JP2000075768A - Process cartridge, image forming apparatus and charger - Google Patents

Abstract

(57) Abstract: In a process cartridge including at least a photosensitive drum and a charging roller, the charging roller can stably maintain the charging performance for a long period of time. A moving member provided with a cleaning brush is provided above a charging roller. The moving member 72 is constantly urged to the other end by a reciprocating return spring 74 attached to one end thereof.
A reciprocating lever 73 which is always in contact with the cylindrical cam 76 is attached. By the action of the cylindrical cam 76, the moving member 72 reciprocates in the longitudinal direction of the charging roller 17, and at the same time, the cleaning brush 71 also reciprocates constantly.
As a result, it is possible to prevent fine particles generated during charging, toner floating in the apparatus, and dust from adhering to the surface of the charging roller 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic or electrostatic recording type image forming apparatus such as a printer or a copying machine, a process cartridge detachably mounted on the image forming apparatus, and The present invention relates to a charger used for the image forming apparatus or the process cartridge.

[0002]

2. Description of the Related Art In an image forming apparatus such as a printer, a latent image is formed by selectively exposing an electrophotographic photosensitive member uniformly charged by a charger to a latent image. The toner image is visualized with a toner, and the toner image is transferred to a recording medium to record an image. Then, the developer remaining on the electrophotographic photosensitive member after the transfer is removed by a cleaning blade, and the removed developer is stored in a removed developer container, and the next development is performed by the electrophotographic photosensitive member having the cleaned surface. Like that.

In recent years, the electrophotographic photosensitive member, the charger, the developing device, the cleaning blade, the removed developer container, and the like have been integrated into a process cartridge so that the user can load the cartridge into the apparatus body. As a result, the developing device and the electrophotographic photosensitive member can be replaced with each other to facilitate maintenance and have been put to practical use.

Further, when the life of the electrophotographic photosensitive member is extended and the number of printable sheets is increased, a unit in which a developing device having a limited supply capacity is provided independently, an electrophotographic photosensitive member, a charger, and a cleaning blade in an image forming process are used. The cleaning unit is divided into a drum cartridge and an integrated cleaning unit, which makes it easy to install and maintain the main body of the apparatus as in the case of the above process cartridge, and is used according to the life of the main parts. It is becoming.

[0005]

As described above, when the life of the electrophotographic photosensitive member is prolonged, the cleaning blade and the charger, which are the components of the drum cartridge, also exhibit performance during the period corresponding to the life of the electrophotographic photosensitive member. Need to be maintained.

However, since the charging roller used as the charging device is rotated while being in contact with the photosensitive drum as the electrophotographic photosensitive member, dust and dirt are deposited on the roller surface with long-term use.
In some cases, fine particles such as floating toner and charge products adhere to the roller surface, causing a significant voltage drop point on the roller surface, resulting in poor charging.

Accordingly, a main object of the present invention is to provide a process cartridge including at least an electrophotographic photosensitive member and a charging means of a contact charging roller type, wherein the charging means can stably maintain the charging performance for a long time; An object of the present invention is to provide an image forming apparatus provided with the process cartridge.

Another object of the present invention is to provide a charger for an image forming apparatus which can maintain the charging performance stably for a long period of time.

[0009]

The above object is achieved by a process cartridge, an image forming apparatus and a charger according to the present invention. In summary, the present invention has at least an electrophotographic photoreceptor and a charging unit for charging the electrophotographic photoreceptor, and in a process cartridge detachable from an image forming apparatus, the charging unit is a charging roller, A cleaning member that is in contact with and contacts the charging roller; and a moving member that supports the cleaning member and that can reciprocate along the longitudinal direction of the charging roller. A process cartridge which reciprocates continuously in the longitudinal direction in conjunction therewith.

According to another aspect of the present invention, in an image forming apparatus in which a process cartridge having at least an electrophotographic photosensitive member and a charging unit for charging the electrophotographic photosensitive member is detachably mounted, the charging unit includes: A charging roller, a cleaning member that comes into contact with the charging roller, and a moving member that supports the cleaning member and that can reciprocate along a longitudinal direction of the charging roller. An image forming apparatus is provided which reciprocates continuously in the longitudinal direction thereof in conjunction with rotation of a charging roller.

According to another aspect of the present invention, in the charger of the image forming apparatus, the charging roller, a cleaning member that comes into contact with and contacts the charging roller, and the cleaning member is supported, A movable member that can reciprocate along the longitudinal direction of the roller, wherein the cleaning member reciprocates continuously in the longitudinal direction in conjunction with the rotation of the charging roller. Is done.

According to one embodiment of the present invention, both ends of the woven portion of the conductive brush are cut obliquely with respect to the direction in which the fibers extend. Further, the conductive brush is floating from the ground. Further, according to one embodiment of the present invention, a moving range of the cleaning member in the longitudinal direction with respect to the charging roller is inside an exposed portion of a metal core included in the charging roller. The moving member is made of metal, and the cleaning member is attached to the moving member via an insulating member.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a process cartridge, an image forming apparatus and a charger according to the present invention will be described in more detail with reference to the drawings.

[Overall Description of Image Forming Apparatus] First, an overall configuration of a color image forming apparatus will be schematically described with reference to FIG. FIG. 1 shows a color laser printer which is an embodiment of a color image forming apparatus.

As shown in FIG. 1, the color laser printer includes an electrophotographic photosensitive member (photosensitive drum) 15 rotating at a constant speed, a fixed black developing device 21B, and a rotatable three-color developing device 21B.
An image forming unit including a color developing unit (a yellow developing unit 20Y, a magenta developing unit 20M, and a cyan developing unit 20C), and a color image developed and multi-transferred in the image forming unit; An intermediate transfer body 9 is provided for further transferring the image onto the transfer material 2 fed from the transfer material feeding unit. Transfer material 2 on which a color image has been transferred from intermediate transfer body 9
Is conveyed to the fixing section 25 and is fixed on the transfer material 2, and is discharged to the discharge section 37 on the upper surface of the apparatus by discharge rollers 34, 35 and 36.

The three-color rotary developing device and the fixed black developing device are configured to be individually detachable from the printer main body.

Next, the configuration of each section of the image forming apparatus will be described in detail sequentially.

[Electrophotographic Photoreceptor Unit] The drum cartridge 13 which is an electrophotographic photoreceptor unit, that is, the process cartridge in the present embodiment, also serves as an electrophotographic photoreceptor (photosensitive drum) 15 and a holder for the electrophotographic photoreceptor 15. The container 14 of the cleaning device is integrally formed. The drum unit 13 is detachably supported by mounting means 53 of the printer main body, and is configured so that the unit can be easily replaced in accordance with the life of the electrophotographic photosensitive member 15.

The electrophotographic photoreceptor 15 according to the present embodiment is formed by coating an organic photoconductor layer on the outside of an aluminum cylinder having a diameter of 60 mm, and is rotatably supported by the container 14 of the cleaning device as described above. ing.

A cleaner blade 16 and a primary charging means 17 are arranged on the periphery of the electrophotographic photosensitive member 15, and the driving force of a driving motor (not shown) is transmitted to one end of the electrophotographic photosensitive member 15 so that the electrophotographic photosensitive member 15 is driven by an electrophotographic photosensitive member. The photoreceptor 15 is rotated counterclockwise in the figure according to the image forming operation.

[Charging Means] The primary charging means 17 is a charging roller using a contact charging method. The charging roller is brought into contact with the electrophotographic photosensitive member 15, and a voltage is applied to the charging roller 17. It charges the surface of the body 15 uniformly. The charging roller 17 has a metal core 17a extending in the longitudinal direction at the center thereof, and both end portions are exposed portions 17b, 17b. Then, the springs 18, 18 urge the exposed portions 17 b, 17 b toward the electrophotographic photosensitive member 15, so that the charging roller 17 is brought into contact with the electrophotographic photosensitive member 15 as described above.

A cleaning brush for cleaning is in contact with the charging roller 17, and the charging roller cleaning mechanism will be described later in detail.

[Exposure Means] Exposure to the electrophotographic photosensitive member 15 is performed from the scanner section 30. That is, when an image signal is given to the laser diode, the laser diode irradiates an image corresponding to the image signal to the polygon mirror 31.

The polygon mirror 31 is a scanner motor 3
1a, the image light, which is rotated at high speed and reflected by the polygon mirror 31, selectively exposes the surface of the electrophotographic photosensitive member 15 rotating at a constant speed via the imaging lens 32 and the reflection mirror 33, and as a result, the electrophotography is performed. An electrostatic latent image is formed on the photoconductor 15.

[Developing Unit] The developing unit is a three-rotation developing unit 20Y capable of developing each color of yellow, magenta, cyan, and black as described above in order to visualize the electrostatic latent image. , 20M, 20C and one black developing device 21
B.

The black developing device 21B is a fixed developing device, and a developing sleeve 21BS is provided at a position facing the electrophotographic photosensitive member 15.
Are arranged at a minute interval (about 300 μm) with respect to the electrophotographic photosensitive member 15 to form a visible image with black toner on the electrophotographic photosensitive member 15.

The black developing unit 21B feeds the toner in the container to the toner supply roller 21BR side by the feed mechanism 21BT, and the application blade 21BB pressed against the outer periphery of the developing sleeve 21BS rotates the developing sleeve 21BS rotating clockwise in FIG. A thin layer of toner is applied to the outer periphery, and a charge is applied to the toner (frictional charging).

Further, by applying a developing bias to the developing sleeve 21BS, the electrostatic latent image on the surface of the electrophotographic photosensitive member 15 is visualized as a toner image.

Three rotating developing units 20Y, 20M, 20C
, Each containing 6000 pages (A4, 5% printing) of toner, and are detachably held as units on a developing rotary 23 that rotates about a shaft 22.

At the time of image formation, each developing device is rotated around a shaft 22 while being held by a developing rotary 23, a predetermined developing device is stopped at a position facing the electrophotographic photosensitive member 15, and a developing sleeve is further provided. Is positioned so as to face the electrophotographic photosensitive member 15 at a small interval (about 300 μm), and then forms a visible image corresponding to the electrostatic latent image on the electrophotographic photosensitive member 15.

When a color image is formed, the developing rotary 23 rotates for each rotation of the intermediate transfer member 9 and the yellow developing device 20 rotates.
The developing process is performed in the order of Y, magenta developing device 20M, cyan developing device 20C, and then black developing device 20B.

For example, as shown in FIG. 1, when the developing process is performed, the yellow developing device 20Y is positioned and stopped at a position facing the drum cartridge 13, and the toner in the container is fed by a feed mechanism to the coating roller 20YR. Send to The blade 20 pressed against the outer periphery of the coating roller 20YR and the developing sleeve 20YS rotating clockwise in the drawing.
YB is a developing sleeve 20YS that rotates clockwise in the figure.
A thin layer of toner is applied to the outer periphery of the toner and charge is applied to the toner (frictional charging).

A toner is developed on the electrophotographic photosensitive member 15 according to the latent image by applying a developing bias to the developing sleeve 20YS facing the electrophotographic photosensitive member 15 on which the latent image is formed.

Magenta developing device 20M, cyan developing device 20
For C, toner development is performed by the same mechanism as described above.

Each of the rotary developing devices 20Y, 20M, 20C
When each developing device is rotated to the developing position, each developing sleeve is connected to a high-voltage power supply for each color development provided in the printer main body and a drive, and a voltage is sequentially and selectively applied for each color development. The drive is applied and transmitted.

[Intermediate Transfer Body] In the intermediate transfer body 9, during the color image forming operation, the toner image on the electrophotographic photosensitive member 15 visualized by each developing device is printed four times (Y, M, C, B four times).
In order to receive multiple transfer over each color image), it rotates clockwise in the figure in synchronization with the outer peripheral speed of the electrophotographic photosensitive member 15. Further, the intermediate transfer body 9 that has undergone the multiple transfer simultaneously multiplex-transfers the toner images of the respective colors on the intermediate transfer body 9 onto the transfer material 2 by nipping and transporting the transfer material 2 by a transfer roller 10 to which a voltage is applied. .

The intermediate transfer member 9 according to this embodiment has a diameter of 18
The outer circumference of a 0 mm aluminum cylinder 12 is covered with an elastic layer 11 such as a medium resistance sponge or medium resistance rubber.
The intermediate transfer body 9 is rotatably supported, and is rotated by being driven by an integrally fixed gear (not shown).

[Cleaning Means] The cleaning means removes the toner remaining on the electrophotographic photosensitive member 15 after the toner visualized on the electrophotographic photosensitive member 15 by the developing means is transferred to the intermediate transfer member 9. It is to be cleaned. The removed toner that has been cleaned is stored in the container 14. The amount of the removed toner stored in the container 14 does not fill the container 14 earlier than the life of the electrophotographic photoreceptor 15, and therefore, the container 14 is simultaneously replaced when the life of the electrophotographic photoreceptor 15 is replaced.

As shown in more detail in FIG. 2, the container 14 has a removed toner intake chamber 43 and a removed toner storage chamber 44 integrally formed by frames 41, 101, and 102. 43, a cleaning blade 16 and a cleaning roller 18 including a contact portion 16a disposed in contact with the electrophotographic photoreceptor 15,
A transport roller 45 and a removed toner inlet 45 are provided.

[Sheet Feeding Unit] The sheet feeding unit feeds the transfer material 2 to the image forming unit, and includes a cassette 1 containing a plurality of transfer materials 2, feed rollers 3 and 4, and double feed prevention. Mainly comprises a retard roller 5, a paper feed guide 6, a transport roller 7, and a registration roller 8.

At the time of image formation, the paper feed roller 3 is driven to rotate in accordance with the image forming operation, and the transfer material 2 in the cassette 1 is removed by one.
The sheet is separated and fed one by one, guided by the guide plate 6, and reaches the registration roller 8 via the transport roller 7.

During the image forming operation, the registration roller 8 performs a non-rotating operation of keeping the transfer material 2 stationary and a rotating operation of transporting the transfer material 2 toward the intermediate transfer member 9 in a predetermined sequence. The position of the image and the transfer material 2 at the time of the transfer step, which is the next step, is aligned.

[Transfer Section] The transfer section is composed of a swingable transfer roller 10. The transfer roller 10 has a metal shaft wound around a medium-resistance foam elastic material, and can be moved up and down in the figure and driven. Having.

While the four-color toner image is being formed on the intermediate transfer member 9, that is, while the intermediate transfer member 9 is rotating a plurality of times, the transfer roller 10 is indicated by a solid line in the drawing so as not to disturb the image. It is located below and separated from the intermediate transfer member 9.

After the formation of the four color toner images on the intermediate transfer member 9, the transfer roller 10 is indicated by a thin line in the figure by a cam member (not shown) in accordance with the timing of transferring the color image onto the transfer material 2. At the upper position, it is pressed against the intermediate transfer body 9 via the transfer material 2 with a predetermined pressure. At this time, a bias is applied to the transfer roller 10 at the same time, and the toner image on the intermediate transfer body 9 is transferred to the transfer material 2.

Here, since the intermediate transfer member 9 and the transfer roller 10 are driven respectively, the transfer material 2 sandwiched between the two is subjected to the transfer process and at the same time, at a predetermined speed in the left direction in the figure. And is sent to the fixing unit 25 which performs the next process.

[Fixing Unit] The fixing unit 25 includes a developing unit 20,
The fixing device 26 fixes the toner image formed on the transfer material 2 via the intermediate transfer member 9 to the toner image formed by the fixing member 21. As shown in FIG. And a pressure roller 27 for pressing the transfer material 2 against the fixing roller 26. Each roller 26, 27
Is a hollow roller, which has heaters 28 and 29 inside thereof, and is configured to be driven to rotate and to convey the transfer material 2 at the same time.

That is, the transfer material 2 holding the toner image is transported by the fixing roller 26 and the pressure roller 27,
By applying heat and pressure, the toner is fixed on the transfer material 2.

[Charging Roller Cleaning Mechanism] The cleaning mechanism of the charging roller 17 will be described with reference to FIGS.

As shown in FIGS. 2 and 3, the charging roller 17
Above the moving member 72 in parallel with the charging roller 17.
The conductive cleaning brush 71 is fixed to the moving member 72, and a part of the brush 17 is in contact with the charging roller 17 in the axial direction, that is, in the longitudinal direction.

The moving member 72 is made of a metal bar, and is shown in FIG.
As shown in (1), both ends are supported by bearings 72a and 72b fixed to the cartridge frame 40 so as to be movable in the longitudinal direction. A reciprocating return spring 74 as an urging means is attached to one end (the left end in the figure) of the moving member 72, and the moving member 72 is constantly urged rightward in the figure by the elastic force of the reciprocating return spring 74. . Also,
A reciprocating lever 73 is attached to the other end of the moving member 72.

In the vicinity of the reciprocating lever 73, a shaft member 80 is fixed to the cartridge frame 40 in parallel with the moving member 72, as is apparent from FIG. And a cylindrical cam 76 integrally fixed to the left side of the gear 75 in the figure are rotatably mounted in the direction of the arrow.

The reciprocating lever 73 urged rightward in the figure by the reciprocating return spring 74 is always in contact with the cylindrical cam 76 having a tapered cross section. The reciprocating lever 73 is fitted in a support guide 77 in the cartridge frame 40.

In such a configuration, when the gear 75 is rotated in the direction of the arrow by an appropriate means, the cylindrical cam 76 is simultaneously rotated, and the reciprocating lever 73 follows the cylindrical cam 76 and reciprocates in the longitudinal direction of the moving member 72. Moving. In this embodiment, reciprocating movement of about 5 mm is repeated.

The reciprocating range of the moving member 72, that is, the moving range in the longitudinal direction of the cleaning brush is set inside the exposed portion 17b of the metal core 17a of the charging roller 17. Since the cleaning brush 71 does not contact the exposed portion 17b of the core 17a of the charging roller 17 as described above, the conductive cleaning brush 71 contacts the core 17a having a different potential from the surface of the charging roller 17 for cleaning. It is possible to suppress generation of unstable noise caused by a change in the potential of the brush 71.

The cleaning brush 71 constantly reciprocates in the longitudinal direction in accordance with the rotation of the charging roller 17 while slightly contacting the charging roller 17, so that fine particles generated during charging, floating toner in the machine, dust, etc. Can be prevented, a remarkable voltage drop point can be prevented from occurring, and the charging performance can be maintained.

Next, the cleaning brush 71 will be described in detail mainly with reference to FIGS.

The cleaning brush 71 is a flat brush of a crochet weave in which brush fibers are folded back at a woven portion 71a as shown in FIG. Fixed. Thus, the brush portion 71b can slightly contact the charging roller 17. The brush 71b
In this embodiment, the hair has a length L = about 10 mm.

The edges at both ends of the planar cleaning brush 71 are cut obliquely inward from a direction parallel to the brush portion 71b. In this embodiment, α is cut to about 15 degrees. This is because if the cut surface is made parallel to the fiber direction (at right angles to the warp in the longitudinal direction), it becomes easier to fray, and the bristle of the conductive brush easily occurs. That's why. This allows
It is possible to prevent the conductive fiber from falling and approaching the high-voltage portion, and prevent a device failure accident such as a high-pressure leak from occurring.

As shown in FIG. 5, the cleaning brush 71 has a weaving portion 71a having a movable member 7 via an insulating sheet 78.
It is fixed to 2. Thus, generation of unstable noise can be suppressed.

The cleaning brush 71 of this embodiment is floating from the ground. In other words, by not grounding,
The conductive brush rubbed against the charging roller is electrically at a potential similar to that of the charging roller, so that the cleaning brush is scattered on the charging roller surface, such as floating dust and charging products, and the charge is easily attracted to the charging roller again. Charging can be prevented.

The cleaning brush 71 is in contact with the charging roller 17 in the forward direction with respect to the rotation direction. The brush 71 is always in contact with the charging roller 17 and continuously reciprocates in the longitudinal direction corresponding to the rotation of the electrophotographic photosensitive member 15 and the charging roller 17.

As described above, since the brush portion 71b abuts in the forward direction, it is possible to prevent a large gap from being formed between adjacent brush fibers, and to stably clean the charging roller.

The contact position of the cleaning brush 71 is maintained by the support guide 77 into which the reciprocating lever 73 is fitted.

As described above, the cleaning brush 71 reciprocates in the longitudinal direction continuously in accordance with the rotation of the charging roller 17 while slightly contacting the charging roller 17, so that the fine particles generated during the charging and the floating inside the machine can be obtained. Adhered matter such as toner and dust can be prevented, a remarkable voltage drop point can be prevented, and charging performance can be maintained.

Further, even if the deposits adhere to the charging roller 17, the cleaning brush constantly scatters the deposits, so that the charging roller 17 can maintain a stable charging performance continuously throughout its life.

[0067]

As is apparent from the above description, according to the present invention, a cleaning member which comes into contact with and abuts on the charging roller, the cleaning member is supported, and the cleaning member reciprocates along the longitudinal direction of the charging roller. The cleaning member reciprocates continuously in the longitudinal direction in conjunction with the rotation of the charging roller, so that it is possible to suppress deposition of deposits on the surface of the charging roller. It is possible to obtain a charger, a process cartridge including the charger, and an image forming apparatus that can maintain the charging performance stably for a period and contribute to good image formation.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram illustrating a color laser printer according to an embodiment of an image forming apparatus according to the present invention.

FIG. 2 is a sectional view of a drum cartridge of the image forming apparatus of FIG.

FIG. 3 is an explanatory view showing a main part of the drum cartridge of FIG. 2;

FIG. 4 is a plan view of the drum cartridge of FIG. 2;

FIG. 5 is a sectional view showing a charging unit according to the present invention.

FIG. 6 is a partially enlarged view of a cleaning brush of a charging unit.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 photosensitive drum (electrophotographic photosensitive member) 13 drum cartridge (process cartridge) 17 charging roller (charging means) 71 cleaning brush (conductive brush) 71 a weaving unit 71 b brush unit 72 moving member 78 insulating member

Continued on the front page (72) Inventor Yuki Mori 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term in Canon Inc. (reference) 2H003 AA12 BB11 CC05 EE20 2H071 BA04 BA13 BA22 BA27 BA35 DA06 DA15 DA34

Claims (18)

[Claims] 1. A process cartridge having at least an electrophotographic photosensitive member and a charging unit for charging the electrophotographic photosensitive member, the charging unit being a charging roller, wherein the charging unit is a charging roller. And a moving member that supports the cleaning member and that can reciprocate along the longitudinal direction of the charging roller, wherein the cleaning member interlocks with the rotation of the charging roller. A process cartridge which reciprocates continuously in the longitudinal direction. 2. The cleaning member is a planar conductive brush including a fiber portion extending in a direction perpendicular to a longitudinal direction of the charging roller, wherein the fiber portion includes a woven portion;
2. The process cartridge according to claim 1, further comprising a brush, wherein the cleaning member fixes the weaving portion to the moving member, and abuts the brush on the charging roller in a forward direction. 3. The process cartridge according to claim 2, wherein both ends of the woven portion of the conductive brush are cut obliquely to a direction in which the fibers extend. 4. The process cartridge according to claim 2, wherein said conductive brush is floating from the ground. 5. A moving range of the cleaning member in a longitudinal direction with respect to the charging roller is inside an exposed portion of a metal core included in the charging roller.
Or 4 process cartridges. 6. The process cartridge according to claim 2, wherein said moving member is made of metal, and said cleaning member is attached to said moving member via an insulating member. 7. An image forming apparatus in which a process cartridge having at least an electrophotographic photosensitive member and a charging unit for charging the electrophotographic photosensitive member is detachably mounted, wherein the charging unit is a charging roller, and the charging roller is And a moving member that supports the cleaning member and that can reciprocate along the longitudinal direction of the charging roller, wherein the cleaning member interlocks with the rotation of the charging roller. An image forming apparatus which reciprocates continuously in the longitudinal direction. 8. The cleaning member is a planar conductive brush including a fiber portion extending in a direction orthogonal to a longitudinal direction of the charging roller, wherein the fiber portion is a woven portion,
The image forming apparatus according to claim 7, further comprising a brush unit, wherein the cleaning member fixes the weaving unit to the moving member, and abuts the brush unit on the charging roller in a forward direction. 9. The image forming apparatus according to claim 8, wherein both ends of the woven portion of the conductive brush are cut obliquely to a direction in which the fibers extend. 10. The image forming apparatus according to claim 8, wherein said conductive brush is floating from ground. 11. The moving range of the cleaning member in the longitudinal direction with respect to the charging roller is inside an exposed portion of a metal core included in the charging roller.
Or 10 image forming apparatuses. 12. The image forming apparatus according to claim 8, wherein said moving member is made of metal, and said cleaning member is attached to said moving member via an insulating member. 13. A charging device of an image forming apparatus, wherein the charging roller, a cleaning member that comes into contact with the charging roller, supports the cleaning member, and is reciprocally movable along a longitudinal direction of the charging roller. A movable member, wherein the cleaning member reciprocates continuously in the longitudinal direction in conjunction with the rotation of the charging roller. 14. The cleaning member is a planar conductive brush including a fiber portion extending in a direction perpendicular to a longitudinal direction of the charging roller, wherein the fiber portion includes a woven portion and a brush portion, 14. The charger according to claim 13, wherein the cleaning member fixes the weaving portion to the moving member, and abuts the brush portion on the charging roller in a forward direction. 15. The both ends of the woven portion of the conductive brush are cut obliquely to the direction in which the fibers extend.
Charger. 16. The charger according to claim 14, wherein the conductive brush is floating from the ground. 17. A moving range of the cleaning member in a longitudinal direction with respect to the charging roller is inside an exposed portion of a metal core included in the charging roller.
5 or 16 chargers. 18. The charger according to claim 14, wherein the moving member is made of metal, and the cleaning member is attached to the moving member via an insulating member.