CN118011747A - Drum unit and process cartridge - Google Patents
Drum unit and process cartridge Download PDFInfo
- Publication number
- CN118011747A CN118011747A CN202410300277.XA CN202410300277A CN118011747A CN 118011747 A CN118011747 A CN 118011747A CN 202410300277 A CN202410300277 A CN 202410300277A CN 118011747 A CN118011747 A CN 118011747A
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- China
- Prior art keywords
- drum
- conductive member
- photosensitive drum
- drum unit
- blade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 49
- 238000004140 cleaning Methods 0.000 claims abstract description 49
- 238000007789 sealing Methods 0.000 claims abstract description 40
- 239000002699 waste material Substances 0.000 claims abstract description 35
- 238000003384 imaging method Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 4
- 230000005684 electric field Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
Landscapes
- Cleaning In Electrography (AREA)
- Electrophotography Configuration And Component (AREA)
Abstract
The present invention provides a drum unit and a process cartridge mounted with the drum unit, the drum unit/process cartridge being for mounting in an image forming apparatus, the drum unit comprising: a drum housing; a photosensitive drum rotatably provided in the drum housing; a cleaning scraper fixedly arranged in the drum shell and contacted with the photosensitive drum for removing waste developer on the surface of the photosensitive drum, wherein a waste developer bin capable of containing the waste developer is formed between the cleaning scraper and the drum shell; a sealing member for sealing between the photosensitive drum and the drum housing to prevent leakage of the waste developer, an opening communicating with the waste developer hopper being formed between the sealing member and the cleaning blade; an electrical contact for receiving power from the imaging device; the drum unit is provided with a conductive member connected to the electrical contact member; the conductive member is positioned on at least one of two sides of the opening along a direction which is not parallel to the rotation axis of the photosensitive drum; the drum unit charges the photosensitive drum by adopting the conductive member, and the charging roller is not arranged on the drum unit, so that the production cost of the drum unit is saved.
Description
Technical Field
The present invention relates to the field of electrophotographic image forming, and more particularly, to a drum unit and a process cartridge detachably mountable to an electrophotographic image forming apparatus.
Background
A process cartridge is a consumable material detachably mounted to an electrophotographic image forming apparatus (hereinafter referred to as "image forming apparatus"), and generally, the process cartridge includes a process cartridge housing for accommodating a developer, a rotary rotatably provided in the process cartridge housing, the rotary including at least a developing roller, a photosensitive drum, and a charging roller; the developing roller is used for supplying developer to the photosensitive drum, and the charging roller is used for charging the photosensitive drum; the process cartridge includes at least one electrical contact for making electrical connection of the rotating member with the image forming apparatus.
Generally, the charging roller consists of a metal roller shaft, a sponge positioned at the radial outer side of the roller shaft and a leather sheath, the current charging roller has high cost, and impurities are easily adsorbed on the surface of the charging roller, so that the surface of the photosensitive drum is also easy to have impurities, and the imaging quality and the service life of the photosensitive drum are affected; on the one hand, the charging roller needs to be rotatably mounted in a charging roller holder in the process cartridge, and the frictional force between the charging roller and the charging roller holder needs to be as small as possible to reduce the resistance when the charging roller rotates, and on the other hand, it is also required to ensure that the charging roller can stably receive electric power from the image forming apparatus, and a sufficient contact force needs to be maintained between the charging roller and the charging roller holder, which makes the mounting difficulty of the charging roller increased.
Disclosure of Invention
The drum unit and the process cartridge mounted with the drum unit provided by the invention can solve at least one of the above technical problems.
A drum unit for mounting in an image forming apparatus, the drum unit comprising: a drum housing; a photosensitive drum rotatably provided in the drum housing for forming an electrostatic latent image developable by a developer on a surface thereof; a cleaning scraper fixedly arranged in the drum shell and contacted with the photosensitive drum for removing waste developer on the surface of the photosensitive drum, wherein a waste developer bin capable of containing the waste developer is formed between the cleaning scraper and the drum shell; a sealing member for sealing between the photosensitive drum and the drum housing to prevent leakage of the waste developer, an opening communicating with the waste developer hopper being formed between the sealing member and the cleaning blade; an electrical contact for receiving power from the imaging device; the drum unit is provided with a conductive member connected to the electrical contact member; the conductive member is located on at least one of both sides of the opening in a direction non-parallel to the rotational axis of the photosensitive drum.
The conductive member is disposed on at least one of the cleaning blade and the sealing member.
The cleaning scraper comprises a knife rest and a scraping blade arranged on the knife rest, and the conductive piece is arranged on the knife rest or the scraping blade; the cleaning blade is also provided with a mounting portion through which the conductive member and the blade holder are fixed to the drum housing.
The conductive member is provided on the drum housing, and the conductive member is in direct contact with the photosensitive drum, or in contact with at least one of the cleaning blade and the sealing member.
The conductive piece is arranged on the sealing piece and is electrically connected with the sealing piece; the conductive member is integrally formed with the sealing member; the conductive member and the cleaning blade are located upstream and downstream of the opening, respectively, in the rotational direction of the photosensitive drum.
The conductive member is provided as a conductive rubber or a conductive metal member.
And a process cartridge detachably mountable to the image forming apparatus, including a developing unit and a drum unit, the developing unit and the drum unit being connected to each other, the developing unit being configured to accommodate a developer.
The drum unit does not use the charging roller to charge the photosensitive drum, but adopts the conductive member to charge the photosensitive drum, and the charging roller is not arranged in the drum unit, so that the production cost of the drum unit is saved; in addition, the conductive piece in the drum unit is arranged on the cleaning scraper or the sealing piece, or the conductive piece and the cleaning scraper or the sealing piece are integrally arranged, so that the arrangement can ensure that the photosensitive drum is charged, and the installation difficulty of the conductive piece can be reduced.
Drawings
Fig. 1 is a perspective view of a process cartridge according to the present invention.
Fig. 2 is a cross-sectional view of the process cartridge according to the present invention taken along the AA direction in fig. 1.
Fig. 3 is a perspective view of a developing unit of the process cartridge according to the present invention.
Fig. 4 is a cross-sectional view of the drum unit of the process cartridge according to the present invention taken along the AA direction in fig. 1.
Fig. 5 is a perspective view of a drum unit of a process cartridge according to a first embodiment of the present invention.
Fig. 6 is a partial perspective view of a process cartridge according to the first embodiment of the present invention after the photosensitive drum, the cleaning blade, the conductive member, and the electric contact member are combined.
Fig. 7 is a partial perspective view of a cleaning blade, a conductive member, and an electrical contact member of a process cartridge according to the first embodiment of the present invention after being combined.
Fig. 8 is a perspective view of a drum unit of a process cartridge according to a second embodiment of the present invention.
Fig. 9 is a perspective view of a process cartridge according to a second embodiment of the present invention after a photosensitive drum is hidden by a drum unit.
Fig. 10 is a partial perspective view of a process cartridge according to the second embodiment of the present invention after the first side cover, the photosensitive drum, the cleaning blade, the second conductive member, the sealing member, and the electrical contact member are combined.
Fig. 11 is a partial perspective view of a process cartridge according to the second embodiment of the present invention after the photosensitive drum, the cleaning blade, the second conductive member, the sealing member, and the electrical contact member are combined.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a perspective view of a process cartridge according to the present invention; FIG. 2 is a cross-sectional view of the process cartridge according to the present invention taken along the AA in FIG. 1; fig. 3 is a perspective view of a developing unit of the process cartridge according to the present invention; fig. 4 is a cross-sectional view of the drum unit of the process cartridge according to the present invention taken along the AA direction in fig. 1; fig. 5 is a perspective view of a drum unit of a process cartridge according to the first embodiment of the present invention; fig. 6 is a partial perspective view of a process cartridge according to the first embodiment of the present invention after the photosensitive drum, the cleaning blade, the conductive member, and the electric contact member are combined.
As shown in fig. 1 to 6, the process cartridge 100 includes a drum unit 10, a developing unit 20, a first side cover 30, and a second side cover 40, and the drum unit 10 and the developing unit 20 are coupled to each other.
As shown in fig. 3, the developing unit 20 includes a developing housing, which further includes a bottom case 21 and a face cover 23, a developer cartridge 24 for containing developer is formed between the face cover 23 and the bottom case 21, and a developing roller 22 rotatably provided in the developing housing, the developing roller 22 for carrying the developer and supplying the developer to the drum unit 10.
As shown in fig. 4 and 5, the drum unit 10 includes a drum housing 11, a photosensitive drum 12 rotatably provided in the drum housing 11, a cleaning blade 13 for cleaning a residual developer (waste developer) 17 on a surface of the photosensitive drum 12, the photosensitive drum 12 being rotated about a rotational axis M in a rotational direction K, the cleaning blade 13 being fixedly installed in the drum housing 11, a waste developer hopper 14 for containing the waste developer 17 being formed between the cleaning blade 13 and the drum housing 11, the cleaning blade 13 including a blade holder 131 and a blade 132 provided on the blade holder 131, one end of the blade 132 being connected to the blade holder 131, the other end of the blade 132 being in contact with a surface of the photosensitive drum 12 to remove the waste developer 17, the blade holder 131 and the blade 132 being made of the same material or different materials, the blade holder 131 and the blade 132 being formed integrally or separately.
The drum unit 10 is further provided with a seal member 15 for preventing leakage of the waste developer 17, the seal member 15 sealing between the photosensitive drum 11 and the drum housing 11, one end of the seal member 15 being mounted on the drum housing 11, the other end of the seal member 15 being for contact with the photosensitive drum 12, the seal member 15 having an opening 16 between the seal member 15 and the blade 132, the opening 16 communicating with the waste developer tank 14, the waste developer 17 entering the waste developer tank 14 through the opening 16, the seal member 15 being typically provided as a plastic sheet.
As shown in fig. 1 and 6, the drum housing 11 and the developing housing may be collectively referred to as a process cartridge housing in which the photosensitive drum 12 and the developing roller 22 are rotatably provided, and the first side cover 30 and the second side cover 40 are respectively located at both ends of the process cartridge housing, the rotation axis M of the photosensitive drum 12 and the rotation axis of the developing roller 22 being parallel to each other; as shown in fig. 1 and 6, the process cartridge 100 further includes at least one electrical contact 60, the electrical contact 60 being at least for electrically connecting the photosensitive drum 12 with the image forming apparatus, at least a portion of the electrical contact 60 being disposed at one end of the cartridge housing; as shown in fig. 7, the electrical contact 60 includes at least a first end 61 and a second end 62 connected to each other, the first end 61 being optionally used for electrical connection with an image forming apparatus, the second end 62 being electrically connected with a conductive member 83 described below, and the process cartridge 100 being optionally further provided with a handle 70 for taking and placing.
The direction parallel to the rotation axis M of the photosensitive drum 12 is the left-right direction, the gravity direction of the process cartridge 100 is the downward direction, the direction opposite to the downward direction is the upward direction, the up-down direction intersects the left-right direction, the direction intersecting the up-down direction, the left-right direction is the front-back direction, and preferably, the up-down direction, the left-right direction, the front-back direction are mutually perpendicular, based on the posture of the process cartridge 100 in fig. 1; in the front-rear direction, the photosensitive drum 12 and the handle 70 are located at the front end and the rear end of the process cartridge 100, respectively, the drum housing 11 and the developing housing are arranged in the up-down direction, and the drum housing 11 is located above the developing housing.
The process cartridge 100 is detachably mounted in the image forming apparatus, as shown in fig. 4, when the process cartridge 100 is used for image formation, the photosensitive drum rotates about the rotation direction K, the photosensitive drum 12 is charged by at least one of the conductive member 83, the cleaning blade 13, and the sealing member 15 through the electric contact member 60, and in some embodiments, the photosensitive drum 12 is negatively charged, and the developer can also be negatively charged; in some embodiments, the photoreceptor drum 12 may also be positively charged, as may the developer.
Example one
Fig. 7 is a partial perspective view of a cleaning blade, a conductive member, and an electrical contact member of a process cartridge according to the first embodiment of the present invention after being combined.
As shown in fig. 5, 6 and 7, the drum unit 10 is further provided therein with a conductive member 83, one end of the conductive member 83 being electrically connected to the electric contact 60, alternatively, the conductive member 83 being electrically connected to the second end 62 of the electric contact 60, the other end of the conductive member 83 being electrically connected to the wiper 132 or the blade holder 131, or the other end of the conductive member 83 being provided as a part of the wiper 132 or the blade holder 131; when the conductive member 83 is provided on the blade 132, the action of charging the photosensitive drum 12 by the conductive member 83 is thus provided simultaneously with the action of cleaning the waste developer 17 by the blade 132, and at this time, the blade 132 has conductivity, alternatively, the blade holder 131 may not necessarily be made of a conductive material; when the conductive member 83 is electrically connected to the blade holder 131, both the blade 132 and the blade holder 131 have conductivity.
When the conductive member 83 is directly connected to the wiper 132 or the conductive member 83 is provided on the wiper 132, loss during power transmission can be reduced.
The material and shape of the conductive member 83 should not be limited as long as the conductive member 83 can transmit electric power from the electric contact 60 to the cleaning blade 13, or the conductive member 83 can transmit electric power from the electric contact 60 directly to the photosensitive drum 12, and preferably, the conductive member 83 is provided as a conductive metal sheet.
As shown in fig. 5 and 7, the blade 132 is provided as a conductive rubber strip, and when the conductive member 83 is provided on the blade holder 131, the electric power of the image forming apparatus is transmitted to the photosensitive drum 12 through the electric contact member 60, the conductive member 83, the blade holder 131, and the blade 132; alternatively, as shown in fig. 5, the conductive member 83 is located in the middle of the blade holder 131 in the front-rear direction and extends in the left-right direction, in other words, in the left-right direction, the conductive member 83 makes more point/surface contact with the blade holder 131 as much as possible, so that the resistance of the conductive member 83 is set smaller, and the charging of the photosensitive drum 12 can be more sufficient; when the conductive member 83 is provided on the wiper 132, the conductive member 83 may also make as much point/surface contact with the wiper 132 as possible.
As shown in fig. 5 and 7, the cleaning blade 13 further includes a mounting portion 133, and the conductive member 83 and the blade holder 131 can be fixed together to the drum housing 11 by the mounting portion 133, so that the cleaning blade 13 provided can reduce the mounting steps and also ensure stable mounting of the conductive member 83.
Example two
Fig. 8 is a perspective view of a drum unit of a process cartridge according to a second embodiment of the present invention; fig. 9 is a perspective view of a process cartridge according to a second embodiment of the present invention after a photosensitive drum is hidden by a drum unit; fig. 10 is a partial perspective view of a process cartridge according to the second embodiment of the present invention after the first side cover, the photosensitive drum, the cleaning blade, the second conductive member, the sealing member, and the electrical contact member are combined; fig. 11 is a partial perspective view of a process cartridge according to the second embodiment of the present invention after the photosensitive drum, the cleaning blade, the second conductive member, the sealing member, and the electrical contact member are combined.
As shown in fig. 2 and 4, during image formation, the developer is transferred from the surface of the photosensitive drum 12 to the surface of the image forming medium by the electric field force formed between the photosensitive drum 12 and the transfer roller in the image forming apparatus, but a part of the untransferred developer, i.e., the waste developer 17, remains on the surface of the photosensitive drum 12.
As shown in fig. 8, 9, 10 and 11, in the present embodiment, one end of the conductive member 83 is electrically connected to the electric contact 60/the first end 61, the other end of the conductive member 83 is electrically connected to the sealing member 15, and optionally, the conductive member 83 is connected to the electric contact 60 at the first end 61; the conductive member 83 and the cleaning blade 13 are located upstream and downstream of the opening, respectively, in the rotational direction of the photosensitive drum 12; as shown in fig. 4, the conductive member 83 is located on the front side of the opening 16 in the front-rear direction, so that the charging operation of the conductive member 83 to the photosensitive drum 12 is performed separately from the cleaning operation of the blade 132 to remove the waste developer 17, the charging operation of the conductive member 83 to the photosensitive drum 12 is performed first, and the cleaning operation of the blade 132 to remove the waste developer 17 is performed later; an electric field force F is formed between the photosensitive drum 12 and the waste developer 17, under which force F the waste developer 17 enters the waste developer hopper 14 through the opening 16, and then the surface of the photosensitive drum 12 is cleaned once more by the cleaning blade 13, so that the photosensitive drum 12 can be cleaned more thoroughly.
In the present embodiment, the electric power of the image forming apparatus is transmitted to the photosensitive drum 12 through the electric contact connecting portion 60, the conductive member 83, the sealing member 15; the sealing member 15 is made of a conductive material and has conductivity.
In some embodiments, the seal 15 may act as the conductive member 83, in which case the conductive member 83 may be integral with the seal 15.
In some embodiments, the conductive element 83 and the seal 15 may be two components that are connected to each other.
In some embodiments, the sealing member 15 is provided as a conductive rubber having elasticity as compared to a sheet-like sealing member, which can ensure better sealing between the photosensitive drum 12 and the drum housing 11, while reducing the installation requirement of the sealing member 15, since even if a slight deviation occurs in the installation position of the conductive rubber or a wave occurs on the surface of the conductive rubber, the sealing property of the conductive rubber is not affected.
In the present invention, the conductive members 83 in the first and second embodiments may be provided at the same time, that is, the conductive members 83 are located on at least one of the two sides of the opening 16 in the left-right direction, or the conductive members 83 are located on at least one of the two sides of the opening 16 in a direction non-parallel to the rotation axis M of the photosensitive drum 12, and the conductive members 83 may be provided as conductive metal members.
In the present invention, the conductive member 83 may be provided at other positions of the drum housing 11 than the cleaning blade 13 or the sealing member 15, for example, the conductive member 83 may be directly mounted on the drum housing 11 such that the conductive member 83 is directly in contact with the photosensitive drum 11, or the conductive member 83 is still in contact with the cleaning blade 13 or the sealing member 15.
In some embodiments, when the conductive member 83 may also be indirectly mounted to the drum housing 11 by other means, the conductive member 83 should also be considered to be disposed on the drum housing 11. The drum unit 10 of the present invention is applicable to both an integral type process cartridge, which is a product in which the developing unit 20 and the drum unit 10 are used and replaced as a unit, and a separate type process cartridge, the drum unit 10 being to be detachably mounted to the image forming apparatus together with the developing unit 20; the separate type process cartridge refers to a product in which the developing unit 20 and the drum unit 10 are usable and replaceable, respectively, and the drum unit 20 may be detachably mounted to the image forming apparatus together with the developing unit 20, may be independently detachably mounted to the image forming apparatus, and may be pre-positioned in the image forming apparatus.
[ Advantageous effects ]
Compared with the prior art, the processing box 100 provided by the invention has the following beneficial effects:
In the first aspect, the drum unit 10 of the present invention does not use the charging roller to charge the photosensitive drum 12 any more, but uses the conductive member 83 to charge the photosensitive drum 12, the drum unit 10 does not provide the charging roller, and the production cost of the drum unit 10 is saved; in addition, the conductive member 83 in the drum unit 10 of the present invention is provided on the cleaning blade 13 or the sealing member 15, or the conductive member 83 is provided integrally with the cleaning blade 13 or the sealing member 15, so that the arrangement can ensure that the photosensitive drum 12 is charged and the difficulty in mounting the conductive member 13 can be reduced.
In the second aspect, in the drum unit 10 provided in the second embodiment, the charging operation of the conductive member 83 to the photosensitive drum 12 is performed separately from the cleaning operation of the waste developer 17 by the blade 132, the photosensitive drum 12 rotates around the direction K and sequentially passes through the sealing member 15/the conductive member 83, the opening 16 and the blade 132, and when the photosensitive drum 12 reaches the opening 16, the developer is peeled off into the waste developer tank 14 by the electric field force F between the surface of the photosensitive drum 12 and the developer, and even if the non-peeled waste developer is still present on the surface of the photosensitive drum 12, the waste developer on the surface of the photosensitive drum 12 is scraped off by the blade 132, thereby making the cleaning operation of the waste developer on the surface of the photosensitive drum 12 cleaner.
Claims (10)
1. A drum unit for mounting in an image forming apparatus, the drum unit comprising:
A drum housing;
A photosensitive drum rotatably provided in the drum housing for forming an electrostatic latent image developable by a developer on a surface thereof;
A cleaning scraper fixedly arranged in the drum shell and contacted with the photosensitive drum for removing waste developer on the surface of the photosensitive drum, wherein a waste developer bin capable of containing the waste developer is formed between the cleaning scraper and the drum shell;
a sealing member for sealing between the photosensitive drum and the drum housing to prevent leakage of the waste developer, an opening communicating with the waste developer hopper being formed between the sealing member and the cleaning blade;
An electrical contact for receiving power from the imaging device;
the drum unit is provided with a conductive member connected with the electric contact member; the conductive member is located on at least one of both sides of the opening in a direction non-parallel to the rotational axis of the photosensitive drum.
2. Drum unit according to claim 1, wherein the conductive member is provided on at least one of the cleaning blade and the sealing member.
3. Drum unit according to claim 2, characterized in that the cleaning blade comprises a blade carrier and a blade arranged on the blade carrier, the conductive member being mounted on the blade carrier or the blade.
4. A drum unit according to claim 3, wherein the cleaning blade is further provided with a mounting portion by which the conductive member and the blade holder are fixed to the drum housing.
5. The drum unit according to claim 1, wherein the conductive member is provided on the drum housing, the conductive member being in direct contact with the photosensitive drum, or the conductive member being in contact with at least one of the cleaning blade and the sealing member.
6. Drum unit according to claim 2, wherein the conductive member is mounted on the sealing member, the conductive member forming an electrical connection with the sealing member.
7. Drum unit according to claim 6, wherein the conductive element is integrally formed with the sealing element.
8. A drum unit according to claim 7, wherein the conductive member and the cleaning blade are located upstream and downstream of the opening, respectively, in a rotational direction of the photosensitive drum.
9. Drum unit according to any one of claims 1-8, wherein the conductive member is provided as a conductive rubber or conductive metal member.
10. A process cartridge detachably mountable to an image forming apparatus, comprising a developing unit and the drum unit according to any one of claims 1 to 9, the developing unit and the drum unit being connected to each other, the developing unit being for accommodating a developer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410300277.XA CN118011747A (en) | 2024-03-15 | 2024-03-15 | Drum unit and process cartridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410300277.XA CN118011747A (en) | 2024-03-15 | 2024-03-15 | Drum unit and process cartridge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118011747A true CN118011747A (en) | 2024-05-10 |
Family
ID=90950686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410300277.XA Pending CN118011747A (en) | 2024-03-15 | 2024-03-15 | Drum unit and process cartridge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118011747A (en) |
-
2024
- 2024-03-15 CN CN202410300277.XA patent/CN118011747A/en active Pending
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