Cleaning assembly, drum unit and powder box

Abstract

The utility model provides a cleaning assembly, a drum unit and a powder box. The cleaning assembly is used for being installed in the drum unit. The drum unit comprises a photosensitive drum, a charging area and a transfer printing area are arranged on the peripheral wall of the photosensitive drum, and in the rotating direction of the photosensitive drum, the cleaning assembly is located on the downstream side of the transfer printing area and located on the upstream side of the charging area; the cleaning assembly comprises a first friction piece, a second friction piece and a driving piece; the first friction piece is cylindrical, and the axis of the first friction piece is parallel to the axis of the photosensitive drum; the driving piece drives the first friction piece to rotate relative to the second friction piece, the second friction piece is in contact with the peripheral wall of the first friction piece, and the first friction piece and the second friction piece can be electrified by friction; the first friction piece is arranged close to the peripheral wall of the photosensitive drum, or the second friction piece is arranged close to the peripheral wall of the photosensitive drum. The cleaning assembly can prevent the photosensitive drum from being damaged, and meanwhile the printing quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of electronic imaging equipment, in particular to a cleaning component, a drum unit and a powder box. Background Art

[0002] As an image recording method for an image forming apparatus such as a printer or a copier, an electrophotographic system is known. The electrophotographic system is a method in which an electrophotographic process is used to form an electrostatic latent image on a photosensitive drum using a laser beam and the electrostatic latent image is developed with a toner to form a toner image. Then, the toner image is transferred onto a recording material and fixed to form an image on the recording material.

[0003] In recent years, in order to reduce the gears of the image forming apparatus, a cleaner-less method has been proposed. The cleaner-less method is a method in which the toner (untransferred toner) remaining on the surface of the photosensitive drum after the transfer step is removed from the photosensitive drum by using a developing member to be collected and reused. In the cleaner-less method, there is no cleaning unit arranged to contact the photosensitive drum, and thus paper dust attached to the photosensitive drum during the transfer step with respect to the recording material may cause poor images.

[0004] There is a powder box, in which a brush for collecting paper dust attached to a photosensitive drum in a transfer step is arranged downstream of a transfer part and upstream of a charging part in the rotation direction of the photosensitive drum. In the structure where the brush contacts the photosensitive drum, fine paper dust will accumulate on the brush to form a mass when the sheet passes through it. When the paper dust passes through the brush, the surface of the photosensitive drum is inhibited from being charged in the charging step of the photosensitive drum, which may cause image defects and the appearance of dot-shaped black spots. When the brush gap is too small, the toner and fine paper dust cannot be collected, resulting in uneven toner amount, and uneven image density and poor charging of the paper dust attachment part may cause image defects. If the brush gap is too large, the toner passability will be low, and the toner will be stuck and cause flying and contaminating the equipment. Different products use different toner diameters, so it is necessary to accurately control the gap size of the brush, resulting in more tests for matching the cleaning device, which increases the cost and complexity of the cleaning device. In addition, the brush is easy to damage the photosensitive drum during the friction process of direct contact with the photosensitive drum, thereby affecting the image development and printing effect. Utility Model Content

[0005] The first purpose of the utility model is to provide a cleaning component which can avoid damaging a photosensitive drum and ensure printing quality.

[0006] The second object of the utility model is to provide a drum unit having the cleaning assembly.

[0007] The third object of the utility model is to provide a powder box having the above-mentioned drum unit.

[0008] To achieve the above-mentioned first purpose, the utility model provides a cleaning component, which is used to be installed in a drum unit; the drum unit includes a photosensitive drum, and a charging area and a transfer area are arranged on the peripheral wall of the photosensitive drum. In the rotation direction of the photosensitive drum, the cleaning component is located on the downstream side of the transfer area and on the upstream side of the charging area; the cleaning component includes a first friction member, a second friction member and a driving member; the first friction member is cylindrical, and the axis of the first friction member is parallel to the axis of the photosensitive drum; the driving member drives the first friction member to rotate relative to the second friction member, and the second friction member contacts the outer peripheral wall of the first friction member, and the first friction member and the second friction member can be frictionally charged; the first friction member is arranged close to the outer peripheral wall of the photosensitive drum, or the second friction member is arranged close to the outer peripheral wall of the photosensitive drum.

[0009] It can be seen from the above scheme that during the operation of the photosensitive drum, the driving member drives the first friction member to rotate. Since the second friction member contacts the outer peripheral wall of the first friction member, the friction between the first friction member and the second friction member generates static electricity. When the paper scraps and residual carbon powder remaining on the surface of the photosensitive drum after the photosensitive drum completes the transfer work and rotates with the photosensitive drum to the cleaning device, the static electricity carried by the first friction member or the second friction member adsorbs the paper scraps and residual carbon powder to the surface of the first friction member or the second friction member to achieve the purpose of cleaning the photosensitive drum, thereby ensuring that the surface of the photosensitive drum can be normally charged and exposed, and ensuring the printing quality. At the same time, it can avoid the brush used as a cleaning member in the prior art directly contacting the photosensitive drum, causing damage to the photosensitive drum during the friction process.

[0010] A preferred solution is that the second friction member is made of a flexible material, extends along the axial direction of the photosensitive drum, is rectangular in its unfolded state, has two sides of the second friction member parallel to the photosensitive drum connected to the top wall of the frame, and the first friction member is covered on the inner side of the second friction member.

[0011] It can be seen that the above connection method, on the one hand, facilitates a larger contact area between the two friction parts, thereby facilitating the generation of static electricity. On the other hand, the first friction part is enclosed in the second friction part, which can ensure the stability of the connection of the first friction part and at the same time ensure the distance between the first friction part and the photosensitive drum.

[0012] A further solution is that the distance between two edges of the second friction member connected to the frame is less than or equal to the outer diameter of the first friction member.

[0013] It can be seen that this can increase the contact area between the two friction parts and facilitate the generation of static electricity.

[0014] A preferred solution is that the second friction member is cylindrical and is arranged parallel to the first friction member.

[0015] It can be seen that the second friction member can be in the shape of a roller. When the first friction member rotates, due to the contact between the first friction member and the peripheral wall of the second friction member, friction is generated between the two, thereby driving the second friction member to rotate, generating static electricity to absorb paper scraps or residual carbon powder on the surface of the photosensitive drum to achieve the effect of cleaning the photosensitive drum.

[0016] A further solution is that the cleaning assembly also includes a cleaning roller, which is arranged parallel to the first friction member; the cleaning roller includes a roller body and a porous material layer, the porous material layer covers the roller body, and the cleaning roller contacts the first friction member.

[0017] It can be seen that after the paper scraps and residual carbon powder on the photosensitive drum are adsorbed onto the first friction part or the second friction part through the static electricity generated by the friction between the first friction part and the second friction part, these paper scraps and residual carbon powder will be adsorbed into the porous material layer through the setting of the cleaning roller, thereby avoiding the static electricity generation effect being affected when there are too many debris on the friction parts.

[0018] A preferred solution is that the first friction member has a first friction portion, and the second friction member has a second friction portion; the material of one of the first friction portion and the second friction portion is silk, and the material of the other is glass; or the material of one of the first friction portion and the second friction portion is fur, and the material of the other is rubber; when the waste powder on the photosensitive drum is positively charged, the friction portion made of silk or rubber is arranged close to the photosensitive drum; when the waste powder on the photosensitive drum is negatively charged, the friction portion made of fur or glass is arranged close to the photosensitive drum.

[0019] A preferred solution is that the distance between the friction member close to the photosensitive drum and the photosensitive drum is in the range of 0.1 mm to 1 mm.

[0020] A preferred solution is that the driving member includes a driving gear, which is arranged at an axial end of the first friction member and coaxially with the first friction member, and the driving gear is meshed with a gear at the end of the photosensitive drum.

[0021] To achieve the second objective, the utility model provides a drum unit, including a photosensitive drum and the cleaning assembly.

[0022] To achieve the third objective, the utility model provides a powder box including a drum unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the first embodiment of the powder box of the utility model.

[0024] Figure 2 It is a structural exploded view of the first embodiment of the powder box of the utility model.

[0025] Figure 3It is a cross-sectional view of the photosensitive drum, charging roller, cleaning assembly, developing roller and powder feeding roller in the first embodiment of the powder box of the utility model.

[0026] Figure 4 It is a stereoscopic diagram of the photosensitive drum, charging roller and cleaning assembly in the first embodiment of the powder box of the utility model.

[0027] Figure 5 It is a left view of the photosensitive drum, charging roller and cleaning assembly in the first embodiment of the powder box of the utility model.

[0028] Figure 6 It is a structural diagram of the powder replenishing bin in the frame of the first embodiment of the powder box of the utility model.

[0029] Figure 7 It is a stereoscopic diagram of the photosensitive drum, charging roller and cleaning assembly in the second embodiment of the powder box of the utility model.

[0030] Figure 8 It is a structural diagram of the powder replenishing bin in the frame in the second embodiment of the powder box of the utility model.

[0031] Fig. 9 It is a left view of the photosensitive drum, charging roller and cleaning assembly in the second embodiment of the powder box of the utility model.

[0032] Fig.10 yes Fig. 9 A partial enlarged view of point A in the middle.

[0033] Fig.11 It is a structural exploded view of the third embodiment of the powder box of the utility model.

[0034] Fig.12 It is a stereoscopic diagram of the photosensitive drum, charging roller and cleaning assembly in the third embodiment of the powder box of the utility model.

[0035] Fig.13 It is a right side view of the photosensitive drum, charging roller and cleaning assembly in the third embodiment of the powder box of the utility model.

[0036] Fig.14 yes Fig.13 A partial enlarged view of point B in the middle.

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0038] Cleaning assembly, drum unit and powder box first embodiment:

[0039] See also Figures 1 to 5 The powder box includes a developing unit 1 and a drum unit 2.

[0040] The developing unit 1 includes a frame 10 , a powder feeding roller 11 and a developing roller 12 . Both the powder feeding roller 11 and the developing roller 12 are rotatably supported on the frame 10 .

[0041] The drum unit 2 includes a photosensitive drum 21, a charging roller 22 and a cleaning assembly 23. The photosensitive drum 21 is rotatably supported on the frame 10. A charging area 211 and a transfer area 212 are arranged on the peripheral wall of the photosensitive drum 21. The charging area 211 is opposite to the charging roller 22, and the transfer area 212 is opposite to the transfer roller 6 of the imaging device. Figure 5 In the direction indicated by arrow R), the cleaning assembly 23 is located at the downstream side of the transfer area 212 and at the upstream side of the charging area 211.

[0042] The cleaning assembly 23 includes a first friction member 3, a second friction member 4 and a driving member 5. The first friction member 3 is cylindrical, the axis of the first friction member 3 is parallel to the axis of the photosensitive drum 21, the driving member 5 includes a driving gear 51, the driving gear 51 is arranged at the axial end of the first friction member 3 and is coaxially arranged with the first friction member 3, the driving gear 51 is meshed with the gear 213 at the end of the photosensitive drum 21, the driving gear 51 drives the first friction member 3 to rotate, the second friction member 4 is in contact with the outer peripheral wall of the first friction member 3, the first friction member 3 rotates relative to the second friction member 4, and the first friction member 3 and the second friction member 4 can be electrified by friction. The second friction member 4 is arranged close to the outer peripheral wall of the photosensitive drum 21.

[0043] The first friction member 3 has a first friction portion 31, and the second friction member 4 has a second friction portion 41. The material of the first friction portion 31 is glass, and the material of the second friction portion 41 is silk. Preferably, the first friction member 3 is a glass rod, and the second friction member 4 is rectangular in its unfolded state. The first friction portion 31 is located on the outer peripheral wall of the glass rod, and the second friction portion 41 is the portion covering the glass rod. The second friction portion 41 is arranged closer to the outer peripheral wall of the photosensitive drum 21 than the first friction portion 31.

[0044] In this embodiment, the waste toner on the photosensitive drum 21 is positively charged, and the second friction portion 41 is disposed close to the outer peripheral wall of the photosensitive drum 21. Figure 5 As shown, the distance d between the second friction portion 41 and the photosensitive drum 21 is in the range of 0.1 mm to 1 mm.

[0045] The second friction member 4 extends along the axial direction of the photosensitive drum 21, and the first edge 42 and the second edge 43 of the second friction member 4 parallel to the photosensitive drum 21 are both connected to the top wall of the frame 10, and the first friction member 3 is covered on the inner side of the second friction member 4. This connection mode, on the one hand, facilitates a larger contact area between the first friction member 3 and the second friction member 4, thereby facilitating the generation of static electricity, and on the other hand, the first friction member 3 is contained in the second friction member 4, which can ensure the stability of the connection of the first friction member 3 and the distance between the first friction member 3 and the photosensitive drum 21. Preferably, the distance between the two edges of the second friction member 4 connected to the frame 10 is less than or equal to the outer diameter of the first friction member 3, so that the contact area between the first friction member 3 and the second friction member 4 can be increased, facilitating the generation of static electricity.

[0046] As can be seen from the above, during the operation of the photosensitive drum, the driving member drives the first friction member to rotate. Since the second friction member contacts the outer peripheral wall of the first friction member, the friction between the first friction member and the second friction member generates static electricity. When the paper scraps and residual carbon powder remaining on the surface of the photosensitive drum after the photosensitive drum completes the transfer work and rotates with the photosensitive drum to the cleaning device, the static electricity carried by the first friction member or the second friction member adsorbs the paper scraps and residual carbon powder to the surface of the first friction member or the second friction member to achieve the purpose of cleaning the photosensitive drum, thereby ensuring that the surface of the photosensitive drum can be normally charged and exposed, and ensuring the printing quality. At the same time, it can avoid the brush used as a cleaning member in the prior art directly contacting the photosensitive drum, causing damage to the photosensitive drum during the friction process.

[0047] Cleaning assembly, drum unit and powder box second embodiment:

[0048] As an illustration of a second embodiment of the cleaning assembly, drum unit and powder box of the utility model, only the differences from the first embodiment of the cleaning assembly, drum unit and powder box described above are described below.

[0049] See also Figures 7 to 10 In this embodiment, the second friction member 204 is also cylindrical and is arranged parallel to the first friction member 203 and the photosensitive drum 221. The first friction member 203 is a glass rod, and the second friction member 204 includes a friction roller body 241 and a silk layer 242 wrapped outside the friction roller body 241. The silk layer 242 of the second friction member 204 contacts the outer peripheral wall of the first friction member 203. Both ends of the friction roller body 241 and both ends of the first friction member 203 can be rotatably supported on the frame 210, and no gear is set at the end of the friction roller body 241. The first friction part 231 is located on the outer peripheral wall of the glass rod, and the second friction part 240 is located on the silk layer 242. In other embodiments, the second friction member 204 can also be a rubber rod, and accordingly, the friction part of the first friction member 203 is the fur layer wrapped outside the friction roller body of the first friction member 203.

[0050] It can be seen that the second friction member can be in the shape of a roller. When the first friction member rotates, due to the contact between the first friction member and the peripheral wall of the second friction member, friction is generated between the two, thereby driving the second friction member to rotate, generating static electricity to absorb paper scraps or residual carbon powder on the surface of the photosensitive drum to achieve the effect of cleaning the photosensitive drum.

[0051] The third embodiment of the cleaning assembly, the drum unit and the powder box:

[0052] As an illustration of a third embodiment of the cleaning assembly, drum unit and powder box of the present invention, only the differences from the first embodiment of the cleaning assembly, drum unit and powder box described above are described below.

[0053] See also Figures 11 to 14 In this embodiment, the second friction member 304 is also cylindrical and is arranged parallel to the first friction member 303. The material of the first friction part 331 is rubber, and the material of the second friction part 340 is fur. Preferably, the first friction member 303 is a rubber rod, and the second friction member 304 includes a friction roller body 341 and a fur layer 342 covering the friction roller body 341. The first friction part 331 is located on the outer peripheral wall of the rubber rod, and the second friction part 340 is located on the fur layer 342. The first friction member 303 is arranged closer to the outer peripheral wall of the photosensitive drum 321 than the second friction member 304.

[0054] The fur layer 342 of the second friction member 304 contacts the outer peripheral wall of the first friction member 303 , both ends of the friction roller body 341 and both ends of the first friction member 303 are rotatably supported on the frame 310 , and no gears are provided at the ends of the friction roller body 341 .

[0055] In this embodiment, the cleaning assembly 330 further includes a cleaning roller 37, which is arranged parallel to the first friction member 303. The cleaning roller 37 includes a roller body and a porous material layer, preferably, the porous material layer is a porous honeycomb sponge layer. The porous material layer covers the roller body, the cleaning roller 37 is in contact with the first friction member 303, and a cleaning gear 373 is arranged at the end of the cleaning roller 37, and the cleaning gear 373 is meshed with a driving gear 351 arranged at the end of the first friction member 303 to transmit a rotational driving force to the cleaning roller 37, thereby driving the cleaning roller 37 to rotate.

[0056] It can be seen that after the paper scraps and residual carbon powder on the photosensitive drum are adsorbed onto the first friction part or the second friction part through the static electricity generated by the friction between the first friction part and the second friction part, these paper scraps and residual carbon powder will be adsorbed into the porous material layer through the setting of the cleaning roller, thereby avoiding the static electricity generation effect being affected when there are too many debris on the friction parts.

[0057] In addition, when the waste powder on the photosensitive drum is positively charged, if the friction part of the first friction member is made of silk or rubber, the first friction member is arranged closer to the outer peripheral wall of the photosensitive drum relative to the second friction member. When the waste powder on the photosensitive drum is negatively charged, the friction part made of fur or glass is arranged closer to the photosensitive drum. The distance between the two edges connected to the drum frame on the second friction member can also be greater than the outer diameter of the first friction member, which will reduce the contact area between the second friction member and the first friction member. The material, thickness, length, etc. of the porous material layer of the cleaning roller can be changed as needed. The material of the first friction part and the second friction part can also be changed as needed, as long as the friction between the two can generate static electricity, and according to the electrical properties of the waste powder on the photosensitive drum, the friction part with the charge opposite to the electrical properties can be selected to be close to the photosensitive drum. The powder box can be an integrated box or a split box, and the split box is a developing unit and a drum unit connected in a detachable manner. The above changes can also achieve the purpose of the utility model.

[0058] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cleaning assembly, the cleaning assembly being installed in the drum unit; The drum unit comprises a photosensitive drum, a charging area and a transfer area are arranged on the peripheral wall of the photosensitive drum, and in the rotation direction of the photosensitive drum, the cleaning assembly is located at the downstream side of the transfer area and at the upstream side of the charging area; Features ； The cleaning assembly comprises a first friction member, a second friction member and a driving member; The first friction member is cylindrical, and the axis of the first friction member is parallel to the axis of the photosensitive drum; The driving member drives the first friction member to rotate relative to the second friction member, the second friction member contacts the outer peripheral wall of the first friction member, and the first friction member and the second friction member can be frictionally electrified; The first friction member is disposed close to the peripheral wall of the photosensitive drum, or the second friction member is disposed close to the peripheral wall of the photosensitive drum.

2. The cleaning assembly according to claim 1, characterized in that: The second friction member is made of a flexible material and extends along the axial direction of the photosensitive drum. The second friction member is rectangular in its unfolded state. The two sides of the second friction member parallel to the photosensitive drum are connected to the top wall of the frame, and the first friction member is covered on the inner side of the second friction member.

3. The cleaning assembly according to claim 2, characterized in that: A distance between two edges of the second friction member connected to the frame is less than or equal to an outer diameter of the first friction member.

4. The cleaning assembly according to claim 1, characterized in that: The second friction member is cylindrical and is arranged parallel to the first friction member.

5. The cleaning assembly according to claim 4, characterized in that: The cleaning assembly further comprises a cleaning roller, and the cleaning roller is arranged parallel to the first friction member; The cleaning roller includes a roller body and a porous material layer, wherein the porous material layer covers the roller body, and the cleaning roller contacts the first friction member.

6. The cleaning assembly according to any one of claims 1 to 5, characterized in that: The first friction member has a first friction portion, and the second friction member has a second friction portion; One of the first friction part and the second friction part is made of silk and the other is made of glass; or One of the first friction part and the second friction part is made of fur, and the other is made of rubber; When the waste toner on the photosensitive drum is positively charged, a friction portion made of silk or rubber is arranged close to the photosensitive drum; When the waste toner on the photosensitive drum is negatively charged, the friction portion made of fur or glass is disposed close to the photosensitive drum.

7. The cleaning assembly according to any one of claims 1 to 5, characterized in that: The distance between the friction member close to the photosensitive drum and the photosensitive drum is in the range of 0.1 mm to 1 mm.

8. The cleaning assembly according to any one of claims 1 to 5, characterized in that: The driving member includes a driving gear, which is arranged at an axial end of the first friction member and coaxially with the first friction member, and the driving gear is meshed with a gear at an end of the photosensitive drum.

9. A drum unit, characterized in that The invention comprises a photosensitive drum and a cleaning assembly as claimed in any one of claims 1 to 8.

10. A powder box, characterized in that: Comprising the drum unit as claimed in claim 9.

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