Developing box

Abstract

The developing box comprises a box body; a developing roller; a drive unit; the electric contact surface is arranged at the first end of the box body; the forced pushing assembly is used for receiving the forced pushing force from the drum assembly, so that the developing roller is in contact with the photosensitive drum, and the forced pushing assembly comprises a first forced pushing piece movably arranged at the first end and a second forced pushing piece movably arranged at the second end; the first forced pushing piece comprises a first forced pushing part used for receiving forced pushing force, and the second forced pushing piece comprises a second forced pushing part used for receiving the forced pushing force; the forced pushing assembly further comprises a first elastic piece and a second elastic piece. The first elastic piece is arranged to deform when the first forced pushing part receives the forced pushing force to move, so that the developing roller is in contact with the photosensitive drum; the second elastic piece is arranged to deform when the second forced pushing part receives the forced pushing force to move, so that the developing roller is in contact with the photosensitive drum. Through the arrangement of the first elastic piece, the second elastic piece, the first forced pushing part and the second forced pushing part, the developing roller and the photosensitive drum are in tight contact, and the imaging quality is improved.

Description

Technical Field

[0001] The present application relates to the field of electronic imaging technology, and in particular to a developing box. Background Art

[0002] A developing cartridge is a detachable part widely used in image forming devices, and includes a developing roller. An image forming device is generally equipped with four developing cartridges corresponding to the four photosensitive drums on the image forming device. Each developing cartridge contains a developer of a different color. The developing roller contacts the photosensitive drum and transfers toner to the photosensitive drum, allowing the image forming device to utilize toner of various colors to better form an image and meet more printing needs of the user. In order to ensure stable contact between the developing roller and the photosensitive drum to transfer toner, a pushing assembly is provided on the developing cartridge. The pushing assembly is used to receive the pushing force applied by the image forming device, so that the developing roller and the photosensitive drum are in contact, thereby ensuring the imaging quality of the image forming device. Existing pushing assemblies cannot ensure close contact between the developing roller and the photosensitive drum, thereby affecting the imaging quality. Utility Model Content

[0003] The utility model provides a developing box, which can be detachably combined with a drum assembly and can be detachably installed on an image forming device. The drum assembly includes a photosensitive drum, and the developing box includes:

[0004] a box body for storing developer, the box body having a first end and a second end opposite to each other in a first direction, and a third end and a fourth end opposite to each other in a second direction;

[0005] a developing roller rotatably disposed on the cartridge body about a first direction;

[0006] a driving portion, configured to receive a driving force from the image forming device and rotate, the driving portion being disposed at the first end;

[0007] an electrical contact surface, disposed at the first end of the box body; and

[0008] The pushing assembly is used to receive the pushing force from the drum assembly so that the developing roller and the photosensitive drum come into contact with each other. The pushing assembly includes a first pushing member movably provided at the first end and a second pushing member movably provided at the second end. The first pushing member includes a first pushing portion for receiving the pushing force, and the second pushing member includes a second pushing portion for receiving the pushing force.

[0009] The forced pushing assembly further includes a first elastic member and a second elastic member;

[0010] The first elastic member is configured to deform when the first urging portion receives the urging force and moves, thereby making the developing roller contact the photosensitive drum;

[0011] The second elastic member is configured to deform when the second urging portion receives the urging force and moves, thereby bringing the developing roller into contact with the photosensitive drum.

[0012] The utility model makes the developing roller and the photosensitive drum contact closely by arranging the first elastic member, the second elastic member, the first forcing portion and the second forcing portion, thereby improving the imaging quality.

[0013] In some embodiments, when viewed along a third direction intersecting the first direction and the second direction, at least one of the first pushing member and the second pushing member at least partially overlaps with the driving portion;

[0014] In some embodiments, the first elastic member is configured to be stretched when the first pushing portion receives the pushing force, and the second elastic member is configured to be compressed when the second pushing portion receives the pushing force, or the first elastic member is configured to be compressed when the first pushing portion receives the pushing force, and the second elastic member is configured to be stretched when the second pushing portion receives the pushing force.

[0015] In some embodiments, the first pushing portion and the second pushing portion have different structures;

[0016] In the second direction, the first urging portion is closer to the developing roller than the second urging portion, or the first urging portion is farther away from the developing roller than the second urging portion.

[0017] In some embodiments, when viewed along a third direction intersecting the first direction and the second direction, the rotation axis of the drive portion at least partially overlaps with the first pushing member, and / or, when viewed along the third direction, the rotation axis of the drive portion at least partially overlaps with the second pushing member.

[0018] In some embodiments, in the second direction, the first pushing portion and the second pushing portion are located between the electrical contact surface and the rotation axis of the developing roller; in the second direction, the distance between the first pushing portion and the electrical contact surface is a first distance, and the distance between the first pushing portion and the rotation axis of the developing roller is a second distance, and the first distance is greater than the second distance; in the second direction, the distance between the second pushing portion and the electrical contact surface is a third distance, and the distance between the first pushing portion and the rotation axis of the developing roller is a fourth distance, and the third distance is less than the fourth distance.

[0019] In some embodiments, the first forced pushing portion is a first connecting portion, the second forced pushing portion is a second connecting portion, and the drum assembly is provided with a third connecting portion and a fourth connecting portion;

[0020] When the developing box is installed on the drum assembly, the first connecting part and the third connecting part cooperate to lock the first elastic part, so that the developing roller and the photosensitive drum are in contact. The second connecting part and the fourth connecting part cooperate to lock the second elastic part, so that the developing roller and the photosensitive drum are in contact.

[0021] In some embodiments, the first connecting portion and the second connecting portion are hooks, and the third connecting portion and the fourth connecting portion are grooves.

[0022] The first elastic member and the second elastic member are configured to be stretched when the first connection portion and the second connection portion are respectively engaged with the third connection portion and the fourth connection portion.

[0023] In some embodiments, a first inclined surface is provided on the first connecting portion, and a second inclined surface is provided on the second connecting portion; during the process of installing the developing box to the drum assembly, the first inclined surface is used to make the first connecting portion avoid the third connecting portion and then insert into the third connecting portion, and the second inclined surface is used to make the second connecting portion avoid the fourth connecting portion and then insert into the fourth connecting portion.

[0024] In some embodiments, the developing box further includes a stirring frame, and the driving portion is coaxially arranged with the stirring frame and drives the stirring frame to rotate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 1 is a schematic structural diagram of the developing cartridge in Example 1;

[0026] Figure 2 is a structural schematic diagram of the first end of the developing cartridge in Example 1;

[0027] Figure 3 is a structural schematic diagram of the second end of the developing cartridge in Example 1;

[0028] Figure 4 is a partial exploded view of the developing cartridge in Example 1;

[0029] Figure 5 is a structural schematic diagram of the developer cartridge being mounted to the drum assembly in the first embodiment;

[0030] Figure 6 is a cross-sectional view of the developing cartridge mounted to the drum assembly in the first embodiment;

[0031] Figure 7 is a cross-sectional view of another perspective of the developer cartridge being mounted to the drum assembly in the first embodiment;

[0032] Figure 8 It is a structural schematic diagram of the developing cartridge in the second embodiment;

[0033] Figure 9 is a schematic structural diagram of the developing cartridge being mounted on the drum assembly in the second embodiment;

[0034] Figure 10 It is a structural diagram of the transmission component in Example 3.

[0035] In the picture:

[0036] 1. Developer cartridge; 10. Cartridge body; 11. First end; 12. Second end; 13. Third end; 14. Fourth end; 15. Fifth end; 111. First protective cover; 112. Bracket; 113. Storage medium; 114. First separator; 115. First mounting portion; 116. Connecting post; 117. First mounting portion; 121. Second protective cover; 1211. Second mounting portion; 122. Second separator; 123. Second mounting portion; 131. Developer roller; 132. Powder discharge blade; 133. Stirring frame; 134. Powder feed roller; 151. Friction portion; 40. Drive unit; 41. Developer gear; 42. Powder feed gear; 43. First idler gear; 44. Second idler gear; 45. Stirring gear; 46. Small third idler gear;

[0037] 31. First forcing member; 311. First forcing portion; 312. Supported portion; 32. First elastic member; 33. Second forcing member; 331. Second forcing portion; 34. Second elastic member; 35. First forcing member; 351. First connecting portion; 3511. First inclined surface; 36. First elastic member; 37. Second forcing member; 371. Second connecting portion; 3711. Second inclined surface; 38. Second elastic member; 2. Drum assembly; 21. Photosensitive drum; 221. First force-applying portion; 222. Second force-applying portion; 231. Third connecting portion; 232. Second connecting portion. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0039] In the description of this application, unless otherwise specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0040] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described from the perspectives shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also indirectly connected to the other element "on" or "under" through an intermediate element.

[0041] The present application will be further described in detail below with reference to the accompanying drawings.

[0042] In the following descriptions of directions, perpendicular to Figure 1 When viewed from the middle of the paper, Figure 1 The left side of the paper is left. Figure 1 The right side of the middle paper is right, Figure 1 The upper side of the paper is the top. Figure 1 The lower side of the middle paper is the bottom. Figure 1 The near side of the middle paper is the front, Figure 1 The far side of the middle paper is the back. 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.

[0043] Example 1:

[0044] like Figure 1-Figure 7 As shown, this embodiment provides a developing box 1, which is detachably mounted on a drum assembly 2 of an image forming device. A photosensitive drum 21, a first force applying portion 221 and a second force applying portion 222 are provided on the drum assembly 2. The photosensitive drum 21 receives the developer provided by the developing box 1 and forms an electrostatic latent image. The first force applying portion 221 and the second force applying portion 222 are used to apply a pushing force to the developing box 1.

[0045] The developing box 1 includes a box body 10, a developing assembly, a transmission assembly, a separation assembly and a pushing assembly.

[0046] like Figure 1As shown, the cartridge body 10 has a chamber for accommodating developer. The cartridge body 10 has a first end 11 and a second end 12 oppositely disposed in a first direction, a third end 13 and a fourth end 14 oppositely disposed in a second direction, and a fifth end 15 and a sixth end oppositely disposed in a third direction. The first, second, and third directions intersect and are further perpendicular to each other. The fifth end 15 is provided with a friction portion 151 having a plurality of ribs extending in the first direction. The friction portion 151 is configured to facilitate user handling of the developer cartridge 1. A transmission assembly is located at the first end 11 of the cartridge body 10 and is configured to receive power output by the image forming device to drive the developing assembly within the developer cartridge 1. A first protective cover 111 is removably fixedly mounted to the first end 11 of the cartridge body 10. The first protective cover 111 at least partially covers the transmission assembly and protects the transmission assembly.

[0047] like Figure 1 As shown, the developer box 1 includes an identification component, which is located at the first end 11 of the box body 10. In this embodiment, the identification component is specifically a storage medium 113. The storage medium 113 is used to store information of the developer box 1. When the developer box 1 is installed in the image forming device, the information is transmitted to the image forming device so that the developer box 1 is recognized by the image forming device. The storage medium 113 also includes an electrical contact surface electrically connected thereto. The storage medium 113 and the electrical contact surface can be formed integrally or can be electrically connected separately through an intermediate component. A bracket 112 is also provided at the first end 11. The bracket 112 can move relative to the box body 10. The storage medium 113 is mounted on the bracket 112 and can move relative to the box body 10 following the bracket 112. In some embodiments, the storage medium 113 can be directly mounted on the first protective cover 111 or the box body 10, or the bracket 112 and the storage medium 113 cannot move relative to the box body 10.

[0048] like Figure 1 and Figure 2As shown, the developing assembly includes a developing roller 131, a stirring frame 133, and a powder feed roller (not shown). These rollers are rotatably mounted within a housing chamber between the first end 11 and the second end 12. The rotational axes of the developing roller 131, stirring frame, and powder feed roller all extend in a first direction. The powder feed roller is positioned adjacent to the developing roller 131, and in a second direction, the developing roller 131 is closer to the third end 13 of the housing 10 than the powder feed roller. The stirring frame 133 stirs the developer within the developing chamber, creating friction and preventing clumping. The developing roller 131 is configured to contact the photosensitive drum 21 of the drum assembly 2 to transfer developer to the drum 21. The developing assembly also includes a powder knife 132, positioned adjacent to the developing roller 131 and extending in the first direction. The knife 132 is configured to contact the developing roller 131 to control the thickness of the developer layer on the developing roller 131.

[0049] like Figure 2 As shown, the transmission assembly is arranged at the first end 11 of the box body 10, and the transmission assembly includes a driving part 40. The driving part 40 includes a power receiving part and a driving gear, and the two can be integrally formed or combined. In the first direction, the driving gear is closer to the first end 11 than the power receiving part. The power receiving part is exposed through the through hole of the first protective cover 111, and the power receiving part is used to receive the power output by the image forming device, thereby rotating the driving part 40. In this embodiment, the driving part 40 rotates coaxially with the stirring frame 133, that is, the rotation axes of the two overlap, and the driving part 40 provides rotational power for the stirring frame 133. By driving the stirring frame 133 by the driving part 40, the structure of the developing box can be simplified. In some embodiments, the rotation axis of the stirring frame 133 can be farther away from the developing roller 131 than the rotation axis of the driving part 40.

[0050] The transmission assembly also includes a developing gear 41, a powder feeding gear 42 and a first idler gear 43. The powder feeding gear 42 is engaged with the driving gear to receive power and rotate. The first idler gear 43 is engaged with the powder feeding gear 42 and the developing gear 41 at the same time to receive power and transmit the power to the developing gear 41. The developing gear 41 is mounted on the end of the developing roller 131 located at the first end 11 and drives the developing roller 131 to rotate when receiving power. The powder feeding gear 42 is mounted on the end of the powder feeding roller located at the first end 11 and drives the powder feeding roller to rotate when receiving power. In some embodiments, a stirring gear can be provided to provide power to the stirring frame 133. This embodiment does not limit the number of gears and the meshing relationship of the transmission assembly, and can be set according to actual needs.

[0051] like Figure 1 and Figure 3As shown, the separation assembly is used to receive a separation force output from the image forming apparatus to disengage the developing roller 131 from the photosensitive drum 21. The separation assembly includes a first separation member 114 and a second separation member 122. The first separation member 114 is located at the first end 11. It is abutted by components on the drum assembly 2 to receive the separation force and enable the cartridge body 10 to drive one end of the developing roller 131 away from the photosensitive drum 21 in a first direction. The second separation member 122 is located at the second end 12. It is abutted by a separation cam within the image forming apparatus to receive the separation force and enable the cartridge body 10 to drive the other end of the developing roller 131 away from the photosensitive drum 21. A second protective cover 121 is also provided at the second end 12 to prevent the second separation member 112 from disengaging. In some embodiments, the separation assembly may be abutted only by the drum assembly or only by the separation cam, or a separation member may be provided only at the first end 11 or the second end 12.

[0052] The developing cartridge 1 further includes electrodes (not shown) for receiving a voltage outputted from the image forming apparatus and transmitting the voltage to the developing roller 131 and the powder feeding roller, so that the developing roller 131 and the powder feeding roller are charged to absorb the developer.

[0053] like Figure 2-Figure 4 As shown, a first mounting portion 115 is provided at the first end 11 of the housing 10. The first mounting portion 115 is generally in the shape of a guide rail extending in the second direction and has a through hole in the third direction. The first mounting portion 115 also includes a connecting post 116 that protrudes in the first direction. A second mounting portion 123 is provided at the second end 12. The second mounting portion 123 is in the shape of a groove and extends toward the distal developing roller 131.

[0054] See Figure 4 The pushing assembly includes a first pushing member 31 and a second pushing member 33. The first pushing member 31 is provided at the first end 11 and is movably mounted on the first mounting portion 115. The first pushing member 31 includes a first pushing portion 311 and a supported portion 312. The two can be formed integrally or in a separate combination. The supported portion 312 is supported by the first mounting portion 115. The supported portion 312 allows the first pushing member 31 to slide relative to the box body 10 along the second direction. A hole-shaped or columnar connecting portion is provided on the supported portion 312. The first pushing portion 311 is formed by bending downward and extending on the supported portion 312. When the developer cartridge 1 is mounted on the drum assembly 2, the first pushing portion 311 is used to receive the pushing force applied by the first force-applying portion 221 of the drum assembly 2. Furthermore, the first pushing portion 311 is on a side facing away from the developing roller 131 in the second direction (see FIG. 2 ). Figure 3 ) is abutted by the first force applying portion 221 and receives the forced thrust (see Figure 6The pushing assembly further includes a first elastic member 32 provided at the first end. The first elastic member 32 is preferably a tension spring, and in other embodiments may be other elastic media such as sponge. One end of the first elastic member 32 is connected to the connecting column 116, and the other end is connected to the connecting portion on the first pushing member 31. When the first pushing member 31 receives the pushing force applied by the first force applying portion 221 and moves in the second direction toward the photosensitive drum 21, the first elastic member 31 is stretched following the movement of the first pushing member 31 (see Figure 6 ), the first elastic member 31 generates elastic deformation and transmits the elastic force to the box body 10, so that the box body 10 has a tendency to approach the photosensitive drum 21, thereby making one end of the developing roller 131 in the first direction in close contact with the photosensitive drum 21.

[0055] See Figure 2 , viewed along the third direction, that is, in the second direction, the driving portion 40 and the first pushing member 31 at least partially overlap, as shown in the figure, Figure 2 The frontmost dashed line A1 of the driving unit 40 and the rearmost dashed line A2 of the driving unit 40 are shown. The dashed lines A1 and A2 extend in the vertical direction. The first pushing member 31 is at least partially located between the frontmost dashed line A1 and the rearmost dashed line A2. Furthermore, the rotation axis of the driving unit 40 at least partially overlaps with the first pushing member 31, that is, as shown in the figure, Figure 2 A dashed line A0 is shown passing through the rotation axis of the driving portion 40. The dashed line A0 extends in the vertical direction, with the middle dashed line A0 passing through the first urging member 31. When viewed along a third direction, i.e., the second direction, the driving portion 40 at least partially overlaps with the first urging member 31. Alternatively, the rotation axis of the driving portion 40 at least partially overlaps with the first urging member 31, allowing the first urging member to be closer to the developing roller, thereby more stably transmitting the urging force to the developing roller. This also reduces shaking of the first urging member during operation of the developing cartridge, ensuring stable transmission of the urging force.

[0056] In other embodiments, it may also be that: when viewed along the third direction, that is, in the second direction, the driving portion and the second pushing member at least partially overlap, and further, when viewed along the third direction, that is, in the second direction, the rotation axis of the driving portion and the second pushing member at least partially overlap.

[0057] The second pushing member 33 is provided at the second end 12 and is movably mounted on the second mounting portion 123. The second pushing member 33 can move relative to the box body 10. The second pushing member 33 is provided with a second pushing portion 331. The second pushing portion 331 is an end of the second pushing member 33 away from the developing roller 131 in the second direction (see FIG. Figure 4), when the developing cartridge 1 is mounted on the drum assembly 2, the second pushing portion 331 is used to receive the pushing force applied by the second force applying portion 222 of the drum assembly 2, and further, the end surface of the second pushing portion 331 is abutted by the first force applying portion 221 to receive the pushing force (see Figure 7 ), the pushing assembly further includes a second elastic member 34 disposed at the second end 12. The second elastic member 34 is located within the second mounting portion 123, and between the inner wall of the second mounting portion 123 and the second pushing member 33. The second elastic member 34 is preferably a compression spring, and in other embodiments, may be other elastic media such as sponge. When the second pushing member 33 receives the pushing force applied by the second force-applying portion 222, the second pushing member 33 moves toward the direction approaching the photosensitive drum 21, the second elastic member 34 is compressed, and the second elastic member 34 undergoes elastic deformation, transmitting the elastic force to the cartridge body 10, causing the cartridge body 10 to have a tendency to approach the photosensitive drum 21, thereby causing the other end of the developing roller 131 in the first direction to be in close contact with the photosensitive drum 21. It can be seen that, in this embodiment, the first forced pushing portion 311 and the second forced pushing portion 331 do not overlap at least partially in the first direction and have different structures. Furthermore, in the second direction, the first forced pushing portion 311 is closer to the developing roller 131 than the second forced pushing portion 312. In other embodiments, it may also be that, in the second direction, the first forced pushing portion 311 is farther away from the developing roller 131 than the second forced pushing portion 312.

[0058] In other embodiments, it can also be arranged that the first elastic member is compressed when the first pushing portion receives the pushing force, that is, the first elastic member is a compression spring, and the second elastic member is stretched when the second pushing portion receives the pushing force, that is, the second elastic member is a tension spring.

[0059] In some embodiments, in the second direction, the first urging portion and the second urging portion are located between the electrical contact surface and the rotation axis of the developer roller. In the second direction, the distance between the first urging portion and the electrical contact surface is a first distance, and the distance between the first urging portion and the rotation axis of the developer roller is a second distance, where the first distance is greater than the second distance. In the second direction, the distance between the second urging portion and the electrical contact surface is a third distance, and the distance between the first urging portion and the rotation axis of the developer roller is a fourth distance, where the third distance is less than the fourth distance.

[0060] In some embodiments, the first forced pushing portion 311 can be integrally formed on the first elastic member 31 (that is, the first forced pushing portion 311 can be a part of the first elastic member 32, that is, the first forced pushing portion 311 is formed on the first elastic member 32, specifically, the first forced pushing portion 311 is the end portion of the first elastic member 32), that is, the first elastic member 31 directly abuts against the first force-applying portion 221, and the second forced pushing portion 312 can be integrally formed on the second elastic member 34 (that is, the second forced pushing portion 331 can be a part of the second elastic member 34, that is, the second forced pushing portion 331 is formed on the second elastic member 34, specifically, the second forced pushing portion 331 is the end portion of the second elastic member 34), that is, the second elastic member 34 directly abuts against the second force-applying portion 312.

[0061] Example 2:

[0062] Unless otherwise specified, the structure of the developing cartridge in this embodiment is the same as that in embodiment 1. The main difference between this embodiment and embodiment 1 is that the forced pushing assembly in this embodiment is further away from the fourth end 14 than the forced pushing assembly in embodiment 1.

[0063] like Figure 8 and Figure 9 As shown, the first end 11 of the box body 10 is provided with a first mounting portion 117 and a second mounting portion 1211 . The first mounting portion 117 is preferably provided in a groove on the first protective cover 111 , and the second mounting portion 1211 is preferably provided in a groove on the second protective cover 121 .

[0064] See Figure 8 The pushing assembly includes a first pushing member 35 and a second pushing member 37. The pushing assembly is disposed adjacent to the developing roller 131 and is located above the developing roller 131 in the third direction. The first pushing member 35 and the second pushing member 37 are both hook-shaped. The first pushing member 35 is movably mounted on the first mounting portion 117. In this embodiment, the first pushing portion is specifically implemented as a first connecting portion 351. The first connecting portion 351 is a hook portion bent rightward in the first direction. The first connecting portion 351 is provided with a first inclined surface 3511 extending in a direction intersecting the first direction. A first elastic member 36 is disposed between the first pushing member 35 and the first mounting portion 117, connecting the first mounting portion 117 and the first pushing member 35. In this embodiment, the second forced pushing portion is specifically implemented as a second connecting portion 371. The second connecting portion 371 is a hook portion bent leftward in the first direction. The second connecting portion 371 is provided with a second inclined surface 3711 extending in a direction intersecting the first direction. A second elastic member 38 is provided between the second forced pushing member 37 and the second mounting portion 1211. The second elastic member 38 connects the second forced pushing member 37 and the second mounting portion 1211. In this embodiment, the first elastic member 36 and the second elastic member 38 are preferably tension springs. In other embodiments, they may be other elastic media such as sponge.

[0065] See Figure 9 The drum assembly 2 is provided with a third connecting portion 231 and a fourth connecting portion 232 adjacent to the photosensitive drum 21. Both the third connecting portion 231 and the fourth connecting portion 232 are groove-shaped. When the developer cartridge 1 is installed on the drum assembly 2, the first connecting portion 351 is inserted into the third connecting portion 231. During installation, the first inclined surface 3511 avoids the third connecting portion 231 to facilitate smooth insertion of the first connecting portion 351. The second connecting portion 371 is inserted into the fourth connecting portion 232. During installation, the second inclined surface 371 avoids the fourth connecting portion 232 to facilitate smooth insertion of the second connecting portion 371. At this time, the first elastic member 36 and the second elastic member 38 are in a stretched state. The first elastic member 36 and the second elastic member 38 exert an elastic force on the cartridge body 10 in a direction toward the photosensitive drum, causing the cartridge body 10 to have a tendency to move toward the photosensitive drum 21, thereby ensuring close contact between the developing roller 131 and the photosensitive drum 21.

[0066] Example 3:

[0067] Unless otherwise specified, the structure of the developing cartridge in this embodiment is the same as that in embodiment 1. The main difference between this embodiment and embodiment 1 is the structure of the transmission assembly in this embodiment.

[0068] like Figure 10 As shown, the transmission assembly includes a drive unit 40, a developing gear 41, a powder feeding gear 42, and a first idler gear 43. In this embodiment, the powder feeding gear 42 does not mesh with the first idler gear 43. The transmission assembly also includes a second idler gear 44 and a stirring gear 45. The second idler gear 44 meshes with both the drive unit 40 and the stirring gear 45 to transmit power to the stirring gear 45. The stirring gear 45 is fixedly mounted on one end of the stirring frame 133 located at the first end 11, and the stirring gear 45 drives the stirring frame 133 to rotate.

[0069] The transmission assembly further includes a third idler gear 46, which is meshed with the driving unit 40 and the first idler gear 43 to transmit power, thereby causing the first idler gear 43 to transmit power to the developing gear 41, thereby rotating the developing roller 131. The third idler gear 46 preferably rotates coaxially with the powder feed gear 42, but no power is transmitted therebetween. Furthermore, the third idler gear 46 is rotatably supported by the powder feed roller 134 or the powder feed gear 42.

[0070] The powder feeding gear 42 meshes with the driving unit 40, thereby receiving power to drive the powder feeding roller 134 to rotate. Because the powder feeding gear 42 drives the powder feeding roller 134 to rotate, and because the powder feeding roller 134 generates a certain amount of friction when rotating within the cartridge body 10, this friction will affect the powder feeding gear 42 to a certain extent, thereby affecting the powder feeding gear 42's ability to transmit power to the developing gear 41. Therefore, in this embodiment, a third idler gear 46 is provided to transmit power to the developing gear. During the power transmission process, the third idler gear 46 is free of unnecessary obstruction, allowing the developing gear 41 to more stably receive power and drive the developing roller 131 to rotate, thereby enabling the developing roller 131 to stably transfer developer to the photosensitive drum 21.

[0071] In other embodiments, the third idler gear 46 and the powder feeding gear 42 do not rotate on the same axis and have different diameters. The third idler gear 46 is rotatably supported by a cylinder extending along the first direction on the first protective cover 111 .

[0072] In summary, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of the present application. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present application. The technical scope of the present application is not limited to the contents of the specification. All so-called equivalent changes and modifications of the shape, structure, characteristics and spirit described in the scope of the claims of the present application should be included in the scope of the claims of the present application.

Claims

1. A developing cartridge, which can be detachably combined with a drum assembly and can be detachably mounted on an image forming device, wherein the drum assembly includes a photosensitive drum, characterized in that: The developing box includes: a box body for storing developer, the box body having a first end and a second end opposite to each other in a first direction, and a third end and a fourth end opposite to each other in a second direction; a developing roller rotatably disposed on the box body around a first direction; a driving portion, configured to receive a driving force from the image forming device and rotate, the driving portion being disposed at the first end; an electrical contact surface, disposed at the first end of the box body; and a pushing assembly for receiving a pushing force from the drum assembly so that the developing roller and the photosensitive drum come into contact with each other, the pushing assembly comprising a first pushing member movably disposed at the first end and a second pushing member movably disposed at the second end; the first pushing member comprising a first pushing portion for receiving the pushing force, and the second pushing member comprising a second pushing portion for receiving the pushing force; The forced pushing assembly further includes a first elastic member and a second elastic member; The first elastic member is configured to deform when the first urging portion receives the urging force and moves, thereby causing the developing roller to contact the photosensitive drum; The second elastic member is configured to deform when the second urging portion receives the urging force and moves, thereby bringing the developing roller into contact with the photosensitive drum.

2. The developing cartridge according to claim 1, wherein When viewed along a third direction intersecting the first direction and the second direction, at least one of the first urging member and the second urging member at least partially overlaps with the driving portion.

3. The developing cartridge according to claim 1, wherein The first elastic member is configured to be stretched when the first pushing portion receives a pushing force, and the second elastic member is configured to be compressed when the second pushing portion receives a pushing force, or the first elastic member is configured to be compressed when the first pushing portion receives a pushing force, and the second elastic member is configured to be stretched when the second pushing portion receives a pushing force.

4. The developing cartridge according to claim 2, wherein: The first forced pushing portion and the second forced pushing portion have different structures; In the second direction, the first urging portion is closer to the developing roller than the second urging portion, or the first urging portion is farther away from the developing roller than the second urging portion.

5. The developing cartridge according to claim 1, wherein When viewed along a third direction intersecting the first direction and the second direction, the rotation axis of the drive portion at least partially overlaps with the first pushing member, and / or, when viewed along the third direction, the rotation axis of the drive portion at least partially overlaps with the second pushing member.

6. The developing cartridge according to claim 1, wherein: In the second direction, the first forced pushing portion and the second forced pushing portion are located between the electrical contact surface and the rotation axis of the developing roller; in the second direction, the distance between the first forced pushing portion and the electrical contact surface is a first distance, and the distance between the first forced pushing portion and the rotation axis of the developing roller is a second distance, and the first distance is greater than the second distance; in the second direction, the distance between the second forced pushing portion and the electrical contact surface is a third distance, and the distance between the first forced pushing portion and the rotation axis of the developing roller is a fourth distance, and the third distance is less than the fourth distance.

7. The developing cartridge according to claim 1, wherein: The first forced pushing portion is a first connecting portion, the second forced pushing portion is a second connecting portion, and the drum assembly is provided with a third connecting portion and a fourth connecting portion; When the developing box is installed on the drum assembly, the first connecting part cooperates with the third connecting part to lock the first elastic part, so that the first elastic part is deformed, thereby making the developing roller and the photosensitive drum contact each other, and the second connecting part cooperates with the fourth connecting part to lock the second elastic part to deform the developing roller and the photosensitive drum contact each other.

8. The developing cartridge according to claim 7, wherein: The first connecting portion and the second connecting portion are hooks, and the third connecting portion and the fourth connecting portion are grooves; The first elastic member and the second elastic member are configured to be stretched when the first connecting portion and the second connecting portion are engaged with the third connecting portion and the fourth connecting portion, respectively.

9. The developing cartridge according to claim 8, wherein: A first inclined surface is provided on the first connecting part, and a second inclined surface is provided on the second connecting part; during the process of installing the developing box to the drum assembly, the first inclined surface is used to make the first connecting part avoid the third connecting part and then insert into the third connecting part, and the second inclined surface is used to make the second connecting part avoid the fourth connecting part and then insert into the fourth connecting part.

10. The developing cartridge according to any one of claims 1 to 9, wherein: The developing box further includes a stirring frame, and the driving part is coaxially arranged with the stirring frame and drives the stirring frame to rotate.

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