is parallel to the drum rotation axis L7 of the fourth photosensitive drum 21M. The fourth developing gear 521M transmits the first driving force from the developing driving force receiving portion gear 54 directly meshed with the first motor output shaft M1S of the first driving motor M1 to the developing driving transmission relay gear 55 and the first driving gear M1S. The first developing drive transmission gear 541 is received to rotate the fourth developing roller 231M around the roller rotation axis L8.

  The fourth developing coupling member 522M is disposed coaxially with the roller rotation axis L8 of the fourth developing roller 231M. The fourth developing coupling member 522M is disposed closer to the fourth developing roller 231M than the fourth developing gear 521M in the axial direction of the roller rotation axis L8. The fourth developing coupling member 522M can be connected to and separated from the fourth developing roller 231M in the axial direction of the roller rotation axis L8. The fourth developing roller 231M rotates the roller by transmitting the first driving force from the first motor output shaft M1S via the fourth developing gear 521M in a state where the fourth developing coupling member 522M is connected. Rotate around axis L8. The fourth developing roller 231M is in a state in which the first driving force from the first motor output shaft M1S is not transmitted when the fourth developing coupling member 522M is separated, and can be detached from the main body housing 10. It becomes.

  The fourth developing rotation member 523M is disposed coaxially with the roller rotation axis L8 of the fourth developing roller 231M. The fourth developing rotating member 523M is formed in an annular shape, and has a developing rotating engaging portion 523a (second engaging portion) protruding outward in the radial direction at a part of the outer peripheral edge. The fourth developing bush member 524M is fitted coaxially with the roller rotation axis L8 of the fourth developing roller 231M between the fourth developing gear 521M and the fourth developing coupling member 522M.

  The fourth developing rotation member 523M rotates in the positive rotation direction around the roller rotation axis L8, so that the fourth development bush member 524M approaches the fourth development roller 231M in the axial direction of the roller rotation axis L8. Move. The fourth developing coupling member 522M moves in the direction approaching the fourth developing roller 231M in accordance with the moving operation of the fourth developing bush member 524M by the rotating operation of the fourth developing rotating member 523M in the normal rotating direction. As a result, the fourth developing coupling member 522M is connected to the fourth developing roller 231M. That is, the fourth developing rotation member 523M rotates in the positive rotation direction around the roller rotation axis L8, thereby connecting the fourth development coupling member 522M to the fourth development roller 231M.

  Further, the fourth developing rotation member 523M rotates in the reverse rotation direction opposite to the normal rotation direction around the roller rotation axis L8, so that the fourth development bush member 524M in the axial direction of the roller rotation axis L8. Is moved away from the fourth developing roller 231M. The fourth developing coupling member 522M moves away from the fourth developing roller 231M according to the moving operation of the fourth developing bush member 524M by the rotating operation of the fourth developing rotating member 523M in the reverse rotating direction, As a result, the fourth developing coupling member 522M is separated from the fourth developing roller 231M. That is, the fourth developing rotating member 523M rotates in the reverse rotating direction around the roller rotation axis L8, thereby separating the fourth developing coupling member 522M from the fourth developing roller 231M.

  Note that the fourth drive transmission mechanism 59 is not necessarily configured to include the fourth developing bush member 524M, and the fourth developing coupling member 522M causes the fourth developing to be performed by the rotating operation of the fourth developing rotating member 523M. What is necessary is just to be comprised so that it may be connected and spaced apart with respect to the roller 231M.

  The fourth link member 504 is formed in a plate shape, and is connected to the drum rotation engagement portion 513a of the fourth drum rotation member 513M, and the fourth developing operation. And a second link connecting portion 504C (second connecting portion) connected to the developing rotation engaging portion 523a of the moving member 523M. The fourth link member 504 is bridged between the drum rotation engagement portion 513a of the fourth drum rotation member 513M and the development rotation engagement portion 523a of the fourth development rotation member 523M. The fourth link member 504 is a surface facing the fourth photosensitive drum 21M and the fourth developing roller 231M in a state of being spanned between the drum rotation engaging portion 513a and the development rotation engaging portion 523a. In addition, a cylindrical fourth link protrusion 504A is provided. The fourth link member 504 configured in this manner swings along a fourth plane (one plane perpendicular to the drum rotation axis L7 and the roller rotation axis L8) that is coplanar with the first plane, The rotation operation of the fourth drum rotation member 513M and the rotation operation of the fourth development rotation member 523M are interlocked.

  Next, the configuration of the interlocking member 505 will be described. The interlocking member 505 is formed in a long plate shape extending perpendicularly to the drum rotation axis L1 of the first photosensitive drum 21Bk, and has a gripping portion 505A provided at one end in the longitudinal direction and four insertion holes penetrating in the thickness direction. 505B. The interlocking member 505 includes a first link protrusion 501A of the first link member 501, a second link protrusion 502A of the second link member 502, a third link protrusion 503A of the third link member 503, and a fourth link member 504. The fourth link protrusions 504A are connected to the first link member 501, the second link member 502, the third link member 503, and the fourth link member 504 by being inserted through the insertion holes 505B, respectively. Further, the interlocking member 505 is configured such that the first link protrusion 501A, the second link protrusion 502A, the third link protrusion 503A, and the fourth link protrusion 504A are detached from the insertion hole 505B, whereby the first link member 501 is connected. The connection to the second link member 502, the third link member 503, and the fourth link member 504 is released. That is, the interlocking member 505 is detachably connected to the first link member 501, the second link member 502, the third link member 503, and the fourth link member 504 through the insertion hole 505B.

  The interlocking member 505 configured as described above is connected to the first link member 501, the second link member 502, the third link member 503, and the fourth link member 504, and the grip portion 505A is gripped. The first link member 501, the second link member 502, and the third link are moved along a predetermined direction parallel to the one plane perpendicular to the drum rotation axis of the photosensitive drum and the roller rotation axis of each developing roller. The swinging motions of the member 503 and the fourth link member 504 are interlocked.

  In the drive transmission device 5 according to the present embodiment, the connection and separation operation of the drum coupling member with respect to the photosensitive drum and the connection and separation operation of the development coupling member with respect to the developing roller according to the movement operation of the interlocking member 505. This will be described with reference to FIGS.

  FIG. 15 shows the connecting operation of the drum coupling members 512Bk, 512Y, 512C, and 512M to the photosensitive drums 21Bk, 21Y, 21C, and 21M in the first drive transmission system 50 of the drive transmission device 5, and the developing rollers. FIG. 10 is a diagram for explaining a connecting operation of developing coupling members 522Bk, 522Y, 522C, and 522M with respect to 231Bk, 231Y, 231C, and 231M. FIG. 15A is a plan view, FIG. 15B is a view seen from above, and FIG. 15C illustrates the first drive transmission mechanism 56. FIG. 16 is a view for explaining the connecting operation of the first drum coupling member 512Bk to the first photosensitive drum 21Bk in the first drive transmission system 50 of the drive transmission device 5. FIG. 16A shows a perspective view, and FIG. 16B shows a cross-sectional view.

  When the interlocking member 505 moves in the direction of the arrow A1 in FIG. 15, the first link member 501 of the first drive transmission mechanism 56 and the second link of the second drive transmission mechanism 57 are interlocked with the movement operation of the interlocking member 505. The swinging operation of the member 502, the third link member 503 of the third drive transmission mechanism 58, and the fourth link member 504 of the fourth drive transmission mechanism 59 is executed.

  When the swinging operation of the first link member 501 is performed in conjunction with the movement operation of the interlocking member 505 in the arrow A1 direction, the first drum rotating member 513Bk and the first developing operation are interlocked with the swinging operation. A rotation operation of the moving member 523Bk in the normal rotation direction is executed. Further, when the first drum rotation member 513Bk and the first developing rotation member 523Bk are rotated in the normal rotation direction, the first drum rotation member 513Bk and the first development rotation member 523Bk are biased by the spring member 506 in accordance with the rotation operations. The connecting operation of the first drum coupling member 512Bk to the first photosensitive drum 21Bk and the connecting operation of the first developing coupling member 522Bk biased by a spring member (not shown) to the first developing roller 231Bk are executed. .

  When the swinging operation of the second link member 502 is performed in conjunction with the movement operation of the interlocking member 505 in the arrow A1 direction, the second drum rotating member 513Y and the second developing operation are interlocked with the swinging operation. A rotation operation of the moving member 523Y in the normal rotation direction is executed. Further, when the second drum rotating member 513Y and the second developing rotating member 523Y are rotated in the forward rotation direction, the second drum rotating member 513Y and the second developing rotating member 523Y are biased by a spring member (not shown) in accordance with the rotating operations. The connecting operation of the second drum coupling member 512Y to the second photosensitive drum 21Y and the connecting operation of the second developing coupling member 522Y biased by a spring member (not shown) to the second developing roller 231Y are executed. Is done.

  When the swinging operation of the third link member 503 is performed in conjunction with the movement operation of the interlocking member 505 in the arrow A1 direction, the third drum rotating member 513C and the third developing operation are interlocked with the swinging operation. A rotation operation of the moving member 523C in the normal rotation direction is executed. Further, when the third drum rotating member 513C and the third developing rotating member 523C are rotated in the forward rotation direction, the third drum rotating member 513C and the third developing rotating member 523C are biased by a spring member (not shown) in accordance with these rotating operations. The connected operation of the third drum coupling member 512C to the third photoreceptor drum 21C and the connecting operation of the third developing coupling member 522C biased by a spring member (not shown) to the third developing roller 231C are executed. Is done.

  When the swinging operation of the fourth link member 504 is executed in conjunction with the movement operation of the interlocking member 505 in the arrow A1 direction, the fourth drum rotating member 513M and the fourth developing operation are interlocked with the swinging operation. A rotation operation of the moving member 523M in the normal rotation direction is executed. Further, when the fourth drum rotating member 513M and the fourth developing rotating member 523M are rotated in the forward rotation direction, they are biased by a spring member (not shown) in accordance with these rotating operations. The connected operation of the fourth drum coupling member 512M to the fourth photosensitive drum 21M and the connecting operation of the fourth developing coupling member 522M biased by a spring member (not shown) to the fourth developing roller 231M are executed. Is done.

  FIG. 17 shows the separation operation of the drum coupling members 512Bk, 512Y, 512C, and 512M with respect to the photosensitive drums 21Bk, 21Y, 21C, and 21M in the first drive transmission system 50 of the drive transmission device 5, and the developing rollers. 231Bk, 231Y, 231C, and 231M are diagrams for explaining the separation operation of the developing coupling members 522Bk, 522Y, 522C, and 522M. 17A shows a plan view, FIG. 17B shows a view from above, and FIG. 17C illustrates the first drive transmission mechanism 56. FIG. 18 is a diagram for explaining the separation operation of the first drum coupling member 512Bk with respect to the first photosensitive drum 21Bk in the first drive transmission system 50 of the drive transmission device 5. 18A shows a perspective view, and FIG. 18B shows a cross-sectional view.

  When the interlocking member 505 moves in the direction of the arrow A2 in FIG. 17, the first link member 501 of the first drive transmission mechanism 56 and the second link of the second drive transmission mechanism 57 are interlocked with the movement operation of the interlocking member 505. The swinging operation of the member 502, the third link member 503 of the third drive transmission mechanism 58, and the fourth link member 504 of the fourth drive transmission mechanism 59 is executed.

  When the swinging operation of the first link member 501 is performed in conjunction with the movement operation of the interlocking member 505 in the arrow A2 direction, the first drum rotating member 513Bk and the first developing operation are interlocked with the swinging operation. A rotation operation of the moving member 523Bk in the reverse rotation direction is executed. Further, when the first drum rotation member 513Bk and the first developing rotation member 523Bk are rotated in the reverse rotation direction, the first drum coupling member 512Bk is changed according to the rotation operation. The separating operation with respect to the first photosensitive drum 21Bk and the separating operation with respect to the first developing roller 231Bk of the first developing coupling member 522Bk are executed.

  When the swinging operation of the second link member 502 is performed in conjunction with the movement operation of the interlocking member 505 in the arrow A2 direction, the second drum rotating member 513Y and the second developing operation are interlocked with the swinging operation. A rotation operation of the moving member 523Y in the reverse rotation direction is executed. Further, when the second drum rotation member 513Y and the second development rotation member 523Y are rotated in the reverse rotation direction, the second drum coupling member 512Y is moved according to the rotation operations. The separating operation with respect to the second photosensitive drum 21Y and the separating operation with respect to the second developing roller 231Y of the second developing coupling member 522Y are executed.

  When the swinging operation of the third link member 503 is performed in conjunction with the movement operation of the interlocking member 505 in the arrow A2 direction, the third drum rotating member 513C and the third developing operation are interlocked with the swinging operation. A rotation operation of the moving member 523C in the reverse rotation direction is performed. Further, when the third drum rotation member 513C and the third developing rotation member 523C are rotated in the reverse rotation direction, the third drum coupling member 512C is changed according to the rotation operation. A separating operation with respect to the third photosensitive drum 21C and a separating operation with respect to the third developing roller 231C of the third developing coupling member 522C are executed.

  When the swinging operation of the fourth link member 504 is executed in conjunction with the movement operation of the interlocking member 505 in the arrow A2 direction, the fourth drum rotating member 513M and the fourth developing operation are interlocked with the swinging operation. A rotation operation of the moving member 523M in the reverse rotation direction is executed. Further, when the fourth drum rotation member 513M and the fourth developing rotation member 523M are rotated in the reverse rotation direction, the fourth drum coupling member 512M is changed according to the rotation operations. A separation operation with respect to the fourth photosensitive drum 21M and a separation operation with respect to the fourth development roller 231M of the fourth development coupling member 522M are executed.

  According to the drive transmission device 5 according to the present embodiment, the first link member 501 of the first drive transmission mechanism 56 and the second link member of the second drive transmission mechanism 57 are interlocked with the moving operation of the interlocking member 505. 502, the third link member 503 of the third drive transmission mechanism 58, and the fourth link member 504 of the fourth drive transmission mechanism 59 can be swung. As a result, the first photosensitive member of the first drum coupling member 512Bk is moved in accordance with the rotating operation of the first drum rotating member 513Bk and the first developing rotating member 523Bk in conjunction with the swinging operation of the first link member 501. The connecting and separating operations with respect to the drum 21Bk and the connecting and separating operations with respect to the first developing roller 231Bk of the first developing coupling member 522Bk can be executed.

  In addition, the second photosensitive drum of the second drum coupling member 512Y is operated in accordance with the rotating operation of the second drum rotating member 513Y and the second developing rotating member 523Y in conjunction with the swinging operation of the second link member 502. The connecting and separating operation with respect to 21Y and the connecting and separating operation with respect to the second developing roller 231Y of the second developing coupling member 522Y can be executed.

  Further, the third photosensitive drum of the third drum coupling member 512C is operated in accordance with the rotating operation of the third drum rotating member 513C and the third developing rotating member 523C in conjunction with the swinging operation of the third link member 503. The connecting and separating operations with respect to 21C and the connecting and separating operations with respect to the third developing roller 231C of the third developing coupling member 522C can be executed.

  Further, the fourth photosensitive drum of the fourth drum coupling member 512M is operated in accordance with the rotating operation of the fourth drum rotating member 513M and the fourth developing rotating member 523M in conjunction with the swinging operation of the fourth link member 504. The connection and separation operation with respect to 21M and the connection and separation operation with respect to the fourth development roller 231M of the fourth development coupling member 522M can be executed.

  That is, the separation operation of each drum coupling member 512Bk, 512Y, 512C, 512M with respect to each photosensitive drum 21Bk, 21Y, 21C, 21M, and each developing roller 231Bk of each developing coupling member 522Bk, 522Y, 522C, 522M, The separation operation with respect to 231Y, 231C, and 231M can be simultaneously performed by the movement operation of the interlocking member 505. Therefore, the separating operation of the drum coupling members 512Bk, 512Y, 512C, and 512M with respect to the photosensitive drums 21Bk, 21Y, 21C, and 21M, and the developing coupling members 522Bk with respect to the developing rollers 231Bk, 231Y, 231C, and 231M, respectively. It is possible to reduce the load on the operator when the separating operations of 522Y, 522C, and 522M are executed simultaneously.

  In the drive transmission device 5 according to the present embodiment, the interlocking member 505 is detachably connected to the first link member 501, the second link member 502, the third link member 503, and the fourth link member 504. ing. By detaching the interlocking member 505 from the first link member 501, the second link member 502, the third link member 503, and the fourth link member 504, a first interlocking with the swinging operation of the first link member 501 is performed. The first drum coupling member 512Bk and the first developing coupling member with respect to the first photosensitive drum 21Bk and the first developing roller 231Bk according to the rotating operation of the drum rotating member 513Bk and the first developing rotating member 523Bk. 522Bk can be connected and separated independently of the interlocking member 505.

  Further, the second photosensitive drum 21Y and the second developing roller 231Y are moved in accordance with the rotating operation of the second drum rotating member 513Y and the second developing rotating member 523Y in conjunction with the swinging operation of the second link member 502. On the other hand, the second drum coupling member 512Y and the second developing coupling member 522Y can be connected and separated independently from the interlocking member 505.

  Further, the third photosensitive drum 21C and the third developing roller 231C are moved according to the rotating operation of the third drum rotating member 513C and the third developing rotating member 523C in conjunction with the swinging operation of the third link member 503. On the other hand, the third drum coupling member 512C and the third developing coupling member 522C can be connected and separated independently from the interlocking member 505.

  Further, the fourth photosensitive drum 21M and the fourth developing roller 231M are moved according to the rotating operation of the fourth drum rotating member 513M and the fourth developing rotating member 523M in conjunction with the swinging operation of the fourth link member 504. On the other hand, the fourth drum coupling member 512M and the fourth developing coupling member 522M can be connected and separated independently from the interlocking member 505.

  In the first drive transmission system 50 of the drive transmission device 5 according to the present embodiment, as shown in FIGS. 12 and 13, a first drive transmission mechanism 56, a second drive transmission mechanism 57, a third drive transmission mechanism 58, and It is desirable that one unit structure 500 is constituted by the fourth drive transmission mechanism 59. In this case, the interlocking member 505 is attached to the frame structure 19 separately from the unit structure 500. With such a configuration, the mountability and the detachability of the interlocking member 505 with respect to the first link member 501, the second link member 502, the third link member 503, and the fourth link member 504 of the unit structure 500 are improved. Can do. For this reason, the interlocking member 505 is detached from the first link member 501, the second link member 502, the third link member 503, and the fourth link member 504, and the photosensitive drums 21Bk, 21Y, 21C, and 21M are removed. Each drum coupling member 512Bk, 512Y, 512C, 512M is connected and separated independently from the interlocking member 505, and each developing coupling member 522Bk, 522Y, 522C, 522M is connected to each developing roller 231Bk, 231Y, 231C, 231M. The workability when connecting and separating them independently of the interlocking member 505 can be improved.

  Further, in the first drive transmission system 50 of the drive transmission device 5 according to the present embodiment, as shown in FIG. 14, in the first drive transmission mechanism 56, the first rotation of the first drum rotation member 513Bk is performed. The moving radius r1 is different from the second turning radius r2 of the turning operation of the first developing turning member 523Bk. Specifically, the first turning radius r1 is larger than the second turning radius r2.

  Further, the rotation radius of the rotation operation of the second drum rotation member 513Y, the rotation radius of the rotation operation of the third drum rotation member 513C, and the rotation radius of the rotation operation of the fourth drum rotation member 513M. Is the same as the first turning radius r1 of the turning operation of the first drum turning member 513Bk. Further, the turning radius of the second developing turning member 523Y, the turning radius of the third developing turning member 523C, and the turning radius of the fourth developing turning member 523M. Is the same as the second turning radius r2 of the turning operation of the first developing turning member 523Bk. That is, the second drum provided in the second drive transmission mechanism 57 is similar to the relationship of the rotation radius between the first drum rotation member 513Bk and the first developing rotation member 523Bk provided in the first drive transmission mechanism 56. The turning radii of the turning member 513Y and the second developing turning member 523Y are different from each other, and the turning radii of the third drum turning member 513C and the third developing turning member 523C provided in the third drive transmission mechanism 58 are different. Are different from each other, and the rotation radii of the fourth drum rotation member 513M and the fourth development rotation member 523M provided in the fourth drive transmission mechanism 59 are different from each other.

  The swinging operation of the first link member 501, the second link member 502, the third link member 503, and the fourth link member 504 in such a configuration will be described with reference to FIGS. FIGS. 19 to 21 illustrate the separating operation of the drum coupling members 512Bk, 512Y, 512C, and 512M with respect to the photosensitive drums 21Bk, 21Y, 21C, and 21M, and the developing cups with respect to the developing rollers 231Bk, 231Y, 231C, and 231M. It is a figure which shows the mode of the rocking | fluctuation operation | movement of each link member 501, 502, 503, 504 when the separation operation | movement of ring member 522Bk, 522Y, 522C, 522M is performed by the movement operation | movement of the interlocking member 505. FIG.

  FIG. 19A shows the drum rotation members 513Bk, 513Y, 513C, 513M, and each of the first drive transmission mechanism 56, the second drive transmission mechanism 57, the third drive transmission mechanism 58, and the fourth drive transmission mechanism 59. The developing rotation members 523Bk, 523Y, 523C, and 523M show a state where they reach the rotation end position in the normal rotation direction. 19 (B) to (E), FIGS. 20 (A) to (E), and FIGS. 21 (A) to (E) show the interlocking member 505 in the direction of arrow A2 from the state shown in FIG. 19 (A). The state of the swinging motion of the link members 501, 502, 503, and 504 when continuously moved in FIG. 19B to 19E, FIGS. 20A to 20E, and FIGS. 21A to 21E are in chronological order later.

  In the configuration in which the first turning radius r1 of the turning operation of the first drum turning member 513Bk is different from the second turning radius r2 of the turning operation of the first developing turning member 523Bk, the first drum turning member 513Bk. The first link connecting portion 501B is connected to the first developing rotating member 523Bk and the second link connecting portion 501C is connected to the first link connecting portion 501B. An angle θ (hereinafter referred to as “first swinging operation angle θ”) formed by a line connecting the center of the two-link connecting portion 501C and a straight line perpendicular to the drum rotation axis L1 and the roller rotation axis L2 is changed. To be executed.

  The first swing operation angle θ is maximized when the first drum rotation member 513Bk and the first development rotation member 523Bk reach the rotation intermediate position (the state shown in FIG. 20C), and the first drum rotation member 513Bk reaches the maximum rotation position. When the rotation member 513Bk and the first developing rotation member 523Bk reach the rotation end position in the forward rotation direction and the reverse rotation direction (the state shown in FIGS. 19A and 21E), the minimum value is obtained. Become. That is, the first swinging operation angle θ is maximized when the first drum rotation member 513Bk and the first development rotation member 523Bk reach the rotation intermediate position, and the first drum rotation member 513Bk and the first development. It changes according to the swinging motion of the first link member 501 so as to be minimized when the rotation member 523Bk reaches the rotation end position in the forward rotation direction and the reverse rotation direction. With such a configuration, the rotating operation of the first drum rotating member 513Bk and the first developing rotating member 523Bk in conjunction with the swinging operation of the first link member 501 can be performed smoothly even when the rotating radii are different. It will be something.

  Further, in the configuration in which the turning radius of the turning motion of the second drum turning member 513Y is different from the turning radius of the turning motion of the second developing turning member 523Y, the first link is connected to the second drum turning member 513Y. The swinging motion of the second link member 502 to which the connection portion 502B is connected and the second link connection portion 502C is connected to the second developing rotation member 523Y is the center of the first link connection portion 502B and the second link connection portion. Executed so that the angle θ (hereinafter referred to as “second swinging operation angle θ”) formed by a line connecting the center of 502C and a straight line perpendicular to the drum rotation axis L3 and the roller rotation axis L4 changes. The

  The second swinging operation angle θ is maximized when the second drum rotating member 513Y and the second developing rotating member 523Y reach the rotation intermediate position (the state shown in FIG. 20C), and the second drum rotating member 513Y reaches the second intermediate rotation position. When the rotation member 513Y and the second development rotation member 523Y reach the rotation end position in the forward rotation direction and the reverse rotation direction (the state shown in FIGS. 19A and 21E), the minimum value is obtained. Become. That is, the second swinging operation angle θ becomes the maximum when the second drum rotating member 513Y and the second developing rotating member 523Y reach the rotating intermediate position, and the second drum rotating member 513Y and the second developing member. It changes according to the swinging motion of the second link member 502 so as to be minimized when the rotation member 523Y reaches the rotation end position in the forward rotation direction and the reverse rotation direction. With such a configuration, the rotating operation of the second drum rotating member 513Y and the second developing rotating member 523Y in conjunction with the swinging operation of the second link member 502 is smooth even in a configuration in which the rotating radii are different. It will be something.

  Further, in the configuration in which the turning radius of the turning operation of the third drum turning member 513C is different from the turning radius of the turning operation of the third developing turning member 523C, the first link is connected to the third drum turning member 513C. The swinging motion of the third link member 503, to which the connection portion 503B is connected and the second link connection portion 503C is connected to the third developing rotation member 523C, is the center of the first link connection portion 503B and the second link connection portion. Executed so that an angle θ (hereinafter referred to as “third swinging operation angle θ”) formed by a line connecting the center of 503C and a straight line perpendicular to the drum rotation axis L5 and the roller rotation axis L6 changes. The

  The third swinging operation angle θ is maximized when the third drum rotating member 513C and the third developing rotating member 523C reach the rotation intermediate position (the state shown in FIG. 20C), and the third drum When the rotation member 513C and the third developing rotation member 523C reach the rotation end position in the forward rotation direction and the reverse rotation direction (the state shown in FIGS. 19A and 21E), the minimum value is obtained. Become. That is, the third swinging operation angle θ is maximized when the third drum rotating member 513C and the third developing rotating member 523C reach the rotating intermediate position, and the third drum rotating member 513C and the third developing member. It changes according to the swinging motion of the third link member 503 so as to be minimized when the turning member 523C reaches the turning end position in the forward turning direction and the reverse turning direction. With such a configuration, the rotating operation of the third drum rotating member 513C and the third developing rotating member 523C in conjunction with the swinging operation of the third link member 503 is smooth even in a configuration in which the rotating radii are different. It will be something.

  Further, in the configuration in which the turning radius of the turning operation of the fourth drum turning member 513M is different from the turning radius of the turning operation of the fourth developing turning member 523M, the first link is connected to the fourth drum turning member 513M. The swinging operation of the fourth link member 504, to which the connecting portion 504B is connected and the second link connecting portion 504C is connected to the fourth developing rotating member 523M, is connected to the center of the first link connecting portion 504B and the second link connecting portion. Executed so that an angle θ (hereinafter referred to as a “fourth swinging operation angle θ”) formed by a line connecting the center of 504C and a straight line perpendicular to the drum rotation axis L7 and the roller rotation axis L8 changes. The

  The fourth swing operation angle θ is maximized when the fourth drum rotation member 513M and the fourth development rotation member 523M reach the rotation intermediate position (the state shown in FIG. 20C), and the fourth drum rotation angle θ is maximized. When the rotation member 513M and the fourth development rotation member 523M reach the rotation end position in the forward rotation direction and the reverse rotation direction (the state shown in FIGS. 19A and 21E), the minimum value is obtained. Become. That is, the fourth swinging operation angle θ is maximized when the fourth drum rotating member 513M and the fourth developing rotating member 523M reach the rotating intermediate position, and the fourth drum rotating member 513M and the fourth developing member. It changes according to the swinging motion of the fourth link member 504 so that the rotation member 523M is minimized when it reaches the rotation end position in the forward rotation direction and the reverse rotation direction. With such a configuration, the rotating operation of the fourth drum rotating member 513M and the fourth developing rotating member 523M in conjunction with the swinging operation of the fourth link member 504 is smooth even in a configuration in which the rotating radii are different. It will be something.

  The drive transmission device 5 and the image forming apparatus 1 including the drive transmission device 5 according to the embodiment of the present invention have been described above. However, the present invention is not limited to this, and for example, the following modified embodiment is adopted. Can do.

  (1) In the above embodiment, the first drive transmission mechanism 56, the second drive transmission mechanism 57, the third drive transmission mechanism 58, and the fourth corresponding to the image forming units 2Bk, 2Y, 2C, and 2M for four colors, respectively. Although the configuration of the drive transmission device 5 including the drive transmission mechanism 59 has been described, the present invention is not limited to this. The drive transmission device 5 may be configured to include at least two drive transmission mechanisms.

  (2) In the above embodiment, the configuration in which the photosensitive drum and the developing roller are applied as the rotating body has been described, but the present invention is not limited to this. A rotating body other than the photosensitive drum and the developing roller may be applied. For example, the driving force may be transmitted to a screw member (not shown) disposed inside the developing device 23 instead of the developing roller.

  (3) In the above embodiment, the first link member 501 is connected to the first drum rotating member 513Bk and the first developing rotating member 523Bk, and the second drum rotating member 513Y and the second developing rotating member 523Y are connected. The second link member 502 is connected to the third drum rotating member 513C and the third developing rotating member 523C is connected to the third link member 503, and the fourth drum rotating member 513M and the fourth developing rotating member are connected. Although the configuration in which the fourth link member 504 is connected to the member 523M has been described, the present invention is not limited to this. For example, the first drum rotating member 513Bk, the second drum rotating member 513Y, the third drum rotating member 513C, and the fourth drum rotating member 513M are connected by one link member, and the first developing rotating member 523Bk, The second developing member 523Y, the third developing member 523C, and the fourth developing member 523M may be connected by a single link member.

1 Image forming device 2 Image forming unit (image forming system)
2Bk first image forming unit (first structure)
2Y Second image forming unit (second structure)
2C Third image forming unit 2M Fourth image forming unit 21Bk First photosensitive drum (first rotating body, image carrier)
21Y Second photosensitive drum (first rotating body, image carrier)
21C Third photosensitive drum (first rotating body, image carrier)
21M Fourth photosensitive drum (first rotating body, image carrier)
22 Charging device 23 Developing device 231Bk First developing roller (second rotating body)
231Y Second developing roller (second rotating body)
231C Third developing roller (second rotating body)
231M Fourth developing roller (second rotating body)
5 drive transmission device 51 drum transmission system 511Bk first drum gear 511Y second drum gear 511C third drum gear 511M fourth drum gear 512Bk first drum coupling member (first drive member)
512Y Second drum coupling member (first driving member)
512C Third drum coupling member (first drive member)
512M Fourth drum coupling member (first driving member)
513Bk first drum rotating member (first rotating member)
513Y Second drum rotating member (first rotating member)
513C Third drum rotating member (first rotating member)
513M Fourth drum rotating member (first rotating member)
513a Drum rotation engagement part (first engagement part)
514Bk first drum bush member 514Y second drum bush member 514C third drum bush member 514M fourth drum bush member 52 development transmission system 521Bk first development gear 521Y second development gear 521C third development gear 521M fourth development gear 522Bk first 1 development coupling member (second drive member)
522Y Second developing coupling member (second driving member)
522C Third developing coupling member (second driving member)
522M Fourth developing coupling member (second driving member)
523Bk first developing rotation member (second rotation member)
523Y Second developing rotating member (second rotating member)
523C third developing rotating member) second rotating member)
523M Fourth developing rotating member (second rotating body)
523a Development rotation engagement portion (second engagement portion)
524Bk first developing bush member 524Y second developing bush member 524C third developing bush member 524M fourth developing bush member 56 first drive transmission mechanism 57 second drive transmission mechanism 58 third drive transmission mechanism 59 fourth drive transmission mechanism 500 unit Structure 501 First link member (link member)
501A 1st link projection part 501B 1st link connection part (1st connection part)
501C 2nd link connection part (2nd connection part)
502 Second link member (link member)
502A Second link protrusion 502B First link connection (first connection)
502C 2nd link connection part (2nd connection part)
503 Third link member (link member)
503A 3rd link projection part 503B 1st link connection part (1st connection part)
503C 2nd link connection part (2nd connection part)
504 Fourth link member (link member)
504A 4th link projection part 504B 1st link connection part (1st connection part)
504C Second link connection (second connection)
505 Interlocking member

Claims (5)

Drive transmission for transmitting a driving force generated by a drive source to the first rotating body and the second rotating body of the first structure and the second structure including a combination of the first rotating body and the second rotating body. A device,
A first drive transmission mechanism for transmitting a driving force generated by the drive source to the first rotating body and the second rotating body of the first structure;
A second drive transmission mechanism for transmitting a driving force generated by the drive source to the first rotating body and the second rotating body of the second structure;
An interlocking member that interlocks the drive transmission operation of the first drive transmission mechanism and the drive transmission operation of the second drive transmission mechanism;
The first drive transmission mechanism and the second drive transmission mechanism are respectively
The first rotation in the axial direction of the first rotation axis, which is arranged coaxially with the first rotation axis, receives the driving force from the drive source and rotates the first rotation body around the first rotation axis. A first drive member that can be connected to and separated from the body;
The first drive shaft is arranged coaxially with the first rotation shaft, and rotates in a positive rotation direction around the first rotation shaft, thereby connecting the first drive member to the first rotation body. A first rotating member that moves the first drive member away from the first rotating body by rotating in an opposite reverse rotation direction, and has a first engaging portion at a part of an outer peripheral edge. A rotating member;
The second rotating shaft arranged coaxially with the second rotating shaft, which receives a driving force from the driving source and rotates the second rotating body around a second rotating shaft parallel to the first rotating shaft. A second drive member that can be connected to and separated from the second rotating body in the axial direction of
The second driving member is disposed coaxially with the second rotating shaft and rotates in a positive rotating direction around the second rotating shaft to connect the second driving member to the second rotating body. A second rotating member that moves the second driving member away from the second rotating body by rotating in the opposite reverse rotating direction, and has a second engaging portion at a part of the outer periphery. A rotating member;
A first connecting portion connected to the first engaging portion of the first rotating member; and a second connecting portion connected to the second engaging portion of the second rotating member, The first rotation is performed by spanning between a first engagement portion and the second engagement portion and swinging along a plane perpendicular to the first rotation shaft and the second rotation shaft. A link member for interlocking the rotation operation of the member and the rotation operation of the second rotation member,
The interlocking member is detachably connected to the link member of the first drive transmission mechanism and the link member of the second drive transmission mechanism, and moves along a predetermined direction parallel to the one plane. A drive transmission device that interlocks the swing operation of the link member of the first drive transmission mechanism with the swing operation of the link member of the second drive transmission mechanism. The drive transmission device according to claim 1,
The first turning radius of the turning motion of the first turning member is different from the second turning radius of the turning motion of the second turning member,
In the link member, a line segment connecting the center of the first connecting portion and the center of the second connecting portion, and perpendicular to the first rotating shaft and the second rotating shaft and in the moving direction of the interlocking member An angle formed by a straight line extending along the drive member changes in accordance with the swinging motion of the link member. The drive transmission device according to claim 1 or 2,
The first drive transmission mechanism and the second drive transmission mechanism constitute one unit structure,
The interlocking member is a drive transmission device that is separate from the unit structure. An image forming system for forming an image on a sheet, comprising a first structure and a second structure including a combination of a first rotating body and a second rotating body;
A driving source for generating a driving force for driving the image forming system;
An image forming apparatus comprising: the drive transmission device according to claim 1, wherein a drive force generated by the drive source is transmitted to the first rotary body and the second rotary body. The image forming apparatus according to claim 4.
The first rotating body is one of an image carrier having a peripheral surface for supporting a developer image, and a developing roller for supplying a developer to the peripheral surface of the image carrier,
The image forming apparatus, wherein the second rotating body is the other of the image carrier and the developing roller.

Images