CN220323726U

CN220323726U - Drum unit and processing box

Info

Publication number: CN220323726U
Application number: CN202322019960.XU
Authority: CN
Inventors: 陈宇; 梁晓明; 罗琴; 朱一静; 虞文俊; 靳杨; 陈柔娟; 张为志
Original assignee: Zhuhai Nastar Information Technology Co ltd
Current assignee: Zhuhai Nastar Information Technology Co ltd
Priority date: 2022-07-28
Filing date: 2023-07-28
Publication date: 2024-01-09
Anticipated expiration: 2033-07-28
Also published as: CN117471872A

Abstract

The present application relates to a drum unit including a photosensitive drum and a coupling provided at an end of the photosensitive drum for engagement with a driving force transmitting member of an image forming apparatus; the coupling comprises: the driving force receiving member is capable of being engaged with the connecting frame and/or the positioning boss of the driving force transmitting member to receive the driving force from the driving force transmitting member, and is provided to the base, which is connected to the photosensitive drum. In this application, the driving force receiving member is directly engaged with the link frame and/or the positioning boss for the engagement of the driving force transmitting member and the driving force receiving member is more stable, the received driving force is more sufficient, and the problem of insufficient power is not easily occurred, so that more rotating parts can be provided in the process cartridge.

Description

Drum unit and processing box

Technical Field

The application relates to the technical field of printing consumables, in particular to a drum unit and a processing box.

Background

The process cartridge is a consumable material detachably mountable to an image forming apparatus. The image forming apparatus is provided with a driving force transmission unit including a driving force transmission assembly for transmitting a driving force to the process cartridge and a braking force application assembly capable of applying a load to the photosensitive drum; the corresponding process cartridge is provided with a driving force receiving portion engaged with the driving force transmitting assembly and a braking force receiving portion engaged with the braking force applying assembly.

In the process of the operation of the image forming apparatus, the process cartridge of the above-described structure is liable to suffer from a problem of insufficient driving force due to receiving the braking force, resulting in failure to provide more rotating members (such as a stirring frame for loosening toner, a cleaning member in contact with the photosensitive drum, etc.), and even affecting the developing work.

Disclosure of Invention

The application provides a drum unit and a process cartridge, the drum unit is used for solving the problem that the driving force received by the process cartridge is insufficient.

The drum unit comprises a photosensitive drum and a coupler, wherein the coupler is arranged at the end part of the photosensitive drum and is used for being engaged with a driving force transmission member of imaging equipment;

the coupling includes: a driving force receiving member and a base, the driving force receiving member being engageable with the connecting frame and/or the positioning boss of the driving force transmitting member to receive the driving force from the driving force transmitting member, the driving force receiving member being provided to the base, the base being connected to the photosensitive drum.

In one possible design, the driving force receiving member is a rotation unit provided with an insertion hole; when the positioning boss rotates, the rotating unit locks the positioning boss inserted into the insertion hole; when the positioning boss stops rotating, the rotating unit unlocks the positioning boss inserted into the insertion hole.

In one possible design, the rotation unit includes a connection body provided with a first insertion hole into which the positioning boss can be inserted and a plurality of rolling pockets in which the roller can roll;

the rolling hole is provided with a first rolling groove and a second rolling groove, the rotating unit locks the positioning boss when the rolling shaft rolls from the first rolling groove to the second rolling groove, and the rotating unit unlocks the positioning boss when the rolling shaft rolls from the second rolling groove to the first rolling groove;

and a reset part is further arranged in the rolling hole, and the reset part can drive the rolling shaft to roll from the second rolling groove to the first rolling groove.

In one possible design, the axis of the first rolling groove is at a greater distance from the axis of the connecting body than the axis of the second rolling groove in the radial direction of the connecting body.

In one possible design, the rotation unit includes at least two rotation blocks rotatably connected with the base, a second insertion hole is provided between the rotation blocks and the base, and the rotation blocks can rotate to lock or unlock the positioning boss inserted into the second insertion hole.

In one possible design, the base is provided with a mounting hole, the rotating block comprises a rotating protrusion and a connecting column, the connecting column is eccentrically arranged on the rotating protrusion, and the connecting column is clamped with the mounting hole.

In one possible design, the rotation protrusion has a first cambered surface, and the second insertion hole is formed between adjacent ones of the first cambered surfaces.

In one possible design, the base is further provided with a guide block, and the guide block is used for guiding the rotation of the rotary protrusion; a first annular groove is arranged between the guide block and the base, and the first annular groove is used for being matched with the driving force transmission member.

In one possible design, a thickened portion is provided on the base for abutting with the first engagement member and/or the second engagement member of the imaging apparatus to drive the first engagement member and/or the second engagement member to move relative to the positioning boss.

In one possible design, the driving force receiving member includes a first guide portion for guiding movement of a second engaging member of the image forming apparatus and a second guide portion for guiding movement of the first engaging member of the image forming apparatus;

The first guide part and the second guide part are provided with clamping grooves therebetween, and the clamping grooves are used for accommodating the connecting frame.

In one possible design, the driving force receiving member includes a cylindrical portion provided with an insertion hole, and an engagement portion provided on an outer peripheral wall of the cylindrical portion;

the insertion hole is used for being matched with the positioning boss, and the joint part is used for being abutted with the connecting frame so as to receive driving force from the connecting frame.

In one possible design, a fixing portion is further provided on an outer peripheral wall of the cylindrical portion, the fixing portion being for being engaged with a second engagement member of the image forming apparatus to guide the second engagement member to move.

In one possible design, the base is provided with a mounting groove, a first supporting part and a second supporting part are arranged in the mounting groove, and the height of the second supporting part is higher than that of the first supporting part along the axial direction of the base;

at least part of the driving force receiving member is arranged in the mounting groove, the driving force receiving member further comprises a second main body part connected with the cylindrical part, a supporting rod is arranged on the second main body part, and the supporting rod can be in butt joint with the side wall of the second supporting part, which is higher than the side wall of the first supporting part.

In one possible design, the first supporting portion encloses at least part of the second annular groove, the driving force receiving member further includes a third elastic piece sleeved on the second main body portion, one end of the third elastic piece abuts against the second main body portion, and the other end extends into the second annular groove to abut against the bottom wall of the second annular groove.

In one possible design, the base is provided with a mounting groove, and the driving force receiving member includes: the clamping connection rod is connected to the base and is used for being clamped with the connecting frame; at least part of the moving part is accommodated in the mounting groove, the moving part is provided with a fourth inserting hole and an avoiding groove, the clamping rod penetrates through the avoiding groove, and the fourth inserting hole is used for being matched with the positioning boss; one end of the fourth elastic piece is abutted with the moving part, and the other end of the fourth elastic piece is abutted with the bottom wall of the mounting groove.

In one possible design, the clamping rod is provided with a notch, and the clamping rod is clamped with the connecting frame through the notch.

In one possible design, the moving part is provided with a connecting rod, the fourth elastic piece is sleeved on the connecting rod, and the connecting rod is positioned in the mounting groove and extends out of the mounting groove through a through hole at the bottom of the mounting groove;

The driving force receiving member further includes a stopper, and a portion of the connecting rod extending out of the mounting groove is connected with the stopper.

In one possible design, a guide block for guiding movement of the second engagement member of the image forming apparatus and a pressing block for receiving a pressing force of the second engagement member are provided on an outer peripheral wall of the moving portion.

In one possible design, the base has an inner cavity, a fifth insertion hole and a second communication hole, both of which communicate with the inner cavity, at least part of the driving force receiving member being accommodated in the inner cavity, a part of the driving force receiving member protruding out of the inner cavity through the second communication hole, the fifth insertion hole being for cooperation with the positioning boss;

and a driving part is also arranged in the inner cavity and can drive the driving force receiving component to move along the axial direction of the base.

In one possible design, the driving force receiving member includes: a first receiving rod and a fourth body portion accommodated in the inner cavity, the first receiving rod protruding out of the inner cavity through the second communication hole;

The driving part is a fifth elastic piece, one end of the fifth elastic piece is in butt joint with the bottom wall of the inner cavity, and the other end of the fifth elastic piece is sleeved on the fourth main body part and is in butt joint with the fourth main body part.

In one possible design, the first receiving rod includes a retaining portion and a receiving portion, the retaining portion is located outside the receiving portion along a radial direction of the base, the retaining portion is used for being connected with a clamping block on the driving force transmission member, and the receiving portion is used for being connected with a connecting frame.

The embodiment of the application provides a processing box, which comprises the drum unit.

In this application, the driving force receiving member is directly engaged with the link frame and/or the positioning boss for the engagement of the driving force transmitting member and the driving force receiving member is more stable, the received driving force is more sufficient, and the problem of insufficient power is not easily occurred, so that more rotating parts can be provided in the process cartridge.

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 diagram of an image forming apparatus according to the prior art;

FIG. 2 is an isometric view of FIG. 1;

Fig. 3 is an exploded view of the driving force transmission unit of fig. 1;

fig. 4 is a schematic structural view of the first engagement member and the braking force transmitting member in fig. 3;

fig. 5 is a sectional view of the driving force transmission unit of fig. 3;

fig. 6 is a sectional view of the driving force transmission unit of fig. 3;

fig. 7 is a schematic view of a structure of a process cartridge according to the prior art;

FIG. 8 is an exploded view of FIG. 7;

fig. 9 is a schematic structural view of the driving force transmission member in fig. 3;

fig. 10 is a partial schematic structural view of the driving force transmission unit in fig. 3;

FIG. 11 is an exploded view of the coupling in the drum unit provided herein in a first embodiment;

FIG. 12 is a schematic view of the structure of the connector and shaft of FIG. 11;

FIG. 13 is a schematic view of the construction of the coupling in the drum unit provided herein in a second embodiment;

FIG. 14 is an exploded view of FIG. 13;

FIG. 15 is a schematic view of the construction of the coupling in the drum unit provided herein in a third embodiment;

FIG. 16 is a schematic view of the structure of the coupling in the drum unit provided in the present application in a fourth embodiment;

FIG. 17 is another schematic view of the coupling of FIG. 16;

FIG. 18 is a schematic view of the construction of the coupling in the drum unit provided in the present application in a fifth embodiment;

FIG. 19 is an exploded view of FIG. 18;

FIG. 20 is a schematic view of a portion of the base of FIG. 19;

FIG. 21 is a schematic view of the construction of a coupling in a drum unit provided herein in a sixth embodiment;

FIG. 22 is another schematic view of the coupling of FIG. 21;

FIG. 23 is a cross-sectional view of FIG. 21;

FIG. 24 is a schematic view of a coupling in a drum unit provided herein in a seventh embodiment;

FIG. 25 is a schematic view of the base of FIG. 24;

fig. 26 is a cross-sectional view of fig. 24.

Reference numerals:

1-a base;

11-mounting slots;

11 a-a first support;

11 b-a second support;

11 c-a second annular groove;

11 d-limit grooves;

12-thickening part;

13-mounting holes;

14-a guide block;

15-limiting blocks;

16-a first annular groove;

17-lumen;

18-a fifth insertion hole;

19-a second communication hole; 21-a fifth elastic member; 41-a first receiving bar;

41 a-a drop-off prevention part;

41 b-a receiving section; 42-a fourth body portion; 61-clamping a connecting rod;

61 a-notch; 62-a moving part;

62 a-fourth insertion holes;

62 b-connecting rod;

62 c-a guide block;

62 d-pushing the block;

62 e-avoiding grooves; 63-fourth elastic members; 64-limiting pieces;

71-a cylindrical portion;

72-joint;

72 a-a junction surface; 73-a fixing part;

74-a second body portion; 75-supporting rods;

76-third elastic member 81-first guide portion;

81 a-a first guide surface;

82-a second guide;

82 a-a second guide surface;

83-a clamping groove;

9-a rotation unit;

91-linker;

911-rolling holes;

911 a-a first rolling groove;

911 b-a second rolling groove;

912-a reset portion;

913-a first insertion hole;

92-rolling shafts;

93-sleeve;

94-rotating the block;

94 a-a second insertion hole;

941-rotating the protrusions;

941 a-a first cambered surface;

941 b-a second cambered surface;

942-connecting the column;

942 a-a deformation groove; 100-a process cartridge;

100Y-a first process cartridge;

100M-a second process cartridge;

100C-a third process cartridge;

100K-fourth process cartridge; 104-a photosensitive drum;

106-a developing roller;

108-a photosensitive unit;

109-a developing unit;

115-drum holding frame; 116-drive side cap member; 117-non-drive side cap member; 125-developing frame;

142-drum flange;

143-drum coupling;

160-door cover

170-a main assembly;

171-a tray;

180-a driving force transmission member;

180 a-a first flange portion;

180 b-a first tab;

180 c-a body portion;

180 d-bump;

180 e-connecting frame;

180 f-contact surface;

180 g-first communication holes;

180 h-clamping block

180 i-positioning bosses; 185-a development drive coupling; 201-a rotating member;

201 a-a second tab;

201 b-fitting portion; 202-a support shaft;

203-a driving force transmission unit; 204-a first engagement member;

204 a-fourth flange portions;

204 b-a first joint;

204 c-a stop groove;

204 d-a first body portion;

204 e-fourth tab;

206-a braking member;

206 a-a fixed side;

206 b-a rotating side;

206 c-engagement holes;

206 d-end face;

207-a braking force transmitting member;

207 a-a third flange portion;

207 b-shaft portion;

207 e-a third tab;

207 f-end;

208-a second engagement member;

208 a-a ring portion;

208 b-a second joint;

208 c-stop protrusions;

208 d-inwardly protruding;

210-a second elastic member;

211-a first elastic member;

212-restriction.

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.

As shown in fig. 1 and 2, there is an image forming apparatus M including a main assembly 170, a tray 171, and a door 160, the main assembly 170 having a receiving portion, a separating mechanism, a transfer unit, and the like provided therein, the tray 171 being capable of receiving the process cartridge 100 and moving relative to the main assembly 170 to mount the process cartridge 100 into the receiving portion of the main assembly 170. The door 160 is provided at an outer side of the main assembly 170, and is capable of opening or closing the receiving part of the main assembly 170.

Among them, the tray 171 can generally accommodate four detachably mounted process cartridges 100, namely, a first process cartridge 100Y, a second process cartridge 100M, a third process cartridge 100C, and a fourth process cartridge 100K, with the four process cartridges 100 being arranged substantially horizontally. The process cartridge 100 stores therein a developer, and is capable of receiving a rotational driving force of the image forming apparatus M when the process cartridge 100 is mounted in the accommodating portion of the main assembly 170, so that the image forming apparatus M can perform image formation using the developer in the process cartridge 100. Meanwhile, the image forming apparatus M supplies bias voltages (charging bias, developing bias, etc.) to the first to fourth process cartridges 100 (100Y, 100M, 100C, 100K), respectively.

Specifically, the tray 171 is configured to be movable in a substantially horizontal direction in a state in which the image forming apparatus M is mounted on a horizontal surface. The tray 171 can be detached from or attached to the image forming apparatus M by opening the door 160 of the image forming apparatus M.

The main assembly 170 is provided with a driving force transmitting unit 203, and the driving force transmitting unit 203 is capable of engaging with the process cartridge 100 and transmitting a driving force to the process cartridge 100 when the process cartridge 100 is mounted in the accommodating portion of the main assembly 170. Wherein the driving force transmitting unit 203 comprises a driving force transmitting assembly and a braking force applying assembly.

As shown in fig. 3, the driving force transmission assembly includes a rotation member 201 and a driving force transmission member 180, the rotation member 201 is rotatably supported on a support shaft 202, the support shaft 202 is fixed to the main assembly 170, and a motor (not shown) within the main assembly 170 can drive the rotation member 201 to rotate.

The driving force transmitting member 180 includes a cylindrical body portion 180c and a first flange portion 180a provided at an end portion thereof, the rotating member 201 having a fitting portion 201b, the first flange portion 180a being capable of being fitted with the fitting portion 201b and being supported by the fitting portion 201 b. The driving force transmission member 180 is further provided with a first protrusion 180b protruding from the first flange portion 180a, the rotation member 201 has a second protrusion 201a, and the first protrusion 180b can contact the second protrusion 201a, thereby transmitting driving force from the rotation member 201 to the driving force transmission member 180, and rotation of the driving force transmission member 180 by the rotation member 201 is achieved.

As shown in fig. 3, the brake force application assembly includes a brake member 206, a first engagement member 204, a second engagement member 208, and a brake force transmitting member 207. Wherein the braking member 206 includes a fixed side 206a and a rotating side 206b, the fixed side 206a is fixedly connected with the support shaft 202, the rotating side 206b is capable of rotating with respect to the fixed side 206a and generating a braking force, and a method of generating the braking force may be appropriately selected from those using friction and viscosity.

The first engaging member 204 and the second engaging member 208 are used to apply a braking force to the process cartridge 100. The first engaging member 204 has a cylindrical first main body portion 204d, a stopper groove 204c is provided on the first main body portion 204d, the second engaging member 208 has a circular ring portion 208a, a stopper protrusion 208c is provided on the circular ring portion 208a, and the stopper groove 204c and the stopper protrusion 208c can be assembled together by a snap-fit manner so that the first engaging member 204 and the second engaging member 208 move synchronously.

Further, the first engaging member 204 is provided with a first engaging portion 204b protruding in the form of a claw with respect to the first main body portion 204d, and the second engaging member 208 is provided with a second engaging portion 208b protruding in the form of a claw with respect to the annular portion 208 a. Specifically, the first engagement member 204 and the second engagement member 208 are provided inside the driving force transmission member 180, and the second engagement member 208 is located inside the first engagement member 204.

The brake transmitting member 207 includes a shaft portion 207b and a third flange portion 207a provided to the shaft portion 207b, the shaft portion 207b passing through holes in the middle of the first and second engaging members 204 and 208 and being connected to the rotation side 206b of the brake member 206 so as to be able to transmit braking force to the first and second engaging members 204 and 208. Specifically, the shaft portion 207b has a non-circular cross section, the brake member 206 has an engagement hole 206c, and the shaft portion 207b is engageable with the engagement hole 206c to integrally rotate the brake transmitting member 207 and the brake member 206.

As shown in fig. 4, the third protrusion 207e is provided on the third flange portion 207a of the brake transmission member 207, and the first engagement member 204 has the fourth flange portion 204a, and the fourth protrusion 204e is provided on the fourth flange portion 204 a.

As shown in fig. 5, the third flange portion 207a is provided between the fourth flange portion 204a and the annular portion 208a with a play G between the fourth flange portion 204a and the annular portion 208a so that the first engagement member 204 and the second engagement member 208 can move in the axial direction M1 with respect to the brake transmitting member 207. The axial direction M1 is a rotation axis of the driving force transmission member 180. Among the directions of the axis M1, the direction from the driving force transmission member 180 toward the rotation member 201 is the M1A direction, and the direction from the rotation member 201 toward the driving force transmission member 180 is the M1B direction.

When the third protrusion 207e is engaged with the fourth protrusion 204e, the brake transmission member 207 can transmit a braking force to the first engagement member 204; when the third protrusion 207e is offset or separated from the fourth protrusion 204e in the axial direction M1, the first engagement member 204 and the second engagement member 208 do not receive the braking force from the brake transmitting member 207.

Further, as shown in fig. 5 and 6, the braking force applying assembly further includes a first elastic member 211 and a second elastic member 210 capable of generating a pushing force. One end of the first elastic piece 211 abuts against the end surface 206d of the stopper member 206, and the other end abuts against the fourth flange portion 204 a. The first elastic piece 211 is in a compressed state, and applies an elastic force to the first engagement member 204 in the M1B direction, which can keep the third protrusion 207e engaged with the fourth protrusion 204 e. One end of the second elastic piece 210 abuts against the end surface 206d of the stopper member 206, and the other end abuts against the third flange portion 207 a. The second elastic piece 210 is also in a compressed state, and applies an elastic force to the brake transmitting member 207 in the M1B direction, which can bring the end 207f of the brake transmitting member 207 into abutment with the contact surface 180f of the driving force transmitting member 180.

Since the driving force transmitting member 180 can receive the urging force from the first elastic piece 211 and the second elastic piece 210 through the brake transmitting member 207, the driving force transmitting member 180 tends to move in the M1B direction. The driving force transmission unit 203 is further provided with a restriction portion 212 to restrict the movement of the driving force transmission member 180 in the M1B direction, thereby restricting the falling-off of the driving force transmission member 180.

Specifically, when the driving force transmitting member 180 moves a certain distance in the M1B direction, the first flange portion 180a contacts the restriction portion 212, thereby restricting movement and falling off of the driving force transmitting member 180; when the driving force transmitting member 180 receives a force in the M1A direction in this state, the driving force transmitting member 180 may move in the M1A direction while compressing the first and second elastic pieces 211 and 210.

Preferably, the first elastic member 211 and the second elastic member 210 may be compression coil springs.

Further, the first engaging member 204 and the second engaging member 208 can move and retract in the M1A direction with respect to the brake transmitting member 207 and the driving force transmitting member 180 while compressing the first elastic piece 211 and the second elastic piece 210.

When the movement of the first engagement member 204 and the second engagement member 208 in the M1A direction exceeds the width of the gap G, the brake transmission member 207, the driving force transmission member 180 can move in the M1A direction together with the first engagement member 204 and the second engagement member 208.

As shown in fig. 7 and 8, there is a conventional process cartridge 100 including a photosensitive unit 108 and a developing unit 109, the photosensitive unit 108 and the developing unit 109 being rotatably connected to each other. Among them, the photosensitive unit 108 includes a drum holding frame 115 (one of process cartridge cases) and a drum unit rotatably supported on the drum holding frame 115, and the drum unit includes the photosensitive drum 104, a drum coupling 143, and a drum flange 142. The drum unit is rotatably supported by a driving side casing cover member 116 and a non-driving side casing cover member 117 provided at opposite ends of the process cartridge 100.

Specifically, the drum coupling 143 protrudes with respect to the driving side cap member 116 such that when the process cartridge 100 is mounted in the receiving portion of the main assembly 170, the drum coupling 143 can engage with the driving force transmitting member 180 to receive the driving force from the driving force transmitting member 180, thereby driving the photosensitive drum 104 to rotate.

The developing unit 109 includes a developing frame 125 (one of the process cartridge housings) and a developing roller 106 rotatably supported on the developing frame 125, the developing roller 106 and the photosensitive drum 104 facing each other to enable a developing operation.

Specifically, the developing unit 109 further includes a developing coupling member, and the main assembly 170 is provided with a developing drive coupling 185 engageable with the developing coupling member to receive a driving force from the image forming apparatus M to drive the developing roller 106 to rotate.

Further, when the door 160 is in the closed state, the driving force transmitting member 180 and the developing drive coupling 185 can protrude with respect to the side wall of the accommodating portion, thereby facilitating engagement with the drum coupling 143 and the developing coupling member. When the door 160 is in the opened state, the driving force transmitting member 180 and the developing driving coupling 185 can be retracted with respect to the side wall of the receiving portion, so that insertion or removal of the tray 171 is not hindered.

As shown in fig. 9 and 10, a protrusion 180d, a connection frame 180e, a positioning boss 180i, and a first communication hole 180g are provided in the body portion 180c of the driving force transmission member 180, the protrusion 180d is provided at an interval on an inner wall of the body portion 180c, one end of the connection frame 180e is connected to the protrusion 180d, and the other end is connected to the positioning boss 180i, so that the positioning boss 180i can be fixed to a central position of the body portion 180 c. Further, the first engaging member 204 and the second engaging member 208 can pass through the first communication hole 180g, and the connection frame 180e does not interfere with the first engaging member 204 and the second engaging member 208. The second engagement member 208 is provided with an inward protrusion 208d extending toward the positioning boss 180i at an end of the second engagement portion 208 b.

The present application provides a drum unit provided with a coupling of a different structure from the drum coupling 143 in the related art.

The drum unit includes a photosensitive drum 104 and a coupling provided at an end of the photosensitive drum 104 for engagement with the driving force transmission member 180. The coupling comprises: a driving force receiving member and a base 1, the driving force receiving member being engageable with the connecting frame 180e and/or the positioning boss 180i to receive the driving force from the driving force transmitting member 180, the driving force receiving member being provided to the base 1, the base 1 being connected to the photosensitive drum 104.

In this application, the driving force receiving member is directly engaged with the coupling frame 180e and/or the positioning boss 180i, so that the engagement of the driving force transmitting member 180 with the driving force receiving member is more stable, the received driving force is more sufficient, and the problem of insufficient power is less likely to occur, thereby enabling more rotational parts to be provided in the process cartridge 100.

Meanwhile, the drum unit in the present application does not receive the braking force applied by the image forming apparatus M in the process of receiving the driving force, so that the process cartridge 100 can further be provided with more rotating parts or cleaning devices contacting the photosensitive drum 104, and the defects of insufficient power and the like are avoided, and the process cartridge has a certain general performance.

With respect to the specific structure of the drum unit, various embodiments are provided herein.

Example 1

In the first embodiment, as shown in fig. 11, the coupling includes a base 1 and a rotation unit 9, a mounting groove 11 is formed in the base 1, and the rotation unit 9 is disposed in the mounting groove 11. As shown in fig. 12, the rotation unit 9 includes a coupling body 91 and rollers 92, the coupling body 91 is provided with a first insertion hole 913 and a plurality of rolling pockets 911, a positioning boss 180i can be inserted into the first insertion hole 913, the rollers 92 can roll in the rolling pockets 911, and the number of the rolling pockets 911 and the number of the rollers 92 are equal.

Specifically, the rolling hole 911 has a first rolling groove 911a and a second rolling groove 911b, when the roller 92 rolls from the first rolling groove 911a to the second rolling groove 911b, the rotation unit 9 locks the positioning boss 180i, and when the roller 92 rolls from the second rolling groove 911b to the first rolling groove 911a, the rotation unit 9 unlocks the positioning boss 180i. A reset portion 912 is also provided in the rolling hole 911, and the reset portion 912 itself has elasticity, so that the roller 92 can be driven to roll from the second rolling groove 911b to the first rolling groove 911a.

The driving force transmission process is as follows: when the positioning boss 180i enters the first insertion hole 913 and starts rotating clockwise (as viewed from the direction of M1B), the positioning boss 180i drives the plurality of rollers 92 to rotate clockwise in the rolling hole 911 through rolling friction force due to rolling connection between the positioning boss 180i and the rollers 92, and the reset portion 912 can clamp the rollers 92 as the plurality of rollers 92 rotate clockwise to the second rolling groove 911B due to the initial positioning of the rollers 92 in the first rolling groove 911a, so that the rollers 92 stop rotating, and further the plurality of rollers 92 are clamped on the circumferential side wall of the positioning boss 180i, thereby realizing locking of the rotating unit 9 and the positioning boss 180i and driving force transmission of the positioning boss 180i to the coupling and the photosensitive drum 104.

When the positioning boss 180i stops rotating, the plurality of rollers 92 can rotate in the direction of the first rolling groove 911a under the elastic force of the reset portion 912 until the positioning boss 180i is released, so as to unlock the rotating unit 9 and the positioning boss 180i, and enable the positioning boss 180i of the driving force transmission member 180 to withdraw from the rotating unit 9.

More specifically, the distance from the axis of the first rolling groove 911a to the axis of the connecting body 91 is greater than the distance from the axis of the second rolling groove 911b to the axis of the connecting body 91 in the radial direction of the connecting body 91, so that the rotating unit 9 can lock the positioning boss 180i when the roller 92 is positioned in the second rolling groove 911 b.

In addition, the rotating unit 9 further includes a sleeve 93, the sleeve 93 is sleeved on the outer side of the connecting body 91, and the positioning boss 180i can pass through the sleeve 93 and then enter the first insertion hole 913, so that the sleeve 93 can provide protection for the connecting body 91 and the roller 92.

Preferably, the base 1 is provided with the thickened portions 12, and the thickened portions 12 are symmetrically disposed at two sides of the base 1 and extend along the radial direction of the base 1, so that when the thickened portions 12 interfere with the second engaging member 208, the thickened portions 12 can press down the second engaging member 208. At the same time, the thickened portion 12 can also increase the strength of the mounting groove 11.

Specifically, the coupling-to-driving force transmission unit 203 engagement process is divided into two cases:

in the first case, when the coupling is at a position where it can engage with the driving force transmission unit 203, that is, when the thickened portion 12 is at a position where it does not interfere with the second engagement member 208 (when the thickened portion 12 is at a gap on both sides of the second engagement member 208), the driving force transmission member 180 protrudes in the direction M1B to be directly engaged with the coupling after the door 160 is closed.

In the second case, the coupling is at a position where it cannot be engaged with the driving force transmission unit 203, that is, the two thickened portions 12 interfere with the second engaging member 208, when the driving force transmission member 180 protrudes in the direction M1B after the door cover 160 is closed, the second engaging member 208 is pressed down in the direction M1A by the thickened portions 12, and the first engaging member 204 moves synchronously with the second engaging member 208. Meanwhile, when the driving force transmission unit 203 starts to rotate, the coupling is brought into an engageable position with the driving force transmission unit 203.

In the first embodiment, the rotation unit 9 locks the positioning boss 180i, so that the rotation unit 9 and the positioning boss 180i can be coaxially connected, and further, the connection stability between the driving force transmission unit 203 and the photosensitive drum 104 and the stability of transmitting the driving force are improved, so that the driving connection is stable, and the driving transmission is smooth.

Example two

The second embodiment differs from the first embodiment in that: the rotation unit 9 includes at least two rotation blocks 94. As shown in fig. 13 and 14, the rotating block 94 is rotatably connected to the base 1, a second insertion hole 94a is provided between the rotating block 94 and the base 1, and the rotating block 94 can be rotated to lock or unlock the positioning boss 180i inserted into the second insertion hole 94 a.

Specifically, the base 1 is provided with a mounting hole 13, the rotating block 94 includes a rotating protrusion 941 and a connecting post 942, the connecting post 942 is eccentrically disposed on the rotating protrusion 941, and the connecting post 942 is clamped with the mounting hole 13.

In the present embodiment, the connection post 942 is made of an elastic material, and an end of the connection post 942 remote from the rotation protrusion 941 is in a shape of an inverted circular truncated cone. The inverted circular truncated cone-shaped part is deformed to pass through the mounting hole 13 by pressing the connecting column 942, and is deformed in a restoring way after passing through the mounting hole 13, and the end face of the inverted circular truncated cone-shaped part is clamped with the mounting hole 13, so that the rotary block 94 is connected with the base in a 1-rotation way.

Further, in order to reduce the difficulty of matching the connection post 942 with the mounting hole 13, the connection post 942 is provided with a deformation groove 942a.

More specifically, the rotation protrusion 941 has inclined first cambered surfaces 941a, and the second insertion holes 94a are formed between adjacent ones of the first cambered surfaces 941 a.

As shown in fig. 13, the second insertion hole 94a formed by at least two first cambered surfaces 941a is in the shape of an inverted truncated cone, the end of the second insertion hole 94a with a smaller diameter is close to the end face of the base 1, and the end of the second insertion hole 94a with a larger diameter is far away from the end face of the base 1, i.e. the first cambered surface 941a is inclined obliquely upward from the end face of the base 1 toward the direction close to the positioning boss 180i, so that as the positioning boss 180i goes deep into the second insertion hole 94a, the rotating boss 941 rotates clockwise to make the first cambered surface 941a abut against the peripheral wall of the positioning boss 180i, thereby locking the positioning boss 180i.

The rotation boss 941 further has a second arc surface 941b, and the second arc surface 941b can abut against an end inner wall of the body portion 180c when the coupling is engaged with the driving force transmission member 180. Specifically, as the positioning boss 180i gradually enters the second insertion hole 94a, the rotational projection 941 rotates to bring the second arc surface 941b into abutment with the end inner wall of the body portion 180c, so that the rotational projection 941 can receive the driving force from the driving force transmitting member 180 through the second arc surface 941 b.

Preferably, as shown in fig. 13, the base 1 is further provided with a guide block 14, where the guide block 14 can abut against the rotation protrusion 941 and guide the rotation of the rotation protrusion 941, so that the rotation process of the rotation protrusion 941 is more stable and smooth. Further, the guide block 14 and the base 1 have a first annular groove 16 therebetween, and the first annular groove 16 is capable of accommodating an annular end portion of the body portion 180c, that is, an inner peripheral wall of the base 1 abuts against an outer peripheral wall of the end portion of the body portion 180c, and the second cambered surfaces 941b of the guide block 14 and the rotation boss 941 abut against the inner peripheral wall of the end portion of the body portion 180c, whereby the driving force from the driving force transmitting member 180 is received by friction forces of the three against the end portion of the body portion 180 c. At the same time, the inner peripheral wall of the base 1 abuts against the outer peripheral wall of the end portion of the body portion 180c, and the body portion 180c can be prevented from being deformed by the abutment force of the second cambered surface 941 b.

Preferably, the base 1 is further provided with a limiting block 15, and the limiting block 15 is located on a counterclockwise rotating path of the rotating protrusion 941 and can abut against the rotating protrusion 941 so that the rotating protrusion 941 can only rotate clockwise after receiving the insertion force of the positioning boss 180 i.

The driving force transmission process is as follows: when the process cartridge 100 is mounted to the main assembly 170 of the image forming apparatus M, the driving force transmitting member 180 protrudes in the direction of M1B, and the positioning boss 180i enters the second insertion hole 94a along the first arc surface 941 a. Since the second insertion hole 94a is in the shape of an inverted circular truncated cone, the first arc surface 941a receives the force of the positioning boss 180i as the positioning boss 180i gradually goes deep, so that the rotation protrusion 941 rotates clockwise (as viewed from the direction M1B), and the second arc surface 941B abuts against the inner wall of the driving force transmitting member 180. At this time, the driving force transmitting member 180 is locked with the rotation unit 9, and the driving force of the driving force transmitting unit 203 can be transmitted to the coupling, thereby driving the rotation of the photosensitive drum 104.

When the positioning boss 180i stops rotating, the rotation protrusion 941 rotates to release the abutment of the second arc surface 941b with the inner peripheral wall of the end portion of the body portion 180c, and the second insertion hole 94a releases the lock of the positioning boss 180i, so that the driving force transmitting member 180 can be separated from the coupling.

Example III

As shown in fig. 15, in the third embodiment, the driving force receiving member includes a first guide portion 81 provided at an end of the base 1, the first guide portion 81 for guiding movement of the second engaging member 208 of the driving force transmitting unit 203, and a second guide portion 82 for guiding movement of the first engaging member 204 of the driving force transmitting unit 203. A clamping groove 83 is provided between the first guide portion 81 and the second guide portion 82, and the clamping groove 83 is used for accommodating the connecting frame 180e.

In the present embodiment, as shown in fig. 15, when the link frame 180e is accommodated in the engagement groove 83, the second guide portion 82 abuts against the link frame 180e so that the driving force receiving member can receive the driving force of the driving force transmitting member 180.

Specifically, the first guide portion 81 has a first guide surface 81a, and the first guide surface 81a is inclined obliquely upward counterclockwise (seen from the direction M1B) about the central axis of the base 1. The second guide portion 82 has a second guide surface 82a, and the second guide surface 82a is inclined obliquely upward counterclockwise (seen from the direction M1B) about the central axis of the base 1.

The driving force transmission process is as follows: when the process cartridge 100 is mounted to the main assembly 170 of the image forming apparatus M, the driving force transmitting member 180 protrudes in the direction M1B, and when the driving force transmitting member 180 protrudes a certain distance, the driving force receiving member interferes with the first engaging member 204 and the second engaging member 208 and presses the first engaging member 204 and the second engaging member 208 down into the driving force transmitting unit 203 a certain distance.

When the driving force transmission unit 203 starts rotating, the first guide portion 81 is engaged with the second engaging member 208, and the second engaging member 208 moves along the first guide surface 81a to push the second engaging member 208 and the first engaging member 204 to be separated from the projection 180 d; after the first engaging member 204 is separated from the bump 180d by a certain distance, the second guide portion 82 is engaged with the first engaging member 204, and the first engaging member 204 moves along the second guide surface 82a to continue to push the first engaging member 204 and the second engaging member 208 so that they are separated farther from the bump 180 d.

When the distance between the first engaging member 204 and the second engaging member 208 and the protrusion 180d is sufficient, the driving force receiving member does not interfere with the first engaging member 204 and the second engaging member 208, and the driving force transmitting member 180 continues to extend toward the direction M1B, so that the connecting frame 180e is clamped in the clamping groove 83, so that the driving force transmitting member 180 transmits the driving force to the coupling through the connecting frame 180e, and further drives the photosensitive drum 104 to rotate.

Example IV

In the fourth embodiment, as shown in fig. 16, the driving force receiving member includes a cylindrical portion 71 and an engagement portion 72 provided on an outer peripheral wall of the cylindrical portion 71, and an insertion hole is provided on the cylindrical portion 71. The positioning boss 180i can be inserted into an insertion hole in the cylindrical portion 71, and the coupling 180e can be abutted against the engagement portion 72 so that the coupling receives the driving force from the coupling 180 e.

In the present embodiment, the engaging portion 72 has the engaging surface 72a, and when the positioning boss 180i is engaged with the insertion hole, the engaging portion 72 can be inserted into the first communication hole 180g, and with the rotation of the driving force transmitting member 180, the engaging surface 72a of the engaging portion 72 abuts against the side surface of the connecting frame 180e, so that the coupling can receive the driving force from the driving force transmitting unit 203. Specifically, the cylindrical portion 71 is substantially cylindrical, and the engagement portion 72 is substantially of an inverted L-shaped structure.

Preferably, two engaging portions 72 are provided on the outer peripheral wall of the cylindrical portion 71, and the two engaging portions 72 are provided symmetrically with respect to the center of the axis of the cylindrical portion 71, so that both engaging portions 72 can engage with the connecting frame 180e, thereby better receiving the driving force from the driving force transmitting unit 203.

The driving force transmission process is as follows: when the process cartridge 100 is mounted to the main assembly 170 of the image forming apparatus M, the driving force transmitting member 180 protrudes in the direction M1B such that the positioning boss 180i is fitted into the insertion hole and the engaging portion 72 is fitted into the first communication hole 180g (the engaging portion 72 is located between the connecting frame 180e and the second engaging member 208). When the driving force transmission member 180 rotates counterclockwise, the engaging portion 72 abuts against the link frame 180e, so that the driving force transmission member 180 transmits a driving force to the coupling through the link frame 180e, thereby driving the rotation of the photosensitive drum 104.

Optionally, a fixing portion 73 is further provided on an outer peripheral wall of the cylindrical portion 71, and the fixing portion 73 can be engaged with the second engaging member 208 to guide the second engaging member 208 to move.

As shown in fig. 17, the fixing portion 73 is a protrusion protruding in the radial direction on the cylindrical portion 71, and a buckle (not shown) may be provided on the fixing portion 73, and a groove (not shown) may be provided on the second engagement member 208. When the driving force transmitting member 180 is engaged with the coupling, the fixing portion 73 and the second engaging member 208 can be engaged by the snap and the groove, so that the driving force transmitting member 180 and the coupling remain stably connected and are not easily disengaged. Alternatively, one of the fixing portion 73 and the second engaging member 208 is provided with a protrusion (not shown), and the other is provided with a groove (not shown) corresponding thereto, so that the driving force transmitting member 180 and the coupling are stably connected by the snap fit of the groove and the protrusion, and are not easily disengaged.

Specifically, two fixing portions 73 are provided, and the two fixing portions 73 are symmetrically provided on the outer peripheral wall of the cylindrical portion 71.

More specifically, when the driving force transmitting member 180 is engaged with the coupling, the fixing portion 73 first protrudes into the first communication hole 180g, and the fixing portion 73 is located between the engaging portion 72 and the second engaging member 208. When the driving force transmitting member 180 rotates counterclockwise, the fixing portion 73 is engaged with the second engaging member 208. When the driving force transmitting member 180 is separated from the coupling, the driving force transmitting member 180 rotates clockwise to release the fixed portion 73 from the engagement with the second engagement member 208.

Example five

The fifth embodiment improves the coupling of the fourth embodiment. As shown in fig. 18, in the fifth embodiment, the driving force receiving member includes a cylindrical portion 71 and an engaging portion 72 provided on an outer peripheral wall of the cylindrical portion 71, an insertion hole into which a positioning boss 180i is inserted is provided on the cylindrical portion 71, the engaging portion 72 is spirally extended along an outer peripheral surface of the cylindrical portion 71, and a tip of the engaging portion 72 in a hook shape protrudes from an end face of the cylindrical portion 71.

When the process cartridge 100 is mounted to the main assembly 170 of the image forming apparatus M, the driving force transmitting member 180 protrudes in the direction M1B, at which time the tip of the engaging portion 72 interferes with the second engaging member 208, and therefore the tip of the engaging portion 72 abuts against the second engaging member 208, so that the second engaging member 208 and the first engaging member 204 stop moving toward the coupling, the driving force transmitting member 180 continues to move toward the coupling, so that the first engaging member 204 is disconnected from the braking force transmitting member 207, and the first engaging member 204 and the second engaging member 208 are shifted to a state of not receiving braking force. As the driving force transmitting member 180 continues to move, the tip of the engaging portion 72 protrudes between the second engaging member 208 and the link frame 180e and abuts against the side face of the link frame 180e, so that the driving force transmitting member 180 transmits driving force to the driving force receiving member through the link frame 180 e.

As shown in fig. 19 and 20, the base 1 includes an end cover and a hub, a mounting groove 11 is provided between the end cover and the hub, a first supporting portion 11a and a second supporting portion 11b are provided in the mounting groove 11, and the height of the second supporting portion 11b is higher than the height of the first supporting portion 11a in the axial direction of the base 1. At least part of the driving force receiving member is mounted in the mounting groove 11, the driving force receiving member further comprises a second main body part 74 connected with the cylindrical part 71, a supporting rod 75 is arranged on the second main body part 74, and the supporting rod 75 can be abutted with the side wall of the second supporting part 11b higher than the side wall of the first supporting part 11a, so that the driving force receiving member can drive the base 1 to rotate, and further the photosensitive drum is driven to rotate.

Preferably, the plurality of first supporting portions 11a are arranged in an annular arrangement, a through hole is formed in the center of the first supporting portion, and the two second supporting portions 11b are symmetrically arranged. An end of the second body portion 74 remote from the cylindrical portion 71 can be inserted into a through hole in the center of the first support portion 11 a.

Further, the first supporting portion 11a encloses at least a portion of the second annular groove 11c, the driving force receiving member further includes a third elastic element 76 sleeved on the second main body portion 74, one end of the third elastic element 76 abuts against the second main body portion 74, and the other end extends into the second annular groove 11c to abut against the bottom wall of the second annular groove 11 c.

The third elastic piece 76 can maintain the state in which the cylindrical portion 71 protrudes out of the mounting groove 11, and can adjust the length of the cylindrical portion 71 protruding out of the mounting groove 11 during engagement of the driving force transmitting member 180 with the driving force receiving member, making the driving force transmitting member 180 and the driving force receiving member more easily engaged. Wherein the third elastic member 76 may be a torsion spring.

Specifically, as shown in fig. 20, a limiting groove 11d is formed in the first supporting portion 11a, the limiting groove 11d is communicated with the second annular groove 11c, and the end portion of the torsion spring extends into the limiting groove 11d, so that the torsion spring is limited, and the torsion spring cannot fall off from the second annular groove 11 c.

In the present embodiment, the engagement of the driving force transmitting member 180 and the driving force receiving member is more stable, the two are less likely to fall off from each other, and the power transmission is more stable.

Example six

In the sixth embodiment, as shown in fig. 21 to 23, the driving force receiving member includes: the clamping rod 61, the moving part 62 and the fourth elastic piece 63, the clamping rod 61 is connected to the base 1, a notch 61a is arranged on the clamping rod 61, and the notch 61a enables the clamping rod 61 to be clamped with the connecting frame 180e so as to receive the driving force from the driving force transmission member 180. Wherein the clamping bar 61 may be provided in one or more, preferably two.

The base 1 is provided with an installation groove 11, at least a part of the moving part 62 is accommodated in the installation groove 11, the moving part 62 is provided with a fourth insertion hole 62a and an avoidance groove 62e, the positioning boss 180i can be inserted into the fourth insertion hole 62a, the clamping rod 61 passes through the avoidance groove 62e, one end of the fourth elastic member 63 is abutted with the moving part 62, and the other end is abutted with the bottom wall of the installation groove 11.

In the present embodiment, as shown in fig. 21 to 23, when the moving portion 62 receives the pushing force of the driving force transmission member 180, the moving portion 62 can compress the fourth elastic piece 63 to move toward the base 1, and the click rod 61 is projected from the escape groove 62e so as to be able to contact with the link frame 180 e. Meanwhile, the fourth elastic piece 63 can restore the moving portion 62 when the driving force transmitting member 180 is separated from the moving portion 62.

Specifically, as shown in fig. 23, a through hole is formed in the bottom of the mounting groove 11, the moving part 62 has a connecting rod 62b, the fourth elastic member 63 is sleeved on the outer periphery of the connecting rod 62b, and the connecting rod 62b is located in the mounting groove 11 and extends out of the mounting groove 11 through the through hole in the bottom of the mounting groove 11 into the base 1. The portion of the connecting rod 62b extending out of the mounting groove 11 is connected to a stopper 64, and the stopper 64 can restrict the range of movement of the moving portion 62 in the axial direction thereof, thereby preventing the moving portion 62 from falling out of the mounting groove 11. Wherein, the limiting member 64 may be a C-shaped clamp spring or other limiting structure.

As shown in fig. 21 and 22, the guide block 62c and the pressing block 62d are provided on the outer peripheral wall of the moving portion 62, the guide block 62c has a spiral inclined surface, the guide block 62c is capable of guiding the second engaging member 208 to move in the rotational direction thereof by the spiral inclined surface, and the pressing block 62d is for receiving the urging force of the second engaging member 208 so that the moving portion 62 moves in the direction approaching the base 1.

Preferably, at least a portion of the click-on lever 61 is spaced from the axis M1 by a distance longer than the distance from the guide block 62c to the axis M1.

first case: the projection 180d approaches the first engaging member 204, and after the driving force transmitting member 180 is extended a certain distance in the M1B direction, the second engaging member 208 is partially abutted against the guide block 62c and partially abutted against the pushing block 62d, and the first engaging member 204 and the second engaging member 208 are moved in the direction approaching the braking member 206 (i.e., the M1A direction) against the elastic force of the first elastic piece 211 under the force of the guide block 62c and the pushing block 62d, so that the first engaging member 204 is disconnected from the braking transmitting member 207; at the same time, the first and second engagement members 204, 208 may move together away from the protrusion 180d in their rotational direction, such that a gap is created between the protrusion 180d and the first and second engagement members 204, 208.

When the driving force transmitting member 180 continues to extend along the direction M1B, the forces of the guide block 62c and the pushing block 62d are insufficient to overcome the elastic forces of the first elastic element 211 and the second elastic element 210 at the same time, so that the pushing block 62d receives the force of the second engaging member 208, so that the moving portion 62 moves toward the direction M1B to expose the engaging rod 61, so that the engaging rod 61 can engage with the connecting frame 180e through the notch 61a, and the driving force transmitting member 180 transmits the driving force to the coupling through the connecting frame 180e, and the photosensitive drum 104 is driven to rotate.

Second case: under the force of the guide block 62c and the pushing block 62d, the first engaging member 204 and the second engaging member 208 are insufficient to overcome the elastic force of the first elastic piece 211, and the first engaging member 204 and the second engaging member 208 do not move in the direction M1A, and the first engaging member 204 and the second engaging member 208 are moved away from the boss 180d together only in the rotational direction thereof.

Meanwhile, when the driving force transmitting member 180 continues to extend in the M1B direction, the pressing block 62d receives the force of the second engaging member 208, so that the moving portion 62 moves in the M1B direction, thereby exposing the click lever 61. At this time, the first engaging member 204 and the second engaging member 208 interfere with the click-on lever 61, so that the click-on lever 61 pushes the first engaging member 204 and the second engaging member 208 to move in the direction of M1A until the notch 61A of the click-on lever 61 can engage with the connecting frame 180e, so that the driving force transmitting member 180 transmits driving force to the coupling through the connecting frame 180e, thereby driving the rotation of the photosensitive drum 104.

After the click-on lever 61 is engaged with the connecting frame 180e, the second engagement member 208 is always urged by the urging block 62d, so that the first engagement member 204 and the brake transmission member 207 are always in a disconnected state, realizing that the coupling is configured not to receive braking force.

Example seven

As shown in fig. 9, the driving force transmission member 180 is further provided with a catching block 180h, and the catching block 180h is provided at the bottom of the side wall of the projection 180 d.

In the seventh embodiment, as shown in fig. 24 to 26, the base 1 has an inner cavity 17, a fifth insertion hole 18, and a second communication hole 19, the fifth insertion hole 18 and the second communication hole 19 each communicating with the inner cavity 17, at least part of the driving force receiving member being accommodated in the inner cavity 17, part of the driving force receiving member protruding out of the inner cavity 17 through the second communication hole 19, the fifth insertion hole 18 being for engagement with the positioning boss 180 i; a driving portion is also provided in the inner cavity 17, and is capable of driving the driving force receiving member to move in the axial direction of the base 1.

Specifically, the driving force receiving member includes: the first receiving rod 41 and the fourth main body part 42, the fourth main body part 42 is accommodated in the inner cavity 17, the first receiving rod 41 passes through the second communication hole 19 and extends out of the inner cavity 17, the driving part is a fifth elastic piece 21, one end of the fifth elastic piece 21 is abutted with the bottom wall of the inner cavity 17, and the other end is sheathed on the fourth main body part 42 and is abutted with the fourth main body part 42. Accordingly, the first receiving rod 41 can be maintained in a state of protruding out of the second communication hole 19 by the fifth elastic member 21, and can be moved in the axial direction against the elastic force of the fifth elastic member 21 when a certain external force is applied. Wherein the fifth elastic member 21 may be a spring.

More specifically, as shown in fig. 24, the first receiving lever 41 includes a drop-off prevention portion 41a and a receiving portion 41b, and the drop-off prevention portion 41a is located outside the receiving portion 41b in the radial direction of the base 1. The drop-off prevention portion 41a is formed in a long rod hook shape, and can be hooked with the hooking block 180h, so that the first receiving rod 41 and the driving force transmission member 180 are stably engaged. The receiving portion 41b is provided with a receiving surface that can abut against the link 180e to receive the driving force.

The driving force transmission process is as follows: when the process cartridge 100 is mounted to the main assembly 170 of the image forming apparatus M, the driving force transmitting member 180 protrudes in the direction M1B, and the driving force receiving member abuts against the first engaging member 204, so that the first engaging member 204 rotates in the reverse direction of the rotation direction of the driving force receiving member, and further, the first engaging member 204 and the second engaging member 208 are moved away from the connecting frame 180e. At this time, the driving force transmitting member 180 is still moving in the direction of M1B, and the receiving portion 41B abuts against the link frame 180e, so that the driving force transmitting member 180 transmits driving force to the coupling through the link frame 180e, thereby driving the rotation of the photosensitive drum 104.

Meanwhile, the hook-shaped end part of the anti-falling part 41a moves to the lower part of the clamping block 180h, the anti-falling part 41a is in contact with the lower surface of the clamping block 180h and the surface of the clamping block 180h facing the positioning boss 180i, so that the anti-falling part 41a is hooked with the clamping block 180h, the driving force transmission member 180 and the driving force receiving member are more stably connected, the driving force transmission member 180 and the driving force receiving member are not easy to fall off relatively, and the driving force transmission is more stable.

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 drum unit characterized by comprising a photosensitive drum (104) and a coupling provided at an end of the photosensitive drum (104) for engagement with a driving force transmitting member (180) of an image forming apparatus;

the coupling includes:

a driving force receiving member engageable with a connecting frame (180 e) and/or a positioning boss (180 i) of the driving force transmitting member (180) to receive a driving force from the driving force transmitting member (180);

and a base (1), wherein the driving force receiving member is arranged on the base (1), and the base (1) is connected with the photosensitive drum (104).

2. Drum unit according to claim 1, wherein the driving force receiving member is a rotation unit (9), the rotation unit (9) being provided with an insertion hole;

when the positioning boss (180 i) rotates, the rotating unit (9) locks the positioning boss (180 i) inserted into the insertion hole; when the positioning boss (180 i) stops rotating, the rotating unit (9) unlocks the positioning boss (180 i) inserted into the insertion hole.

3. Drum unit according to claim 2, characterized in that the rotating unit (9) comprises a connecting body (91) and a roller (92), the connecting body (91) being provided with a first insertion hole (913) and a plurality of rolling pockets (911), the positioning boss (180 i) being insertable into the first insertion hole (913), the roller (92) being rollable in the rolling pockets (911);

the rolling hole (911) is provided with a first rolling groove (911 a) and a second rolling groove (911 b), when the rolling shaft (92) rolls from the first rolling groove (911 a) to the second rolling groove (911 b), the rotating unit (9) locks the positioning boss (180 i), and when the rolling shaft (92) rolls from the second rolling groove (911 b) to the first rolling groove (911 a), the rotating unit (9) unlocks the positioning boss (180 i);

a reset part (912) is further arranged in the rolling hole (911), and the reset part (912) can drive the rolling shaft (92) to roll from the second rolling groove (911 b) to the first rolling groove (911 a).

4. A drum unit according to claim 3, wherein the first rolling groove (911 a) has an axis at a distance from the axis of the connecting body (91) greater than the second rolling groove (911 b) in the radial direction of the connecting body (91).

5. Drum unit according to claim 2, characterized in that the rotating unit (9) comprises at least two rotating blocks (94), the rotating blocks (94) being in rotational connection with the base (1), the rotating blocks (94) and the base (1) having a second insertion hole (94 a) therebetween, the rotating blocks (94) being rotatable to lock or unlock the positioning boss (180 i) inserted into the second insertion hole (94 a).

6. Drum unit according to claim 5, wherein the base (1) is provided with a mounting hole (13), the rotating block (94) comprises a rotating projection (941) and a connecting post (942), the connecting post (942) is eccentrically arranged on the rotating projection (941), and the connecting post (942) is clamped with the mounting hole (13).

7. Drum unit according to claim 6, wherein the rotation projection (941) has a first arc surface (941 a), and the second insertion hole (94 a) is formed between adjacent ones of the first arc surfaces (941 a).

8. Drum unit according to claim 6, characterized in that the base (1) is further provided with a guide block (14), the guide block (14) guiding the rotation of the rotating projection (941);

a first annular groove (16) is arranged between the guide block (14) and the base (1), and the first annular groove (16) is used for being matched with the driving force transmission component (180).

9. Drum unit according to any one of claims 2-8, characterized in that a thickening (12) is provided on the base (1), the thickening (12) being adapted to abut against a first engagement member (204) and/or a second engagement member (208) of the imaging device for driving the first engagement member (204) and/or the second engagement member (208) to move relative to the positioning boss (180 i).

10. Drum unit according to claim 1, wherein the driving force receiving member comprises a first guide portion (81) for guiding movement of a second engagement member (208) of the image forming apparatus, and a second guide portion (82) for guiding movement of a first engagement member (204) of the image forming apparatus;

a clamping groove (83) is formed between the first guide part (81) and the second guide part (82), and the clamping groove (83) is used for accommodating the connecting frame (180 e).

11. A drum unit according to claim 1, wherein said driving force receiving member includes a cylindrical portion (71) and an engaging portion (72) provided on an outer peripheral wall of said cylindrical portion (71), said cylindrical portion (71) being provided with an insertion hole;

the insertion hole is configured to be engaged with the positioning boss (180 i), and the engagement portion (72) is configured to abut against the connection frame (180 e) to receive a driving force from the connection frame (180 e).

12. Drum unit according to claim 11, wherein a fixing portion (73) is further provided on an outer peripheral wall of the cylindrical portion (71), the fixing portion (73) being adapted to be engaged with a second engagement member (208) of the image forming apparatus to guide movement of the second engagement member (208).

13. Drum unit according to claim 11, wherein the base (1) is provided with a mounting groove (11), wherein a first support portion (11 a) and a second support portion (11 b) are provided in the mounting groove (11), and wherein the second support portion (11 b) has a height higher than the first support portion (11 a) in the axial direction of the base (1);

at least part of the driving force receiving member is mounted in the mounting groove (11), the driving force receiving member further comprises a second main body part (74) connected with the cylindrical part (71), a supporting rod (75) is arranged on the second main body part (74), and the supporting rod (75) can be abutted with the side wall of the second supporting part (11 b) higher than the side wall of the first supporting part (11 a).

14. Drum unit according to claim 13, wherein the first support portion (11 a) encloses at least part of the second annular groove (11 c), the driving force receiving member further comprises a third elastic member (76) sleeved on the second main body portion (74), one end of the third elastic member (76) is abutted against the second main body portion (74), and the other end thereof extends into the second annular groove (11 c) to be abutted against the bottom wall of the second annular groove (11 c).

15. Drum unit according to claim 1, wherein the base (1) is provided with a mounting groove (11), the driving force receiving member comprising:

the clamping rod (61), the clamping rod (61) is connected to the base (1), and the clamping rod (61) is used for being clamped with the connecting frame (180 e);

a moving part (62), at least part of the moving part (62) is accommodated in the mounting groove (11), the moving part (62) is provided with a fourth insertion hole (62 a) and a avoiding groove (62 e), the clamping rod (61) passes through the avoiding groove (62 e), and the fourth insertion hole (62 a) is used for being matched with the positioning boss (180 i);

and a fourth elastic member (63), wherein one end of the fourth elastic member (63) is in contact with the moving part (62), and the other end is in contact with the bottom wall of the mounting groove (11).

16. Drum unit according to claim 15, characterized in that the clamping bar (61) is provided with a notch (61 a), the clamping bar (61) being clamped with the connecting frame (180 e) through the notch (61 a).

17. Drum unit according to claim 15, wherein the moving part (62) has a connecting rod (62 b), the fourth elastic member (63) being fitted around the connecting rod (62 b), the connecting rod (62 b) being located in the mounting groove (11) and protruding out of the mounting groove (11) through a through hole in the bottom of the mounting groove (11);

The driving force receiving member further includes a stopper (64), and a portion of the connecting rod (62 b) protruding from the mounting groove (11) is connected to the stopper (64).

18. Drum unit according to claim 15, wherein a guide block (62 c) and a pressing block (62 d) are provided on an outer peripheral wall of the moving portion (62), the guide block (62 c) being for guiding movement of a second engagement member (208) of the image forming apparatus, the pressing block (62 d) being for receiving a pressing force of the second engagement member (208).

19. Drum unit according to claim 1, characterized in that the base (1) has an inner cavity (17), a fifth insertion hole (18) and a second communication hole (19), both the fifth insertion hole (18) and the second communication hole (19) being in communication with the inner cavity (17), at least part of the driving force receiving member being accommodated in the inner cavity (17), part of the driving force receiving member protruding out of the inner cavity (17) through the second communication hole (19), the fifth insertion hole (18) being intended to cooperate with the positioning boss (180 i);

the inner cavity (17) is also provided with a driving part which can drive the driving force receiving component to move along the axial direction of the base (1).

20. The drum unit according to claim 19, wherein the driving force receiving member includes: a first receiving rod (41) and a fourth main body portion (42), the fourth main body portion (42) being accommodated in the inner cavity (17), the first receiving rod (41) protruding out of the inner cavity (17) through the second communication hole (19);

the driving part is a fifth elastic piece (21), one end of the fifth elastic piece (21) is in contact with the bottom wall of the inner cavity (17), and the other end of the fifth elastic piece is sleeved on the fourth main body part (42) and is in contact with the fourth main body part (42).

21. Drum unit according to claim 20, wherein the first receiving lever (41) comprises a drop-off prevention portion (41 a) and a receiving portion (41 b), the drop-off prevention portion (41 a) being located outside the receiving portion (41 b) in the radial direction of the base (1), the drop-off prevention portion (41 a) being for connection with a snap-on block (180 h) on the driving force transmitting member (180), the receiving portion (41 b) being for connection with a connecting frame (180 e).

22. A process cartridge, comprising the drum unit according to any one of claims 1 to 21.