CN117647920A

CN117647920A - Processing box

Info

Publication number: CN117647920A
Application number: CN202311118174.3A
Authority: CN
Inventors: 罗琴; 靳杨; 陈名栋
Original assignee: Zhuhai Nastar Information Technology Co ltd
Current assignee: Zhuhai Nastar Information Technology Co ltd
Priority date: 2022-09-02
Filing date: 2023-08-31
Publication date: 2024-03-05
Also published as: CN220691263U

Abstract

The present application relates to a process cartridge detachably mountable to an electronic image forming apparatus, the process cartridge including: a developing unit provided with a developing frame and a rotatable developing roller, a drum unit provided with a drum frame and a rotatable photosensitive drum movable in a third direction relative to the electronic image forming apparatus to contact with or separate from a transfer belt of the electronic image forming apparatus, and a separating unit; the separation unit is used for receiving the acting force of the developing separation control unit of the electronic imaging device so as to drive the photosensitive drum to move along a third direction; the process cartridge has a contact state and a release state, the photosensitive drum is in contact with the transfer belt when the process cartridge is in the contact state, and the photosensitive drum is released from the transfer belt when the process cartridge is in the release state. In this application, drive the sensitization drum through the separation unit along the third direction motion, can make sensitization drum and transfer printing area break away from to prevent to produce great friction between sensitization drum and the transfer printing area, avoid damaging transfer printing area and sensitization drum self.

Description

Processing box

Technical Field

The application relates to the field of printing technology, in particular to a processing box.

Background

The process cartridge is a consumable material detachably mountable to an electronic image forming apparatus. The processing box comprises a photosensitive drum and a developing roller, wherein the end part of the photosensitive drum is provided with a photosensitive coupling, and the end part of the developing roller is provided with a developing coupling. The electronic imaging device is provided with a photosensitive driving head and a developing driving head, wherein the photosensitive driving head can be engaged with the photosensitive coupler to drive the photosensitive drum to rotate; the developing drive head can be engaged with the developing coupling to drive the developing roller to rotate, i.e., the process cartridge adopts a dual drive structure.

In order to simplify the structure of the process cartridge, a single driving structure is adopted instead of a double driving structure, that is, the photosensitive coupling does not receive driving force from the photosensitive driving head or is not provided with the photosensitive coupling, and the photosensitive drum rotates under the driving of the developing coupling. However, with the process cartridge employing the single drive structure, when developing a black image alone, the developing drive head corresponding to the color process cartridge does not rotate, and the photosensitive drum is in a stationary state, so that the photosensitive drum of the color process cartridge may generate great friction with the transfer belt in the electronic image forming apparatus, and the transfer belt and the photosensitive drum themselves are easily damaged.

Disclosure of Invention

The present application provides a process cartridge for solving the problem that a photosensitive drum of a color process cartridge may generate a large friction with a transfer belt when developing a black image alone.

The embodiment of the application provides a process cartridge, process cartridge detachably installs in electronic imaging device, process cartridge includes:

a developing unit provided with a developing frame and a rotatable developing roller;

a drum unit provided with a drum frame and a rotatable photosensitive drum movable in a third direction with respect to the electronic image forming apparatus to contact or separate from a transfer belt of the electronic image forming apparatus;

The separation unit is used for receiving the acting force of the developing separation control unit of the electronic imaging device so as to drive the photosensitive drum to move along a third direction;

wherein the process cartridge has a contact state and a release state, the photosensitive drum is in contact with the transfer belt when the process cartridge is in the contact state, and the photosensitive drum is released from the transfer belt when the process cartridge is in the release state.

In one possible design, the end of the drum frame is provided with a drive side end cap;

the separation unit including the activity set up in the first separation subassembly of drive side end cover, first separation subassembly includes:

a first pressing member for rotating relative to the driving-side end cap after receiving the force of the developing separation control unit;

the movable piece is sleeved at the end part of the photosensitive drum, the movable piece is abutted to the first pushing piece, and the first pushing piece can drive the movable piece and the photosensitive drum to move along a third direction through rotation.

In one possible design, the first pressing member is provided with a first protrusion and a second protrusion protruding from the driving-side end cap, the first protrusion being for receiving a force of a first force application portion of the developing separation control unit, the second protrusion being for receiving a force of a second force application portion of the developing separation control unit;

The first pushing member rotates in opposite directions when the first protrusion receives the urging force of the first urging portion and when the second protrusion receives the urging force of the second urging portion.

In one possible design, the first pushing member is further provided with a locking portion that is locked with the driving-side end cap for fixing the first pushing member when the process cartridge is in the contact state or the release state.

In one possible design, the drive-side end cap is provided with a fulcrum, and the first pushing member is provided with a shaft hole, and the fulcrum is rotatably connected with the shaft hole.

In one possible design, the driving side end cover is provided with an elliptical first through hole, and at least part of the movable piece is accommodated in the first through hole so as to limit the movement of the movable piece in the first direction and/or the second direction;

the driving side end cover is further provided with a first limiting part, the movable piece is provided with a limited part, and the first limiting part is matched with the limited part so as to limit the movement of the movable piece along a third direction.

In one possible design, the separation unit comprises:

the force receiving piece is arranged on the developing unit and is used for receiving the acting force of the developing separation control unit so as to drive the developing unit to rotate;

And the second separation assembly is arranged on the drum unit, and the developing unit can drive the second separation assembly to move so as to drive the photosensitive drum to move along a third direction.

the second separation assembly includes:

one end of the elastic piece is connected with the photosensitive drum, the other end of the elastic piece is connected with the driving side end cover, and the elastic piece can drive the photosensitive drum to be far away from the transfer belt along a third direction;

the second pushing piece, the one end of second pushing piece is provided with pushing part, pushing part with the photosensitive drum butt, developing unit rotation can drive the second pushing piece is along first direction or third direction motion to promote or dodge the motion of photosensitive drum along the third direction.

In one possible design, the second pushing member is provided with a first protrusion and a second protrusion, the first protrusion is provided with a first contact surface, and the second protrusion is provided with a second contact surface;

the end part of the developing frame is provided with a developing protecting cover, and the developing protecting cover is provided with a third contact surface capable of being abutted with the first contact surface and a fourth contact surface capable of being abutted with the second contact surface;

The developing unit rotation can cause the third contact surface to apply a force to the first contact surface or the fourth contact surface to apply a force to the second contact surface, and the second urging member rotates in the opposite direction when the third contact surface applies a force to the first contact surface and when the fourth contact surface applies a force to the second contact surface.

In one possible design, the first contact surface, the second contact surface, the third contact surface and the fourth contact surface are inclined surfaces inclined with respect to the first direction and/or the second direction and/or the third direction.

In one possible design, the end of the second pushing member away from the pushing portion is further provided with an elastic buckle, and the elastic buckle is clamped with the driving side end cover.

In one possible design, the end of the photosensitive drum is provided with: the device comprises a groove part, a round platform part and a guide surface, wherein the diameter of the groove part is smaller than that of the round platform part, and the guide surface is connected with the groove part and the round platform part;

when the processing box is in a contact state, the pushing part is abutted with the round table part, when the processing box is in a separation state, the pushing part is abutted with the groove part, and when the processing box is switched between the contact state and the separation state, the pushing part is abutted with the guide surface.

In one possible design, the end of the photosensitive drum is provided with: the round platform part, the pushing part with round platform part butt.

In one possible design, the driving side end cover is provided with a second limiting part, the pushing part is provided with a limiting part, and the second limiting part is matched with the limiting part, so that the movement of the second pushing part can be limited, and the second pushing part can move along the first direction or the third direction.

In one possible design, the end of the photosensitive drum is provided with: the round platform portion, round platform portion is kept away from be provided with first connecting portion on the terminal surface of sensitization drum, be provided with second connecting portion on the drive side end cover, elastic component one end with first connecting portion are connected, the other end with second connecting portion are connected.

In one possible design, the second pushing member is provided with a first section, a second section, and a third section extending in different directions to avoid the drum unit and the developing unit.

In one possible design, the separation unit comprises: the force receiving piece is arranged on the developing unit and is used for receiving the acting force of the developing separation control unit so as to drive the developing unit to rotate, and the developing unit drives the drum unit to move along a third direction so as to enable the drum unit to be switched between a separation state and a contact state.

In one possible design, the end of the developing unit is provided with a developing coupling;

the separation unit further includes: the shrinkage assembly can drive the developing coupling to shrink along the axial direction, and the reset piece can drive the developing coupling to extend along the axial direction;

wherein, the shrink assembly is connected with the power receiver, the power receiver can drive the shrink assembly motion.

In one possible design, the retraction assembly includes:

a connecting rod hinged with the force receiving member;

the first component is sleeved outside the developing coupler and is rotationally connected with the connecting rod, and the first component is provided with a first coupling part;

the second component is sleeved outside the developing coupling and arranged on one side of the first component away from the connecting rod, and the second component is provided with a second coupling part which can be abutted with the first coupling part;

when the first component rotates relative to the second component, the first coupling part pushes the second coupling part, so that the second component is far away from the first component along the axial direction, and the developing coupling is driven to shrink.

In one possible design, the first coupling portion has a first slope and the second coupling portion has a second slope, the first slope abutting the second slope.

In one possible design, the reset member is disposed between the development coupling and the development frame.

In one possible design, the developing unit is provided with a locking portion for cooperating with a tray assembly of the electronic image forming apparatus to hold the process cartridge in a disengaged state.

In one possible design, the developing roller is in contact with the photosensitive drum when the process cartridge is in the contact state and the release state.

In this application, when developing black image alone, drive the sensitization drum of color processing box through the separation unit along the third direction motion, can make the sensitization drum of color processing box break away from with the transfer printing area to prevent to produce great friction between the sensitization drum of color processing box and the transfer printing area, make the transfer printing area can rotate smoothly, in order to develop the work, avoid damaging transfer printing area and sensitization drum self.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

FIG. 1 is a schematic view of a process cartridge according to an embodiment of the present application;

FIG. 2 is a schematic view of the process cartridge of FIG. 1 at another angle;

FIG. 3 is an exploded view showing a part of the structure of the process cartridge of FIG. 1 in the first embodiment;

FIG. 4 is a side view of the process cartridge of FIG. 1 in a first embodiment;

FIG. 5 is a schematic view showing the structure of the outside of the driving side end cap of the process cartridge of FIG. 4;

FIG. 6 is a schematic view showing the structure of the inside of the driving side end cap of the process cartridge of FIG. 4;

fig. 7 is a schematic view of the structure of the process cartridge in fig. 1 in the second embodiment;

fig. 8 is an exploded view of a part of the structure of the process cartridge of fig. 7;

FIG. 9 is a schematic view of the structure of the photosensitive drum and the first gear portion of FIG. 8;

FIG. 10 is a schematic view of the force receiver of FIG. 8;

FIG. 11 is a schematic view of the developer cover of FIG. 8;

FIG. 12 is a schematic view of the cartridge of FIG. 7 in another view, with the drive side end cap omitted;

FIG. 13 is a schematic view of the process cartridge of FIG. 12 in another view;

fig. 14 is a schematic view of the structure of the process cartridge in fig. 1 in the third embodiment;

FIG. 15 is a schematic view of the process cartridge of FIG. 14 in another view;

fig. 16 is an exploded view of a part of the structure of the process cartridge of fig. 14;

Fig. 17 is a schematic structural view of a tray assembly in which the process cartridge is mounted to an electronic image forming apparatus;

FIG. 18 is an enlarged view of a portion of region I of FIG. 17;

fig. 19 is a schematic view of the structure of the process cartridge in fig. 1 in the fourth embodiment;

fig. 20 is a partial schematic structural view of the process cartridge of fig. 19.

Reference numerals:

a 100-developing unit;

110-a developing frame;

120-drive side bearings;

130-conductive side bearings;

140-a developing cover;

141-a third contact surface;

142-fourth contact surface;

150-a locking part;

a 200-drum unit;

210-drum frame;

220-photosensitive drums;

221-groove portions;

222-a round platform part;

223-first connection portion;

224—a guide surface;

230-drive side end cap;

231-a first via;

232-a second through hole;

233-fulcrum;

234-a first restriction;

235-a second restriction;

236-a second connection;

240-conductive side end caps;

300-photosensitive coupling;

310-a photosensitive drum gear;

320-developing shaft coupling;

330-developing roller gear;

340-a powder feeding roller gear;

350-a first gear portion;

360-a second gear portion;

370-third gear portion;

400-force receiver;

410-a force receiving portion;

420-a compression section;

430-a guide slot;

510-a first pusher;

511-a first protrusion;

512-second protrusions;

513-shaft holes;

514-a locking part;

520-moving part;

521-a restricted portion;

610-an elastic member;

620-a second pusher;

621-first section;

622-second section;

623-third section;

624-pushing part;

6241-restriction;

625—a first contact surface;

626-a second contact surface;

627-elastic snap;

710-a connecting rod;

720-a first member;

721-a first coupling;

730-a second member;

731-a second coupling portion;

an 8-tray assembly;

81-ribs;

9-a development separation control unit;

90-a first force applying member;

91-a first force application part;

92-a second force application portion;

95-a second force application member;

96-a third force application part;

97-fourth force application part.

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.

Detailed Description

For a better understanding of the technical solutions of the present application, embodiments of the present application are described in detail below with reference to the accompanying drawings.

It should be understood that the described embodiments are merely some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without making any inventive effort, are intended to be within the scope of the present application.

The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

It should be noted that, the terms "upper", "lower", "left", "right", and the like in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.

The description of the orientation in the following description is specified as:

the directions A1 and A2 are first directions, the direction A1 refers to the positive direction of the first direction, and the direction A2 refers to the negative direction of the first direction;

the directions B1 and B2 are the second direction, the direction B1 is the positive direction of the second direction, and the direction B2 is the negative direction of the second direction;

the directions C1 and C2 are the third directions, the direction C1 is the positive direction of the third direction, and the direction C2 is the negative direction of the third direction.

The first direction, the second direction, and the third direction intersect each other.

As shown in fig. 1 and 2, the present application provides a process cartridge detachably mountable to an electronic image forming apparatus, including a developing unit 100, a drum unit 200, a driving assembly, and a separation unit. The developing unit 100 includes a developing frame 110, a developing roller, a toner feeding roller, a stirring frame, and a toner discharging blade, and the drum unit 200 includes a drum frame 210, an end cover, a photosensitive drum 220, and a charging roller.

The process cartridge is substantially in the shape of a rectangular parallelepiped box having a length in a first direction (A1 and A2 direction), a width in a second direction (B1 and B2 direction), and a height in a third direction (C1 and C2 direction). One end of the processing box in the A1 direction is a driving end, and one end of the processing box in the A2 direction is a conductive end. The developing unit 100 and the drum unit 200 are disposed opposite to each other in the second direction, the direction from the developing unit 100 toward the drum unit 200 is the B1 direction, one end of the process cartridge in the B1 direction is the front end, the direction from the drum unit 200 toward the developing unit 100 is the B2 direction, one end in the B2 direction is the rear end, one end of the process cartridge in the C1 direction is the upper end, and one end in the C2 direction is the lower end.

As shown in fig. 1 and 2, the developing frame 110 encloses a toner hopper that stores toner. The developing frame 110 has a substantially long box shape, the developing frame 110 extends in a first direction (A1 and A2 directions), and the developing frame 110 is provided with a drive side bearing 120 and a conductive side bearing 130 at both ends in the longitudinal direction (A1 and A2 directions), respectively. The agitating frame, the powder feeding roller and the developing roller are rotatably supported on the driving side bearing 120 and the conductive side bearing 130 at both ends of the developing frame 110 in the length direction, and the agitating frame, the powder feeding roller and the developing roller are rotatable by the driving assembly, and the axial directions of the agitating frame, the powder feeding roller and the developing roller are all parallel to the length direction (first direction) of the developing frame 110. The carbon powder in the powder bin is stirred by the stirring frame, so that the carbon powder in the powder bin is prevented from caking, meanwhile, the carbon powder moves towards the powder feeding roller under the stirring of the stirring frame, the powder feeding roller conveys the carbon powder to the developing roller, and then the carbon powder is adsorbed by the charged developing roller.

As shown in fig. 1 and 2, the drum frame 210 also has a longitudinal direction, the longitudinal direction of which coincides with the longitudinal direction of the developing frame 110 (both along the A1 and A2 directions), and both ends of the drum frame 210 in the first direction are provided with end caps, respectively, a driving side end cap 230 fixedly provided at one end of the drum frame 210 in the A1 direction and a conductive side end cap 240 fixedly provided at one end of the drum frame 210 in the A2 direction. The photosensitive drum 220 is rotatably supported on the driving-side end cap 230 and the conductive-side end cap 240.

Specifically, the photosensitive drum 220 is provided on the lower end side (C2 direction side) of the drum frame 210 in the height direction. The toner adsorbed on the developing roller is transferred to the photosensitive drum 220 by a potential difference between the developing roller and the photosensitive drum 220, and the toner on the photosensitive drum 220 is transferred through a transfer belt of an electrophotographic apparatus to form an image on a recording material (e.g., paper). The charging roller is used for uniformly charging the surface of the photosensitive drum 220, so that the photosensitive drum 220 can adsorb carbon powder.

The driving assembly may be provided at one or both ends of the process cartridge in the first direction (length direction). In this application, the driving assembly is provided at the same end of the developing unit 100 in the longitudinal direction, preferably the driving end (one end in the A1 direction).

As shown in fig. 3 and 4, the driving assembly includes a developing coupling 320, a developing roller gear 330, a powder feeding roller gear 340, and a stirring frame gear. The developing coupling 320, the developing roller gear 330, the powder feeding roller gear 340, and the agitator gear are provided outside the driving-side bearing 120.

Specifically, the drive side bearing 120 is provided with a supporting portion for supporting the developing coupling 320, and the developing coupling 320 is for engaging with a developing drive head of an electronic image forming apparatus and receiving a driving force. The developing roller gear 330 is sleeved at one end of the shaft of the developing roller extending out of the driving side bearing 120, the powder feeding roller gear 340 is sleeved at one end of the shaft of the powder feeding roller extending out of the driving side bearing 120, and the stirring frame gear is sleeved at one end of the stirring frame extending out of the driving side bearing 120. The developing roller gear 330, the powder feeding roller gear 340 and the agitating frame gear are directly or indirectly engaged with the developing coupling 320, so that the developing coupling 320 transmits the received driving force, thereby driving the developing roller, the powder feeding roller and the agitating frame to rotate.

In addition, when the developing coupling 320 receives the driving force from the developing driving head, the developing coupling 320 can also realize driving of the photosensitive drum 220, that is, the process cartridge adopts a single driving structure, which can make the structure of both the process cartridge and the electronic image forming apparatus relatively simple, and reduce the cost, compared to a double driving structure.

As shown in fig. 1 and 3, the outer side of the driving side bearing 120 is further provided with a developing protecting cover 140, and the developing protecting cover 140 covers a part of the developing roller gear 330, the powder feeding roller gear 340, the stirring frame gear and the developing coupling 320, so that the function of protecting the driving assembly can be achieved.

Specifically, the developing cover 140 is provided with a cylindrical portion protruding along a side away from the developing frame 110, the cylindrical portion is hollow, an axial direction thereof extends along a longitudinal direction of the developing frame 110, and a portion of the developing coupling 320 extends from the cylindrical portion to the outside of the developing cover 140.

As shown in fig. 1 and 2, the conductive-side cap 240 is provided outside the conductive-side bearing 130, the driving-side cap 230 is provided outside the developing cover 140, and the driving-side cap 230 at least partially overlaps the developing cover 140 as viewed in the longitudinal direction of the process cartridge. The driving-side end cap 230 and the conductive-side end cap 240 each cover at least a portion of the ends of the drum frame 210 and the developing frame 110, respectively. The driving-side end cap 230 is fixedly connected to an end of the drum frame 210.

As shown in fig. 3 and 4, the driving side end cap 230 is provided with a second through hole 232, and a portion of the developing coupling 320 is exposed through the second through hole 232 when the driving side end cap 230 is mounted at the end of the developing frame 110, so that the developing coupling 320 is engaged with the developing driving head to receive the driving force.

The separation unit is configured to receive a force of a developing separation control unit of the electronic imaging device, so as to drive the photosensitive drum 220 to move along the third direction.

Alternatively, the separation unit may be provided at the driving end (one end in the A1 direction) of the process cartridge, at the conductive end (one end in the A2 direction) of the process cartridge, or at both ends of the process cartridge in the first direction (A1 and A2 direction).

Specifically, the process cartridge has a contact state and a release state, and when the process cartridge is in the contact state, the photosensitive drum 220 is in contact with the transfer belt; when the process cartridge is in the detached state, the photosensitive drum 220 is detached from the transfer belt. The separation unit can move the photosensitive drum 220 in the third direction to switch the process cartridge between the contact state and the separation state.

More specifically, when a color image is to be developed, the process cartridges of the four colors are in contact, and the developing drive heads corresponding to the process cartridges of the four colors rotate to drive the developing coupling 320 to rotate, so as to perform a developing operation. When developing a black image alone, only the black process cartridge is in a contact state, the developing drive head corresponding to the black process cartridge rotates the developing coupling 320, the other three color process cartridges are in a disengaged state, and the developing drive heads corresponding to the three color process cartridges also do not rotate.

In this application, when developing black image alone, drive the photoreceptor drum 220 of the color processing box through the separation unit along the third direction motion, can make photoreceptor drum 220 of the color processing box break away from with the transfer belt to prevent to produce great friction between photoreceptor drum 220 of the color processing box and the transfer belt, make the transfer belt rotate smoothly, in order to carry out development work.

Further, in the present application, when the process cartridge is in the contact state and the release state, the developing roller is in contact with the photosensitive drum 220, that is, the drum roller is not separated.

Regarding the specific structure of the separation unit, the present application provides several embodiments in which the other structures of the process cartridge, such as the driving assembly, are slightly different.

Example 1

First, an electronic image forming apparatus adapted to the process cartridge provided in the present embodiment will be described. The electrophotographic apparatus includes a development separation control unit 9, the development separation control unit 9 being provided with a first force application member 90, the first force application member 90 having a first urging portion 91 and a second urging portion 92.

As shown in fig. 3 and 4, in the present embodiment, the driving assembly further includes a photosensitive coupling 300 and a photosensitive drum gear 310. The photosensitive coupling 300 is disposed at one end of the photosensitive drum 220 in the A1 direction, and is in a disconnected state with respect to the drive transmission of the photosensitive drum 220, i.e., the photosensitive coupling 300 does not drive the photosensitive drum 220 to rotate after receiving the driving force of the photosensitive driving head of the electronic imaging device, and is only used for engaging with the photosensitive driving head to eliminate abnormal noise possibly generated by the electronic imaging device when the photosensitive driving head idles.

Specifically, the driving-side end cap 230 is provided with a first through hole 231, and a portion of the photosensitive coupling 300 is exposed through the first through hole 231 when the driving-side end cap 230 is mounted on the end of the drum frame 210, so that the photosensitive coupling 300 is engaged with the photosensitive driving head to receive driving force.

Meanwhile, since the photosensitive drum gear 310 is engaged with the developing roller gear 330, the developing coupling 320 receives the driving force to rotate the developing roller, and also drives the photosensitive drum 220 to rotate together. In the third direction, the developing coupling 320 is located on the upper side (C1 direction side) of the photosensitive coupling 300.

Further, the photosensitive drum 220 is provided so as to be movable in the third direction (C1 and C2 directions) with respect to the end caps, and the upper end (one end in the C1 direction) of the first through hole 231 on the driving-side end cap 230 is extended upward so that the first through hole 231 is substantially elliptical, thereby reserving a space for movement of the photosensitive drum 220 in the third direction.

As shown in fig. 3 to 6, in the present embodiment, the separation unit includes a first separation assembly including a first pushing member 510 and a movable member 520 provided on the drum unit 200. Wherein the first pushers 510 are swingably provided on the driving-side end cap 230 of the drum unit 200, the first pushers 510 rotationally move in a plane where the second direction (B1 and B2 directions) intersects the third direction (C1 and C2 directions).

Specifically, the driving-side cover 230 has a support shaft 233 on an inner side wall (side wall facing the A2 direction), and the first presser 510 has a shaft hole 513 near the left end (one end in the B1 direction), and the first presser 510 is fitted over the support shaft 233 through the shaft hole 513 so that the first presser 510 can rotate around the support shaft 233. The lower end (one end in the C2 direction) of the first urging member 510 protrudes from the lower end of the process cartridge, so that the lower end of the first urging member 510 can reach a position to be engaged with the first force applying member 90 when the process cartridge is mounted to the electronic image forming apparatus.

More specifically, the left lower end (one end in the B1 and C2 directions) of the first pressing member 510 is provided with a first protrusion 511, the right lower end (one end in the B2 and C2 directions) of the first pressing member 510 is provided with a second protrusion 512, and the first protrusion 511 and the second protrusion 512 are for receiving the forces of the first urging portion 91 and the second urging portion 92, respectively. The first pushing member 510 is further provided with a locking portion 514, where the locking portion 514 is locked on the driving side end cover 230, for fixing the first pushing member 510, and has a first position and a second position.

The movable member 520 is disposed on the driving side end cover 230, the moving direction thereof is to move up and down along the third direction (the directions of C1 and C2), and the movable member 520 and the first pushing member 510 are disposed opposite to each other in the third direction, i.e. the projections of the movable member 520 and the first pushing member 510 in the third direction are at least partially overlapped, and the movable member 520 is located on the upper side (the side of the direction of C1) of the first pushing member 510.

Specifically, the inner side wall (side wall facing the A2 direction) of the driving side end cover 230 is provided with a first limiting portion 234, the movable member 520 is provided with a limited portion 521 near the upper end (one end in the C1 direction), and the limited portion 521 is sleeved on the first limiting portion 234 to limit the movement of the movable member 520 in the third direction within a reasonable range.

As shown in fig. 4 to 6, when the first protrusion 511 receives the force of the first force application portion 91, the first pushing member 510 rotates counterclockwise (in the direction shown in fig. 6), and after the first pushing member 510 is out of contact with the movable member 520, the movable member 520 moves downward in the third direction due to its own weight and the weight of the photosensitive drum 220. Meanwhile, the photosensitive drum 220 moves downward in the third direction along with the movable member 520, contacting the transfer belt. In this process, the locking portion 514 moves from the first position to the second position, and fixes the first pushing member 510 at the second position.

When the second protrusion 512 receives the force of the second force application portion 92, the first pushing member 510 rotates clockwise (in the direction shown in fig. 6), and after the first pushing member 510 abuts against the movable member 520, the movable member 520 moves in the third direction under the pushing force of the first pushing member 510. At the same time, the photosensitive drum 220 is driven to move in the third direction, out of contact with the transfer belt. In this process, the locking portion 514 moves from the second position to the first position, and fixes the first pushing member 510 at the first position, that is, fixes the photosensitive drum 220 at a position out of contact with the transfer belt.

As shown in fig. 1 to 6, when the process cartridge is mounted in the electronic image forming apparatus, the electronic image forming apparatus gives an instruction when the electronic image forming apparatus performs a preparatory operation, the photosensitive drive head and the development drive head of the electronic image forming apparatus output driving forces (the photosensitive drum 220 does not receive the driving force of the photosensitive drive head in this embodiment), and the development separation control unit 9 is controlled to move in the B2 direction so that the second projection 512 abuts against the first force application member 90 and receives a force from the second force application portion 92. The first pushing member 510 rotates clockwise (in the direction shown in fig. 6) under the action of the second force application portion 92 until, after the first pushing member 510 abuts against the movable member 520, the movable member 520 moves in the third direction under the pushing force of the first pushing member 510, and drives the photosensitive drum 220 to move in the third direction (in the direction C1) so as to be out of contact with the transfer belt. In this process, the locking portion 514 of the first pressing member 510 is moved from the second position to the first position, and the first pressing member 510 is fixed in the first position, that is, the photosensitive drum 220 is fixed in a position out of contact with the transfer belt. At this time, the state of the process cartridge is the disengaged state, and then the rotation of the developing drive head is stopped until the preparation operation is completed, and the rotation of the photosensitive drive head is also stopped.

Although the photosensitive drum 220 moves upward, the distance of upward movement is not large (the distance of upward movement only needs to ensure that the photosensitive drum 220 is separated from the transfer belt), so the photosensitive drum 220 is still in contact with the developing roller in the separated state, i.e., the drum roller is not separated. When the electronic image forming apparatus does not need to perform the developing operation, it maintains a state after the preparation operation is completed.

When the electronic image forming apparatus needs to perform a developing operation, the electronic image forming apparatus issues an instruction to control the developing separation control unit 9 to move in the B1 direction so that the first protrusion 511 receives the force of the first force application portion 91. The first pushing member 510 rotates counterclockwise (in the direction shown in fig. 6) under the action of the first force application portion 91, so that the first pushing member 510 is out of contact with the movable member 520, and the movable member 520 moves downward (in the direction of C2) in the third direction under the action of the self-weight and the weight of the photosensitive drum 220. Meanwhile, the photosensitive drum 220 moves downward in the third direction along with the movable member 520, contacting the transfer belt. In this process, the latching portion 514 of the first pressing member 510 is moved from the first position to the second position, and the first pressing member 510 is fixed at the second position, that is, the photosensitive drum 220 is held at a position in contact with the transfer belt, at which time the state of the process cartridge is in a contact state (developable state). Meanwhile, the developing drive head of the electronic imaging device rotates to drive the developing coupling 320 to rotate, and then drive the developing roller and the photosensitive drum 220 to rotate, so as to perform developing work.

Example two

First, an electronic image forming apparatus adapted to the process cartridge provided in the present embodiment will be described. The electronic image forming apparatus includes a first pressing mechanism and a development separation control unit 9, the development separation control unit 9 being further provided with a second force application member 95, the second force application member 95 having a third force application portion 96 and a fourth force application portion 97.

In the present embodiment, the developing unit 100 is rotatable with respect to the drum unit 200, the rotation axis of the developing unit 100 is the axis of the developing coupling 320, and the developing unit 100 is rotatable about the rotation axis after the force receiving member 400 receives the force of the second force applying member 95 of the electrophotographic image forming apparatus.

As shown in fig. 7 to 9, the separation unit includes a force receiving member 400 and a second separation assembly, and the driving assembly further includes a first gear portion 350 excluding the photosensitive coupling 300.

As shown in fig. 8 and 9, a first gear portion 350 is provided at one end of the photosensitive drum 220 in the A1 direction, and the first gear portion 350 is engaged with the developing roller gear 330 to indirectly receive the driving force rotation of the electrophotographic image forming apparatus, thereby driving the photosensitive drum 220 to rotate.

The photosensitive drum 220 is provided with a groove portion 221, a circular truncated cone portion 222, and a first connection portion 223, and the groove portion 221, the circular truncated cone portion 222, and the first connection portion 223 are sequentially disposed outside the first gear portion 350 (on one side in the A1 direction) in the A1 direction, that is, the groove portion 221 is closest to the first gear portion 350, and the first connection portion 223 is farthest from the first gear portion 350. The first gear portion 350, the groove portion 221, the truncated cone portion 222, and the first connecting portion 223 are all coaxially disposed with the photosensitive drum 220. The diameter of the groove part 221 is smaller than that of the round platform part 222, a guide surface 224 is arranged at the joint of the groove part 221 and the round platform part 222, the guide surface 224 is an arc surface or an inclined surface, the first connecting part 223 is arranged at the center of the end surface of the round platform part 222, the first connecting part 223 is a columnar protrusion, and a groove is arranged on the circumferential surface of the first connecting part 223.

As shown in fig. 8, a force receiving member 400 is provided at the driving end of the process cartridge, the force receiving member 400 being movable relative to the developing unit 100. The force receiving member 400 is movably disposed between the drive-side bearing 120 and the developing cover 140.

Specifically, the force receiving member 400 has a pressure receiving portion 420 at an upper portion thereof and a force receiving portion 410 at a lower portion thereof. At least a portion of the pressure receiving portion 420 protrudes from the upper portions of the drive side bearing 120 and the developing cover 140 so that when the process cartridge is mounted to the electronic image forming apparatus, the pressure receiving portion 420 can be pressed by a first pressing mechanism within the electronic image forming apparatus so that the entire force receiving member 400 moves downward with respect to the developing unit 100, thereby moving the force receiving portion 410 at the lower end of the force receiving member 400 to a position to cooperate with the developing separation control unit 9 of the electronic image forming apparatus.

The force receiving portion 410 is provided on the force receiving member 400, and before the force of the first pressing mechanism is not received, the force receiving portion 410 is positioned at a position where it cannot be engaged with the developing separation control unit 9, so that damage caused by interference and collision between the force receiving portion 410 and the developing separation control unit 9 during the process of mounting the process cartridge can be avoided.

Preferably, the force receiving member 400 may be provided with a guide groove 430 extending in the third direction, and the developing cover 140 may be provided with a guide post cooperating with the guide groove 430. When installed, the guide posts are inserted into the guide slots 430, which can guide and limit the movement of the force receiver 400.

Alternatively, guide posts may be provided on the force receiving member 400, and guide grooves may be provided on the developing cover 140 or the driving side bearing 120 to achieve the same effect.

Alternatively, the force receiving member 400 may be provided at the conductive end of the process cartridge, i.e., between the conductive side bearing 130 and the conductive side cap 240. The force receiving members 400 may be provided at both ends in the longitudinal direction of the process cartridge.

As shown in fig. 8, the second separation assembly is provided to the drum unit 200, and includes an elastic member 610 and a second pushing member 620, the elastic member 610 being capable of providing a force to move the photosensitive drum 220 upward (in the C1 direction), the second pushing member 620 being capable of being driven by the developing unit 100 and pushing the photosensitive drum 220 downward (in the C2 direction).

As shown in fig. 7 and 8, a second pushing member 620 is movably provided between the driving-side end cap 230 and the end of the drum frame 210, and the moving direction of the second pushing member 620 is along the first direction (A1 and A2 directions). The second presser 620 is a substantially rod-shaped member extending from the upper end of the driving-side end cap 230 to the position of the photosensitive drum 220.

As shown in fig. 10, the second pushing member 620 includes a first segment 621, a second segment 622, a third segment 623, and a pushing portion 624 connected in sequence, the first segment 621 extending in a first direction, the second segment 622 extending in a second direction, and the third segment 623 extending in a third direction. It will be appreciated that the configuration of the second pressing member 620 in the multi-stage bent shape is for matching or avoiding the structures on the driving side end cap 230, the drum frame 210, and the developing unit 100, and is not the only form of the shape of the second pressing member 620, and the specific shape of the second pressing member 620 is not limited in this embodiment.

Alternatively, the second pushing member 620 may be movably provided at the conductive end of the process cartridge, i.e., between the conductive-side end cap 240 and the end of the drum frame 210. The second pushing members 620 may be provided at both ends in the longitudinal direction of the process cartridge.

As shown in fig. 10, the end of the first segment 621 of the second biasing member 620 is provided with a first protrusion having a first contact surface 625, and the first contact surface 625 is beveled. A second protrusion is provided on the third section 623 of the second pushing member 620 near the pushing portion 624, and a second contact surface 626 is provided on the second protrusion, where the second contact surface 626 is a shaped inclined surface inclined with respect to the first direction, the second direction and the third direction.

As shown in fig. 11, the developing cover 140 is provided with a third contact surface 141 and a fourth contact surface 142 that are respectively engaged with the first contact surface 625 and the second contact surface 626.

Specifically, a third protrusion is provided on the upper end of the developing cover 140 near one side of the drum unit 200, and a third contact surface 141 for matching with the first contact surface 625 is provided on the third protrusion, and the third contact surface 141 is an inclined surface; the developing protecting cover 140 is further provided with a fourth protrusion, the fourth protrusion is provided with a fourth contact surface 142, the fourth contact surface 142 is a special-shaped inclined surface inclined relative to the first direction, the second direction and the third direction, and the special-shaped inclined surface can be formed by combining a plurality of inclined surfaces with different slopes. In the third direction, the third contact surface 141 and the fourth contact surface 142 are located on both sides of the developing coupling 320, i.e., on both sides of the rotation axis of the developing unit 100, respectively, and thus, the third contact surface 141 and the fourth contact surface 142 have opposite movement tracks when the developing unit 100 rotates relative to the drum unit 200.

As shown in fig. 10 and 12, the pushing portion 624 of the second pushing member 620 is substantially arc-shaped, having the same curvature as the groove portion 221 and the truncated cone portion 222 on the photosensitive drum 220. The edge of the lower end (one end in the C2 direction) of the pushing portion 624 toward the A1 direction is provided as an arc surface or an inclined surface for cooperation with the guide surface 224 between the groove portion 221 and the circular truncated cone portion 222, so that the pushing portion 624 and the photosensitive drum 220 can relatively move along the guide surface 224. In the contact state, the pushing portion 624 abuts on the truncated cone portion 222 of the photosensitive drum 220, and the photosensitive drum 220 contacts the transfer belt.

As shown in fig. 8 and 10, the pushing portion 624 is provided with a restricting portion 6241 at both ends in the second direction, the driving-side end cap 230 is provided with a second restricting portion 235, the restricting portion 6241 is a protrusion, and the second restricting portion 235 is a groove extending in the first direction. In assembly, the restricting portion 6241 is fitted into the second restricting portion 235, and the restricting portion 6241 is restricted by the second restricting portion 235 so as not to be movable in the second direction or the third direction, but to be movable only in the first direction along the second restricting portion 235.

As shown in fig. 7, the elastic member 610 is preferably a tension spring, one end of which is connected to the driving-side end cap 230, and the other end of which is connected to the first connection portion 223 on the photosensitive drum 220. Specifically, the hook portion, which may be a tension spring, is hooked in the groove of the first connection portion 223. The driving side end cap 230 may be provided with a second connection part 236 having the same structure as the first connection part 223, and one end of the tension spring is connected to the second connection part 236.

In the contact state, the tension spring is configured to be in a stretched state, generating an upward moving force on the photosensitive drum 220, but the tension spring cannot pull the photosensitive drum 220 to move upward due to the pressing force of the second pressing member 620 on the photosensitive drum 220.

As shown in fig. 7, 12 and 13, when the process cartridge is mounted in the electronic image forming apparatus, the electronic image forming apparatus gives an instruction when the electronic image forming apparatus performs a preparatory operation, the photosensitive drive head and the developing drive head of the electronic image forming apparatus output driving forces (the present embodiment does not receive the driving force of the photosensitive drive head), and the developing separation control unit 9 is controlled to move in the B2 direction, and the fourth urging portion 97 of the second urging member 95 abuts against the force receiving portion 410 and then drives the entire developing unit 100 to rotate (for example, counterclockwise) with the axis of the developing coupling 320 as the rotation center through the force receiving member 400. At this time, the developing roller and the photosensitive drum 220 are briefly separated, and the third contact surface 141 of the developing cover 140 contacts the first contact surface 625 of the second pressing member 620, and applies a force to the first contact surface 625 during rotation to move the second pressing member 620. Since the movement of the second pushing member 620 in the second direction or the third direction is restricted by the second restricting portion 235, the second pushing member 620 moves only in the first direction along the A2 direction, the pushing portion 624 moves along the guide surface 224 from the position abutting against the circular truncated cone portion 222 to the position where the groove portion 221 is located, and since the diameter of the groove portion 221 is smaller than that of the circular truncated cone portion 222, the pushing portion 624 no longer abuts against the photosensitive drum 220, and the photosensitive drum 220 moves upward (moves in the C1 direction) under the tensile force of the elastic member 610 until the groove portion 221 abuts against the pushing portion 624. At this time, the photosensitive drum 220 is separated from the transfer belt in the third direction, and the state of the process cartridge is the separated state. At the same time, the developing drive head stops rotating. After the preparation operation is completed, the photosensitive drive head also stops rotating. Since the photosensitive drum 220 moves upward, the photosensitive drum 220 is still in contact with the developing roller in the disengaged state, i.e., the drum roller is not separated. When the electronic image forming apparatus does not need to perform the developing operation, it maintains a state after the preparation operation is completed.

As shown in fig. 7, 12 and 13, when the electronic image forming apparatus needs to perform a developing operation, the electronic image forming apparatus issues an instruction to control the developing separation control unit to move in the direction B1, after the third urging portion 96 of the second urging member 95 abuts against the force receiving portion 410, the whole developing unit 100 is driven to rotate (e.g., clockwise) with the axis of the developing coupling 320 as the rotation center by the force receiving member 400, the fourth contact surface 142 on the developing cover 140 contacts and interacts with the second contact surface 626 on the second urging member 620, so that the second urging member 620 moves in the direction A1, the urging portion 624 moves along the guide surface 224 between the groove portion 221 and the round table portion 222, the photosensitive drum 220 is urged to move downward (move in the direction C2), the elastic member 610 is again stretched until the urging portion 624 moves to a position abutting against the round table portion 222, and the photosensitive drum 220 moves downward to contact with the transfer belt, and at this time the state of the process cartridge is in the contact state (developable state). Meanwhile, the developing drive head of the electronic imaging device rotates to drive the developing coupling 320 to rotate, and then drive the developing roller and the photosensitive drum 220 to rotate, so as to perform developing work.

Example III

The third embodiment differs from the second embodiment in that the photosensitive drum 220 and the second pushing member 620 are different in structure.

As shown in fig. 14 to 16, a second pushing member 620 is movably provided between the driving-side end cap 230 and the end of the drum frame 210, and the moving direction of the second pushing member 620 is in the third direction (C1 and C2 directions). The upper end (one end along the C1 direction) of the second pushing member 620 is further provided with an elastic buckle 627, and the elastic buckle 627 is engaged on the driving side end cover 230, so as to prevent the second pushing member 620 from being separated from the driving side end cover 230 when moving.

As shown in fig. 16, the photosensitive drum 220 is provided with the groove portion 221 eliminated, and the circular truncated cone portion 222 and the first connecting portion 223 are provided in this order outside the first gear portion 350.

As shown in fig. 14 to 16, when the process cartridge is mounted in the electronic image forming apparatus, the electronic image forming apparatus gives an instruction when the electronic image forming apparatus performs a preparatory operation, the photosensitive drive head and the development drive head of the electronic image forming apparatus output driving forces (the present embodiment does not receive the driving force of the photosensitive drive head), and the development separation control unit 9 is controlled to move in the B2 direction, and the fourth force application portion 97 of the second force application member 95 abuts against the force receiving portion 410 and then drives the entire development unit 100 to rotate (e.g., counterclockwise) with the axis of the development coupling 320 as the rotation center through the force receiving member 400. At this time, the developing roller and the photosensitive drum 220 are separated briefly, the third contact surface 141 on the developing cover 140 is in contact with the first contact surface 625 of the second pressing member 620 and applies a force to the first contact surface 625 during rotation to move the second pressing member 620, and since the movement of the second pressing member 620 in the first direction or the second direction is restricted by the second restricting portion 235, the second pressing member 620 moves only in the third direction along the C1 direction, the pushing portion 624 no longer presses the photosensitive drum 220, the photosensitive drum 220 moves upward (moves in the C1 direction) in synchronization with the second pressing member 620 under the tensile force of the elastic member 610, and the photosensitive drum 220 is separated from the transfer belt in the third direction. At the same time, the developing drive head stops rotating. After the preparation operation is completed, the photosensitive drive head also stops rotating. Since the photosensitive drum 220 moves upward, the photosensitive drum 220 is still in contact with the developing roller at this time, i.e., the drum roller is not separated. When the electronic image forming apparatus does not need to perform the developing operation, it maintains a state after the preparation operation is completed.

When the electronic imaging device needs to perform development work, the electronic imaging device sends out an instruction to control the development separation control unit to move towards the direction B1, after the third force application part 96 of the second force application member 95 is abutted against the force receiving part 410, the force receiving member 400 drives the whole developing unit 100 to rotate (for example, clockwise) by taking the axis of the developing coupling 320 as the rotation center, the fourth contact surface 142 on the developing protecting cover 140 contacts and interacts with the second contact surface 626 on the second pushing member 620, so that the second pushing member 620 moves downwards along the direction C2, the photosensitive drum 220 is pushed to synchronously move downwards (move along the direction C2), the elastic member 610 is stretched again, and the photosensitive drum 220 moves downwards to contact with the transfer belt. Meanwhile, the developing drive head of the electronic imaging device rotates to drive the developing coupling 320 to rotate, and then drive the developing roller and the photosensitive drum 220 to rotate, so as to perform developing work.

Other structures of the process cartridge of this embodiment are the same as those of the embodiment, and will not be described here again.

Example IV

First, an electronic image forming apparatus adapted to the process cartridge provided in the present embodiment will be described. As shown in fig. 17 and 18, the electronic image forming apparatus includes a development separation control unit 9 and a tray assembly 8, the tray assembly 8 being for detachably mounting four color process cartridges. Further, the tray assembly 8 can be pulled out from the electronic image forming apparatus to facilitate mounting of the process cartridge.

In the present embodiment, the developing coupling 320 passes through the developing cover 140 and is capable of an axial telescopic motion in the driving side end cap 230 to be coupled to or decoupled from the developing driving head to receive or not receive the driving force.

As shown in fig. 19, the driving assembly further includes a photosensitive drum gear 310 fixedly sleeved at the driving end of the photosensitive drum 220, and a second gear portion 360 rotatably coupled to the developing coupling 320 in a relatively axially sliding manner so as to be rotatable by the developing coupling 320 without interfering with the axial movement of the developing coupling 320, and the second gear portion 360 is capable of maintaining its axial position so as to be capable of maintaining engagement with the developing roller gear 330.

In addition, the driving assembly may further provide a third gear portion 370 between the second gear portion 360 and the photosensitive drum gear 310 to achieve transmission.

In this embodiment, the separation unit includes a force receiving member 400, a retraction assembly, and a reset member.

As shown in fig. 19 and 20, the force receiving member 400 is constructed close to that in the second embodiment. The force receiving member 400 is hinged to the drive side bearing 120 or abuts the developing cover 140.

The force receiving member 400 may rotate the developing unit 100 upon receiving the force of the second force applying member 95 of the developing separation control unit 9. The developing unit 100 may rotate the drum unit 200 relative to the tray assembly 8 with the rotation shaft of the developing coupling 320 as an axis, so as to move the drum unit 200 along a third direction, and further contact or separate the photosensitive drum 220 with or from the transfer belt below. Since the drum frame 210 is fixed with the driving side end cap 230 and the conductive side end cap 240, respectively, that is, the entire process cartridge can be rotated relative to the tray assembly 8 by the developing unit 100.

Specifically, when the process cartridge is in the detached state, the photosensitive drum 220 is detached from the transfer belt, and the developing unit 100 and the drum unit 200 are in the raised positions; when the process cartridge is in the contact state, the photosensitive drum 220 is in contact with the transfer belt, and the developing unit 100 and the drum unit 200 are in the operating position.

Further, the tray assembly 8 is configured to allow the process cartridge to rotate within a certain range, and in particular, to allow the drive side end cap 230 and the conductive side end cap 240 to rotate within a certain range relative to the tray assembly 8.

Further, as shown in fig. 18, the developing unit 100 is provided with a lock portion 150, and the lock portion 150 can hold the process cartridge in the disengaged state (i.e., the raised position) until the force receiving member 400 receives the force of the third force applying portion 96 of the developing separation control unit 9, and the lock portion 150 fails, and the developing unit 100 returns from the disengaged state to the contact state (i.e., the operating position).

Specifically, as shown in fig. 18, the locking portion 150 is a protruding portion formed on the outside of the drive-side bearing 120. It is understood that the locking portion 150 may be provided at other positions of the developing unit 100 or the drum unit 200 as long as it can be engaged with the tray assembly 8 and form a lock.

As shown in fig. 19 and 20, the retraction assembly is disposed between the force receiving member 400 and the developing coupling 320. The retraction assembly includes a linkage 710, a first member 720 and a second member 730. Both ends of the link 710 are hinged with the first member 720 and the force receiving member 400, respectively. The first member 720 is rotatably sleeved on the developing coupling 320, and the first member 720 is restrained between the second member 730 and the inner wall of the developing cover 140 in the axial direction. The first member 720 can be rotated by the link 710. When the first member 720 rotates, the first member 720 can push the second member 730 to move along the axial direction towards the direction close to the developing frame 110, and the second member 730 moves to drive the developing coupling 320 to move towards the direction close to the developing frame 110, i.e. the developing coupling 320 contracts.

Specifically, as shown in fig. 20, the first member 720 has a first coupling portion 721, the first coupling portion 721 extending in the axial direction toward the developing frame 110, and having a first inclined surface and a flat surface adjacent to the first inclined surface. The second member 730 has a second coupling portion 731, and the second coupling portion 731 protrudes in a direction away from the developing frame 110 in the axial direction and has a second inclined surface and a flat surface adjacent to the second inclined surface.

The first slope of the first coupling part 721 can contact with the second slope of the second coupling part 731 and apply a force until the plane of the first coupling part 721 abuts against the plane of the second coupling part 731. In this process, the first member 720 pushes the second member 730 to move in the axial direction toward the developing frame 110, so that the second member 730 drives the developing coupling 320 to shrink.

The reset member is used to reset the extension of the developing coupling 320. Alternatively, the restoring member is a spring or other elastic member provided in the cylindrical portion of the developing coupling 320, one end of which is fixed to the developing coupling 320 and the other end of which is fixed to the developing frame 110.

When the process cartridge is mounted in the electronic image forming apparatus, the electronic image forming apparatus performs a preparation action and does not require a developing operation after the preparation is completed, the left side of the lower end portion of the force receiving member 400 receives the force of the fourth force applying portion 97 of the developing separation control unit 9 as seen from the direction of the driving side of the process cartridge, the force receiving member 400 rotates counterclockwise, driving the link 710 to move such that the first member 720 rotates counterclockwise, the first coupling portion 721 on the first member 720 pushes the second coupling portion 731 of the second member 730 such that the second member 730 moves in the axial direction, thereby driving the developing coupling 320 to shrink in the axial direction to be separated from the developing driving head of the electronic image forming apparatus.

The force receiving member 400 continues to rotate and then abuts against the driving side bearing 120 or the developing cover 140 to bring the developing unit 100 to rotate counterclockwise, and since the drum unit 200 is connected to the developing unit 100, the drum unit 200 is simultaneously brought to rotate counterclockwise together with the developing unit 100, the developing unit 100 and the drum unit 200 are rotated from the operating position to the raised position, so that the photosensitive drum 220 is separated from the transfer belt, the locking portion 150 moves with the developing unit 100 and passes over the rib 81 of the tray assembly 8, abuts against the rib 81, and holds the developing unit 100 and the drum unit 200 in the raised position. When the force of the fourth urging portion 97 of the development separation control unit 9 is withdrawn, the development unit 100 and the drum unit 200 are not affected, and the photosensitive drum 220 remains separated from the transfer belt.

When the electronic image forming apparatus needs to perform a developing operation, the right side of the lower end portion of the force receiving member 400 receives the force of the third force applying portion 96 of the developing separation control unit 9, the force receiving member 400 rotates clockwise, the developing unit 100 is driven to rotate clockwise, the locking portion 150 moves with the developing unit 100, and is disengaged from the tray assembly 8, the developing unit 100 and the drum unit 200 return to the working positions from the raised positions, so that the photosensitive drum 220 is in contact with the transfer belt; meanwhile, the force receiving member 400 drives the connecting rod 710 to move, so that the first member 720 rotates clockwise, the first member 720 is reset, the second member 730 loses the pushing force exerted by the first member 720, and under the action of the resetting member, the developing coupling 320 extends axially and drives the second member 730 to reset together. Meanwhile, the developing coupling 320 is engaged with a developing drive head of the electronic imaging device, and the developing drive head rotates to drive the developing coupling 320 to rotate, thereby driving the developing roller and the photosensitive drum 220 to rotate for developing.

When a color image is required to be developed, the developing units 100 and 200 of the four color process cartridges are in the working positions, the photosensitive drums 220 are in contact with the transfer belt, and the photosensitive drums 220 and the developing rollers are driven to rotate by the developing couplings 320 to perform the developing operation. When developing a black image alone, only the developing unit 100 and the drum unit 200 of the process cartridge of black are in the operating position, the developing units 100 and the drum units 200 of the process cartridges of the other three colors are in the raised position, and the photosensitive drums 220 thereof are separated from the transfer belt, so that the movement of the transfer belt is not affected, while the developing drive heads corresponding to the process cartridges of the other three colors stop rotating, and the photosensitive drums 220 and the developing rollers 22 do not receive the driving force and remain stationary. Since the developing unit 100 and the drum unit 200 may rotate the developing coupling 320 to a certain extent, the developing coupling 320 is axially retracted in this example and is further separated from the developing driving head (in a stationary state), so that the developing unit 100 and the drum unit 200 can smoothly rotate, and are not limited and affected by the developing driving head, and the developing driving head is prevented from being damaged.

The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

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

a developing unit (100), the developing unit (100) being provided with a developing frame (110) and a rotatable developing roller;

a drum unit (200), the drum unit (200) being provided with a drum frame (210) and a rotatable photosensitive drum (220), the photosensitive drum (220) being movable in a third direction with respect to the electronic image forming apparatus to be in contact with or separated from a transfer belt of the electronic image forming apparatus;

a separation unit for receiving a force of a developing separation control unit of the electronic image forming apparatus to drive the photosensitive drum (220) to move in a third direction;

wherein the process cartridge has a contact state and a release state, the photosensitive drum (220) is in contact with the transfer belt when the process cartridge is in the contact state, and the photosensitive drum (220) is released from the transfer belt when the process cartridge is in the release state.

2. A process cartridge according to claim 1, wherein an end of said drum frame (210) is provided with a drive side end cap (230);

the separation unit comprises a first separation assembly movably disposed in the drive side end cap (230), the first separation assembly comprising:

A first pushing member (510), the first pushing member (510) being configured to rotate relative to the driving-side end cap (230) upon receiving a force of the developing separation control unit (9);

the movable piece (520), movable piece (520) cover is located the tip of sensitization drum (220), movable piece (520) with first biasing member (510) butt, first biasing member (510) rotation can drive movable piece (520) with sensitization drum (220) are along the third direction motion.

3. A process cartridge according to claim 2, wherein said first urging member (510) is provided with a first protrusion (511) and a second protrusion (512) protruding from said driving-side end cap (230), said first protrusion (511) for receiving a force of a first force application portion (91) of said development separation control unit (9), said second protrusion (512) for receiving a force of a second force application portion (92) of said development separation control unit (9);

the first projection (511) receives the urging force of the first urging portion (91) and the second projection (512) receives the urging force of the second urging portion (92), and the first urging member (510) rotates in opposite directions.

4. A process cartridge according to claim 2, wherein said first pressing member (510) is further provided with a locking portion (514), said locking portion (514) being locked with said driving-side end cap (230) for fixing said first pressing member (510) when said process cartridge is in the contact state or the release state.

5. A process cartridge according to claim 2, wherein said driving-side end cap (230) is provided with a fulcrum (233), said first urging member (510) is provided with a shaft hole (513), and said fulcrum (233) is rotatably connected to said shaft hole (513).

6. A process cartridge according to claim 2, wherein said driving-side end cap (230) is provided with an elliptical first through hole (231), and at least a portion of said movable member (520) is accommodated in said first through hole (231) to restrict movement of said movable member (520) in the first direction and/or the second direction;

the driving side end cover (230) is further provided with a first limiting part (234), the movable piece (520) is provided with a limited part (521), and the first limiting part (234) is matched with the limited part (521) so as to limit the movement of the movable piece (520) along a third direction.

7. A process cartridge according to claim 1, wherein said separation unit comprises:

a force receiving member (400), wherein the force receiving member (400) is arranged on the developing unit (100) and is used for receiving the acting force of the developing separation control unit (9) so as to drive the developing unit (100) to rotate;

and the second separation assembly is arranged on the drum unit (200), and the second separation assembly can be driven to move by the rotation of the developing unit (100) so as to drive the photosensitive drum (220) to move along a third direction.

8. A process cartridge according to claim 7, wherein an end of said drum frame (210) is provided with a drive side end cap (230);

the second separation assembly includes:

an elastic member (610), wherein one end of the elastic member (610) is connected with the photosensitive drum (220), and the other end of the elastic member is connected with the driving side end cover (230), and the elastic member (610) can drive the photosensitive drum (220) to be far away from the transfer belt along a third direction;

and a pushing part (624) is arranged at one end of the second pushing part (620), the pushing part (624) is abutted to the photosensitive drum (220), and the developing unit (100) can rotate to drive the second pushing part (620) to move along the first direction or the third direction so as to push or avoid the photosensitive drum (220) to move along the third direction.

9. The process cartridge according to claim 8, wherein the second pushing member (620) is provided with a first protrusion provided with a first contact surface (625) and a second protrusion provided with a second contact surface (626);

a developing protecting cover (140) is arranged at the end part of the developing frame (110), and a third contact surface (141) capable of being in contact with the first contact surface (625) and a fourth contact surface (142) capable of being in contact with the second contact surface (626) are arranged on the developing protecting cover (140);

The developing unit (100) can rotate to enable the third contact surface (141) to apply a force to the first contact surface (625) or the fourth contact surface (142) to apply a force to the second contact surface (626), and the second pushing member (620) rotates in the opposite direction when the third contact surface (141) applies a force to the first contact surface (625) and the fourth contact surface (142) applies a force to the second contact surface (626).

10. The process cartridge according to claim 9, wherein the first contact surface (625), the second contact surface (626), the third contact surface (141) and the fourth contact surface (142) are inclined surfaces inclined with respect to the first direction and/or the second direction and/or the third direction.

11. A process cartridge according to claim 8, wherein an end of said second pushing member (620) away from said pushing portion (624) is further provided with an elastic catch (627), said elastic catch (627) being engaged with said driving side end cap (230).

12. A process cartridge according to claim 8, wherein an end of said photosensitive drum (220) is provided with: a groove part (221), a round table part (222) and a guide surface (224), wherein the diameter of the groove part (221) is smaller than that of the round table part (222), and the guide surface (224) is connected with the groove part (221) and the round table part (222);

When the processing box is in a contact state, the pushing part (624) is in contact with the round platform part (222), when the processing box is in a separation state, the pushing part (624) is in contact with the groove part (221), and when the processing box is switched between the contact state and the separation state, the pushing part (624) is in contact with the guide surface (224).

13. A process cartridge according to claim 8, wherein an end of said photosensitive drum (220) is provided with: and a circular truncated cone portion (222), wherein the pushing portion (624) is abutted against the circular truncated cone portion (222).

14. A process cartridge according to claim 8, wherein said driving-side end cap (230) is provided with a second restriction portion (235), said pushing portion (624) is provided with a restriction portion (6241), and said second restriction portion (235) cooperates with said restriction portion (6241) to restrict movement of said second pushing member (620) to move said second pushing member (620) in the first direction or the third direction.

15. A process cartridge according to claim 8, wherein an end of said photosensitive drum (220) is provided with: the rotary table part (222), be provided with first connecting portion (223) on the terminal surface that rotary table part (222) were kept away from sensitization drum (220), be provided with second connecting portion (236) on the drive side end cover (230), elastic component (610) one end with first connecting portion (223) are connected, the other end with second connecting portion (236) are connected.

16. A process cartridge according to claim 8, wherein said second urging member (620) is provided with a first section (621), a second section (622), and a third section (623) extending in different directions to avoid said drum unit (200) and said developing unit (200).

17. A process cartridge according to claim 1, wherein said separation unit comprises:

the force receiving piece (400) is arranged on the developing unit (100) and is used for receiving the acting force of the developing separation control unit (9) so as to drive the developing unit (100) to rotate, and the developing unit (100) drives the drum unit (200) to move along a third direction so as to enable the drum unit (200) to be switched between a separation state and a contact state.

18. A process cartridge according to claim 17, wherein an end of said developing unit (100) is provided with a developing coupling (320);

the separation unit further includes: a contraction assembly capable of driving the developing coupling (320) to contract in the axial direction, and a reset member capable of driving the developing coupling (320) to extend in the axial direction;

wherein the retraction assembly is connected with the force receiving element (400), and the force receiving element (400) can drive the retraction assembly to move.

19. The process cartridge of claim 18, wherein said retraction assembly comprises:

-a link (710), the link (710) being hinged with the force receiver (400);

a first member (720), wherein the first member (720) is sleeved outside the developing coupling (320) and is rotationally connected with the connecting rod (710), and the first member (720) is provided with a first coupling part (721);

a second member (730), wherein the second member (730) is sleeved outside the developing coupling (320) and is arranged at one side of the first member (720) away from the connecting rod (710), and the second member (730) is provided with a second coupling part (731) which can be abutted with the first coupling part (721);

when the first member (720) rotates relative to the second member (730), the first coupling part (721) pushes the second coupling part (731) so that the second member (730) is far away from the first member (720) along the axial direction, and the developing coupling (320) is driven to shrink.

20. A process cartridge according to claim 19, wherein said first coupling portion (721) has a first inclined surface, and said second coupling portion (731) has a second inclined surface, and said first inclined surface abuts against said second inclined surface.

21. A process cartridge according to claim 18, wherein said reset member is provided between said developing coupling (320) and said developing frame (110).

22. A process cartridge according to any one of claims 17, wherein said developing unit (100) is provided with a locking portion (150), said locking portion (150) being for engaging with a tray assembly (8) of said electronic image forming apparatus to hold said process cartridge in a disengaged state.

23. A process cartridge according to any one of claims 1-22, wherein said developing roller is in contact with said photosensitive drum (220) when said process cartridge is in both of a contact state and a release state.