Photosensitive unit and process cartridge

Abstract

In the photosensitive unit and the processing box with the photosensitive unit provided by the utility model, the photosensitive unit comprises a photosensitive shell, a charging roller and a photosensitive drum rotatably arranged in the photosensitive shell, the photosensitive drum rotates around a first rotation axis, and the charging roller rotates around a rotation axis parallel to the first rotation axis; the charging roller comprises a charging roller shaft and a charging layer, the charging roller shaft is used for supporting the charging layer, the charging roller shaft is further used for receiving electric power from the outside of the photosensitive unit, and the charging layer is used for making contact with the surface of the photosensitive drum and charging the surface of the photosensitive drum; the photosensitive unit further comprises at least one separation part which is rotatably arranged, the separation part is used for separating the charging layer from the surface of the photosensitive drum before the photosensitive drum is driven to rotate, and when the photosensitive drum is driven to rotate, the separation part is driven to rotate by utilizing the friction force between the photosensitive drum and the separation part, so that the charging layer is in contact with the surface of the photosensitive drum; therefore, before the processing box is used, a user does not need to operate the separating piece, and the operation steps of the user are simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic photographic imaging, in particular to a photosensitive unit detachably installed in an electronic photographic imaging device and a processing box with the photosensitive unit. Background Art

[0002] A processing cartridge is a consumable material that can be detachably installed in an electronic photographic imaging device (hereinafter referred to as "imaging device"). The processing cartridge includes a developing unit and a photosensitive unit. The developing unit includes a developing housing and a developing roller rotatably arranged in the developing housing. The developing housing is used to accommodate the developer, and the developing roller is used to carry the developer and supply the developer to the photosensitive unit; the photosensitive unit includes a photosensitive housing, a photosensitive drum rotatably arranged in the photosensitive housing, and a charging roller for charging the photosensitive drum. The surface of the photosensitive drum is used to form an electrostatic latent image. The developing roller is used to transport the developer to the photosensitive drum so that the electrostatic latent image is developed.

[0003] After the processing cartridge / photosensitive unit is assembled, the surface of the charging roller will always maintain contact with the surface of the photosensitive drum. Therefore, before the processing cartridge is used, the charging roller and the photosensitive drum that maintain contact for a long time may be deformed, affecting their subsequent use.

[0004] In order to solve the above technical problems, a separator is provided in the existing processing box. After the processing box is assembled, the separator needs to be inserted into the processing box to separate the charging roller and the photosensitive drum from each other. Before using the processing box, the separator is taken out. The separator provided in this way is cumbersome to operate, and the separator is easy to cause damage to the surface of the photosensitive drum and the surface of the charging roller. Utility Model Content

[0005] The photosensitive unit and the processing box having the photosensitive unit provided by the present invention can solve at least one of the above technical problems:

[0006] The photosensitive unit includes a photosensitive housing, a charging roller and a photosensitive drum rotatably arranged in the photosensitive housing, the photosensitive drum rotates around a first rotation axis, and the charging roller rotates around a rotation axis parallel to the first rotation axis; the charging roller includes a charging roller shaft and a charging layer, the charging roller shaft is used to support the charging layer, and the charging roller shaft is also used to receive electricity from outside the photosensitive unit, and the charging layer is used to contact the surface of the photosensitive drum and charge the surface of the photosensitive drum.

[0007] The photosensitive unit also includes at least one rotatable separating member. Before the photosensitive drum is driven to rotate, the separating member is used to separate the charging layer from the surface of the photosensitive drum. When the photosensitive drum is driven to rotate, the friction between the photosensitive drum and the separating member is used to drive the separating member to rotate, so that the charging layer contacts the surface of the photosensitive drum.

[0008] The separating member includes a main body and a first acting portion provided on the main body. The first acting portion is used for contacting the photosensitive drum and is provided as a cantilever.

[0009] The first acting portion includes a fixed portion and a movable portion that are connected to each other, the fixed portion is used to support the movable portion, and the movable portion is used to abut against the surface of the photosensitive drum.

[0010] The movable part includes a protrusion and a recessed part connected to each other, the protrusion protrudes from the recessed part in a direction away from the fixed part, and the surface of the protrusion is formed into an arc surface; the recessed part is used to accommodate the outer surface of the photosensitive drum, and the recessed part is formed into an arc shape. In the radial direction of the main body, the recessed part is closer to the main body than the protrusion.

[0011] When the separating member contacts the surface of the photosensitive drum, the recessed portion is completely in contact with the surface of the photosensitive drum.

[0012] The movable part further has a contact surface, which is located at the connection between the fixed part and the movable part, and the contact surface is also configured as an arc surface.

[0013] The separator also includes a second action portion arranged on the main body, and at least one supporting member is also arranged on the photosensitive unit. The supporting member is used to support the second action portion. Under the action of external force, the second action portion is used to drive the entire separator to rotate.

[0014] The second acting portion has a contact portion, and the supporting member has a matching portion abutting against the contact portion, wherein the contact portion is arranged in an arc shape.

[0015] The contact portion and the matching portion are interference fit.

[0016] A processing box is detachably mounted to an imaging device, and includes a developing unit and a photosensitive unit that are combined with each other; the developing unit includes a developing box housing for accommodating a developer and a developing roller rotatably arranged in the developing box housing, and the developing roller is used to supply the developer to the photosensitive drum so that the electrostatic latent image formed on the surface of the photosensitive drum is developed.

[0017] The separator provided by the utility model can be rotatably arranged in the photosensitive unit. Before using the processing box, the user does not need to operate the separator. After the processing box is installed in the imaging device, the photosensitive drum rotates, and the friction generated between the photosensitive drum and the separator will cause the separator to rotate together, thereby making the surface of the photosensitive drum contact with the charging layer again. Such an arrangement can simplify the user's operating steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the processing box involved in the utility model.

[0019] Figure 2 It is a three-dimensional diagram of the developing unit involved in the present invention.

[0020] Figure 3 This is an exploded view of some components of the photosensitive unit involved in the present invention.

[0021] Figure 4 It is a three-dimensional diagram of a separation component in a photosensitive unit involved in the present invention.

[0022] Figure 5 It is a three-dimensional diagram of the charging roller and the photosensitive drum in the photosensitive unit of the present invention when they are in contact with each other.

[0023] Figure 6 It is a three-dimensional diagram of the photosensitive unit of the present invention when the charging roller and the photosensitive drum are out of contact. DETAILED DESCRIPTION

[0024] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0025] The process cartridge 100 can be detachably mounted to an image forming apparatus, such as Figure 1 、 Figure 2 and Figure 3 As shown, the processing box 100 includes a photosensitive unit 10 and a developing unit 20 that are combined with each other; the photosensitive unit 10 includes a photosensitive housing 11, a photosensitive drum 12 rotatably arranged in the photosensitive housing 11, and the photosensitive drum 12 rotates around a first rotation axis L1 along a rotation direction R; the developing unit 20 includes a developing box housing 21 for accommodating developer and a developing roller 22 rotatably arranged in the developing box housing 21, and the developing roller 22 rotates around a second rotation axis L2, and the second rotation axis L2 is parallel to the first rotation axis L1; the surface of the photosensitive drum 12 is used to form an electrostatic latent image, and the developing roller 22 is used to supply developer to the photosensitive drum 12 to develop the electrostatic latent image on the surface of the photosensitive drum 12; the processing box 100 also includes a handle 13 for facilitating the taking and placing of the processing box 100, and the handle 13 can be provided on the photosensitive unit 10 or the developing unit 20.

[0026] like Figure 3 As shown, the photosensitive unit 10 also includes a charging roller 16 and at least one pushing member 17. The charging roller 16 is used to charge the photosensitive drum 12. The pushing member 17 is used to force the charging roller 16 to contact the photosensitive drum 12. The charging roller 16 rotates around a rotation axis parallel to the first rotation axis L1. The charging roller 16 includes a charging roller shaft 161 and a charging layer 162. The charging roller shaft 161 is used to receive electricity from the imaging device. The charging layer 162 is used to contact the surface of the photosensitive drum 12 and charge the surface of the photosensitive drum 12 so that the surface of the photosensitive drum 12 is charged.

[0027] In some embodiments, the pushing member 17 is configured as an elastic member.

[0028] The photosensitive unit 10 further includes a cleaning blade 15 for cleaning waste developer remaining on the photosensitive drum 12 .

[0029] like Figure 3 and Figure 4 As shown, the processing box 100 also includes at least one separating member 80 for separating the charging layer 162 from the photosensitive drum 12. The separating member 80 is rotatably arranged in the processing box 100 / photosensitive unit 10. Before the photosensitive drum 12 is driven to rotate around the rotation direction R, the separating member 80 is used to separate the charging layer 162 from the surface of the photosensitive drum 12. When the photosensitive drum 12 is driven to rotate around the rotation direction R, the friction between the photosensitive drum 12 and the separating member 80 is used to drive the separating member 80 to rotate, so that the charging layer 162 contacts the surface of the photosensitive drum 12.

[0030] The separator 80 includes a main body 81 and a first action portion 82 arranged on the main body 81. The first action portion 82 is arranged as a cantilever located on the main body 81. The first action portion 82 is used to contact the photosensitive drum 12. Specifically, the first action portion 82 makes the charging layer 162 contact with the photosensitive drum 12 or separate from each other.

[0031] In some embodiments, the separating member 80 / the first acting portion 82 is rotatably sleeved on the charging roller shaft 161 .

[0032] The first action portion 82 includes a fixed portion 821 and a movable portion 822 connected to each other. The fixed portion 821 is used to support the movable portion 822. The movable portion 822 is used to abut against the surface of the photosensitive drum 12. The movable portion 822 includes a protrusion 823 and a recessed portion 824 connected to each other. The protrusion 823 protrudes from the recessed portion 824 in a direction away from the fixed portion 821, and the surface of the protrusion 823 is formed into an arc surface. In this way, the protrusion 823 can make it easier for the separator 80 to separate. away from the photosensitive drum 12 and the charging roller 16; in the radial direction of the main body 81, compared with the protrusion 823, the recessed portion 824 is closer to the main body 81, and the recessed portion 824 is used to accommodate the outer surface of the photosensitive drum 12, so that the movable portion 822 is more stably maintained between the photosensitive drum 12 and the charging layer 162, and the recessed portion 824 is formed in an arc shape, so as to avoid the protrusion 823 and the recessed portion 824 damaging the surface of the photosensitive drum 12 when the separator 80 abuts against the surface of the photosensitive drum 12.

[0033] In some embodiments, when the separator 80 abuts against the surface of the photosensitive drum 12 , the recessed portion 824 is completely in contact with the surface of the photosensitive drum 12 .

[0034] In some embodiments, the movable portion 822 further has a contact surface 825, which is located at the connection between the fixed portion 821 and the movable portion 822. The contact surface 825 is configured as an arc surface, which can further ensure that the surface of the photosensitive drum 12 is not damaged.

[0035] The separating member 80 also includes a second acting portion 83 arranged on the main body 81, and at least one supporting member 18 is also provided on the photosensitive unit 10. The supporting member 18 is used to support the separating member 80 / the second acting portion 83. Under the action of external force, the second acting portion 83 drives the separating member 80 to rotate as a whole, thereby causing the first acting portion 82 to abut against the surface of the photosensitive drum 12, and the surface of the photosensitive drum 12 and the charging layer 162 are separated from each other; the second acting portion 83 has a contact portion 831, and the supporting member 18 has a mating portion 181 that abuts / engages with the contact portion 831. Through the mutual abutment / engagement between the contact portion 831 and the mating portion 181, the separating member 80 / the second acting portion 83 can be stably supported in the photosensitive housing 11.

[0036] In some embodiments, the contact portion 831 is configured to be arc-shaped, which facilitates the interaction between the contact portion 831 and the mating portion 181 .

[0037] In some embodiments, the contact portion 831 and the mating portion 181 are interference fit.

[0038] In some embodiments, the interaction between the second acting portion 83 and the support member 18 can also be used to position the separator 80, so that an external force acts on the second acting portion 83 to rotate the separator 80.

[0039] In some embodiments, the support member 18 can also be used to position the cleaning blade 15 in the photosensitive housing 11 to prevent the position of the cleaning blade 15 from changing.

[0040] The specific operation of separating the photosensitive drum 12 and the charging roller 16 is as follows: Figure 5 As shown, after the process cartridge 100 / photosensitive unit 10 is assembled, under the action of the pushing member 17, the surface of the photosensitive drum 12 is kept in contact with the charging layer 162, and the second action portion 83 is in contact with / engaged with the support member 18. When an external force is applied to the second action portion 83 / separating member 80, the separating member 80 rotates, thereby causing the first action portion 82 to contact the surface of the photosensitive drum 12, as shown in FIG. Figure 6 As shown, the surface of the photosensitive drum 12 and the charging layer 162 are separated from each other.

[0041] After the processing box 100 is installed in the imaging device, the photosensitive drum 12 receives the driving force from the imaging device, and the photosensitive drum 12 rotates around the first rotation axis L1 along the rotation direction R. As the photosensitive drum 12 rotates, the friction generated between the photosensitive drum 12 and the separator 80 will cause the separator 80 to rotate together until the first action portion 82 / separator 80 is completely out of contact with the surface of the photosensitive drum 12. At this time, the surface of the photosensitive drum 12 contacts the charging layer 162 again.

[0042] [Beneficial Effects]

[0043] Compared with the prior art, the photosensitive unit provided by the present invention and the process cartridge 100 having the photosensitive unit have the following beneficial effects:

[0044] First, the separator 80 provided by the present invention can be rotatably arranged in the photosensitive unit 10. Before using the processing box 100, the user does not need to operate the separator 80. After the processing box 100 is installed in the imaging device, the photosensitive drum 12 rotates, and the friction generated between the photosensitive drum 12 and the separator 80 will cause the separator 80 to rotate together, thereby causing the surface of the photosensitive drum 12 to contact the charging layer 162 again. Such a setting can simplify the user's operating steps.

[0045] Secondly, the separator 80 includes a movable portion 822 for abutting against the surface of the photosensitive drum 12, the movable portion 822 includes a protrusion 823 and a recessed portion 824, the protrusion 823 protrudes from the recessed portion 824 in a direction away from the fixed portion 821, and the surface of the protrusion 823 is formed as an arc surface; the recessed portion 824 is used to accommodate the outer surface of the photosensitive drum 12, and the recessed portion 824 is arc-shaped. Through such an arrangement, before the processing box 100 is not used, the charging roller 16 / charging layer 162 and the surface of the photosensitive drum 12 can always be kept separated from each other, and the separator 80 will not damage the surface of the photosensitive drum 12 and the surface of the charging roller 16.

Claims

1. A photosensitive unit comprising a photosensitive housing, a charging roller, and a photosensitive drum rotatably disposed in the photosensitive housing, wherein the photosensitive drum rotates about a first rotation axis, and the charging roller rotates about a rotation axis parallel to the first rotation axis; the charging roller comprises a charging roller shaft and a charging layer, the charging roller shaft being configured to support the charging layer and also configured to receive power from outside the photosensitive unit, and the charging layer being configured to contact a surface of the photosensitive drum and charge the surface of the photosensitive drum; It is characterized by: The photosensitive unit also includes at least one rotatable separating member. Before the photosensitive drum is driven to rotate, the separating member is used to separate the charging layer from the surface of the photosensitive drum. When the photosensitive drum is driven to rotate, the friction between the photosensitive drum and the separating member is used to drive the separating member to rotate, so that the charging layer contacts the surface of the photosensitive drum.

2. The photosensitive unit according to claim 1, wherein: The separating member includes a main body and a first acting portion provided on the main body. The first acting portion is used for contacting the photosensitive drum and is provided as a cantilever.

3. The photosensitive unit according to claim 2, wherein: The first acting portion includes a fixed portion and a movable portion that are connected to each other, the fixed portion is used to support the movable portion, and the movable portion is used to abut against the surface of the photosensitive drum.

4. The photosensitive unit according to claim 3, wherein: The movable part includes a protrusion and a recessed part connected to each other, the protrusion protrudes from the recessed part in a direction away from the fixed part, and the surface of the protrusion is formed into an arc surface; the recessed part is used to accommodate the outer surface of the photosensitive drum, and the recessed part is formed into an arc shape. In the radial direction of the main body, the recessed part is closer to the main body than the protrusion.

5. The photosensitive unit according to claim 4, wherein: When the separating member contacts the surface of the photosensitive drum, the recessed portion is completely in contact with the surface of the photosensitive drum.

6. The photosensitive unit according to claim 4, wherein: The movable part further has a contact surface, which is located at the connection between the fixed part and the movable part, and the contact surface is also configured as an arc surface.

7. The photosensitive unit according to any one of claims 2 to 6, characterized in that: The separator also includes a second action portion arranged on the main body, and at least one supporting member is also arranged on the photosensitive unit. The supporting member is used to support the second action portion. Under the action of external force, the second action portion is used to drive the entire separator to rotate.

8. The photosensitive unit according to claim 7, wherein: The second acting portion has a contact portion, and the supporting member has a matching portion abutting against the contact portion, wherein the contact portion is arranged in an arc shape.

9. The photosensitive unit according to claim 8, wherein: The contact portion and the matching portion are interference fit.

10. A process cartridge, detachably mounted to an image forming apparatus, characterized in that: The processing box includes a developing unit and a photosensitive unit according to any one of claims 1 to 9; the developing unit and the photosensitive unit are combined with each other, and the developing unit includes a developing box shell for accommodating a developer and a developing roller rotatably arranged in the developing box shell, and the developing roller is used to supply the developer to the photosensitive drum so that the electrostatic latent image formed on the surface of the photosensitive drum is developed.

Images