JP7225990B2 - image forming device - Google Patents

Description

The present invention relates to an image forming apparatus.

2. Description of the Related Art Image forming apparatuses such as copiers and printers using electrophotography are known. In this image forming apparatus, first, the surface of a rotating photoreceptor is uniformly charged, and the photoreceptor is exposed to light controlled based on image information to form an electrostatic latent image on the photoreceptor. The electrostatic latent image on the surface of the photoreceptor is developed into a toner image using a developing roll or the like of a developing device. This toner image is transferred from the photoreceptor onto a sheet of paper directly or through an intermediate transfer belt or the like. Then, the sheet onto which the toner image has been transferred is conveyed to the fixing section, and the toner image is fixed on the sheet by the fixing section.

The photoreceptor has a cylindrical or columnar substrate and a photosensitive layer provided on the surface of the substrate on the central side in the axial direction. (also called department) is provided. Since a tracking roll (a roll that maintains a constant gap between the developing roll and the photoreceptor) is in contact with the exposed surface area of the photoreceptor, the surface of the substrate may be scraped and foreign matter (metal powder, etc.) may be generated. . For this reason, conventionally, there is known a configuration in which a cleaning member that catches foreign matter by coming into contact with the blank tube portion (surface exposed region) of the photoreceptor is provided (see, for example, Japanese Laid-Open Patent Publication No. 2002-100003).

JP 2016-156896 A

For example, the cleaning member in contact with the exposed surface area of the photoreceptor is a cleaning member extending along the circumferential direction of the photoreceptor, and includes a bottom in contact with the exposed surface area and an upstream end of the bottom in the rotation direction of the photoreceptor. and a foreign matter capturing wall that rises toward the outer peripheral side of the photoreceptor and captures foreign matter adhering to the exposed surface area of the photoreceptor. With such a cleaning member, there is a possibility that the foreign matter captured by the foreign matter capturing wall may leave the cleaning member and scatter around.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image forming apparatus having a cleaning member having a foreign matter trapping wall for trapping foreign matter adhering to a surface exposed region of a photoreceptor, in which the foreign matter can be removed more effectively than in the case where the foreign matter on the foreign matter trapping wall cannot be removed. To suppress or reduce scattering around a cleaning member.

The invention according to claim 1 has a cylindrical or columnar substrate, and a photosensitive layer provided on the surface of the substrate on the central side in the axial direction, and the substrate is provided on at least one of the ends in the axial direction of the substrate. a rotatable photoreceptor having an exposed surface area; and a cleaning member for cleaning the exposed surface area, wherein the cleaning member is a main body extending along a circumferential direction of the photoreceptor, a main body having a bottom in contact with an exposed surface area, and a foreign matter capturing wall rising from the upstream end of the bottom in the rotation direction of the photoreceptor toward the outer peripheral side of the photoreceptor and capturing foreign matters on the exposed surface area; A stepped portion extending from the main body to the side opposite to the central side in the axial direction of the photoreceptor at a position on the downstream side of the main body in the rotation direction of the photoreceptor, the step being lower than the foreign matter capturing wall of the main body. and a stepped portion having a foreign matter retaining wall that rises from the inner peripheral side to the outer peripheral side of the photoreceptor and retains the foreign matter.

The invention according to claim 2 is the image forming apparatus according to claim 1, wherein the main body of the cleaning member extends obliquely downward from the foreign object trapping wall toward the foreign object retention wall. It is characterized by including a foreign object guiding wall that guides the foreign object to the foreign object retention wall.

The invention according to claim 3 is the image forming apparatus according to claim 1 or 2, wherein the foreign object capturing wall of the cleaning member is inclined downward toward the foreign object retaining wall. and

The invention according to claim 4 is the image forming apparatus according to any one of claims 1 to 3, wherein the foreign matter holding wall of the cleaning member is inclined downward toward the foreign matter capturing wall. It is characterized by

The invention according to claim 5 is the image forming apparatus according to any one of claims 1 to 4, wherein the end portion of the foreign matter trapping wall on the outer peripheral side of the photoreceptor is larger than the end portion on the inner peripheral side of the photoreceptor. and protrudes upstream in the rotation direction of the photoreceptor.

The invention according to claim 6 is the image forming apparatus according to any one of claims 1 to 5, wherein the end portion of the foreign matter retaining wall on the outer peripheral side of the photoreceptor is larger than the end portion on the inner peripheral side of the photoreceptor. and protrudes upstream in the rotation direction of the photoreceptor.

The invention according to claim 7 is the image forming apparatus according to any one of claims 1 to 6, wherein a part of the main body of the cleaning member and the photoreceptor are arranged in the axial direction of the photoreceptor. The photosensitive layer is partially overlapped.

According to the first aspect of the invention, the foreign matter on the foreign matter trapping wall can be trapped from the side opposite to the axial center side of the photoreceptor compared to the case where the foreign matter on the foreign matter trapping wall cannot be removed (dropped to the foreign matter storage wall). It is possible to suppress or reduce the scattering of foreign matter around the cleaning member.

According to the second aspect of the invention, foreign matter is guided from the foreign matter trapping wall to the foreign matter retention wall.

According to the third aspect of the invention, foreign matter is more likely to fall from the foreign matter trapping wall to the foreign matter storage wall than when the foreign matter trapping wall is formed flat.

According to the fourth aspect of the invention, compared to the case where the foreign matter retention wall is formed flat, the side wall of the main body of the cleaning member on the side opposite to the central side in the axial direction of the photoreceptor and the foreign matter retention wall form. Foreign matter tends to gather at the corners.

According to the fifth aspect of the invention, compared to the case where the end of the foreign matter trapping wall on the outer peripheral side of the photoreceptor and the end on the inner peripheral side of the photoreceptor are at the same position in the circumferential direction of the photoreceptor, the foreign matter trapping wall is It becomes difficult for foreign matter to scatter over the end portion on the outer peripheral side of the photoreceptor.

According to the sixth aspect of the invention, compared to the case where the end of the foreign matter retaining wall on the outer peripheral side of the photoreceptor and the end on the inner peripheral side of the photoreceptor are at the same position in the circumferential direction of the photoreceptor, the foreign matter retaining wall It becomes difficult for foreign matter to scatter over the end portion on the outer peripheral side of the photoreceptor.

According to the seventh aspect of the present invention, it is possible to prevent foreign matter from being removed from the exposed surface region due to a gap between the main body of the cleaning member and the photosensitive layer of the photoreceptor in the axial direction of the photoreceptor.

1 is a schematic configuration diagram of an image forming apparatus; FIG. 2 is a schematic diagram showing the configuration of a photoreceptor; FIG. FIG. 4 is a diagram for explaining the positional relationship between a photoreceptor and its peripheral members; FIG. 4 is a perspective view of a seal contacting an exposed surface area of a photoreceptor; It is a figure which shows an example of a seal. FIG. 10 is a diagram showing another example of a seal; FIG. 10 is a diagram showing yet another example of a seal; FIG. 10 is a diagram showing yet another example of a seal; FIG. 10 is a diagram showing yet another example of a seal; FIG. 10 is a diagram for explaining the positional relationship between a photoreceptor and a seal in another embodiment;

EMBODIMENT OF THE INVENTION Below, it demonstrates in detail, referring an accompanying drawing for embodiment which concerns on this invention. The configuration described below is an example for explanation, and can be changed as appropriate according to the specifications of the image forming apparatus. The same reference numerals are given to the same elements in all the drawings, and redundant explanations are omitted. In addition, when a plurality of embodiments and modifications are included below, it is assumed from the beginning that the characteristic parts thereof will be used in combination as appropriate.

FIG. 1 is a schematic configuration diagram of an image forming apparatus 10 according to this embodiment. The axial direction, radial direction, and circumferential direction of the photoreceptor 12 are appropriately shown in FIG. 1 and each figure described later. The image forming apparatus 10 is an apparatus that forms an image on a sheet of paper P using an electrophotographic method. The image forming apparatus 10 includes a rotating photoreceptor 12 (also referred to as a photoreceptor drum), a charging roll 40 that charges the surface of the photoreceptor 12, an exposure device 14 that forms a latent image on the surface of the photoreceptor 12, and a photoreceptor. A developing unit 16 for developing an electrostatic latent image on the surface of 12 to obtain a toner image, a primary transfer roll 18 for transferring the toner image on the photosensitive member 12 to an intermediate transfer belt 20, The secondary transfer roll 22 that transfers to the paper P, the seal 50 (also called a cleaning member) in contact with the exposed surface area at the axial end of the photoreceptor 12, and the remaining toner on the photoreceptor layer of the photoreceptor 12 are removed. and a toner cleaning device 28 .

The photoreceptor unit 11 includes the photoreceptor 12, the charging roll 40, the seal 50, the toner cleaning device 28, and a housing (not shown) that supports them. It is detachably attached to the device 10 . The seal 50 seals the gap between the support 36 fixed to the housing of the photoreceptor unit 11 and the photoreceptor 12 .

FIG. 2 is a schematic diagram showing the configuration of the photoreceptor 12. As shown in FIG. The photoreceptor 12 includes a cylindrical or columnar base 80 and cylindrical end members 86 fitted to both ends of the base 80 in the axial direction. In FIG. 2 and FIG. 3, which will be described later, the axial range of the base 80 is indicated by symbol BL. For example, the base 80 is made of metal and the end member 86 is made of resin. A photosensitive layer 82 is provided on the surface of the substrate 80 on the central side in the axial direction, and the photosensitive layer 82 holds an image transferred onto the paper P via the intermediate transfer belt 20 . Surface exposed regions 84 (also referred to as blank tube regions or blank tube portions), which are regions where the photosensitive layer 82 is not provided on the surface of the substrate 80, are provided at both ends of the substrate 80 in the axial direction. In this specification, the surface-exposed region 84 is a region where the photosensitive layer 82 is not provided on the surface of the substrate 80 as described above. A region in which the 80 surface is processed or a film or the like is formed is also included. As described above, the photosensitive layer 82 on the surface of the substrate 80 holds the image to be transferred to the paper P, but the area of the photosensitive layer 82 in the axial direction of the substrate 80 that does not hold the image (the image non-holding area) ) may be provided. In that case, surface exposed areas 84 may be defined as those areas that include non-image bearing areas of photosensitive layer 82 .

Returning to FIG. 1, the charging roll 40 is composed of a conductive rubber roll or the like, is rotatably arranged in contact with the photoreceptor 12, and rotates as the photoreceptor 12 rotates. The charging roll 40 applies a charging voltage to the photoreceptor 12 to charge the photosensitive layer of the photoreceptor 12 .

The exposure device 14 forms an electrostatic latent image by selectively performing optical writing using a laser beam on the photosensitive layer of the photoreceptor 12 charged by the charging roll 40 . As the light source in the exposure device 14, an LED (Light Emitting Diode) light source or the like can be used in addition to the laser light source.

The developing unit 16 includes a developing roller 46 rotatably arranged to face the photoreceptor 12. Inside the developing unit 16, developer containing toner of a predetermined color (for example, black) is accommodated. ing. The developing roll 46 holds developer on its surface and supplies toner to the photosensitive layer of the photoreceptor 12 to develop the electrostatic latent image on the photosensitive layer.

The primary transfer roll 18 is composed of a conductive rubber roll or the like, is rotatably disposed facing the photoreceptor 12 via the intermediate transfer belt 20, and rotates as the intermediate transfer belt 20 moves. The primary transfer roll 18 sandwiches the intermediate transfer belt 20 with the photoreceptor 12 , applies a primary transfer voltage to the photoreceptor 12 and the intermediate transfer belt 20 , and intermediately transfers the toner image on the photosensitive layer of the photoreceptor 12 . Primary transfer is performed on the belt 20 .

The secondary transfer roll 22 is composed of a rubber roll or the like, and is rotatably arranged. Secondary transfer to P. Although not shown, the image forming apparatus 10 includes a fixing device that fixes the toner image that has been secondarily transferred onto the paper P using heat, pressure, or the like.

The seal 50 (cleaning member) is, for example, felt, sponge, or the like, and is supported by the support 36 and is in contact with the exposed surface area of the photoreceptor 12 . Note that the support 36 is fixed to the housing of the photoreceptor unit 11 . Details of the seal 50 will be described later.

The toner cleaning device 28 includes a cleaning blade 32 arranged to abut against the surface of the photosensitive layer of the photoreceptor 12 , a toner cleaning container 30 into which toner removed from the photoreceptor 12 by the cleaning blade 32 enters, and a toner cleaning container 30 . and a transport auger 34 for transporting toner to a waste toner collecting container (not shown). The cleaning blade 32 is made of a rubber material such as urethane rubber.

A brief description of the image forming process of the image forming apparatus 10 is as follows. First, the charging roll 40 uniformly charges the photosensitive layer surface of the rotating photoreceptor 12 . An electrostatic latent image is written on the charged surface of the photosensitive layer by an exposure device 14 such as a laser optical system. The electrostatic latent image on the surface of the photosensitive layer is developed into a toner image by the developing unit 16 . Then, the toner image is primarily transferred onto the intermediate transfer belt 20 . The toner image on the intermediate transfer belt 20 is secondarily transferred onto the paper P conveyed from a paper feed tray (not shown) using the secondary transfer roll 22 . The toner image that has been secondarily transferred onto the paper P is fixed by a fixing device, and then the paper P is discharged outside the image forming apparatus 10 . After the primary transfer, the photoreceptor 12 is cleaned by the toner cleaning device 28 to remove residual toner from the surface of the photosensitive layer of the photoreceptor 12 in preparation for the next image forming process.

Next, the seal 50 will be described in detail. FIG. 3 is a schematic diagram showing the photoreceptor 12 and specific members around it when the photoreceptor 12 is viewed from above. As shown in FIG. 3 , tracking rolls 47 are provided at both ends of the rotating shaft of the developing roll 46 as gap holding members for holding a gap between the developing roll 46 and the photoreceptor 12 . Since the two tracking rolls 47 are in contact with the exposed surface area 84 of the photoreceptor 12, a constant gap is maintained between the photoreceptor 12 and the developing roll 46, thereby maintaining stable development conditions. .

A cleaning blade 32 and two seals 50 are arranged on the opposite side of the developing roll 46 and tracking roll 47 with the photoreceptor 12 interposed therebetween. The cleaning blade 32 is positioned on the axial center side of the photoreceptor 12 , extends in the axial direction of the photoreceptor 12 , and is in contact with the photosensitive layer 82 . The two seals 50 are positioned above the cleaning blade 32 (see FIG. 1) and are in contact with the two exposed surface areas 84 at both ends of the photoreceptor 12 in the axial direction. In this embodiment, the two seals 50 have symmetrical shapes. The two seals 50 may have different shapes according to the specifications of the photosensitive unit.

As shown in FIG. 3, the tracking roll 47 is in contact with the exposed surface area 84 of the photoreceptor 12, so that the exposed surface area 84 is scraped off by the tracking roll 47 rubbing the exposed surface area 84 of the photoreceptor 12. Foreign matter M such as (for example, shavings of metal (aluminum, etc.)) is generated in the surface exposed region 84 . Also, there is a possibility that foreign matter M other than shavings may adhere to the exposed surface region 84 . When such foreign matter M accumulates on the exposed surface region 84 of the photoreceptor 12, particularly on the portion in contact with the tracking roll 47, the gap between the photoreceptor 12 and the developing roll 46 changes, and the developing conditions are changed to produce an image. Negatively affects formation. Therefore, by providing the seal 50 to capture (clean) the foreign matter M in the surface exposed region 84, such a problem is avoided or suppressed.

4 is a perspective view of the seal 50 in contact with the exposed surface area of the photoreceptor 12, and FIG. 5 is a diagram schematically showing the seal 50 viewed from the radial direction of the photoreceptor 12. FIG. As shown in FIG. 4, the seal 50 (cleaning member) includes a substantially rectangular parallelepiped main body 52 extending along the circumferential direction of the photoreceptor 12 and a main body 52 at a position downstream of the main body 52 in the rotational direction of the photoreceptor 12 . and a substantially rectangular parallelepiped stepped portion 54 extending from the photoreceptor 12 to the side opposite to the center side in the axial direction of the photoreceptor 12 . The main body 52 has a bottom 56 in contact with the exposed surface area of the photoreceptor 12, and rises from the upstream end of the bottom 56 in the rotational direction of the photoreceptor 12 to the outer peripheral side of the photoreceptor 12 to catch the foreign matter M on the exposed surface area. It has a foreign object trapping wall 58 . Further, the stepped portion 54 has a foreign matter retaining wall 60 which is arranged below the foreign matter capturing wall 58 of the main body 52 and rises from the inner peripheral side to the outer peripheral side of the photoreceptor 12 to retain the foreign matter M.

As shown in FIG. 3, the bottom of body 52 of seal 50 contacts exposed surface area 84 of photoreceptor 12 and the bottom of stepped portion 54 of seal 50 contacts the surface of end member 86 of photoreceptor 12 . ing. Returning to FIG. 4, the main body 52 of the seal 50 and the bottom of the stepped portion 54 come into a curved shape by coming into contact with the peripheral surface of the photoreceptor 12 . A structure 38, which is part of the housing of the photoreceptor unit, is arranged on the opposite side of the seal 50 from the central side of the photoreceptor 12 in the axial direction. A side surface 39 of the structure 38 extends along the circumferential direction of the photoreceptor 12 from a position higher than the stepped portion 54 of the seal 50 and contacts the side surface of the stepped portion 54 .

Next, the effects of the image forming apparatus 10 of the present embodiment provided with the seal 50 (cleaning member) having the above configuration will be described. First, the foreign matter trapping wall 58 traps the foreign matter M on the exposed surface area of the photoreceptor 12 coming toward itself as the photoreceptor 12 rotates. Then, the foreign matter M captured on the foreign matter capturing wall 58 eventually falls toward the stepped portion 54 and stays on the foreign matter retention wall 60 . Therefore, scattering of the captured foreign matter M around the seal 50 is suppressed or reduced compared to the case where the foreign matter M cannot be removed from the foreign matter trapping wall 58 (dropped onto the foreign matter storage wall 60).

In particular, according to the seal 50 having the above configuration, the fall of the foreign matter M toward the center side of the photoreceptor 12 in the axial direction (broken line arrow in FIG. 4) is suppressed or reduced. A cleaning blade 32 is arranged on the center side in the axial direction of the photoreceptor 12 and below the seal 50 (see FIGS. 1 and 3). When the foreign matter M falls from the seal 50 toward the cleaning blade 32 located in the center of the photosensitive member 12 in the axial direction, the foreign matter M enters between the surface of the photosensitive layer and the cleaning blade 32, damaging the cleaning blade 32. There is fear. If the cleaning blade 32 is damaged, it will not be possible to sufficiently remove residual toner on the photosensitive layer. Further, even if the cleaning blade 32 is not damaged, the falling of the foreign matter M toward the center of the photoreceptor in the axial direction may cause problems such as contamination of the surface of the photoreceptor. However, according to the seal 50 having the above configuration, the falling of the photoreceptor 12 toward the center in the axial direction is suppressed or reduced, so the occurrence of the above problems can be suppressed.

In the image forming apparatus 10 of the present embodiment, the seals 50 are provided at both ends in the axial direction of the photoreceptor 12, but the seals 50 may be provided only at one end. The bottom 56 of the main body 52 of the seal 50 may be in contact with the peripheral surface of the photoreceptor 12 as a whole, or may extend from the upstream end of the photoreceptor 12 in the rotation direction of the bottom 56 of the main body 52 toward the downstream side. Only the partial area may be in contact with the peripheral surface of the photoreceptor 12 . Similarly, the bottom of the stepped portion 54 of the seal 50 may be wholly in contact with the peripheral surface of the photoreceptor 12 , or may extend from the upstream end of the bottom of the stepped portion 54 in the rotational direction of the photoreceptor 12 toward the downstream side. Only part of the area may be in contact with the peripheral surface of the photoreceptor 12 .

Next, a modified example of the seal 50 will be described. FIG. 6 is a diagram schematically showing another seal 50 viewed from the radial direction of the photoreceptor 12. As shown in FIG. A seal 50 (cleaning member) shown in FIG. 62 included. According to this configuration, the foreign matter M can be easily guided from the foreign matter trapping wall 58 to the foreign matter storage wall 60 .

FIG. 7 is a diagram schematically showing yet another seal 50. As shown in FIG. In the seal 50 shown in FIG. 7, the foreign object capturing wall 58 is inclined downward toward the foreign object retention wall 60 . According to this configuration, compared to the case where the foreign matter trapping wall 58 is formed flat, the foreign matter M falls from the foreign matter trapping wall 58 to the foreign matter storage wall 60 more easily, and the foreign matter M falls toward the center of the photoreceptor 12 in the axial direction. It is possible to effectively suppress the fall to.

FIG. 8 is a diagram schematically showing yet another seal 50. As shown in FIG. In the seal 50 shown in FIG. 8, the foreign matter retaining wall 60 is inclined downward toward the foreign matter trapping wall 58 . According to this configuration, the corner formed by the side wall 64 of the main body 52 opposite to the central side of the photoreceptor 12 in the axial direction and the foreign matter retention wall 60 is formed as compared with the case where the foreign matter retention wall 60 is formed flat. Since the foreign matter M is likely to gather in the area, the scattering of the foreign matter M is effectively suppressed.

FIG. 9 is a diagram schematically showing yet another seal 50. As shown in FIG. In the seal 50 shown in FIG. 9, the end of the foreign matter trapping wall 58 on the outer peripheral side of the photoreceptor protrudes upstream in the rotational direction of the photoreceptor 12 compared to the end on the inner peripheral side of the photoreceptor. According to this configuration, compared to the case where the end portion of the foreign matter capturing wall 58 on the outer peripheral side of the photoreceptor and the end portion on the inner peripheral side of the photoreceptor are at the same position in the circumferential direction of the photoreceptor 12, the foreign matter capturing wall 58 is exposed to light. It becomes difficult for the foreign matter M to scatter beyond the end on the outer peripheral side of the body. Note that this configuration can also be applied to the foreign object retention wall 60 . That is, the end portion of the foreign matter holding wall 60 on the outer peripheral side of the photoreceptor is projected upstream in the rotation direction of the photoreceptor 12 compared to the end portion on the inner peripheral side of the photoreceptor. As a result, the foreign matter M is less likely to scatter beyond the edge of the foreign matter storage wall 60 on the outer peripheral side of the photoreceptor.

Further, in the seal 50 of the embodiment described above, the main body 52 was not in contact with the photosensitive layer 82 as shown in FIG. However, as shown in FIG. 10, a portion of the body 52 of the seal 50 overlaps a portion of the photosensitive layer 82 of the photoreceptor 12 in the axial direction of the photoreceptor 12 so that the body 52 and the photosensitive layer 82 overlap each other. You may make it touch. In FIG. 10, the area where the body 52 of the seal 50 and the photosensitive layer 82 overlap is indicated by the symbol OL. According to this configuration, it is possible to prevent the formation of a gap between the main body 52 of the seal 50 and the photosensitive layer 82 of the photoreceptor 12 in the axial direction of the photoreceptor 12. Cleaning failure can be prevented.

If the foreign matter M contains metal powder and the developing roller 46 has a magnetic force, the foreign matter M is easily attracted to the developing roller 46 by the magnetic force of the developing roller 46 and easily taken into the developing unit 16 . Therefore, in the case where the foreign matter M contains metal powder and the developing roll 46 has a magnetic force, the trapping position and retention position of the foreign matter M of the seal 50 are the positions on the opposite side of the developing roll 46 with the photoreceptor 12 interposed therebetween. is preferred.

Various embodiments have been described above, and these can be combined as appropriate. The combined embodiment produces a synergistic effect and more effectively suppresses the scattering of foreign matter M around the seal 50 .

10 image forming apparatus 11 photoreceptor unit 12 photoreceptor 14 exposure device 16 development unit 18 primary transfer roll 20 intermediate transfer belt 22 secondary transfer roll 24 opposing roll 28 toner cleaning device 30 toner cleaning container, 32 cleaning blade, 34 transport auger, 36 support, 38 structure (part of housing), 39 side surface, 40 charging roll, 46 developing roll, 47 tracking roll, 50 seal (cleaning member), 52 main body, 54 Stepped portion 56 Bottom 58 Foreign matter capturing wall 60 Foreign matter retaining wall 62 Foreign matter guide wall 64 Side wall 80 Substrate 82 Photosensitive layer 84 Surface exposed region 86 Edge member M Foreign matter P Paper.

Claims (7)

Rotation having a cylindrical or columnar substrate, a photosensitive layer provided on the surface of the substrate on the central side in the axial direction, and a surface exposed region of the substrate provided on at least one of the ends in the axial direction of the substrate a possible photoreceptor;
a cleaning member that cleans the surface exposed area;
The cleaning member is
A main body extending along the circumferential direction of the photoreceptor, comprising: a bottom contacting the surface-exposed region; a body having a foreign object trapping wall for trapping foreign objects on the exposed area;
A stepped portion extending from the main body to the side opposite to the central side in the axial direction of the photoreceptor at a position on the downstream side of the main body in the rotation direction of the photoreceptor, the step being lower than the foreign matter capturing wall of the main body. and a stepped portion having a foreign matter retaining wall that rises from the inner peripheral side to the outer peripheral side of the photoreceptor and stores the foreign matter,
Image forming device. The image forming apparatus according to claim 1,
the main body of the cleaning member includes a foreign object guiding wall extending obliquely downward from the foreign object trapping wall toward the foreign object retention wall and guiding the foreign matter from the foreign object acquisition wall to the foreign object retention wall;
Image forming device. 3. The image forming apparatus according to claim 1,
The foreign object capturing wall of the cleaning member is inclined downward toward the foreign object retaining wall,
Image forming device. The image forming apparatus according to any one of claims 1 to 3,
the foreign matter retaining wall of the cleaning member is inclined downward toward the foreign matter capturing wall,
Image forming device. The image forming apparatus according to any one of claims 1 to 4,
an end portion of the foreign matter trapping wall on the outer periphery side of the photoreceptor protrudes upstream in the rotation direction of the photoreceptor compared to an end portion on the inner periphery side of the photoreceptor;
Image forming device. The image forming apparatus according to any one of claims 1 to 5,
an end portion of the foreign matter retaining wall on the outer peripheral side of the photoreceptor protrudes upstream in the rotation direction of the photoreceptor compared to an end portion on the inner peripheral side of the photoreceptor;
Image forming device. The image forming apparatus according to any one of claims 1 to 6,
a portion of the main body of the cleaning member and a portion of the photosensitive layer of the photoreceptor overlap in the axial direction of the photoreceptor;
Image forming device.

Images