Developing roller, developing cartridge, and process cartridge

Abstract

The developing roller provided by the utility model includes a developing roller shaft, the developing roller can rotate around a rotation axis parallel to the first direction, the developing roller shaft has a driving end part and a non-driving end part which are oppositely arranged at intervals, the driving end part is used for cooperating with a developing roller driving gear to receive a driving force; the developing roller driving gear includes a first cut part which is formed into a containing hole for containing at least a part of the driving end part, a first reserved part which is formed into a cooperation part for mutually cooperating with the driving end part, the cooperation part has a cooperation face and a sub-cooperation part formed on the cooperation face; the driving end part includes a second cut part and a second reserved part which is formed into a matched part capable of entering the containing hole and is used for cooperating with the cooperation part, the matched part has a matched face and a sub-matched part formed on the matched face; during transmission of the driving force, a key groove cooperation is formed between the sub-matched part and the sub-cooperation part, so that the transmission of the driving force can be ensured to be stable.

Description

Technical Field

[0001] This utility model relates to electrophotographic imaging technology, and more particularly to a developing cartridge that can be detachably installed to an electrophotographic imaging device, a developing roller that can be rotatably disposed in the developing cartridge, and a processing cartridge having the developing cartridge. Background Technology

[0002] A developing cartridge is a printing consumable that can be detachably installed into an imaging device. The developing cartridge includes a developing housing and a developing roller rotatably disposed in the developing housing. The developing roller is used to supply toner contained in the developing housing to a photosensitive drum arranged opposite to the developing roller. The developing cartridge also includes a driving force receiving element for receiving driving force from the imaging device and a driving force transmitting element for transmitting driving force, which is used to directly or indirectly drive the developing roller to rotate.

[0003] The developing roller includes a developing roller shaft and a developing roller layer disposed radially outside the developing roller shaft. The developing cartridge also includes a developing roller drive gear for receiving driving force from a driving force transmission component to drive the developing roller to rotate. Specifically, the developing roller can be driven by the driving force through the mutual cooperation between the D-shaped engagement portion disposed on the developing roller drive gear and the D-shaped engagement portion disposed on the developing roller shaft. However, how to ensure a stable cooperation between the D-shaped engagement portion and the D-shaped engagement portion is a research and development direction that needs to be considered. Utility Model Content

[0004] This utility model provides a developing roller, a developing cartridge having the developing roller, and a processing cartridge having the developing cartridge, which solves at least one of the above-mentioned technical problems. The specific technical solution is as follows:

[0005] The developing roller includes a developing roller shaft and a developing roller layer located radially outside the developing roller shaft. The developing roller is rotatable about a rotation axis parallel to a first direction. Along the first direction, the developing roller shaft has a driving end and a non-driving end that are spaced apart and opposite to each other. The developing roller layer is located between the driving end and the non-driving end. The driving end is used to cooperate with a coaxially arranged developing roller driving gear to receive a driving force for driving the developing roller to rotate.

[0006] The developing roller drive gear includes at least a portion of a drive gear body supported by the driven end, and the drive gear body includes:

[0007] The first cut portion is formed into a receiving hole for accommodating at least a portion of the drive end, and at least a portion of the receiving hole extends through in a first direction;

[0008] The first reserved portion is formed as a mating part for cooperating with the drive end. The mating part has a mating surface and a sub-matting part formed on the mating surface. The mating surface is planar and faces the axis of rotation.

[0009] The driving end includes:

[0010] The second part to be cut;

[0011] The second reserved portion is formed as a mating portion that can enter the receiving hole and is used to mate with the mating portion. Along the first direction, the rotation axis passes through the mating portion. The mating portion has a mating surface and a sub-matting portion formed on the mating surface. The mating surface is planar and faces away from the rotation axis.

[0012] During the transmission of driving force, the mating surface is used to cooperate with the mating surface, and a keyway fit is formed between the sub-matting part and the sub-mating part.

[0013] Along the radial direction of the drive gear body, the sub-mate is formed by protruding or recessing from the mate surface, and along the radial direction of the drive end, the sub-mate is formed by recessing or protruding from the mate surface.

[0014] Viewed along the first direction, the mating surface is formed as a straight line, and the surface of the first cut portion facing the axis of rotation is formed as a curve.

[0015] Viewed along the first direction, the mating surface is formed as a straight line, and the surface of the second retained portion facing the axis of rotation is formed as a curve.

[0016] In the drive end, along the radial direction of the developing roller shaft / drive end, the size of the second cut portion is greater than one-sixth of the size of the drive end.

[0017] In the drive end, along the radial direction of the developing roller shaft / drive end, the size of the second cut portion is less than one-third of the size of the drive end.

[0018] Along the first direction, the end of the drive end away from the longitudinal center of the developing roller is rounded.

[0019] The developing roller is also provided with at least one stop for preventing the developing roller from moving in a first direction, wherein the stop is located at at least one of the two ends of the developing roller layer in the first direction.

[0020] The developing cartridge includes a developing housing and a developing roller, which is rotatably disposed in the developing housing and is used to supply toner carried by the developing housing to the outside of the developing cartridge.

[0021] The processing box includes a drum box and a developing box, which are combined with each other. The drum box includes a drum housing and a photosensitive drum rotatably disposed in the drum housing. The developing roller is arranged opposite to the photosensitive drum. The surface of the photosensitive drum is used to form an electrostatic latent image. The developing roller in the developing box is used to supply toner to the photosensitive drum so that the electrostatic latent image is developed.

[0022] Compared with the prior art, the developing roller drive gear is provided with a mating part, the developing roller shaft is provided with a mating part, the mating part is provided with a mating surface, and the mating part is provided with a mating surface. Through the mutual cooperation between the mating surface and the mating surface, the driving force can be transmitted from the developing roller drive gear to the developing roller shaft, and the developing roller can be driven to rotate by the driving force. Furthermore, the mating part is provided with a sub-matting part, and the mating part is provided with a sub-matting part. The sub-matting part and the sub-matting part form a keyway cooperation. With this arrangement, it can not only ensure that the driving force can be stably transmitted, but also prevent the mating part and the mating part from separating from each other during the transmission of the driving force, thus affecting the transmission of the driving force. Attached Figure Description

[0023] Figure 1 This is a perspective view of a developing roller according to Embodiment 1 of this utility model.

[0024] Figure 2 This is a perspective view of the developing roller and the developing roller drive gear involved in Embodiment 1 of this utility model after they are engaged with each other.

[0025] Figure 3 This is a perspective view of the developing roller drive gear according to Embodiment 1 of this utility model.

[0026] Figure 4 This is a perspective view of another developing roller according to Embodiment 1 of this utility model.

[0027] Figure 5 It is along Figure 4 A plan view of a developing roller according to Embodiment 1 of this utility model, cut along the AA direction.

[0028] Figure 6 This is a plan view of a developing roller drive gear according to Embodiment 1 of this utility model, viewed along the first direction.

[0029] Figure 7 It is along Figure 4 A plan view of another developing roller according to Embodiment 1 of this utility model, cut along the AA direction.

[0030] Figure 8 This is a plan view of another developing roller drive gear according to Embodiment 1 of this utility model, viewed along the first direction.

[0031] Figure 9 This is a plan view of the developing roller involved in Embodiment 2 of this utility model, viewed along the first direction. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0033] [Example 1]

[0034] Figure 1 This is a perspective view of a developing roller according to Embodiment 1 of this utility model; Figure 2 This is a perspective view of the developing roller and the developing roller drive gear involved in Embodiment 1 of this utility model after they are engaged with each other.

[0035] The developing cartridge (not shown) can be detachably installed into the imaging device. The developing cartridge includes a developing housing and a developing roller rotatably disposed in the developing housing. The developing roller 1 is used to supply toner contained in the developing housing to the outside of the developing cartridge. For example, the developing roller 1 supplies toner to a photosensitive drum arranged opposite to it, so that the electrostatic latent image formed on the photosensitive drum is developed. The direction parallel to the rotation axis L of the developing roller 1 is the first direction / longitudinal direction.

[0036] like Figure 1 and Figure 2 As shown, the developing roller 1 includes a developing roller shaft 11 and a developing roller layer 12 located radially outside the developing roller shaft 11. The developing roller layer 12 is used to carry toner. Along the first direction, the developing roller shaft 11 has a driving end 11a and a non-driving end 11b that are spaced apart and opposite to each other. Along the first direction, the developing roller layer 12 is located between the driving end 11a and the non-driving end 11b.

[0037] The developing cartridge 10 also includes a driving force receiver, a driving force transmitter, and a developing roller drive gear 2 (such as...). Figure 2 As shown), the driving force receiver is used to receive driving force from the imaging device, the driving force transmitter is used to transmit the driving force received by the driving force receiver, and the developing roller drive gear 2 is used to receive driving force from the driving force transmitter and transmit the driving force to the developing roller shaft 11, so that the developing roller 1 is driven to rotate. Along the first direction, the driving end 11a, the driving force receiver, the driving force transmitter and the developing roller drive gear 2 are arranged on the same side.

[0038] In some embodiments, the driving force transmission element is configured as a gear system or gear assembly.

[0039] Figure 3 This is a perspective view of the developing roller drive gear according to Embodiment 1 of this utility model.

[0040] like Figure 2 and Figure 3 As shown, the developing roller drive gear 2 includes a drive gear body 21 and a drive force transmission part 22 arranged along the circumferential direction of the drive gear body 21. At least a portion of the developing roller drive gear 2 / drive gear body 21 is supported by the developing roller shaft 11 / drive end 11a. Along the first direction, the drive gear body 21 has a first end 21a and a second end 21b, with the first end 21a being further away from the developing roller layer 12 than the second end 21b.

[0041] The drive gear body 21 has a receiving hole that extends through the first direction. The drive gear body 21 includes a first cut portion 21a1 and a first retained portion 21a2. Generally, the drive gear body 21 is cylindrical. By cutting the drive gear body 21 from the side where the first end 21a is located along the first direction, the first cut portion 21a1 and the first retained portion 21a2 can be obtained. When viewed along the first direction, the first end 21a is D-shaped. The first cut portion 21a1 is formed as the receiving hole for accommodating at least a portion of the drive end 11a. At least a portion of the receiving hole extends through the first direction.

[0042] The first retained portion 21a2 is formed as a mating part for cooperating with the drive end 11a. The mating part 21a2 has a mating surface 21a3 facing the rotation axis L. The mating surface 21a3 is a plane. When viewed along the first direction, the mating surface 21a3 is formed as a straight line. The surface of the first cut portion 21a1 facing the rotation axis L is formed as a curve. That is, the surface of the first cut portion 21a1 facing the rotation axis L is a curved surface. Along the radial direction of the drive gear body 21, the mating part 21a2 is also provided with a sub-matting part 21a4 that protrudes or is recessed from the mating surface 21a3.

[0043] Figure 4 This is a perspective view of another developing roller according to Embodiment 1 of this utility model.

[0044] In some embodiments, the driving force transmission unit 22 is configured as a helical gear or a spur gear.

[0045] like Figure 1 and Figure 4 As shown, the drive end 11a includes a second cut portion 11a1 and a second retention portion 11a2. Generally, the drive end 11a is columnar. The drive end 11a is cut along the first direction from the side of the drive end 11a away from the center of the developing roller layer 12 to obtain the second cut portion 11a1 and the second retention portion 11a2. The second retention portion 11a2 is formed as a mating part that can enter the first cut portion 21a1 and mate with the first retention portion 21a2. When viewed along the first direction, the second retention portion 11a2 is D-shaped.

[0046] Figure 5 It is along Figure 4 A plan view of a developing roller according to Embodiment 1 of this utility model, cut along the AA direction; Figure 6 This is a plan view of a developing roller drive gear according to Embodiment 1 of this utility model, viewed along the first direction; Figure 7 It is along Figure 4A plan view of another developing roller according to Embodiment 1 of this utility model, cut along the AA direction; Figure 8 This is a plan view of another developing roller drive gear according to Embodiment 1 of this utility model, viewed along the first direction.

[0047] like Figure 4 As shown, along the first direction, the rotation axis L passes through the mating part 11a2. The mating part 11a2 has a mating surface 11a3 facing away from the rotation axis L. The mating surface 11a3 is planar. Viewed along the first direction, the mating surface 11a3 forms a straight line, and the surface of the second reserved part 11a2 / matting part 11a2 facing the rotation axis L forms a curve. That is, the surface of the second reserved part 11a2 / matting part 11a2 facing the rotation axis L is a curved surface. Along the radial direction of the driving end 11a, the mating part 11a2 is also provided with a sub-matting part 11a4 formed by recessing or protruding from the mating surface 11a3. A keyway fit is formed between the sub-matting part 11a4 and the sub-matting part 21a4. Specifically, as shown... Figure 5 and Figure 6 As shown, along the radial direction of the drive gear body 21, when the sub-fitting portion 21a4 protrudes from the mating surface 21a3, the sub-fitted portion 11a4 is recessed from the mated surface 11a3 along the radial direction of the drive end 11a; or, as... Figure 7 and Figure 8 As shown, along the radial direction of the drive gear body 21, when the sub-fitting part 21a4 is recessed from the mating surface 21a3, the sub-fitted part 11a4 protrudes from the mated surface 11a3 along the radial direction of the drive end 11a; that is, the sub-fitted part 11a4 and the sub-fitting part 21a4 can be interchanged.

[0048] In some embodiments, the developing roller drive gear 2 is coaxially arranged with the developing roller shaft 11 / drive end 11a. When the developing roller drive gear 2 is installed on the developing roller shaft 1, the radial direction of the drive gear body 21 and the radial direction of the drive end 11a can be regarded as the same direction.

[0049] During the transmission of driving force, through the mutual cooperation between the mating surface 11a3 and the mating surface 21a3, the driving force is transmitted from the developing roller drive gear 2 to the developing roller shaft 11 / driving end 11a, so that the developing roller 1 is driven to rotate.

[0050] In some implementations, such as Figure 1 As shown, along the first direction, the end of the drive end 11a away from the longitudinal center of the developing roller 1 is rounded.

[0051] In some implementations, such as Figure 1 and Figure 2As shown, the developing roller 1 is also provided with at least one stop 3 for preventing the developing roller 1 from moving along the first direction. Along the first direction, the stop 3 is located at at least one of the two ends of the developing roller layer 12. The stop 3 is used to abut against the end cap of the developing housing or the developing box or the bracket in the developing box used to support the developing roller 1. In this way, the image quality degradation caused by the movement of the developing roller 1 along the first direction can be avoided when the imaging device is performing imaging.

[0052] [Example 2]

[0053] This embodiment describes the differences from Embodiment 1.

[0054] Figure 9 This is a plan view of the developing roller involved in Embodiment 2 of this utility model, viewed along the first direction.

[0055] like Figure 9 As shown, along the radial direction of the developing roller 11 / driving end 11a, the driving end 11a has a first dimension d1, the second cut portion 11a1 has a second dimension d2, and the second retained portion 11a2 / fitted portion 11a2 has a third dimension d3, where d1 = d3 + d2. Specifically, d2 > d1 * 1 / 6, and in some preferred embodiments, d2 > 1 mm. This can prevent damage to the developing roller driving gear 2 and also prevent the developing roller driving gear 2 from idling relative to the developing roller shaft 11 / driving end 11a, so that the driving force cannot be transmitted to the developing roller shaft 11.

[0056] Furthermore, d2 < d1 * 1 / 3, and in some preferred embodiments, d2 < 2 mm; in this way, the deformation of the developing roller 11 under stress can be avoided due to the reduced strength of the developing roller 11.

[0057] In some preferred embodiments, d1 = 6 mm, d2 > 1 mm, and d2 < 2 mm, for example: the second dimension d2 = 1.1 mm, 1.5 mm, or 1.9 mm.

[0058] The present invention also provides a processing box including the above-mentioned developing box, wherein the developing box is detachably installed into the processing box, and the processing box further includes a drum box for being combined with the developing box. The drum box includes a drum housing and a photosensitive drum rotatably disposed in the drum housing. The surface of the photosensitive drum is used to form an electrostatic latent image. The developing roller 1 is arranged opposite to the photosensitive drum and is used to supply toner to the photosensitive drum so that the electrostatic latent image is developed.

[0059] [Beneficial Effects]

[0060] Compared with the prior art, the developing roller 1, the developing cassette having the developing roller 1, and the processing cassette having the developing cassette provided by this utility model have the following beneficial effects:

[0061] In the first aspect, the developing roller drive gear 2 is provided with a mating part 21a2, the developing roller shaft 11 is provided with a mated part 11a2, the mating part 21a2 is provided with a mating surface 21a3, and the mated part 11a2 is provided with a mated surface 11a3. Through the mutual cooperation between the mating surface 21a3 and the mated surface 11a3, the driving force can be transmitted from the developing roller drive gear 2 to the developing roller shaft 11, and the developing roller 1 can be driven to rotate by the driving force.

[0062] Furthermore, the mating part 21a2 is provided with a sub-matting part 21a4, and the mated part 11a2 is provided with a sub-matted part 11a4. The sub-matted part 11a4 and the sub-matting part 21a4 form a keyway fit. With this arrangement, it can be ensured that the driving force can be transmitted stably, and it can also prevent the mating part 21a2 and the mated part 11a2 from separating from each other during the transmission of the driving force, thus affecting the transmission of the driving force.

[0063] Secondly, in the driving end 11a, along the radial direction of the developing roller 11, the driving end 11a has a first dimension d1, and the second cut portion 11a1 has a second dimension d2, where d2 > d1 * 1 / 6. With this arrangement, during the transmission of driving force, damage to the developing roller driving gear 2 can be prevented, and the situation where the developing roller driving gear 2 rotates idly relative to the developing roller shaft 11 / driving end 11a, and the driving force cannot be transmitted to the developing roller shaft 11, can also be avoided.

[0064] Thirdly, in the drive end 11a, d2 < d1 * 1 / 3. This prevents the strength of the developing roller shaft 11 from decreasing, thus avoiding deformation of the developing roller shaft 11 after being subjected to force, thereby ensuring that the driving force can be transmitted stably.

Claims

1. A developing roller, including a developing roller shaft and a developing roller layer located radially outside the developing roller shaft, the developing roller being rotatable about a rotation axis parallel to a first direction, the developing roller shaft having a drive end and a non-drive end spaced apart and opposite to each other along the first direction, the developing roller layer being located between the drive end and the non-drive end, the drive end being used to cooperate with a coaxially arranged developing roller drive gear to receive a driving force for driving the developing roller to rotate; Its features are, The developing roller drive gear includes at least a portion of a drive gear body supported by the driven end, and the drive gear body includes: The first cut portion is formed into a receiving hole for accommodating at least a portion of the drive end, and at least a portion of the receiving hole extends through in a first direction; The first reserved portion is formed as a mating part for cooperating with the drive end. The mating part has a mating surface and a sub-matting part formed on the mating surface. The mating surface is planar and faces the axis of rotation. The driving end includes: The second part to be cut; The second reserved portion is formed as a mating portion that can enter the receiving hole and is used to mate with the mating portion. Along the first direction, the rotation axis passes through the mating portion. The mating portion has a mating surface and a sub-matting portion formed on the mating surface. The mating surface is planar and faces away from the rotation axis. During the transmission of driving force, the mating surface is used to cooperate with the mating surface, and a keyway fit is formed between the sub-matting part and the sub-mating part.

2. The developing roller according to claim 1, characterized in that, Along the radial direction of the drive gear body, the sub-mate is formed by protruding or recessing from the mate surface, and along the radial direction of the drive end, the sub-mate is formed by recessing or protruding from the mate surface.

3. The developing roller according to claim 1, characterized in that, Viewed along the first direction, the mating surface is formed as a straight line, and the surface of the first cut portion facing the axis of rotation is formed as a curve.

4. The developing roller according to claim 1, characterized in that, Viewed along the first direction, the mating surface is formed as a straight line, and the surface of the second retained portion facing the axis of rotation is formed as a curve.

5. The developing roller according to claim 1, characterized in that, In the drive end, along the radial direction of the developing roller shaft / drive end, the size of the second cut portion is greater than one-sixth of the size of the drive end.

6. The developing roller according to claim 5, characterized in that, In the drive end, along the radial direction of the developing roller shaft / drive end, the size of the second cut portion is less than one-third of the size of the drive end.

7. The developing roller according to claim 1, characterized in that, Along the first direction, the end of the drive end away from the longitudinal center of the developing roller is rounded.

8. The developing roller according to claim 1, characterized in that, The developing roller is also provided with at least one stop for preventing the developing roller from moving in a first direction, wherein the stop is located at at least one of the two ends of the developing roller layer in the first direction.

9. A developing cartridge, characterized in that, It includes a developing housing and a developing roller as described in any one of claims 1 to 8, the developing roller being rotatably disposed in the developing housing and used to supply toner carried by the developing housing to the outside of the developing cartridge.

10. A processing cartridge, comprising a drum cartridge and a developing cartridge as described in claim 9, wherein the drum cartridge and the developing cartridge are coupled together, characterized in that, The drum cartridge includes a drum housing and a photosensitive drum rotatably disposed within the drum housing. A developing roller is arranged opposite to the photosensitive drum. The surface of the photosensitive drum is used to form an electrostatic latent image. The developing roller in the developing cartridge is used to supply toner to the photosensitive drum, thereby developing the electrostatic latent image.

Images