CN220962148U - Processing box - Google Patents

Abstract

The utility model discloses a processing box, comprising: a frame; a photosensitive drum; a first coupling member which can receive an external force and can drive the photosensitive drum to rotate; the first coupling member includes a first protrusion including: a first surface extending in a first direction toward a direction away from the photosensitive drum; a second surface located on a downstream side of the first surface in a rotation direction of the first coupling member, the second surface extending in a direction away from the photosensitive drum and being arranged obliquely with respect to the first direction; a third surface along which a distance from the first end of the photosensitive drum to the third surface, measured in the first direction, decreases in an extension of the third surface in the rotational direction of the first coupling member; the third surface extends from a start position flush with or downstream of the first surface in a rotational direction of the first coupling member.

Description

Processing box

Technical Field

The utility model relates to the technical field of electrophotographic imaging, in particular to a processing box.

Background

Disclosed in the prior art is a process cartridge detachably mountable to an image forming apparatus, wherein the image forming apparatus includes a driving unit including a driving force applying member and a braking force applying member, the process cartridge includes a photosensitive drum and a coupling member provided at one end in a longitudinal direction of the photosensitive drum, the coupling member having a driving force receiving portion coupleable with the driving force applying member for driving the photosensitive drum to rotate and a braking force receiving portion engageable with the braking force applying member for receiving a braking force for a load against rotation of the coupling member, that is, the coupling member can receive the driving force and the braking force from the driving unit at the same time, torque required for rotation of the photosensitive drum can be increased, and thus fluctuation in speed of the photosensitive drum is suppressed, and rotation of the photosensitive drum is more stable. However, the structure of the first coupling member for receiving the driving force and the braking force in the process cartridge of the related art is complicated, which leads to an increase in manufacturing costs of the process cartridge.

Disclosure of utility model

In order to solve the problems, the utility model provides a novel processing box, which is mainly realized by the following technical scheme:

a process cartridge, comprising:

a frame;

A photosensitive drum rotatably supported on the frame and rotatable about a photosensitive drum rotation axis extending in a first direction;

a first coupling member connected to a first end of the photosensitive drum in a first direction, the first coupling member being capable of receiving an external force and driving the photosensitive drum to rotate; the first coupling member includes a first protrusion including:

a first surface extending in a first direction toward a direction away from the photosensitive drum;

A second surface located on a downstream side of the first surface in a rotation direction of the first coupling member, the second surface extending in a direction away from the photosensitive drum and being arranged obliquely with respect to the first direction;

a third surface along which a distance from the first end of the photosensitive drum to the third surface, measured in the first direction, decreases in an extension of the third surface in the rotational direction of the first coupling member;

The start position of the third surface extending in the rotational direction of the first coupling member is flush with or downstream of the first surface in the rotational direction of the first coupling member.

Further, in the rotational direction of the first coupling member, the third surface extends to a termination position adjacent to the second surface.

Further, the first coupling member further includes a second protrusion including a protrusion surface extending in the rotational direction of the first coupling member and facing away from the photosensitive drum side in the first direction, the protrusion surface being arranged on the upstream side of the third surface and spaced apart from the third surface in the rotational direction of the first coupling member.

Further, the downstream end of the protrusion surface in the rotation direction of the first coupling member has a first distance point, measured in a direction perpendicular to the first direction, which is the furthest point on the protrusion surface from the rotation axis of the first coupling member, and after projection in the first direction, a first line segment is made connecting the first distance point and a point located at the upstream end of the third surface in the rotation direction of the first coupling member, the shortest length of the first line segment being K, wherein 0mm < K < 4mm.

Further, in the first direction, a downstream end of the protrusion surface in the rotational direction of the first coupling member and an upstream end of the third surface in the rotational direction of the first coupling member are flush or further away from the photosensitive drum than an upstream end of the third surface in the rotational direction of the first coupling member.

Further, the protrusion surface includes a fourth surface and a fifth surface that are adjacently disposed, the fourth surface being disposed on an upstream side of the fifth surface in a rotation direction of the first coupling member, a distance from the first end of the photosensitive drum to the fourth surface measured in a first direction increasing along an extension of the fourth surface in the rotation direction of the first coupling member, the fifth surface being configured as a plane perpendicular to the first direction.

Further, the first coupling member further includes a shutter surface extending around the rotational axis of the first coupling member, projected along a first direction, the shutter surface and the fourth surface having overlapping portions, the shutter surface being flush with the fifth surface in the first direction.

Further, the first coupling member further includes a second protrusion located on an upstream side of the first protrusion in a rotation direction of the first coupling member, the second protrusion including a protrusion surface extending in the rotation direction of the first coupling member and facing away from the photosensitive drum side in a first direction, the first coupling member further including a groove formed on the second protrusion, the groove being provided closer to the photosensitive drum than the protrusion surface in the first direction.

Further, the first coupling member further includes a fourth surface disposed on a downstream side of the second surface in a rotation direction of the first coupling member, a distance from the first end of the photosensitive drum to the fourth surface measured in the first direction increases along an extension of the fourth surface in the rotation direction of the first coupling member, and a second line segment perpendicular to the first direction and connecting the third surface and the fourth surface is made, the second line segment having a shortest distance M, wherein 1mm < M < 4mm.

Further, in the rotation direction of the first coupling member, the upstream end of the third surface has a first point, in the rotation direction of the first coupling member, the downstream end of the third surface has a second point, measured in a direction perpendicular to the first direction, the first point and the second point are the furthest points on the third surface from the rotation axis of the first coupling member, a third line segment connecting the first point and the second point is made, and the length of the third line segment is W, wherein 3mm < W < 4mm.

In the process cartridge of the present utility model, on the premise of ensuring stable engagement of the first coupling member with the driving force applying member and the braking force applying member of the image forming apparatus, on the one hand, by reducing the curved surface inclined surface structure in the first coupling member, the structure of the first coupling member is simplified, and the yield is improved; on the other hand, the production cost is reduced by reducing the material usage amount; in still another aspect, the first coupling member is configured to be telescopic, so that coupling stability between the first coupling member and the driving unit can be improved.

Drawings

FIG. 1 is a schematic view of a process cartridge of the present utility model before being mounted in a tray;

FIG. 2 is a schematic view of the process cartridge of the present utility model when mounted in a tray;

FIG. 3 is a schematic view of the process cartridge and tray of the present utility model installed in an image forming apparatus;

FIG. 4 is a schematic view of the first driving unit force receiver in a first position according to the present utility model;

FIG. 5 is a schematic view of the first driving unit force receiver in the second position according to the present utility model;

Fig. 6 is a schematic view showing separation of the driving force applying member and the braking force applying member in the present utility model;

FIG. 7 is an exploded view of the first drive unit of the present utility model;

Fig. 8 is a schematic view of the positional relationship of the process cartridge and the image forming apparatus when the door is in the open position in the present utility model;

fig. 9 is a schematic view of the positional relationship of the process cartridge and the image forming apparatus when the door is in the closed position in the present utility model;

FIG. 10 is an enlarged partial schematic view of the mating relationship of the image forming apparatus and the process cartridge of the present utility model;

FIG. 11 is a schematic view of a process cartridge according to the present utility model at an angle;

FIG. 12 is another angular schematic view of a process cartridge of the present utility model;

FIG. 13 is a schematic view of a further angle of the process cartridge of the present utility model;

FIG. 14 is a schematic view of the present utility model with the developer unit and drum unit separated;

FIG. 15 is a schematic view of a drum unit of the present utility model;

FIG. 16 is an exploded schematic view of the drum unit of the present utility model;

FIG. 17 is a first perspective view of a first coupling member of the present utility model;

FIG. 18 is a second perspective view of the first coupling member of the present utility model;

FIG. 19 is a third perspective view of the first coupling member of the present utility model;

FIG. 20 is a fourth schematic view of the first coupling member of the present utility model;

FIG. 21 is a fifth perspective view of the first coupling member of the present utility model;

FIG. 22 is a sixth perspective view of the first coupling member of the present utility model;

FIG. 23 is a schematic view of the first coupling member and force receiver engagement of the present utility model;

Fig. 24 is a schematic view of another embodiment of the first coupling member of the present utility model.

Detailed Description

For better description and understanding of the process cartridge 100 in the present utility model, the present utility model will define various directions of the process cartridge 100, wherein the longitudinal direction of the process cartridge 100 is the left-right direction (first direction), and the first coupling member 610 is provided at the right end (first end) of the process cartridge 100 in the left-right direction; the process cartridge 100 is mountable into the image forming apparatus 1 in a direction from the rear to the front; the up-down direction is perpendicular to the front-back direction and the left-right direction.

As shown in fig. 1 to 24, there are shown an image forming apparatus 1 of the related art and a process cartridge 100 of the present utility model detachably mounted in the image forming apparatus 1, and the image forming apparatus 1 and the process cartridge 100 will be described in detail below, respectively, with reference to the specific drawings.

[ Image Forming apparatus ]

As shown in fig. 1 to 10, there is shown an image forming apparatus 1 of the prior art, the image forming apparatus 1 including a hollow accommodating chamber 2, a tray 3 slidable in a front-rear direction and mounted into the accommodating chamber 2, and a door cover 4, the door cover 4 being rotatable between an open position where the accommodating chamber 2 can be exposed and a closed position where the accommodating chamber 2 is covered, the tray 3 being mountable in the accommodating chamber 2 of the image forming apparatus 1 in a rear-front direction with the process cartridge 100 supported; a transfer belt that can transfer an image on the process cartridge 100 onto a sheet is also provided at the lower end of the tray 3, and can move upward and downward in accordance with the opening/closing operation of the door 4, and in a state in which the process cartridge 100 is mounted in the tray 3, the transfer belt and the photosensitive drum 603 can come into and out of contact with each other in accordance with the opening/closing operation of the door 4.

The image forming apparatus 1 further includes a rotatable first driving unit 8 and a second driving unit 9 provided on a right end wall of the accommodating chamber 2, the first driving unit 8 being operable to drive a photosensitive drum 603 (to be described in detail later) of the process cartridge 100 to rotate, and the second driving unit 9 being operable to drive a developing roller 104 (to be described in detail later) of the process cartridge 100 to rotate, elastic members being connected to each of the first driving unit 8 and the second driving unit 9, and the first driving unit 8 and the second driving unit 9 being retractable and extendable in accordance with an opening/closing operation of the door cover 4 to avoid interference with the process cartridge 100; the first drive unit 8 includes a driving force applying member 10 and a braking force applying member 20, the braking force applying member 20 being provided inside the driving force applying member 10, both being rotatable about the same axis.

The driving force applying member 10 is rotatably driven by a driving assembly in the image forming apparatus 1, an elastic piece is connected to a right end portion of the driving force applying member 10, the driving force applying member 10 includes a pair of driving protrusions 14 disposed at 180-degree intervals, the driving protrusions 14 include driving surfaces 14a facing a downstream side in a rotation direction of the driving force applying member 10, and the driving surfaces 14a are operable to be coupled as driving portions with a first coupling member 610 (to be described later) of the process cartridge 100 to drive the first coupling member 610 to rotate.

The braking force applying member 20 includes a force receiving piece rotatable relative to the driving force applying member 10 in a rotational direction of the driving force applying member 10 from between a first position near one of the driving protrusions 14 of fig. 4 and a second position far from one of the driving protrusions 14 of fig. 5; the force receiving member includes a first force receiving member 20a and a second force receiving member 20b mounted to each other and rotatable together, the first force receiving member 20a and the second force receiving member 20b each being provided with a force receiving claw 21 exposed to the outside of the first driving unit 8 and rotatable together by receiving an external rotational force, the force receiving claw 21 being operatively connected to a damper 44, the damper 44 being configured to rotate together with the force receiving claw 21, the damper 44 being driven to rotate to generate damping and to transmit the damping to the force receiving claw 21 of the force receiving member, and the braking force applying member 20 further includes a spring 42 which applies an elastic force of compression accumulation thereof to the force receiving member to keep the force receiving claw 21 of the force receiving member in an extended position.

Pressing members 5 are further provided on the upper side of the left end and the upper side of the right end of the housing chamber 2 of the image forming apparatus 1, respectively, the pressing members 5 being movable upward or downward according to the opening/closing operation of the door cover 4 and being capable of pressing the process cartridge 100; furthermore, the image forming apparatus 1 further includes a positioning member 7 provided adjacent to the pressing member 5 at the right end, the positioning member 7 being movable upward or downward as well when the door 4 is opened/closed, the positioning member 7 being movable downward when the door 4 is closed, and being inserted into a position in the gap portion 8 formed by the process cartridge 100 and the right side wall of the accommodating chamber 2, so that the process cartridge 100 can be stably positioned in the image forming apparatus 1 in the left-right direction.

[ Process cartridge ]

Next, the process cartridge 100 in the present utility model will be described in detail, as has been described above, the process cartridge 100 being detachably mounted to the image forming apparatus 1 in the related art, and as particularly shown in fig. 1 to 17, the process cartridge 100 comprising a developing unit and a drum unit connected to each other, wherein the developing unit comprises a developing frame 101 which can contain a developer and a developing roller 104 which is supported on the developing frame 101 and can carry the developer, a powder feeding roller (not shown), the developing unit being further provided with a first electrode 171, the first electrode 171 having a first electrode electrical contact surface which can be electrically connected to a power supply member of the image forming apparatus 1, the first electrode electrical contact surface being provided on a left end portion of the developing unit and being in elastic contact with the power supply member and being configured to urge the first electrode electrical contact surface of the first electrode 171 from left to right, the process cartridge 100 is forced to push toward the right, and therefore, the first coupling member 610 and the second coupling member 109 of the process cartridge 100 will remain stably coupled with the image forming apparatus, the possibility that the first coupling member 610 and the second coupling member 109 are decoupled from the first driving unit 8 and the second driving unit 9 can be avoided to some extent, and preferably, the first electrode 171 is disposed at the left end portion of the developing unit, and the first electrode 171 can transmit and supply this power to and from the developing roller 104 and the toner feeding roller, that is, the first electrode 171 is electrically connected to the developing roller 104 and the toner feeding roller, and the second coupling member 109 is further disposed at the right end of the developing unit, and the second coupling member 109 can be coupled with the second driving unit 9 of the image forming apparatus 1 to receive the driving force output thereof, so that the developing roller 104 and the toner feeding roller can be driven to rotate.

The drum unit includes a drum frame 102, a photosensitive drum 603 supported on the drum frame 102 and capable of forming an electrostatic latent image, and a charging roller 105 which is in contact with the photosensitive drum 603 and capable of charging the photosensitive drum 603, as shown in fig. 15 to 16, a containing chamber containing waste developer is not provided in the drum frame 102, and after development imaging is completed, developer which does not participate in development imaging is recovered in the image forming apparatus by a transfer belt of the image forming apparatus, and therefore, this contributes to downsizing of the process cartridge 100, and downsizing of the developing cartridge is facilitated.

The process cartridge 100 is further provided with a second electrode 170 having a second electrode electrical contact surface provided at the left upper end portion of the process cartridge 100, preferably, the second electrode 170 is provided at the left upper end portion of the drum frame 102 of the process cartridge 100, the second electrode 170 is configured to be electrically connectable with a power supply member at the upper end in the image forming apparatus 1 and to be able to supply the electric power to the charging roller 105, that is, the second electrode 170 is electrically connectable to the charging roller 105, and when the process cartridge 100 is mounted in the image forming apparatus 1 and the door cover 4 is closed, the power supply member is in elastic contact with the second electrode 170 and is configured to apply a pressing force downward to the second electrode 170, that is, the elastic force is able to urge the process cartridge 100 from above downward to the tray 3, so that the process cartridge 100 is further stably positioned on the tray 3, the shake of the process cartridge 100 and the first driving unit 8 and the second driving unit 9 during coupling is reduced, and the coupling stability is improved; furthermore, the process cartridge 100 further includes a chip 106 having a chip electrical contact surface 106a provided at an upper end portion of the left side of the process cartridge 100, which is provided at a distance from the first electrode electrical contact surface of the first electrode 171 in the front-rear direction and at a position closer to the front end of the process cartridge 100 with respect to the first electrode, and in the first direction, the first electrode electrical contact surface of the first electrode 171 is provided at a position closer to the right end of the drum frame 102 than the chip electrical contact surface 106a, the chip electrical contact surface 106a being electrically contactable to the image forming apparatus 1 so that the chip 106 can establish a communication connection with the image forming apparatus 1, whereby information such as a model number, a developer capacity, etc. of the process cartridge 100 stored in the chip 106 can be read by the image forming apparatus 1, the image forming apparatus 1 is held in elastic contact with the chip electrical contact surface 106a of the chip 106, and is configured to apply downward pressure to the chip electrical contact surface 106a of the chip 106, that is, from the upper pressing down the process cartridge 100 to the tray 3, so that the process cartridge 100 is positioned further stably on the tray 3, the driving unit 8 is reduced in the driving coupling stability with the first driving unit 9; moreover, the process cartridge 100 is capable of stably connecting the first electrode electrical contact surface of the first electrode 171, the second electrode electrical contact surface of the second electrode 170, and the chip electrical contact surface of the chip 106 to the imaging device 1 by arranging the first electrode electrical contact surface of the first electrode 171, the second electrode electrical contact surface of the second electrode 170, and the chip electrical contact surface of the chip 106 on the left side of the process cartridge 100, that is, on the different sides of the first coupling member 610 and the second coupling member 109 in the longitudinal direction of the process cartridge 100, such that the first electrode electrical contact surface of the first electrode 171, the second electrode electrical contact surface of the second electrode 170, and the chip electrical contact surface of the chip 106 can be separated from the first coupling member 610 and the second coupling member 109 as far as possible in the left-right direction from the first coupling member 610 and the second coupling member 109, respectively, when coupled to the imaging device 1, and the first coupling member 610 and the second coupling member 109 can be caused by rotation, and therefore, the shake on the left side of the process cartridge 100 can be made lower than the shake on the right side of the first coupling member 610 and the second coupling member 109, and the first electrode electrical contact surface of the second electrode 170 arranged on the left side of the process cartridge 100 can be connected to the chip electrical contact surface of the imaging device more stably when coupled to the imaging device 1.

When the process cartridge 100 performs an image forming operation, the developer carried on the developing roller 104 can be conveyed onto the photosensitive drum 603 so as to be used for developing the electrostatic latent image on the photosensitive drum 603, and the formed developer image can be transferred onto a sheet by the transfer belt in the image forming apparatus 1, thereby completing one cycle of the image forming operation; the first coupling member 610 is connected to the right end portion of the photosensitive drum 603, and the first coupling member 610 is couplable with the driving force applying member 10 of the first driving unit 8 of the image forming apparatus 1 to be able to receive the driving force output therefrom, so that the photosensitive drum 603 can be driven to rotate.

As shown in fig. 17 to 24, the first coupling member 610 includes a pair of first protrusions 614 (driven protrusions) disposed at substantially 180 degrees apart in the circumferential direction, the first protrusions 614 including a first surface 614a (driven surface) extending in a first direction toward a direction away from the photosensitive drum 603 and substantially parallel to the first direction and a second surface 614b located on a downstream side of the first surface 614a in the rotational direction of the first coupling member 610; wherein the first surface 614a is a surface facing the upstream side in the rotational direction of the first coupling member 610, the first surfaces 614a of the pair of first protrusions 614 matingly engage with the driving surfaces 14a of the pair of driving protrusions 14 of the driving force applying member 10 so as to be able to receive the driving force transmitted by the driving force applying member 10, so that the first coupling member 610 can rotate the photosensitive drum 603, that is, the first coupling member 610 can receive the driving force transmitted by the first driving unit 8 by the coupling of the first protrusions 614 with the driving protrusions 14 of the driving force applying member 10; the second surface 614b is configured to extend in a first direction toward a direction away from the photosensitive drum 603 and is disposed to intersect the first direction, and the second surface 614b is engageable with the force receiving claw 21 of the braking force receiving member 20, so that the first driving unit 8 and the first coupling member 610 are prevented from being greatly moved in the left-right direction and even decoupled, and coupling stability therebetween is affected.

The first projection 614 further includes a third surface 614c (the third surface 614c may also be configured as a stepped surface as shown in fig. 24) extending from the first surface 614a or from the downstream side of the first surface 614a to the adjacent second surface 614b in the rotational direction of the first coupling member 610 so that the third surface 614c is as close to the second surface 614b as possible in the rotational direction of the first coupling member 610, thereby providing a longer guide distance for the force receiving claw 21, improving the coupling success rate of the first coupling member 610 and the force receiving claw 21, in other words, the starting position where the third surface 614c extends in the rotational direction of the first coupling member 610 is flush with the first surface 614a or is located at the downstream side of the first surface 614 a.

The first coupling member 610 further includes a second protrusion 624 protruding from the surface 611 in a direction away from the photosensitive drum 603, the second protrusion 624 being disposed at a distance from the first protrusion 614 in the rotational direction of the first coupling member 610; in particular, the second protrusion 624 includes a second protrusion surface 631 extending in the rotational direction of the first coupling member 610 and facing away from the photosensitive drum 603 side in the first direction, the second protrusion surface 631 being disposed on the upstream side of the third surface 614c and spaced apart from the third surface 614c in the rotational direction of the first coupling member 610, i.e., traveling in the rotational direction of the first coupling member 610, the downstream side end of the second protrusion surface 631 being spaced from the upstream side end of the third surface 614c by a distance, in other words, the second protrusion surface 631 does not abut the third surface 614c, and if the gap 630 is made smaller in this case (the gap 630 between the second protrusion surface 631 and the third surface 614 c), the force pawl 21 will not catch when in contact with or sliding on the second protrusion surface 631 and the third surface 614c in sequence, the structure in this embodiment will also serve as a guide for guiding the force pawl 21 to engage the guide member with the second surface 614b, and the coupling member can be made of a more cost-effective structure than the second surface 614c is also limited by the presence of the coupling member, and the structure can be made of a more cost-effective coupling member than the third surface 614.

As can be understood from the above description, the gap 630 is provided between the second protrusion surface 631 and the third surface 614c with a certain distance between the downstream side end of the second protrusion surface 631 and the upstream side end of the third surface 614c in the rotation direction of the first coupling member 610, the downstream end of the second protrusion surface 631 in the rotation direction of the first coupling member 610 has a first distance point, measured in the direction perpendicular to the first direction, which is the furthest distance point on the second protrusion surface 631 to the rotation axis of the first coupling member 610, and after projection in the first direction, a first line segment is made connecting the first distance point and the upstream end of the third surface 614c in the rotation direction of the first coupling member 610, the shortest length of which is K, wherein 0mm < K < 4mm; further 0.5mm < K < 2mm, so as to avoid that the material requirement of the first coupling member 610 cannot be significantly reduced when K is sufficiently small, and avoid that the force claw 21 cannot pass through the gap 630 after being separated from the fourth surface 624d when K is sufficiently large, so that the force claw 21 is blocked in the gap 630.

The second protruding portion surface 631 includes a fourth surface 624d and a fifth surface 624c that are adjacently arranged, the fifth surface 624c being disposed on the downstream side of the fourth surface 624d and being located at the downstream end of the second protruding portion surface 631 in the rotational direction of the first coupling member 610, a distance from the first end of the photosensitive drum 603 to the fourth surface 624d, measured in the first direction, increasing along the extension of the fourth surface 624d in the rotational direction of the first coupling member 610, defining an angle β1 of the fourth surface 624d to the surface 611 and an angle β2 of the fifth surface 624c to the surface 611, wherein β2 < β1, to ensure that the force receiving claw 21 provides a greater sliding speed when sliding from the fourth surface 624d having a greater inclination angle to the fifth surface 624c having a smaller inclination angle, ensuring that the force receiving claw 21 can cross the gap 630; further, the fifth surface 624c is configured as a plane perpendicular to the left-right direction, which can reduce the slope configuration, simplify the structure of the first coupling member 610, and can provide a greater sliding speed when the force-receiving claw 21 slides out of the fifth surface 624c configured as a slope to the planar fourth surface 624d, further ensuring that the force-receiving claw 21 can cross the gap 630.

The first coupling member 610 further includes a pair of shutter portions 617 extending around the rotational axis of the first coupling member 610, the shutter portions 617 being operable to block the force-receiving pawls 21, a gap 616 being formed between shutter surfaces 617a of the pair of shutter portions 617 when viewed from right to left, the gap 616 communicating the left and right sides of the shutter portions 617 and allowing the force-receiving pawls 21 to enter.

In the first direction, the downstream end of the second projection surface 631 in the rotational direction of the first coupling member 610 and the upstream end of the third surface 614c in the rotational direction of the first coupling member 610 are flush with each other or are farther from the photosensitive drum 603 than the upstream end of the third surface 614c in the rotational direction of the first coupling member 610, and the fifth surface 624c is provided so as not to be farther from the photosensitive drum 603 than the shutter surface 617a of the shutter portion 617, which is effective in avoiding the problem that the force receiving claw 21 is blocked by the upstream end of the third surface 614c after coming out of contact with the fifth surface 624c, and the problem that the force receiving claw 21 is blocked by the fifth surface 624c after coming out of contact with the shutter surface 617a of the shutter portion 617; preferably, the fifth surface 624c is disposed farther from the photosensitive drum 603 than the upstream-side end of the third surface 614c, and the fifth surface 624c and the shutter surface 617a of the shutter portion 617 are substantially flush to form a height difference between the third surface 614c and the fifth surface 624c in the left-right direction, and the force-receiving claw 21 smoothly enters the fifth surface 624c after coming out of contact with the shutter surface 617a of the shutter portion 617 and stably passes over the gap 630 after coming out of contact with the fifth surface 624 c.

As can be appreciated from the foregoing embodiments, the fourth surface 624d is configured as an inclined surface substantially in the same direction as the inclined direction of the second surface 614b, the second surface 614b is an inclined surface which gradually moves away from the photosensitive drum 603 as the second surface 614b moves downstream in the rotational direction, and the fourth surface 624d is also an inclined surface which gradually moves away from the photosensitive drum 603 as the fourth surface 624d moves downstream in the rotational direction, and it is preferable that the upstream end of the fourth surface 624d abuts the surface 611; when the force-receiving claw 21 comes out of contact with the third surface 614c of the first projection 614 and fails to engage with the second surface 614b successfully, the fourth surface 624d abutting the face 611 may guide the force-receiving claw 21 into contact with the third surface 614c of the other first projection 614, and eventually the force-receiving claw 21 may be guided again by the third surface 614c into engagement with the second surface 614 b.

Further, in the rotational direction of the first coupling member 610, the upstream end of the first protrusion 614 has a side surface facing the upstream side of the first coupling member 610, on which the first surface 614a is provided, and a protrusion (not shown) is formed protruding from the side surface toward the upstream side of the first coupling member 610 to further strengthen the use strength of the first protrusion 614, avoiding breakage of the first protrusion 614 after being forced.

Further, as shown in fig. 19, a groove 625 is also formed on the second protrusion 624 of the first coupling member 610, the groove 625 is configured as a groove recessed from the radially outer peripheral surface of the second protrusion 625 toward the first rotational axis near the first coupling member 610, the groove 625 is provided at a position closer to the photosensitive drum 631 than the second protrusion surface 631 in the first direction, and in particular, the groove 625 is provided between the fourth surface 624d and the face 611, and after such a configuration is adopted, the material requirement of the first coupling member 610 is further saved, and the production cost is further reduced.

Further, the gap 616 and the third surface 614c have overlapping portions, which facilitates easier entry of the force-receiving pawl 21 from the gap 66 to be guided by the third surface 614c and thus more easily engage the second surface 614 c.

Further, a second line segment perpendicular to the first direction and connecting the third surface 614c and the fourth surface 624d is made, the shortest distance of the second line segment is M, wherein 1mm < M < 4mm, so as to ensure that the groove formed between the second surface 614b and the fourth surface 624d is large enough, improve the fault tolerance of the force-bearing claw 21 against the second surface 614b, and avoid that the force-bearing claw 21 is difficult to enter the groove formed between the fourth surface 624d and the second surface 614b when the distance between the two is too small, otherwise, the force-bearing claw 21 is easy to be guided away by the fourth surface 624d to be difficult to be engaged in the process of being engaged with the second surface 614 b; more preferably, 2mm < M < 3mm; in other words, when the first side of the free end of the force-receiving claw 21 (i.e., the surface facing the second surface 614b in the rotational direction of the first coupling member 610) abuts on the second surface 614b, the second side of the free end of the force-receiving claw 21 (i.e., the surface facing the fourth surface 624d in the rotational direction of the first coupling member 610) is spaced apart from the fourth surface 624d by a distance V, wherein 0 < V < 2mm, preferably 0.1 < V < 1mm.

Further, there is a first point at the upstream end of the third surface 614c in the rotational direction of the first coupling member 610, a second point at the downstream end of the third surface 614c in the rotational direction of the first coupling member 610, both the first and second points being the furthest points on the third surface 614c from the rotational axis of the first coupling member 610 measured in the direction perpendicular to the first direction, a third line segment connecting the first point and the second point being made, the length of the third line segment being W, wherein 3mm < W < 4mm, wherein on the one hand, in order to avoid the problem that the extension length of the third surface 614c is too small to function as a better guide for the force pawl 21 when W is too small, and on the other hand, the groove size between the fourth surface 624d and the second surface 614b is also compressed when W is too large, resulting in difficulty in entering the force pawl 21 and affecting engagement of the force pawl 21 with the second surface 614 b.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims (10)

1. A process cartridge, comprising:

a frame;

A photosensitive drum rotatably supported on the frame and rotatable about a photosensitive drum rotation axis extending in a first direction;

a first coupling member connected to a first end of the photosensitive drum in a first direction, the first coupling member being capable of receiving an external force and driving the photosensitive drum to rotate; the first coupling member includes a first protrusion including:

a first surface extending in a first direction toward a direction away from the photosensitive drum;

A second surface located on a downstream side of the first surface in a rotation direction of the first coupling member, the second surface extending in a direction away from the photosensitive drum and being arranged obliquely with respect to the first direction;

a third surface along which a distance from the first end of the photosensitive drum to the third surface, measured in the first direction, decreases in an extension of the third surface in the rotational direction of the first coupling member;

wherein the third surface extends in a starting position flush with or downstream of the first surface in a rotational direction of the first coupling member.

2. A process cartridge according to claim 1, wherein in a rotation direction of said first coupling member, a termination position where said third surface extends is adjacent to said second surface.

3. A process cartridge according to claim 1, wherein said first coupling member further includes a second projection including a projection surface extending in a rotation direction of said first coupling member and facing away from a side of said photosensitive drum in a first direction, said projection surface being disposed on an upstream side of said third surface and spaced apart from said third surface in the rotation direction of said first coupling member.

4. A process cartridge according to claim 3, wherein a downstream end of said protrusion surface in a rotation direction of said first coupling member has a first distance point, measured in a direction perpendicular to the first direction, which is a farthest distance point from the rotation axis of said first coupling member on said protrusion surface, and after projection in the first direction, a first line segment connecting said first distance point and a point located at an upstream end of said third surface in the rotation direction of said first coupling member is made, a shortest length of said first line segment being K, wherein 0mm < K < 4mm.

5. A process cartridge according to claim 3, wherein in the first direction, a downstream end of said projection surface in the rotation direction of said first coupling member and an upstream end of said third surface in the rotation direction of said first coupling member are flush or are farther from said photosensitive drum than an upstream end of said third surface in the rotation direction of said first coupling member.

6. A process cartridge according to claim 3, wherein said projection surface includes a fourth surface and a fifth surface provided adjacently, said fourth surface being disposed on an upstream side of said fifth surface in a rotation direction of said first coupling member, a distance from said first end of said photosensitive drum to said fourth surface measured in a first direction increasing along an extension of said fourth surface in the rotation direction of said first coupling member, said fifth surface being configured as a plane perpendicular to the first direction.

7. The process cartridge of claim 6, wherein the first coupling member further comprises a shutter surface extending about an axis of rotation of the first coupling member, the shutter surface and the fourth surface having overlapping portions, the shutter surface being flush with the fifth surface in the first direction, as projected in the first direction.

8. A process cartridge according to claim 1, wherein said first coupling member further includes a second projection located on an upstream side of said first projection in a rotation direction of said first coupling member, said second projection including a projection surface extending in the rotation direction of said first coupling member and facing away from said photosensitive drum side in a first direction, said first coupling member further including a groove formed on said second projection, said groove being provided closer to said photosensitive drum than said projection surface in the first direction.

9. A process cartridge according to claim 1, wherein said first coupling member further comprises a fourth surface disposed on a downstream side of said second surface in a rotation direction of said first coupling member, a distance from said first end of said photosensitive drum to said fourth surface measured in the first direction increasing along an extension of said fourth surface in the rotation direction of said first coupling member, a second line segment perpendicular to the first direction and connecting said third surface and said fourth surface, said second line segment having a shortest distance M, wherein 1mm < M < 4mm.

10. A process cartridge according to claim 1, wherein an upstream end of said third surface has a first point in a rotation direction of said first coupling member, a downstream end of said third surface has a second point in a rotation direction of said first coupling member, and said first point and said second point are both furthest points on said third surface from a rotation axis of said first coupling member measured in a direction perpendicular to said first direction, a third line segment connecting said first point and said second point is made, said third line segment having a length W, wherein 3mm < W < 4mm.