CN217787606U

CN217787606U - Processing box

Info

Publication number: CN217787606U
Application number: CN202221366243.3U
Authority: CN
Inventors: 敖仕平
Original assignee: Jiangxi Yibo Electronic Technology Co Ltd
Current assignee: Jiangxi Yibo Electronic Technology Co Ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-11-11
Anticipated expiration: 2032-06-02

Abstract

The utility model discloses a processing box, detachably install to among the electrophotographic image forming apparatus, include: a housing; a photosensitive drum; a developing roller; a power receiving member including a power receiving member projection for receiving a driving force from the outside of the process cartridge to rotate the photosensitive drum; a developing roller gear provided at a distal end of the developing roller and capable of receiving a driving force from the power receiving member for driving the developing roller to rotate; the positioning piece comprises a protrusion for receiving an external driving force, and the external driving force is independent of the driving force received by the power receiving piece; at least a part of the exposure projection faces the rotation axis of the photosensitive drum and is arranged outside the power receiving member in the axial direction, and a distance from the rotation axis of the photosensitive drum to a tip of the exposure projection is not less than 90% and not more than 110% of a radius of the photosensitive drum as measured in a direction perpendicular to the rotation axis of the photosensitive drum.

Description

Processing box

Technical Field

The utility model relates to an electrophotographic imaging technical field especially relates to a processing box.

Background

An electrophotographic image forming apparatus including a power take-off that can output power, the power take-off including a power take-off recess configured as a recess and a power take-off gear tooth configured as a helical tooth, and a process cartridge mounted in the electrophotographic image forming apparatus are disclosed in the related art. The conventional process cartridge includes a power receiving element projection configured as a projection and a developing roller gear mounted at one end in an axial direction of the developing roller, the power receiving element projection being engageable with the power output element recess to receive the driving force and the developing roller gear being engageable with the power output element gear teeth to receive the driving force when the process cartridge is mounted in the electrophotographic image forming apparatus, both of which drive the process cartridge.

Although the above-described process cartridge can receive the driving force of the electrophotographic image forming apparatus, the normal operation of the process cartridge can be ensured because the power receiving member protrusion and the developing roller gear of the process cartridge are engaged with the power output member recess and the power output member gear teeth, respectively, otherwise, the process cartridge cannot operate normally, which requires higher accuracy in the relative positions of the power receiving member protrusion and the developing roller gear in the process cartridge, which leads to higher requirements for the accuracy of the engagement of the process cartridge with the electrophotographic image forming apparatus, and higher requirements for the accuracy of the manufacture and assembly of the process cartridge, which is very likely to interfere with the electrophotographic image forming apparatus during the installation of the process cartridge, making the installation of the process cartridge difficult.

SUMMERY OF THE UTILITY MODEL

For solving the problem that exists among the prior art, the utility model provides a new processing box mainly realizes through following technical scheme:

a process cartridge detachably mountable to an electrophotographic image forming apparatus, comprising:

a housing;

a photosensitive drum supported by the housing and rotatable about a photosensitive drum rotation axis extending in an axial direction;

a developing roller supported by the casing and rotatable about a developing roller rotation axis extending in an axial direction;

a power receiver provided at one end of the photosensitive drum, including a power receiver projection for receiving a driving force from outside of the process cartridge to rotate the photosensitive drum;

a developing roller gear provided at a distal end of the developing roller and receiving a driving force from the power receiving member for driving the developing roller to rotate;

the positioning piece comprises a protrusion for receiving external driving force, the external driving force is independent of the driving force received by the power receiving piece, and the positioning piece can rotate relative to the developing roller gear and the developing roller;

the positioning member includes a plurality of protrusions, at least a portion of the protrusions being exposed protrusions exposed to an outside of the process cartridge;

at least a part of the exposure projection faces the photosensitive drum rotation axis and is arranged outside the power receiver in the axial direction, and a distance from the photosensitive drum rotation axis to a tip end of the exposure projection is not less than 90% and not more than 110% of a radius of the photosensitive drum as measured in a direction perpendicular to the photosensitive drum rotation axis.

Further, the protrusions are configured as tooth-like protrusions.

Further, the positioning member is provided coaxially with the developing roller gear, and in the axial direction, the positioning member is disposed outside the developing roller gear.

Further, the developing device further comprises a protective cover, a bearing portion for supporting the developing roller is arranged on the protective cover, the bearing portion is a hollow cylindrical protrusion, the tail end of the developing roller is inserted into the hollow portion of the cylindrical protrusion to be supported by the bearing portion, and the positioning piece is installed on the outer peripheral surface of the bearing portion.

Further, the cylindrical projection of the bearing portion has an opening therein, through which at least a portion of an electrode electrically connected to the developing roller passes.

Further, the positioning member covers at least a part of the electrode as viewed in the axial direction.

Further, at least a portion of the electrode overlaps the positioning member in a direction perpendicular to the axial direction.

Further, the positioning member has a hollow inner peripheral surface into which at least a part of the electrode is inserted.

Further, still include the protecting cover and electrically connect to the electrode of developer roll, in axial direction, at least a part setting of electrode is in the protecting cover with between the setting element.

Further, the positioning member may contact the electrode to limit the electrode from moving toward a direction close to the developing roller.

The utility model discloses a processing box is through being provided with the setting element, can regard as the further supplementary power take off spare of auxiliary member and the coupling of power receiving spare, and only rely on the coupling of power receiving spare convex part and power take off spare, just can drive processing box work, compare in prior art, because the setting element need not to drive the rotation of rotating member, so its required manufacturing and installation accuracy all will be less than prior art, so it has reduced the required precision of processing box manufacturing, the required equipment precision of processing box has also been reduced simultaneously, the success rate of power take off spare and processing box coupling has been improved greatly.

Drawings

FIG. 1 is a schematic view of an angle in the process of mounting a process cartridge to an electrophotographic image forming apparatus according to the present invention;

FIG. 2 is a schematic view of another angle in the process of mounting the process cartridge to the electrophotographic image forming apparatus according to the present invention;

FIG. 3 is a perspective view of the processing cartridge of the present invention;

FIG. 4 is a partial view of the right end of the cartridge of the present invention;

FIG. 5 is a schematic view of the process cartridge according to the present invention, with the protective cover removed from the process cartridge;

FIG. 6 is a schematic view of the power receiving assembly of the present invention showing an angle of the process cartridge;

FIG. 7 is a schematic view of another perspective of the disassembled processing box of the power receiving assembly of the present invention;

FIG. 8 is a schematic sectional view of the cartridge of the present invention;

FIG. 9 is a schematic view of an angle of the electrode and the positioning member mounted on the protecting cover according to the present invention;

FIG. 10 is a schematic view of the positioning member of the present invention removed from the cover;

FIG. 11 is a schematic view of the positioning member and the electrode of the present invention removed from the cover;

FIG. 12 is another schematic view of the electrode and the positioning member mounted on the protecting cover according to the present invention;

FIG. 13 is a schematic cross-sectional view of the protective cover with the electrodes, the positioning member and the photosensitive drum;

fig. 14 is a schematic view of the position relationship between the positioning member and the photosensitive drum installed on the protective cover according to the present invention.

Detailed Description

Example 1

In the following description, the process cartridge 150 is mountable to the electrophotographic image forming apparatus in a direction from back to front, the photosensitive drum 149 is rotatable about a rotation axis extending in a left-right direction (hereinafter also referred to as an axial direction), and the power receiver 148 is disposed on the right side of the process cartridge 150 in the left-right direction.

Integral structure of electrophotographic image forming apparatus

As shown in fig. 1 to 3, the electrophotographic image forming apparatus includes a mounting opening 50, a door cover 13, the door cover 13 having an open position not covering the mounting opening 50 and a closed position covering the mounting opening 50, and a pair of side plates 20 respectively provided at both left and right ends of the electrophotographic image forming apparatus, a housing portion 30 capable of housing a process cartridge 150 being formed between the pair of side plates 20, the process cartridge 150 being mountable along the mounting opening 50 into the housing portion 30 in the electrophotographic image forming apparatus along a predetermined trajectory in a direction from back to front when the door cover 13 is in the open position; the electrophotographic image forming apparatus further includes a driving member 1 and a power take-off 10 movable and rotatable by the driving member 1, the power take-off 10 being movably provided in the electrophotographic image forming apparatus in a left-right direction, and specifically, the power take-off 10 being movable by the driving member 1 in the left-right direction between a retracted position further away from the process cartridge 150 and an extended position closer to the process cartridge 150, the power take-off 10 in the extended position being coupleable with the process cartridge 150 and rotatable as a driving member to drive the rotary member in the process cartridge 150, the power take-off 10 including a power take-off recess 12 configured as a recess and a power take-off gear tooth 11 configured as a helical tooth, the power take-off recess 12 having a shape of an equilateral substantially triangle, but not a strict equilateral triangle but a configuration in which three vertexes (or corners) thereof are chamfered into an arc shape.

[ PROCESSING BOX ]

As shown in fig. 1 to 14, the process cartridge 150 of the present invention will be described in detail below, the process cartridge 150 is detachably mounted in the above-mentioned electrophotographic image forming apparatus, the process cartridge 150 includes a housing 140 that can contain developer, and a photosensitive drum 149 rotatably supported on the housing 140 and a developing roller 139 rotatably supported on the housing 140, wherein the photosensitive drum 149 can rotate around a photosensitive drum rotation axis extending in an axial direction, and the developing roller 139 can rotate around a developing roller rotation axis extending in the axial direction, the process cartridge 150 further includes at least a part of a rotatable stirring frame 132 provided inside the housing 140, the stirring frame 132 can be used for stirring the developer contained in the housing 140 to deliver the developer to the developing roller 139, and the developer carried on the developing roller 139 can be delivered to the photosensitive drum 149 to develop an electrostatic latent image on the photosensitive drum 149.

The process cartridge 150 further includes a power receiving assembly operable to drive the above-described rotary member and a cover 130 covering at least a part of the power receiving assembly, both the power receiving assembly and the cover 130 being provided at the right end of the process cartridge 150, wherein the power receiving assembly includes a power receiving element 148 mounted at the right end of the photosensitive drum 149, the power receiving element 148 includes a power receiving element boss 141 and a power receiving element gear 142 integrally formed, wherein the power receiving element boss 141 has a shape of a substantially equilateral triangle, but is not strictly an equilateral triangle but a configuration in which three vertexes (or corners) thereof are chamfered in an arc shape, and the power receiving element boss 141 is coupled to be driven to rotate with the power output element recess 12 of the power output element 10 in the extended position so that the power receiving element gear 142 follows to rotate, the power receiving assembly further includes a developing roller gear 143 mounted at the right end of the developing roller 139, the developing roller gear 143 being engaged with the power receiving element gear 142 to receive the driving force transmitted from the power receiving element 148, and an agitating frame gear 146 mounted at the right end of the agitating frame 132, wherein a first intermediate transmission gear 144 and a second intermediate transmission gear 145 engaged with each other are further connected between the developing roller gear 143 and the agitating frame gear 146, the developing roller gear 143 can transmit the power received from the power receiving element 148 to the agitating frame gear 146 through the first intermediate transmission gear 144 and the second intermediate transmission gear 145, so that the agitating frame gear 146 is driven to rotate by the rotation of the agitating frame gear 146, that is, the process cartridge 150 can drive the photosensitive drum 149, the developing roller 139, and the agitating frame 132 to rotate only by the coupling of the power protrusion receiving element 141 and the power output element recess 12, compared to the prior art, which simplifies the structure of the power train of the process cartridge 150 and reduces the required manufacturing and assembly accuracy of the process cartridge 150.

Further, since the pto 10 is not completely fixed in the direction perpendicular to the left-right direction and has a slight amount of radial swing under the gravity or during the rotation driven by the drive gear 1, the pto 10 is likely not to be projected in a state where the rotation axis thereof is completely overlapped with the rotation axis of the pto projection 141 during the projection, which causes the pto 10 to be projected in a state where the rotation axis thereof is inclined at a certain angle with respect to the rotation axis of the pto projection 141, and when the pto 10 is projected in such a state, the pto recess 12 may axially interfere with the pto projection 141 to make it difficult or even impossible to couple with the pto projection 141.

Therefore, to solve the above-described problem, on the one hand, the process cartridge 150 is further provided with an adjusting member 160, the adjusting member 160 being provided at the right end portion of the casing 140 and configured as a rib protruding from the right end portion of the casing 140 in a direction perpendicular to the left-right direction, the adjusting member 160 having an adjusting portion 162 facing the rotational axis of the photosensitive drum 149, the adjusting portion 162 having a basic configuration similar to a circular arc curved surface but can also be regarded as a protruding portion protruding to cover the rotational axis of the photosensitive drum 149, the adjusting portion 162 being operative to limit the inclination of the pto 10 within a certain range, that is, when the pto 10 has its rotational axis inclined to some extent with respect to the left-right direction during the extension, the adjusting portion 162 can support and limit the pto 10, thereby suppressing the increase in the inclination thereof.

On the other hand, the process cartridge 150 further includes a positioning member 170 disposed at the right end of the housing 140 and disposed opposite to the adjusting member, the positioning member 170 is configured to abut against the pto 10 during the extension of the pto 10, and positions the pto 10 together with the adjusting member 160, so as to further improve the coupling success rate between the pto recess 12 and the pto projection 141, thereby avoiding the pto 10 from affecting the coupling success rate between the pto recess 12 and the pto projection 141 due to a large radial swing during the extension, and in the left-right direction, the positioning member 170 is disposed at the outer side closer to the housing 140 than the developer roller gear 143, i.e., in the left-right direction, the positioning member 170 is disposed at the outer side of the developer roller gear 143, and on the premise of ensuring that the positioning member 170 can accurately engage with the pto 11, the structure simultaneously reduces the required extension stroke of the pto 10, so that it can be coupled with the pto projection 141 in a shorter stroke, thereby improving the coupling success rate between the pto gear teeth and the pto projection 141; further, the positioning member 170 is coaxially disposed with the developing roller gear 143 and the developing roller 139 and is relatively rotatable, which not only makes the process cartridge structure more compact and contributes to downsizing of the process cartridge, but also makes the positioning member 170 idle only as an auxiliary member without driving the developing roller 139 and the like, thereby reducing the manufacturing and mounting accuracy of the positioning member 170; further, the outer surface of the positioning member 170 is provided with a plurality of protrusions 171, the plurality of protrusions 171 are arranged on the outer surface of the positioning member 170 at intervals in the circumferential direction of the positioning member 170, and the protrusions 171 are engageable in the power take-off gear teeth 11 configured as helical teeth and receive a driving force different from that received by the power take-off gear teeth 148, and during the rotation of the power take-off gear teeth 11, they generate an axial force in the left-right direction near the power take-off gear teeth 441 that urges the power take-off 10 to move from the retracted position to the extended position, that is, by providing at least one protrusion 171 engageable in the power take-off gear teeth 11 on the positioning member 170, which further improves the coupling power and coupling stability of the power take-off recess 12 and the power take-off gear teeth 441, so that the positioning member 170 not only facilitates the positioning of the power take-off 10, but also the protrusions 171 on the positioning member 170 are engageable in the power take-off gear teeth 11 to pull the auxiliary positioning member 10 out of the positioning member from the electrophotographic image forming apparatus; in the process cartridge 150, at least a part of the protrusions 171 are exposed protrusions 171a exposed to the outside of the process cartridge 150, the exposed protrusions 171a are engageable with the power output gear teeth 11, at least a part of the exposed protrusions 171a faces the rotational axis of the photosensitive drum and are disposed outside the power receiving member 148 in the axial direction, and a distance P from the rotational axis of the photosensitive drum to the end of the exposed protrusions 171a, measured in a direction perpendicular to the rotational axis of the photosensitive drum, is not less than 90% of the radius R of the photosensitive drum 149 and not more than 110% of the radius R of the photosensitive drum 149, that is, 0.9R ≦ P ≦ 1.1R, when P is within the range, the positioning member 170 has an optimum engagement state with the power output gear teeth 11, and when both are engaged, the power output member 10 moves from the retracted position to the extended position, it becomes easier and more stable, and, when P is less than 90% of the radius R of the photosensitive drum 149, the protrusion 171 of the positioning member 170 is difficult to engage with the power output gear teeth 11 of the power output member 10, and when P is less than 90% of the radius R of the photosensitive drum 149, the positioning member 171 is engaged with the power output gear teeth 11, the positioning member 171, the power output member is easily interfered with the power output member 10; more preferably, a distance P from the rotation axis of the photosensitive drum to the tip of the exposure protrusion 171a, measured in a direction perpendicular to the rotation axis of the photosensitive drum, is not less than 93% and not more than 107% of the radius R of the photosensitive drum 149, i.e., 0.93R ≦ P ≦ 1.07R.

Preferably, the projection 171 is a toothed projection so that it better fits the profile and direction of the pto gear teeth 11, so that the projection 171 can more easily engage into the pto gear teeth 11, improving the extension stability of the pto 10; further, the positioning member 170 is preferably a spur gear, and alternatively, the positioning member 170 may also be a sprocket, a ratchet, or the like, as long as the technical effects of the positioning member 170 are achieved.

Furthermore, a bearing portion 131 for supporting the developing roller 139 and the positioning member 170 is mounted on the protective cover 130, the bearing portion 131 is configured as a hollow cylindrical protrusion having an inner peripheral surface 131a provided inside the bearing portion 131 and an outer peripheral surface 131b exposed outside the bearing portion 131, a right end portion of the developing roller 139 is rotatably supported in the hollow portion of the bearing portion 131 to be supported by the bearing portion 131, so that the developing roller 139 is positioned by the bearing portion 131, and the positioning member 170 is mounted on the outer peripheral surface 131b of the bearing portion 131, which further improves the space utilization ratio of the process cartridge in the axial direction, makes the process cartridge arrangement more compact, and facilitates the compact design of the process cartridge.

In the process cartridge 150, further comprising an electrode 180 electrically connected to the developing roller 139, the electrode 180 includes a first electrical connection portion 180a electrically connectable to a power supply member (not shown) in the electrophotographic image forming apparatus, a third electrical connection portion 180c contactable with the developing roller 139 to supply power to the developing roller 139, and a second electrical connection portion 180b electrically connecting the first electrical connection portion 180a and the third electrical connection portion 180c, wherein the first electrical connection portion 180a and the second electrical connection portion 180b are disposed to intersect and bend with each other, and the second electrical connection portion 180b and the third electrical connection portion 180c are also disposed to intersect and bend with each other, at least a part of the electrode 180 is disposed between the cover 130 and the positioning member 170 in the axial direction, and the positioning member 170 covers at least a part of the electrode 180 as viewed in the axial direction to restrict the electrode 180 in the axial direction within a certain range to prevent the electrode 180 from coming loose to affect the electrical connection stability with the developing roller 139; further, the positioning member 170 may contact the electrode 180 to restrict the electrode 180 from further moving toward the direction close to the developing roller 139, thereby further improving the stability of the electrical connection between the electrode 180 and the developing roller 139, and based on this structure, the electrode 180 may be positioned on the protective cover 130; an opening 131c is further provided on the cylindrical projection of the bearing portion 131, at least a part of the electrode 180 can pass through the opening 131c from the outside of the bearing portion 131 and protrude into the cylindrical projection of the bearing portion 131, specifically, the second electrical connection portion 180b of the electrode 180 can pass through the opening 131c while protruding into the cylindrical projection of the bearing portion 131 together with the third electrical connection portion 180c, and the positioning member 170 also has a hollow inner peripheral surface 172, and a part of the electrode 180 protruding into the cylindrical projection of the bearing portion 131 is also inserted into the inner peripheral surface 172 of the positioning member 170, in other words, in a direction perpendicular to the axial direction, at least a part of the electrode 180 overlaps with the positioning member 170, which allows the third electrical connection portion 180c of the electrode 180 to abut with the right end portion of the developing roller 139 in the hollow portion of the bearing portion 131 or the inner peripheral surface 172 of the positioning member 170, thereby preventing the electrode 180 from abutting against the outer peripheral surface of the developing roller 139 located in the hollow portion of the bearing portion 131, resulting in large wear of the developing roller 139 and causing unstable positioning of the developing roller 139, and therefore, the problem of stable electrical connection of the developing roller 150 can be achieved by adopting the above-mentioned structure, and the above-process cartridge 180 can be more effectively utilized.

Advantageous effects

Claims

1. A process cartridge detachably mountable to an electrophotographic image forming apparatus, comprising:

a housing;

a developing roller supported by the housing and rotatable about a developing roller rotation axis extending in an axial direction;

the developing roller is characterized by further comprising a positioning piece, wherein the positioning piece comprises a protrusion used for receiving external driving force, the external driving force is independent of the driving force received by the power receiving piece, and the positioning piece can rotate relative to the developing roller gear and the developing roller;

the positioning member includes a plurality of the protrusions, at least a part of the protrusions being exposed protrusions exposed to an outside of the process cartridge;

2. A process cartridge according to claim 1, wherein said projection is configured as a serration.

3. A process cartridge according to claim 1, wherein said positioning member is provided coaxially with said developing roller gear, and said positioning member is disposed outside said developing roller gear in the axial direction.

4. A process cartridge according to claim 1, further comprising a protective cover having thereon a bearing portion supporting said developing roller, said bearing portion being configured as a hollow cylindrical projection, a tip end of said developing roller being inserted into a hollow portion of said cylindrical projection to be supported by said bearing portion, said positioning member being mounted on an outer peripheral surface of said bearing portion.

5. A process cartridge according to claim 4, wherein said cylindrical projection of said bearing portion has an opening therethrough, at least a portion of an electrode electrically connected to said developing roller.

6. A process cartridge according to claim 5, wherein said positioning member covers at least a part of said electrode as viewed in the axial direction.

7. A process cartridge according to claim 5, wherein at least a part of said electrode overlaps with said positioning member in a direction perpendicular to the axial direction.

8. A process cartridge according to claim 5, wherein said positioning member has a hollow inner peripheral surface into which at least a part of said electrode is inserted.

9. A process cartridge according to claim 1, further comprising a protective cover and an electrode electrically connected to said developing roller, at least a part of said electrode being disposed between said protective cover and said positioning member in the axial direction.

10. A process cartridge according to claim 9, wherein said positioning member is contactable with said electrode to restrict movement of said electrode toward a direction approaching said developing roller.