Developing cartridge

Abstract

The invention relates to a developing box which is detachably mounted in imaging equipment provided with a driving force output part, the developing box comprises a developing shell, a developing roller and a powder feeding roller, the developing roller and the powder feeding roller are rotatably arranged on the developing shell, the powder feeding roller is in contact with the developing roller, and the developing box further comprises a driving force transmission assembly rotatably arranged at the longitudinal tail end of the developing box. The driving force transmission assembly comprises a driving force receiving part, a first transmission part, a second transmission part and a third transmission part, and the driving force receiving part and the first transmission part can rotate synchronously; the driving force transmission assembly further at least comprises a first middle transmission part, the driving force receiving part is used for being combined with the driving force output piece to receive the driving force, the third transmission part and the first middle transmission part directly receive the driving force from the first transmission part, and the second transmission part indirectly receives the driving force from the first transmission part through the first middle transmission part. The first middle transmission part and the third transmission part are coaxially arranged and can rotate relatively; according to the scheme, the developing box can be miniaturized.

Description

Technical Field

[0001] The invention relates to the field of electronic photographic imaging, and in particular to a developing box detachably mounted on an electronic photographic imaging device. Background Art

[0002] Developer cartridges are widely used in imaging devices such as laser printers / copiers, etc. The developer cartridges contain toner for the imaging device to perform developing / imaging work, as well as rotating parts such as a developing roller, a powder feeding roller, and a stirring frame. Usually, a driving force receiving member is also provided at the end of the developer cartridge for receiving the driving force provided by the imaging device to drive the above-mentioned rotating parts to rotate and perform developing / imaging work.

[0003] Usually, the developer cartridge transmits driving force through gear transmission. Generally, the driving force transmission assembly includes a driving gear, a developing gear, a powder feeding gear, a stirring gear and an idler gear.

[0004] In the existing developer box, the developing gear receives the driving force in the following ways: the driving gear transmits the driving force to the powder feeding gear, and the powder feeding gear transmits the driving force to the developing gear directly or through an idler gear. Because the powder feeding gear is installed at the longitudinal end of the powder feeding roller, the powder feeding gear needs to drive the powder feeding roller to rotate after receiving the driving force. The powder feeding roller will cause the powder feeding gear to produce greater vibration during rotation. If it is transmitted to the developing gear through the powder feeding gear, the vibration of the developing gear will increase, thereby causing uneven distribution of the carbon powder carried on the surface of the developing roller, and ultimately resulting in poor development / imaging effects. Summary of the invention

[0005] The present invention provides a developing box to solve the above technical problems. The specific solution is:

[0006] A developing box is detachably mounted in an imaging device provided with a driving force output member, the developing box comprising a developing housing capable of accommodating carbon powder and a developing roller and a powder feeding roller rotatably arranged in the developing housing, the developing roller being used to output carbon powder to the outside, the powder feeding roller being in contact with the developing roller, the developing box also comprising a driving force transmission assembly rotatably arranged at its longitudinal end, the driving force transmission assembly comprising a driving force receiving portion, a first transmitting portion, a second transmitting portion and a third transmitting portion, the driving force receiving portion and the first transmitting portion being capable of synchronously rotating, the second transmitting portion being arranged at the longitudinal end of the developing roller , the third transmission part is installed at the longitudinal end of the powder feeding roller, the side where the driving force receiving part is located is the driving end, and in the left and right direction, the side opposite to the driving end is the non-driving end; the driving force transmission assembly also includes at least a first intermediate transmission part, the driving force receiving part is used to combine with the driving force output member to receive the driving force, the third transmission part and the first intermediate transmission part directly receive the driving force from the first transmission part, and the second transmission part indirectly receives the driving force from the first transmission part through the first intermediate transmission part; the first intermediate transmission part is coaxially arranged with the third transmission part, and the two can rotate relative to each other.

[0007] In the left-right direction, the first intermediate transmission portion is closer to the non-driving end than the third transmission portion.

[0008] The developing box also includes a bracket arranged at the longitudinal end, and the bracket is detachably mounted on the developing shell. The bracket includes a bracket main body and a first mounting portion. Along the left and right direction, the first mounting portion protrudes from the side of the bracket main body away from / close to the non-driving end. The first mounting portion is at least used to support the powder feeding roller, and the first intermediate transfer portion is rotatably mounted on the first mounting portion.

[0009] The first intermediate transfer portion is rotatably mounted on the developing housing.

[0010] In the left-right direction, the first intermediate transmission portion is farther from the non-driving end than the third transmission portion.

[0011] The developing box further includes an end cover arranged at a longitudinal end, the end cover is detachably mounted on the developing housing, and the first intermediate transfer portion is rotatably mounted on the end cover.

[0012] The driving force transmission assembly also includes a second intermediate transmission part, the first transmission part cooperates with the third transmission part and the first intermediate transmission part respectively, and the second intermediate transmission part cooperates with the first intermediate transmission part and the second transmission part respectively.

[0013] The developing box also includes a bracket and an end cover arranged at the longitudinal end, and the bracket and the end cover are detachably mounted on the developing shell, the bracket is at least used to support the powder feeding roller, and in the left and right directions, the end cover is farther away from the non-driving end than the bracket, and the second intermediate transfer part is rotatably mounted on the bracket or the end cover or the developing shell.

[0014] The powder feeding roller includes a powder feeding layer and a powder feeding roller shaft extending in the left-right direction, the powder feeding layer is used to transport carbon powder to the developing roller, in the left-right direction, the powder feeding roller shaft exceeds the powder feeding layer, the powder feeding roller shaft includes an adjacently arranged driven part and a shaft main body, the driven part is located at the longitudinal end of the shaft main body, the powder feeding layer wraps a part of the shaft main body, the third transmission part cooperates with the driven part, and the first intermediate transmission part is rotatably mounted on the shaft main body.

[0015] Along the left-right direction, a mounting hole is provided on the side wall of the developing housing on the side where the driving force receiving member is located, and the mounting hole is used to allow the powder feeding roller to be installed inside the developing housing along the left-right direction; when the powder feeding roller is installed in the developing housing, when viewed along the left-right direction, the powder feeding roller is not coaxial with the mounting hole.

[0016] In the present invention, an intermediate driving force transmission part is provided between the second driving force transmission part and the first driving force transmission part, and the intermediate driving force transmission part and the third driving force transmission part are coaxially provided and can rotate relative to each other, so that the developing box can be miniaturized. In addition, the driving force is transmitted to the second driving force transmission part through the intermediate driving force transmission part instead of the third driving force transmission part, which can greatly reduce the vibration influence on the second driving force transmission part, thereby improving the development / imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of a developing box involved in an embodiment of the present invention.

[0018] Figure 2 2 is an exploded view of a developing box according to an embodiment of the present invention.

[0019] Figure 3A It is a schematic diagram of the powder feeding roller and the developing housing involved in the embodiment of the present invention when viewed from left to right along the left-right direction.

[0020] Figure 3B It is a schematic diagram of a powder feeding roller and a developing housing involved in an embodiment of the present invention.

[0021] Figure 3C Schematic diagram of a powder feeding roller, a developing housing and a sealing component involved in an embodiment of the present invention.

[0022] Figure 4A and Figure 4BIt is a schematic diagram of the driving force transmission assembly after some components of the developing box involved in the embodiment of the present invention are hidden.

[0023] Figure 4C Schematic diagram of a powder feeding roller according to an embodiment of the present invention.

[0024] Figure 5A It is a side view of the driving force transmission assembly involved in the embodiment of the present invention when viewed from left to right along the left-right direction.

[0025] Figure 5B It is a side view of the driving force transmission assembly involved in the embodiment of the present invention after hiding the third transmission part, when observed from left to right along the left-right direction.

[0026] Figure 6 It is a side view of a driving force transmission assembly involved in another embodiment of the present invention when viewed from left to right along the left-right direction. DETAILED DESCRIPTION

[0027] Figure 1 is a three-dimensional diagram of a developing cartridge according to an embodiment of the present invention; Figure 2 2 is an exploded view of a developing box according to an embodiment of the present invention.

[0028] The developing cartridge 100 is used to be detachably installed in an image forming device for performing image forming / developing operations.

[0029] like Figure 1 and Figure 2 As shown, the developing box 100 includes a developing housing 1 and a developing roller 2 and a powder feeding roller 3 (such as Figure 3B The developing housing 1 comprises a first housing 11 and a second housing 12 which are combined with each other, a powder bin 13 for accommodating toner is formed between the first housing 11 and the second housing 12, the stirring rack is used to stir the toner so as to transport it to the powder feeding roller 3, the powder feeding roller 3 is in contact with the developing roller 2, and is used to transport the toner to the developing roller 2, and the developing roller 2 then transports the carried toner to the photosensitive member outside the developing box 100, thereby developing the electrostatic latent image on the surface of the photosensitive member.

[0030] Furthermore, the developing box 100 also includes a driving force transmission assembly 4 rotatably disposed at a longitudinal end, and the driving force transmission assembly 4 is used to receive and transmit the driving force provided by the imaging device to drive the rotating component to rotate. Specifically, the driving force transmission assembly 4 includes a driving head 41, a second transmission part 42, a third transmission part 43 and a fourth transmission part (not shown in the figure), the driving head 41 includes a driving force receiving part 411 and a first transmission part 412, the driving force receiving part 411 is used to combine with the driving force output part in the imaging device to receive the driving force, the first transmission part 412 and the driving force receiving part 411 can rotate synchronously, the first transmission part 412 is used to receive the driving force of the driving force receiving part 411, and directly or indirectly transmit the driving force to at least one of the second transmission part 42, the third transmission part 43 and the fourth transmission part, the first transmission part 412 and the driving force receiving part 411 are formed integrally or separately; the second transmission part 42 is installed at the longitudinal end of the developing roller 2 and is coaxially arranged with the developing roller 2 for driving the developing roller 2 to rotate; the third transmission part 43 is installed at the longitudinal end of the powder feeding roller 3 and is coaxially arranged with the powder feeding roller 3 for driving the powder feeding roller 3 to rotate; the fourth transmission part is installed at the longitudinal end of the stirring member and is coaxially arranged with the stirring member for driving the stirring member to rotate.

[0031] To make the description accurate and easy to understand, the present application defines the length direction / longitudinal direction of the developing box 100 as the left-right direction, the width direction / lateral direction of the developing box 100 as the front-to-back direction, and the height direction / vertical direction of the developing box 100 as the up-down direction; the left-right direction, the front-to-back direction, and the up-down direction are intersected with each other, and preferably, the left-right direction, the front-to-back direction, and the up-down direction are perpendicular to each other; further, according to the arrangement direction of the developing roller 2 and the powder bin 13, the developing roller 2 is in the front and the powder bin 13 is in the back. As one of the structures, the first shell 11 is at the top and the second shell 12 is at the bottom.

[0032] In the present application, the end where the driving force receiving portion 411 is located is referred to as the driving end / left, and the end opposite to the driving end / left in the left-right direction is referred to as the non-driving end / right.

[0033] Under the action of driving force, the driving force receiving part 411 / the first transmission part 412, the second transmission part 42, the third transmission part 43 and the fourth transmission part respectively rotate around the first axis L41, the second axis L2, the third axis L3 and the fourth axis (not shown in the figure) parallel to the left and right directions, and the developing roller 2, the powder feeding roller 3 and the stirring frame respectively rotate around the second axis L2, the third axis L3 and the fourth axis (not shown in the figure) parallel to the left and right directions.

[0034] Furthermore, the developing box 100 also includes an end cover 14 and a bracket 15 arranged at the driving end, and the end cover 14 and the bracket 15 are detachably mounted on the developing housing 1. Specifically, the end cover 14 can be used to cover at least a portion of the driving force transmission assembly 4 to protect the driving force transmission assembly 4; the bracket 15 can be used to support at least one of the developing roller 2 and the powder feeding roller 3. Further, the bracket 15 includes a bracket body 151, a first mounting portion 152 and a second mounting portion 153 extending from the bracket body 151 in a direction away from / close to the non-driving end, the first mounting portion 152 protrudes and extends from a side away from / close to the non-driving end, the first mounting portion 152 is used to support the first intermediate transfer portion 44 described later, and the first mounting portion 153 can also be used to support the powder feeding roller 3, thereby, the supported area of ​​the powder feeding roller shaft 31 described later becomes larger, and the powder feeding roller 3 can rotate more stably, and the driving head 41 can rotatably cooperate with the second mounting portion 153, and expose at least a portion to the outside through the through hole provided on the end cover 14 to receive the driving force.

[0035] In some embodiments, the first mounting portion 152 and the second mounting portion 153 may also be disposed on the developing housing 1 , or on the end cover 14 , as long as they can support the first intermediate transfer portion 44 and the driving head 41 .

[0036] Furthermore, the developing box 100 also includes a chip assembly 5 arranged at its longitudinal end, and the chip assembly 5 is used to establish a communication connection with the imaging device. The chip assembly 5 at least includes a chip (not shown in the figure) to contact the electrical contacts set in the imaging device.

[0037] Furthermore, the developing box 100 also includes a powder discharge knife 6, a part of which is used to contact the developing roller 2 so that the carbon powder carried on the surface of the developing roller 2 is evenly distributed.

[0038] Figure 3A is a schematic diagram of a powder feeding roller and a developing housing according to an embodiment of the present invention when viewed from left to right along the left-right direction; Figure 3B Schematic diagram of a powder feeding roller and a developing housing according to an embodiment of the present invention; Figure 3C Schematic diagram of a powder feeding roller, a developing housing and a sealing component involved in an embodiment of the present invention.

[0039] like Figure 3A and Figure 3BAs shown, the second shell 12 is provided with a mounting hole 121 on the side wall in the left and right directions, and the mounting hole 121 is used to allow the powder feeding roller 3 to be installed in the interior of the developing shell 1 along the left and right directions. Preferably, the mounting hole 121 is located on the side wall 124 on the side where the driving end is located, and the mounting hole 121 connects the interior and the exterior of the developing shell 1. Further, when the powder feeding roller 3 is installed, it is installed in the interior of the developing shell 1 from the driving end through the mounting hole 121. Further, when the powder feeding roller 3 is installed in the interior of the developing shell 1, when observed in the left and right directions, the rotation axis (the third axis L3) of the powder feeding roller 3 does not coincide with the center of the mounting hole 121, that is, the powder feeding roller 3 is eccentrically arranged with the mounting hole 121, and in the left and right directions, the powder feeding roller 3 and the inner surface 123 of the side wall 124 may interfere with each other. In this way, after the powder feeding roller 3 is initially installed in the interior of the developing shell 1, and the bracket 15, the driving force transmission assembly 4 and the end cover 14 are not installed, the powder feeding roller 3 can be prevented from detaching from the mounting hole 121 in the left and right directions. In other embodiments, the mounting hole 121 may also be provided at the non-driving end.

[0040] like Figure 3C As shown, the developing box 100 is also provided with a sealing component 122 that cooperates with the mounting hole 121. The sealing component 122 can prevent carbon powder from leaking from the mounting hole 121, and can further prevent the powder feeding roller 3 from detaching from the mounting hole 121 in the left-right direction.

[0041] Figure 4A and Figure 4B It is a schematic diagram of a driving force transmission assembly after some components of the developing cartridge according to an embodiment of the present invention are hidden; Figure 4C Schematic diagram of a powder feeding roller according to an embodiment of the present invention; Figure 5A is a side view of the driving force transmission assembly involved in the embodiment of the present invention when viewed from left to right along the left-right direction; Figure 5B It is a side view of the driving force transmission assembly involved in the embodiment of the present invention after hiding the third transmission part, when observed from left to right along the left-right direction.

[0042] like Figure 4A , Figure 4B , Figure 4C , Figure 5A and Figure 5B As shown, in the present embodiment, the driving force transmission assembly 4 further includes at least a first intermediate transmission part 44. Preferably, the first intermediate transmission part 44 is coaxially arranged with the third transmission part 43, and the first intermediate transmission part 44 and the third transmission part 43 can rotate relative to each other, that is, the first intermediate transmission part 44 and the third transmission part 43 are not connected. More preferably, in the left and right directions, the first intermediate transmission part 44 and the third transmission part 43 are spaced apart, that is, the first intermediate transmission part 44 and the third transmission part 43 are not in contact with each other. In other embodiments, the first intermediate transmission part 44 and the third transmission part 43 may also be in contact with each other.

[0043] More specifically, the first intermediate transmission part 44 is mounted on the bracket 15 or the powder roller shaft 31 described later. Preferably, the first intermediate transmission part 44 is rotatably mounted on the first mounting part 152. In the left-right direction, the first intermediate transmission part 44 is closer to the non-driving end than the third transmission part 43. The driving force transmission assembly 4 also includes a second intermediate transmission part 45, which is rotatably mounted on the third mounting part 154 (such as Figure 2 shown).

[0044] The powder feeding roller 3 includes a powder feeding layer 32 and a powder feeding roller shaft 31 extending in the left-right direction, the powder feeding layer 32 is used to transport carbon powder to the developing roller 2, and in the left-right direction, the powder feeding roller shaft 31 exceeds the powder feeding layer 32. Further, the powder feeding roller shaft 31 includes an adjacent shaft body 312 and a driven part 311, the driven part 311 is located at the longitudinal end of the shaft body 312, and the powder feeding layer 32 wraps a part of the shaft body 312; specifically, the third transmission part 43 cooperates with the driven part 311 to drive the powder feeding roller 3 to rotate, and when viewed in the left-right direction, the driven part 311 is D-shaped. In some embodiments, when the first intermediate transmission part 44 is installed on the powder feeding roller shaft 31, the first intermediate transmission part 44 needs to be installed on the shaft body 312, and when viewed in the left-right direction, the shaft body 312 is circular, so that the first intermediate transmission part 44 and the third transmission part 43 / powder feeding roller 3 can achieve relative rotation.

[0045] In some embodiments, the first intermediate transfer portion 44 can also be rotatably mounted on the end cover 14 or the developing housing 1, and a support shaft for supporting the first intermediate transfer portion 44 is provided on the end cover 14 or the developing housing 1. When the first intermediate transfer portion 44 is mounted on the end cover 14, in the left-right direction, the first intermediate transfer portion 44 is farther away from the non-driving end than the third transfer portion 43; the second intermediate transfer portion 45 can also be rotatably mounted on the inner side of the end cover 14 (the side close to the non-driving end in the left-right direction) or the developing housing 1.

[0046] Among them, the first intermediate transmission part 44 is coaxial with the third transmission part 43, that is, under the action of driving force, the first intermediate transmission part 44 rotates around the third axis L3 parallel to the left and right direction, and the second intermediate transmission part 45 has a fifth axis L45 parallel to the left and right direction. Under the action of driving force, the second intermediate transmission part 45 rotates around the fifth axis L45 parallel to the left and right direction.

[0047] Further, the first transfer part 412 cooperates with the third transfer part 43 and the first intermediate transfer part 44 respectively, and the second intermediate transfer part 45 cooperates with the first intermediate transfer part 44 and the second transfer part 42 respectively, that is, after receiving the driving force, the driving force receiving part 411 rotates synchronously with the first transfer part 412 along the direction indicated by r2, and the first transfer part 412 indirectly transmits the driving force to the second transfer part 42 through the first intermediate transfer part 44 and the second intermediate transfer part 45, so that the second transfer part 42 rotates along the direction indicated by r1, thereby driving the developing roller 2 to rotate along the direction indicated by r1; the first transfer part 412 directly transmits the driving force to the third transfer part 43 at the same time, so that the third transfer part 43 rotates along the direction indicated by r1, thereby driving the powder feeding roller 3 to rotate along the direction indicated by r1; the first transfer part 412 also directly or indirectly transmits the driving force to the fourth transfer part, so that the fourth transfer part rotates to drive the stirring frame to rotate; further, under the action of the driving force, the first intermediate transfer part 44 rotates along the direction indicated by r1, and the second intermediate transfer part 45 rotates along the direction indicated by r2.

[0048] Figure 6 It is a side view of a driving force transmission assembly involved in another embodiment of the present invention when viewed from left to right along the left-right direction.

[0049] like Figure 6 As shown, in other embodiments, the driving force transmission assembly 4 also includes an intermediate driving force transmission part. Specifically, the intermediate driving force transmission part includes a second intermediate transmission part 45 and a third intermediate transmission part 46. That is, the intermediate driving force transmission part does not include a first intermediate transmission part 44 coaxially arranged with the third transmission part 43.

[0050] Further, the second intermediate transfer portion 45 is rotatably mounted on the third mounting portion 154 (eg, Figure 2 As shown), in some embodiments, the second intermediate transfer portion 45 can also be installed on the inner side of the end cover 14 (the side close to the non-driving end in the left-right direction) or the developing shell 1; the third intermediate transfer portion 46 can be rotatably mounted on any one of the bracket 15, the inner side of the end cover 14 and the developing shell 1.

[0051] Further, the first transmission part 412 cooperates with the third transmission part 43 and the third intermediate transmission part 46 respectively, and the second intermediate transmission part 45 cooperates with the third intermediate transmission part 46 and the second transmission part 42 respectively. That is to say, after receiving the driving force, the driving force receiving part 411 rotates synchronously with the first transmission part 412 along the direction indicated by r2, and the first transmission part 412 indirectly transmits the driving force to the second transmission part 42 through the third intermediate transmission part 46 and the second intermediate transmission part 45, so that the second transmission part 42 rotates along the direction indicated by r1, thereby driving the developing roller 2 to rotate along the direction indicated by r1; the first transmission part 412 directly transmits the driving force to the third transmission part 43 at the same time, so that the third transmission part 43 rotates along the direction indicated by r1, thereby driving the powder feeding roller 3 to rotate along the direction indicated by r1; the first transmission part 412 directly or indirectly transmits the driving force to the fourth transmission part at the same time, so that the fourth transmission part rotates to drive the stirring frame to rotate; further, under the action of the driving force, the third intermediate transmission part 46 rotates along the direction indicated by r1, and the second intermediate transmission part 45 rotates along the direction indicated by r2.

[0052] It should be noted that the first transmission part 412, the second transmission part 42, the third transmission part 43, the fourth transmission part, the first intermediate transmission part 44, the second intermediate transmission part 45, and the third intermediate transmission part 46 involved in the solution of the present application are preferably set as gears. In other embodiments, the above-mentioned components can also be set as protrusions, ratchets, pulleys, etc., as long as the transmission of driving force can be achieved.

[0053] In other embodiments, the driving force transmission method can also be set to belt drive (such as flat belt, V belt, synchronous toothed belt).

[0054] The beneficial effects that can be obtained by this embodiment are:

[0055] 1. The second transfer part 42 does not cooperate with the third transfer part 43. The driving force is transmitted to the second transfer part 42 through the first intermediate transfer part 44 and the second intermediate transfer part 45 in sequence, and then the second transfer part 42 drives the developing roller 2 to rotate. At the same time, the first intermediate transfer part 44 and the third transfer part 43 are coaxially arranged, but the two can rotate relative to each other. That is to say, the first intermediate transfer part 44 is the same as the second intermediate transfer part 45. The influence of the vibration of the third transfer part 43 and the vibration of the powder feeding roller 3 will be greatly reduced. Therefore, the vibration amplitude of the first intermediate transfer part 44 and the second intermediate transfer part 45 is smaller. When the second transfer part 42 receives the driving force from the second intermediate transfer part 45 and the first intermediate transfer part 44, it will run more smoothly, and the developing roller 2 will also run more smoothly, which is beneficial to improving the development / imaging quality.

[0056] 2. The first intermediate transfer portion 44 and the third transfer portion 43 are coaxially arranged, which can make the structure of the developing box more compact and is conducive to the miniaturized design of the developing box.

[0057] 3. The first intermediate transfer part 44 and the third transfer part 43 are coaxially arranged. When the first transfer part 412 drives the first intermediate transfer part 44 and the third transfer part 43, the directions of the forces applied to the first intermediate transfer part 44 and the third transfer part 43 are the same. The developer box designer can more specifically set a limiting structure to prevent the developer box 100 from shaking. Only one limiting structure needs to be set according to the direction of the force. On the contrary, if the first intermediate transfer part 44 and the third transfer part 43 are not coaxial, the direction of the force applied to the first intermediate transfer part 44 is different from the direction of the force applied to the third transfer part 43, and at least two limiting structures need to be set.

[0058] 4. Compared with the structure in which the holes arranged on the two side walls at the left and right ends of the developing housing 1 can just allow the powder feeding roller shaft 31 to pass through, in the scheme of the present application, the mounting hole 121 on at least one side wall is much larger than the diameter of the powder feeding roller 3. This results in that after the powder feeding roller 3 is installed into the inside of the developing housing 1 from the driving end through the mounting hole 121, the swing amplitude during rotation is larger. When the powder feeding roller shaft 31 is supported by the bracket body 151 and the first mounting portion 152 at the same time, the swing of the powder feeding roller 3 can be effectively suppressed.

[0059] 5. When the first intermediate transfer part 44 is supported by the powder feeding roller shaft 31, when the first intermediate transfer part 412 drives the first intermediate transfer part 44 to rotate, the first intermediate transfer part 44 will give a thrust to the powder feeding roller shaft 31, and the thrust will hinder the rotation of the powder feeding roller 3. Therefore, compared with the first intermediate transfer part 44 being supported by the powder feeding roller shaft 31, the first intermediate transfer part 44 being supported by the first mounting part 152 is more conducive to maintaining the stability of the rotation of the powder feeding roller 3.

[0060] 6. An intermediate driving force transmission part (for example, the first intermediate transmission part 44 and the second intermediate transmission part 45, or the third intermediate transmission part 46 and the second intermediate transmission part 45) is provided between the second transmission part 42 and the first transmission part 412. The second transmission part 42 indirectly receives the driving force through the intermediate driving force transmission part, which can increase the transmission ratio between the second transmission part 42 and the first transmission part 412.

Claims

1. A developing cartridge, detachably mounted in an imaging device provided with a driving force output member, the developing cartridge comprising a developing housing for accommodating carbon powder, and a developing roller and a powder feeding roller rotatably arranged in the developing housing, the developing roller being used to output carbon powder to the outside, the powder feeding roller being in contact with the developing roller, wherein: The developing box also includes a driving force transmission assembly rotatably arranged at its longitudinal end, the driving force transmission assembly includes a driving force receiving portion, a first transmission portion, a second transmission portion and a third transmission portion, the driving force receiving portion and the first transmission portion can rotate synchronously, the second transmission portion is installed at the longitudinal end of the developing roller, the third transmission portion is installed at the longitudinal end of the powder feeding roller, the side where the driving force receiving portion is located is the driving end, and the side opposite to the driving end in the left-right direction is the non-driving end; The driving force transmission assembly further comprises at least a first intermediate transmission part, the driving force receiving part is used to be combined with the driving force output member to receive the driving force, the third transmission part and the first intermediate transmission part directly receive the driving force from the first transmission part, and the second transmission part indirectly receives the driving force from the first transmission part through the first intermediate transmission part; The first intermediate transmission part and the third transmission part are coaxially arranged, and the two can rotate relative to each other.

2. The developing box according to claim 1, characterized in that: In the left-right direction, the first intermediate transmission portion is closer to the non-driving end than the third transmission portion.

3. The developing box according to claim 2, characterized in that: The developing box also includes a bracket arranged at the longitudinal end, and the bracket is detachably mounted on the developing shell. The bracket includes a bracket main body and a first mounting portion. Along the left and right direction, the first mounting portion protrudes from the side of the bracket main body away from / close to the non-driving end. The first mounting portion is at least used to support the powder feeding roller, and the first intermediate transfer portion is rotatably mounted on the first mounting portion.

4. The developing box according to claim 2, characterized in that: The first intermediate transfer portion is rotatably mounted on the developing housing.

5. The developing box according to claim 1, characterized in that: In the left-right direction, the first intermediate transmission portion is farther from the non-driving end than the third transmission portion.

6. The developing box according to claim 5, characterized in that: The developing box further includes an end cover arranged at a longitudinal end, the end cover is detachably mounted on the developing housing, and the first intermediate transfer portion is rotatably mounted on the end cover.

7. The developing cartridge according to claim 1, wherein: The driving force transmission assembly also includes a second intermediate transmission part, the first transmission part cooperates with the third transmission part and the first intermediate transmission part respectively, and the second intermediate transmission part cooperates with the first intermediate transmission part and the second transmission part respectively.

8. The developing cartridge according to claim 7, wherein: The developing box also includes a bracket and an end cover arranged at the longitudinal end, and the bracket and the end cover are detachably mounted on the developing shell, the bracket is at least used to support the powder feeding roller, and in the left and right directions, the end cover is farther away from the non-driving end than the bracket, and the second intermediate transfer part is rotatably mounted on the bracket or the end cover or the developing shell.

9. The developing cartridge according to claim 1, wherein: The powder feeding roller includes a powder feeding layer and a powder feeding roller shaft extending in the left-right direction, the powder feeding layer is used to transport carbon powder to the developing roller, in the left-right direction, the powder feeding roller shaft exceeds the powder feeding layer, the powder feeding roller shaft includes an adjacently arranged driven part and a shaft main body, the driven part is located at the longitudinal end of the shaft main body, the powder feeding layer wraps a part of the shaft main body, the third transmission part cooperates with the driven part, and the first intermediate transmission part is rotatably mounted on the shaft main body.

10. The developing box according to any one of claims 1 to 9, characterized in that: Along the left-right direction, a mounting hole is provided on the side wall of the developing housing on the side where the driving force receiving member is located, and the mounting hole is used to allow the powder feeding roller to be mounted inside the developing housing along the left-right direction; When the powder feeding roller is mounted to the developing housing, the powder feeding roller is not coaxial with the mounting hole when viewed in the left-right direction.

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