Developing box

Abstract

The embodiment of the utility model provides a developing box. The developing box comprises a box body, a driven gear and a transmission assembly, and a part of area of the box body protrudes to form a supporting column. And the driven gear is rotatably arranged on the box body. The transmission assembly comprises a coupler, one end of the coupler is provided with a supporting hole, and the other end of the coupler is provided with a driving force receiving hole. The coupler is rotatably installed on the supporting column through the supporting hole, and the peripheral face of the coupler is in meshing transmission with the driven gear. On the plane perpendicular to the axial direction of the coupler, the projection of the driving force receiving hole is located in the projection range of the supporting hole. The developing box disclosed by the embodiment of the utility model is relatively high in structural strength.

Description

Technical Field

[0001] This application relates to the field of electrophotographic imaging technology, and particularly relates to a developing cartridge. Background Art

[0002] In related technologies, developing cartridges are widely used in electrophotographic imaging devices such as laser printers, copiers, and fax machines. Generally, a developing cartridge includes a coupling. During the imaging process, the coupling receives a rotational driving force from the electrophotographic imaging device to drive the rotation of other structures of the developing cartridge.

[0003] However, the structural strength at the mating part between the coupling in related technologies and the cartridge body of the developing cartridge is insufficient, resulting in easy bending or breaking at the docking position between the cartridge body and the coupling, thereby causing the developing cartridge to malfunction. Utility Model Content

[0004] In view of this, the main purpose of the embodiments of this application is to provide a developing cartridge with relatively high structural strength.

[0005] To achieve the above object, the technical solution of the embodiments of this application is realized as follows:

[0006] The embodiments of this application provide a developing cartridge, including:

[0007] A cartridge body, with a partial area of the cartridge body protruding to form a support column;

[0008] A driven gear, rotatably arranged on the cartridge body;

[0009] A transmission assembly, the transmission assembly includes a coupling. One end of the coupling has a support hole, and the other end has a driving force receiving hole; the coupling is rotatably installed on the support column through the support hole, and the outer peripheral surface of the coupling meshes with the driven gear for transmission;

[0010] In a plane perpendicular to the axial direction of the coupling, the projection of the driving force receiving hole is located within the projection range of the support hole.

[0011] In one implementation, the coupling includes a support end with the support hole and a receiving end with the driving force receiving hole. The outer peripheral surface of the support end is formed with a transmission gear that meshes with the driven gear for transmission.

[0012] In one implementation, in a plane perpendicular to the axial direction of the coupling, the projection of the transmission gear is located outside the projection range of the support hole and extends circumferentially around the projection of the support hole.

[0013] In one embodiment, the support end includes a support body having the support hole, and the transmission gear extending circumferentially around the outer periphery of the support body. A first end hole is formed by a gap between the transmission gear and a partial area of the support body.

[0014] In one embodiment, the support end has a plurality of the first end holes, and the first end holes are circumferentially spaced apart around the outer periphery of the support body.

[0015] In one embodiment, a partial area of the hole wall of the driving force receiving hole protrudes into the driving force receiving hole to form a protruding portion, and a partial area of the protruding portion is recessed to form a second end hole extending along the axial direction of the coupling.

[0016] In one embodiment, the support end includes a support body having the support hole, and the transmission gear extending circumferentially around the outer periphery of the support body. A first end hole is formed by a gap between the transmission gear and a partial area of the support body.

[0017] Axially along the coupling, one end where the first end hole and the second end hole are close to each other is closed, so as to separate the first end hole and the second end hole; and / or,

[0018] Axially along the coupling, the first end hole and the second end hole are arranged in a staggered manner; and / or,

[0019] Axially along the coupling, one end where the first end hole and the second end hole face away from each other is open.

[0020] In one embodiment, a plurality of the protruding portions are formed on the hole wall of the driving force receiving hole, and the protruding portions are circumferentially spaced apart around the inner periphery of the driving force receiving hole; and / or,

[0021] The protruding portion has a plurality of the second end holes, and at least one of the second end holes is a square hole or a waist-shaped hole.

[0022] In one embodiment, the coupling includes a partition substrate located between the support hole and the driving force receiving hole;

[0023] The partition substrate has a mold alignment hole formed therethrough, and the mold alignment hole communicates with the support hole and the driving force receiving hole respectively; and / or,

[0024] A partial area of the end face of the partition substrate close to the support hole side is recessed to form a third end hole, and one end of the third end hole close to the driving force receiving hole is closed.

[0025] In one embodiment, the developing cartridge includes a developing roller disposed on the cartridge body. The driven gear includes a developing roller gear, and the developing roller is connected to the developing roller gear. The outer peripheral surface of the coupling is meshed with the developing roller gear for transmission, and the tooth number ratio of the outer peripheral surface of the coupling to the developing roller gear is greater than or equal to 1.5 and less than or equal to 3; and / or,

[0026] The driven gear includes a powder feeding roller gear, the outer peripheral surface of the coupling is meshed with the powder feeding roller gear for transmission, and the tooth number ratio of the outer peripheral surface of the coupling to the powder feeding roller gear is greater than or equal to 1.5 and less than or equal to 3.

[0027] An embodiment of the present application provides a developing cartridge. A partial area of the cartridge body of the developing cartridge protrudes to form a support column. One end of the coupling of the transmission assembly has a support hole, and the other end has a driving force receiving hole. The coupling is rotatably mounted on the support column through the support hole. In a plane perpendicular to the axial direction of the coupling, the projection of the driving force receiving hole is located within the projection range of the support hole. Thus, the problem that the strength of the support column is insufficient due to the over-large aperture of the driving force receiving hole and the over-small aperture of the support hole can be prevented, and further, the problem that the connection between the coupling and the cartridge body is prone to bending or breaking due to the insufficient strength of the support column can be avoided. That is to say, by controlling the projection of the driving force receiving hole within the projection range of the support hole, the present application can preferably increase the aperture of the support hole, so that the support column matched with the support hole can be thickened, and further, the strength of the support column can be increased, and the overall structural strength and stability of the developing cartridge can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a developing cartridge according to an embodiment of the present application;

[0029] Figure 2 is Figure 1 an exploded view of the developing cartridge in

[0030] Figure 3 is Figure 2 a partial enlarged view of part A in

[0031] Figure 4 is Figure 3 a side view of the developing cartridge in

[0032] Figure 5 is Figure 2 a schematic structural diagram of the coupling in

[0033] Figure 6 is Figure 5 a schematic structural diagram of the coupling from another perspective in

[0034] Figure 7 is Figure 5Front view of the coupling;

[0035] Figure 8 is Figure 7 side view of;

[0036] Figure 9 is Figure 7 rear view of;

[0037] Figure 10 is Figure 9 sectional view taken along line B - B in;

[0038] Figure 11 is Figure 9 structural schematic diagram of the coupling after rotating a certain angle;

[0039] Figure 12 is Figure 11 sectional view taken along line C - C in;

[0040] Figure 13 is Figure 11 structural schematic diagram of the coupling after rotating a certain angle;

[0041] Figure 14 is Figure 13 sectional view taken along line D - D in;

[0042] Figure 15 is Figure 13 structural schematic diagram of the coupling after rotating a certain angle;

[0043] Figure 16 is Figure 15 sectional view taken along line E - E in.

[0044] Explanation of reference numerals

[0045] 10. Box body; 11. Support column; 20. Driven gear; 21. Developing roller gear; 22. Powder feeding roller gear; 23. Intermediate gear; 30. Transmission assembly; 31. Coupling; 31a. Support hole; 31b. Driving force receiving hole; 311. Support end; 311a. First end hole; 3111. Support main body; 3112. Transmission gear; 312. Receiving end; 313. Protrusion; 313a. Second end hole; 314. Partition substrate; 314a. Mold alignment hole; 314b. Third end hole; 40. Developing roller; 50. Cover; 60. Stirring gear; 70. Counting gear. Detailed implementation manners

[0046] In this application, the "axial" orientation or positional relationship is based on the attached Figure 10The orientation or positional relationship shown. It should be understood that these orientation terms are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0047] An embodiment of the present application provides a developing cartridge. Please refer to Figure 1 and Figure 2 , the developing cartridge includes a cartridge body 10, a driven gear 20, and a transmission assembly 30.

[0048] Please refer to Figure 3 , a partial area of the cartridge body 10 protrudes to form a support post 11.

[0049] Please refer to Figure 4 , the driven gear 20 is rotatably arranged on the cartridge body 10.

[0050] Please refer to Figure 5 and Figure 6 , the transmission assembly 30 includes a coupling 31. One end of the coupling 31 has a support hole 31a, and the other end has a driving force receiving hole 31b. The coupling 31 is rotatably mounted on the support post 11 through the support hole 31a, and the outer peripheral surface of the coupling 31 meshes with the driven gear 20 for transmission.

[0051] Please refer to Figure 10 , in a plane perpendicular to the axis of the coupling 31, the projection of the driving force receiving hole 31b is located within the projection range of the support hole 31a.

[0052] Specifically, the driving force receiving hole 31b of the transmission assembly 30 is used to cooperate with a driving structure to receive the driving force from the driving structure. For example, the driving force receiving hole 31b is used to cooperate with an electrophotographic imaging device or a printer, etc., to receive the rotational driving force from the electrophotographic imaging device or the printer, so that the coupling 31 rotates.

[0053] The driven gear 20 is used to mesh with the coupling 31 to achieve transmission. It should be noted that the driven gear 20 can cooperate with any structure.

[0054] For example, please refer to Figure 3 , the developing cartridge includes a developing roller 40 arranged on the cartridge body 10. The driven gear 20 includes a developing roller gear 21. The developing roller 40 is connected to the developing roller gear 21, and the outer peripheral surface of the coupling 31 meshes with the developing roller gear 21 for transmission. Thus, the developing roller gear 21 can transmit the driving force received by the coupling 31 to the developing roller 40, so that the developing roller 40 rotates.

[0055] Another example, please refer to Figure 3The driven gear 20 includes a powder feeding roller gear 22, and the outer peripheral surface of the coupling 31 is meshed with the powder feeding roller gear 22. Thus, the powder feeding roller gear 22 can transmit the driving force received by the coupling 31 to the powder feeding roller, thereby causing the powder feeding roller to rotate.

[0056] For example, see Figure 3 The driven gear 20 may also be an intermediate gear 23, and the developing box includes at least one of the stirring gear 60 and the counting gear 70. Thus, the stirring gear 60 and / or the counting gear 70 may be driven to rotate synchronously through the transmission of the intermediate gear 23.

[0057] Of course, it should be noted that the driven gear 20 may include only any one of the above gear structures, or may be a combination of the above gear structures. For example, the driven gear 20 includes a developing roller gear 21, a powder feeding roller gear 22, and an intermediate gear 23, and the developing roller gear 21, the powder feeding roller gear 22, and the intermediate gear 23 are respectively meshed with the outer peripheral surface of the coupling 31 for transmission.

[0058] One end of the coupling 31 away from the driving force receiving hole 31b has a support hole 31a, and the support hole 31a is used for the coupling 31 to be installed on the support column 11. It can be understood that the support column 11 is inserted into the support hole 31a to support the coupling 31 while allowing the coupling 31 to rotate on the support column 11.

[0059] The structural shape of the support column 11 corresponds to that of the support hole 31 a , and the outer dimensions of the support column 11 are limited by the aperture size of the support hole 31 a . Therefore, when the size of the support hole 31 a increases, the outer dimensions of the support column 11 can also be designed to be larger.

[0060] The specific position of the support column 11 can be set according to actual conditions. For example, the support column 11 is located on the outer surface of the box body 10.

[0061] On a plane perpendicular to the axial direction of the coupling 31, the projection of the driving force receiving hole 31b is located within the projection range of the supporting hole 31a. In other words, the size of the driving force receiving hole 31b is less than or equal to the size of the supporting hole 31a, so from the perspective of projection, the projection range of the driving force receiving hole 31b is located within the projection range of the supporting hole 31a. In this way, the size of the supporting hole 31a can be made large enough. Compared with the design method in which the driving force receiving hole 31b is larger than the supporting hole 31a, the support hole 31a of the present application is more stable in cooperation with the supporting column 11, the supporting column 11 can be made larger, the strength can be higher, and the supporting column 11 is not easy to bend or break.

[0062] It can be seen that in the cartridge body 10 of the developing cartridge according to the embodiment of the present application, a portion of the area protrudes to form a support post 11. One end of the coupling 31 of the transmission assembly 30 has a support hole 31a, and the other end has a driving force receiving hole 31b. The coupling 31 is rotatably mounted on the support post 11 through the support hole 31a. In a plane perpendicular to the axial direction of the coupling 31, the projection of the driving force receiving hole 31b is located within the projection range of the support hole 31a. Thus, it is possible to prevent the problem that the strength of the support post 11 is insufficient due to the excessively large aperture of the driving force receiving hole 31b and the excessively small aperture of the support hole 31a, and further avoid the problem that the connection between the coupling 31 and the cartridge body 10 is prone to bending or breaking due to the insufficient strength of the support post 11. That is to say, by controlling the projection of the driving force receiving hole 31b within the projection range of the support hole 31a, the present application can preferably increase the aperture of the support hole 31a, so that the support post 11 matching the support hole 31a can be thickened, and further improve the strength of the support post 11, thereby improving the overall structural strength and stability of the developing cartridge.

[0063] In one embodiment, please refer to Figures 5 to 8 , the coupling 31 includes a support end 311 having a support hole 31a and a receiving end 312 having a driving force receiving hole 31b. A transmission gear 3112 engaged with the driven gear 20 is formed on the outer peripheral surface of the support end 311.

[0064] Specifically, the end of the coupling 31 having the support hole 31a is the support end 311, and the end of the coupling 31 having the driving force receiving hole 31b is the receiving end 312. The coupling 31 is driven by the transmission gear 3112 located on the outer peripheral surface and engaged with the driven gear 20.

[0065] The transmission gear 3112 is located on the outer peripheral surface of the support end 311, which can make the transmission more stable and at the same time make the coupling 31 and the support post 11 not easily break.

[0066] It should be noted that the support end 311 and the receiving end 312 can be integrally formed. According to the actual situation, the support end 311 and the receiving end 312 can also be formed in a split manner.

[0067] In other embodiments, the transmission gear 3112 can also be located on the outer peripheral surface of the receiving end 312.

[0068] In one embodiment, please refer to Figures 5 to 8 , in a plane perpendicular to the axial direction of the coupling 31, the projection of the transmission gear 3112 is located outside the projection range of the support hole 31a and extends circumferentially around the projection of the support hole 31a.

[0069] That is to say, on a plane parallel to the radial direction of the coupling 31, the projections of all regions of the transmission gear 3112 are located outside the projection ranges of all regions of the support hole 31a. Thereby, the transmission can be made more stable, and at the same time, the structural stability of the support column 11 can be further improved.

[0070] In one embodiment, please refer to Figure 5 and Figure 7 , the support end 311 includes a support body 3111 having a support hole 31a, and a transmission gear 3112 extending circumferentially around the outer periphery of the support body 3111. The transmission gear 3112 is spaced apart from a partial region of the support body 3111 to form a first end hole 311a. Thereby, the wall thickness of the support end 311 can be made as uniform as possible, the risk of shrinkage can be reduced, and the firmness of the coupling 31 can be enhanced.

[0071] Specifically, the support end 311 includes a support body 3111 and a transmission gear 3112, and the transmission gear 3112 is arranged circumferentially around the outer periphery of the support body 3111. Among them, the support body 3111 and the transmission gear 3112 can be an integrally formed structure or a separately formed structure.

[0072] The transmission gear 3112 is spaced apart from a partial region of the support body 3111 to form a first end hole 311a at the spaced position. In fact, the first end hole 311a is located on the circumferential side of the support hole 31a and can play a role in thinning the wall thickness.

[0073] One side of the first end hole 311a facing away from the receiving end 312 can be open, thereby facilitating processing and manufacturing.

[0074] It should be noted that the shape and number of the first end holes 311a are not limited. For example, the support end 311 has one first end hole 311a, and the first end hole 311a is an annular hole. Another example is that the first end hole 311a has multiple first end holes 311a, and the first end hole 311a is an arc-shaped hole.

[0075] Exemplarily, please refer to Figure 5 and Figure 7 , the support end 311 has multiple first end holes 311a, and each first end hole 311a is arranged circumferentially and spaced apart around the outer periphery of the support body 3111. That is to say, the first end holes 311a are spaced apart from each other, thereby uniformly reducing the wall thickness. At the same time, compared with the setting method using an annular hole, it can achieve the purpose of strengthening the structural strength to a certain extent.

[0076] In one embodiment, please refer to Figures 9 to 16, a partial area of the hole wall of the driving force receiving hole 31b protrudes into the driving force receiving hole 31b to form a protruding portion 313, and a partial area of the protruding portion 313 is recessed to form a second end hole 313a extending along the axial direction of the coupling 31. Thereby, the wall thickness at the end of the driving force receiving hole 31b of the coupling 31 can be made as uniform as possible, the risk of shrinkage can be reduced, and the firmness of the coupling 31 can be enhanced.

[0077] Specifically, the driving force receiving hole 31b is used to cooperate with a driving structure to receive the driving force from the driving structure. Generally, a round hole design is not adopted for the driving force receiving hole 31b. Therefore, a protruding portion 313 that protrudes into the driving force receiving hole 31b is formed on the hole wall of the driving force receiving hole 31b to match the outer shape of the driving portion of the driving structure.

[0078] By forming the second end hole 313a on the protruding portion 313, the wall thickness can be reduced as much as possible while not destroying the driving cooperation between the protruding portion 313 and the driving structure.

[0079] The side of the second end hole 313a facing away from the support hole 31a can be open. Thereby, it is convenient for processing and manufacturing.

[0080] It should be noted that the shape and number of the second end holes 313a are not limited.

[0081] Exemplarily, please refer to Figures 9 to 16 , the protruding portion 313 has a plurality of second end holes 313a, and at least one second end hole 313a is a square hole or a waist-shaped hole. That is to say, among the plurality of second end holes 313a of the protruding portion 313, all the second end holes 313a can be square holes, or all the second end holes 313a can be waist-shaped holes, or some of the second end holes 313a can be square holes and some of the second end holes 313a can be waist-shaped holes. Thereby, it is convenient for the actual structure design to match the structural shape of the protruding portion 313.

[0082] For another example, a plurality of protruding portions 313 are formed on the hole wall of the driving force receiving hole 31b, and the protruding portions 313 are arranged at intervals around the inner circumferential direction of the driving force receiving hole 31b. Thereby, the wall thickness can be reduced as much as possible.

[0083] It should be noted that the structural shapes of the protruding portions 313 can be the same or different. At the same time, the protruding portions 313 can also be arranged in a centrosymmetric manner with respect to the center of the driving force receiving hole 31b, so that the uniformity of the structure is better.

[0084] In one embodiment, please refer to Figure 10, the supporting end 311 includes a supporting body 3111 having a supporting hole 31a, and a transmission gear 3112 extending circumferentially around the outer periphery of the supporting body 3111. The transmission gear 3112 is spaced from a partial area of the supporting body 3111 to form a first end hole 311a. Along the axial direction of the coupling 31, one end of the first end hole 311a and the second end hole 313a that are close to each other is closed, so as to separate the first end hole 311a and the second end hole 313a.

[0085] That is to say, one side of the first end hole 311a close to the second end hole 313a is a closed end, and one side of the second end hole 313a close to the first end hole 311a is also a closed end. The first end hole 311a and the second end hole 313a are not communicated with each other. Compared with the design method in which the first end hole 311a and the second end hole 313a are communicated, adopting a complementary communication structure form can reduce the risk of distortion that is likely to occur when the coupling 31 rotates, so that the coupling 31 is not easily distorted. Thus, the structural strength of the coupling 31 can be greatly improved, making the transmission effect of the coupling 31 more stable.

[0086] In one embodiment, please refer to Figure 10 , the supporting end 311 includes a supporting body 3111 having a supporting hole 31a, and a transmission gear 3112 extending circumferentially around the outer periphery of the supporting body 3111. The transmission gear 3112 is spaced from a partial area of the supporting body 3111 to form a first end hole 311a. Along the axial direction of the coupling 31, the first end hole 311a and the second end hole 313a are arranged in a staggered manner. Thus, the structural strength of the coupling 31 can be further improved, making the transmission effect of the coupling 31 more stable.

[0087] In one embodiment, please refer to Figure 10 , the supporting end 311 includes a supporting body 3111 having a supporting hole 31a, and a transmission gear 3112 extending circumferentially around the outer periphery of the supporting body 3111. The transmission gear 3112 is spaced from a partial area of the supporting body 3111 to form a first end hole 311a. Along the axial direction of the coupling 31, one end of the first end hole 311a and the second end hole 313a that are away from each other is open. Thus, it is convenient for processing and manufacturing.

[0088] In one embodiment, please refer to Figure 16 , the coupling 31 includes a separating substrate 314 located between the supporting hole 31a and the driving force receiving hole 31b.

[0089] The separating substrate 314 has a mold alignment hole 314a formed therethrough, and the mold alignment hole 314a communicates with the supporting hole 31a and the driving force receiving hole 31b respectively.

[0090] That is to say, the support hole 31a and the driving force receiving hole 31b are separated by the partition substrate 314. The mold alignment holes 314a are formed on the partition substrate 314. The mold alignment holes 314a are through holes penetrating the partition substrate 314, and the opposite sides thereof are respectively communicated with the support hole 31a and the driving force receiving hole 31b. Thus, during the manufacturing process, the alignment of the upper and lower molds can be facilitated and made accurate.

[0091] It should be noted that the number of the mold alignment holes 314a is not limited, and can be 1 or multiple. For example, the partition substrate 314 has multiple mold alignment holes 314a, and the mold alignment holes 314a are circumferentially spaced around the center line of the partition substrate 314.

[0092] In one embodiment, please refer to Figure 10 , a part of the end face of the partition substrate 314 close to the support hole 31a is recessed to form a third end hole 314b, and one end of the third end hole 314b close to the driving force receiving hole 31b is closed.

[0093] Specifically, one end of the third end hole 314b close to the driving force receiving hole 31b is closed, while the other end away from the driving force receiving hole 31b is open. Thus, the purpose of reducing the plate thickness of the partition substrate 314 can be achieved.

[0094] It should be noted that the number of the third end holes 314b is not limited, and can be 1 or multiple. For example, the partition substrate 314 has multiple third end holes 314b, and the third end holes 314b are circumferentially spaced around the center line of the partition substrate 314.

[0095] In one embodiment, please refer to Figure 3 , the developing cartridge includes a developing roller 40 provided on the cartridge body 10. The driven gear 20 includes a developing roller gear 21. The developing roller 40 is connected to the developing roller gear 21. The outer peripheral surface of the coupling 31 meshes with the developing roller gear 21 for transmission. The tooth number ratio of the outer peripheral surface of the coupling 31 to the developing roller gear 21 is greater than or equal to 1.5 and less than or equal to 3. For example, the tooth number ratio is 1.5, 2, 2.4375 or 3. Exemplarily, the number of teeth on the outer peripheral surface of the coupling 31 is 39, and the number of teeth of the developing roller gear 21 is 16, and the tooth number ratio of the two is 2.4375.

[0096] Specifically, as the support hole 31a increases, the pitch circle of the gear on the outer peripheral surface of the coupling 31 also increases. The pitch circle of the meshing developing roller gear 21 decreases accordingly. Controlling the tooth number ratio of the gear of the coupling 31 to the developing roller gear 21 between 1.5 and 3 can achieve a good transmission effect and facilitate the structural design at the same time.

[0097] In one embodiment, please refer to Figure 3, the driven gear 20 includes a powder feeding roller gear 22. The outer peripheral surface of the coupling 31 meshes with the powder feeding roller gear 22 for transmission. The tooth number ratio of the outer peripheral surface of the coupling 31 to the powder feeding roller gear 22 is greater than or equal to 1.5 and less than or equal to 3. For example, the tooth number ratio is 1.5, 2, 2.1176 or 3. Exemplarily, the number of teeth on the outer peripheral surface of the coupling 31 is 36, and the number of teeth of the powder feeding roller gear 22 is 17, and the tooth number ratio of the two is 2.1176.

[0098] Correspondingly, as the support hole 31a increases, the pitch circle of the gear on the outer peripheral surface of the coupling 31 also increases. The pitch circle of the powder feeding roller gear 22 meshing with it correspondingly decreases. Controlling the tooth number ratio of the gear of the coupling 31 to the powder feeding roller gear 22 between 1.5 and 3 can achieve a better transmission effect and is convenient for structural design at the same time.

[0099] In a specific embodiment, the transmission gear 3112 includes a first transmission gear and a second transmission gear. The first transmission gear is used for meshing with the developing roller gear 21 for transmission, and the second transmission gear is used for meshing with the powder feeding roller gear 22 for transmission. The first transmission gear is located on the side of the second transmission gear away from the driving force receiving hole 31b.

[0100] The number of teeth of the first transmission gear is 39, the number of teeth of the second transmission gear is 36, the number of teeth of the developing roller gear 21 is 16, and the number of teeth of the powder feeding roller gear 22 is 17.

[0101] It should be noted that the specific shapes of the first transmission gear and the second transmission gear can be set according to actual situations.

[0102] For example, the first transmission gear is a helical gear or a spur gear, and the second transmission gear is a helical gear or a spur gear.

[0103] In a specific embodiment, the developing cartridge further includes a cover 50. The driven gear 20 and the transmission assembly 30 are arranged on one side of the cartridge body 10, and the cover 50 covers the side of the cartridge body 10 where the driven gear 20 and the transmission assembly 30 are located.

[0104] In the description of the present application, the description referring to terms such as "in an embodiment", "in some embodiments", "in a specific embodiment", or "exemplary" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine the different embodiments or examples described in the present application and the features of different embodiments or examples.

[0105] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are all included within the protection scope of the present application.

Claims

1. A developing cartridge, characterized in that, Comprising: A box body, with a partial area of the box body protruding to form support columns; A driven gear rotatably arranged on the box body; A transmission assembly, the transmission assembly includes a coupling, one end of the coupling has a support hole, and the other end has a driving force receiving hole; the coupling is rotatably installed on the support column through the support hole, and the outer peripheral surface of the coupling meshes and drives with the driven gear; On a plane perpendicular to the axial direction of the coupling, the projection of the driving force receiving hole is located within the projection range of the support hole.

2. The developing cartridge according to claim 1, wherein, The coupling includes a support end with the support hole and a receiving end with the driving force receiving hole, and a transmission gear meshing and driving with the driven gear is formed on the outer peripheral surface of the support end.

3. The developing cartridge according to claim 2, wherein, On a plane perpendicular to the axial direction of the coupling, the projection of the transmission gear is located outside the projection range of the support hole and extends circumferentially around the outer periphery of the projection of the support hole.

4. The developing cartridge according to claim 2, wherein, The support end includes a support body with the support hole and the transmission gear extending circumferentially around the outer periphery of the support body, and a first end hole is formed at an interval between the transmission gear and a partial area of the support body.

5. The developing cartridge according to claim 4, characterized in that, The support end has a plurality of the first end holes, and each of the first end holes is arranged at intervals circumferentially around the outer periphery of the support body.

6. The developing cartridge according to claim 1, wherein A partial area of the hole wall of the driving force receiving hole protrudes into the driving force receiving hole to form a protruding part, and a partial area of the protruding part is recessed to form a second end hole extending along the axial direction of the coupling.

7. The developing cartridge according to claim 6, characterized in that, The coupling includes a support end with the support hole and a receiving end with the driving force receiving hole, a transmission gear meshing and driving with the driven gear is formed on the outer peripheral surface of the support end, the support end includes a support body with the support hole and the transmission gear extending circumferentially around the outer periphery of the support body, and a first end hole is formed at an interval between the transmission gear and a partial area of the support body; Along the axial direction of the coupling, one end where the first end hole and the second end hole are close to each other is closed, so as to separate the first end hole and the second end hole; and / or, Along the axial direction of the coupling, the first end hole and the second end hole are arranged in a staggered manner; and / or, Along the axial direction of the coupling, one end where the first end hole and the second end hole face away from each other is open.

8. The developing cartridge according to claim 6, wherein, A plurality of the protruding parts are formed on the hole wall of the driving force receiving hole, and each of the protruding parts is arranged at intervals circumferentially around the inner periphery of the driving force receiving hole; and / or, The protruding part has a plurality of the second end holes, and at least one of the second end holes is a square hole or a waist-shaped hole.

9. The developing cartridge according to any one of claims 1-5, characterized in that, The coupling includes a separating substrate located between the support hole and the driving force receiving hole; The separating substrate has a mold alignment hole formed therethrough, and the mold alignment hole communicates with the support hole and the driving force receiving hole respectively; and / or, A partial area of the end face of the separating substrate close to the support hole side is recessed to form a third end hole, and one end of the third end hole close to the driving force receiving hole is closed.

10. The developing cartridge according to any one of claims 1-5, characterized in that, The developing cartridge includes a developing roller provided on the cartridge body. The driven gear includes a developing roller gear. The developing roller is connected to the developing roller gear. The outer peripheral surface of the coupling is in meshing transmission with the developing roller gear. The tooth number ratio of the outer peripheral surface of the coupling to the developing roller gear is greater than or equal to 1.5 and less than or equal to 3; and / or, The driven gear includes a powder feeding roller gear. The outer peripheral surface of the coupling is in meshing transmission with the powder feeding roller gear. The tooth number ratio of the outer peripheral surface of the coupling to the powder feeding roller gear is greater than or equal to 1.5 and less than or equal to 3.

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