CN220121151U

CN220121151U - Developing device and drum assembly

Info

Publication number: CN220121151U
Application number: CN202320589230.0U
Authority: CN
Inventors: 彭天生; 曾丽坤; 梁晓明; 周寂鸣; 程晨; 王常彪; 邝雷志; 张为志
Original assignee: Zhuhai Nastar Information Technology Co ltd
Current assignee: Zhuhai Nastar Information Technology Co ltd
Priority date: 2022-04-07
Filing date: 2023-03-22
Publication date: 2023-12-01
Anticipated expiration: 2033-03-22

Abstract

The utility model discloses a developing device, comprising: the box body is provided with a first end and a second end in a first direction, a third end and a fourth end in a second direction, and a powder outlet is formed in the third end; the first end and/or the second end of the box body is provided with a protecting cover; the developing assembly comprises a developing roller and a stirring frame, the developing roller is rotatably supported at the powder outlet, and the stirring frame is rotatably supported in the accommodating cavity; the developing roller and the stirring frame extend along a first direction; in the second direction, the area between the developing roller and the stirring frame is a first area; the pushed component is arranged at the first end, the second end and/or the protecting cover of the box body and is used for receiving the pushing force of the pushing component so as to enable the developing roller to be in close contact with the photosensitive drum; in the second direction, the pushed assembly is located outside the first region. The developing device adopting the scheme of the utility model receives the forced thrust of the drum assembly through the pushed assembly when in operation, so that the developing roller is in close contact with the photosensitive drum, and the imaging quality is ensured.

Description

Developing device and drum assembly

Technical Field

The present utility model relates to the field of image forming apparatuses, and more particularly, to a developing apparatus and a drum assembly.

Background

The developing device is a detachable portion widely used in image forming apparatuses, and is mountable on a drum assembly to be mounted to the image forming apparatus together with the drum assembly. In the development process of the image forming apparatus, the developing roller of the developing apparatus needs to be in close contact with the photosensitive drum on the drum assembly so that the photosensitive drum can better receive the developer on the developing roller, thereby ensuring the printing quality of the image forming apparatus. In order to enable the developing roller to be in close contact with the photosensitive drum, a pushing member is generally arranged on the developing device to receive the pushing force exerted by the drum assembly, so as to ensure the close contact between the developing device and the photosensitive drum.

Disclosure of Invention

According to an aspect of the present utility model, there is provided a developing device detachably mountable to an image forming apparatus including a drum assembly including a photosensitive drum and a urging assembly; the developing device includes:

the box body is internally provided with a containing cavity for containing developer, the box body is provided with a first end and a second end in a first direction, a third end and a fourth end in a second direction, and a powder outlet is arranged at the third end; the first end and/or the second end of the box body is/are provided with a protecting cover;

A developing assembly including a developing roller rotatably supported at the powder outlet and a stirring frame rotatably supported within the accommodating chamber; the developing roller and the stirring frame extend along a first direction; in the second direction, the area between the developing roller and the stirring frame is a first area;

the pushed component is arranged at the first end, the second end and/or the protecting cover of the box body and is used for receiving the pushing force of the pushing component so as to enable the developing roller to be in close contact with the photosensitive drum;

in a second direction, the pushed assembly is located outside the first region.

In some embodiments, the first end is provided with a first recess having intersecting first and second surfaces, the first surface being orthogonal to the first direction, the second surface being parallel to the first direction;

the second end is provided with a second concave part, the second concave part is provided with a third surface and a fourth surface which are intersected, the third surface is orthogonal to the first direction, and the fourth surface is parallel to the first direction;

the pushed component comprises a pushed piece, the pushed piece protrudes out of the first surface and the third surface, a space is reserved between the pushed piece and the second surface and between the pushed piece and the fourth surface, and the pushed piece is used for receiving the pushing force of the pushing component.

In some embodiments, the pushed assembly includes a pushed member disposed on the protective cover, and further includes a support member for supporting the pushed member, the support member being disposed on the case and inside the pushed member.

In some embodiments, the pushed assembly includes a second pushed member disposed at the second end, and the developing device includes a second mounting portion for mounting the second pushed member, the second pushed member being movably disposed at the second mounting portion;

the pushed assembly further includes a second elastic member defined between the second pushed member and the second mounting portion, the second elastic member being compressed when the second pushed member receives the pushing force movement of the pushing assembly.

In some embodiments, the projection of the second pushed member in the first direction is at least partially outside the projection of the cartridge body in the first direction.

In some embodiments, the cartridge has fifth and sixth opposite ends in a third direction intersecting the first and second directions;

the second pushed piece at least partially protrudes from the sixth end.

In some embodiments, the pushed assembly includes a first pushed member disposed at the first end, the first pushed member being closer to the fifth end than the second pushed member in the third direction.

In some embodiments, one of the second pushed piece and the second mounting portion is provided with a second sliding groove, and the other is provided with a second guiding convex portion matched with the second sliding groove.

In some embodiments, the pushed assemblies are respectively disposed at two ends of the developing device in the first direction, and the pushed assemblies at the two ends are aligned or not aligned in the first direction.

According to an aspect of the present utility model, there is provided another developing device detachably mountable to an image forming apparatus including a drum assembly including a photosensitive drum, a drum frame, and a urging assembly; the developing device includes:

a developing assembly including a developing roller rotatably supported at the powder outlet and a stirring frame rotatably supported within the accommodating chamber; the developing roller and the stirring frame extend along a first direction;

the pushed assembly is in contact with the drum frame for guiding the mounting of the developing device.

In some embodiments, the pushed assembly includes a guide protrusion protruding from an outer surface of the case or an outer surface of the cover in a first direction.

In some embodiments, the projection of the pushed assembly in the first direction at least partially coincides with the projection of the developer roller in the first direction.

According to another aspect of the present utility model, there is provided a drum assembly comprising a photosensitive drum, a drum frame to which a developing device as described above is mounted, and a urging assembly;

the drum frame is provided with side walls which are oppositely arranged in a first direction, and a bottom wall connected with the side walls is arranged on the drum frame in a third direction;

the photosensitive drum is arranged on the front side of the drum frame in the second direction;

the pushing component is used for applying a pushing force towards the direction of the photosensitive drum to the pushed component of the developing device;

the side wall is provided with a first guide surface, and the front end of the first guide surface in the second direction is lower than the rear end of the first guide surface in the second direction;

At least a portion of the urging assembly is located within the range of the first guide surface in the second direction during mounting of the developing device to the drum assembly.

In some embodiments, the first guide surface is provided with a limit groove on a front side in the second direction, the limit groove is opened at a rear end in the second direction, and the limit groove limits movement of the pushed assembly forward in the third direction and in the second direction after the pushed assembly moves along the first guide surface from the opening into the limit groove.

In some embodiments, the urging assembly includes an urging member and a third elastic member defined between the urging member and the drum frame, the third elastic member exerting a force on the urging member in a second direction toward the photosensitive drum;

the front end of the forcing pushing piece in the second direction at least partially shields the opening of the limiting groove.

In some embodiments, the front end of the forcing member in the second direction is provided with a guide portion protruding upward, and the guide portion is located between the first guide surface and the limit groove in the second direction;

the guide part comprises a second guide surface and a third guide surface which are connected;

A front end of the second guide surface in the second direction is connected with a rear end of the third guide surface in the second direction;

the position of the rear end of the second guide surface in the second direction is lower than the position of the front end of the second guide surface in the second direction;

the position of the front end of the third guide surface in the second direction is lower than the position of the rear end thereof in the second direction.

The utility model has the beneficial effects that: the developing device adopting the scheme of the utility model receives the forced thrust of the drum assembly through the pushed assembly when in operation, so that the developing roller is in close contact with the photosensitive drum, and the imaging quality is ensured.

Drawings

FIG. 1 is a front view of a developing device in accordance with a first embodiment;

fig. 2 is a schematic perspective view of a developing device according to the first embodiment;

FIG. 3 is a schematic view of a part of the first end of the first housing with the first cover removed in accordance with the first embodiment;

FIG. 4 is a schematic view showing a partial structure of a second end of the case in the first embodiment;

FIG. 5 is a schematic structural view of a pushed component of the first end of the case in the first embodiment;

FIG. 6 is a schematic structural view of a pushed component of the second end of the case in the first embodiment;

FIG. 7 is a schematic diagram of a pushed assembly in a second embodiment;

FIG. 8 is a schematic view of the second embodiment with the first cover removed and the rear support removed at an angle;

FIG. 9 is a schematic view of the second embodiment with the first cover removed and the rear support removed at an alternative angle;

FIG. 10 is a schematic view illustrating an angle of the first protective cover according to the second embodiment;

FIG. 11 is a schematic view of a first protective cover according to another embodiment;

FIG. 12 is a schematic view showing a structure in which a rear supporting portion of the second cover is removed in a modification of the second embodiment;

FIG. 13 is a schematic view showing a structure in which a developing device is mounted to an existing drum assembly in the third embodiment;

FIG. 14 is a schematic structural view of a prior art drum assembly;

fig. 15 is a schematic structural view of a developing device in the third embodiment;

FIG. 16 is a schematic view showing the structure of a first end of a case in the third embodiment;

FIG. 17 is a schematic view of the third embodiment with the first end of the housing removed;

FIG. 18 is a schematic view of a protective cover in a third embodiment;

FIG. 19 is a schematic view showing the structure of a pushing member in the third embodiment;

fig. 20 is a partially exploded view of a developing device in the third embodiment;

fig. 21 is a schematic structural view of a second mounting portion in the third embodiment;

FIG. 22 is a schematic view showing the structure of the second end of the third embodiment;

FIG. 23 is a cross-sectional view of a first end of the cartridge of the third embodiment;

FIG. 24 is a cross-sectional view of the developing device mounted to the drum assembly in the third embodiment;

FIG. 25 is a schematic view showing the structure of a first end of a case in the fourth embodiment;

FIG. 26 is a schematic view showing the structure of the second end of the case in the fourth embodiment;

FIG. 27 is a schematic view showing a partial structure of a developing device according to the fourth embodiment mounted to a drum assembly at an angle;

FIG. 28 is a partial schematic view of a developing device of the fourth embodiment mounted to a drum assembly at another angle;

FIG. 29 is a front view of a developing device mounted to a drum assembly in the fifth embodiment;

FIG. 30 is a side view of a developing device mounted to a drum assembly in the fifth embodiment;

FIG. 31 is a schematic perspective view showing a developing device and drum assembly in a fifth embodiment;

FIG. 32 is a partially enlarged schematic view of the structure of FIG. 31A;

FIG. 33 is a schematic view showing a perspective structure of a first end of a developing device in a fifth embodiment;

fig. 34 is a schematic perspective view of a second end of the developing device in the fifth embodiment.

Detailed Description

The present utility model will now be described in further detail with reference to the accompanying drawings, wherein the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and include, for example, either fixedly attached, detachably attached, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

In the above description, descriptions of the terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Example 1

As shown in fig. 1 to 6, the present embodiment discloses a developing device that can be detachably mounted on a drum assembly in an image forming apparatus, the developing device including a cartridge 1, a developing assembly, a transmission assembly, a recognition assembly, a detected assembly, a power supply assembly, a first protective cover 111, and a second protective cover 121. The case 1 includes a cover and a housing.

In the following description of the direction, the left side of the paper in fig. 1 is left, the right side of the paper in fig. 1 is right, the upper side of the paper in fig. 1 is up, the lower side of the paper in fig. 1 is down, the near side of the paper in fig. 1 is front, and the far side of the paper in fig. 1 is rear when viewed in the direction perpendicular to the paper in fig. 1. The left-right direction is an embodiment of the first direction, the front-back direction is an embodiment of the second direction, and the up-down direction is an embodiment of the third direction. The first direction, the second direction and the third direction are mutually perpendicular.

As shown in fig. 1 and 2, the cartridge 1 has a housing chamber for housing developer therein, the cartridge 1 has a first end 11 and a second end 12 disposed opposite to each other in a first direction, the cartridge 1 has a third end 13 and a fourth end 14 disposed opposite to each other in a second direction, and the cartridge 1 has a fifth end 15 and a sixth end 16 disposed opposite to each other in the third direction. The box body 1 is provided with a powder outlet, the powder outlet is positioned at a third end 13, the box body 1 is provided with a handle, and the handle is positioned at a fourth end 14. The fifth end 15 is located on the cover, and the first end 11, the second end 12, the third end 13, the fourth end 14, and the sixth end 16 are all located on the housing.

The separation line is a straight line which is parallel to the third direction and passes through the bottommost part of the accommodating cavity. One side of the separation line, which is close to the opening, is an opening end, and one side of the separation line, which is far away from the opening, is a closed end. The outer surface of the closed end extends from the bottommost portion of the receiving chamber to the topmost portion of the receiving chamber. The handle is located on the closed end and the fourth end 14 is located on the closed end.

As shown in fig. 1 and 2, the developing assembly includes a developing roller 131, a powder feeding roller, and a stirring frame, and the developing roller 131, the powder feeding roller, and the stirring frame are rotatably installed in the accommodating chamber between the first end face 11a and the second end face 12 a. The rotation axes of the developing roller 131, the powder feeding roller, and the stirring frame all extend in the first direction. The developing roller 131 is disposed at the powder outlet. The toner feed roller is disposed immediately adjacent to the developing roller 131. The toner feed roller is closer to the fourth end 14 of the cartridge 1 than the developing roller 131. The stirring frame is for stirring the developer in the accommodating chamber to charge the developer and prevent the developer from agglomerating, and is closer to the fourth end 14 of the cartridge 1 than the developing roller 131 in the second direction. In the second direction, the area between the developing roller 131 and the agitator is the first area. The second end 12 of the box 1 is provided with a supporting frame 122, and one end of the developing roller 131 and the powder feeding roller, which is close to the second end of the box 1, is supported on the supporting frame.

As shown in fig. 2 and 3, the transmission assembly is disposed at the first end 11, and the transmission assembly includes a driving part rotatably mounted on the first end 11 of the case 1, and a rotation axis of the driving part is parallel to the first direction. The driving part includes a first driving gear 22, a second driving gear 23, and a power receiving part 21 coaxially integrally formed, the second driving gear 23 being located between the first driving gear 22 and the power receiving part 21 in a first direction, the first driving gear 22 being closer to the first end face 11a of the case 1 than the power receiving part 21 in the first direction. The power receiving portion 21 is for coupling with a power output shaft on the image forming apparatus to receive power output from the image forming apparatus.

As shown in fig. 3, the transmission assembly further includes a developing roller gear 24, a powder feeding roller gear 25, and a stirring gear 26, and the developing roller gear 24 is coaxially and fixedly installed at one end of the developing roller 131 near the first end 11 of the cartridge body 1. The powder feeding roller gear 25 is coaxially and fixedly arranged at one end of the powder feeding roller close to the first end 11 of the box body 1. The stirring gear 26 is coaxially and fixedly mounted at one end of the stirring frame near the first end 11 of the box body 1.

The developing roller gear 24 and the powder feeding roller gear 25 are engaged with the first driving gear 22. The stirring gear 26 is meshed with the second drive gear 23. The engagement may be direct engagement or indirect engagement.

As shown in fig. 3, the rotation axis of the driving part is closer to the fifth end 15 and the fourth end 14 of the cartridge 1 than the rotation axis of the developing roller 131, the rotation axis of the driving part is closer to the fifth end 15 and the fourth end 14 of the cartridge 1 than the rotation axis of the powder feeding roller, and the rotation axis of the driving part is closer to the third end 13 and the fifth end 15 of the cartridge 1 than the rotation axis of the stirring frame.

As shown in fig. 5 and 6, the box 1 is provided with a pushed component, and in the second direction, the pushed component is located outside the first area, and in this embodiment, the pushed component is closer to the fourth end 14 of the box 1 than the stirring frame. The case body includes a first concave portion 61 integrally formed at the first end 11 of the case body 1, and a second concave portion 65 integrally formed at the second end 12 of the case body 1, and both the first concave portion 61 and the second concave portion 65 are formed along the first direction and concave toward the inside of the case body 1. The first recess 61 has intersecting first and second surfaces 611, 612 and the second recess 65 has intersecting third and fourth surfaces 651, 652. The first surface 611, the second surface 612, the third surface 651, and the fourth surface 652 are all located on the outer surface of the case 1. The first direction is orthogonal to the first surface 611 and the third surface 651, and the first direction is parallel to the second surface 612 and the fourth surface 652. The second surface 612 and the fourth surface 652 are located on the outer surface of the closed end, and the first end 11 of the case 1 includes a first surface 611 and a first end face 11a. The second end 12 of the cartridge 1 comprises a third surface 651 and a second end face 12a. The first end surface 11a is closer to the right end of the developing roller 131 than the first surface 611 in the first direction. The second end surface 12a is closer to the left end of the developing roller 131 than the third surface 651 in the first direction.

As shown in fig. 5 and 6, the pushed assembly includes pushed pieces, the pushed pieces are block members, and the number of the pushed pieces is two, namely, a first pushed piece 62 integrally formed on the first surface 611 and a second pushed piece 66 integrally formed on the third surface 651. The first pushed member 62 protrudes from the first surface 611 along the first direction, and the second pushed member 66 protrudes from the third surface 651 along the first direction. The first pushed member 62 has a space between the second surface 612. The second pushed member 66 has a space between it and the fourth surface 652. The surfaces of the first pushed member 62 and the second pushed member are at least partially cambered surfaces, and preferably, the lower surfaces and the rear surfaces of the first pushed member 62 and the second pushed member 66 are connected by a cambered surface. Alternatively, the pushed member and the box body may be in a split structure, for example, the first pushed member is fixed on the first surface by means of adhesion, clamping, welding, and the like, and the second pushed member is fixed on the third surface by means of adhesion, clamping, welding, and the like.

In the process of installing the developing device on the drum assembly, a user applies an external force to the developing device, and the circular arc surfaces on the first pushed member 62 and the second pushed member 66 push the forced pushing assembly on the drum assembly under the action of the external force, so that the forced pushing assembly generates elastic deformation to avoid the first pushed member 62 and the second pushed member 66, and the forced pushing assembly is prevented from blocking the installation of the developing device. When the developing device is completely mounted on the drum assembly, the first pushed member 62 and the second pushed member 66 of the forced pushing assembly on the drum assembly apply elastic force, so that the first pushed member 62 and the second pushed member 66 drive the box body 1 to approach towards the direction of the photosensitive drum, and further the box body 1 drives the developing roller 131 to abut against the photosensitive drum, and tight contact between the developing roller 131 and the photosensitive drum is ensured.

As shown in fig. 4, the detected component includes a detected member 4 that receives the power of the driving part and moves between a first state and a second state, and the detected member 4 is rotatably mounted on the second end 12 of the case 1, specifically, on the support frame 122. The detected piece 4 is provided with a detected end and a driven end, and the second protecting cover 121 is provided with an opening for the detected end to extend out. In the first state, the detected end is not in contact with the detection piece in the image forming apparatus. In the second state, the detected end touches a detecting member in the image forming apparatus, so that the developing device is detected by the image forming apparatus. And in the second state the distance of the detected end in the third direction from the fifth end 15 of the cartridge 1 is smaller than the distance of the detected end in the third direction from the fifth end 15 of the cartridge 1 in the first state.

In the second direction, the detected end is closer to the fourth end 14 of the cartridge 1 than the rotation axis of the developing roller 131 and the rotation axis of the toner feeding roller. In the second direction, the detected end is closer to the third end 13 of the cartridge 1 than the rotational axis of the agitator frame.

As shown in fig. 4, the power supply assembly includes a conductive member, which is located at the second end 12 of the case 1 and has an electric receiving surface 5 thereon, and further has a first power supply terminal electrically connected to one end of the developing roller 131 near the second end 12 of the case 1 and a second power supply terminal electrically connected to one end of the powder feeding roller near the second end 12 of the case 1. The electric receiving surface 5 is used to make contact with a power supply portion on the image forming apparatus to form an electric connection, and to guide the voltage of the image forming apparatus to the developing roller 131 and the toner feeding roller through the first power supply terminal and the second power supply terminal so that the developing roller 131 and the toner feeding roller have a voltage.

The electric receiving surface 5 is closer to the fourth end 14 of the cartridge 1 than the rotation axis of the developing roller 131 and the rotation axis of the toner feeding roller in the second direction. The electric receiving surface 5 is closer to the third end 13 of the cartridge 1 than the rotation axis of the agitator frame in the second direction.

As shown in fig. 1 and 2, a first protective cover 111 is removably fixedly mounted to the first end 11 of the housing 1, the first protective cover 111 covering the drive assembly for protecting the drive assembly. The second protecting cover 121 is detachably and fixedly mounted to the second end 12 of the box body 1, the second protecting cover 121 is used for protecting the detected component, an upper cover 123 is further arranged on the upper side of the second protecting cover 121, and the upper cover 123 and the second protecting cover 121 are jointly used for protecting the detected component. The first cover 111, the second cover 121, and the upper cover 123 may be connected to the first end 11 and the second end 12 of the case 1, respectively, using screws. Alternatively, the connection can be made by means of a buckle or the like.

As shown in fig. 1 and 2, the identification assembly comprises a storage medium 32, an electrical contact surface 3, a holder 31. The storage medium 32 is used for storing data, and the electrical contact surface 3 is used for contacting and electrically connecting with the identification contact in the image forming apparatus. The holder 31 is detachably mounted on the first protective cover 111, and the storage medium 32 and the electrical contact surface 3 are electrically connected and are both mounted on the holder 31. The electrical contact surface 3 is located closer to the rear side of the cartridge 1 than to the central axis of the drive section.

The following is a working procedure of the developing device disclosed in the present embodiment, first, the developing device is mounted to a drum assembly in an image forming apparatus. The driving unit receives power output from the image forming apparatus and drives the developing roller 131, the powder feeding roller, and the agitator to rotate. While the power of the driving part drives the detected piece 4 to move. So that the inspected part 4 moves between the first state and the second state. And then touching the detecting piece in the image forming device, so that the developing device is detected by the image forming device, and the image forming device can further generate a printing instruction to start normal printing.

Example two

As shown in fig. 7 to 11, the difference between the present embodiment and the first embodiment is that the first pushed member 62 is integrally formed on the first protecting cover 111, and the second pushed member 66 is integrally formed on the second protecting cover 121. The pushed assembly further comprises two supporting parts, namely a first supporting part 63 integrally formed on the first surface 611 and a second supporting part 64 integrally formed on the third surface 651. The first supporting portion 63 cooperates with the first pushed member 62 and supports the first pushed member 62. The second supporting portion 64 cooperates with the second pushed member 66 and supports the second pushed member 66. The first pushed member 62 and the first supporting portion 63 are identical in structure to the second pushed member 66 and the second supporting portion 64, and the specific structure will be described below taking the first supporting portion 63 and the first pushed member 62 as an example.

As shown in fig. 7 to 11, the first pushed member 62 includes a first extension 1111 formed by extending from the first cover 111 in the first direction toward the direction approaching the case 1, the first extension 1111 overlapping with the projection of the first recess 61 in the second direction, a reinforcing rib integrally formed on the first extension 1111, and the first pushed member 62 protruding from the outer surface of the first extension 1111 in the direction away from the case 1. The first pushed member 62 has a curved plate shape, that is, a surface (outer side surface) of the first pushed member 62 in a direction away from the case 1 is an arc surface, and a surface (inner side surface) of the first pushed member 62 in a direction close to the case 1 is also an arc surface. The first supporting portion 611 is a plate or block, and the first supporting portion 63 protrudes from the first surface 611 along the first direction with a space between the first supporting portion 63 and the second surface 612. In the second direction, an end of the first supporting portion 63 away from the second surface 612 forms an arc surface matching with a surface of the first pushed member 62 near the box 1.

When the first protective cover 111 is assembled to the case 1, the first supporting portion 63 is located inside the first pushed member 62 and contacts the surface inside the first pushed member 62.

In the process of installing the developing device disclosed in this embodiment on the drum assembly, a user applies an external force to the developing device, so that the first pushed member 62 and the second pushed member 66 push the push assembly on the drum assembly under the action of the external force, so that the push assembly is elastically deformed to avoid the first pushed member 62 and the second pushed member 66, and the push assembly is prevented from blocking the installation of the developing device. When the developing device is completely mounted on the drum assembly, the first pushed member 62 and the second pushed member 66 of the pushing assembly on the drum assembly apply elastic force, so that the first pushed member 62 and the second pushed member 66 transmit force to the first supporting portion 63 and the second supporting portion 64, the first supporting portion 63 and the second supporting portion 64 drive the cartridge 1 to approach towards the direction of the photosensitive drum, and the cartridge 1 drives the developing roller 131 to abut against the photosensitive drum, so that the tight contact between the developing roller 131 and the photosensitive drum is ensured.

The first pushed member 62 and the second pushed member 66 are supported by the first supporting portion 63 and the second supporting portion 64, so that deformation and damage of the first pushed member 62 and the second pushed member 66 under the action of elastic force applied by the pushing assembly are avoided.

As shown in fig. 12, in some modification of the second embodiment, the second supporting portion 64 is integrally formed on the third surface 651, and the second supporting portion 64 protrudes from the third surface 651 along the second direction. In the second embodiment, when the first supporting portion 63 receives the external force applied by the pushing component, the force received by the connecting surface between the second supporting portion 64 and the third surface 651 is a shearing force. In this modification, when the first support 63 receives an external force applied by the urging assembly, the force received by the connection surface between the second support 64 and the third surface 651 is a pressure, so that the strength of the first support 63 is improved and damage is avoided. The first supporting portion 63 is the same and will not be described again.

In other variations of the second embodiment, the first support portion 63 and the second support portion 64 have a columnar shape extending in the first direction. The first pushed member 62 is provided with a first supporting hole into which the first supporting portion 63 is inserted, and the second pushed member 66 is provided with a second supporting hole into which the second supporting portion 64 is inserted, so that the supporting effect of the supporting portion on the pushed member can be realized.

Example III

As shown in fig. 13 to 15, the present embodiment provides a developing device that can be detachably mounted on an existing drum assembly 9, and that can be mounted to an image forming apparatus together after the developing device is mounted to the drum assembly 9. The drum assembly 9 includes a drum frame including a bottom wall 90, a first side wall 9A, a second side wall 9B, and a front frame 9C, a photosensitive drum 96, and a push assembly including a first abutment 91 and a second abutment 92. The photosensitive drum 96 may form an electrostatic latent image after charging and is used for developing, and the photosensitive drum 96 is disposed at the front frame 9C and is at least partially covered by the front frame 9C, so that the photosensitive drum 96 is protected by the front frame 9C. The bottom wall 90 is used for carrying a developing device, in a first direction, the first side wall 9A and the second side wall 9B are respectively located at two ends of the bottom wall 90, the first abutting portion 91 is located at an inner side of the first side wall 9A, the second abutting portion 92 is located at an inner side of the second side wall 9B, and in the first direction, a distance between the first abutting portion 91 and the first side wall 9A is smaller than a distance between the second abutting portion 92 and the second side wall 9B. The first abutment 91 and the second abutment 92 can exert a urging force on the developing device when the developing device is mounted to the drum assembly 9.

As shown in fig. 15 to 24, the developing device includes a cartridge 1, a developing assembly, a transmission assembly, a detected member 4, a power supply member, a pushed assembly, and a protective cover 111.

The cartridge 1 has a housing chamber for housing developer therein, the cartridge 1 has a first end 11 and a second end 12 disposed opposite to each other in a first direction, the cartridge 1 has a third end 13 and a fourth end 14 disposed opposite to each other in a second direction, and the cartridge 1 has a fifth end 15 and a sixth end 16 disposed opposite to each other in the third direction. The case 1 is provided with a handle 141, the handle 141 being located at the fourth end 14. The protecting cover 111 is detachably and fixedly arranged at the first end 11 of the box body 1, the protecting cover 111 at least covers the transmission assembly and the detected piece 4, and the protecting cover 111 is used for protecting the transmission assembly and the detected piece. The second end 12 of the casing 1 is provided with a conductive member protruding outwardly in the first direction with respect to the second end 12 of the casing 1, the conductive member having an electric receiving surface 5, the electric receiving surface 5 being in contact with a power supply portion of the image forming apparatus to receive electric power output from the image forming apparatus and transmit the electric power to a developing roller 131 connected thereto.

The developing assembly includes a developing roller 131, a stirring frame (not shown) and a powder feeding roller (not shown), and the developing roller 131, the stirring frame and the powder feeding roller are rotatably installed in the accommodating chamber between the first end 11 and the second end 12. The rotational axes of the developing roller 131, the agitating frame, and the powder feeding roller all extend in the first direction. The toner feeding roller is disposed in close proximity to the developing roller 131, and the developing roller 131 is closer to the third end 13 of the cartridge 1 than the toner feeding roller in the second direction. After the developing device is mounted to the drum assembly 9, the developing roller 131 is used to contact the photosensitive drum 96 on the drum assembly 9 and supply the developer to the photosensitive drum 96. The stirring frame is used for stirring the developer in the accommodating cavity, so that friction is generated on the developer and the developer is prevented from caking. In the second direction, the agitator is closer to the fourth end 14 of the cartridge 1 than the developing roller 131. In the second direction, the area between the developing roller 131 and the agitator is the first area.

As shown in fig. 16 and 17, a transmission assembly is provided at the first end 11 of the case 1, the transmission assembly including a driving part rotatably mounted on the first end 11 of the case 1, the rotation axis of the driving part being parallel to the first direction. The drive section includes a drive gear 22 and a power receiving section 21 that are coaxially integrally formed, the drive gear 22 being closer to the first end 11 of the case 1 than the power receiving section 21 in the first direction. The power receiving portion 21 is for coupling with a power output shaft on the image forming apparatus to receive power output from the image forming apparatus.

The transmission assembly further includes a developing roller gear 24, a powder feeding roller gear 25, a first transfer gear 27, a stirring gear 26, a second transfer gear 28, and a third transfer gear 29. The developing roller gear 24 is coaxially and fixedly arranged at one end of the developing roller 131 close to the first end 11 of the box body 1, the powder feeding roller gear 25 is coaxially and fixedly arranged at one end of the powder feeding roller close to the first end 11 of the box body 1, and the stirring gear 26 is coaxially and fixedly arranged at one end of the stirring frame close to the first end 11 of the box body 1. The first transfer gear 27, the second transfer gear 28 and the third transfer gear 29 are rotatably mounted at the first end 11 of the cartridge 1. The power receiving portion 21 receives the power formed after the output of the image, and transmits the power to each gear of the transmission assembly through the driving gear and rotates it.

The detected piece 4 is located at the first end 11 of the box body 1, the detected piece 4 and the third transmission gear 29 are coaxially arranged, the third transmission gear 29 can rotate the detected piece 4 after rotating, and the detected piece 4 is far away from the first end 11 of the box body 1 than the third transmission gear 29 in the first direction. The detected member 4 is used to contact with a detecting member in the image forming apparatus so that the entire developing apparatus is recognized by the image forming apparatus, and when the image forming apparatus recognizes the developing apparatus through the detected member, the developing apparatus can normally operate in the image forming apparatus.

As shown in fig. 16 and 18, the protecting cover 111 is detachably mounted to the first end 11 of the case 1, and the protecting cover 111 includes a first through hole 1112 and a second through hole 1113 integrally formed. The first through hole 1112 is used to expose the inspected member 4 so that the inspected member 4 can be smoothly contacted with the inspected member in the image forming apparatus, thereby completing the identification of the developing device by the image forming apparatus. The second through hole 1113 is for exposing the power receiving portion 21 so that the power receiving portion 21 can stably receive power output from the image forming apparatus.

As shown in fig. 18, the protecting cover 111 is further provided with a first mounting portion 17 for mounting the pushed assembly, and the first mounting portion 17 may be integrally formed with the protecting cover 111 or may be a split structure and fixed to the protecting cover 111 by means of adhesion, engagement, welding, or the like. The first mounting portion 17 has a substantially rectangular parallelepiped frame-like structure, and a rear end of the first mounting portion 17 is open. The first mounting portion 17 includes a first movable hole 171, a second movable hole 172, and a first guide protrusion 173. The first movable hole 171 and the second movable hole 172 are bar-shaped holes extending in the second direction, and the first movable hole 171 and the second movable hole 172 are opposite in the first direction, that is, the first movable hole 171 and the second movable hole 172 are respectively provided on both side walls of the first mounting portion 17 in the first direction. The first guide protrusion 173 is a plate-like member provided near the lower end of the first mounting portion 17 in the third direction.

As shown in fig. 19 and 20, the pushed assembly includes a first pushed member 62, where the first pushed member 62 is disposed at the first end 11 of the box 1, the first pushed member 62 is located outside the first area in the second direction, and the first pushed member 62 is further away from the third end 13 of the box 1 than the stirring frame. The first pushed member 62 includes an engagement portion, a first slide groove 623, a first support protrusion 624, and a first force receiving portion 625. The engaging portion includes a first detent 621 and a second detent 622, the first detent 621 and the second detent 622 are snap-fit structures formed by extending the first pushed member 62 from the rear to the front in the second direction, the first detent 621 and the second detent 622 can be respectively inserted into the first movable hole 171 and the second movable hole 172 of the first mounting portion 17 so that the first pushed member 62 is mounted to the protective cover 111, meanwhile, the snap-fit structures provided in the first detent 621 and the second detent 622 can prevent the first pushed member 62 from falling off, and the first pushed member 62 can move relative to the first movable hole 171 and the second movable hole 172 in the second direction, and the first detent 621 and the second detent 622 can have a certain elasticity so that the first pushed member 62 is smoothly mounted to the first mounting portion 17. The first slide groove 623 may be engaged with the first guide protrusion 173 of the first mounting portion 17, and may cause the first pushed member 62 to move along the first guide protrusion. Alternatively, the first guide protrusion may be provided on the first pushed member, and the first sliding groove may be provided on the first mounting portion, so that sliding fit between the first and second sliding grooves may be achieved.

The first force receiving portion 625 is a surface of the first push-receiving member 62 facing backward in the second direction, and the first force receiving portion 625 is configured to receive pressure from a pushing assembly of the developing device and to move the first push-receiving member 62 after receiving the pressure.

The pushed assembly further comprises a first elastic member 67 disposed at the first end of the case 1, and the first elastic member 67 can be compressed or stretched in the second direction. The first elastic member 67 may be partially sleeved on the first supporting protrusion 624 such that the first elastic member 67 is mounted to the first pushed member 62, an end of the first elastic member 67 away from the power receiving portion 21 may abut against an inner wall of the first pushed member 62 in the second direction, and an end of the first elastic member 67 close to the power receiving portion 21 may abut against an inner wall of the first mounting portion 17. When the first pushed member 62 receives a pressure in the second direction and moves forward and backward in the second direction, the first elastic member 67 is compressed, and after the pressure is lost, the first elastic member 67 expands in the second direction according to its own elastic force and moves the first pushed member 62 forward and backward in the second direction. It is understood that the pressure in the second direction may be a component of force acting indirectly in the second direction or may be a force acting directly in the second direction.

As shown in fig. 20 to 22, the case 1 is further provided with a second mounting portion 18 integrally formed with the case 1, the second mounting portion 18 being detachably mounted on a side wall of the second end 12 of the case 1, and the second mounting portion 18 being closer to the sixth end 16 than the fifth end 15. As can be seen, the second mounting portion 18 is identical to the internal structure of the first mounting portion 17, and the second mounting portion 18 includes a third movable hole 181, a fourth movable hole 182, and a second guide protrusion 183. The pushed assembly further includes a second pushed member 66 and a second elastic member 68, the second pushed member 66 has the same structure as the first pushed member 62, and the second pushed member 66 includes a third pawl (not shown), a fourth pawl (not shown), a second chute (not shown), a second supporting protrusion (not shown), and a second force receiving portion 665. The third and fourth pawls are insertable into the third and fourth movable holes 262 and 182, respectively, such that the second pushed member 66 is mounted to the second mounting portion 18, and the second pushed member 66 is movable relative to the second mounting portion 18. The second slide groove is engageable with the second guide protrusion 183 such that the second pushed member 66 is movable along the second guide protrusion 183. The second elastic member 68 may be partially sleeved on the second supporting protrusion, and in the second direction, an end of the second elastic member 68 away from the conductive member abuts against the inner wall of the second pushed member 66, and an end of the second elastic member 68 close to the conductive member abuts against the inner wall of the second mounting portion 18. The second force receiving portion 665 is configured to receive pressure from the outside and move the second pushed member 66. The second elastic member 68 is compressed when the second pushed member 66 receives an external pressure to generate a back-to-front movement in the second direction, and when the external pressure is removed, the second elastic member 68 expands according to its own elasticity and causes the second pushed member 66 to move from front to back in the second direction. In other embodiments, the structures of the second mounting portion 18 and the first mounting portion 17 may not be identical, the structures of the first pushed member 62 and the second pushed member 66 may not be identical, and in this embodiment, the structure of the second mounting portion 18 and the first mounting portion 17, and the structure of the first pushed member 62 and the second pushed member 66 are set to be identical, so that the process is convenient, and the second mounting portion 18 may also be detachably mounted on the second end 12 of the box body 1 by a connection manner such as a buckle according to the actual situation. The second end 12 of the cartridge 1 further includes a mounting protrusion 124, the mounting protrusion 124 being formed to extend outwardly from the second end 12 in a first direction in which the mounting protrusion 124 overlaps the agitator frame, the mounting protrusion 124 being adapted to facilitate mounting of the developing device to the drum assembly 9.

As shown in fig. 22 and 23, in order to adapt the structure of the existing drum assembly 9, in the present embodiment, the first mounting portion 17 is farther from the developing roller 131 than the second mounting portion 18 in the second direction, the first mounting portion 17 is closer to the fifth end 15 of the cartridge 1 than the second mounting portion 18 in the third direction, and therefore the first pushed member 62 mounted to the first mounting portion 17 in the second direction is farther from the developing roller 131 than the second pushed member 66 mounted to the second mounting portion 18, and the first pushed member 62 is closer to the fifth end 15 than the second pushed member 66 in the third direction. The projection of the second pushed member 66 in the first direction is at least partially located outside the projection of the case 1 in the first direction, specifically, at least part of the second mounting portion 18 protrudes from the sixth end 16 of the case 1 in the third direction, that is, at least part of the second pushed member 66 protrudes downward from the sixth end 16 of the case 1, and the projection of the part of the second pushed member 66 protruding from the sixth end 16 in the first direction is not within the projection range of the case 1. I.e. the first mounting portion 17 is not aligned with the second mounting portion 18, nor is the first pushed member 62 aligned with the second pushed member 66. And in the second direction, the first pushed member 62 is farther from the developing roller 131 than the stirring gear 26, the second pushed member 66 is farther from the developing roller 131 than the mounting projection 124, that is, the first pushed member 62 and the second pushed member 66 are both farther from the developing roller 131 than the stirring frame in the second direction, that is, the first pushed member 62 and the second pushed member 66 are both located outside the first region in the second direction.

As shown in fig. 13 and 24, the developing device may be mounted to the drum assembly 9, and the drum assembly 9 is provided with a pushing assembly including a first abutting portion 91 and a second abutting portion 92 which are not elastic, the first abutting portion 91 and the second abutting portion 92 exerting a pushing force on the first pushed member 62 and the second pushed member 66 on the developing device, respectively, so that the first pushed member 62 and the second pushed member 66 move along the first guide convex portion 173 and the second guide convex portion 183, respectively, and the first elastic member 67 and the second elastic member 68 are compressed and the pushing force is transmitted to the protecting cover 111 and the cartridge 1 through the first elastic member 67 and the second elastic member 68, so that a trend is generated in the cartridge 1, with which the developing roller 131 can be brought into close contact with the photosensitive drum 96 on the drum assembly 9, that is, that the first pushed member 62 and the second pushed member 66 receive the pushing force of the drum assembly 9 exerting a pushing force toward the photosensitive drum 96, so that the drum 96 is brought into close contact with the developing roller 131. And in the case where the developing device is mounted to the drum assembly 9, this tendency has been in existence, so that the developing roller 131 is kept in close contact with the photosensitive drum 96, so that the photosensitive drum 96 can stably receive the developer conveyed from the developing roller 131 after the image forming apparatus starts to operate normally.

As can be seen, when the developing device is mounted to the drum assembly 9, the second abutting portion 92 of the drum assembly 9 of the conventional structure is closer to the developing roller 131 than the first abutting portion 91 in the second direction, and the first abutting portion 91 is closer to the fifth end 15 than the second abutting portion 92 in the third direction. That is, the first pushed member 62 and the second pushed member 66 provided in the present embodiment cooperate with the first abutting portion 91, and cooperate with the second abutting portion 92, so that the first pushed member 62 and the second pushed member 66 simultaneously receive the urging force exerted by the drum assembly 9, and the developing roller 131 is ensured to be in stable and tight contact with the photosensitive drum.

When the developing device and the drum assembly 9 are taken out of the image forming apparatus and the developing device is taken out of the drum assembly 9, the first pushed member 62 and the second pushed member 66 lose urging force from the drum assembly 9, the first elastic member 67 and the second elastic member 68 stretch by their own elasticity, and the first pushed member 62 and the second pushed member 66 are caused to move back to the positions before being abutted.

The present embodiment provides the first push receiving piece 62 and the second push receiving piece 66 which constitute push receiving components on the developing device, and makes use of the existing structure of the drum component 9 to interfere with the first push receiving piece, so that the developing roller 131 on the developing device can be in close contact with the photosensitive drum 96 on the drum component 9, thereby ensuring the development quality of the image forming device.

Example IV

The structure of the developing device in this embodiment is the same as that in the third embodiment. The main distinguishing feature of this embodiment is that the pushed assembly on the developing device in this embodiment is further away from the cartridge in the first direction than the urging member in the third embodiment.

As shown in fig. 25 to 28, the protective cover 111A in the present embodiment is provided with the first mounting portion 17A, and the first mounting portion 17A in the present embodiment is further away from the first end 11 of the case in the first direction than the first mounting portion 17 in the third embodiment, but the present embodiment is identical in structure to the first mounting portion in the third embodiment. The structure of the first pushed member 62A in this embodiment is identical to that of the first pushed member 62 in the third embodiment, in this embodiment, the first pushed member 62A is detachably mounted to the first mounting portion 17A, and a first elastic member (not shown) is provided for abutting against the first mounting portion 17A and the first pushed member 62A.

In this embodiment, the second end 12 of the case 1 is provided with a bracket 125, and the bracket 125 is provided with a second mounting portion 18A, that is, the second mounting portion 18A in this embodiment is not directly provided on the case 1, but is provided on the bracket 125 of the second end 12 of the case 1, and the second mounting portion 18A in this embodiment is further away from the second end 12 of the case 1 in the first direction than the second mounting portion 18 in the third embodiment. The structure of the second pushed member 66A in this embodiment is identical to that of the second pushed member 66 in the third embodiment, and the second pushed member 66A in this embodiment is detachably mounted to the second mounting portion 18A, and a second elastic member (not shown) is provided for abutting against the second mounting portion 18A and the second pushed member 66A.

When the developing device is mounted to the drum assembly 9, the structure on the existing drum assembly 9 can be used to apply a pushing force to the pushed member on the developing device. The drum assembly 9 is provided with first abutment projections 93 and second abutment projections 94 at both ends, the first abutment projections 93 being formed by outwardly extending the first side walls 9A in the first direction, and the second abutment projections 94 being formed by outwardly extending the second side walls 9B in the first direction. The first abutment protrusion 93 may abut the first pushed member 62A and cause the first pushed member 62A to move, and the second abutment protrusion 94 may abut the second pushed member 66A and cause the second pushed member 66A to move. The first elastic member and the second elastic member are compressed while the first pushed member 62A and the second pushed member 66A are forced to move, and meanwhile, the forced pushing force is transmitted to the cartridge 1 through the first elastic member and the second elastic member, so that the developing roller 131 on the cartridge 1 can be in close contact with the photosensitive drum 96 on the drum assembly 9, and the development quality of the image forming apparatus during operation is ensured. It is known that the first abutment protrusion 93 and the second abutment protrusion 94 in the present embodiment and the first abutment portion 91 and the second abutment portion 92 in the third embodiment are both of the structure of the conventional drum assembly 9, and the first abutment portion 91 and the second abutment portion 92 in the third embodiment are located between the first abutment protrusion 93 and the second abutment protrusion 94 in the present embodiment in the first direction.

It will be appreciated that in this embodiment the first and second push members 62A and 66A are aligned in a first direction, and the first and second abutment projections 93 and 94 of the existing structure of the drum assembly 9 are aligned in the first direction.

When the developing device and the drum assembly 9 are taken out from the image forming apparatus and the developing device is taken out from the drum assembly 9, the first pushed member 62A and the second pushed member 66A lose the urging force from the drum assembly 9, the first compression spring and the second compression spring stretch by their own elasticity, and the first pushed member 62A and the second pushed member 66A are caused to move back to the positions before being abutted. In other embodiments, the structural sizes of the first pushed member 62A, the second pushed member 66, the first mounting portion 17A and the second mounting portion 18A may be adaptively optimized according to the size of the mounting space on the premise that the push-up function can be implemented.

Example five

In the prior art, a guiding component and a pushed component are required to be arranged on the developing device respectively, the guiding component is used for being matched with a guiding surface on the drum component to guide the developing device to move along the guiding surface, so that the developing device can be installed smoothly, the pushed component is used for being matched with a forced pushing component on the drum component to receive the pushing force of the forced pushing component, and therefore the developing device has more parts, complex structure and large occupied space.

As shown in fig. 29 to 34, the present embodiment discloses a developing device, which is different in structure of a pushed assembly thereof from the first to fourth embodiments. In addition, the structure of the urging assembly of the drum assembly is also different.

As shown in fig. 30, 31 and 33, in the present embodiment, the pushed assembly includes a guide projection 69 provided on the first protective cover 111, the guide projection 69 protruding from the outer surface of the first protective cover 111 in the first direction. The guide projection 69 is preferably cylindrical with an axial direction parallel to the first direction, and the diameter of the guide projection 69 is smaller than the diameter of the developing roller 131. The guide projection 69 is located on the front side of the rotation axis of the power receiving portion 21. Preferably, the guide projection 69 is disposed coaxially with the developing roller 131, and the projection of the guide projection 69 in the first direction is entirely located at the projection of the developing roller 131 in the first direction. Alternatively, the guide projection 69 may be disposed non-coaxially with the developing roller 131, and a projected portion of the guide projection 69 in the first direction is located within a projected range of the developing roller 131.

Alternatively, the guide projection 69 may be provided on the first end 11 of the case 1, and a hole for the guide projection 69 to protrude is provided on the first cover 111.

As shown in fig. 33, the distance from the rotation axis of the power receiving portion 21 to the guide projection 69 is smaller than the distance from the rotation axis of the stirring frame to the rotation axis of the power receiving portion 21 in the present embodiment.

As shown in fig. 29 to 31, the drum assembly 9 includes a drum frame, a photosensitive drum, and a urging assembly. The drum frame has a first side wall 9A and a second side wall 9B disposed opposite to each other in a first direction, and lower ends of the first side wall 9A and the second side wall 9B are connected by a bottom wall 90. The drum assembly 9 is rotatably mounted on the front side of the photosensitive drum, and the first and second side walls 9A, 9B of the rear side of the photosensitive drum are configured as mounting grooves for accommodating the developing device. After the developing device is mounted to the drum assembly 9, the first end 11 of the cartridge 1 is closer to the first side wall 9A than the second side wall 9B, and the second end 12 of the cartridge 1 is closer to the second side wall 9B than the first side wall 9A.

As shown in fig. 30 to 32, the first side wall 9A is integrally formed with a first guide surface 9A1. During the mounting of the developing device to the drum assembly 9, the guide projection 69 is brought into contact with the first guide surface 9A1, and the guide projection 69 is pressed down on the first guide surface 9A1 by gravity, i.e., at least a portion of the guide projection 69 is located within the range of the first guide surface 9A1 in the second direction, the first guide surface 9A1 is configured as a slope, and the front end of the first guide surface 9A1 is lower than the rear end. The first guide surface 9A1 may be a curved surface.

As shown in fig. 30 to 32, a limit groove 9A2 is provided on the first side wall 9A on the front side of the first guide surface 9A1, and the limit groove 9A2 has a front wall, an upper wall, and a lower wall, thereby blocking the movement of the guide projection 69 in the up-down direction and the forward direction. The rear end of the limit groove 9A2 is not closed (i.e., the rear end of the limit groove 9A2 is open) for the guide protrusion 69 to enter. The lower wall of the limit groove 9A2 is at the same height as the lower end of the guide surface in the third direction.

As shown in fig. 30 to 32, a push-push assembly is provided on the first side wall 9A, the push-push assembly including a push-push member 95, a third elastic member 97. The pushing member 95 is a block-shaped member, the front end of the pushing member 95 in the second direction is a force application end, the rear end of the pushing member 95 in the second direction is a force application end, the front end of the pushing member 95 at least partially shields the opening of the limiting groove 9A2, the rear end of the pushing member 95 is fixedly connected with the third elastic member 97, the first side wall 9A is provided with a supporting groove along the second direction, and the supporting groove is located below the first guide surface 9A 1. One end of the third elastic member 97 is abutted against the rear wall of the supporting groove, the other end of the third elastic member 97 is abutted against the stressed end of the urging member 95, that is, the third elastic member 97 is defined between the urging member 95 and the rear wall of the supporting groove, and the third elastic member 97 can apply a force to the urging member 95 in the second direction toward the photosensitive drum. The third elastic member 97 may be a compression spring.

As shown in fig. 30 to 32, a chute is provided on the first side wall 9A between the first guide surface 9A1 and the limit groove 9A2, and the urging member 95 is mounted in the chute, and the urging member 95 can slide along the front-rear direction. The upper end of the pushing member 95 is integrally formed with a guide portion, the guide portion is in a protruding shape protruding upwards at the upper end of the pushing member 95, and the guide portion is arranged close to the front end of the pushing member 95 in the second direction. The guide includes a second guide surface 951 and a third guide surface 952. The second guide surface 951 and the third guide surface 952 are each configured as a bevel. The front end of the second guide surface 951 is connected to the rear end of the third guide surface 952. The front end of the third guide surface 952 is connected to the front end of the urging member 95. The front end of the second guide surface 951 is located further upward than the rear end of the second guide surface 951, i.e., the rear end of the second guide surface 951 is located lower than the front end thereof. The front end of the third guide surface 952 is lower than the rear end of the third guide surface 952, i.e., the front end of the third guide surface 952 is lower than the rear end thereof. The second guide surface 951 and the third guide surface 952 may also be provided with curved surfaces. The second guide surface 951 is configured to prevent the push assembly from avoiding the collar 1114 and interfering with the collar 1114.

As shown in fig. 29 to 34, in the process of mounting the developing device to the drum assembly 9, the guide projection 69 is brought into contact with the first guide surface 9A1, the guide projection 69 is pressed down on the first guide surface 9A1 by gravity, and the guide projection 69 moves in the inclined direction of the first guide surface 9A1 by gravity and the pushing force applied by the user toward the photosensitive drum direction due to the inclined surface of the first guide surface 9 A1. And then the guide projection 69 moves to the upper end of the push member 95 and presses against the upper surface of the push member 95. The guide protrusion 69 then moves in the inclined direction of the second guide surface 951 under the pushing force of the user such that the guide protrusion 69 is lifted by the second guide surface 951, and the guide protrusion 69 moves onto the third guide surface 952 such that the guide protrusion 69 moves in the inclined direction of the third guide surface 952 under the force of gravity and the pushing force of the user. Since the third guide surface 952 is an inclined surface, the pressure applied by the guide protrusion 69 to the third guide surface 952 has a rearward component force, so that the push member 95 slides rearward to avoid the guide protrusion 69, and the guide protrusion 69 enters the limit groove 9A2, the limit groove 9A2 prevents the guide protrusion 69 from moving forward and upward and downward, meanwhile, the avoidance of the push member 95 causes the third elastic member 97 to be compressed, the push member 95 abuts against the guide protrusion 69 under the elastic force of the third elastic member 97, the push member 95 prevents the guide protrusion 69 from moving rearward, and the guide protrusion 69 is subject to forward thrust, the guide protrusion 69 transmits the thrust to the whole box 1, so that the box 1 carries the developing roller 131 against the photosensitive drum, and the gap between the developing roller 131 and the photosensitive drum is prevented from generating to affect the printing quality.

When the developing device is removed from the drum assembly 9, the developing device is pulled backward, and the guide projection 69 applies a backward force to the urging member 95, so that the urging member 95 is retracted from the guide projection 69 while the third elastic member 97 is compressed. The urging member 95 is prevented from catching the guide projection 69.

The process cartridge is constituted by assembling the developing device and the drum assembly 9 disclosed in the present embodiment.

The guide projection 69 disclosed in this embodiment may be provided on the second end 12 of the case 1 or the second cover 121, and the urging member may be provided on the second side wall 9B.

What has been described above is merely some embodiments of the present utility model. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the utility model.

Claims

1. A developing device detachably mountable to an image forming apparatus including a drum assembly including a photosensitive drum and a urging assembly; wherein the developing device comprises:

in a second direction, the pushed assembly is located outside the first region.

2. A developing device according to claim 1, wherein said first end is provided with a first recess having intersecting first and second surfaces, said first surface being orthogonal to said first direction, said second surface being parallel to said first direction;

3. The developing device according to claim 1, wherein the pushed assembly includes a pushed member provided on the protective cover, the pushed assembly further including a support member for supporting the pushed member, the support member being provided on the cartridge body and inside the pushed member.

4. A developing device according to claim 1, wherein said pushed assembly includes a second pushed member provided at said second end, said developing device including a second mounting portion for mounting said second pushed member, said second pushed member being movably provided at said second mounting portion;

5. The developing device according to claim 4, wherein a projection of the second pushed member in the first direction is at least partially located outside a projection of the cartridge body in the first direction.

6. The developing device according to claim 4, wherein the cartridge body has opposite fifth and sixth ends in a third direction intersecting the first and second directions;

The second pushed piece at least partially protrudes from the sixth end.

7. The developing device according to claim 6, wherein the pushed assembly includes a first pushed member provided at the first end, the first pushed member being closer to the fifth end than the second pushed member in the third direction.

8. A developing device according to claim 4, wherein one of said second pushed member and second mounting portion is provided with a second slide groove, and the other is provided with a second guide projection that mates with said second slide groove.

9. A developing device according to any one of claims 1-8, wherein said pushed members are provided at both ends of said developing device in the first direction, respectively, and the pushed members at both ends are aligned or not aligned in the first direction.

10. A developing device detachably mountable to an image forming apparatus including a drum assembly including a photosensitive drum, a drum frame, and a urging assembly; wherein the developing device comprises:

11. A developing device according to claim 10, wherein said pushed member includes a guide projection provided to protrude from an outer surface of said cartridge body or an outer surface of the cover in the first direction.

12. The developing device of claim 11, wherein a projection of the pushed assembly in the first direction at least partially coincides with a projection of the developing roller in the first direction.

13. A drum assembly comprising a photosensitive drum, a drum frame, and a push assembly, wherein a developing device according to any one of claims 10 to 12 is mounted to the drum frame;

14. The drum assembly of claim 13, wherein the first guide surface is provided with a limit groove on a front side in the second direction, the limit groove being open at a rear end in the second direction, the limit groove limiting movement of the pushed assembly in the third direction and forward in the second direction after the pushed assembly moves along the first guide surface from the opening into the limit groove.

15. The drum assembly of claim 14, wherein the urging assembly includes an urging member and a third elastic member defined between the urging member and the drum frame, the third elastic member exerting a force on the urging member in the second direction toward the photosensitive drum;

16. Drum assembly according to claim 15, wherein the front end of the urging member in the second direction is provided with an upwardly protruding guide portion, which guide portion is located between the first guide surface and the limit groove in the second direction;