JP5832154B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus including a door that opens and closes with respect to an apparatus main body.

  The image forming apparatus is provided with an opening / closing member (door) that can be opened and closed with respect to the apparatus main body in order to attach / detach the cartridge, clean the inside of the apparatus, or perform jam processing.

  In order to hold such a door in a closed state with respect to the apparatus main body, engagement members that can be engaged with holes in the apparatus main body are held at both ends of the door, and each engagement member is engaged with a corresponding hole. There is a configuration in which each engaging member is biased by a spring so as to match (Patent Document 1).

  Further, in order to assist the user in opening the door when opening the door, a configuration (so-called pop-up mechanism) provided with a spring that biases the door in the opening direction is known.

  In the configuration of Patent Document 1, in the case where a spring that biases the door in the opening direction is provided, when the user closes the door by pressing only one side of the door, the following state may be obtained. That is, this is a so-called one-closed state in which only the engagement member pushed by the user is engaged with the main body and the other engagement member is not engaged. The reason for this is that the engaging members on both sides move independently and engage with the apparatus main body. In particular, the larger the door and the lower the rigidity, the more likely the door will bend due to the biasing force of the spring that biases the door in the opening direction when only one side of the door is pressed. Cheap.

  In this single-closed state, the appearance is not so different from the state in which the door is completely closed, so that the user may recognize that the door is completely closed despite the single-closed state. If the apparatus is operated in such a single-closed state, dust may enter the apparatus or laser light from the laser scanner may leak out of the apparatus. In addition, when the device is equipped with a safety mechanism that does not operate the device when it is in the single-closed state, the user needs to notice the single-closed state and close the door in order to operate the device, reducing the user's work efficiency. There is a risk of it.

JP2008-3403

  Therefore, as shown in FIG. 12, which is a view of the door 101 viewed from the radial direction of the rotation axis X, the link member 105 connects the engaging members 103a and 103b at both ends of the door 101 by the connecting portion 108, and the both ends are engaged. A configuration has been proposed in which the joint members 103a and 103b are moved in conjunction with each other. The link member 105 is held by the opening / closing member 101 so as to be slidable in the left-right direction in the figure by the two guide members 109, and is rotated by the engaging members 103a, 103b held rotatably at both ends of the opening / closing member 101, respectively. Fits freely. The link member 105 is urged in the R direction by the spring 110, and the engagement members 103a and 103b are urged through the link member 105 in a direction to engage with the holes 104a and 104b of the main body.

  In this configuration, since the engagement members 103a and 103b at both ends are restrained from moving independently, only one engagement member is engaged with the main body and the door 101 is not engaged with the other engagement member. It is possible to prevent the held single-closed state.

  In this configuration, when the user closes the door 101 by pressing only one side (right side in the figure) of the door 101 with the force W, the portion of the door 101 that is not pushed by the user (left side in the figure) is directly from the user. Not receiving power. Therefore, the side of the door 101 not pressed by the user moves later than the portion of the door 101 pressed by the user, and the door 101 is bent and twisted with respect to the rotation axis X. Become.

  Then, the engaging member 103a on the side pushed by the user reaches a position where it can engage with the hole 104a of the main body. On the other hand, the engagement member 103b on the non-pressed side receives a biasing force F by the spring 106b biasing in the opening direction, so that the door 101 remains twisted, and the engagement member 103b has a hole 104b. It is not possible to reach the position where it engages with (Fig. 12 (a)). For this reason, the movement of the engaging member 103a interlocked with the engaging member 103b via the link member 105 in the direction of engaging with the hole 104a is also restricted. Therefore, the engaging member 103a cannot fully engage with the hole 104a even though it has reached a position where it can engage with the hole 104a.

  As a result, when the user releases his / her hand from the door 101, the engaging member 103a loses the urging force of the spring 106a and cannot engage with the hole 104a, and the door 101 opens (FIG. 12B). In particular, as the door 101 is larger or its rigidity is lower, the door 101 is more easily bent, and the above-described situation is more likely to occur.

  Thus, in the configuration of FIG. 12, if the user does not move the engagement members 103 a and 103 b to the positions where both of the engagement members 103 a and 103 b are engaged with the holes 104 a and 104 b of the main body by pushing both sides of the door 101, The door cannot be closed by engaging. That is, the configuration of FIG. 12 can suppress the single-closed state, but there is still room for improvement from the viewpoint of usability for easily closing the door 101.

  In view of the above problems, the present invention provides an image forming apparatus having an urging unit that urges the opening / closing member in the opening direction with respect to the apparatus main body. An object of the present invention is to provide an image forming apparatus that can be easily closed.

  Accordingly, the present invention provides an opening / closing member that can be opened and closed with respect to the apparatus main body, a first engagement member and a second engagement member for engaging the opening / closing member and the apparatus main body, the first engagement member, An engagement unit including a connection member connected to the second engagement member, and the first engagement member and the second engagement member move in a direction to engage the opening / closing member and the apparatus main body. First urging means for urging the engaging unit, and second urging means for urging the opening / closing member so that the opening / closing member opens with respect to the apparatus main body. The second engagement member moves in the direction in which the opening / closing member and the apparatus main body are engaged in conjunction with the movement of the first engagement member in the direction in which the opening / closing member and the apparatus main body are engaged. In the forming apparatus, the second urging means is formed by the first engaging member of the opening / closing member. Characterized by applying a biasing force only on the side that engages the Okimoto body.

  According to the present invention, in an image forming apparatus having an urging unit that urges the opening / closing member in the opening direction with respect to the apparatus main body, the opening / closing member is unlikely to be in a single-closed state, and the opening / closing member can be easily closed.

1 is a schematic sectional view of an image forming apparatus. 1 is a perspective view of an image forming apparatus. FIG. 2A is a schematic cross-sectional view of an image forming apparatus in a state where a door is closed with respect to the apparatus main body. FIG. 2B is a schematic cross-sectional view of the image forming apparatus in a state where the door is opened with respect to the apparatus main body. (A) The figure which looked at the door of the state in which the door was closed and locked with respect to the apparatus main body from the radial direction of the rotating shaft X. FIG. (B) The figure which looked at the door of the state by which the lock of the door and the apparatus main body was cancelled | released from the radial direction of the rotating shaft X. FIG. The perspective view of a door. (A) The perspective view of the engagement unit of the door of the state in which the button is not pressed, and the button of an apparatus main body. (B) The perspective view of the engagement unit of the door of the state in which the button was pushed, and the button of an apparatus main body. (A) The figure which looked at the door of the state which only the left engaging member engaged with the hole from the radial direction of the rotating shaft X. FIG. (B) is the figure which looked at the door of the state in which two engaging members are not engaging with each hole from the radial direction of the rotating shaft X, respectively. The figure which looked at the door from the radial direction of the rotating shaft X. FIG. (A) The figure which looked at the door of the state which only the right engaging member engaged with the hole from the radial direction of the rotating shaft X. FIG. (B) The figure which looked at the door of the state which two engaging members each engaged with the hole from the radial direction of the rotating shaft X. FIG. The figure which looked at the door from the radial direction of the rotating shaft X. FIG. The fragmentary sectional view of an engaging member and a hole. The figure which looked at the door in the conventional structure from the radial direction of the rotating shaft X. FIG.

<First Embodiment>
The configuration of the first embodiment of the image forming apparatus according to the present invention will be described.

  In this embodiment, first, the overall configuration of the image forming apparatus will be described, and then the opening / closing member, the engagement mechanism between the opening / closing member and the apparatus main body, and the mechanism during the closing operation of the opening / closing member will be described.

[Entire configuration of image forming apparatus]
FIG. 1 is a schematic sectional view of the image forming apparatus 100. The image forming apparatus 100 includes, as image forming units, a photosensitive drum 203, a charging unit (not illustrated) that acts on the photosensitive drum 203, a developing unit, a cleaning unit, a laser scanner 211 that exposes the photosensitive drum 203, and a photosensitive drum 203. A transfer roller 204 for transferring a charged image to the sheet S and a fixing unit 205 for fixing the toner image on the sheet S are arranged in the apparatus. The process cartridge 202 includes a photosensitive drum 203 and a charging unit (not shown) that acts on the photosensitive drum 203, a developing unit, and a cleaning unit, and opens the door, which will be described later, to open the inside of the apparatus main body. Detachable.

  The image forming apparatus 100 uniformly charges the surface of the photosensitive drum by rotating the photosensitive drum 203 having the photosensitive layer, bringing a charging roller of a charging unit into contact with the surface, and applying a voltage. Next, the photosensitive drum 203 is irradiated with laser light corresponding to the image information from the laser scanner 211 through the exposure opening 212 to form a latent image on the photosensitive drum 203. Then, this latent image is developed with toner by a developing means (not shown) to be visualized as a toner image.

  In synchronization with the formation of the toner image on the photosensitive drum 203, the sheet S is sent out from the sheet storage cassette 213 by the pickup roller 214 and then conveyed by the conveying roller 215. Next, the sheet S is temporarily stopped by the registration roller pair 210 and conveyed to a transfer nip N formed by the photosensitive drum 203 and a transfer roller 204 as a transfer unit at a timing that matches the toner image. Next, the toner image formed on the photosensitive drum 203 at the transfer nip N is transferred to the sheet S by the transfer roller 204. Next, the sheet S to which the toner image is transferred is conveyed to the fixing unit 205. The fixing unit 205 includes a fixing rotator 206 having a built-in heater and a pressure roller 207 that presses and conveys the sheet S to the rotator 206, and heats and presses the sheet S on which the toner image is formed. The toner image is fixed on the sheet S. The sheet S on which the toner image is fixed is conveyed by the paper discharge roller 208 and discharged to the discharge unit 209. The toner remaining on the photosensitive drum 203 after passing through the transfer nip N is removed from the photosensitive drum 203 by a cleaning unit (not shown).

  In general, when the number of sheets to be passed increases, some members and units constituting the image forming means require maintenance work. This maintenance work includes work for exchanging consumable parts such as the process cartridge 202, for example. Further, when a jam of the sheet S occurs during image formation on the sheet S, it is necessary to temporarily stop the image forming operation and remove the sheet S.

[Door configuration]
2A and 2B are perspective views of the image forming apparatus 100. FIG. 2A shows a state in which the door 111 is closed with respect to the apparatus main body, and FIG. 2B shows a state in which the door 111 is opened with respect to the apparatus main body. The image forming apparatus 100 is provided with a door (opening / closing member) 111 that can be opened and closed with respect to the apparatus main body so that the user can easily perform the replacement work of the process cartridge 202 and the jam processing as described above. Accordingly, when the user opens the door 111, the inside of the apparatus main body is opened, and the process cartridge 202 can be easily replaced and jammed.

  The door 111 also serves as an exterior cover of the apparatus main body, and can be opened and closed about a rotation axis X provided inside the main body frame above the storage cassette 213. In addition, the door 111 is provided with two engaging members 113 that engage with the apparatus main body at both ends in the direction of the rotation axis. Each of the engaging members 113 is urged in a direction to engage with holes 124 provided on both sides of the door 111 of the apparatus main body in the rotation axis direction.

  When closing the door 111, the user pushes the door 111 and moves the door 111 to the closed position (the state shown in FIG. 2A) so that each of the engagement members 113 engages with the hole 124. The door 111 is locked and held in the closed state. Also, a button 114 is provided on the outer surface of the door 111, and when the user presses the button 114, the engagement between the engagement member 113 and the hole 124 can be released and the door can be opened.

  3A and 3B are schematic cross-sectional views of the image forming apparatus viewed from the direction A in FIGS. 2A and 2B. FIG. 3A shows a state in which the door 111 is closed with respect to the apparatus main body, and FIG. Is shown with respect to the apparatus main body. An opening direction urging lever (second urging means) 115 slidable in the radial direction of the rotation axis X is provided at one end of the door 111 (the back side of the apparatus main body shown in FIG. 2). When the door is in the closed state, the opening direction biasing lever 115 is in a state of abutting against the abutting surface 116 provided on the inner side of the frame of the apparatus main body. At this time, the lever 115 is biased by the spring 117 in a direction to open the door 111 with respect to the apparatus main body.

  For this reason, when the engagement between the engagement member 113 and the hole 123 is released by pressing the button 114, the opening direction biasing lever 115 moves in the radial direction of the rotation axis X, thereby opening the door in the opening direction with respect to the apparatus main body. 111 can be moved automatically. By automatically opening the door 111 in this way, a user's load when opening the door 111 is reduced, and a user who does not know how to open the door 111 can easily understand the operation method.

[Configuration of locking mechanism]
Next, a detailed configuration of the locking mechanism of the door 111 using the engaging member 113 and the hole 124 described above will be described. 4A and 4B are views of the door 111 viewed from the radial direction of the rotation axis X. FIG. 4A shows a state where the door 111 is closed and locked with respect to the apparatus main body 100, and FIG. 4B shows the door 111 and the apparatus main body 100. The state where the lock is released. In addition, about the exterior part etc. which were provided in the door 111, description is abbreviate | omitted in order to simplify description. FIG. 5 is a perspective view of the door 111. Note that members and the like that form part of the exterior of the device provided in the door 111 are omitted for the sake of simplicity.

  First, a configuration of an engagement unit including the engagement members 113a and 113b and a link member 121 as a connection member that connects the two engagement members will be described.

  The engaging members 113 (113a, 113b) are held by the door 111 so as to be rotatable about the fulcrum shafts 118a, 118b at both ends of the door 111 in the rotation axis X direction. The engaging members 113a and 113b are formed with hook portions 119a and 119b that enter the holes 124 (124a and 124b) provided in the apparatus main body 100 and engage with the holes 124, respectively. The engaging members 113a and 113b have link connecting shafts 120a and 120b, respectively. The link connecting shafts 120a and 120b are connected to the link member 121 by connecting portions 122a and 122b. For this reason, the engaging members 113 a and 113 b can rotate with respect to the link member 121. The link connecting shaft 120a is disposed at a position between the hook portion 119a of the engaging member 113a and the fulcrum shaft 118a. The link connecting shaft 120b is disposed at a position where the fulcrum shaft 118b is disposed between the hook portion 119b of the engaging member 113a and the link connecting shaft 120b. Further, the link member 121 is slidable in the left-right direction in the figure by being guided by the guide portion 123 of the door 111.

  Since the engaging unit is configured as described above, the engaging member 113 moves to the lock position (position entering the hole 124) in the same phase in conjunction with the movement of the link member 121 in the R direction (see FIG. 4 (a)). Conversely, in conjunction with the movement of the link member 121 in the L direction, which is the opposite direction of the R direction, the engagement members 113 move to the lock release position (the position that has been removed from the hole 124) in the same phase (FIG. 4 ( b)).

  The lock position of the engagement member 113 indicates a state (FIG. 4A) in which the engagement member 113 is hooked (engaged) in the hook hole (hole) 124 of the apparatus main body 100. The unlocking position refers to a state (FIG. 4B) in which the engaging member 113 is not caught in the hooking hole 124 (the engagement is released).

  Next, the engagement between the engagement unit and the apparatus main body will be described. The engaging unit is urged by a spring (first urging means) 125 so that the engaging members 113a and 113b move in directions in which the engaging members 113a and 113b engage with the hook holes 124, respectively. Then, with this urging force, the engagement unit can be held in a state of being engaged with the apparatus main body (a state in which the engagement members 113 are respectively caught in the hook holes 124), and the door 111 can be held in a closed state. In the present embodiment, the spring 125 is configured to directly apply a biasing force in the R direction only to the engagement member 113a. The urging force of the spring 125 in the R direction is indirectly applied to the engaging member 113b via the link member 121. The direct application of the urging force means that the member (spring 125) that applies the urging force transmits the urging force to the member (engagement member 113b) to which the urging force is applied without any backlash between the members. It means that the urging force is transmitted.

  Next, release of the engagement between the engagement unit and the apparatus main body will be described. 6A and 6B are perspective views of the engagement unit of the door 111 and the button 114 of the apparatus main body. FIG. 6A shows a state where the button 114 is not pressed, and FIG. 6B shows a state where the button 114 is pressed. Other members are not shown for the sake of simplicity. The button 114 is held by the apparatus main body 100 so as to be movable in the Z direction, and an inclined portion 126 is integrally formed. When the user depresses the button 114 (moves in the Z direction), the inclined member 127 of the engaging member 113b with which the inclined portion 126 abuts is pressed, and the engaging member is resisted against the biasing force of the spring 125 (see FIG. 4). 113b moves to the unlock position (FIG. 6B). With this movement, the link member 121 is moved in the L direction opposite to the R direction, and the other engagement member 113a is also moved to the lock release position. For this reason, the hooks of the two engaging members 113 on the hook holes 124 are released, and the engagement between the door 111 and the apparatus main body 100 is released. Therefore, as described above, the opening direction biasing lever 115 moves in the radial direction of the rotation axis X, and the door 111 is automatically moved in the opening direction with respect to the apparatus main body 100.

[Door 111 closing operation]
Next, the case where the door 111 is about to be closed by being pushed only by one side by the user will be described. First, the case where only the side (the engagement member 113b side: the left side in the figure) of the door 111 that does not have the spring 125 and the opening direction biasing lever 115 is pushed will be described.

  FIG. 7 is a view of the door 111 as viewed from the radial direction of the rotation axis X. FIG. 7A shows a state in which only the left engagement member 113b is engaged with the hole 124b, and FIG. The state where each is not engaged with the hole 124 is shown.

  As shown in FIG. 7A, when the user presses only the side (the left side in the figure) that does not have the spring 125 and the opening direction biasing lever 115 of the door 111 with the force W, the door 111 is pressed by the user. The portion on the non-side (right side in the figure) does not receive direct force from the user. For this reason, the side of the door 111 not pressed by the user moves later than the portion of the door 111 pressed by the user, and the door 111 is bent and twisted with respect to the rotation axis X. .

  Then, the engaging member 113b reaches a position where it can be engaged (hooked) with the hooking hole 124b. On the other hand, the engagement member 113a on the side that is not pushed receives the urging (force F) in the opening direction by the opening urging lever 115 on the right side of the door 111 that urges in the opening direction. For this reason, the door 111 remains in a twisted state, and the engaging member 113a cannot reach a position where it can engage with the hole 124a.

  As a result, the movement of the engagement member 113b interlocked with the engagement member 113a via the link member 121 in the direction of engaging with the hole 124b is also restricted. Therefore, the engaging member 113b cannot sufficiently engage with the hole 124a even though the engaging member 113b has reached a position where it can engage with the hole 124b.

  Even if the engaging member 113b is slightly caught in the catching hole 124b due to a shift in the position phase of the two engaging members 113 due to the backlash of the connecting part 122 or the guide part 123, a biasing force is directly applied from the spring 125. Not. For this reason, when the door 111 moves in the opening direction, the engagement member 113b comes off from the hook hole 124b due to the backlash of the engagement unit. As a result, if the user stops pressing the door 111, the user loses the urging force of the opening direction urging lever 115 and cannot hold the hooked state.

  Further, as shown in FIG. 8, the door 111 of this configuration is positively opened on the right side of the door 111 by the urging in the opening direction by the opening direction urging lever 115, so that the door 111 itself is bent. As well as trying to tilt in the direction of FIG. Since the engagement member 113b on the left side of the door 111 tends to move to the inside of the apparatus due to the inclination of the door 111, a slight catch on the hook hole 124b is more easily released.

  By the above movement, when only the side of the door 111 that does not have the spring 125 and the opening direction biasing lever 115 is pushed by the user, the door 111 is not “one-sided closed” and the door 111 is in an open state. .

  Next, a case where only the side of the door 111 having the spring 125 and the opening direction biasing lever 115 (the engaging member 113a side: the right side in the figure) is pushed by the user will be described.

  FIG. 9 is a view of the door 111 as viewed from the radial direction of the rotation axis X. FIG. 9A shows a state in which only the right engagement member 113a is engaged with the hole 124a, and FIG. The state where each is engaged with the hole 124 is shown.

  As shown in FIG. 9A, when the user presses the side of the door 111 having the spring 125 and the opening direction biasing lever 115 (right side in the figure) with a force W, the engaging member 113a engages with the hook hole 124a. Comes in a possible position.

  On the other hand, the portion of the door 111 provided with the engagement member 113b that is not pushed by the user (the left side in the figure) does not receive direct force from the user. For this reason, the side of the door 111 that is not pressed by the user moves later than the portion of the door 111 that is pressed by the user (the right side in the figure), and the door 111 bends with respect to the rotation axis X. It will be in a twisted state.

  And since the urging | biasing force is directly given from the spring 125, the engaging member 113a moves to the direction (lock position direction) hooked on the hook hole 124a. In conjunction with this movement, the other engagement member 113b also tries to move in the direction of engagement (lock position direction) by being hooked into the hole 124b via the link member. At this time, there is no urging | biasing to the opening direction used as resistance in the side in which the engagement member 113b of the door 111 was provided. For this reason, even when the door 111 is in a twisted state, the engaging member 113b is applied with the urging force of the spring 125 via the link member, and moves in the direction in which it engages with the hooking hole 124b. It is caught in the hole 124b.

  By the above movement, when only the side (the right side in the figure) having the spring 125 and the opening direction biasing lever 115 of the door 111 is pushed by the user, both the two engaging members 113 are deeply hooked in the hooking hole 124. Become. Accordingly, the door 111 and the apparatus main body are engaged and the door 111 is closed without being “one-sided closed”.

  In the conventional configuration, when only one side of the door 101 is pushed, the two engaging members 103 cannot engage with the hole 104 and the door 101 is opened. When only the button is pressed, the two engaging members 113 can be engaged with the holes 124 to close the door.

  Therefore, according to the present embodiment, in the image forming apparatus having an urging unit that urges the door 111 in the opening direction with respect to the apparatus main body 100, the door 111 is unlikely to be in a single-closed state, and the door 111 is simply closed. be able to.

  In the above-described embodiment, there is no urging means for urging the door 111 in the opening direction on the side without the opening direction urging lever 115 of the door 111 (left side in the figure), but the opening direction urging lever of the door 111 is not provided. A second opening direction biasing lever may also be provided on the side without 115 (left side in the figure). In this case, the biasing force of the second opening direction biasing lever is such that the engagement member 113b is hooked when the user presses only the side of the door 111 having the opening direction biasing lever 115 (right side in the figure). The biasing force may be small enough to be caught by 124b.

  Further, in the conventional configuration as shown in FIG. 7, the biasing force in the opening direction by the springs 106a and 106b is substantially the same. That is, the biasing force applied to the left side of the door, the biasing force applied to the right side of the door, and the biasing force applied to the left side were substantially the same. However, when only the right side of the door is pushed and closed by the user, the biasing force applied to the left side of the door is applied to the right side of the door so that the engagement member 113b on the left side of the door can be engaged with the hole 124b. It was made to become smaller than the urging force to be done. In this way, the urging force in the opening direction applied to the entire door remains substantially the same as in the conventional configuration, and at least only the right side of the door is pushed, the two engaging members 113 are inserted into the holes 124. The door can be closed by engaging. Therefore, in the image forming apparatus having an urging unit that urges the door 111 in the opening direction with respect to the apparatus main body 100, the door 111 is unlikely to be in a single-closed state, and the door 111 can be easily closed.

  In the present embodiment, the door 111 is configured to rotate around the rotation axis X and open and close with respect to the apparatus main body 100. However, the present invention is not limited to this, and slides (moves) in parallel with the exterior surface. It may be a thing. Moreover, the two engaging members 113 should just be provided in the both ends of the direction orthogonal to the moving direction when the door 111 of the door 111 opens and closes.

  In this embodiment, the engagement unit including the engagement member 113 and the link member 121 is held by the door 111. However, the engagement unit is held by the apparatus main body 100, and the hole in which the engagement member 113 is engaged. The structure which provides 124 in the door 111 may be sufficient. In the present embodiment, the engaging member 113 of the engaging unit rotates and the link member 121 slides. However, another link mechanism may be used. The image forming apparatus 100 of the present embodiment is an electrophotographic image forming apparatus, but may be an image forming apparatus of another system such as an ink jet.

Second Embodiment
Next, a second embodiment will be described. In addition, about the part which is common in 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted. FIG. 10 is a view of the door 111 as seen from the radial direction of the rotation axis X. In the present embodiment, the object to which the spring that biases the engagement unit directly applies the biasing force so that the two engagement members 113 engage with the hole 124 is different from that of the first embodiment.

  That is, in the first embodiment, the spring 125 directly applies the urging force to the engaging member 113a. However, in the second embodiment, the spring 325 directly applies the urging force to the link member 121.

  The spring 317 is a biasing unit that biases the door 111 in the opening direction. Like the opening direction biasing lever 115 of the first embodiment, the spring 317 biases the door 111 in the opening direction on the right side of the door 111 in the drawing. It is fast.

  Even in such a configuration, in the image forming apparatus having an urging unit that urges the door 111 in the opening direction with respect to the apparatus main body 100, the door 111 is unlikely to be in a single-closed state, and the door 111 is simply closed. The same effect as the first embodiment can be obtained.

[Comparison between the first embodiment and the second embodiment]
Next, differences between the first embodiment and the second embodiment will be described.

  In the normal engagement unit, a backlash is formed between the engagement member 113 and the link member 121 so that the two engagement members 113 operate smoothly through the link member 121. Therefore, in the case of the second embodiment, the engaging member 113 is applied with the urging force from the spring 325 when the engaging member 113 that has moved back by the urging force of the spring 325 contacts. That is, in the second embodiment, the urging force applied to the engaging member 113 is obtained by subtracting the amount lost by backlash from the urging force applied by the spring 325 to the link member 121. For this reason, in the second embodiment, when an urging force for engaging the engagement member 113 with the hole 124 is applied in the same manner as in the first embodiment, the spring force of the spring 325 is applied to the spring 125 of the first embodiment. It is necessary to set larger than the spring force. However, if the spring force of the spring 325 is set too large, the load required for releasing the engagement between the engagement member 113 and the hole 124 may increase.

<Third Embodiment>
Next, a third embodiment will be described. In addition, about the part which is common in 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  FIG. 11 is a partial cross-sectional view of the engaging member 113b and the hole 124. FIG. In the present embodiment, an inclined surface 128 is formed at the tip of the hook portion 119b of the engaging member 113b to be called into the hole 124b. The hole 124b is formed with a calling inclined surface 129 for calling the engaging member 113b. Similarly, inclined surfaces 128 and 129 are formed in the engaging member 113a and the hole 124b on the opposite side.

  For this reason, when the inclined surfaces 128 and 129 come into contact with each other, the force in the lock position direction (L direction) of the engagement member 113b is not dispersed but generates a large component force in the direction that is called into the hook hole 124b. . For this reason, even if the door 111 is in a twisted state, it is easier to be called in the direction (lock position direction) in which the engaging member 113 is easily hooked than in the first embodiment.

  As described above, the third embodiment can obtain the same effects as those of the first embodiment. Furthermore, since the engagement member 113 is more reliably called into the hole 124 than in the first embodiment, the operation of closing the door 11 becomes easier and the load on the user can be reduced.

DESCRIPTION OF SYMBOLS 111 Door 113 Engagement member 115 Opening direction bias lever 117 Spring 118 Rotation fulcrum shaft of engagement member 119 Engagement member hook part 120 Engagement member connection shaft 121 Link member 122 Engagement member and link member connection part 124 hook hole 125 spring 100 image forming apparatus X rotating shaft

Claims (5)

An opening and closing member that can be opened and closed with respect to the apparatus body;
A first engagement member and a second engagement member for engaging the opening / closing member and the apparatus main body, and a connection member connected to the first engagement member and the second engagement member. Combined unit,
First urging means for urging the engagement unit so that the first engagement member and the second engagement member move in a direction to engage the opening / closing member and the apparatus main body;
Second urging means for urging the opening / closing member so that the opening / closing member opens with respect to the apparatus main body;
And the second engaging member moves between the opening and closing member and the apparatus main body in conjunction with the movement of the first engaging member in the direction in which the opening and closing member engages with the apparatus main body. In the image forming apparatus that moves in the engaging direction,
The image forming apparatus according to claim 2, wherein the second biasing unit applies a biasing force only to a side of the opening / closing member that is engaged with the apparatus main body by the first engagement member. An opening and closing member that can be opened and closed with respect to the apparatus body;
A first engagement member and a second engagement member for engaging the opening / closing member and the apparatus main body, and a connection member connected to the first engagement member and the second engagement member. Combined unit,
First urging means for urging the engagement unit so that the first engagement member and the second engagement member move in a direction in which the opening / closing member and the apparatus main body are engaged;
Second urging means for urging the opening / closing member so that the opening / closing member opens with respect to the apparatus main body;
And the second engaging member moves between the opening and closing member and the apparatus main body in conjunction with the movement of the first engaging member in the direction in which the opening and closing member engages with the apparatus main body. In the image forming apparatus that moves in the engaging direction,
When the opening / closing member is pressed to close only the side engaged with the apparatus main body by the first engaging member, the second engaging member is moved by the urging force of the first urging means. The second urging means is more than the urging force that the second urging means applies to the side of the opening / closing member that is engaged with the apparatus main body by the first engagement member. An image forming apparatus, characterized in that a biasing force applied to an engagement side of the apparatus main body by the second engagement member of the opening / closing member is small.   The first biasing means is provided so as to directly apply a biasing force to the first engagement member of the engagement unit, and applies a biasing force to the second engagement member via the connecting member. The image forming apparatus according to claim 1, wherein:   The first biasing means is provided so as to directly apply a biasing force to the connecting member of the engagement unit, and the first engaging member and the second engaging member are biased via the connecting member. The image forming apparatus according to claim 1, wherein: The opening and closing member can be opened and closed with respect to the apparatus main body by rotating around the axis,
The said engagement unit is provided in the said opening / closing member, The said 1st engagement member and the said 2nd engagement member are arrange | positioned at the both ends of the said axial direction of the said opening / closing member, The Claim 1 thru | or 5. The image forming apparatus according to claim 4.

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