JP2008122876A - Cleaning device and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning device having a configuration capable of improving cleaning performance by surely recovering toner and paper powder that have not been scraped off. <P>SOLUTION: The cleaning device 10 cleans off toner and paper powder remaining on a belt-like transfer body to which a visible image formed on a latent image carrier is transferred. The cleaning device 10 includes first and second cleaning parts along the direction of movement of the belt-like transfer body 2. The first cleaning part is located upstream in the direction of movement of the belt-like transfer body 2 and uses a cleaning roller 10A rotatable in contact with the belt-like transfer body. The second cleaning part is located downstream of the first cleaning part in the direction of movement of the belt-like transfer body 2 and uses a cleaning blade 10B having a leading end disposed in contact with the belt-like transfer body 2. The moving direction of the belt-like transfer body 2 can be switched at the start of an image formation period and at the end of an image formation period. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cleaning device and an image forming apparatus, and more particularly to a cleaning mechanism for a belt used in a transfer process.

In an image forming apparatus such as a copying machine, a facsimile machine, a printer, or a printing machine, an electrostatic latent image formed on a photosensitive member, which is a latent image carrier, is processed with a visible image, and the visible image is transferred. A sheet-like recording medium (hereinafter referred to as a recording sheet) such as a recording paper or an OHP film that is carried is used for fixing to a fixing device to obtain a copy or a printed output.

The image formed on the photoconductor may be a full-color image as well as a monochrome image.
In the transfer process when forming a full-color image, in addition to the configuration in which the image of each color is sequentially transferred in the process of moving the recording sheet to the image forming unit in which a plurality of photoconductors are juxtaposed, an intermediate transfer member such as a belt There is a configuration in which primary transfer is performed and secondary transfer is performed in which a superimposed image obtained by the primary transfer is collectively transferred to a recording sheet (for example, Patent Document 1).

  The intermediate transfer member is subjected to a cleaning process when the batch transfer of the superimposed image onto the recording sheet is completed.

  2. Description of the Related Art Conventionally, as a member used in a cleaning process, a configuration using a cleaning blade in which an edge of a tip is brought into contact with an intermediate transfer member is known (for example, Patent Document 2).

  The cleaning blade has a function of normalizing by scraping off residual toner and paper dust with the leading edge.

  By the way, as disclosed in Patent Document 2, when a cleaning blade is used, the toner is nearly spherical, so that it is easy to scoop off with the leading edge of the blade, but the paper dust as the paper fiber has a rod shape. Therefore, a large amount of paper dust may adhere to and accumulate on the leading edge of the cleaning blade.

  Accumulation of paper dust causes fine flaws on the surface of the intermediate transfer member or slipping out of toner, leading to problems such as image stains and background stains.

  Thus, conventionally, a configuration has been proposed in which a brush roller or the like that contacts an intermediate transfer member that moves toward a cleaning blade is provided to scrape paper dust (for example, Patent Document 3).

JP 2006-078679 (paragraph "0002" column) JP 10-268728 A (paragraph "0005" column) Japanese Patent Publication No. 2003-215938 (paragraph "0037" column)

  Although the cleaning effect on the intermediate transfer body can be obtained by scraping off residual toner and paper dust with the brush roller before the intermediate transfer body goes to the cleaning blade, there are toner and paper powder that are not collected by the cleaning brush. May move to the tip edge portion of the cleaning blade and accumulate, which may cause the above-mentioned problems to reoccur.

  SUMMARY OF THE INVENTION In view of the problems in the conventional cleaning device, the object of the present invention is to provide a cleaning with a configuration capable of improving the cleaning property by reliably collecting toner and paper powder that have not been scraped off. An apparatus and an image forming apparatus are provided.

  In order to achieve the above object, the present invention comprises the following arrangement.

(1) A cleaning device for cleaning toner or paper powder remaining on a belt-like transfer body to which a visible image formed on a latent image carrier is transferred,
First and second cleaning portions are provided along the moving direction of the belt-shaped transfer member, and the first cleaning portion is located upstream of the belt-shaped transfer member in the moving direction and contacts the belt-shaped transfer member. A rotatable cleaning roller is used, and a tip that contacts the belt-shaped transfer member is located downstream of the first cleaning unit in the moving direction of the belt-shaped transfer member in the second cleaning unit. A cleaning blade with
The cleaning device according to claim 1, wherein the belt-like transfer member is capable of switching a moving direction between image formation and image formation end.

  (2) The belt-shaped transfer member moves in a direction opposite to the moving direction at the time of image formation by a distance moved between the first and second cleanings at the end of image formation. The cleaning device described.

(3) While the belt-state transfer member moves in the direction opposite to that at the time of image formation, the cleaning roller positioned in the first cleaning unit is kept rotating in a direction relative to the moving direction of the belt-like transfer member. The cleaning device according to (1) or (2), wherein:
(4) The cleaning roller located in the first cleaning section stops for a time corresponding to the reverse movement of the belt-shaped transfer member, and starts rotating in the rotation direction at the time of image formation again after the time has elapsed. The cleaning apparatus according to any one of (1) to (3).

  (5) The cleaning device according to any one of (1) to (4), wherein the movement of the belt-shaped transfer member and the cleaning roller can be independently controlled.

  (6) The cleaning roller and the cleaning blade positioned in the first and second cleaning portions sandwich the extending member disposed on the inner side of the belt-shaped transfer body in the moving direction of the belt-shaped transfer body. The cleaning device according to claim 1, wherein the cleaning device is disposed at a position facing each other.

  (7) The cleaning device according to any one of (1) to (6), wherein the cleaning roller is a brush roller capable of contacting the belt-shaped transfer member.

  (8) An image forming apparatus using the cleaning device according to any one of (1) to (7).

  (9) A feature of (8), wherein a plurality of image forming portions capable of independently forming images of a plurality of colors are juxtaposed along a direction in which the belt-shaped transfer member is stretched to form a full color image. The image forming apparatus described.

  According to the present invention, since the belt-state transfer member can move in the direction opposite to that at the time of image formation, the toner or paper that has passed through the cleaning roller of the first cleaning unit when moving at the time of image formation. Even when the powder is dammed up and accumulated on the cleaning blade of the second cleaning unit, the belt-shaped transfer member is moved in the direction opposite to that at the time of image formation and separated from the tip of the cleaning blade by the cleaning roller. Toner and paper dust can be collected.

  In particular, in the first aspect of the present invention, toner and paper deposited on a cleaning blade provided at the rear of the belt-like transfer member in the movement direction are provided with first and second cleaning portions along the movement direction of the belt-state transfer member. Since the powder can be collected by the cleaning roller located in front of the moving direction, it is possible to eliminate the accumulation at the tip of the cleaning blade by separating the toner and paper dust deposited on the tip of the cleaning blade.

  According to the second aspect of the present invention, the belt-shaped transfer member is moved in the direction opposite to that at the time of image formation by the distance moved between the cleaning units of the first unit 2 at the end of image formation. Toner and paper dust accumulated between the cleaning blade and the belt-shaped transfer member can be collected away from the position by the cleaning roller located in the first cleaning portion.

  According to the third aspect of the present invention, since the cleaning roller positioned in the first cleaning rotates in the direction relative to the transfer body when the belt-shaped transfer body moves in the reverse direction, the toner separated from the second cleaning section It is possible to make it easy to scrape off paper dust.

  According to a fourth aspect of the present invention, the cleaning roller located in the first cleaning section stops rotating when the belt-state transfer member moves in the reverse direction, and when the reverse movement is completed, the same direction as when forming the image. Since the rotation is started, it is possible to prevent the toner and paper dust collected by the cleaning roller due to the reverse movement, and to reduce the friction with the belt-shaped transfer member during the reverse movement.

  In the fifth aspect of the invention, since the belt-shaped transfer member and the cleaning roller can be controlled to move independently, the moving speed of the cleaning roller relative to the belt-state transfer member can be set to the most efficient speed for scraping. it can.

  In the sixth aspect of the present invention, since the members used for the first and second cleaning portions are disposed in the moving direction of the belt-shaped transfer body with the member for extending the belt-shaped transfer body interposed therebetween, the cleaning is performed. The scraping efficiency can be prevented from being lowered by the contact thickness of the roller and the cleaning blade effectively acting on the belt-shaped transfer member.

  According to the seventh to ninth aspects of the present invention, it is possible to prevent the occurrence of an abnormal image by effectively removing the residual toner and paper dust from the belt-like transfer body onto which the image is transferred.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of an image forming apparatus 1 to which a cleaning device according to the present invention is applied.
An image forming apparatus 1 shown in FIG. 1 has a tandem configuration in which a plurality of photoreceptors as latent image carriers capable of forming a color image corresponding to color separation are juxtaposed, and toner formed on each photoreceptor. The color printer is capable of forming a multicolor image by superimposing and transferring an image onto an intermediate transfer member and then transferring the superimposed image onto a sheet such as recording paper. In the present invention, the image forming apparatus is not limited to a color printer, but of course includes a color copying machine, a facsimile machine, and a printing machine.

In FIG. 1, in a color printer 1, an image forming unit 1A is positioned at a central portion in the vertical direction, a document feeding unit 1B is provided below the image forming unit 1A, and an original document table 1C1 is provided above the image forming unit 1A. Each of the scanning units 1C is arranged.
In the image forming unit 1A, a transfer unit composed of an intermediate transfer belt 2 is disposed as an intermediate transfer member having a horizontally extending surface, and the intermediate transfer belt 2 has a complementary color relationship with a color separation color. A configuration for forming an image of a certain color is provided.

The image forming unit 1A is provided with an image forming unit capable of forming an image with toners of complementary colors (yellow, magenta, cyan, black), and each image forming unit is a photosensitive member capable of carrying an image. The bodies 3B, 3C, 3M, and 3Y are juxtaposed along the extended surface of the intermediate transfer body 2. In the following description, in the case of contents common to all the photoconductors, the photoconductor is denoted by reference numeral 3.
Each of the photoconductors 3B, 3C, 3M, and 3Y is composed of a drum that can rotate in the same direction (counterclockwise in FIG. 1). A device 4, a writing device 5, a developing device 6, a primary transfer device 7 which is one of transfer bias applying means, and a cleaning device 8 are arranged (for the sake of convenience, the reference numerals of the respective devices are used for the photosensitive member 3B). B is shown).

  The intermediate transfer belt 2 corresponds to a primary transfer unit to which a visible image from an image forming unit including each photoconductor is sequentially transferred. The intermediate transfer belt 2 is wound around a plurality of rollers 2A to 2C and is connected to the photoconductor. A roller 2C, which is configured to be movable in the same direction at the facing position and is different from the rollers 2A and 2B constituting the stretched surface, faces the secondary transfer device 9 with the intermediate transfer belt 2 interposed therebetween. Due to the installation space of the intermediate transfer belt 2, a part of the extended surface between the portions wound around the roller indicated by reference numeral 2 </ b> A and the roller indicated by reference numeral 2 </ b> B is extended in the horizontal direction. An extension tension is applied by a tension roller indicated by reference numerals 2D and 2E located at the end of the part.

  The secondary transfer device 9 includes a transfer belt 9C that is wound around the charging drive roller 9A and the driven roller 9B and is movable in the same direction as the intermediate transfer belt 2 at the secondary transfer position where the secondary transfer device 9 is located. The multi-color image superimposed on the intermediate transfer belt 2 in the process of transporting the recording sheet while electrostatically attracting it by charging the transfer belt 9C with the charging drive roller 9A can be transferred by single transfer or carried by a single color. Each image can be transferred to a recording sheet.

A recording sheet is fed from the paper feeding unit 1B to the secondary transfer position.
The paper feed unit 1B includes a plurality of paper feed cassettes 1B1, a plurality of transport rollers 1B2 arranged in a transport path for recording sheets fed from the paper feed cassette 1B1, and a registration roller 1B3 positioned in front of the secondary transfer position. I have. In this embodiment, in addition to the conveyance path of the recording sheet fed out from the sheet feeding tray 1B1, a recording sheet of a type not stored in the sheet feeding cassette 1B1 is fed to the sheet feeding unit 1B toward the secondary transfer position. This configuration includes a manual feed tray 1A1 and a feeding roller 1A2 provided with a part of the wall surface of the image forming unit 1A that can be turned up and down.
In the middle of the conveyance path of the recording sheet from the sheet feeding cassette 1B1 to the registration roller 1B3, the conveyance path of the recording sheet fed out from the manual feed tray 1A1 joins, and the recording sheet fed from any conveyance path is also a registration roller. Registration timing is set by 1B3.

  The writing device 5 (in FIG. 1, the writing light for forming a black image is indicated by reference numeral 5B for the sake of convenience) is an image obtained by scanning the document on the document table 1C1 in the document scanning unit 1C. The writing light is controlled by the information or image information output from a computer (not shown) to form an electrostatic latent image corresponding to the image information on the photoreceptors 3B, 3C, 3M, and 3Y.

  The document scanning unit 1C is provided with a scanner 1C2 that exposes and scans the document on the document table 1C1, and an automatic document feeder 1C3 is disposed on the upper surface of the document table 1C1. The automatic document feeder 1C3 has a configuration capable of reversing the document fed on the document table 1C1, and can perform scanning on both sides of the document.

  An electrostatic latent image on the photosensitive member 3 (members indicated by reference numerals 3B, 3C, 3M, and 3Y in FIG. 1) formed by the writing device 5 is indicated by reference numeral 6B in FIG. 1 for convenience. ) To be subjected to a visible image processing and primary transfer to the intermediate transfer belt 2. When the toner images for the respective colors are superimposed and transferred onto the intermediate transfer belt 2, the secondary transfer device 9 performs secondary transfer on the recording sheet at once.

The unfixed image carried on the surface of the recording sheet that has been secondarily transferred is fixed by the fixing device 11. Although not shown in detail, the fixing device 11 includes a belt fixing structure including a fixing belt heated by a heating roller and a pressure roller facing and abutting the fixing belt, and the contact between the fixing belt and the pressure roller. By providing the area, that is, the nip area, the heating area for the recording sheet can be expanded as compared with the fixing structure of another roller type.
The recording sheet that has passed through the fixing device 11 is switched in the transport direction by a transport path switching claw 12 disposed behind the fixing device 11, and is transported toward the paper discharge tray 13 and reversely transported. A transport direction is selected for the path RP.

  In the color printer 1 having the above-described configuration, the document placed on the document table 1C1 is exposed and scanned, or the image of the image information from the computer is used for statically charging the photosensitive member 3. After the electrostatic latent image is formed and the electrostatic latent image is subjected to visible image processing by the developing device 6, the toner image is primarily transferred to the intermediate transfer belt 2.

  The toner image transferred to the intermediate transfer belt 2 is transferred as it is to the recording sheet fed out from the paper feed unit 1B in the case of a single color image, and the primary transfer is repeated in the case of a multicolor image. And then secondarily transferred to the recording sheet at once. The recording sheet after the secondary transfer is fixed with an unfixed image by the fixing device 11 and then fed to the paper discharge tray 13 or reversed and fed again toward the registration roller 1B3.

  In FIG. 1, although not shown in detail, the intermediate transfer belt 2 includes a base layer composed of a base portion made of a material that hardly stretches, such as a fluorine-based resin having a small elongation or a rubber material having a large elongation, and a canvas, and the like. And an elastic layer made of fluorine-based rubber or acrylonitrile-butadiene copolymer rubber provided on the upper surface. The surface of the elastic layer is provided with a coat layer that is coated with a fluororesin to improve smoothness.

The intermediate transfer belt 2 is wound around at least a pair of support rollers 2A and 2B and a roller 2C having a backup function, and is driven by the counterclockwise rotation of the drive roller 2A.
A surface extended between the support rollers 2A and 2B, that is, a plane having no curvature, faces the photoreceptors 3B, 3Y, 3C, and 3M of each image forming unit. A transfer roller 2D for electrostatically transferring a visible image on the photoconductor is disposed at a position facing each photoconductor with the intermediate transfer belt 2 interposed therebetween.

The registration roller 1B3 used for feeding the recording sheet toward the secondary transfer position is generally used while being grounded, but a bias may be applied to remove paper dust from the recording sheet. Is possible.
For example, a bias is applied using a conductive rubber roller. The surface is a conductive NBR rubber having a diameter of 18 mm and a thickness of 1 mm. The electrical resistance is about 10E9Ω (10 ⁹ Ω) cm in volume resistance of the rubber material. The applied voltage is about −800V applied to the toner transfer side (front side), and the voltage of about + 200V is applied to the back side of the paper. Apply. Generally, in the intermediate transfer system, it is difficult for paper dust to move to the photoconductor, so that it is not necessary to consider paper dust transfer and may be grounded. Further, a DC bias is applied as the applied voltage, but this may be an AC voltage having a DC offset component in order to more uniformly charge the sheet. Thus, the paper surface after passing through the registration roller 49 to which a bias is applied is slightly charged on the negative side. Therefore, in the transfer from the intermediate transfer body 10 to the sheet, there are cases where the transfer conditions are changed and the transfer conditions are changed as compared with the case where no voltage is applied to the registration roller 49.

  The cleaning device according to the present invention is provided for the intermediate transfer belt 2 and is provided in the vicinity of one of the stretching rollers 2E of the intermediate transfer belt 2 as indicated by reference numeral 10 in FIG.

  FIG. 2 is a schematic diagram for explaining a main configuration of the cleaning device 10. In FIG. 2, first and second cleaning units are provided on the upstream side and the downstream side along the moving direction of the intermediate transfer belt 2. A cleaning roller 10A having a brush that contacts the intermediate transfer belt 2 on its peripheral surface, a so-called brush roller, is used for the first cleaning unit, and a tip of the second cleaning unit contacts the intermediate transfer belt 2. A possible polyurethane rubber cleaning blade 11B is used.

  The cleaning blade 10B is advantageous in that the material to be used is inexpensive and the tip edge is brought into contact with the intermediate transfer belt 2 so that toner and paper dust can be easily damped. However, since the intermediate transfer belt 2 is in direct contact with the recording sheet, paper dust tends to enter between the leading edge of the cleaning blade 10 </ b> B and the surface of the intermediate transfer belt 2.

  Therefore, in the present embodiment, as described above, the first cleaning unit is provided on the upstream side and the second cleaning unit is provided on the downstream side with the tension roller 2E in the moving direction of the intermediate transfer belt 2, and each unit is provided. The cleaning roller 10A and the cleaning blade 10B are respectively arranged.

  In this embodiment, in the moving direction of the intermediate transfer belt 2, the cleaning roller 10 </ b> A positioned at the first cleaning unit is disposed on the upstream side across the tension roller 2 </ b> E, and the cleaning blade 10 </ b> B is disposed on the downstream side. Since the toner and paper powder can be scraped off by the brush of the cleaning roller 10A, the amount of the toner and paper powder toward the cleaning blade 19B can be reduced.

By the way, in the present embodiment, the configuration for cleaning the intermediate transfer belt provided with the cleaning roller 10A and the cleaning blade 10B having the above-described arrangement configuration has the following characteristics.
(1) The movement direction of the intermediate transfer belt 2 can be switched between when the image is formed and when the image formation is completed. The intermediate transfer belt 2 is switched in the opposite movement direction between when the image is formed and when the image formation is completed.

  (2) The intermediate transfer belt 2 moves in the direction opposite to the movement direction at the time of image formation at the end of the image formation. As shown in FIG. The amount of movement corresponds to the distance moved between the two cleaning units.

  (3) The cleaning roller 10A maintains relative rotation, that is, rotation in the same direction as that during image formation when the intermediate transfer belt 2 moves in the direction opposite to that during image formation, or the intermediate transfer belt. No. 2 is stopped, and the rotation in the same direction as that at the time of image formation is resumed after the time when the intermediate transfer belt 2 has moved a predetermined distance in the reverse direction.

  In order to execute such characteristics, the intermediate transfer belt 2 and the cleaning roller 10A are driven and controlled independently.

  FIG. 4 is a block diagram for explaining a configuration related to drive control. In FIG. 4, the control unit 100 detects the drive amount of the drive source of the operation panel 101 and the intermediate transfer belt 2 on the input side. , A timer 103 for measuring the movement time of the intermediate transfer belt 2 in the reverse direction is connected, and on the output side, a motor M1 used as a drive source for the intermediate transfer belt 2 and a motor M2 used as a drive source for the cleaning roller 10A. The drive units 104 and 105 are connected.

The operation panel 101 connected to the input side of the control unit 100 is used to determine the end of image formation, and is determined to be the end of image formation when the number of sheets input by a number set key (not shown) is completed. To output information.
The encoder 102 is used for monitoring the moving speed and the moving amount of the intermediate transfer belt 2.

  The timer 103 measures the time necessary to move the distance based on the moving speed of the intermediate transfer belt 2 that is previously known in the control unit 100 and the distance L1 between the first and second cleaning units. Used for.

  When it is determined that the image formation is completed, the control unit 100 reverses the moving direction up to that point when the trailing edge of the recording sheet has passed the secondary transfer position. The reverse transfer time is discriminated by a signal from the timer 103, and the intermediate transfer belt 2 is stopped when moving between the first and second cleaning sections. When there is an instruction for image formation or image formation, image formation is performed again. The direction of movement in the hour is set.

  The cleaning roller 10A maintains its rotation when the intermediate transfer belt 2 moves in the reverse direction, or stops rotating when the intermediate transfer belt 2 moves in the reverse direction, and then rotates in accordance with the movement of the intermediate transfer belt 2 during image formation again. Can be resumed.

When the cleaning roller 10A stops when the intermediate transfer belt 2 moves in the reverse direction, the toner or paper dust that has been blocked by the cleaning blade 10B is blocked by the cleaning roller 10A, and when the rotation starts again, the intermediate transfer is performed. It is scraped off from the belt 2.
Further, when the relative rotation is maintained even when the intermediate transfer belt 2 is moved in the reverse direction, the above-described damming and scraping are performed almost simultaneously, and the cleaning roller 10A is new for the intermediate transfer belt 2. By sequentially facing the brush surfaces, a state where toner or paper dust is scraped off is obtained, and the degree of scraping can be increased.

  Since the present embodiment is configured as described above, residual toner and paper dust adhering to the intermediate transfer belt 2 at the time of image formation are scraped off by the cleaning roller 10A. Toner and paper dust are blocked by the cleaning blade 10B and removed. At this time, the toner or paper dust that is blocked by the cleaning blade 10B is removed by the cleaning roller, so that the amount repaired by the cleaning blade 10B is reduced, and slipping and the like are suppressed.

  On the other hand, the toner or paper dust that has been dammed up by the cleaning blade is accumulated in the direction opposite to the time when the intermediate transfer belt 2 forms the image at the end of the image formation (the arrow indicated by the two-dot chain line in FIG. Direction, the arrow indicated by the solid line indicates the movement direction at the end of image formation), and moves away from between the cleaning blade 10B and the intermediate transfer belt 2 as the intermediate transfer belt 2 moves in the reverse direction. And collected by the cleaning roller 10A. As a result, the toner and paper dust accumulated on the cleaning blade 10B are wiped out, so that the cleaning performance can be improved and the image contamination and background contamination due to the toner slipping out in the accumulated state can be reliably prevented. can do.

1 is a schematic diagram for explaining a configuration of an image forming apparatus to which a cleaning device according to an embodiment of the present invention is applied. It is a schematic diagram for demonstrating the principal part structure of a cleaning apparatus. It is a schematic diagram for demonstrating the characteristic of the principal part shown in FIG. It is a block diagram for demonstrating the structure of the control part which concerns on the cleaning apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Intermediate transfer belt 2E Tension roller 10 Cleaning apparatus 10A Cleaning roller 10B used for 1st cleaning part 10B It is a cleaning blade used for a 2nd cleaning part.

  100 Control unit

Claims (9)

A cleaning device for cleaning toner and paper powder remaining on a belt-like transfer body to which a visible image formed on a latent image carrier is transferred,
First and second cleaning sections are provided along the moving direction of the belt-shaped transfer body, and the first cleaning section is located upstream of the belt-shaped transfer body in the moving direction. A cleaning roller that can be rotated in contact with it is used, and the second cleaning unit is located downstream of the first cleaning unit in the moving direction of the belt-shaped transfer member and contacts the belt-shaped transfer member. A cleaning blade with a tip is used,
The cleaning device according to claim 1, wherein the belt-like transfer member is capable of switching a moving direction between image formation and image formation end.   3. The cleaning according to claim 2, wherein the belt-shaped transfer member moves in a direction opposite to a moving direction at the time of image formation by a distance moved between the first and second cleanings at the end of image formation. apparatus.   While the belt-state transfer member moves in the direction opposite to that at the time of image formation, the cleaning roller located in the first cleaning unit is kept rotated in a direction relative to the moving direction of the belt-like transfer member. The cleaning device according to claim 1 or 2, wherein   The cleaning roller located in the first cleaning unit stops for a time corresponding to the reverse movement of the belt-shaped transfer member, and starts rotating in the rotation direction at the time of image formation again after the time has elapsed. The cleaning device according to claim 1.   The cleaning apparatus according to claim 1, wherein the belt-shaped transfer body and the cleaning roller can be independently controlled for movement.   The cleaning roller and the cleaning blade positioned in the first and second cleaning sections are opposed to each other with the extending member disposed inside the belt-shaped transfer body in the moving direction of the belt-shaped transfer body. The cleaning device according to claim 1, wherein the cleaning device is disposed respectively.   The cleaning device according to claim 1, wherein the cleaning roller is a brush roller capable of contacting the belt-shaped transfer member.   An image forming apparatus using the cleaning device according to claim 1.   9. The image according to claim 8, wherein a full color image can be formed by juxtaposing a plurality of image forming portions capable of independently forming a plurality of color images along a direction in which the belt-shaped transfer body is stretched. Forming equipment.

Images