JP7293887B2 - Drum cartridge and image forming device - Google Patents

Description

The present disclosure relates to a drum cartridge including a photosensitive drum and an image forming apparatus.

Conventionally, a paper dust removing roller, which is one roller of a pair of registration rollers for conveying a sheet, removes paper dust from the sheet sandwiched between the pinch roller and the paper dust removing roller. A drum cartridge is known that includes a storage section that stores the removed paper dust (Patent Document 1). Also known is a drum cartridge that includes a cleaning roller that collects paper dust adhering to the surface of a photosensitive drum, and a storage section that stores paper dust scraped off from the cleaning roller (Patent Document 2).

JP 2013-076877 A JP 2013-182009 A

However, with the configuration of Patent Document 1, the paper dust adhering to the photosensitive drum cannot be recovered by exchanging the drum cartridge. Further, in the configuration of Patent Document 2, the paper dust adhering to the roller that conveys the sheet cannot be recovered by exchanging the drum cartridge.

Accordingly, an object of the present disclosure is to provide a drum cartridge and an image forming apparatus that can collect both paper dust adhering to a conveying roller and paper dust adhering to a photosensitive drum by replacing the drum cartridge.

To achieve the above object, the drum cartridge of the present disclosure includes a photosensitive drum rotatable about a first axis extending in a first direction and a first conveying roller rotatable about a second axis extending in the first direction. , a first conveying roller that conveys the sheet toward the photosensitive drum, the first conveying roller being capable of collecting paper dust from the sheet; a cleaning member that contacts the photosensitive drum and is capable of collecting paper dust from the surface of the photosensitive drum; and a second receiving portion different from the portion.

According to this configuration, the drum cartridge has two parts, namely, the first containing section that can contain the paper dust collected by the first conveying roller and the second containing section that can contain the paper dust collected by the cleaning member. Since the accommodating portions are provided, the two accommodating portions can be replaced together with the replacement of the drum cartridge. As a result, both the paper dust adhering to the first conveying roller and the paper dust adhering to the photosensitive drum can be collected by exchanging the drum cartridge.

Further, the drum cartridge may include a plurality of photosensitive drums, and the plurality of photosensitive drums may be arranged in a second direction crossing the first direction.

Further, the cleaning member can be configured to contact the photosensitive drum positioned closest to the first conveying roller in the second direction.

According to this, in the sheet conveying direction from the first conveying roller toward the photosensitive drum, paper dust is prevented from adhering to the photosensitive drum positioned downstream of the photosensitive drum positioned furthest upstream. be able to.

The second direction may be orthogonal to the first direction.

Further, the drum cartridge can be configured to be detachable from the housing of the image forming apparatus.

Further, the first conveying roller contacts the second conveying roller of the image forming apparatus in a state in which the drum cartridge is attached to the housing, and conveys the sheet toward the photosensitive drum while sandwiching the sheet between the second conveying roller and the second conveying roller. It can be configured to

Further, the drum cartridge can be configured such that a toner cartridge containing toner is detachable.

Also, the photosensitive drum can be configured to be positioned between the first conveying roller and the cleaning member in a second direction that intersects with the first direction.

Further, the volume of the first accommodation portion can be configured to be larger than the volume of the second accommodation portion.

According to this, it is possible to increase the storage capacity of the first storage section, which collects more paper dust than the second storage section.

The first conveying roller can electrically attract and collect paper dust on the sheet, the cleaning member can electrically attract and collect paper dust on the photosensitive drum, and the first conveying roller can The force for attracting paper dust can be configured to be greater than the force for attracting paper dust by the cleaning member.

According to this, large paper dust can be collected by the first conveying roller, and small paper dust that has not been collected by the first conveying roller can be collected by the cleaning member.

Further, the drum cartridge includes a triboelectric charging member that contacts the first conveying roller, and the first conveying roller is charged by contact with the triboelectric charging member, and electrically attracts and collects paper dust on the sheet. can do.

According to this, it is possible to ensure the force of the first transport roller to attract paper dust with a simpler configuration than applying a bias to the first transport roller.

Also, the triboelectric charging member may be configured by a sponge.

Further, the first conveying roller may have a roller body made of metal and a coating layer made of fluorine resin covering the outer peripheral surface of the roller body.

Further, the first container has a receiving port capable of receiving paper dust collected by the first transport roller, and the drum cartridge includes a film closing a gap between the first transport roller and the edge of the receiving port. can be configured to include

According to this, it is possible to suppress leakage of the paper dust accommodated in the first accommodation portion to the outside from the inlet.

Also, the cleaning member may be a cleaning roller rotatable about a third axis extending in the first direction.

Also, the cleaning roller can be configured to electrically attract and collect paper dust on the photosensitive drum by application of a bias.

Further, the drum cartridge is a collection roller that is rotatable about a fourth shaft extending in the first direction, is a collection roller that scrapes paper dust from the cleaning roller by coming into contact with the cleaning roller, and is provided with a collection roller made of metal. can be configured.

Further, the drum cartridge can be configured to include a paper dust scraping member that contacts the collecting roller and scrapes paper dust from the collecting roller.

Moreover, the paper dust scraping member can be configured by a sponge.

In order to achieve the object described above, the image forming apparatus of the present disclosure includes a housing, the drum cartridge described above, and a second conveying roller rotatable about a fifth axis extending in a first direction, the housing comprising: and a second transport roller supported by the

According to this configuration, both the paper dust adhering to the first conveying roller and the paper dust adhering to the photosensitive drum can be collected by exchanging the drum cartridge.

According to the present disclosure, both paper dust adhering to the first transport roller and paper dust adhering to the photosensitive drum can be collected by replacing the drum cartridge.

1 is a cross-sectional view of an image forming apparatus according to an embodiment; FIG. 1 is a perspective view of a drum cartridge according to an embodiment; FIG. 4 is a cross-sectional view of a drum cartridge; FIG. 4 is an enlarged cross-sectional view of a drum cartridge; FIG.

Next, an embodiment of the present disclosure will be described in detail with reference to the drawings as appropriate.
As shown in FIG. 1 , the image forming apparatus 1 includes a housing 10 , a sheet feeding section 20 , an image forming section 30 and a sheet discharging section 90 .

In the following description, the axial direction of the photosensitive drum 51 is defined as the first direction (see FIG. 2). A direction intersecting with the first direction is defined as a second direction. Preferably, the second direction is orthogonal to the first direction. A direction intersecting the first direction and the second direction is defined as a third direction. Preferably, the third direction is orthogonal to the first direction and the second direction.

The housing 10 has a cover 11 on one side in the second direction and a discharge tray 12 on one side in the third direction.

The sheet supply unit 20 includes a sheet tray 21 that stores sheets S such as paper, a pickup roller 22 , a separation roller 23 , a separation pad 24 , a conveying roller 25 and a second conveying roller 26 . The sheet tray 21 is positioned on the other side in the third direction inside the housing 10 .

The sheet supply unit 20 feeds the sheets S in the sheet tray 21 by the pickup roller 22 and separates them one by one by the separation roller 23 and the separation pad 24 . Then, the sheet supply unit 20 conveys the sheet S toward the photosensitive drum 51 by the conveying roller 25, the second conveying roller 26, and the first conveying roller 110, which will be described later.

The second conveying roller 26 is a roller rotatable about a fifth shaft 26X (see FIG. 4) extending in the first direction, and is supported by the housing 10. As shown in FIG. The second conveying roller 26 conveys the sheet S toward the photosensitive drum 51 while regulating the position of the leading edge of the sheet S while being in contact with the first conveying roller 110 .

The image forming section 30 includes an exposure device 40 , a drum cartridge 50 , a plurality of toner cartridges 60 , a transfer unit 70 and a fixing device 80 .

The exposure device 40 is positioned on one side in the third direction inside the housing 10 . The exposure device 40 exposes the surface of the photosensitive drum 51 by emitting a plurality of light beams indicated by dashed-dotted lines.

The drum cartridge 50 includes a plurality of photosensitive drums 51 , a plurality of chargers 52 corresponding to the plurality of photosensitive drums 51 , and a drum frame 53 . The drum cartridge 50 can be attached to and detached from the housing 10 of the image forming apparatus 1 in the second direction by opening the cover 11 . The drum cartridge 50 is positioned between the sheet tray 21 and the exposure device 40 while being attached to the housing 10 . A toner cartridge 60 is attachable to and detachable from the drum cartridge 50 (see FIG. 3). The drum cartridge 50 can be attached to and detached from the housing 10 with the toner cartridge 60 attached.

The photosensitive drum 51 is rotatable about a first shaft 51X (see FIG. 2) extending in the first direction. The multiple photosensitive drums 51 are arranged in the second direction. More specifically, as shown in FIG. 2, the plurality of photosensitive drums 51 includes photosensitive drums 511, 512, 513, and 514 arranged from one side to the other side in the second direction. The drum 513 and the photosensitive drum 514 are arranged in this order.

Returning to FIG. 1 , the drum frame 53 supports the plurality of photosensitive drums 51 , chargers 52 , and the toner cartridge 60 attached to the drum cartridge 50 .

The toner cartridge 60 can be attached to and detached from the housing 10 together with the drum cartridge 50 in a state of being attached to the drum cartridge 50 . The plurality of toner cartridges 60 contain toners of different colors such as yellow, magenta, cyan, and black. The toner cartridge 60 includes a developing roller 61 , a supply roller 62 , a layer thickness regulating blade 63 , a toner containing portion 64 containing toner, and an agitator 65 .

The toner cartridge 60 supplies the toner in the toner containing portion 64 to the supply roller 62 and supplies the toner from the supply roller 62 to the developing roller 61 while being agitated by the agitator 65 . As the developing roller 61 rotates, the toner cartridge 60 allows the toner supplied to the developing roller 61 to enter between the developing roller 61 and the layer thickness regulating blade 63 and develop into a thin layer having a constant thickness. It is carried on rollers 61 .

The transfer unit 70 is positioned between the sheet tray 21 and the drum cartridge 50 attached to the housing 10 . The transfer unit 70 includes a driving roller 71 , a driven roller 72 , a conveying belt 73 and a plurality of transfer rollers 74 . The driving roller 71 and the driven roller 72 are spaced apart in the second direction. The conveying belt 73 is an endless belt and stretched between the driving roller 71 and the driven roller 72 . The transfer roller 74 is positioned inside the conveying belt 73 and sandwiches the conveying belt 73 with the photosensitive drum 51 .

The fixing device 80 is located inside the housing 10 and on the other side of the transfer unit 70 in the second direction. The fixing device 80 includes a heating roller 81 that heats the sheet S and a pressure roller 82 that presses the heating roller 81 .

The image forming unit 30 charges the surface of the photosensitive drum 51 with the charger 52 and exposes the surface of the photosensitive drum 51 with the exposure device 40 . Thereby, an electrostatic latent image is formed on the photosensitive drum 51 . Next, the image forming section 30 supplies toner from the developing roller 61 to the photosensitive drum 51 . As a result, the electrostatic latent image on the photosensitive drum 51 is visualized and a toner image is formed on the photosensitive drum 51 .

Next, the image forming section 30 transfers the toner image on the photosensitive drum 51 onto the sheet S by conveying the sheet S supplied from the sheet supply section 20 between the photosensitive drum 51 and the transfer roller 74 . Then, the image forming section 30 conveys the sheet S onto which the toner image has been transferred between the heating roller 81 and the pressure roller 82 to thermally fix the toner image on the sheet S and form an image on the sheet S. do.

The sheet discharge section 90 has a conveying roller 91 and a discharge roller 92 . The conveying roller 91 conveys the sheet S on which an image is formed toward the discharge roller 92 . The discharge roller 92 discharges the sheet S onto the discharge tray 12 of the housing 10 .

As shown in FIGS. 2 and 3, the drum cartridge 50 includes a plurality of photosensitive drums 51 and chargers 52, as well as a first cleaning unit 100, a second cleaning unit 200, and a plurality of second cleaning rollers 310. Prepare more.

As shown in FIG. 4, the first cleaning unit 100 is a device that collects paper dust adhering to the sheet S. As shown in FIG. The first cleaning unit 100 includes a first conveying roller 110 , a first storage section 120 , a triboelectric charging member 130 , a film 140 and an auger 150 .

The first transport roller 110 is a roller rotatable about a second axis 110X extending in the first direction, and is positioned at one end of the drum frame 53 in the second direction. The first conveying roller 110 is positioned upstream of the plurality of photosensitive drums 51 in the sheet S conveying direction. That is, the first transport roller 110 is positioned at one end of the drum frame 53 in the second direction.

The first conveying roller 110 conveys the sheet S toward the photosensitive drum 51 . Specifically, the first conveying roller 110 comes into contact with the second conveying roller 26 of the image forming apparatus 1 while the drum cartridge 50 is attached to the housing 10 of the image forming apparatus 1, and moves the sheet S to the second conveying roller. 26 and conveyed toward the photosensitive drum 51 .

The first transport roller 110 has a roller body 111 and a coat layer 112 . The roller body 111 is made of metal. The coat layer 112 is a layer that covers the outer peripheral surface of the roller body 111 and is made of fluororesin.

The first conveying roller 110 can collect paper dust from the sheet S conveyed between the second conveying roller 26 and the first conveying roller 110 . Specifically, the first conveying roller 110 can electrically attract the paper dust on the sheet S and collect it. Specifically, the outer peripheral surface of the first conveying roller 110 is charged with a polarity opposite to the charging characteristic of the paper dust by contact with the frictional charging member 130, thereby electrically attracting the paper dust on the sheet S. to recover.

The first container 120 has a box shape and can contain paper dust collected by the first transport roller 110 . The first accommodation section 120 has an accommodation space capable of accommodating paper dust. In addition, the first housing portion 120 has a receiving port 121 positioned on the other side in the third direction. The receiving port 121 is an opening capable of receiving paper dust collected by the first transport roller 110 . The first transport roller 110 is positioned at the receiving port 121 .

The frictional charging member 130 is positioned inside the first housing portion 120 and is in contact with the first transport roller 110 . Specifically, the frictional charging member 130 is in contact with the first conveying roller 110 while being pressed by a spring 160 located inside the first accommodating portion 120 . The triboelectric charging member 130 is made of sponge. The frictional charging member 130 comes into contact with the first transport roller 110 to charge the outer peripheral surface of the first transport roller 110 and scrape off the paper dust collected by the first transport roller 110 from the first transport roller 110 . The paper dust scraped off from the first conveying roller 110 is stored in the first storage section 120 .

The film 140 closes the gap between the first transport roller 110 and the edge of the receiving port 121 . The film 140 is made of resin. One end of the film 140 is fixed to the edge of the inlet 121 , and the other end of the film 140 is in contact with the outer peripheral surface of the first transport roller 110 .

The auger 150 is positioned inside the first container 120 and is capable of transporting paper dust contained in the first container 120 . The auger 150 has an auger shaft 151 extending in a first direction and wings 152 spirally formed around the auger shaft 151 . The auger shaft 151 is rotatable about a sixth axis 151X extending in the first direction. The wings 152 are capable of transporting the paper dust contained in the first container 120 from near the center of the first container 120 in the first direction toward both sides.

The second cleaning unit 200 is a device that collects paper dust adhering to the surface of the photosensitive drum 51 (511). The second cleaning unit 200 includes a first cleaning roller 210 as a cleaning member, a second storage section 220 , a collection roller 230 and a paper dust scraping member 240 .

The first cleaning roller 210 is a cleaning roller rotatable about a third axis 210X extending in the first direction. The first cleaning roller 210 has a shaft 211 and a roller body 212 covering the shaft 211 . The shaft 211 is made of metal, and the roller body 212 is made of rubber.

The first cleaning roller 210 contacts the photosensitive drum 51 . Specifically, the first cleaning roller 210 contacts the photosensitive drum 511 positioned closest to the first conveying roller 110 in the second direction among the plurality of photosensitive drums 51 arranged in the second direction. That is, the first cleaning roller 210 comes into contact with the photosensitive drum 511 located on the most upstream side in the sheet S conveying direction.

In this embodiment, the second cleaning unit 200 including the first cleaning roller 210 is provided only for the photosensitive drum 511 and is not provided for the photosensitive drums 512 , 513 and 514 .

The first cleaning roller 210 is positioned on the other side of the photosensitive drum 511 in the second direction. On the other hand, the first conveying roller 110 is positioned on one side of the photosensitive drum 511 in the second direction. Therefore, the photosensitive drum 511 with which the first cleaning roller 210 contacts is positioned between the first conveying roller 110 and the first cleaning roller 210 in the second direction.

The first cleaning roller 210 can collect paper dust from the surface of the photosensitive drum 511 . Specifically, the first cleaning roller 210 can electrically attract and collect paper dust on the photosensitive drum 511 . Specifically, the first cleaning roller 210 electrically attracts and collects the paper dust on the photosensitive drum 511 by applying a bias having a polarity opposite to the charging characteristics of the paper dust to the shaft 211 .

Here, in the present embodiment, the force with which the first conveying roller 110 of the first cleaning unit 100 attracts paper dust is greater than the force with which the first cleaning roller 210 of the second cleaning unit 200 attracts paper dust. It's becoming

The second container 220 has a box shape and can contain paper dust collected by the first cleaning roller 210 . The second accommodation section 220 has an accommodation space capable of accommodating paper dust. The second storage portion 220 is a portion that stores paper dust different from the first storage portion 120 of the first cleaning unit 100 . That is, the drum cartridge 50 has two different paper dust containing portions, the first containing portion 120 and the second containing portion 220 . In this embodiment, the volume of the first accommodation portion 120 is larger than the volume of the second accommodation portion 220 . Here, the volume of the accommodation portions 120 and 220 is the volume of the accommodation space of the accommodation portions 120 and 220 .

The collection roller 230 is a roller rotatable about a fourth axis 230X extending in the first direction. The collection roller 230 is positioned inside the second housing portion 220 and is in contact with the first cleaning roller 210 . Collection roller 230 is made of metal. The collection roller 230 rotates in the same direction as the first cleaning roller 210 to scrape off paper dust adhering to the outer peripheral surface of the first cleaning roller 210 from the first cleaning roller 210 .

The paper dust scraping member 240 is located inside the second container 220 and is in contact with the collection roller 230 . The paper dust scraping member 240 is made of sponge. The paper dust scraping member 240 scrapes paper dust adhering to the outer peripheral surface of the collection roller 230 from the collection roller 230 . The paper dust scraped off by the collection roller 230 is stored in the second storage section 220 .

As shown in FIG. 3, the second cleaning roller 310 is a roller rotatable about a seventh axis 310X extending in the first direction. The second cleaning roller 310 has a metal shaft 311 and a rubber roller body 312 covering the shaft 311 . In this embodiment, the second cleaning roller 310 is the same component as the first cleaning roller 210 .

The second cleaning roller 310 contacts the photosensitive drum 51 . Specifically, the second cleaning roller 310 contacts the photosensitive drums 512 , 513 , and 514 of the plurality of photosensitive drums 51 that are located downstream of the photosensitive drum 511 in the sheet S conveying direction. The image forming apparatus 1 includes three second cleaning rollers 310 corresponding to the photosensitive drums 512 , 513 and 514 .

The second cleaning roller 310 can collect paper dust from the surfaces of the photosensitive drums 512 , 513 and 514 . Specifically, similarly to the first cleaning roller 210, the second cleaning roller 310 electrically removes the paper dust on the photosensitive drums 512, 513, and 514 by applying a bias having a polarity opposite to the charging characteristics of the paper dust to the shaft 311. It can be collected by pulling it to

According to the present embodiment described above, the drum cartridge 50 includes the first storage section 120 capable of storing paper dust collected by the first transport roller 110 and the paper dust collected by the first cleaning roller 210. Since the second housing portion 220 is provided, the two housing portions 120 and 220 can be replaced together with the replacement of the drum cartridge 50 . As a result, both the paper dust adhering to the first transport roller 110 and the paper dust adhering to the photosensitive drum 511 can be collected by replacing the drum cartridge 50 .

Further, for example, Japanese Patent Application Laid-Open No. 2010-235248 discloses an image forming apparatus including a pair of registration rollers and a storage section for storing paper dust, wherein paper dust adhering to a sheet is removed by one of the registration rollers. , the paper dust collected on the outer peripheral surface of the registration roller is scraped off with a sponge, and then the scraped paper dust is transported to a storage unit by an auger. In such a configuration, since the storage section for paper dust of the image forming apparatus cannot be taken out, the volume of the storage section for paper dust is adjusted so that the storage section does not become full before the end of the life of the image forming apparatus. had to be increased.

On the other hand, according to the present embodiment, since the drum cartridge 50, which is a replacement part, is provided with the first containing portion 120 and the second containing portion 220 capable of containing paper dust, the capacities of the containing portions 120 and 220 are increased more than necessary. no need to keep Thereby, the volume of the accommodating part 120,220 can be made small. In addition, since the storage section for paper dust is divided into the first storage section 120 and the second storage section 220, the volume of each storage section 120, 220 can be reduced.

In addition, since the first cleaning roller 210 contacts the photosensitive drum 511 positioned closest to the first conveying roller 110 , paper dust is removed in the conveying direction of the sheet S from the first conveying roller 110 toward the photosensitive drum 51 . , adhesion to the photosensitive drums 512, 513, and 514 positioned downstream of the photosensitive drum 511 positioned furthest upstream can be suppressed.

In addition, since the force with which the first conveying roller 110 attracts paper dust is greater than the force with which the first cleaning roller 210 attracts paper dust, the first conveying roller 110 located upstream in the sheet S conveying direction can move a large sheet of paper. Powder, for example, fibrous paper dust is collected, and small paper dust, for example, fine paper dust that cannot be completely collected by the first conveying roller 110 is collected by the first cleaning roller 210 positioned on the downstream side. be able to.

In addition, since the volume of the first storage portion 120 is larger than the volume of the second storage portion 220, more paper dust than the second storage portion 220 can be collected by being positioned on the upstream side in the conveying direction of the sheet S. The storage capacity of the first storage portion 120 can be increased. In particular, in the present embodiment, the storage capacity of the first storage unit 120 that stores large paper dust collected by the first transport roller 110 that is located on the upstream side in the transport direction of the sheet S and has a large force to attract paper dust is increased. be able to.

In addition, since the first transport roller 110 is charged by contact with the frictional charging member 130 to electrically attract and collect paper dust on the sheet S, for example, a bias is applied to the first transport roller 110 . With a simpler configuration, the first conveying roller 110 can secure the force to attract paper dust.

Further, since the drum cartridge 50 includes the film 140 that closes the gap between the first conveying roller 110 and the edge of the receiving port 121 of the first container 120, the paper dust contained in the first container 120 is removed. Leakage to the outside from the receiving port 121 can be suppressed.

Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above-described embodiment, and can be implemented with appropriate modifications.

For example, in the above embodiments, the first cleaning roller 210 (cleaning roller) was used as the cleaning member, but the cleaning member may be a cleaning blade or the like.

Also, the cleaning units 100 and 200 are not limited to the configurations of the above embodiments. For example, the member that removes paper dust from the first transport roller 110 may be a roller, a blade, or the like instead of the triboelectric charging member 130 . Alternatively, the film 140 may not be provided as long as the paper dust is less likely to leak from the first housing portion 120 . Also, the first cleaning unit 100 may be configured without the auger 150 . Also, the volume of the first accommodation portion 120 and the volume of the second accommodation portion 220 may be substantially the same.

Also, in the above-described embodiment, the second cleaning unit 200 is provided corresponding to the photosensitive drum 511 , but may be provided corresponding to the other photosensitive drums 512 , 513 , and 514 . Further, although only one second cleaning unit 200 is provided in the above embodiment, a plurality of second cleaning units 200 may be provided.

Further, in the above-described embodiment, the image forming apparatus 1 and the drum cartridge 50 that are provided with four photosensitive drums 51 and print a color image using toner of four colors are exemplified. It may also be an image forming apparatus and a drum cartridge that print a color image using . Alternatively, the image forming apparatus and the drum cartridge may include only one photosensitive drum and print a monochrome image. Further, the image forming apparatus may be a printer, or may be a multi-function machine or copier equipped with a document reading device such as a flatbed scanner.

Moreover, each element described in the above-described embodiment and modifications can be implemented in combination as appropriate.

1 image forming apparatus 10 housing 26 second conveying roller 26X fifth shaft 50 drum cartridge 51, 511 photosensitive drum 51X first shaft 60 toner cartridge 110 first conveying roller 110X second shaft 111 roller body 112 coating layer 120 first accommodation Section 121 Receiving Port 130 Frictional Charging Member 140 Film 210 First Cleaning Roller 210X Third Shaft 220 Second Storage Section 230 Collection Roller 230X Fourth Shaft 240 Paper Dust Scraping Member S Sheet

Claims (20)

a photosensitive drum rotatable about a first axis extending in a first direction;
A first conveying roller rotatable about a second shaft extending in the first direction, conveying a sheet toward the photosensitive drum, and capable of collecting paper dust from the sheet. and,
a first container capable of containing paper dust collected by the first transport roller;
a cleaning member that contacts the photosensitive drum and is capable of collecting paper dust from the surface of the photosensitive drum;
a second containing portion capable of containing paper dust collected by the cleaning member, the second containing portion being different from the first containing portion;
a triboelectric charging member in contact with the first transport roller;
comprising a spring and
the first conveying roller is electrified by contact with the triboelectrifying member and electrically attracts and collects paper dust on the sheet;
The drum cartridge , wherein the spring presses the frictional charging member against the first conveying roller . comprising a plurality of the photosensitive drums,
2. The drum cartridge according to claim 1, wherein the plurality of photosensitive drums are arranged in a second direction crossing the first direction. 3. The drum cartridge according to claim 2, wherein the cleaning member contacts the photosensitive drum positioned closest to the first conveying roller in the second direction. 4. A drum cartridge according to claim 2, wherein said second direction is perpendicular to said first direction. 5. The drum cartridge according to any one of claims 1 to 4, wherein the drum cartridge is attachable to and detachable from a housing of an image forming apparatus. The first conveying roller contacts a second conveying roller of the image forming apparatus in a state in which the drum cartridge is attached to the housing, and sandwiches the sheet between the first conveying roller and the second conveying roller, thereby conveying the sheet to the photosensitive drum. 6. The drum cartridge according to claim 5, wherein the drum cartridge is conveyed toward the 7. The drum cartridge according to claim 1, wherein the toner cartridge containing toner is detachable. 8. The photosensitive drum according to any one of claims 1 to 7, wherein the photosensitive drum is positioned between the first conveying roller and the cleaning member in a second direction that intersects with the first direction. drum cartridge. 9. A drum cartridge according to any one of claims 1 to 8, wherein the volume of said first accommodating portion is larger than the volume of said second accommodating portion. The first conveying roller is capable of electrically attracting and collecting paper dust on the sheet,
The cleaning member is capable of electrically attracting and collecting paper dust on the photosensitive drum,
10. The drum cartridge according to any one of claims 1 to 9, wherein the force with which the first conveying roller attracts paper dust is greater than the force with which the cleaning member attracts paper dust. The frictional charging member scrapes paper dust collected by the first transport roller from the first transport roller,
11. The drum cartridge according to any one of claims 1 to 10, wherein the first containing portion is capable of containing paper dust scraped off from the first conveying roller. 12. A drum cartridge according to any one of claims 1 to 11 , wherein said frictional charging member is made of sponge. 13. The first conveying roller according to any one of claims 1 to 12, wherein the first conveying roller has a roller body made of metal and a coating layer made of fluorine resin covering an outer peripheral surface of the roller body. drum cartridge. The first container has a receiving port capable of receiving paper dust collected by the first transport roller,
14. The drum cartridge according to any one of claims 1 to 13, further comprising a film that seals a gap between the first conveying roller and the edge of the receiving port. 15. A drum cartridge according to any one of claims 1 to 14, wherein said cleaning member is a cleaning roller rotatable about a third axis extending in said first direction. 16. A drum cartridge according to claim 15, wherein said cleaning roller electrically attracts and collects paper dust on said photosensitive drum by application of a bias. A recovery roller rotatable about a fourth shaft extending in the first direction, the recovery roller contacting the cleaning roller to scrape off paper dust from the cleaning roller, and comprising a recovery roller made of metal. 17. The drum cartridge according to claim 15 or 16, wherein 18. The drum cartridge according to claim 17, further comprising a paper dust scraping member that contacts the collecting roller and scrapes paper dust from the collecting roller. 19. A drum cartridge according to claim 18, wherein said paper dust scraping member is made of sponge. a housing;
A drum cartridge according to any one of claims 1 to 19;
An image forming apparatus, comprising: a second conveying roller rotatable about a fifth axis extending in the first direction, the second conveying roller being supported by the housing.

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