JP2007025173A - Cleaning device and image forming apparatus - Google Patents

Cleaning device and image forming apparatus Download PDF

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Publication number
JP2007025173A
JP2007025173A JP2005206119A JP2005206119A JP2007025173A JP 2007025173 A JP2007025173 A JP 2007025173A JP 2005206119 A JP2005206119 A JP 2005206119A JP 2005206119 A JP2005206119 A JP 2005206119A JP 2007025173 A JP2007025173 A JP 2007025173A
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Prior art keywords
cleaning
toner
brush
image carrier
image
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JP2005206119A
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Japanese (ja)
Inventor
Akihiro Ida
Masanori Kobayashi
明寛 井田
政憲 小林
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Fuji Xerox Co Ltd
富士ゼロックス株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a cleaning device capable of satisfactorily removing a large amount of toner such as an untransferred image or a toner whose polarity has changed.
A cleaning device includes a first brush cleaning mechanism and a second brush cleaning mechanism. The brush 51 </ b> A of the first brush cleaning mechanism 51 has a larger diameter than the brush 52 </ b> A of the second brush cleaning mechanism 52. Then, the first brush cleaning mechanism 51 adsorbs and removes the toner remaining on the intermediate transfer belt 20 by the electrostatic force by the brush 51A, and the second brush cleaning mechanism 52 removes the toner by electrostatic attraction force and mechanical force. Is configured to do.
[Selection] Figure 2

Description

  The present invention relates to a cleaning device that removes toner remaining on an image carrier after a transfer process in an image forming apparatus, and more particularly to a cleaning device that removes toner using a brush.

In electrophotographic image forming apparatuses used in printers, copiers, facsimiles, etc., electrostatic latent images formed on the surface of a photosensitive drum as an image carrier are visualized (toner images) by toner development. Further, this toner image is transferred to a recording paper or the like to obtain an image. In recent years, an image forming apparatus that obtains a full-color print image by superimposing a plurality of color toner images sequentially formed on a photosensitive drum on an intermediate transfer member and then transferring the toner image onto a recording sheet or the like has become widespread. .
In such an electrophotographic image forming apparatus, a photosensitive drum after the toner image is transferred to a recording paper or the like or an intermediate transfer member, or an intermediate transfer member after the toner image is transferred to a recording paper or the like (hereinafter referred to as these photosensitive members). And a cleaning device for removing toner remaining on the surface of the body drum and the intermediate transfer member.
Although there are several types of cleaning devices, a so-called blade type is often used in which a cleaning blade is pressed against the surface of the image carrier to mechanically scrape off the toner. In recent years, a so-called electrostatic brush system has also been adopted in which a voltage is applied to a conductive brush to electrostatically remove toner on the image carrier.

  By the way, in the image forming apparatus, there is a case where the toner image carried on the image carrier is not transferred onto the recording paper and reaches the cleaning device due to occurrence of a problem such as a jam of the recording paper. In such a case, the cleaning device must process a large amount of toner. In particular, in a color image forming apparatus, the amount of toner carried by the image carrier is large, and it is necessary to process more toner. In addition, at the time of initial setting at the time of turning on the power, a toner image that is not transferred onto the recording paper is also formed on the image carrier for the purpose of collecting control information. Furthermore, during normal transfer, the amount of toner remaining on the image carrier after transfer is small, but it changes to a reverse polarity due to discharge at the transfer portion, increasing the adhesion to the image carrier. There is something that is.

The cleaning device is required to have a performance capable of satisfactorily cleaning these large quantities of toner having different electrical conditions.
The blade-type cleaning device can clean toner having different conditions ranging from a large amount to a small amount. However, the paper powder or the carrier mixed with the toner adhering to the recording paper may adhere to the blade, resulting in poor cleaning. In addition, sudden failure due to blade chipping and deterioration of cleaning performance over time due to edge wear are inevitable.
On the other hand, the electrostatic brush type cleaning device has few problems such as problems caused by paper dust and a carrier, and performance degradation due to breakage of a blade or deterioration over time. However, it is difficult to remove toner having different electrical conditions. In addition, when a large amount of toner such as an untransferred image is input, there is a problem that the electrostatic adsorption force of the brush is weakened by supplying a large amount of charge, and it becomes impossible to remove all the toners satisfactorily. is there.

In order to solve these problems in the electrostatic brush type cleaning device, configurations as disclosed in Patent Documents 1 and 2 have been proposed.
That is, in the configuration disclosed in Patent Document 1, a charging roller is provided on the upstream side of the cleaning unit, and this charging roller reverses the polarity that applies the residual toner carried by the image carrier to the fur brush of the cleaning unit. It is charged with polarity. Thus, if all the toner before entering the cleaning unit is charged to, for example, a negative polarity, it can be cleaned with a positive fur brush.
In addition, the configuration disclosed in Patent Document 2 includes two brushes, and applies a bias voltage of a positive polarity opposite to the toner to the first brush and a negative polarity to the second brush. As a result, the toner changed to the reverse polarity by the discharge at the transfer portion can be adsorbed and removed by the second brush.

Japanese Patent Laid-Open No. 2001-201949 (pages 3 to 4, FIG. 3) JP 2002-229344 A (pages 11 to 12, FIG. 3)

  However, in the conventional configuration as described above, when a large amount of toner such as an untransferred image remains on the image carrier, the problem that the toner cannot be completely removed due to a potential change or the like cannot be solved. Met.

  The present invention has been made to solve the technical problems as described above, and the object of the present invention is to satisfactorily remove a large amount of toner such as an untransferred image or a toner whose polarity has changed. It is an object of the present invention to provide a cleaning device that can handle the above.

  For this purpose, a cleaning device to which the present invention is applied is a cleaning device that removes toner on a rotating image carrier, and is disposed facing the image carrier, and the toner on the image carrier. And a second cleaning brush which is disposed opposite to the image carrier and has a smaller diameter than the first cleaning brush.

  Here, the first cleaning brush and the second cleaning brush are charged with opposite polarities. The second cleaning brush is provided downstream of the first cleaning brush in the rotation direction of the image carrier. Further, the first cleaning brush is charged with a polarity opposite to the charging polarity of the toner charged in the developing device of the image forming apparatus, and the second cleaning brush is charged with the same polarity as the toner.

  Further, as the image forming apparatus of the present invention, an image carrier that is rotatably provided and carries a toner image, a rotation drive mechanism that rotationally drives the image carrier, and a toner image carried on the image carrier. A transfer unit that transfers the toner to the transfer member, and a cleaning device that is provided downstream of the transfer unit in the moving direction of the image carrier and removes toner remaining on the image carrier after the transfer by the transfer unit. Has two sets of cleaning brushes that are in contact with the image carrier and arranged in parallel in the moving direction of the image carrier, and the cleaning brush on the downstream side in the moving direction of the image carrier is compared with the cleaning brush on the upstream side. And a high mechanical removal force.

  Here, the cleaning brush on the downstream side in the moving direction of the image carrier has a smaller diameter than the cleaning brush on the upstream side. The image carrier has a belt shape, the rotation drive mechanism includes a drive roll member around which the image carrier is wound, and the cleaning device faces a portion of the drive roll member around which the image carrier is wound. Is provided.

  According to the present invention, it is possible to satisfactorily remove a large amount of toner such as an untransferred image remaining on the surface of the image carrier and a toner whose polarity has changed.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram of an image forming apparatus to which the exemplary embodiment is applied. An image forming apparatus 1 shown in the figure is a so-called tandem type color image forming apparatus. For example, a plurality of image forming units 10 (10Y, 10M, 10C, and 10K) that form toner images of the respective color components by an electrophotographic method, and the upper side in the drawing of each image forming unit 10 through a circulation path that goes around each image forming unit And an intermediate transfer belt 20 as an image bearing member. Further, a secondary transfer device 40 that transfers the toner image on the intermediate transfer belt 20 onto a recording paper P as a transfer material, and the intermediate transfer belt after the toner image is transferred to the recording paper P by the secondary transfer device 40. 20 includes a cleaning device 50 for cleaning the surface of 20 and a fixing device 60 for fixing a toner image on the recording paper P. The embodiment of the present invention is applied to the cleaning device 50, which will be described in detail later. Although not shown, the recording paper P accommodated in the tray is transported to the secondary transfer device 40 and is transported from the secondary transfer device 40 to the fixing device 60, and the recording paper P fixed by the fixing device 60 is further transported. A recording paper transport system for transporting to the paper discharge tray is provided.

  Each image forming unit 10 includes a photosensitive drum 11 as an image carrier that rotates in the direction of arrow A in the drawing. Around each photosensitive drum 11, a charger 12 for charging the photosensitive drum 11 along the rotation direction, and a laser exposure device (not shown) for writing an electrostatic latent image on the photosensitive drum 11 are shown. Only the exposure beam is indicated by the symbol Bm), the developing device 14 that visualizes the electrostatic latent image on the photosensitive drum 11 with toner, and the toner image formed on the photosensitive drum 11 as an intermediate transfer belt. An electrophotographic device such as a primary transfer roll 15 for transferring to 20 and a drum cleaner 16 for removing residual toner on the photosensitive drum 11 are sequentially arranged. Each of these image forming units 10 includes an image forming unit 10Y that forms a yellow toner image and an image forming unit 10M that forms a magenta toner image from the upstream side in the moving direction of the intermediate transfer belt 20 indicated by an arrow B in the drawing. The image forming unit 10C for forming a cyan toner image and the image forming unit 10K for forming a black toner image are arranged in parallel in this order. In the present embodiment, toner that is negatively charged is used in forming the toner image of each color component.

The intermediate transfer belt 20 is formed into an endless belt having a thickness of, for example, 0.1 mm and a predetermined width by using a material in which a conductive agent such as carbon black as a conductive agent is contained in a resin such as polyimide. The volume resistivity is set to 10 6 to 10 14 Ω · cm.
And it is wound around a plurality of rolls and is provided so as to be able to go around along a route defined by these rolls. As these rolls, a drive roll 31 of a rotation drive mechanism that is driven by a motor (not shown) to rotate the intermediate transfer belt 20 and several tensions that apply a certain tension to the intermediate transfer belt 20 and define a path. It has a tension roll 32 and a backup roll (support roll) 42 provided at a position for secondary transfer.

  The circulation path of the intermediate transfer belt 20 is horizontal on the lower side corresponding to each image forming unit 10 and is also substantially horizontal on the upper side. The intermediate transfer belt 20 is wound around the drive roll 31 by nearly 180 °, so that the driving force is efficiently transmitted. A cleaning device 50 is disposed at a portion where the intermediate transfer belt 20 is wound around the drive roll 31. The drive roll 31 rotates in the clockwise direction in the drawing, and thereby the intermediate transfer belt 20 is driven to rotate clockwise.

Each primary transfer roll 15 is positioned opposite to the photosensitive drum 11 of each image forming unit 10 with the intermediate transfer belt 20 interposed therebetween. A voltage having a polarity opposite to the charging polarity of the toner (that is, positive polarity in the present embodiment) is applied to these primary transfer rolls 15. Then, the toner image formed on the photosensitive drum 11 by the potential difference is transferred to the intermediate transfer belt 20. This part is a primary transfer part.
A secondary transfer roll 41 is provided at a position facing the backup roll 42 with the intermediate transfer belt 20 in between. The secondary transfer roll 41 and the backup roll 42 constitute a secondary transfer device 40. A voltage having a polarity (positive polarity) opposite to the charging polarity of the toner is applied to the secondary transfer roll 41, whereby the toner image carried by the intermediate transfer belt 20 is transferred to the recording paper P.

The image forming apparatus 1 configured as described above operates as follows to form an image on the recording paper P.
That is, the toner image of each color component formed by each image forming unit 10 is sequentially transferred by the action of the primary transfer roll 15 on the intermediate transfer belt 20 that is rotated (rotated) by the drive roll 31 (primary transfer). Transcript). Then, the superimposed image held on the intermediate transfer belt 20 is collectively transferred (secondary transfer) by the secondary transfer device 40 onto the recording paper P conveyed by the recording paper conveyance system. Thereafter, the image secondarily transferred onto the recording paper P is fixed by the fixing device 60 and discharged.
On the other hand, the portion of the intermediate transfer belt 20 after the toner image carried by the secondary transfer device 40 is transferred to the recording paper P moves to a position corresponding to the cleaning device 50, and the remaining toner is removed.

Next, the cleaning device 50 according to the embodiment of the present invention will be described in detail.
FIG. 2 is a sectional view conceptually showing the cleaning device 50.
The cleaning device 50 includes a first brush cleaning mechanism 51 and a second brush cleaning mechanism 52, and is housed in a housing 53 (only a part is shown in the figure).
The brush cleaning mechanisms 51 and 52 are arranged so as to interfere with the intermediate transfer belt 20 around which the drive roll 31 is wound, and the brushes 51A and 52A serving as cleaning brushes are arranged to interfere with the brushes 51A and 52A. The collection | recovery roll 51B * 52B arrange | positioned is provided. Further, scrapers 51C and 52C are provided which are disposed in contact with the collecting rolls 51B and 52B and scrape off the toner from the collecting rolls 51B and 52B.
The brushes 51A and 52A, the collecting rolls 51B and 52B, and the scrapers 51C and 52C are provided in an array that is slightly raised to the right from the horizontal in the drawing.
The drive roll 31 is grounded, and a potential difference is obtained by applying voltage to the brushes 51A and 52A and the collection rolls 51B and 52B by a bias power source described later. In addition, by arranging the cleaning device 50 so as to face the drive roll 31 as described above, it is not necessary to separately provide a facing member, and space saving and miniaturization are possible.

The brushes 51A and 52A have, for example, nylon piles (hairs) having conductivity set to a predetermined resistance value (for example, volume resistivity of 10 12 Ω · cm) around a metal core shaft having conductivity. ) Are planted at a predetermined density, and the entire shape is formed in a cylindrical shape. Further, it is connected to a motor (not shown) via a linkage mechanism, and is driven to rotate by this motor. The rotation direction is set so as to face the moving direction (clockwise in the drawing) at the contact portion with the intermediate transfer belt 20 around which the drive roll 31 is wound. Further, the rotational speed is set such that the peripheral speed is equal to the peripheral speed of the drive roll 31 (that is, the intermediate transfer belt 20). That is, the intermediate transfer belt 20 moves in the reverse direction at the same peripheral speed.

The collection rolls 51B and 52B are formed of, for example, a stainless alloy or an aluminum alloy, and the surface is coated with an insulating coat. Further, it is connected to a motor (not shown) via a linkage mechanism, and is driven to rotate by this motor. The rotation direction is set to be the same direction (counterclockwise in the figure) at the contact portion with the brush 51A.
The scrapers 51C and 52C are in a thin plate shape and are disposed in contact with the surfaces of the collection rolls 51B and 52B, and scrape off the toner from the surfaces of the collection rolls 51B and 52B.

The first brush cleaning mechanism 51 is disposed on the upstream side in the winding area of the intermediate transfer belt 20 around the drive roll 31 (first quadrant in an orthogonal coordinate system centered on the drive roll 31 in the figure), The second brush cleaning mechanism 52 is disposed on the downstream side thereof (the front side in the moving direction of the intermediate transfer belt 20: the second quadrant). Thereby, the first brush cleaning mechanism 51 and the second brush cleaning mechanism 52 have a double arrangement structure in the vertical direction.
The second brush cleaning mechanism 52 has a more compact configuration as a whole than the first brush cleaning mechanism 51, as will be described later. Accordingly, the position of the scraper 52C at the right end in the drawing is positioned a predetermined amount closer to the drive roll 31 than the scraper 51C of the first brush cleaning mechanism 51. With such an arrangement, the toner collected by the first brush cleaning mechanism 51 (toner scraped off from the collecting roll 51B by the scraper 51C) does not interfere with the second brush cleaning mechanism 52 even if it falls directly below (falling). Path 51D). In addition, the toner collected by the second brush cleaning mechanism 52 (the toner scraped off from the collecting roll 52B by the scraper 52C) falls in a path 52D adjacent to the toner dropping path 51D of the first brush cleaning mechanism 51. This makes it possible to share (unify) the transport path of the collected toner by the first brush cleaning mechanism 51 and the second brush cleaning mechanism 52. That is, even if the first brush cleaning mechanism 51 and the second brush cleaning mechanism 52 are doubled, if the size of both is the same, the toner collected by the first brush cleaning mechanism 51 will not be collected. Since the toner falls on the second brush cleaning mechanism 52, a different toner conveyance path must be formed, but this configuration does not require such a case.

Here, the brush 51 </ b> A of the first brush cleaning mechanism 51 has a longer pile length and a larger diameter than the brush 52 </ b> A of the second brush cleaning mechanism 52. For example, the pile length is set to 4 mm and the outer diameter is set to 14 mm. The intermediate transfer belt 20 is set to nip with the drive roll 31 with a larger amount of interference.
Further, the collection roller 51B of the first brush cleaning mechanism 51 has an outer diameter set equal to that of the brush 51A, and a rotation speed is set in the reverse direction at a peripheral speed equal to that of the brush 51A. In this way, the brush 51A and the recovery roll 51B have the same outer diameter and are configured to rotate in the reverse direction at the same peripheral speed, thereby simplifying the drive mechanism, such as sharing a rotational drive source (motor). it can.
Further, the brush 51A and the collection roll 51B of the first brush cleaning mechanism 51 are connected to bias power sources 51V and 51W, respectively. A positive bias voltage is applied by the bias power sources 51V and 51W to attract the negatively charged toner carried on the intermediate transfer belt 20. The bias voltage is different between the brush 51A and the collecting roll 51B, and a larger bias voltage than the brush 51A is applied to the collecting roll 51B. For example, the potential difference is set to 200 V or more.

  Such a first brush cleaning mechanism 51 uses the brush 51A to remove negatively charged toner remaining on the intermediate transfer belt 20 without being transferred onto the recording paper P in the secondary transfer device 40 (see FIG. 1). It is adsorbed and removed by the electrostatic force. The brush 51A has a large diameter, a wide nip width, and a long pile. Therefore, the contact area of the pile with respect to the toner is large, and each pile touches the intermediate transfer belt 20 for a long time. For this reason, even a large amount of toner such as an untransferred image can be efficiently adsorbed and removed. Further, since the pile length is long and the electrostatic capacity is large, a sufficient electrostatic attraction force can be maintained even for a large amount of toner. Furthermore, the toner collected by the brush 51A is smoothly transferred to the collecting roll 51B by the potential difference due to the difference in bias voltage, thereby maintaining the cleaning ability by the brush 51A.

On the other hand, the brush 52A of the second brush cleaning mechanism 52 has a small pile length and a small diameter. For example, the pile length is set to 2.5 mm and the outer diameter is set to 10 mm.
The collection roll 51B has an outer diameter that is set equal to that of the brush 52A, and a rotational direction that is equal to the circumferential speed of the brush 52A and is set in the reverse direction. In this way, the brush 52A and the recovery roll 52B have the same outer diameter and rotate in the opposite direction at the same peripheral speed, thereby simplifying the drive mechanism, such as sharing a rotational drive source (motor). it can. Further, since the brush 52A and the collection roll 51B have a small diameter, the brush 52A and the collection roll 51B can be configured compactly.
Further, the brush 52A and the collection roll 52B of the second brush cleaning mechanism 52 are connected to bias power sources 52V and 52W, respectively. A negative bias voltage opposite to that of the first brush cleaning mechanism 51 is applied by the bias power supplies 52V and 52W. The bias voltage is different between the brush 52A and the collection roll 52B, and a larger bias voltage than the brush 52A is applied to the collection roll 52B. For example, the potential difference is set to 200 V or more.

Such a second brush cleaning mechanism 52 removes the toner remaining on the intermediate transfer belt 20 left by the first brush cleaning mechanism 51 from the electrostatic attraction force and the brush 51A of the first brush cleaning mechanism 51. Elimination by strong mechanical force. That is, on the intermediate transfer belt 20, toner that has been changed (charged) to a reverse polarity (positive polarity) by discharge in the secondary transfer device 40 (see FIG. 1), and toner that has no polarity and remains negative However, it remains mixed. The positive toner is removed by adsorption with electrostatic force, and the negative toner is mechanically scraped off. Since the pile length is short, the brush 52A has high rigidity, so that the toner on the intermediate transfer belt 20 can be mechanically scraped and removed not only by electrostatic adsorption but also by reverse polarity. Is.
Furthermore, the toner collected by the brush 52A is smoothly transferred to the collecting roll 52B by the potential difference due to the difference in bias voltage, thereby maintaining the cleaning ability by the brush 52A.

FIG. 3 is a conceptual diagram illustrating a difference in action due to a difference in diameter between the brush 51A of the first brush cleaning mechanism 51 and the brush 52A of the second brush cleaning mechanism 52.
In the figure, for easy understanding, the diameters of the core shafts of the brushes 51A and 52A are the same, the distances between the shaft centers of the drive rolls 31 are the same, and only the diameters are changed. Thus, in the brush 51A having a relatively large diameter compared to the brush 52A, the biting amount X1 is large and the nip width W1 is also widened. Therefore, the contact area of the pile with the toner is large, and each pile is in contact with the intermediate transfer belt 20 for a long time. As a result, a large amount of toner can be efficiently removed by electrostatic adsorption. On the other hand, the brush 52A having a relatively small diameter as compared with the brush 51A does not have a strong electrostatic attraction force, but since the pile length is short, the toner can be mechanically removed by the rigidity of the pile. It can be done.

  As described above, in the cleaning device 50 configured as described above, as shown in FIG. 2, the negative polarity toner remaining on the intermediate transfer belt 20 wound around the drive roll 31 is first removed from the first brush. The cleaning mechanism 51 performs adsorption removal with electrostatic force. Then, the positive and negative polarity toner left behind by the first brush cleaning mechanism 51 is adsorbed by the electrostatic force by the second brush cleaning mechanism 52 and scraped off and removed by mechanical force. The brush cleaning mechanisms 51 and 52 transfer the removed toner in the order of the brushes 51A and 52A and the collection rolls 51B and 52B. To do. As a result, a large amount of toner such as an untransferred image remaining on the surface of the intermediate transfer belt 20 and toner having changed polarity can be efficiently removed, and the surface of the intermediate transfer belt 20 can be cleaned well. is there.

In addition, this invention is not limited to the said embodiment. For example, the arrangement positions of the first brush cleaning mechanism 51 and the second brush cleaning mechanism 52 can be changed as appropriate, for example, by arranging them in the reverse direction with respect to the moving direction of the intermediate transfer belt 20.
In the present embodiment, the present invention is applied to a so-called tandem color image forming apparatus. For example, the present invention is applied to a color image forming apparatus using a rotary developing device, a monochrome copying machine, or the like. Needless to say, you can.
The cleaning device for cleaning the intermediate transfer belt has been described as an example. However, the target image carrier is not limited to the intermediate transfer belt, and may be applied to, for example, a device for cleaning a photosensitive drum. .

1 is a schematic configuration diagram of an image forming apparatus to which the exemplary embodiment is applied. It is sectional drawing which shows a cleaning apparatus notionally. It is a conceptual diagram explaining the difference in the effect | action by the difference in the diameter of a brush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus, 20 ... Intermediate transfer belt (image carrier), 31 ... Drive roll (drive roll member), 50 ... Cleaning device, 51 ... First brush cleaning mechanism, 51A ... Brush (first cleaning brush) ), 52 ... second brush cleaning mechanism, 52A ... brush (second cleaning brush), P ... recording paper (transfer material)

Claims (7)

  1. A cleaning device for removing toner on a rotating image carrier,
    A first cleaning brush disposed opposite the image carrier to remove toner on the image carrier;
    A cleaning apparatus, comprising: a second cleaning brush disposed opposite to the image carrier and having a diameter smaller than that of the first cleaning brush.
  2.   The cleaning apparatus according to claim 1, wherein the first cleaning brush and the second cleaning brush are charged with opposite polarities.
  3.   The cleaning apparatus according to claim 2, wherein the second cleaning brush is provided downstream of the first cleaning brush in the rotation direction of the image carrier.
  4.   The first cleaning brush is charged with a polarity opposite to a charging polarity of toner charged in a developing device of the image forming apparatus, and the second cleaning brush is charged with the same polarity as the toner. The cleaning device according to claim 2.
  5. An image carrier that is rotatably provided and carries a toner image;
    A rotational drive mechanism for rotationally driving the image carrier;
    A transfer unit that transfers the toner image carried on the image carrier to a member to be transferred;
    A cleaning device that is provided downstream of the transfer unit in the moving direction of the image carrier and removes toner remaining on the image carrier after transfer by the transfer unit;
    The cleaning device includes:
    Two cleaning brushes arranged in parallel with each other in the moving direction of the image carrier in contact with the image carrier,
    The image forming apparatus according to claim 1, wherein the cleaning brush on the downstream side in the moving direction of the image carrier has a higher mechanical removal force than the cleaning brush on the upstream side.
  6.   The image forming apparatus according to claim 5, wherein the cleaning brush on the downstream side in the moving direction of the image carrier has a smaller diameter than the upstream cleaning brush.
  7. The image carrier is belt-shaped, and the rotational drive mechanism includes a drive roll member around which the image carrier is wound,
    The image forming apparatus according to claim 6, wherein the cleaning device is provided to face a portion of the drive roll member around which the image carrier is wound.
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JP2010134132A (en) * 2008-12-04 2010-06-17 Kyocera Mita Corp Image forming apparatus
JP2011197249A (en) * 2010-03-18 2011-10-06 Ricoh Co Ltd Cleaning device and image forming apparatus
JP2012008486A (en) * 2010-06-28 2012-01-12 Ricoh Co Ltd Cleaning device and image forming apparatus
JP2012037744A (en) * 2010-08-09 2012-02-23 Ricoh Co Ltd Cleaning device, image forming device and assembling method for the same
JP2012078747A (en) * 2010-10-06 2012-04-19 Ricoh Co Ltd Cleaning device and image formation apparatus
US8433213B2 (en) 2010-03-18 2013-04-30 Ricoh Company, Limited Cleaning device and image forming apparatus
US8437657B2 (en) 2009-12-24 2013-05-07 Ricoh Company, Limited Cleaning apparatus and image forming apparatus
US8600256B2 (en) 2010-07-12 2013-12-03 Ricoh Company, Ltd. Cleaning device and image forming apparatus including same
JP2014006289A (en) * 2012-06-21 2014-01-16 Konica Minolta Inc Image forming apparatus, method for controlling image forming apparatus, and control program for image forming apparatus
US8699908B2 (en) 2010-10-22 2014-04-15 Ricoh Company, Ltd. Cleaning device and image forming apparatus including same
US9329533B2 (en) 2014-03-12 2016-05-03 Ricoh Company, Ltd. Cleaning device and image forming apparatus including same
JP2016070944A (en) * 2014-09-26 2016-05-09 キヤノン株式会社 Image forming apparatus

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Cited By (17)

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Publication number Priority date Publication date Assignee Title
JP2010134132A (en) * 2008-12-04 2010-06-17 Kyocera Mita Corp Image forming apparatus
US8437657B2 (en) 2009-12-24 2013-05-07 Ricoh Company, Limited Cleaning apparatus and image forming apparatus
US8433213B2 (en) 2010-03-18 2013-04-30 Ricoh Company, Limited Cleaning device and image forming apparatus
JP2011197249A (en) * 2010-03-18 2011-10-06 Ricoh Co Ltd Cleaning device and image forming apparatus
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JP2012008486A (en) * 2010-06-28 2012-01-12 Ricoh Co Ltd Cleaning device and image forming apparatus
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