Developing cartridge

Abstract

The utility model relates to a developing box detachably mounted in a drum assembly, the drum assembly comprises a drum shell, a photosensitive drum and a forced pushing assembly, and one part of the drum shell is made of a conductive material; the developing box comprises a developing shell, a developing roller, a powder feeding roller and an acting assembly; a cavity capable of accommodating a developing agent is formed in the developing shell, the powder feeding roller is used for supplying the developing agent to the developing roller, and the developing roller is used for bearing the developing agent and supplying the developing agent to the photosensitive drum; at least one part of the forced pushing assembly is made of a conductive material, and when the developing box is mounted on the drum assembly, the forced pushing assembly is propped against the acting assembly; electric power output by the electric power output part is transmitted to the acting component through the drum shell and the forced pushing component in sequence, and the forced pushing component further applies forced pushing force for forcing the developing roller to keep contact with the photosensitive drum to the acting component; the acting assembly is used for supplying power to the developing roller and the powder feeding roller; the structure of the developing cartridge can be simplified.

Description

Technical Field

[0001] The utility model relates to the field of electronic photographic imaging, in particular to a developing box which is detachably installed in an electronic photographic imaging device. Background Art

[0002] A developing cartridge is a container that holds the developer required for imaging by an imaging device. Existing developing cartridges can be detachably installed in a drum assembly provided with a photosensitive drum; a developing roller is rotatably arranged in the developing cartridge. When the imaging device is imaging, the developing roller receives power from the power output member of the imaging device through a metal developing roller shaft. Under the action of the electric field force between the developing roller and the photosensitive drum, the developer carried by the developing roller reaches the surface of the photosensitive drum from the surface of the developing roller, thereby developing the electrostatic latent image formed on the surface of the photosensitive drum.

[0003] In order to prevent the developing roller shaft from contacting components other than the power output component and causing a short circuit in the developing roller, an insulating ring is provided on the developing roller shaft to protect the developing roller shaft. At the same time, the developing box is also provided with a conductive component for electrically connecting the developing roller shaft to the power output component. The conductive component maintains contact with the outer surface of the developing roller shaft, and the insulating ring is buckled with the conductive component.

[0004] Although the existing structure can stably hold the insulating ring, the insulating ring is engaged with the developer box shell by means of claws, which will cause the existing developer box to have a complex structure and be difficult to disassemble and assemble. In particular, when the existing developer box needs to be repaired or regenerated, the insulating ring is difficult to remove. Utility Model Content

[0005] To this end, the present invention provides a developer cartridge with the following technical solution, which protects the developing roller shaft while simplifying the structure of the developer cartridge. The specific solution is as follows:

[0006] The developing box is detachably mounted in the drum assembly, and the developing box and the drum assembly are detachably mounted together in an imaging device provided with an electric power output member, the drum assembly comprising a drum shell, a photosensitive drum and a pushing assembly, the drum shell being provided with a conductive portion, the photosensitive drum being rotatably disposed on the drum shell, and the pushing assembly being movably disposed on the drum shell; the developing box comprises a developing box, a developing roller, a powder feeding roller and an acting assembly; a cavity for accommodating a developer is formed in the developing box, the powder feeding roller is used to supply the developer toward the developing roller, and the developing roller is used to carry the developer and supply the developer toward the photosensitive drum; at least a portion of the pushing assembly is made of a conductive material, and when the developing box is mounted on the drum assembly, the pushing assembly abuts against the acting assembly; the power output by the electric power output member is sequentially transmitted to the acting assembly through the conductive portion and the pushing assembly, and the pushing assembly also applies a pushing force to the acting assembly to force the developing roller and the photosensitive drum to maintain contact; the acting assembly is used to supply power to the developing roller and the powder feeding roller; the structure of the developing box can be simplified.

[0007] Specifically, the developing roller rotates around a rotation axis extending along a first direction, and the developing roller includes a developing roller shaft and a developing layer, and the developing roller shaft passes through the developing layer; the acting component includes a bracket and an abutment portion protruding from the bracket, the bracket is used to support the developing roller and the powder feeding roller, and the abutment portion is used to receive at least a pushing force from the pushing component.

[0008] In some embodiments, the developing roller shaft protrudes from the bracket, and the insulating member is located radially outside the portion of the developing roller shaft protruding from the bracket.

[0009] In some embodiments, the bracket and the abutment are both made of a conductive material.

[0010] In some embodiments, the bracket and the abutment portion are both made of non-conductive materials, and the active component further includes a conductive member detachably mounted on the abutment portion, the conductive member being used to electrically connect to the pushing assembly, the developing roller and the powder feeding roller.

[0011] In some embodiments, the bracket is integrally formed with the developing housing.

[0012] In some embodiments, the developing roller shaft does not extend beyond the bracket, and the insulating member is formed to protrude from the developing housing.

[0013] In some embodiments, the insulating member is an insulating layer coated on the developing roller shaft.

[0014] In some embodiments, the diameter of the developer roller shaft extending beyond the bracket is larger than the diameter of the developer roller shaft not extending beyond the bracket.

[0015] In some embodiments, along the first direction, the insulating member is farther away from the developing housing than the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1AIt is a three-dimensional diagram of the developer box and the drum assembly in the processing box involved in the first embodiment of the present invention after being separated.

[0017] Figure 1B It is a three-dimensional diagram of the developing box involved in the first embodiment of the present utility model.

[0018] Figure 2 It is along Figure 1B Side view viewed from right to left after sectioning along the AA direction.

[0019] Figure 3 It is a three-dimensional diagram of the developing box involved in the second embodiment of the present utility model.

[0020] Figure 4 It is a three-dimensional diagram of the conductive end of the developer box involved in the third embodiment of the present invention.

[0021] Figure 5 It is a three-dimensional diagram of the conductive end of the developing box involved in the fourth embodiment of the present utility model. DETAILED DESCRIPTION

[0022] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0023] [Example 1]

[0024] Figure 1A This is a perspective view of a process cartridge according to a first embodiment of the present invention after the developing cartridge and the drum assembly are separated; Figure 1B This is a perspective view of a developing cartridge according to a first embodiment of the present invention; Figure 2 It is along Figure 1B Side view viewed from right to left after sectioning along the AA direction.

[0025] The processing box 100 includes a drum assembly 20 and a developer box 10 that are detachably coupled to each other, the drum assembly 20 includes a drum shell 2 and a photosensitive drum 21 rotatably arranged in the drum shell 2, and a developer box accommodating cavity 22 for accommodating the developer box 10 is formed in the drum shell 2; the developer box 10 includes a developer shell 1, a developer roller 11 rotatably arranged in the developer shell 1, and a powder feeding roller 15, a cavity for accommodating a developer is formed in the developer shell 1, and the powder feeding roller 15 is used to supply the developer to the developer roller 11, and the developer roller 11 rotates around the rotation axis L, is used to carry the developer, and supplies the developer to the photosensitive drum 21.

[0026] To describe the processing box more clearly, it is first defined that the length direction of the processing box 100 is the first direction, the width direction of the processing box 100 is the second direction, and the height direction of the processing box 100 is the third direction, wherein the rotation axis L is parallel to the first direction, and the first direction, the second direction and the third direction intersect. Preferably, the first direction, the second direction and the third direction are perpendicular to each other. hereinafter, the developing box 10 and the drum assembly 20 both have the same first direction, second direction and third direction as the processing box 100.

[0027] In the drum assembly 20, along the second direction, the photosensitive drum 21 is arranged at one end of the drum shell 2, and the developing box 10 is installed toward the developing box accommodating chamber 22 from the end where the photosensitive drum 21 is not arranged; in the developing box 10, along the second direction, the developing roller 11 is arranged at one end of the developing shell 1, when the developing box 10 is installed to the drum assembly 20, the developing roller 11 and the photosensitive drum 21 are close to each other, specifically, the developing roller 11 and the photosensitive drum 21 are in contact with each other.

[0028] Further, along the first direction, one end of the processing box 100 / drum assembly 20 / developing box 10 is used to receive power from the imaging device, and therefore, the end of the developing box 10 for receiving power is called the conductive end E, and the end opposite to the conductive end E is the non-conductive end F.

[0029] like Figure 1A As shown, the developing box 10 also includes a chip component 14 for establishing a communication connection with the imaging device, and the chip component 14 can be set at the conductive end E or the non-conductive end F, but along the third direction, the contact portion of the chip component 14 for contacting the contact pin in the imaging device (such as the gold finger on the chip) is facing in one direction. The figure shows that the chip component 14 is installed on the end cover 12 located at the non-conductive end F of the developing box, and the end cover 12 is fixedly connected to the developing shell 1; more specifically, hereinafter, with the developing box 10 as a reference, along the first direction, the conductive end E points to the non-conductive end F as the left, and the opposite is the right, along the second direction, the end where the developing roller 11 is provided points to the end where the developing roller 11 is not provided as the rear, and the opposite is the front, the developing box 10 is installed forward and taken out backward, and along the third direction, the contact portion faces upward and the contact portion faces back downward.

[0030] It should be understood that the contact portion refers to the component that ultimately contacts the contact pin. For example, based on the design requirements of the developer box 10 or other requirements, the orientation of the gold fingers set on the chip in the chip assembly 14 may change. At this time, a conductive material such as a conductive steel sheet needs to be provided in the chip assembly 14 to connect with the gold fingers, but the conductive material still needs to face upward to contact the contact pin. Accordingly, the conductive material can be regarded as the contact portion in the chip assembly.

[0031] In some embodiments, the developing cartridge 10 further includes a detection device for interacting with a detected component in the imaging device, so that various parameter information of the developing cartridge 10 can be known by the imaging device.

[0032] In some embodiments, the developing box 10 also includes a separation mechanism 13. When the processing box 100 no longer needs to form an image in the imaging device, the separation mechanism 13 receives a separation force from the imaging device, and the developing roller 11 and the photosensitive drum 21 move from a state close to each other to a state away from each other, so as to prevent the developing roller 11 from being deformed by long-term compression of the photosensitive drum 21, or the surface of the photosensitive drum 21 from being contaminated by the developer.

[0033] Along the first direction, the separation mechanism 13 and the chip assembly 14 can be arranged on the same side of the developing housing 1 , or respectively on two sides of the developing housing 1 .

[0034] like Figure 1A As shown, the drum assembly 20 also includes a pushing assembly movably arranged on the drum casing 2. When the developer box 10 is installed to the drum assembly 20, the pushing assembly applies a pushing force to the developer box 10, forcing the developer roller 11 and the photosensitive drum 21 to maintain contact. Specifically, the pushing assembly includes an elastic member 24 and a pushing member 25. One end of the elastic member 24 is connected to the drum casing 2, and the other end is connected to the pushing member 25. The elastic member 24 is used to apply the pushing force to the pushing member 25; further, the drum assembly 20 also includes a side plate 23 arranged at one end of the developer box accommodating chamber 22, and the side plate 23 is formed as a part of the drum casing 2. Along the first direction, the side plate 23 and the pushing assembly are arranged on the same side. Preferably, the side plate 23 and the pushing assembly are both arranged on the right side of the developer box accommodating chamber 22. In other embodiments, along the first direction, the two pushing assemblies are respectively arranged on both sides of the drum casing 2.

[0035] In this embodiment, a conductive part is provided on the drum shell 2, and at least a part of the pushing assembly is also made of conductive material. The conductive part is electrically connected to the pushing assembly. When the processing box 100 is installed to the imaging device in a detachable manner, the conductive part of the drum shell 2 receives electricity from the imaging device, and the electricity can be transmitted to the developing box through the pushing assembly.

[0036] Specifically, the elastic member 24 in the push assembly is electrically connected to the conductive part. Preferably, at least a portion of the side plate 23 is made of a conductive material to form a conductive part. The elastic member 24 is configured as a compression spring made of metal, and the push member 25 is made of a conductive material. The elastic member 24 can receive electricity by directly contacting the side plate 23, or the shell 2 connecting the elastic member 24 and the side plate 23 can be made of a conductive material to realize the transmission of electricity from the side plate 23 to the elastic member 24. Conductive material can also be installed between the elastic member 24 and the side plate 23 to realize the transmission of electricity from the side plate 23 to the elastic member 24.

[0037] like Figure 1A As shown, the developer housing 1 has a rightward-facing end surface 1a. In some embodiments, the separation mechanism 13 is located to the right of the end surface 1a. The developer cartridge 10 further includes an action component 3 and an insulating member 4. The action component 3 is configured to receive power and a thrust force, the power being simultaneously supplied to the developer roller 11 and / or the powder feed roller 15. The thrust force is configured to maintain contact between the developer roller 11 and the photosensitive drum 21. The insulating member 4 is disposed on the developer roller shaft 112 to prevent the developer roller 11 from electrically contacting components other than the action component 3, thereby causing the voltage carried by the developer roller 11 to change. Components other than the action component 3 may be a drum housing, an imaging device housing, or the like.

[0038] The developing roller 11 includes a developing roller shaft 112 and a developing layer 111, wherein the developing roller shaft 112 passes through the developing layer 111 along a first direction, and the developing layer 111 covers the outer circumference of the developing roller shaft 112 for carrying the developer. At the conductive end E, a portion of the developing roller shaft 112 is exposed to the outside of the developing layer 111. Similarly, the powder feeding roller 15 includes a powder feeding roller shaft 152 and a powder feeding layer 151. The powder feeding roller shaft 152 passes through the powder feeding layer 151 along the first direction, and the powder feeding layer 151 covers the outer circumference of the powder feeding roller shaft 152. At the conductive end E, a portion of the powder feeding roller shaft 152 is exposed to the outside of the powder feeding layer 151.

[0039] like Figure 1B As shown, at the conductive end E, the powder feeding roller shaft 152 and the developing roller shaft 112 are both arranged to exceed the end surface 1a; in this embodiment, the action component 3 is arranged as an integrally formed conductive member, including a main body 31, an abutting portion 32, a protruding portion 16, a first power transmission portion 33 and a second power transmission portion 34, and the main body 31 is positioned on the developing housing 1 through a positioning portion 35. Commonly, the positioning portion 35 and the developing housing 1 can be formed as a protrusion and a groove, or as a snap fit, or as a screw fit, etc. The abutting portion 32 is formed to protrude from the main body 31, and the abutting portion 32 is used to abut with the pushing component and receive electricity and the pushing force at the same time, so the abutting portion 32 It can be regarded as both an electric power receiving portion and a thrust receiving portion; the protrusion 16 is formed to protrude from the main body 31, and is used to cover at least a portion of the circumferential surface of the developing roller shaft 112 and / or the powder feeding roller shaft 152, and the first electric power transmission portion 33 and the second electric power transmission portion 34 are both support portions arranged on the main body 31. Specifically, the support portion is formed as a support hole or a support groove that can accommodate the developing roller shaft 112 and the powder feeding roller shaft 152, that is, the circumferential surface of the developing roller shaft 112 and the circumferential surface of the powder feeding roller shaft 152 receive electric power by contacting the acting component 3, and the main body 31 forming the support portion can also be regarded as a bracket for supporting the developing roller 11 and the powder feeding roller 15.

[0040] When the active component 3 is installed, the developing roller shaft 112 passes through the first power transmission part 33 and enters the protrusion 16. Along the first direction, the interior of the protrusion 16 coincides with the first power transmission part 33. In this embodiment, the protrusion 16 is formed integrally with the main body 31 and has conductivity. Therefore, the protrusion 16 can also be regarded as a part of the first power transmission part 33.

[0041] Along the first direction, the insulating member 4 is located to the right of the active component 3, specifically, the insulating member 4 is located to the right of the main body 31, so that the developing roller shaft 112 and the powder feeding roller shaft 152 can form a stable electrical connection with the main body 31, and at the same time, the two protrusions 16 are respectively sleeved on the parts of the developing roller 112 and the powder feeding roller shaft 152 that extend beyond the main body 31, and the insulating member 4 is sleeved on the protrusions 16, so that the developing roller shaft 112 and the powder feeding roller shaft 152 can be protected by the protrusions 16 and the insulating member 4, and the developing roller shaft 112 and the powder feeding roller shaft 152 will not generate electrical contact with components other than the active component 3, and the voltage carried by the two will not change; in practice, the length of the powder feeding roller shaft 152 is shorter than the length of the developing roller shaft 112, and only the protrusion 16 for protecting the developing roller shaft 112 needs to be provided in the developing box 10, and accordingly, only one insulating member 4 needs to be provided.

[0042] After the developing cartridge 10 is mounted to the drum assembly 20, as shown in FIG. Figure 2 As shown, the pushing member 25 abuts against the abutment portion 32, and the power output by the power output member in the imaging device is transmitted to the action component through the conductive portion on the drum shell and the pushing component. At the same time, the pushing component also applies a pushing force to the action component to force the developing roller 11 and the photosensitive drum 21 to maintain contact. Figure 1A and Figure 1B After the side plate 13 receives power from the imaging device, the power is transmitted to the abutment portion 32 through the elastic member 24 and the pushing member 25, and then transmitted to the main body 31 by the abutment portion 32. Finally, the power is transmitted to the developing roller shaft 112 and the powder feeding roller shaft 152 respectively by the first power transmission portion 33 and the second power transmission portion 34 provided on the main body 31.

[0043] Realistically, the conductive portion may be formed as a part of the side plate 23 / drum shell 2 , or may be a conductor mounted on the side plate 23 / drum shell 2 .

[0044] Continue as Figure 1A and Figure 2 As shown, the drum assembly 20 also includes a limiting portion 26 provided on the drum shell 2. When the developing box 10 is combined with the drum assembly 20, the insulating member 4 abuts against the limiting portion 26 so that the developing box 10 is limited in the drum assembly 20, preventing the pushing force applied by the pushing assembly from being too large, causing the developing roller 11 and the photosensitive drum to be in too tight contact, thereby ensuring that a suitable contact force is formed between the developing roller 11 and the photosensitive drum 21.

[0045] In this embodiment, the acting component 3 is formed integrally, the insulating member 4 is formed separately from the acting component 3, and the insulating member 4 is located to the right of the acting component 3 (main body 31). Along the first direction, the insulating member 4 is farther away from the developing housing 1 than the acting component 3 (main body / bracket 31). Therefore, the acting component 3 and the insulating member 4 can be more easily installed and disassembled, and the structure of the developing box 10 can be simplified.

[0046] In a variation, the insulating member 4 can also be formed by an insulating coating coated on the surface of the protrusion 16. In this embodiment, the installation and removal steps of the insulating member 4 can be eliminated. In any case, the insulating member 4 in this embodiment is always located radially outside the developing roller shaft 112. More specifically, the protrusion 16 contacts the developing roller shaft 112 and is located radially outside the developing roller shaft 112. The insulating member 4 is located radially outside the protrusion 16, that is, the insulating member 4 is located radially outside the portion of the developing roller shaft 112 that extends beyond the bracket.

[0047] [Example 2]

[0048] Figure 3 It is a three-dimensional diagram of the developing box involved in the second embodiment of the present utility model.

[0049] Different from the first embodiment, the acting component 3 in this embodiment is only partially made of conductive material. As shown in the figure, the acting component 3 includes a main body 31, an abutting portion 32 and a conductive member 36, wherein the abutting portion 32 is formed by protruding from the main body 31, and the conductive member 36 is detachably mounted on the abutting portion 32. The main body 31 is formed separately from the developing shell 1. All or part of the protrusion 16 in the first embodiment is replaced by the insulating member 4. Therefore, the main body 31, the abutting portion 32 and the insulating member 4 can all be made of non-conductive material, which is beneficial to reducing the material cost of the developing box 10. The abutting portion 32 does not receive electricity and is only used to receive the forced thrust and can be regarded as a forced thrust receiving portion.

[0050] In this embodiment, the insulating member 4 is in direct contact with the developing roller shaft 112 , and thus, the insulating member 4 is located radially outside the developing roller shaft 112 . Specifically, the insulating member 4 is located radially outside the portion of the developing roller shaft 112 that extends beyond the bracket.

[0051] In some embodiments, the insulating member 4 may not be formed to protrude from the main body 31 , but similar to the first embodiment, the insulating member 4 and the main body 31 may be formed separately.

[0052] The conductive member 36 is made of a conductive material, and includes a base 361 and a power receiving portion 364, a first power transmission portion 362 and a second power transmission portion 363 connected to the base 361. The conductive member 36 can be fixed on the developing shell 1 / main body 31 / abutment portion 32 through at least any one of the base 361, the power receiving portion 364, the first power transmission portion 362 and the second power transmission portion 363. In the direction in which the pushing member 25 applies the pushing force, the power receiving portion 364 at least partially overlaps with the abutment portion 32. In this way, after the developing box 10 is installed to the drum assembly 20, the pushing assembly abuts with the power receiving portion 364, so that the abutment portion 32 indirectly abuts with the pushing assembly. Therefore, the abutment portion 32 receives the pushing force from the pushing assembly, and the power receiving portion 364 receives power from the pushing assembly.

[0053] The power received by the power receiving part 364 is supplied to the first power transmission part 362 and the second power transmission part 363 through the base 361 respectively. The first power transmission part 362 is used to contact the developing roller shaft 112 and supply power to the developing roller shaft 112, and the second power transmission part 363 is used to contact the powder feeding roller shaft 152 and supply power to the powder feeding roller shaft 152.

[0054] The conductive part 36 is located to the right of the main body 31, or in other words, along the first direction, the conductive part 36 is farther away from the developing housing 1 than the main body 31. The insulating part 4 and the conductive part 36 do not interfere with each other, making it easier to install and disassemble. This structure can also simplify the structure of the developing box 10.

[0055] [Example 3]

[0056] Figure 4 It is a three-dimensional diagram of the conductive end of the developer box involved in the third embodiment of the present invention.

[0057] Different from the second embodiment, the main body 31 in this embodiment is formed integrally with the developer housing 1. Therefore, the abutment portion 32 is still formed to protrude to the right from the main body 31 and can be regarded as a part of the developer housing 1. At this time, the conductive member 36 can be regarded as being detachably connected to the developer housing 1.

[0058] The other structures of the active component in this embodiment are the same as those in the second embodiment and will not be repeated here. Since the main body 31 in this embodiment is formed integrally with the developing shell 1, the active component in this embodiment only needs to install the conductive part 36, so the structure of the developing box 10 is also simplified.

[0059] [Example 4]

[0060] Figure 5 It is a three-dimensional diagram of the conductive end of the developing box involved in the fourth embodiment of the present utility model.

[0061] Based on Example 1, this embodiment sets the insulating part 4 to be formed integrally with the developing housing 1. Specifically, the insulating part 4 is set to be a protrusion 16 protruding to the right from the end surface 1a. In this way, the installation step of the insulating part 4 can be omitted. At the same time, the protrusion 16 can also serve as the limited part of the developing box 10, which is used to abut against the limiting part 26.

[0062] Specifically, along the circumferential direction of the developing roller shaft 112, the protrusion 16 in this embodiment only covers a portion of the developing roller shaft 112. Along the front-to-back direction, at least a portion of the protrusion 16 is located in front of the developing roller shaft 112, and the protrusion 16 is located radially outside the developing roller shaft 112. When the main body 31 is installed, the protrusion 16 and the first power transmission portion 33 cover the developing roller shaft 112 in the entire circumferential direction. In this structure, during the installation process of the main body 31, the protrusion 16 can also guide the main body 31, so that the main body 31 can be installed more smoothly and accurately.

[0063] Furthermore, the developing roller shaft 112 is shortened, and when the main body 31 is installed, the developing roller shaft 112 does not extend beyond the protrusion 16 along the first direction. Preferably, the developing roller shaft 112 does not extend beyond the main body 31. On the one hand, the risk of the developing roller shaft 112 forming an electrical connection with components other than the active component 3 is reduced. On the other hand, the material cost of the developing roller shaft 112 can be reduced.

[0064] In some embodiments, along the first direction, the protrusion 16 may not exceed the main body 31 . In this case, the limited portion may be additionally provided on the main body 31 .

[0065] [Example 5]

[0066] This embodiment is also a variation of the first embodiment. In the first embodiment, the insulating member 4 is an independent component formed separately from the main body 31 and is sleeved on the developing roller shaft 112. In this embodiment, the insulating member 4 is still formed separately from the main body 31. The difference is that the insulating member 4 in this embodiment is an insulating layer coated on the outer surface of the developing roller shaft 112. For example, the developing roller shaft 112 is coated by immersing it in a liquid containing an insulating material, or the insulating material is sprayed on the surface of the developing roller shaft 112 by spraying. The insulating member 4 is still located radially outside the developing roller shaft 112. Specifically, the insulating member 4 is located radially outside the portion of the developing roller shaft 112 that extends beyond the bracket.

[0067] By coating the insulating member 4 on the outer surface of the developing roller shaft 112, the steps of installing and removing the insulating member 4 can be omitted; in some embodiments, further, the diameter of the developing roller shaft 112 is increased so that the developing roller shaft 112 coated with the insulating member 4 can abut against the limiting portion 26. Preferably, it is only necessary to increase the diameter of the developing roller shaft 112 that exceeds the main body 31, that is, along the first direction, the diameter of the developing roller shaft 112 that exceeds the main body 31 (the developing roller shaft 112 located to the right of the main body 31) is larger than the diameter of the developing roller shaft 112 that does not exceed the main body 31.

Claims

1. A developing cartridge detachably mounted in a drum assembly, wherein the developing cartridge and the drum assembly are detachably mounted to a drum assembly provided with an electric In the imaging device of the output, The drum assembly includes a drum shell, a photosensitive drum and a forced pushing assembly. The drum shell is provided with a conductive portion. The photosensitive drum is rotatably arranged on the drum shell. The forced pushing assembly is movably arranged on the drum shell. The developing box includes a developing shell, a developing roller, a powder feeding roller and an action component; A cavity for accommodating a developer is formed in the developing housing, the powder feeding roller is used to supply the developer to the developing roller, and the developing roller is used to carry the developer and supply the developer to the photosensitive drum; It is characterized in that At least a portion of the pushing assembly is made of a conductive material, and when the developing cartridge is mounted to the drum assembly, the pushing assembly abuts against the acting assembly; The power output by the power output member is transmitted to the acting component through the conductive portion and the pushing component in sequence, and the pushing component also applies a pushing force to the acting component to force the developing roller and the photosensitive drum to maintain contact; The active component is used to supply power to the developing roller and the powder feed roller.

2. The developing cartridge according to claim 1, wherein The action component is arranged at one end of the developing box, and Connected to the developing roller and / or the powder feeding roller, the action component is used to receive the power of the power output member and supply the power to the developing roller and / or the powder feeding roller; the developing box also includes: An insulating member is located farther from the developing housing than the active component along the length direction of the developing box, and the insulating member is connected to the developing roller and / or the powder feeding roller.

3. The developing cartridge according to claim 2, wherein: The acting component includes a main body, an abutment portion and a conductive member, the insulating member and the abutment portion are protruding from the main body, and the conductive member is detachably mounted on the abutment portion, wherein the conductive member is used to receive the power of the power output member and supply the power to the developing roller and / or the powder feeding roller; and when the developing cartridge is mounted on the drum assembly, the abutment portion is used to receive the power of the pushing assembly to force the developing roller The pushing force that maintains contact with the photosensitive drum.

4. The developing cartridge according to claim 3, wherein: The conductive member includes a base and a power receiving portion, a first power transmitting portion and / or a second power transmitting portion connected to the base, wherein the power receiving portion is used to receive power from the power output member, and the base is used to supply power to the first power transmitting portion and / or the second power transmitting portion. The first power transmission portion is used to contact the developing roller shaft and supply power to the developing roller shaft, and the second power transmission portion is used to contact the powder feeding roller shaft and supply power to the powder feeding roller shaft.

5. The developing cartridge according to claim 4, wherein: In the direction in which the urging force is applied by the urging assembly, the electric-power receiving portion at least partially overlaps with the abutting portion.

6. The developing cartridge according to claim 3, wherein: In the length direction of the developing box, the conductive member is arranged on a side of the main body away from the developing housing.

7. The developing cartridge according to claim 3, wherein: The main body and the developing housing are integrally formed.

8. The developing cartridge according to claim 3, wherein: The main body portion, and / or the abutting portion, and / or the insulating member are made of a non-conductive material.

9. The developing cartridge according to claim 2, wherein: The drum assembly further includes a limiting portion provided on the drum housing, wherein, after the developing cartridge is combined with the drum assembly, the insulating member abuts against the limiting portion so that the developing cartridge is limited in position in the drum assembly.

10. The developing cartridge according to claim 2, wherein: The insulating member is an insulating layer coated on the outer surface of the developing roller shaft.

11. The developing cartridge according to claim 2, wherein: The insulating member is formed integrally with the developing housing.

12. The developing cartridge according to claim 4, wherein: The developing housing has an end surface facing to the right, and the insulating member is configured as a protrusion protruding from the end surface toward the acting component. In the width direction of the developing box, at least a portion of the protrusion is located in front of the developing roller shaft, and the protrusion is located radially outside the developing roller shaft. The acting component includes a first power transmission part, and the protrusion and the first power transmission part cover the developing roller shaft in the entire circumferential direction.

13. The developing cartridge according to claim 12, wherein: In the length direction of the developing box, the developing roller shaft does not exceed the protrusion or the acting component; and / or the protrusion does not exceed the acting component.

Images