CN214122687U - Developing cartridge and process cartridge - Google Patents

Abstract

The application relates to the technical field of laser printing equipment, and provides a developing box and a processing box, wherein the developing box comprises a developing roller and a forced pushing mechanism, and the forced pushing mechanism is arranged on the box wall of the developing box and comprises an elastic member and a movable member; one end of the elastic element is connected with the limiting element on the box wall, and the other end of the elastic element is connected with the movable element; the processing box comprises a developing box and a drum component, when the developing box is arranged on the drum component, the moving part can push the drum component under the action of the elastic force of the elastic part, so that the developing roller can be in close contact with the photosensitive drum in the drum component. This developing box and processing box can utilize the elasticity of forcing the elastic component in pushing away the mechanism to compel to push away developing box, when having guaranteed developing roller and sensitization drum in close contact with, can also avoid forcing the portion of receiving in pushing away the mechanism or the drum subassembly to install wearing and tearing.

Description

Developing cartridge and process cartridge

The present application claims priority from the chinese patent application entitled "developing cartridge" filed by the chinese patent office at 03/06/2020 and having application number 202020272293.X, the entire contents of which are incorporated herein by reference.

Technical Field

The application relates to the technical field of laser printing equipment, in particular to a developing box and a processing box.

Background

A process cartridge is a relatively common important component of a laser printing apparatus, and mainly includes a drum assembly having a photosensitive drum therein and a developing cartridge detachably mounted to the drum assembly, wherein the developing cartridge has a developing roller therein, and in order for the process cartridge to normally perform a printing function, the photosensitive drum must be brought into close contact with the developing roller when the developing cartridge is mounted to the drum assembly.

The process cartridge in the prior art is generally fixedly provided with a forced pushing member on the developing cartridge, the forced pushing member is generally a protruding part positioned on the cartridge wall of the developing cartridge, and when the developing cartridge is mounted on a drum assembly, the forced pushing member correspondingly extrudes the drum assembly, so that a developing roller in the developing cartridge can be in close contact with a photosensitive drum in the process cartridge.

However, since the developing cartridge is detachably mounted in the process cartridge, when the developing cartridge is mounted and dismounted a certain number of times, the urging member in the developing cartridge or the pressed portion in the drum assembly is easily worn, which affects the contact tightness between the photosensitive drum and the developing roller.

SUMMERY OF THE UTILITY MODEL

In view of this, the present application provides a developing cartridge and a processing cartridge, so as to solve the problem that in the prior art, when the developing cartridge is disassembled and assembled for a certain number of times, the forced pushing member is easily worn and the contact tightness between the photosensitive drum and the developing roller is affected.

The developing box comprises a box body, a developing roller and a forced pushing mechanism;

the cartridge body is used for accommodating a developer;

the developing roller is rotatably supported on the cartridge body;

the forced pushing mechanism is arranged on the box wall of the box body and comprises an elastic piece and a movable piece;

one end of the elastic element is connected with the limiting element on the box wall, and the other end of the elastic element is connected with the movable element;

when the developing box is installed on the drum component, the moving part can push the drum component under the action of the elastic force of the elastic part, so that the developing roller can be in close contact with the photosensitive drum in the drum component.

When the developing box is installed, the developing box can be pushed into the drum component through external force, the developing box can be correspondingly installed in the drum component, the moving part is extruded and moved towards the elastic part by the stress part of the drum component, so that the elastic part generates elastic contraction and stores elastic potential energy, the moving part extrudes the pressed part in the drum component, and the developing roller in the developing box can be in close contact with the photosensitive drum in the processing box under the elastic action of the elastic part.

Compare with the mounting means of the developing cartridge among the prior art, the developing cartridge that this application embodiment provided can utilize the elasticity of elastic component to compel to push away the developing cartridge, when having guaranteed developing roller and sensitization drum in the processing box in close contact with, can also avoid compelling the installation wearing and tearing of the portion of bearing in pushing away the mechanism or the drum subassembly.

In a possible design, the urging mechanism further comprises a limiting member for mounting the movable member;

the limiting piece is fixedly arranged on the box wall of the box body and provided with a limiting part;

one end of the elastic element is connected with the limiting element, and the other end of the elastic element is connected with the movable element;

the movable piece is provided with a matching part and is movably connected with the limiting part through the matching part;

the movable piece can move back and forth along the limiting piece, and the limiting portion can limit the moving range of the movable piece.

Through setting up the locating part, can avoid the unordered motion of moving part, ensure when the developing cartridge is installed in the drum subassembly, the moving part can correspond the pressure portion of butt drum subassembly.

In a possible design, the limiting part is a limiting groove formed in the limiting part;

the matching part is a clamping head arranged on the movable part;

the clamping head is movably inserted into the limiting groove and can be clamped with the groove end of the limiting groove in a barb clamping and locking manner.

Like this when the moving part is installed in the locating part, dop alright activity is pegged graft in the spacing groove to can be through the mode of barb kayser and the groove end joint of spacing groove, so can realize the function of injecing moving part direction of motion and movement distance, have simple structure, simple to operate's advantage.

In one possible design, the limiting part is a limiting screw arranged on the limiting part;

the matching part is a waist-shaped hole provided with the movable piece;

the limiting screw penetrates through the waist-shaped hole, and the moving part can move relative to the box body along the length direction of the waist-shaped hole.

Like this when the moving part is installed in the locating part, stop screw can wear to adorn in waist shape hole, just the moving part can be relative along the length direction in waist shape hole the box body removes, so can realize the function of injecing moving part direction of motion and movement distance, has simple structure, simple to operate's advantage equally.

In one possible design, the stop element is further provided with a guide rail;

the movable piece is provided with a guide part corresponding to the guide rail;

when the movable piece is installed on the limiting piece, the guide portion is correspondingly abutted to the guide rail and can reciprocate along the guide rail.

Therefore, the guide part is abutted against the guide rail, the moving direction of the moving part can be further limited, and the stability and the smoothness of the moving part during moving are fully ensured.

In one possible design, the drum assembly further comprises a presser;

the pressing member is mounted on the drum assembly and can lock and fix the movable member to the stopper.

Through setting up foretell pressing member, can be fixed with the moving part kayser after the installation of developing cartridge, avoid developing cartridge to cause wearing and tearing to the moving part at the installation in-process or dismantlement in-process, further improve the life of moving part.

In one possible design, the presser member is movably mounted to the drum assembly by a hinge shaft;

the pressing piece is provided with a pressing part and a locking part for hooking the movable piece;

when the pressing part is pressed, the pressing piece can rotate around the hinge shaft, so that the locking part locks or unlocks the movable piece.

Like this when can block lock or unblock the moving part through pressing the mode of portion rotation pressing piece, have simple structure, the convenient advantage of blocking lock unblock operation.

In one possible design, the elastic member is a tension spring or a compression spring;

one end of the elastic member is connected with a box wall of the developing box provided with the limiting member, and the other end of the elastic member is connected with one side of the movable member;

the moving piece is also provided with a pushing part for pushing.

Therefore, the urging extrusion of the movable part on the developing box can be realized through the tension of the tension spring or the thrust of the pressure spring, and the developing box has the advantages of simple structure and stable urging extrusion.

In one possible design, the developing cartridge has a first mounting cartridge wall and a second mounting cartridge wall perpendicular to an axial direction of the developing roller;

the forced pushing mechanism is arranged on each of the first installation box wall and the second installation box wall.

Two forced pushing mechanisms are used for respectively forcing two box walls of the developing box, so that both sides of the developing box can be stably installed in the drum assembly, and the developing roller can be further ensured to be in close contact with the photosensitive drum.

In addition, the application also provides a processing box, which comprises a drum component and the developing box, wherein the drum component is provided with a photosensitive drum;

the developing box is arranged in the drum component, the moving part can push the drum component under the action of the elastic force of the elastic part, so that the developing roller can be in close contact with the photosensitive drum.

The processing box comprises the developing box, can realize all the beneficial effects of the developing box, and is not described in detail herein.

Additional features and advantages of embodiments of the present application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of embodiments of the present application. The objectives and other advantages of the embodiments of the application will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

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

FIG. 2 is a schematic structural view of a drum assembly in a process cartridge according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a developing cartridge provided in an embodiment of the present application;

fig. 4 is a partial exploded view of a first structure of a developing cartridge provided in an embodiment of the present application;

FIG. 5 is a schematic view of the moveable member of FIG. 4 from another perspective;

FIG. 6 is a partial exploded view of a second construction of a developing cartridge according to an embodiment of the present application;

FIG. 7 is a schematic view of the moveable member of FIG. 6 from another perspective;

FIG. 8 is a schematic view showing a third structure of a developing cartridge according to an embodiment of the present application;

FIG. 9 is a partial exploded view of a third structure of a developing cartridge according to an embodiment of the present application

FIG. 10 is a schematic view of another perspective of the pressing member of FIG. 8;

FIG. 11 is a schematic view of the moveable member of FIG. 8 from another perspective;

fig. 12 is a schematic view of a fourth structure of the developing cartridge provided in the embodiment of the present application.

Reference numerals:

1-a drum assembly;

12-a press;

121-a pressing part;

122-a latch;

123-unlocking part;

13-first force-receiving part

14-second force-receiving part

2-a developing cartridge;

21-an elastic member;

22-a movable member;

221-a mating portion;

222-a guide;

223-a forced pushing part;

224-a connecting shaft;

225-fixed protrusions;

226-push protrusion;

23-a stop;

231-a limiting part;

232-a guide rail;

233-positioning columns;

234-a blocking portion;

24-a developer roller;

25-unlocking protrusion.

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

Detailed Description

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of 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 type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

It should be noted that the terms "upper", "lower", "left", "right", and the like used 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 addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.

Next, a specific embodiment of the structure of the developing cartridge according to the embodiment of the present application will be described.

As shown in fig. 1, 2 and 3, the present embodiment provides a developing cartridge 2 detachably mountable to a drum assembly 1; the drum assembly 1 has a photosensitive drum, a first force receiving portion 13, and a second force receiving portion 14; and the developing cartridge 2 has a cartridge body accommodating the developer, a developing roller 24, and an urging mechanism provided on a cartridge wall of the developing cartridge; wherein, the forced pushing mechanism comprises an elastic element 21 and a movable element 22; one end of the elastic element 21 is connected with the movable element 22; when the developing cartridge 2 is mounted to the drum assembly 1, the movable member 22 can urge the drum assembly 1 under the elastic force of the elastic member 21 so that the developing roller 24 can be brought into close contact with the photosensitive drum.

When the developing cartridge 2 is mounted, the developing cartridge is pushed into the drum assembly by an external force, so that the developing cartridge 2 can be correspondingly mounted in the drum assembly 1, the movable member 22 is extruded and moved towards the elastic member 21 by the stress part of the drum assembly in the process, the elastic member 21 generates elastic contraction and stores elastic potential energy, the movable member 22 is extruded to the pressed part in the drum assembly 1, and thus the developing roller 24 in the developing cartridge 2 can be kept in close contact with the photosensitive drum in the drum assembly 1 under the elastic force action of the elastic member 21.

Compare with the mounting means of the developing cartridge among the prior art, the developing cartridge that this application embodiment provided can utilize the elasticity of elastic component 21 to compel to push away the developing cartridge, when having guaranteed developing roller 24 and sensitization drum in the processing box in close contact with, can also avoid compelling the installation wearing and tearing of the portion of bearing in pushing away mechanism or the drum subassembly 1.

In an alternative of this embodiment, the urging mechanism further includes a stopper 23 for mounting the movable member 22; the limiting member 23 is fixedly disposed on the cartridge wall of the developing cartridge 2, and the limiting member 23 has a limiting portion 231; the movable piece 22 has a matching portion 221 and is movably connected with the limiting portion 231 through the matching portion 221; the movable member 22 can reciprocate along the limiting member 23, and the limiting portion 231 can limit the moving range of the movable member 22.

Specifically, as shown in fig. 2 and 4, by providing the limiting member 23 for installing the moving member 22, the limiting member 23 is separated from the box body, the limiting member 23 is fixed to two fixing posts on the box body by two screws passing through screw holes, the screw holes are respectively arranged on the two fixing posts, the two fixing posts are respectively arranged at two ends of the limiting member 23, and the limiting member 23 may also be integrally formed with the box body. The movable member 22 can reciprocate within a fixed range in the limiting member 23, so that when the elastic member 21 applies an elastic thrust force to the movable member 22 away from the elastic member 21 or the drum assembly 1 presses the movable member 22 to move toward the elastic member 21, the movable member 22 can only move a certain distance in a limited straight direction, thereby avoiding the irregular movement of the movable member 22, ensuring that when the developing cartridge 2 is mounted on the drum assembly 1, the movable member 22 can correspondingly abut against the first stressed portion 13 in the drum assembly 1, and is used for receiving the pressure from the first stressed portion 13 to force the movable member 22 to move toward the developing roller 24, thereby forming a force pressing the developing cartridge toward the photosensitive drum direction, and enabling the developing roller and the photosensitive drum to be in close contact.

In an alternative of this embodiment, the limiting part 231 is a limiting groove opened in the limiting part 23; the fitting portion 221 is a chuck provided in the movable member 22; the clamping head is movably inserted in the limiting groove and can be clamped with the groove end of the limiting groove in a barb clamping and locking manner.

Specifically, as shown in fig. 4 and 5, the limiting portion 231 is specifically set to be a limiting groove, the matching portion 221 is set to be a chuck, the limiting groove is set to be a rectangular through hole parallel to the limiting part, so when the moving part 22 is installed on the limiting part 23, one end of the elastic member is relatively fixed to the limiting part 23, the other end of the elastic member is relatively fixed to the connecting shaft 224 of the moving part 22, the chuck can be movably inserted into the limiting groove, the moving part 22 can move through the limiting groove, and can be clamped with the groove end of the limiting groove in the edge position of the moving range of the moving part in a manner of barb clamping lock, the elastic member can enable the moving part to move axially along the elastic member, the limiting groove can prevent the moving part 22 from being separated in the moving process, so that the function of limiting the moving direction and the moving distance of the moving part 22 can be realized, and the structure is simple and convenient to install.

Of course, the limiting grooves and the chucks may be correspondingly provided in multiple groups, and the shapes of the limiting grooves and the chucks may also be correspondingly provided in multiple shapes, so as to further ensure the limiting installation effect on the movable member 22.

In an alternative of this embodiment, the limiting part 231 is configured as a limiting screw to be fitted with a screw hole of the limiting column; the limiting column is positioned on the side wall of the box body, and the matching part 221 is a waist-shaped hole provided with the movable piece 22; the limit screw is inserted into the waist-shaped hole and the limit column, and the movable member 22 can move along the length direction of the waist-shaped hole relative to the box body.

Specifically, as shown in fig. 6 and 7, at this time, the limiting member 23 is set to be a limiting screw, and the matching portion 221 is set to be a waist-shaped hole, so that when the moving member 22 is installed on the limiting member 23, the limiting screw can be mounted in the waist-shaped hole in a penetrating manner, and the moving member 22 can move relative to the box body along the length direction of the waist-shaped hole, so that the function of limiting the moving direction and the moving distance of the moving member 22 can be realized, and the advantages of simple structure and convenience in installation are also achieved.

Similarly, the plurality of sets of limit screws and the plurality of waist-shaped holes may be arranged in a one-to-one correspondence to further ensure the limit installation effect on the movable member 22.

In an alternative of this embodiment, the limiting member 23 is further provided with a guide rail 232; the movable piece 22 is provided with a guide portion 222 corresponding to the guide rail 232; when the movable member 22 is mounted on the limiting member 23, the guide rail 232 on the box body is clamped between the guide portions 222 of the movable member, so as to guide the movable member 22 to move along the guide rail 232; the guide part 222 is correspondingly abutted with the guide rail 232 and can move back and forth along the guide rail 232; the guide rail 232 is located between the fixing post and the locking member, and the fitting portion 221 and the fixing post are connected together by screwing. The box body side wall is also provided with a second fixing column, and the fixing column is provided with a gasket screw which penetrates through the gasket and the fixing column to be fixedly connected with the gasket and the fixing column, so that the limiting effect on the moving part 22 is achieved, and the moving part 22 is prevented from tilting. One end of the elastic element is fixed relative to the third fixed column, and the other end is fixed relative to the connecting shaft 224 on the movable element, and the elastic element can make the movable element 22 move along the axial direction of the elastic element.

Specifically, as shown in fig. 2, 6 and 7, the guide rail 232 is disposed in the stopper 23, the guide portion 222 is correspondingly disposed in the movable element 22, and when the movable element 22 is mounted on the stopper 23, the guide portion 222 is correspondingly abutted against the guide rail 232 and can be attached to and reciprocated along the guide rail 232. By the guide portion 222 abutting against the guide rail 232 in this way, the moving direction of the movable element 22 can be further restricted, and the stability and smoothness of the movement of the movable element 22 can be sufficiently ensured. The movable member 22 is adapted to receive the pressure from the second force receiving portion 14. Stability of the moveable member 22 during movement may be maintained during assembly of the moveable member 22.

When the developing cartridge is mounted in the drum assembly, the urging portion 223 contacts the second force-receiving portion 14 on the drum assembly, and the urging mechanism receives the pressure of the second force-receiving portion 14 to urge the movable member 22 toward the developing roller 24, thereby forming urging between the developing cartridge 2 and the photosensitive drum, so that the developing roller 24 and the photosensitive drum can be in close contact.

In an alternative of the present embodiment, the drum assembly 1 further includes a pressing member 12; the pressing member 12 is attached to the drum assembly 1 and can lock and fix the movable member 22 to the stopper member 23. The movable member 22 further has a connecting shaft 224, a fixing projection 225 and a urging projection 226.

Specifically, as shown in fig. 8 to 11, the pressing member 12 is provided, and the movable member 22 can be temporarily locked and fixed to the stopper 23 by the pressing member 12. When the powder box is not installed in the drum assembly, the pressing part 121 of the pressing part 12 is pressed down, the rotary pressing part 12 is in an unlocking state, the developing box is installed in the drum assembly at the moment, the pressing part 121 is loosened, the locking part 122 rotates along with the rotating shaft, so that the clamping part is contacted with the forced pushing protrusion 226 on the moving part, the developing box is locked, and the moving part 22 can forcedly push the developing box 2 under the action of the elastic force of the elastic part 21; and after the developer in the developing cartridge is consumed, when the developing cartridge 2 needs to be disassembled, the pressing part 121 is pressed, the unlocking part 123 contacts the unlocking protrusion 25 on the cartridge body, so that the developing cartridge 2 receives an upward acting force, the developing cartridge 2 moves upwards, and is separated from the drum assembly 1, therefore, when the developing cartridge 2 is disassembled, on one hand, the developing cartridge can be more convenient and labor-saving, and on the other hand, the movable part 22 can be prevented from being worn.

Through setting up foretell pressing member 12, can fix moving part 22 kayser after developing cartridge 2 installation advances drum assembly 1, avoid developing cartridge 2 installation process or dismantlement in-process to cause wearing and tearing to moving part 22, further improve moving part 22's life.

In an alternative of the present embodiment, the pressing member 12 is movably mounted to the drum assembly 1 by a hinge shaft; the pressing member 12 has a pressing portion 121 and a latching portion 122 for hooking the movable member 22; when the pressing portion 121 is pressed, the pressing member 12 can rotate around the hinge shaft to lock or unlock the movable member 22 by the locking portion 122.

Specifically, as shown in fig. 8 to 10, the pressing member 12 is movably mounted to the drum assembly 1 through a rotating shaft, and when the pressing portion 121 of the pressing member 12 is pressed, the pressing member 12 can rotate around the rotating shaft, and the locking portion 122 locks or unlocks the movable member 22.

The specific arrangement mode of the pressing piece 12 has the advantages of simple structure and convenience in locking and unlocking operation.

In an alternative of this embodiment, the elastic member 21 is a tension spring; one end of the tension spring is connected with the positioning column 233 of the limiting piece 23, and the other end of the tension spring is connected with the connecting shaft 224 of the movable piece 22; the movable piece 22 is also provided with an urging portion 223 for urging.

Specifically, as shown in fig. 8 to 11, the elastic member 21 is specifically provided as a tension spring, and the engagement portion 221 of the movable member 22 is provided as two kidney-shaped holes. The two slotted holes are engaged with the two fixed posts, so that the movable member 22 is mounted on the case. The elastic member 21 is arranged to enable the movable member 22 to move along the guide rail of the limiting member 23 after being stressed, or to recover to the initial position after the acting force of the movable member 22 disappears, so that the tension spring can provide a pulling force towards the elastic member 21 to the movable member 22 all the time, the movable member 22 can push and extrude the developing box 2 by the pulling force of the tension spring, and the movable member 22 forms pushing and extruding of the box body by acting with the pressing member 12.

In an alternative of this embodiment, the elastic member 21 is a compression spring; one end of the pressure spring is abutted against a blocking part 234 integrally formed with the two fixed columns, and the other end of the pressure spring is connected with a fixed protrusion 225 on one side of the movable piece 22; the movable piece 22 is further provided with an urging portion 223 for urging, and one side of the urging portion 223 departing from the pressure spring is an urging surface.

Specifically, as shown in fig. 12, at this moment, the elastic member 21 is specifically set to be a pressure spring, so the pressure spring can provide a thrust that deviates from the elastic member 21 to the moving member 22 all the time, at this moment, one side of the deviation of the tension spring of the urging portion 223 in the moving member 22 is set to be an urging surface, so the urging extrusion of the moving member 22 to the box body can be realized by the thrust of the pressure spring, the moving member 22 acts on the urging extrusion of the box body through the pressing member 12, and the advantages of simple structure and stable urging extrusion are also achieved.

In an alternative of the present embodiment, the developing cartridge 2 has a first mounting cartridge wall and a second mounting cartridge wall perpendicular to the axial direction of the developing roller 24; the forced pushing mechanisms are respectively arranged on the first mounting box wall and the second mounting box wall.

Two box walls which are vertical to the axial direction of the developing box 2 and the developing roller 24 are respectively used as a first mounting box wall and a second mounting box wall, and the urging mechanisms are respectively arranged on the first mounting box wall and the second mounting box wall, so that the two box walls of the developing box 2 are respectively urged by the two urging mechanisms, both ends of the developing box 2 can be stably mounted in the drum assembly 1, and the developing roller 24 is further ensured to be in close contact with the photosensitive drum.

In addition, the embodiment of the application also provides a processing box, the processing box comprises a drum component 1 and the developing box, and the drum component 1 is provided with a photosensitive drum; when the developing cartridge is mounted on the drum assembly 1, the movable member 22 can urge the drum assembly 1 under the elastic force of the elastic member 21 so that the developing roller 24 can be brought into close contact with the photosensitive drum.

The processing box comprises the developing box, can realize all the beneficial effects of the developing box, and is not described in detail herein.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (10)

1. A developing cartridge, characterized by comprising:

a cartridge for containing a developer;

a developing roller (24) rotatably supported on the cartridge body;

the forced pushing mechanism is arranged on the box wall of the box body and comprises an elastic piece (21) and a movable piece (22);

when the developing box is installed on the drum component (1), the moving part (22) can push the drum component (1) under the action of the elastic force of the elastic part (21), so that the developing roller (24) can be in close contact with the photosensitive drum in the drum component.

2. A developing cartridge according to claim 1, wherein said urging mechanism further includes a stopper (23) for mounting said movable member (22);

the limiting piece (23) is fixedly arranged on the box wall of the box body, and the limiting piece (23) is provided with a limiting part (231);

the movable piece (22) is provided with a matching part (221) and is movably connected with the limiting part (231) through the matching part (221);

one end of the elastic element (21) is connected with the limiting element, and the other end of the elastic element is connected with the movable element (22);

the movable piece (22) can move back and forth along the limiting piece (23), and the limiting portion (231) can limit the moving range of the movable piece (22).

3. A developing cartridge according to claim 2, wherein said position-limiting portion (231) is a position-limiting groove opened to said position-limiting member (23);

the matching part (221) is a clamping head arranged on the movable piece (22);

the clamping head is movably inserted into the limiting groove and can be clamped with the groove end of the limiting groove in a barb clamping and locking manner.

4. A developing cartridge according to claim 2, wherein said position restricting portion (231) is a position restricting screw provided to said position restricting member (23);

the matching part (221) is a waist-shaped hole arranged on the movable piece (22);

the limiting screw penetrates through the waist-shaped hole, and the moving piece (22) can move relative to the box body along the length direction of the waist-shaped hole.

5. Developing cartridge according to claim 4, wherein the retaining member (23) is further provided with a guide rail (232);

the movable piece (22) is provided with a guide part (222) corresponding to the guide rail (232);

when the movable member (22) is mounted on the stopper member (23), the guide portion (222) is in contact with the guide rail (232) and can reciprocate along the guide rail (232).

6. A developing cartridge according to claim 4, wherein said drum assembly (1) further comprises a pressing member (12);

the pressing piece (12) is mounted on the drum component (1) and can lock and fix the movable piece (22) on the limiting piece (23).

7. A developing cartridge according to claim 6, wherein said pressing member (12) is movably mounted to said drum assembly (1) by a hinge shaft;

the pressing piece (12) is provided with a pressing part (121) and a locking part (122) for hooking the movable piece (22);

when the pressing part (121) is pressed, the pressing piece (12) can rotate around the hinge shaft, so that the locking part (122) locks or unlocks the movable piece (22).

8. A developing cartridge according to any one of claims 2 to 7, wherein said elastic member (21) is a tension spring or a compression spring;

one end of the elastic member (21) is connected with the limiting member (23), and the other end of the elastic member is connected with one side of the movable member (22);

the movable piece (22) is also provided with an urging part (223) for urging.

9. A developing cartridge according to any one of claims 1 to 7, wherein said cartridge body has a first mounting cartridge wall and a second mounting cartridge wall perpendicular to an axial direction of said developing roller (24);

the forced pushing mechanism is arranged on each of the first installation box wall and the second installation box wall.

10. A process cartridge characterized by comprising a drum assembly (1) and the developing cartridge according to any one of claims 1 to 9, and said drum assembly (1) has a photosensitive drum;

the developing box is arranged in the drum component (1), the moving part (22) can push the drum component (1) under the action of the elastic force of the elastic part (21), so that the developing roller (24) can be in close contact with the photosensitive drum.

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