Powder feeding roller and developing box

Abstract

The utility model relates to a developing box which is detachably mounted on imaging equipment provided with a power supply part. The developing box comprises a developing shell and a developing part, the developing roller is rotatably arranged in the developing shell and comprises a developing roller shaft extending in the first direction and a developing layer covering the outer surface of the developing roller shaft; the powder feeding roller is rotatably arranged in the developing shell and comprises a powder feeding roller shaft extending in the first direction and a powder feeding layer wrapping the outer surface of the powder feeding roller shaft, and the powder feeding layer makes contact with the developing layer; the conductive component is used for being directly or indirectly electrically connected / in contact with the power supply part, is in contact with an area outside the powder feeding roller shaft and is not in contact with the developing roller shaft; in a second direction crossed with the first direction, an opening part facing forwards is formed in the developing shell, the developing roller is arranged at the opening part, a containing groove is formed in the inner wall of the developing shell and used for containing a part of the powder feeding roller, and the powder feeding roller is in contact with the developing roller; in the second direction, the containing groove is located behind the opening part.

Description

Technical Field

[0001] This utility model relates to the field of electrophotographic imaging, and more particularly to a developing cartridge that can be detachably installed in an electrophotographic imaging device and a powder feeding roller installed in the developing cartridge. Background Technology

[0002] Existing developing cartridges include a powder feeding roller, which comprises a conductive powder feeding roller shaft and a powder feeding layer / sponge layer covering the outer surface of the powder feeding roller shaft. During the imaging process, the developing cartridge is typically powered by an electrical connection / contact between a conductive steel sheet and the end of the powder feeding roller shaft. However, the developing cartridge needs to rotate during imaging, and during this rotation, the powder feeding roller will have slight movement along its length, causing the end of the powder feeding roller shaft to sometimes contact the conductive steel sheet and sometimes not. Therefore, such developing cartridges are prone to generating sparks during imaging, posing a safety hazard. Utility Model Content

[0003] This utility model provides a powder feeding roller and a developing cartridge to solve the above-mentioned technical problems. The specific solution is as follows:

[0004] A developing cartridge, detachably mounted in an imaging device equipped with a power supply, includes: a developing housing for containing developer; a developing roller rotatably disposed within the developing housing, comprising a developing roller shaft extending along a first direction and a developing layer covering the outer surface of the developing roller shaft; a powder feeding roller rotatably disposed within the developing housing, comprising a powder feeding roller shaft extending along the first direction and a powder feeding layer covering the outer surface of the powder feeding roller shaft, the powder feeding layer contacting the developing layer; a conductive member for directly or indirectly electrically connecting / contacting with the power supply and contacting an area other than the powder feeding roller shaft to supply power to the powder feeding roller, and the conductive member not contacting the developing roller shaft; along a second direction intersecting the first direction, the developing housing forms a forward-facing opening, the developing roller is disposed in the opening, and a receiving groove is formed on the inner wall of the developing housing for accommodating a portion of the powder feeding roller, the powder feeding roller contacting the developing roller; along the second direction, the receiving groove is located behind the opening.

[0005] In some embodiments, the conductive member includes at least a first conductive element, which includes at least a power receiving portion and a first power output portion. The power receiving portion is electrically connected / in contact with the first power output portion. The power receiving portion is also used to electrically connect / in contact with a power supply component to receive power provided by the imaging device. The first power output portion is used to electrically connect / in contact with an area other than the powder feeding roller shaft to supply power to the powder feeding roller.

[0006] In some embodiments, the conductive member includes a first conductive member and a second conductive member, the first conductive member being used to electrically connect the power supply member and the second conductive member, and at least a portion of the second conductive member being disposed on the inner surface of the receiving groove.

[0007] In some embodiments, the conductive member includes a first conductive element and a second conductive element, the second conductive element being separately formed from the first conductive element. A portion of the first conductive element is used for electrical connection / contact with a power supply element. The second conductive element includes a power input portion and a third power output portion, the power input portion and the third power output portion being electrically connected / contacted. The power input portion is used for electrical connection / contact with the first conductive element, and the third power output portion is used for electrical connection / contact with an area other than the powder feeding roller shaft.

[0008] In some embodiments, the developing roller includes a developing roller shaft and a developing layer covering the outer surface of the developing roller shaft. The conductive member includes a first conductive element and a powder discharge blade disposed on the developing housing. A portion of the powder discharge blade is used to contact the developing layer. The first conductive element includes a power receiving portion and a second power output portion. The second power output portion is electrically connected to the power receiving portion. The power receiving portion is used to be electrically connected / contacted with a power supply component to receive power provided by the imaging device. The second power output portion is used to be electrically connected / contacted with the powder discharge blade to supply power to the developing roller.

[0009] In some embodiments, the imaging device is provided with two power supply components, and the conductive member is electrically connected / in contact with at least one of the two power supply components.

[0010] A powder feeding roller, which is suitable for a developing cartridge as described above.

[0011] In some embodiments, the powder feeding roller shaft and the powder feeding layer are disconnected from electrical connection / contact, and the outer surface of the powder feeding layer is conductive.

[0012] In some embodiments, the powder feeding roller shaft is made of a non-conductive material.

[0013] In some embodiments, a non-conductive intermediate layer is provided between the powder feeding roller shaft and the powder feeding layer.

[0014] In some embodiments, along the first direction, the length of the non-conductive intermediate layer is not shorter than the length of the powder feeding layer, and the non-conductive intermediate layer is a non-conductive coating applied to the outer surface of the powder feeding roller shaft or coated on the inner surface of the powder feeding layer.

[0015] In some embodiments, the non-conductive intermediate layer is an isolation sleeve installed between the powder feeding roller shaft and the powder feeding layer, and the isolation sleeve is made of a non-conductive material.

[0016] In some embodiments, when the isolation sleeves are formed as a plurality of spaced-apart sleeves along a first direction, the length of the isolation sleeves along the first direction is shorter than the length of the powder feeding layer along the first direction.

[0017] In some embodiments, the isolation sleeves are formed as a plurality of sleeves spaced apart along the circumferential direction. Attached Figure Description

[0018] Figure 1 This is a perspective view of the developing cartridge involved in Embodiment 1 of this utility model.

[0019] Figure 2 This is an exploded view of some components of the developing cartridge involved in Embodiment 1 of this utility model.

[0020] Figure 3 This is the developing cartridge involved in Embodiment 1 of this utility model, along... Figure 1 A cross-sectional view taken from left to right along the first direction after being cut along the AA direction. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, the developing cartridge 100 includes a developing housing 1, a developing roller 2 rotatably disposed in the developing housing 1, and a powder feeding roller 3 rotatably disposed in the developing housing 1. The developing housing 1 is used to contain developer and includes a first housing 10a and a second housing 10b joined together. A receiving cavity 10 for containing developer is formed between the first housing 10a and the second housing 10b. The developing roller 2 is used to carry developer and supply developer to the outside of the developing cartridge 100. The powder feeding roller 3 contacts the developing roller 2 and is used to supply developer to the developing roller 2.

[0023] The developing cartridge 100 can be directly or indirectly installed in the imaging device in a detachable manner. For example, the developing cartridge 100 can be directly installed in the imaging device in a detachable manner, or the developing cartridge 100 can be first installed in a detachable manner into a drum housing with a photosensitive drum, which is used to form an electrostatic latent image on its surface. The developing roller 2 is arranged opposite to the photosensitive drum and supplies developer to the photosensitive drum to develop the electrostatic latent image. Then the combination of the developing cartridge 100 and the drum housing (which can also be called a "processing cartridge") is then installed in a detachable manner into the imaging device. However, the powder feeding roller 3 involved in this utility model is applicable regardless of how the developing cartridge 100 is installed.

[0024] Continue as Figure 1 , Figure 2 and Figure 3As shown, the developing cartridge 100 also includes a driving assembly 6 and a stirring frame 7 rotatably disposed in the developing housing 1. The driving assembly 6 is used to directly or indirectly transmit the driving force provided by the imaging device to at least one of the developing roller 2, the powder feeding roller 3, and the stirring frame 7, so as to drive the developing roller 2 to rotate around the first rotation axis L2, drive the powder feeding roller 3 to rotate around the second rotation axis L3, and drive the stirring frame 7 to rotate around the third rotation axis. The stirring frame 7 is disposed in the receiving cavity 10 and is used to stir the developer contained in the receiving cavity 10 to prevent it from clumping and to supply the developer to the powder feeding roller 3.

[0025] The extension direction of the first rotation axis L2 is defined as the first direction / longitudinal direction, the direction intersecting the first direction is defined as the second direction, and the direction intersecting both the first and second directions is defined as the third direction. Along the first direction, the driving component 6 is disposed at one end of the developing housing 1, and the end where the driving component 6 is disposed can be referred to as the driving end / left end, and vice versa as the non-driving end / right end. Along the second direction, the developing cartridge 100 is installed forward and removed backward, and the developing roller 2 is located at one end of the developing housing 1 and exposed forward. When the developing cartridge 100 is placed on a table, along the third direction, the direction of gravity of the developing cartridge 100 is downward, and vice versa as upward. The first rotation axis L2, the second rotation axis L3, and the third rotation axis are parallel to each other.

[0026] Continue as Figure 1 , Figure 2 and Figure 3 As shown, the developing housing 1 has a forward-facing opening 121. The developing roller 2 is rotatably disposed at the opening 121. The developing roller 2 separates the receiving cavity 10 from the outside. A receiving groove 123 is also formed on the inner wall 122 of the developing housing 1. The receiving groove 123 is used to receive a part of the powder feeding roller 3. Specifically, when viewed along the first direction, the inner surface (i.e., the inner wall 122) of the receiving groove 123 is arc-shaped. The inner surface (i.e., the inner wall 122) of the receiving groove 123 matches the outer circumferential surface of the powder feeding roller 3. Along the front-back direction / second direction, the receiving groove 123 is located behind the opening 121. The powder feeding roller 3 is closer to the stirring frame 7 than the developing roller 2. Furthermore, the developing roller 2 includes a developing roller shaft 21 extending along a first direction and a developing layer 22 covering the outer surface of the developing roller shaft 21. The powder feeding roller 3 includes a powder feeding roller shaft 31 extending along a first direction and a powder feeding layer 32 covering the outer surface of the powder feeding roller shaft 31. The developing layer 22 is in contact with the powder feeding layer 32. The powder feeding layer 32 is used to supply developer to the developing layer 22. The developing layer 22 is used to carry the developer. Furthermore, the developing layer 22 and the powder feeding layer 32 are elastic. Furthermore, no current flows between the powder feeding roller shaft 31 and the powder feeding layer 32, or in other words, the electrical connection / electrical contact between the powder feeding roller shaft 31 and the powder feeding layer 32 is disconnected.

[0027] The developing cartridge 100 also includes a powder dispensing blade 4 and a sealing member 125 disposed on the developing housing 1. A portion of the powder dispensing blade 4 is used to contact the developing roller 2. The powder dispensing blade 4 includes at least a blade 42. The blade 42 and the sealing member 125 are respectively in contact with the developing roller 2, specifically with the developing layer 22. Along a third direction, the blade 42 and the sealing member 125 are respectively located on both sides of the developing roller 2. Specifically, at least a portion of the blade 42 is located above the second rotation axis L2 of the developing roller 2, and the sealing member 125 is located below the second rotation axis L2. The powder dispensing blade 4 is used to distribute the developer carried on the surface of the developing roller 2 / developing layer 22 evenly, and is also used to seal the upper side of the opening 121. The sealing member 125 is used to seal the lower side of the opening 121 to prevent developer from leaking out of the opening 121. In some embodiments, the powder dispensing blade 4 also includes a blade holder 41, which is disposed on the developing housing 1, and the blade 42 is disposed on the blade holder 41.

[0028] In some embodiments, the developing layer 22 is made of a conductive material, and the outer surface of the powder feeding layer 32 is conductive / conductive. Preferably, the powder feeding layer 32 is made of a conductive material.

[0029] Continue as Figure 1 , Figure 2 and Figure 3 As shown, the developing cartridge 100 also includes a conductive member for receiving power from the power supply unit in the imaging device and supplying it to the developing roller 2 and / or the powder feeding roller 3. The conductive member is also used to contact an area other than the powder feeding roller shaft 31 to supply power to the powder feeding roller 3, and the conductive member does not contact the developing roller shaft 21. The conductive member includes one or two power receiving portions for electrical connection / contact with the power supply unit in the imaging device. Further, the conductive member includes at least a first conductive member 51 and a second conductive member 52, a portion of which is used for electrical connection / contact with the power supply unit. The second conductive element 52 supplies power directly or indirectly to the developing roller 2 and / or the powder feeding roller 3. A portion of the second conductive element 52 is used to electrically connect / contact with the first conductive element 51 and supply power to the powder feeding roller 3. Another portion of the second conductive element 52 is disposed in the receiving cavity 10 for contact with the powder feeding roller 3, preferably contacting an area other than the powder feeding roller shaft 31. For example, another portion of the second conductive element 52 contacts the powder feeding layer 32 of the powder feeding roller 3. Specifically, the conductive element / second conductive element 52 contacts the circumferential surface of the powder feeding layer 32, or the conductive element / second conductive element 52 contacts the longitudinal end face of the powder feeding layer 32.

[0030] Furthermore, the first conductive element 51 includes a power receiving part 511 and a first power output part 512. The power receiving part 511 is used to be electrically connected / in contact with the power supply element to receive power provided by the imaging device, and the first power output part 512 is used to be electrically connected / in contact with the second conductive element 52 to supply power to the powder feeding roller 3. The power receiving part 511 and the first power output part 512 are kept electrically connected / in contact. Preferably, the power receiving part 511 and the first power output part 512 are integrally formed.

[0031] Furthermore, the second conductive element 52 includes a power input section 521 and a third power output section 522. The power input section 521 is used for electrical connection / contact with the first conductive element 51, preferably with the first power output section 512. The third power output section 522 is used for electrical connection / contact with the powder feeding roller 3. Preferably, the third power output section 522 is used for electrical connection / contact with an area other than the powder feeding roller shaft 31, for example, with the powder feeding layer 32. It should be noted that the third power output section 522 does not contact the powder feeding roller shaft 31. Even during the rotation of the powder feeding roller 3, the second conductive element 52 can maintain a stable electrical connection / contact with an area other than the powder feeding roller shaft 31, thereby improving the safety performance of the developing cartridge 100. The power input section 521 and the third power output section 522 maintain electrical connection / contact. Preferably, the power input section 521 and the third power output section 522 are integrally formed.

[0032] In some embodiments, the first conductive element 51 and the second conductive element 52 are formed separately.

[0033] Further, preferably, along the first direction, the first conductive element 51 is disposed at the non-driving end / right end / conductive end. More preferably, the first conductive element 51 is fixedly mounted on the bracket 112 described below. The second conductive element 52 extends along the first direction. Specifically, the third power output part 522 is disposed on the inner wall 122 of the developing housing 1. More specifically, as one embodiment, the third power output part 522 is disposed in the receiving groove 123 for electrical connection / contact with areas other than the powder feeding roller shaft 31 (such as the powder feeding layer 32). More preferably, the third power output part 522 is attached to the inner surface of the receiving groove 123, so that the electrical connection / contact between the third power output part 522 and areas other than the powder feeding roller shaft 31 (such as the powder feeding layer 32) is more stable when the developing roller 2 and the powder feeding roller 3 rotate. In some embodiments, according to design requirements, the third power output part 522 can also be disposed in other positions, as long as it can achieve contact with areas other than the powder feeding roller shaft 31.

[0034] Compared to setting the third power output section 522 to be electrically connected / contacted with an area other than the developing roller shaft 21 (such as the developing layer 22), for example, supplying power to the developing roller 2 through the powder discharge blade 4, in this case, the third power output section 522 is the blade 42. The blade 42 is supported at only one end to form a cantilever. When the developing roller 2 rotates, the cantilevered third power output section 522 is prone to elastic deformation and is easily affected by the vibration of the developing roller 2, resulting in unstable electrical connection / contact. In addition, the cantilevered third power output section 522 is prone to fatigue after long-term deformation, thus reducing its service life.

[0035] In some embodiments, the second conductive element 52 may be omitted, and the first power output part 512 of the first conductive element 51 may be configured to be electrically connected / in contact with an area other than the powder feeding roller shaft 31. For example, the first power output part 512 may be directly electrically connected / in contact with the powder feeding layer 32 to supply power to the powder feeding roller 3. In this case, the second conductive element 52 coincides with the first power output part 512.

[0036] In some embodiments, the first conductive element 51 further includes a second power output section 513, which is used for electrical connection / contact with the powder dispensing blade 4, preferably with the blade holder 41. Power is supplied to the developing roller 2 by the powder dispensing blade 4 contacting an area other than the developing roller shaft 21 (such as the circumferential surface of the developing layer 22 or the longitudinal end face of the developing layer 22). The first power output section 512 and the second power output section 513 are located at opposite ends of the power receiving section 511. All three components are electrically connected / in contact with the power receiving unit 511. Preferably, the power receiving unit 511, the first power output unit 512, and the second power output unit 513 are integrally formed. The conductive component also includes a powder discharge blade 4, which is also used for electrical connection / contact with the developing roller 2. Specifically, the blade 42 is electrically connected / in contact with areas other than the developing roller shaft 21. For example, the blade 42 is electrically connected / in contact with the developing layer 22, and the blade holder 41 is electrically connected / in contact with the first conductive element 51, preferably with the second power output unit 513. In some embodiments, the blade 42 may also be directly mounted on the developing housing 1, and the second power output unit 513 of the first conductive element 51 is directly electrically connected / in contact with the blade 42.

[0037] In some embodiments, the conductive component includes at least a first conductive element 51 and a second conductive element 52. The first conductive element 51 includes a power receiving portion 511 and a first power output portion 512 that are electrically connected / contacted. The second conductive element 52 includes a power input portion 521 and a third power output portion 522 that are electrically connected / contacted. The power receiving portion 511 is used to electrically connect / contact with the power supply component, the first power output portion 512 is used to electrically connect / contact with the power input portion 521, and the third power output portion 522 is used to electrically connect / contact with an area other than the powder feeding roller shaft 31. For example, the third power output portion 522 is electrically connected / contacted with the powder feeding layer 32, thereby forming a conductive path from the power supply component to the first conductive element 51, the second conductive element 52, and the powder feeding roller 3 in sequence. In this embodiment, a portion of the second conductive element 52 is installed in the receiving groove 123 formed in the inner wall 122 of the developing housing 1 and is used to contact the area other than the powder feeding roller shaft 31 (such as the powder feeding layer 32), and a portion of the powder discharging blade 4 is used to contact the area other than the developing roller shaft 21 (such as the developing layer 22).

[0038] In some embodiments, the conductive component includes at least a first conductive element 51, a second conductive element 52, and a powder discharge blade 4. The first conductive element 51 includes a power receiving section 511, a first power output section 512, and a second power output section 513 that are electrically connected / contacted. The second conductive element 52 includes a power input section 521 and a third power output section 522 that are electrically connected / contacted. The power receiving section 511 is used for electrical connection / contact with the power supply component, the first power output section 512 is used for electrical connection / contact with the power input section 521, and the third power output section 522 is used for electrical connection / contact with the power input section 521. The output section 522 is used for electrical connection / contact with areas other than the powder feeding roller shaft 31. For example, the third power output section 522 is electrically connected / contacted with the powder feeding layer 32, and the second power output section 513 is used for electrical connection / contact with the powder dispensing blade 4. The powder dispensing blade 4 is electrically connected / contacted with areas other than the developing roller shaft 21 (such as the developing layer 22), thereby forming a conductive path from the power supply component to the first conductive component 51, the second conductive component 52, and the powder feeding roller 3, and a conductive path from the power supply component to the first conductive component 51, the powder dispensing blade 4, and the developing roller 2.

[0039] In some embodiments, the conductive component includes at least a second conductive element 52, which is additionally mounted on the developing housing 1. In one embodiment, a portion of the second conductive element 52 is mounted in a receiving groove 123 formed in the inner wall 122 of the developing housing 1. A portion of the second conductive element 52 is used to contact an area other than the powder feeding roller shaft 31 (such as the powder feeding layer 32). The second conductive element 52 includes an electrically connected / contacting power input portion 521 and a third power output portion 522. The power input portion 521 is used for direct or indirect electrical connection / contact with the power supply component, and the third power output portion 522 is used for electrical connection / contact with an area other than the powder feeding roller shaft 31 (such as the powder feeding layer 32), thereby forming a conductive path from the power supply component to the second conductive element 52 and the powder feeding roller 3. In this embodiment, a portion of the powder exiting blade 4 is used to contact an area other than the developing roller shaft 21 (such as the developing layer 22).

[0040] In some embodiments, the imaging device has two power supply units, and correspondingly, the developing cartridge 100 also has two power receiving units, which can be electrically connected / in contact with at least one of the two power supply units.

[0041] As shown in the figure, the developing cartridge 100 also includes an end cap 111 and a bracket 112 disposed at the end of the developing housing 1 along the first direction. Preferably, the end cap 111 is disposed at the driving end and is used to cover at least a portion of the driving assembly 6 to protect the driving assembly 6. Preferably, the bracket 112 is disposed at the non-driving end / right end / conductive end and can be used to support at least a portion of the first conductive member 51. Furthermore, the bracket 112 is provided with a through hole 1121 through which the power receiving part 511 is exposed so as to be electrically connected / in contact with the power supply member.

[0042] In some embodiments, the powder feeding roller shaft 31 of the powder feeding roller 3 is made of a non-conductive material.

[0043] In some embodiments, a non-conductive intermediate layer is provided between the powder feeding roller shaft 31 and the powder feeding layer 32; further, along the first direction, the length of the non-conductive intermediate layer is not shorter than the length of the powder feeding layer 32; further, the non-conductive intermediate layer may be a non-conductive coating applied to the outer surface of the powder feeding roller shaft 31, or a non-conductive coating applied to the inner surface of the powder feeding layer 32; further, the non-conductive intermediate layer may also be an isolation sleeve installed between the powder feeding roller shaft 31 and the powder feeding layer 32, the isolation sleeve being made of a non-conductive material. When multiple non-conductive intermediate layers / isolation sleeves are formed and spaced apart along the first direction, the length of each non-conductive intermediate layer / isolation sleeve along the first direction may be shorter than the length of the powder feeding layer along the first direction. When multiple non-conductive intermediate layers / isolation sleeves are formed and spaced apart along the circumferential direction, the length of each non-conductive intermediate layer / isolation sleeve is not limited.

[0044] As described above, the developing cartridge of this utility model is equipped with a second conductive element, which allows the second conductive element to be electrically connected / in contact with an area other than the powder feeding roller shaft (such as the powder feeding layer), without conducting electricity through the powder feeding roller shaft. In this way, the second conductive element can maintain a stable electrical connection / contact with the area other than the powder feeding roller shaft during the rotation of the powder feeding roller, thereby improving the safety performance of the developing cartridge.

Claims

1. A developing cartridge, detachably mounted to an imaging device equipped with a power supply, characterized in that, The developing cartridge includes: The developer housing is used to contain the developer. A developing roller is rotatably disposed in a developing housing and includes a developing roller shaft extending in a first direction and a developing layer covering the outer surface of the developing roller shaft. A powder feeding roller is rotatably disposed in a developing housing, including a powder feeding roller shaft extending in a first direction and a powder feeding layer covering the outer surface of the powder feeding roller shaft, the powder feeding layer being in contact with the developing layer; A conductive component is used to directly or indirectly connect / make electrical contact with the power supply component and to contact an area other than the powder feeding roller shaft to supply power to the powder feeding roller, and the conductive component does not contact the developing roller shaft; Along a second direction intersecting the first direction, the developing housing has a forward-facing opening, the developing roller is disposed in the opening, and a receiving groove is formed on the inner wall of the developing housing for accommodating a portion of the powder feeding roller, the powder feeding roller being in contact with the developing roller; Along the second direction, the receiving groove is located behind the opening.

2. The developing cartridge according to claim 1, characterized in that, The conductive component includes at least a first conductive element, which includes at least a power receiving part and a first power output part. The power receiving part is electrically connected / in contact with the first power output part. The power receiving part is also used to electrically connect / in contact with a power supply component to receive power provided by the imaging device. The first power output part is used to electrically connect / in contact with an area other than the powder feeding roller shaft to supply power to the powder feeding roller.

3. The developing cartridge according to claim 1, characterized in that, The conductive component includes a first conductive element and a second conductive element. The first conductive element is used to electrically connect the power supply component and the second conductive element. At least a portion of the second conductive element is disposed on the inner surface of the receiving groove.

4. The developing cartridge according to claim 1, characterized in that, The conductive component includes a first conductive element and a second conductive element, the second conductive element being separately formed from the first conductive element. A portion of the first conductive element is used for electrical connection / contact with the power supply component. The second conductive element includes a power input section and a third power output section, the power input section and the third power output section being electrically connected / contacted. The power input section is used for electrical connection / contact with the first conductive element, and the third power output section is used for electrical connection / contact with an area other than the powder feeding roller shaft.

5. The developing cartridge according to claim 1, characterized in that, The developing roller includes a developing roller shaft and a developing layer covering the outer surface of the developing roller shaft. The conductive component includes a first conductive element and a powder discharge blade disposed on the developing housing. A portion of the powder discharge blade is used to contact the developing layer. The first conductive element includes a power receiving part and a second power output part. The second power output part is electrically connected to the power receiving part. The power receiving part is used to be electrically connected / in contact with the power supply component to receive power provided by the imaging device. The second power output part is used to be electrically connected / in contact with the powder discharge blade to supply power to the developing roller.

6. The developing cartridge according to claim 1, characterized in that, The imaging device is provided with two power supply components, and the conductive component is electrically connected / in contact with at least one of the two power supply components.

7. A powder feeding roller, characterized in that, The powder feeding roller is suitable for the developing cartridge as described in any one of claims 1-6.

8. The powder feeding roller according to claim 7, characterized in that, The powder feeding roller shaft and the powder feeding layer are disconnected from electrical connection / contact, and the outer surface of the powder feeding layer is conductive.

9. The powder feeding roller according to claim 7, characterized in that, The powder feeding roller shaft is made of non-conductive material.

10. The powder feeding roller according to claim 7, characterized in that, A non-conductive intermediate layer is provided between the powder feeding roller shaft and the powder feeding layer.

11. The powder feeding roller according to claim 10, characterized in that, Along the first direction, the length of the non-conductive intermediate layer is not shorter than the length of the powder feeding layer, and the non-conductive intermediate layer is a non-conductive coating applied to the outer surface of the powder feeding roller shaft or coated on the inner surface of the powder feeding layer.

12. The powder feeding roller according to claim 10, characterized in that, The non-conductive intermediate layer is an isolation sleeve installed between the powder feeding roller shaft and the powder feeding layer, and the isolation sleeve is made of non-conductive material.

13. The powder feeding roller according to claim 12, characterized in that, When the isolation sleeves are formed as a plurality of spaced-apart sleeves along a first direction, the length of each isolation sleeve along the first direction is shorter than the length of the powder feeding layer along the first direction.

14. The powder feeding roller according to claim 12, characterized in that, The isolation sleeves are formed in multiple units spaced apart along the circumferential direction.

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