JP7367318B2 - Image forming device and drum cartridge - Google Patents

Description

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

Conventionally, an image forming apparatus includes a housing, a photosensitive drum, a charging roller, a developing roller, and a transfer roller. The housing can accommodate negatively charged toner. A toner image made of toner is formed on the surface of the photosensitive drum. The charging roller negatively charges the surface of the photosensitive drum. The developing roller can supply the toner inside the housing to the surface of the photosensitive drum. The transfer roller can transfer the toner image from the surface of the photosensitive drum to the sheet.

The developing roller collects residual toner remaining on the surface of the photosensitive drum without being transferred to the sheet, from the surface of the photosensitive drum to the housing (see Patent Document 1 below).

Japanese Patent Application Publication No. 2006-11137

As described in Patent Document 1 mentioned above, in an image forming apparatus that uses negatively charged toner and adopts a so-called cleanerless development method, as the number of printed sheets increases, filming occurs on the surface of the photosensitive drum. Or, the charging roller may be contaminated with residual toner or paper dust. If filming occurs on the surface of the photosensitive drum or the charging roller becomes dirty, image quality may deteriorate.

SUMMARY OF THE INVENTION Therefore, an object of the present disclosure is to provide an image forming apparatus and a drum cartridge that can suppress filming on the surface of a photosensitive drum and soiling of a charging roller, and can collect remaining toner using a developing roller. be.

(1) The image forming apparatus of the present disclosure includes a housing, a photosensitive drum, a developing roller, a transfer roller, a peeling roller, a first cleaner member, a charging roller, a charging cleaning roller, and a second cleaner member. Equipped with. The casing can accommodate non-magnetic one-component negatively charged toner. A toner image made of toner is formed on the surface of the photosensitive drum. The developing roller can supply the toner inside the housing to the surface of the photosensitive drum. The transfer roller can transfer the toner image from the surface of the photosensitive drum to the sheet. The peeling roller is capable of peeling off residual toner remaining on the surface of the photosensitive drum without being transferred to the sheet, from the surface of the photosensitive drum due to the difference in circumferential speed between the peeling roller and the photosensitive drum. The peeling roller negatively charges the peeled residual toner and attaches the charged residual toner to the surface of the photosensitive drum. The first cleaner member comes into contact with the peeling roller and collects paper dust attached to the peeling roller. The charging roller negatively charges the surface of the photosensitive drum on which the remaining toner charged by the peeling roller is attached. The charging cleaning roller cleans the charging roller. The second cleaner member comes into contact with the charging cleaning roller and collects paper dust attached to the charging cleaning roller.

The developing roller collects the remaining toner charged by the peeling roller from the surface of the photosensitive drum charged by the charging roller into the housing.

According to this configuration, residual toner remaining on the surface of the photosensitive drum without being transferred to the sheet can be peeled off from the surface of the photosensitive drum by the peeling roller.

Thereby, filming on the surface of the photosensitive drum can be suppressed.

Further, according to such a configuration, the residual toner peeled off from the surface of the photosensitive drum can be applied to the surface of the photosensitive drum by being charged and collected into the housing by the developing roller.

Therefore, there is no need to separately provide a container for collecting the remaining toner.

Further, according to such a configuration, the charging cleaning roller cleans the charging roller.

This can prevent the charging roller from getting dirty.

In summary, it is possible to suppress filming on the surface of the photosensitive drum and staining of the charging roller, and to collect residual toner using the developing roller.

Further, according to such a configuration, the first cleaner member can collect the paper powder attached to the peeling roller, and the second cleaner member can collect the paper powder attached to the charging cleaning roller.

(2) The image forming apparatus may include a drum cartridge and a developer cartridge. The drum cartridge includes a photosensitive drum, a peeling roller, a first cleaner member, a charging roller, a charging cleaning roller, and a second cleaner member. The developer cartridge can be attached to the drum cartridge. The developer cartridge includes a housing and a developer roller.

(3) The drum cartridge may further include a container. The container accommodates paper powder collected by the first cleaner member and paper powder collected by the second cleaner member.

(4) The container may be located on the opposite side of the casing with respect to the photosensitive drum.

(5) The container may have a first storage part and a second storage part. The first storage section stores paper powder collected by the first cleaner member. The second storage section stores paper powder collected by the second cleaner member.

(6) The peeling roller, the first cleaner member, the charged cleaning roller, and the second cleaner member may be located on the opposite side of the casing with respect to the transfer roller.

(7) The remaining toner charged by the peeling roller may adhere to the surface of the photosensitive drum due to the potential difference with the surface of the photosensitive drum.

(8) The drum cartridge may further include a transfer roller.

(9) The first cleaner member and the second cleaner member may be cleaning rollers.

According to the image forming apparatus and drum cartridge of the present disclosure, it is possible to suppress filming on the surface of the photosensitive drum and staining of the charging roller, and also to collect residual toner using the developing roller.

FIG. 1 is a schematic configuration diagram of an image forming apparatus. FIG. 2A is an explanatory diagram for explaining the collection of remaining toner, and shows how the remaining toner adheres to the surface of the photosensitive drum. FIG. 2B is an explanatory diagram following FIG. 2A to explain the recovery of residual toner, and shows how the residual toner attached to the surface of the photosensitive drum is peeled off by a peeling roller. FIG. 3A is an explanatory diagram following FIG. 2B to explain the recovery of residual toner, and shows how the surface of the photosensitive drum on which the peeled residual toner is attached is charged by a charging roller. FIG. 3B is an explanatory diagram following FIG. 3A to explain the collection of remaining toner, and shows how the remaining toner is collected by the developing roller.

1. Outline of Image Forming Apparatus 1 The outline of the image forming apparatus 1 will be described with reference to FIG.

The image forming apparatus 1 includes a main body housing 2 , a sheet supply section 3 , a photosensitive drum 4 , a charging roller 5 , an exposure device 6 , a developer cartridge 7 , a transfer roller 8 , and a fixing device 9 . Note that in this embodiment, the image forming apparatus 1 includes a drum cartridge 10. The drum cartridge 10 includes a photosensitive drum 4, a charging roller 5, and a transfer roller 8.

1.1 Main body case 2
The main body housing 2 houses a sheet supply section 3 , a photosensitive drum 4 , a charging roller 5 , an exposure device 6 , a developer cartridge 7 , a transfer roller 8 , and a fixing device 9 .

1.2 Sheet supply section 3
The sheet supply section 3 supplies the sheet S to the photosensitive drum 4. The sheet supply section 3 includes a sheet cassette 11, a pickup roller 12, and a conveyance roller 13. The sheet cassette 11 stores sheets S. The sheet S is, for example, printing paper. The pickup roller 12 picks up the sheet S in the sheet cassette 11 and conveys the picked up sheet S toward the conveyance roller 13. The conveyance roller 13 conveys the sheet S from the pickup roller 12 toward the photosensitive drum 4 .

1.3 Photosensitive drum 4
The photosensitive drum 4 is rotatable about an axis A. Axis A extends in a first direction. The photosensitive drum 4 extends in the first direction along the axis A. The photosensitive drum 4 has a cylindrical shape.

1.4 Charging roller 5
The charging roller 5 contacts the surface of the photosensitive drum 4. A negative charging bias is applied to the charging roller 5 . The charging roller 5 to which a negative charging bias is applied negatively charges the surface of the photosensitive drum 4. The charging roller 5 is rotatable about an axis extending in the first direction.

1.5 Exposure device 6
The exposure device 6 forms an electrostatic latent image on the surface of the photosensitive drum 4 by exposing the surface of the photosensitive drum 4 charged by the charging roller 5 . Specifically, the exposure device 7 is a laser scanning unit. Note that the exposure device 7 may be an LED unit.

1.6 Developer cartridge 7
The developer cartridge 7 can be attached to the drum cartridge 10. The developing cartridge 7 has a toner storage section 14 and a developing section 15.

1.6.1 Toner storage section 14
The toner storage section 14 is mounted on the drum cartridge 10 and is located on the opposite side of the photosensitive drum 4 with respect to the developing section 15 . The toner storage section 14 includes a storage housing 14A, a supply section 14B, an agitator 14C, and an auger screw 14D.

The storage casing 14A stores non-magnetic one-component negatively charged toner. The accommodation housing 14A can accommodate an amount of toner that can be printed on 30,000 sheets S when the sheets S are for A4 size printing.

The supply section 14B supplies the toner in the housing housing 14A to the housing 15A of the developing section 15. The supply section 14B protrudes from the housing case 14A. The supply section 14B is attached to the housing 15A of the developing section 15. The supply section 14B has an internal space. The internal space of the supply section 14B communicates with the internal space of the housing case 14A. The supply section 14B has a discharge port 141 for discharging toner. In a state where the supply section 14B is attached to the housing 15A, the discharge port 141 communicates with the reception port 151 of the housing 15A. The intake port 151 will be explained later. The toner discharged from the discharge port 141 of the supply section 14B passes through the receiving port 151 and enters the housing 15A.

The agitator 14C is located within the toner storage section 14. Specifically, the agitator 14C is located within the housing casing 14A. The agitator 14C transports the toner in the housing casing 14A toward the supply section 14B. Agitator 14C is rotatable about an axis extending in the first direction.

The auger screw 14D is located within the supply section 14B. The auger screw 14D transports the toner in the supply section 14B to the discharge port 141.

1.6.2 Developing section 15
The developing section 15 is located between the photosensitive drum 4 and the toner storage section 14 . The developing section 15 supplies the toner in the toner storage section 14 to the photosensitive drum 4 . Specifically, the developing section 15 includes a housing 15A, an agitator 15B, and a developing roller 15C. That is, the developer cartridge 7 includes a housing 15A and a developer roller 15C. The image forming apparatus 1 also includes a housing 15A and a developing roller 15C.

The casing 15A can accommodate non-magnetic one-component negatively charged toner. Specifically, the housing 15A has an intake port 151. The receiving port 151 receives the toner discharged from the discharge port 141 of the toner storage section 14 . As a result, the toner discharged from the discharge port 141 of the toner storage section 14 passes through the reception port 151 and enters the housing 15A. The housing 15A accommodates toner from the toner storage section 14.

Agitator 15B is located within casing 15A. The agitator 15B transports the toner inside the housing 15A toward the developing roller 15C. Agitator 15B is rotatable about an axis extending in the first direction.

The developing roller 15C is supported by the housing 15A. When the developer cartridge 7 is attached to the drum cartridge 10, the developer roller 15C contacts the photosensitive drum 4. The developing roller 15C can supply the toner inside the housing 15A to the surface of the photosensitive drum 4. A negative developing bias is applied to the developing roller 15C. The developing roller 15C is rotatable about an axis extending in the first direction. By supplying the toner in the housing 15A to the surface of the photosensitive drum 4 by the developing roller 15C, a toner image made of the toner is formed on the surface of the photosensitive drum 4.

1.7 Transfer roller 8
Transfer roller 8 is located on the opposite side of charging roller 5 with respect to photosensitive drum 4 . Transfer roller 8 contacts photosensitive drum 4 . A positive transfer bias is applied to the transfer roller 8 . The sheet S from the sheet supply section 3 passes between the photosensitive drum 4 and the transfer roller 8. At this time, the transfer roller 8 can transfer the toner image from the surface of the photosensitive drum 4 to the sheet S using a transfer bias.

1.8 Fixing device 9
The fixing device 9 heats and presses the sheet S onto which the toner image has been transferred, thereby fixing the toner image onto the sheet S. The sheet S that has passed through the fixing device 9 is discharged onto the upper surface of the main body housing 2 .

2. Details of Image Forming Apparatus 1 Next, details of the image forming apparatus 1 will be described with reference to FIGS. 1 to 4.

As shown in FIG. 1, the image forming apparatus 1 includes a peeling roller 21, a first cleaning roller 22, a charging cleaning roller 23, a second cleaning roller 24, and a container 25. Specifically, the drum cartridge 10 includes a peeling roller 21 , a first cleaning roller 22 , a charging cleaning roller 23 , a second cleaning roller 24 , and a container 25 .

2.1 Peeling roller 21
The peeling roller 21 is located on the opposite side of the housing 15A with respect to the photosensitive drum 4 in the second direction. The second direction is the direction in which the sheet S passes between the photosensitive drum 4 and the transfer roller 8. The second direction intersects the first direction. Specifically, the second direction is perpendicular to the first direction. The peeling roller 21 is located on the opposite side of the housing 15A with respect to the axis A of the photosensitive drum 4 in the second direction. Further, the peeling roller 21 is located on the opposite side of the developing roller 15C with respect to the photosensitive drum 4 in the second direction. The peeling roller 21 is located on the opposite side of the developing roller 15C with respect to the axis A of the photosensitive drum 4 in the second direction. Further, the peeling roller 21 is located on the opposite side of the housing 15A with respect to the transfer roller 8 in the second direction. The peeling roller 21 is located on the opposite side of the developing roller 15C with respect to the transfer roller 8 in the second direction.

The peeling roller 21 contacts the surface of the photosensitive drum 4. The peeling roller 21 is rotatable about an axis extending in the first direction. Peeling roller 21 extends in the first direction. The peeling roller 21 is made of, for example, a silicone resin sponge.

The peeling roller 21 can peel off the remaining toner T from the surface of the photosensitive drum 4 due to the difference in circumferential speed between the peeling roller 21 and the photosensitive drum 4 . Note that the residual toner T is toner that remains on the surface of the photosensitive drum 4 without being transferred to the sheet S. Specifically, as shown in FIG. 2A, when the toner image formed on the surface of the photosensitive drum 4 is transferred to the sheet S, some toner in the toner image is not transferred to the sheet S and is transferred to the photosensitive drum. It remains on the surface of 4. Therefore, as shown in FIG. 2B, the peeling roller 21 peels off the remaining toner T from the surface of the photosensitive drum 4.

The peripheral speed of the peeling roller 21 is different from the peripheral speed of the photosensitive drum 4. Thereby, the peeling roller 21 rubs the surface of the photosensitive drum 4. The peeling roller 21 peels off the remaining toner T from the surface of the photosensitive drum 4 by rubbing the photosensitive drum 4 .

Further, the peeling roller 21 negatively charges the peeled residual toner T and applies the charged residual toner T to the surface of the photosensitive drum 4 . Specifically, a negative peeling roller bias is applied to the peeling roller 21. The remaining toner T peeled off from the surface of the photosensitive drum 4 by the peeling roller 21 is negatively charged by the peeling roller bias. The remaining toner T charged by the peeling roller 21 adheres to the surface of the photosensitive drum 4 due to the potential difference with the surface of the photosensitive drum 4.

Note that the absolute value of the peeling roller bias is smaller than the charging bias and larger than the developing bias. The difference between the absolute value of the peeling roller bias and the absolute value of the charging bias is, for example, 550 V or more and 700 V or less. The difference between the absolute value of the peeling roller bias and the absolute value of the developing bias is, for example, 100V or more and 250V or less.

The peeling roller bias is preferably a bias that can generate electric discharge between the peeling roller 21 and the photosensitive drum 4. With such a peeling roller bias, the remaining toner T can be more reliably charged negatively.

2.2 Regarding collection of remaining toner T After the remaining toner T is attached to the surface of the photosensitive drum 4 by the peeling roller 21, as shown in FIG. 3A, the charging roller 5 collects the remaining toner T charged by the peeling roller 21. The surface of the photosensitive drum 4 with the attached surface is negatively charged again. At this time, the remaining toner T charged by the peeling roller 21 is retained on the surface of the photosensitive drum 4 by the charging bias applied to the charging roller 5.

Thereafter, as shown in FIG. 4, the developing roller 15C collects the remaining toner T charged by the peeling roller 21 from the surface of the photosensitive drum 4 charged by the charging roller 5 into the housing 15A.

2.3 First cleaning roller 22
As shown in FIG. 2B, the first cleaning roller 22 contacts the peeling roller 21. As shown in FIG. The first cleaning roller 22 is rotatable about an axis extending in the first direction. The first cleaning roller 22 extends in a first direction along the axis. The first cleaning roller 22 has a spiral groove on its circumferential surface. The first cleaning roller 22 collects paper dust P attached to the peeling roller 21. Specifically, as shown in FIG. 2A, when the toner image is transferred from the surface of the photosensitive drum 4 to the sheet S, paper dust P from the sheet S may adhere to the surface of the photosensitive drum 4. As shown in FIG. 2B, paper powder P attached to the surface of the photosensitive drum 4 may adhere to the surface of the peeling roller 21 when the peeling roller 21 applies the remaining toner T to the surface of the photosensitive drum 4. As shown in FIG. 3A, the first cleaning roller 22 collects paper dust P attached to the surface of the peeling roller 21.

As shown in FIG. 1, the first cleaning roller 22 is located on the opposite side of the photosensitive drum 4 with respect to the peeling roller 21 in the second direction. The first cleaning roller 22 is located on the opposite side of the housing 15A with respect to the photosensitive drum 4 in the second direction. The first cleaning roller 22 is located on the opposite side of the housing 15A with respect to the axis A of the photosensitive drum 4 in the second direction. The first cleaning roller 22 is located on the opposite side of the developing roller 15C with respect to the photosensitive drum 4 in the second direction. The first cleaning roller 22 is located on the opposite side of the developing roller 15C with respect to the axis A of the photosensitive drum 4 in the second direction. The first cleaning roller 22 is located on the opposite side of the housing 15A with respect to the transfer roller 8 in the second direction. The first cleaning roller 22 is located on the opposite side of the developing roller 15C with respect to the transfer roller 8 in the second direction. The first cleaning roller 22 is an example of a first cleaner member. Note that the first cleaner member may be a cleaning blade.

2.4 Charged cleaning roller 23
As shown in FIG. 3A, the charging cleaning roller 23 comes into contact with the charging roller 5. As shown in FIG. The charging cleaning roller 23 is rotatable about an axis extending in the first direction. The charging cleaning roller 23 extends in the first direction along the axis. The charging cleaning roller 23 cleans the charging roller 5. Specifically, when the charging roller 5 negatively charges the surface of the photosensitive drum 4 on which the remaining toner T is attached, paper powder P on the surface of the photosensitive drum 4 may adhere to the charging roller 5 . Therefore, the charging cleaning roller 23 cleans the charging roller 5.

A cleaning bias is applied to the charged cleaning roller 23 . The paper powder P attached to the charging roller 5 is attached to the charging cleaning roller 23 from the charging roller 5 due to the cleaning bias. Thereby, the charging cleaning roller 23 cleans the charging roller 5.

As shown in FIG. 1, the charging cleaning roller 23 is located on the opposite side of the housing 15A to the charging roller 5 in the second direction. The charging cleaning roller 23 is located on the opposite side of the developing roller 15C to the charging roller 5 in the second direction. The charging cleaning roller 23 is located on the opposite side of the housing 15A with respect to the axis A of the photosensitive drum 4 in the second direction. The charging cleaning roller 23 is located on the opposite side of the developing roller 15C with respect to the axis A of the photosensitive drum 4 in the second direction. The charging cleaning roller 23 is located on the opposite side of the housing 15A to the transfer roller 8 in the second direction. The charging cleaning roller 23 is located on the opposite side of the developing roller 15C with respect to the transfer roller 8 in the second direction.

2.5 Second cleaning roller 24
The second cleaning roller 24 comes into contact with the charging cleaning roller 23, as shown in FIG. 3A. The second cleaning roller 24 is rotatable about an axis extending in the first direction. The second cleaning roller 24 extends in the first direction along the axis. The second cleaning roller 24 has a spiral groove on its circumferential surface. The second cleaning roller 24 collects paper powder P attached to the charging cleaning roller 23, as shown in FIGS. 3A and 3B.

As shown in FIG. 1, the second cleaning roller 24 is located on the opposite side of the charging roller 5 with respect to the charging cleaning roller 23 in the second direction. The second cleaning roller 24 is located on the opposite side of the housing 15A with respect to the photosensitive drum 4 in the second direction. The second cleaning roller 24 is located on the opposite side of the housing 15A with respect to the axis A of the photosensitive drum 4 in the second direction. The second cleaning roller 24 is located on the opposite side of the developing roller 15C with respect to the photosensitive drum 4 in the second direction. The second cleaning roller 24 is located on the opposite side of the developing roller 15C with respect to the axis A of the photosensitive drum 4 in the second direction. The second cleaning roller 24 is located on the opposite side of the housing 15A with respect to the transfer roller 8 in the second direction. The second cleaning roller 24 is located on the opposite side of the developing roller 15C with respect to the transfer roller 8 in the second direction. The second cleaning roller 24 is an example of a second cleaner member. Note that the second cleaner member may be a cleaning blade.

2.6 Container 25
As shown in FIG. 1, the container 25 is located on the opposite side of the housing 15A with respect to the photosensitive drum 4 in the second direction. The container 25 is located on the opposite side of the housing 15A with respect to the axis A of the photosensitive drum 4 in the second direction. The container 25 is located on the opposite side of the developing roller 15C with respect to the photosensitive drum 4 in the second direction. The container 25 is located on the opposite side of the developing roller 15C with respect to the axis A of the photosensitive drum 4 in the second direction. The container 25 accommodates the paper powder P collected by the first cleaning roller 22 and the paper powder P collected by the second cleaning roller 24. Specifically, the container 25 has a first accommodating part 25A and a second accommodating part 25B. The container 25 is partitioned into a first storage part 25A and a second storage part 25B.

The first cleaning roller 22 is located within the first storage portion 25A. The first storage section 25A stores paper powder P collected by the first cleaning roller 22.

A second cleaning roller 24 is located within the second storage portion 25B. The second storage section 25B stores paper powder P collected by the second cleaning roller 24.

3. Effects According to the image forming apparatus 1, as shown in FIG. 2B, residual toner remaining on the surface of the photosensitive drum 4 without being transferred to the sheet S can be peeled off from the surface of the photosensitive drum 4 by the peeling roller 21. It is possible.

Thereby, filming on the surface of the photosensitive drum 4 can be suppressed.

Further, according to the image forming apparatus 1, as shown in FIGS. 3A and 3B, the remaining toner peeled off from the surface of the photosensitive drum 4 is applied to the surface of the photosensitive drum 4 by being charged, and the toner is removed from the housing by the developing roller 15C. It can be recovered into the body 15A.

Therefore, there is no need to separately provide a container for collecting the remaining toner.

Further, according to the image forming apparatus 1, the charging cleaning roller 23 cleans the charging roller 5, as shown in FIG. 3A.

As a result, it is possible to suppress the charging roller 5 from getting dirty. In summary, it is possible to suppress the filming on the surface of the photosensitive drum 4 and the charging roller 5 from getting dirty, and it is also possible to collect the remaining toner using the developing roller.

Further, according to the image forming apparatus 1, as shown in FIGS. 2B and 3A, paper dust attached to the peeling roller 21 can be collected by the first cleaning roller 22, and as shown in FIGS. 2 cleaning roller 24 can collect paper dust attached to the charged cleaning roller 23.

4. Modifications The image forming apparatus 1 may include a toner cartridge that can be attached to the developer cartridge 7. Specifically, the developer cartridge 7 includes the above-described housing 15A and the developer roller 15C. The toner cartridge can be attached to the housing 15A of the developer cartridge 7. The toner cartridge accommodates toner to be supplied to the housing 15A.

Further, the drum cartridge 10 may include a photosensitive drum 4, a charging roller 5, a developing device, and a transfer roller 8. The developing device includes a housing 15A and a developing roller 15C. In this case, the image forming apparatus 1 may include a toner cartridge that can be attached to the drum cartridge 10.

Further, the image forming apparatus 1 may include a cartridge that integrally includes a drum unit and a developing device. The drum unit includes a photosensitive drum 4, a charging roller 5, and a transfer roller 8. The developing device includes a housing 15A and a developing roller 15C.

1 Image forming device 4 Photosensitive drum 5 Charging roller 7 Housing 8 Developing roller 9 Transfer roller 11A Drum cartridge 11B Developing cartridge 21 Peeling roller 22 First cleaning roller 23 Charging cleaning roller 24 Second cleaning roller 25 Container 25A First housing part 25B Second storage section P Paper powder S Sheet T Remaining toner

Claims (12)

a casing capable of accommodating non-magnetic one-component negatively charged toner ;
a photosensitive drum on the surface of which a toner image made of the toner is formed;
a developing roller capable of supplying the toner in the housing to the surface of the photosensitive drum;
a transfer roller capable of transferring the toner image from the surface of the photosensitive drum to the sheet;
A peeling roller capable of peeling off residual toner remaining on the surface of the photosensitive drum without being transferred to the sheet by using a peripheral speed difference between the roller and the photosensitive drum; a peeling roller that negatively charges the toner and applies the charged residual toner to the surface of the photosensitive drum;
a first cleaner member that comes into contact with the peeling roller and collects paper dust attached to the peeling roller;
a charging roller that negatively charges the surface of the photosensitive drum with the residual toner charged by the peeling roller;
a charging cleaning roller that cleans the charging roller;
a second cleaner member that comes into contact with the charged cleaning roller and collects paper dust attached to the charged cleaning roller;
The image forming apparatus is characterized in that the developing roller collects the remaining toner charged by the peeling roller from the surface of the photosensitive drum charged by the charging roller to the casing. a drum cartridge comprising the photosensitive drum, the peeling roller, the first cleaner member, the charging roller, the charging cleaning roller, and the second cleaner member;
a developer cartridge that can be attached to the drum cartridge and includes the housing and the developer roller;
The image forming apparatus according to claim 1, characterized in that the image forming apparatus comprises: 3. The drum cartridge further includes a container for accommodating paper dust collected by the first cleaner member and paper dust collected by the second cleaner member. image forming device. The image forming apparatus according to claim 3, wherein the container is located on the opposite side of the housing with respect to the photosensitive drum. The container is
a first storage section that stores paper powder collected by the first cleaner member;
5. The image forming apparatus according to claim 3, further comprising a second storage section that stores paper dust collected by the second cleaner member. The peeling roller, the first cleaner member, the charged cleaning roller, and the second cleaner member are located on the opposite side of the casing with respect to the transfer roller. The image forming apparatus according to any one of Item 5. 7. The residual toner charged by the peeling roller is attached to the surface of the photosensitive drum due to a potential difference with the surface of the photosensitive drum. Image forming device. The image forming apparatus according to any one of claims 1 to 7, wherein the first cleaner member and the second cleaner member are cleaning rollers. a photosensitive drum on which a toner image made of non-magnetic one-component negatively charged toner is formed;
a peeling roller capable of peeling off residual toner attached to the surface of the photosensitive drum from the surface of the photosensitive drum due to a peripheral speed difference with the photosensitive drum, the peeling roller negatively charging the peeled residual toner; a peeling roller that applies the charged residual toner to the surface of the photosensitive drum;
a first cleaner member that comes into contact with the peeling roller and collects paper dust attached to the peeling roller;
a charging roller that negatively charges the surface of the photosensitive drum with the residual toner charged by the peeling roller;
a charging cleaning roller that cleans the charging roller;
A drum cartridge comprising: a second cleaner member that contacts the charged cleaning roller and collects paper dust attached to the charged cleaning roller. The drum cartridge according to claim 9, further comprising a transfer roller capable of transferring the toner image from the surface of the photosensitive drum to the sheet. 11. The drum cartridge according to claim 9, wherein the remaining toner charged by the peeling roller is attached to the surface of the photosensitive drum due to a potential difference with the surface of the photosensitive drum. The drum cartridge according to any one of claims 9 to 11, wherein the first cleaner member and the second cleaner member are cleaning rollers.

Images