JPH0743989A - Image forming device and cleaning device for electrostatic charging roller - Google Patents

Abstract

PURPOSE:To evade such a state that the large amount of toner or paper powder is attached on a contact type electrostatic charge member (electrostatic charging roller) and to stabilize imaging quality. CONSTITUTION:The electrostatic charging roller 102 electrostatically charging a photoreceptor drum 101, an electrostatic charging roller attachment and detachment part 206 executing the attaching and detaching action of the roller 102 with respect to the drum 101, a unit detection part 203 detecting whether a cleaning unit 106 cleaning the surface of the drum 101 is loaded or unloaded and a CPU 201 controlling the attachment and detachment part 206 and making the roller 102 abut on the drum 101 after the drum 101 is rotated in a fixed time based on the detected result of the detection part 203 when the unit 106 is loaded again are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus which is used in a copying machine, a laser printer or the like, and which has a contact charging means (charging roller) capable of coming into contact with and separating from a photoconductor. To prevent toner and the like accumulated between the body and the photoconductor cleaning device from adhering to the contact charging device,
Alternatively, the present invention relates to an image forming apparatus that removes toner and the like attached to the charging member and a cleaning device for the charging roller.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus using an electrophotographic method represented by the Carlson process, a corona discharge method which is a non-contact charging method is often used in order to uniformly charge the surface of a photoconductor. Is coming. In this corona discharge method, a high voltage is applied to a tungsten wire of about 30 to 100 μm called a corona wire for discharging. Therefore, it is known that the air around the corona wire is ionized and a large amount of undesirable gas such as ozone and nitric oxide is generated in the surroundings.

At high concentrations, ozone and the like are harmful to the human body as well as to the characteristics of the photoconductor and mechanical parts. Further, in recent years, the photoconductor has become an organic photoconductor for negative charging due to the improvement of image quality and the like. However, in the conventional corona discharge method, ozone gas is generated when negative discharge is performed. However, it becomes particularly noticeable. Furthermore, recently, the ozone concentration discharged to the outside of the machine has been more severely regulated by safety standards, but there is a limit to the reduction of the ozone generation amount during the charging process in the corona discharge method.

On the other hand, in contrast to the corona discharge method, there is known a contact type charging method in which a charging member (charging roller) is brought into contact with the surface of a photosensitive member to carry out a charging process. This contact charging method has the advantages that the voltage applied to the charging member is small and the amount of ozone generated is very small. However, this contact type charging system has a drawback that it is inferior to the conventional corona discharge in terms of uniformity of charging.

In order to improve such uniformity of charging in the contact type charging system, charging is performed by superposing an AC voltage having a peak-to-peak voltage which is more than twice the charging start voltage when a DC voltage is applied to the charging member. Has been proposed (Japanese Patent Laid-Open No. 63-149668).
However, this method has problems that the voltage application power source becomes large, high-frequency sound is generated by the application of alternating current, and ozone is increased because the voltage cannot be effectively used. there were. Therefore, in the past, it has been considered to carry out uniform charging only with a DC voltage without using an AC voltage.

In addition, as a reference technical document related to the present invention, a device of a charging roller type, which is configured to bring the charging roller into contact with and separate from the surface of the photosensitive member, is disclosed in "Image forming device" of Japanese Patent Laid-Open No. 3-48870. Has been done. An apparatus for cleaning the surface of the charging roller is disclosed in Japanese Patent Laid-Open No. 3-1006.
No. 76, “Charging Device”.

[0007]

However, in the above-mentioned conventional technique, the material properties of the charging member are naturally limited, and if a material having good material uniformity is obtained. Even if the charging member is always in contact with the photoconductor, foreign matter such as toner or paper dust generated from the recording paper adheres to the charging member, causing a partial change in resistance at the adhesion portion. , Causing uneven charging,
There is a problem that the charging cannot be made uniform.

Further, the process of adhering toner and paper powder to the above-mentioned charging member will be described in detail with reference to the drawings. 7A and 7B are explanatory views showing the state of the toner staying on the front edge portion of the photoconductor and the cleaning blade, 101 is a photoconductor drum for executing various image forming processes, 107 is the stagnant toner on the surface of the photoconductor drum 101. A cleaning blade 301 for removing the like is stagnant toner.

The cleaning unit is the photosensitive drum 10.
1 when the photoconductor drum 101 is removed and reattached, or when the cleaning blade 107 is moved toward and away from the photoconductor drum 101, the accumulated toner accumulated on the leading edge of the cleaning blade 107 while the photoconductor drum 101 is being driven. 301 (X part in FIG. 7A) moves to the downstream side (Y part in FIG. 7A). This is shown in Fig. 7 (b).
As shown in FIG. 7, the contact position of the cleaning blade 107, that is, the position after the photosensitive drum 101 is driven and the re-contact position after the separation are different from each other. Therefore, when the image forming process is executed in this state, the toner enters the contact charging member (charging roller), the streaky toner 301 adheres to the contact charging member, and the potential of the adhered portion is uneven. And appear as white lines on the image.

That is, the accumulated toner between the photosensitive drum and the cleaning blade moves from the tip edge portion of the cleaning blade to the contact charging member side when the cleaning unit is put in and out and is re-contacted after the cleaning blade is separated. As a result, the contact charging member is contaminated with stagnant toner, deteriorating the charging characteristics and degrading the image quality.

Further, in the conventional charging device for cleaning the surface of the charging roller, since the tip of the cleaning member (eg, brush) is flat without any curvature, the amount of bite (overlap amount) with respect to the charging roller is increased. However, there is a problem that the foreign matter is not removed sufficiently and the foreign matter is not removed sufficiently.

The present invention has been made in view of the above, and it is a first object of the present invention to avoid the adhesion of a large amount of toner, paper dust, etc. to the contact charging member and to stabilize the image quality. .

Further, even if the contact charging member (charging roller) is contaminated, the surface of the image can be stabilized efficiently and effectively to stabilize the image quality.
The purpose of.

[0014]

In order to achieve the above object, the present invention provides a contact charging means for charging a photosensitive member and a contact / separation operation for contacting / separating the contact charging means with respect to the photosensitive member. An image forming apparatus having means for detecting the attachment / detachment of the cleaning means for cleaning the surface of the photoconductor, and based on the detection result of the detection means, rotating the photoconductor for a predetermined time when the cleaning device is reattached. After that, the image forming apparatus is provided with a control unit that controls the contacting / separating unit to bring the contact charging unit into contact with the photoconductor.

Further, a contact charging means for charging the photosensitive member, a contacting / separating means for contacting / separating the contacting charging means with respect to the photosensitive member, and a structure capable of contacting / separating operation with respect to the photosensitive member are used. An image forming apparatus having a cleaning blade for cleaning the cleaning blade, the detection means for detecting the contact / separation state of the cleaning blade with respect to the photoconductor, and the re-contact of the cleaning blade with the photoconductor based on the detection result by the detection means. The present invention provides an image forming apparatus comprising: a control unit that controls the contacting / separating unit to bring the contact charging unit into contact with the photoconductor after the photoconductor is rotated for a certain period of time.

Also, the control means controls the contact / separation means to bring the contact charging means into contact with the photoconductor after the photoconductor is reversely rotated for a predetermined time based on the detection result of the detection means. Is.

Further, in a charging roller cleaning device which abuts on the surface of a charging roller for charging a photosensitive member and rubs the surface by the rotation of the charging roller, a portion contacting the charging roller is The present invention provides a cleaning device for a charging roller, which has a shape having substantially the same curvature as the charging roller.

Further, in a charging roller cleaning device that abuts on the surface of a charging roller for charging a photosensitive member and rubs the surface by the rotation of the charging roller, the curvature of the charging roller is almost the same as that of the charging roller. A cleaning device for a charging roller having a base member having a curved portion and a cleaning member having the same length fixed to the base member.

Further, in a charging roller cleaning device which abuts on the surface of a charging roller for charging a photosensitive member and rubs the surface by the rotation of the charging roller, in a longitudinal direction along the charging roller. (EN) A charging roller cleaning device comprising a mounting member having an opening portion at its inner end, and a cleaning member fitted into the opening portion of the mounting member so as to bring a tip end portion into contact with the charging roller.

[0020]

In the image forming apparatus according to the present invention, the detecting means detects the detaching operation of the cleaning unit from the photoconductor, and when the cleaning unit is reattached, the control means rotates the photoconductor for a predetermined time. After that, the contact charging means (charging roller) is controlled at the timing of contacting the photoconductor to prevent toner and the like accumulated between the cleaning unit and the photoconductor from adhering to the contact charging means.

Further, the control means detects the re-contact after the cleaning blade is separated from the photoconductor by the detection means, rotates the photoconductor for a predetermined time at the time of the re-contact, and then causes the contact charging means to move the photoconductor to the photoconductor. Control at the timing of contact with
Toner or the like staying between the cleaning unit and the photoconductor is prevented from adhering to the contact charging means.

Further, the control means rotates the photosensitive member in the reverse direction for a certain period of time when the cleaning blade is separated from the photosensitive member or when the cleaning unit is detached and reattached. The toner and the like staying between the cleaning unit and the photoconductor are returned to the cleaning unit side by controlling at the timing of contact with the cleaning unit and the photoconductor. Do not attach to contact charging means.

Further, in the charging roller cleaning device according to the present invention, the tip shape of the brush material is made to have substantially the same curvature as the curvature of the charging roller, and the tip portion is brought into contact with the charging roller to rotate the charging roller. As a result, the deposits on the charging roller can be removed efficiently and effectively.

Further, the brush member is fixed to the brush having the same length along the base member having the concave portion having substantially the same curvature as the curvature of the charging roller, and the tip portion is formed to have substantially the same curvature as the curvature of the charging roller. By contacting the charging roller and rotating the charging roller, the adhered matter on the charging roller can be efficiently and
And effectively remove it.

Further, the sponge material is fitted into the opening portion of the mounting member having an opening portion in the longitudinal direction along the charging roller, the tip end portion of the sponge material is brought into contact with the charging roller, and the charging roller is rotated. , Efficiently and effectively removes the deposits on the charging roller.

[0026]

Embodiments of an image forming apparatus and a charging roller cleaning apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of an image forming system of an image forming apparatus to which the present invention is applied. In the figure, 10
Reference numeral 1 is a photosensitive drum that forms an electrostatic latent image, and a drive system (not shown) is configured to be rotatable in the forward and reverse directions. Also, 1
02 is configured to be capable of contacting and separating in parallel to the surface of the photosensitive drum 101, and contacting the photosensitive drum 101,
A charging roller for charging the surface thereof.

Further, 103 is an image light such as a reading light obtained by optically reading an original (not shown) or a laser light according to an image signal, 104 is a toner containing toner, and a developing process is executed based on a developing process. A developing device 105, a transfer belt 105 for transferring an image formed on the photosensitive drum 101 to a storage sheet, a cleaning unit 106 for removing residual toner, paper dust and the like on the photosensitive drum 101 after the transfer processing. Mainly comprises the cleaning unit 106,
A rubber plate-shaped cleaning blade whose front edge portion contacts the photosensitive drum 101.

Next, the operation will be described. The surface of the photoconductor drum 101 is uniformly charged to a high potential by the charging roller 102 that is in contact with the photoconductor drum 101. When the image light 103 is irradiated onto the surface of the photoconductor drum 101 after the charging process, the potential of the irradiated portion decreases. Since the image light 103 has a light amount distribution corresponding to black / white of the image, the potential distribution corresponding to the recorded image, that is, an electrostatic latent image is formed on the surface of the photosensitive drum 101 by the irradiation of the image light 103. .

The portion on which the electrostatic latent image is formed is the developing device 1.
After passing 04, toner adheres according to the level of the potential, and a toner image is formed by visualizing the electrostatic latent image.
The recording paper is conveyed by a registration roller (not shown) to the portion where the toner image is formed at a predetermined timing, and the recording paper is superposed on the toner image. After the toner image is transferred onto the recording paper by the transfer belt 105, the recording paper is separated from the photosensitive drum 101. The separated recording paper is conveyed through a conveyance path, is thermally fixed by a heat roller and a pressure roller having a heater of a fixing unit (not shown), and is then ejected to the outside of the machine. Further, after the transfer process is completed, the surface of the photosensitive drum 101 is cleaned by the cleaning blade 107 of the cleaning unit 106, and is put in a standby state in preparation for the next image forming process.

FIG. 2 is a block diagram showing the configuration of the control system in the image forming apparatus according to the present invention.
Reference numeral 201 denotes a central processing unit (hereinafter referred to as CPU) that executes various controls based on a control program, and 202 denotes a contact / separation operation of the cleaning blade 107 with respect to the surface of the photosensitive drum 101 based on a control signal from the CPU 201. Cleaning blade contact / separation unit having a mechanism, 203
Is a unit detection unit that detects the set state of the cleaning unit 106 due to attachment / detachment.

Reference numeral 204 designates a photoconductor driving device which drives the photoconductor drum 101 to rotate in the image forming direction (clockwise) and counterclockwise, and 205 designates the photoconductor driving device 204 based on a control signal from the CPU 201. It is a drive control unit for controlling. Reference numeral 206 denotes a charging roller contact / separation unit having a contact / separation operation mechanism for the charging roller 102 with respect to the surface of the photosensitive drum 101 based on a control signal from the CPU 201.
Reference numeral 207 denotes a voltage application power source that applies a charging voltage to the charging roller 102 based on a control signal from the CPU 201.

Next, the operation will be described. FIG. 3 shows the charging roller 102 and the cleaning blade 1 according to the present invention.
FIG. 7 is an explanatory diagram showing the contact / separation timing of 07 and the rotation control of the photosensitive drum 101. In the figure, reference numeral 301 denotes stagnant toner that stagnates between the photosensitive drum 101 and the leading edge portion of the cleaning blade 107 after a series of image forming processes. Hereinafter, the first embodiment and the second embodiment will be described separately.

[Embodiment 1] FIG. 3A shows the state of the photosensitive drum 101, the charging roller 102, and the cleaning blade 107 immediately after the image forming process is completed.
That is, immediately after this image forming process, the charging roller 10
2 and the cleaning blade 107 are in contact with the photosensitive drum 101. Then, from the state immediately after the completion of the image forming process, as shown in FIG. 3B, the charging roller 102 is separated from the surface of the photosensitive drum 101 by the charging roller contact / separation unit 206. Next, the cleaning blade 107 is attached to the cleaning blade contacting / separating portion 2
ON / OFF (separation / contact) by 02, or the cleaning unit 106 is removed from the main body and reattached. This state is shown in FIGS. 3 (c) and 3 (d).

At this time, after the cleaning blade 107 is turned on / off (separated / contacted) or the cleaning unit 106 is reattached, the residual toner 301 accumulated on the leading edge portion of the cleaning blade 107 on the photosensitive drum 101 is removed. The position moves from the upstream position X of the cleaning blade 107 to the downstream position Y. That is, as shown in FIG. 7 of the conventional example, the movement of the position of the staying toner 301 is caused by the leading edge of the cleaning blade 107 (photosensitive drum 101) immediately after the image formation is completed.
The tip of the photoconductor drum 101 is bent in the rotational direction due to friction with and is slightly deformed) and when the photoconductor drum 101 is re-contacted or reattached (the tip edge portion returns to the initial state).
Occurs due to the shape change of the tip edge at the contact position with respect to.

Next, in the above, the CPU 201 determines whether the cleaning blade 107 is turned on or off, or the cleaning unit 106 is attached or detached.
3, and outputs a rotation signal to the drive control unit 205. The drive control unit 205 drives the photoconductor driving device 204, and the photoconductor drum 101 is slightly rotated from the state of FIG. 3D to the state of FIG. As a result, the position of the staying toner 301 moves from Y to Y ′ which has passed the contact portion of the charging roller 102. By restarting the image forming process in this state, the charging roller 102 is brought into contact with the photosensitive drum 101 as shown in FIG.

As described in the above embodiment, while the charging roller 102 is separated from the surface of the photosensitive drum 101, the staying toner 301 at the tip edge portion of the cleaning blade 107 is moved to the downstream of the charging roller 102. As a result, the charging roller 102 is prevented from being contaminated by the toner, so that stable charging characteristics can be obtained and the image quality can be stabilized.

[Second Embodiment] Similar to the first embodiment,
When the series of image forming processes is completed, the process shown in FIG.
As shown in (b), the charging roller 102 is separated from the surface of the photosensitive drum 101 by the operation of the charging roller contact / separation unit 206. Next, the cleaning blade 107 is separated from the photosensitive drum 101 by the cleaning blade contacting / separating portion 202, or the cleaning unit 106 is used.
3 is removed from the main body, the state shown in FIG.

Next, in the above, the CPU 201 turns ON / OFF the cleaning blade 107 or removes / attaches the cleaning unit 106 from the unit detector 20.
3 and outputs a reverse rotation signal to the drive control unit 205. The drive control unit 205 includes the photoconductor drive device 20.
4 is driven, the photosensitive drum 101 is slightly rotated counterclockwise from the state of FIG. 3C to the state of FIG.
As a result, the position of the staying toner 301 moves from X to X ′ that has passed the contact portion of the charging roller 102. Then, the cleaning blade 107 is connected to the photosensitive drum 10.
1, or the cruising unit 106 is set on the main body, and the state shown in FIG. After that, when the image forming process is restarted in this state, the charging roller 102 comes into contact with the photosensitive drum 101 as shown in FIG. As a result, the accumulated toner 301 in the X ′ portion is
It is scraped off by the cleaning blade 107.

As described in the above embodiment, while the charging roller 102 is separated from the surface of the photosensitive drum 101, the accumulated toner 301 accumulated on the tip edge portion of the cleaning blade 107 is discharged upstream of the cleaning blade 107. Since the charging roller 102 is prevented from being contaminated by the toner by moving it to, stable charging characteristics can be obtained and the image quality can be stabilized.

[Third Embodiment] FIG. 4 is an explanatory view showing a schematic structure of a cleaning mechanism for the charging roller 102 according to the present invention. In the figure, reference numeral 401 denotes a shield member for shielding the charging roller 102, so that the cross-sectional shape is substantially U-shaped and covers the charging roller 102 in the longitudinal direction. Further, reference numeral 402 is a brush member fixed to the wall surface of the shield member 401 and having the other shape having a curvature substantially the same as the curvature of the charging roller 102 and brought into contact with the charging roller 102.

As shown in FIG. 4, the surface of the charging roller 102 is brought into contact with the brush member 402 having a tip portion having substantially the same curvature as the charging roller 102, and the charging roller 102 is rotated to adhere to the surface of the charging roller 102. Remove foreign matter such as toner and paper dust. At this time, the brush member 402 is
Since the brush has almost the same curvature as the charging roller 102, the amount of bite (overlap amount) of the brush tip with respect to the charging roller 102 becomes uniform, and the cleaning area is widened for a brush having a flat tip, and an efficient cleaning effect is obtained. Obtainable.

[Embodiment 4] FIG. 5 is an explanatory view showing another schematic structure of the cleaning mechanism of the charging roller 102 according to the present invention. In the figure, 501 is a mounting member having a curved surface that matches the curvature of the charging roller 102, and 502 is a part of the mounting member 501 which is formed by flocking or adhering a thread of a certain length along the curved surface of the mounting member 501 so that the tip of the mounting roller 501 is almost the same as the charging roller 102. The brush is formed so as to have the same curvature, and is attached to the inner wall of the shield member 401 as the brush member 503 so that the tip portion of the brush 502 comes into uniform contact with the charging roller 102.

As shown in FIG. 5, a mounting member 501 having substantially the same curvature as the charging roller 102 is formed on the surface of the charging roller 102.
A brush 502 is provided along the curved surface of the charging roller 102, and the brush 502 is brought into contact with the charging roller 102 to rotate the charging roller 102 to remove foreign matters such as toner and paper dust attached to the surface of the charging roller 102. At this time, since the tip of the brush member 503 has substantially the same curvature as the charging roller 102 and the same bristle leg, the contact pressure on the charging roller 102 is uniform, so that the brush has a flat tip. On the other hand, the cleaning area is expanded, and an efficient cleaning effect can be obtained.

[Embodiment 5] FIG. 6 is an explanatory view showing another schematic structure of the cleaning mechanism of the charging roller 102 according to the present invention. In the figure, 601 is a shield member in which an opening portion is provided in the longitudinal direction on the wall surface of the shield member 401 shown in the third and fourth embodiments, and 602 is a porous rubber (sponge), which is provided on the opening portion of the shield member 601. It is a sponge material having a convex cross section so that it can be fitted therein, and pushing it in from the outside of the opening, and adhering the stepped portion A to the wall surface of the shield member 601.

The sponge material 602 is applied to the shield member 60.
It is assembled by fitting it in the opening portion provided in No. 1 and bringing the tip end portion into contact with the charging roller 102 and adhering the step portion A as described above. In this state, the charging roller 10
2 is rotated to remove foreign matter such as toner and paper dust attached to the surface of the charging roller 102. In particular, since the structure of fitting and adhesion is adopted, the sponge material 602 is hardly peeled off, and stable cleaning performance of the charging roller 102 can be realized for a long time.

[0046]

As described above, according to the image forming apparatus of the present invention, the detecting unit detects the detaching / attaching operation of the cleaning unit from the photoconductor, and controls when the cleaning unit is reattached. The means controls the contact charging means (charging roller) at the timing at which the contact charging means (charging roller) is brought into contact with the photosensitive member after the photosensitive member is rotated for a certain period of time, so that the toner and the like accumulated between the cleaning unit and the photosensitive member come into contact with each other. In order to prevent the cleaning blade from adhering to the charging means, the control means detects the re-contact after the cleaning blade is separated from the photoconductor by the detection means, and after rotating the photoconductor for a certain time during the re-contact. , The contact charging means is controlled at the timing of contact with the photoconductor to prevent toner and the like accumulated between the cleaning unit and the photoconductor from adhering to the contact charging means. Because, furthermore, the control means, when the cleaning blade is separated from the photosensitive member, or cleaning unit is removed, when remounted,
After the photoconductor is rotated in the reverse direction for a certain period of time, the contact charging means is controlled at the timing of contacting the photoconductor, and the toner and the like accumulated between the cleaning unit and the photoconductor are returned to the cleaning unit side. , To prevent the toner and the like accumulated between the cleaning unit and the photoconductor from adhering to the contact charging means, avoiding a large amount of toner or paper dust adhering to the contact charging member and stabilizing the image quality. Can be achieved.

As described above, in the charging roller cleaning device according to the present invention, the tip shape of the brush material is made substantially the same as the curvature of the charging roller, and the tip portion is brought into contact with the charging roller. , In order to remove the deposits on the charging roller efficiently and effectively by rotating the charging roller, the brush member is arranged along a base member having a concave portion having substantially the same curvature as the curvature of the charging roller. A brush having the same length as that of the charging roller, the tip of the charging roller is formed to have a curvature substantially the same as that of the charging roller, and the charging roller is rotated. Further, the sponge material is fitted into the opening portion of the mounting member having an opening portion in the longitudinal direction along the charging roller, and the tip portion of the sponge material is brought into contact with the charging roller, By rotating to remove the deposits on the charging roller, even if the charging roller becomes dirty, the surface of the charging roller can be cleaned efficiently and effectively to stabilize the image quality. You can

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of an image forming system in an image forming apparatus to which the present invention is applied.

FIG. 2 is a block diagram showing a configuration of a control system in the image forming apparatus according to the present invention.

FIG. 3 is an explanatory diagram showing a contact / separation timing of a charging roller and a cleaning blade and rotation control of a photosensitive drum according to the present invention.

FIG. 4 is an explanatory diagram showing a schematic configuration of a cleaning mechanism in the charging roller according to the present invention.

FIG. 5 is an explanatory diagram showing another schematic configuration of the cleaning mechanism in the charging roller according to the present invention.

FIG. 6 is an explanatory diagram showing another schematic configuration of the cleaning mechanism in the charging roller according to the present invention.

FIG. 7 is an explanatory diagram showing a state of toner accumulated on a front edge portion of a photoconductor and a cleaning blade.

[Explanation of symbols]

Reference Signs List 101 Photoconductor drum 102 Charging roller 106 Cleaning unit 107 Cleaning blade 201 CPU 202 Cleaning blade contact / separation unit 203 Unit detection unit 204 Photoconductor driving device 206 Charging roller contact / separation unit 301 Remaining toner 402 Brush member 501 Mounting member 502 Brush 503 Brush member 601 Shield member 602 Sponge material

Claims (6)

[Claims] 1. An image forming apparatus having a contact charging means for charging a photoreceptor and a contacting / separating means for contacting / separating the contact charging means with respect to the photoreceptor, and a cleaning means for cleaning the surface of the photoreceptor. Based on the detection means for detecting the attachment and detachment of the
When the cleaning device is reattached, the photosensitive member is rotated for a certain period of time, and then the contacting / separating unit is controlled to bring the contact charging unit into contact with the photosensitive member. apparatus. 2. A surface of a photoreceptor having a contact charging means for charging the photoreceptor, a contacting / separating means for contacting / separating the contact charging means with respect to the photoreceptor, and a contacting / separating operation for the photoreceptor. An image forming apparatus having a cleaning blade for cleaning the cleaning blade, the detection means for detecting the contact / separation state of the cleaning blade with respect to the photoconductor, and the re-contact of the cleaning blade with the photoconductor based on the detection result by the detection means. An image forming apparatus comprising: a control unit that controls the contacting / separating unit to bring the contact charging unit into contact with the photoconductor after the photoconductor is rotated for a predetermined time. 3. The control means controls the contact / separation means to bring the contact charging means into contact with the photoconductor, after reversely rotating the photoconductor for a predetermined time based on the detection result of the detection means. The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. 4. A charging roller cleaning device that abuts on a surface of a charging roller that performs a charging process on a photosensitive member and rubs the surface by rotating the charging roller,
A charging roller cleaning device, wherein a portion in contact with the charging roller has a shape having substantially the same curvature as that of the charging roller. 5. A cleaning device for a charging roller, which abuts on the surface of a charging roller for charging a photosensitive member and rubs the surface by the rotation of the charging roller.
A charging roller cleaning device comprising: a base member having a portion having substantially the same curvature as that of the charging roller; and a cleaning member having the same length fixed to the base member. 6. A charging roller cleaning device, which abuts on a surface of a charging roller for charging a photosensitive member and rubs the surface by rotating the charging roller,
A cleaning device for a charging roller, comprising: a mounting member having an opening portion in a longitudinal direction along the charging roller; and a cleaning member fitted into the opening portion of the mounting member and contacting a tip end portion with the charging roller.