JP2008009286A - Cleaning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning device which prevents failures in image by preventing a fluctuation in velocity of an image carrier. <P>SOLUTION: When a gain (amplification gain) in changing frequency of a first brush roll 215 during rotation, when the first brush roll 215 comes in contact with a photoreceptor drum 11 is taken on the ordinate with reference to the resonance frequency of the image forming apparatus 10 as a whole, an area where the gain shows 6 db or higher (double amplification) is regarded as a resonance area, thus, the area with about ±10 Hz around about 60 Hz becomes a resonance area; and when the vibration having the frequencies of, especially, about 60 Hz is input, the input vibration is amplified significantly. By changing the bristle flux arrangement of rub-bristles 211 and setting the frequency during rotation, when the first brush roll 215 comes in contact with the photoreceptor drum 11 so as to be largely deviated from the resonance area of 50 Hz to 70 Hz, the resonance with the image forming apparatus 10 as a whole will not occur; and consequently, the load fluctuations in the photoreceptor drum 11 will not occur, and the occurrence of banding is suppressed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cleaning device, and in particular, in an image forming apparatus such as an electrophotographic copying machine or a laser beam printer, residual toner or paper dust from a surface of a photosensitive drum or an intermediate transfer member after a toner image is transferred to a recording sheet. The present invention relates to a cleaning device for removing water.

  In general, in an image forming apparatus such as an electrophotographic copying machine or a laser beam printer, a toner image is formed on the surface of a photosensitive drum in accordance with image data, and then the toner image is transferred to a recording sheet. A recorded image is obtained by heat-fixing the image on a recording sheet. In recent full-color copying machines and full-color laser beam printers, a toner image formed on a photosensitive drum is primarily transferred to an intermediate transfer member, and four colors of yellow, cyan, magenta, and black are transferred onto the intermediate transfer member. It is also known to form a full-color recording image by superimposing toner images and collectively transferring these synthesized toner images onto a recording sheet.

  The transfer efficiency of the toner image is affected by fluctuations in the resistance value of the recording sheet and the intermediate transfer member due to changes in the surface condition of the photosensitive drum and intermediate transfer member, and temperature / humidity. It is difficult, and the toner remains on the surface of the photosensitive drum or the intermediate transfer member from which the toner image is transferred even after the toner image is transferred. For this reason, conventionally, for image carriers such as a photosensitive drum and an intermediate transfer member, a cleaning device is provided on the downstream side of the transfer portion of the toner image, and the image on the image carrier is formed before the next toner image is formed. Residual toner is removed.

  As such a cleaning device, a device that presses an elastic rubber blade against the surface of a photosensitive drum and removes residual toner by a mechanical force is widely used. Since this blade type cleaning device does not require a drive unit, it has the advantage of being mechanically simple and inexpensive. However, the rubber blade does not remove only the toner, but the image carrier that is the object to be cleaned. Since the surface of the body is also scraped little by little, there is a disadvantage that the life of the photosensitive drum is shortened due to damage to the photosensitive layer of the photosensitive drum. In particular, in recent years, the diameter of the photosensitive drum has been remarkably reduced from the viewpoint of miniaturization, and the number of rotations of the photosensitive drum with respect to the same number of prints tends to increase. End up.

  On the other hand, as a cleaning device other than the blade type, a so-called fur that mechanically removes residual toner by bringing a brush roller planted with innumerable rubbing hairs into contact with an image carrier and rotating the brush roller in an image bearing manner. A brush method is known. Such a brush roller is driven to rotate by a motor, and the toner capture efficiency can be increased by setting a large linear velocity ratio with the image carrier that is the object to be cleaned. This fur brush type cleaning device is less damaging to the image carrier than the above-described blade type, and it can be expected that the life of the photosensitive drum will be extended accordingly.

  By the way, the sliding of the rubbing hairs on the surface of the brush roller becomes a driving load on the image carrier during the printing operation. Normally, this driving load is negligible, but under certain conditions, a serious speed fluctuation is caused to the image carrier, and as a result, horizontal stripes (= banding) may occur in the output image.

  That is, for example, a brush roller that cleans the surface of the photosensitive drum becomes a driving load of the photosensitive drum, and if the rotational speed fluctuation is caused in the photosensitive drum, the image forming speed in the sub-scanning direction becomes unstable at the time of exposure / image transfer, As a result, horizontal streaks consisting of shading unevenness occur in the output image.

  Here, in a process cartridge with a two-frame structure in which the cleaning frame and the development frame are rotatably coupled to one fulcrum, image defects such as pitch unevenness and white banding due to the resonance of the development frame are prevented. The structure which performs is proposed (for example, refer patent document 1).

  In the above example, the cleaning frame that supports the photosensitive drum, the charger, and the cleaning device, and the frame that combines the developing frame that supports the developing unit and the toner frame that has the toner chamber, rotate around the fulcrum. In such a configuration that the two frame members are urged around the fulcrum by an elastic member such as a spring to determine the relative position between the photosensitive drum and the developing unit, the developing unit is brought into pressure contact with the photosensitive drum. By using a vibration damping element in the configuration of the pressurizing means, a process cartridge and an electrophotographic image forming apparatus free from image defects such as pitch unevenness and banding are obtained.

  However, with respect to an image failure caused by the speed fluctuation exerted on the image carrier by the brush roller for cleaning the image carrier, which is a problem in the present invention, the rubbing hair on the surface of the brush roller acts as an elastic body between the image carrier and the image carrier. Because of this, the above method cannot be applied directly.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a cleaning device that prevents fluctuations in the speed of an image carrier and prevents image failure.
JP 2000-293086 A

  In view of the above facts, an object of the present invention is to provide a cleaning device that prevents fluctuations in the speed of an image carrier and prevents image failure.

  The cleaning device according to claim 1 is provided in an image forming apparatus for transferring and fixing a toner image formed on an image carrier onto a sheet, and an image is formed by a brush roller in which a plurality of rubbing hairs stand from a rotation shaft. A cleaning device that rubs the surface of the carrier and removes toner from the surface, wherein a frequency at which the brush roller contacts and vibrates the image carrier is 90% or less of a resonance frequency of the image forming device. Alternatively, the frequency is 110% or more.

  In the invention having the above-described configuration, the frequency at which the brush roller vibrates the image carrier is set so as not to overlap the resonance frequency of the entire apparatus, thereby suppressing the vibration of the image carrier and preventing the occurrence of image failure.

  The cleaning device according to claim 2 is provided in an image forming apparatus that transfers and fixes a toner image formed on an image carrier onto a sheet, and an image is formed by a brush roller in which a plurality of rubbing hairs stand from a rotation shaft. A cleaning device for rubbing the surface of a carrier and removing toner from the surface, wherein the flocking intervals of the rubbing hairs are irregular.

  In the invention with the above configuration, the frequency at which the brush roller vibrates the image carrier is set to be random as irregular flocking intervals, thereby suppressing the vibration of the image carrier and preventing the occurrence of image failure. .

  Since the present invention has the above-described configuration, it was possible to provide a cleaning device that prevents fluctuations in the speed of the image carrier and prevents image failure.

<Basic configuration>
FIG. 1 shows an image forming apparatus according to a first embodiment of the present invention.

  FIG. 1 shows a full-color laser beam printer equipped with the cleaning device of the present invention. In addition, the arrow in FIG. 1 has shown the rotation direction of each rotation member.

  As shown in FIG. 1, the image forming apparatus 10 includes image forming drums 11C, 11M, 11Y, and 11K for cyan (C), magenta (M), yellow (Y), and black (K). Units 1, 2, 3, 4; charging rolls 21, 22, 23, and 24 for primary charging that contact these photosensitive drums 11C, 11M, 11Y, and 11K; cyan (C), magenta (M), and yellow A laser optical unit (not shown) that irradiates laser beams 31, 32, 33, and 34 of each color (Y) and black (K), developing devices 41, 42, 43, and 44, and the four photosensitive drums 11C and 11M. , 11Y, 11K, the first primary intermediate transfer drum 51 in contact with the two photosensitive drums 11, 12 and the second primary intermediate transfer drum in contact with the other two photosensitive drums 13, 14. The main part of the second intermediate transfer drum 53 in contact with the first intermediate transfer drum 51 and the second intermediate transfer drum 53 in contact with the first intermediate transfer drum 51 and the second intermediate transfer drum 53. It is configured.

  The photoconductive drums 11C, 11M, 11Y, and 11K are arranged at regular intervals so as to have a common tangential plane M. Further, the first primary intermediate transfer drum 51 and the second primary intermediate transfer drum 52 are surfaces whose respective rotation axes are parallel to the photosensitive drums 11C, 11M, 11Y, and 11K and have predetermined target surfaces as boundaries. Arranged so as to be in a target relationship. Further, the secondary intermediate transfer drum 53 is arranged so that the rotation axis thereof is parallel to the photosensitive drums 11C, 11M, 11Y, and 11K.

  Signals corresponding to image information for each color are rasterized by an image processing unit (not shown) and input to a laser optical unit (not shown). In this laser optical unit, the laser beams 31, 32, 33, and 34 of cyan (C), magenta (M), yellow (Y), and black (K) are modulated, and the corresponding photosensitive drum 11C, 11M, 11Y, and 11K are irradiated.

  Around each of the photosensitive drums 11C, 11M, 11Y, and 11K, an image forming process for each color is performed by a known electrophotographic method. First, as the photoconductor drums 11C, 11M, 11Y, and 11K, photoconductor drums using an OPC photoconductor having a diameter of 20 mm are used. These photoconductor drums 11C, 11M, 11Y, and 11K have a rotational speed of 95 mm / second. Is driven to rotate. As shown in FIG. 1, the surfaces of the photosensitive drums 11C, 11M, 11Y, and 11K are applied with a DC voltage of about −800V to the charging rolls 12, 22, 32, and 42, for example, about −300V. Are uniformly charged. In this embodiment, only the DC component is applied to the charging roll, but the AC component may be superposed on the DC component.

  In this way, the surfaces of the photosensitive drums 11C, 11M, 11Y, and 11K having a uniform surface potential are cyan (C), magenta (M), yellow (Y), and yellow by a laser optical unit as an exposure apparatus. Laser light 31, 32, 33, 34 corresponding to each color of black (K) is irradiated, and an electrostatic latent image corresponding to input image information for each color is formed. When the electrostatic latent image is written by the laser optical unit, the surface potential of the image exposure portion on the photosensitive drums 11C, 11M, 11Y, and 11K is neutralized to about −60V or less.

  The electrostatic latent images corresponding to the respective colors of cyan (C), magenta (M), yellow (Y), and black (K) formed on the surfaces of the photosensitive drums 11C, 11M, 11Y, and 11K are compatible. Are developed by the developing devices 41, 42, 43, and 44, and cyan (C), magenta (M), yellow (Y), and black (K) colors on the photosensitive drums 11C, 11M, 11Y, and 11K. Visualized as a toner image. Each of the developing devices 41, 42, 43, and 44 is filled with a developer composed of cyan (C), magenta (M), yellow (Y), and black (K) toners and carriers of different colors. Yes.

When toner is supplied from a toner replenishing device (not shown), these replenishing devices 41, 42, 43, and 44 are sufficiently agitated with the carrier by the auger 404 and frictionally charged. Inside the developing roll 401, a magnet roll (not shown) having a plurality of magnetic poles arranged at a predetermined angle is fixed. By the paddle 403 that conveys the developer to the developing roll 401, the amount of the developer conveyed to the vicinity of the surface of the developing roll 401 is regulated by the developer amount regulating member 402. In this embodiment, the amount of the developer is 30 to 50 g / m ² , and the charge amount of the toner existing on the developing roll 401 at this time is approximately about −20 to −35 μC / g.

  The toner supplied onto the developing roll 401 is in the form of a magnetic brush composed of a carrier and toner by the magnetic force of the magnet roll, and this magnetic brush comes into contact with the photosensitive drums 11C, 11M, 11Y, and 11K. ing. A developing bias voltage of AC + DC is applied to the developing roll 401, and the toner on the developing roll 401 is developed into an electrostatic latent image formed on the photosensitive drums 11C, 11M, 11Y, and 11K, whereby a toner image is formed. It is formed. In this embodiment, the developing bias voltage is about 4 kHz for AC, 1.5 kVpp, and about −230 V for DC.

  Next, the toner images of the respective colors of cyan (C), magenta (M), yellow (Y), and black (K) formed on the photosensitive drums 11C, 11M, 11Y, and 11K are the first primary images. The primary transfer is electrostatically performed on the intermediate transfer drum 51 and the second primary intermediate transfer drum 52. Cyan (C) and magenta (M) color toner images formed on the photoconductive drums 11C and 11M are formed on the first primary intermediate transfer drum 51 and yellow (on the photoconductive drums 13 and 14, respectively). The toner images of Y) and black (K) are transferred onto the second primary intermediate transfer drum 52, respectively. Accordingly, on the first primary intermediate transfer drum 51, the single-color image transferred from either the photosensitive drum 11C or 11M and the two-color toner images transferred from both the photosensitive drums 11Y and 11M are superimposed. A double color image is formed. In addition, similar single-color images and double-color images are formed on the second primary intermediate transfer drum 52 from the photosensitive drums 11Y and 11K.

  The surface potential necessary for electrostatically transferring the toner images from the photosensitive drums 11C, 11M, 11Y, and 11K onto the first and second primary intermediate transfer drums 51 and 52 is about +250 to 500V. . The optimum surface potential varies depending on the charged state of the toner, the ambient temperature, and the humidity. However, if the charged amount of the toner is in the range of -20 to -35 μC / g and is in a normal temperature and humidity environment, the first surface potential is the first. The surface potential of the second primary intermediate transfer drums 51 and 52 is preferably about + 380V. The first and second primary intermediate transfer drums 51 and 52 are set to have an outer diameter of 42 mm and a resistance value of about 10 @ 8 .OMEGA., And a metal pipe made of Fe, Al or the like is made of a low resistance such as conductive silicone rubber. It is formed by covering with an elastic layer (R = 10 ^ 2 to 10 ^ 3Ω). Further, a fluorine rubber layer having a thickness of 3 to 100 μm is provided as a high release layer on the surface of the low resistance elastic layer, and is bonded with a silane coupling agent based adhesive (primer). The resistance value of the high release layer is about R = 10 ^ 5 to 10 ^ 9Ω.

  Thereafter, the single-color or double-color toner images formed on the first and second primary intermediate transfer drums 51 and 52 are electrostatically secondary-transferred onto the secondary intermediate transfer drum 53. Accordingly, a final toner image from a single color image to a quadruple color image of cyan (C), magenta (M), yellow (Y), and black (K) is formed on the secondary intermediate transfer drum 53. Will be.

  The surface potential necessary for electrostatically transferring the toner image from the first and second primary intermediate transfer drums 51 and 52 onto the secondary intermediate transfer drum 53 is about +600 to 1200V. The optimum surface potential varies depending on the charged state of the toner, the ambient temperature, and the humidity as in the case of primary transfer. Further, since what is necessary for the transfer is a potential difference between the first and second primary intermediate transfer drums 51 and 52 and the secondary intermediate transfer drum 53, the first and second primary intermediate transfer drums 51 and 52 have different potentials. It is necessary to set the value according to the surface potential. As described above, the toner charge amount is in the range of −20 to −35 μC / g, and the surface potential of the first and second primary intermediate transfer drums 51 and 52 is +380 V in a normal temperature and humidity environment. The surface potential of the secondary intermediate transfer drum 53 is about +880 V, that is, the potential difference between the first and second primary intermediate transfer drums 51 and 52 and the secondary intermediate transfer drum 53 is about +500 V. It is desirable to set to.

  The secondary intermediate transfer drum 53 used in this embodiment has an outer diameter of 42 mm, which is the same as the first and second primary intermediate transfer drums 51 and 52, and has a resistance value of about 10 ^ 11Ω. Similarly to the primary intermediate transfer drum 53, the secondary intermediate transfer drum 53 is made of a metal pipe made of Fe, Al or the like and a low resistance elastic layer (R = 10) made of conductive silicone rubber or the like having a thickness of about 0.1 to 10 mm. The surface of the low resistance elastic layer is covered with a high release layer made of fluororubber having a thickness of 3 to 100 μm. Here, the resistance value of the secondary intermediate transfer drum 53 needs to be set higher than that of the first and second primary intermediate transfer drums 51 and 52. Otherwise, the secondary intermediate transfer drum 53 charges the first and second primary intermediate transfer drums 51 and 52, and it is difficult to control the surface potential of the first and second primary intermediate transfer drums 51 and 52. Become.

Finally, the final toner image from the single color image to the quadruple color image formed on the secondary intermediate transfer drum 53 is tertiary-transferred onto the paper passing through the paper conveyance path P by the final transfer roll 60. The paper passes through a paper transporting roll 90 through a paper feeding process (not shown), and is fed into the nip portion between the secondary intermediate transfer drum 53 and the final transfer roll 60. After this final transfer step, the final toner image formed on the paper is fixed by the fixing device 70, and a series of image forming processes is completed.
<Cleaning device>
FIG. 2 shows a cleaning device according to the present invention.

  In the laser beam printer of the present invention, a cleaning device is disposed for each of the photosensitive drums 11C, 11M, 11Y, and 11K and the primary intermediate transfer drums 51 and 52.

  First, the cleaning device arranged with respect to the photosensitive drums 11C to 11K is a first brush roll 215 in which conductive rubbing bristles 211 stand around a shaft 212 that is a metal rotating shaft. In order to prevent the toner from adhering to the photosensitive drum 11, the photosensitive drums 11 </ b> C to 11 </ b> K are positioned on the upstream side of the charging roll 21 in the rotation direction. Further, a cleaning bias is applied to the first brush roll 215, and the toner whose polarity is reversed at each transfer portion is temporarily collected from the surface of the photosensitive drum 11 until a cleaning mode described later is started. During this time, the toner is held.

  In FIG. 2, the rubbing bristles 211 are brushed in a substantially tangential direction from the surface of the shaft 212, but the present invention is not limited to this, and there is no problem even if they are brushed substantially radially from the surface of the shaft 212. .

  The toner is charged to (−) polarity in the developing device 41, and the toner image is transferred toward a higher potential in each transfer process. However, when such a toner image repeatedly passes through the transfer part of each transfer process, a part of the (−) charged toner is inverted to the opposite polarity, that is, charged to the (+) polarity by Paschen discharge or charge injection. In this case, the toner whose polarity is reversed in this way is not transferred to the next process but flows backward to the upstream side. Finally, it is transferred to the photosensitive drum 11 and eventually adhered to the charging roll 21.

  The first brush roll 215 is provided to catch the toner whose polarity is reversed in front of the charging roll 21 and prevent the toner from adhering to the charging roll 21. Therefore, at the time of forming a toner image, −400 V, which is lower than the surface potential of the photosensitive drum 11 −300 V, is applied to the first brush roll 215.

Furthermore, second brush rolls 220 and 221 are provided that rotate at a surface speed ratio of about 1.5 times with respect to the primary intermediate transfer drums 51 and 52 and clean residual toner on the primary intermediate transfer drums 51 and 52. Similarly, the secondary intermediate transfer drum 53 is provided with a third brush roll 230.
<Brush roll>
FIG. 4 shows a brush roll of the cleaning device according to the present invention.

  FIG. 4A shows an example of a hair bundle arrangement of the rubbing bristles 211 provided on the surface of the first brush roll 215. When hair bundles (black circles in the figure) of the rubbing bristles 211 formed on the flocking tape 213 are arranged as shown in FIG. 4 (A), the shaft 212 has a predetermined angle as shown in FIG. 4 (B). A flocking tape 213 is wound around to form a brush roll 215.

  As a result, as shown in FIG. 4C, a brush roll 215 in which hair bundles (black circles in the figure) are arranged on the shaft 212 at a predetermined angle is obtained. In this case, an array of seven hair bundles per rotation of the brush roll 215 is obtained.

For the brush roll having the arrangement as described above, when the rotation frequency at which the hair bundle hits the photosensitive drum 11 at an arbitrary axial position is calculated, the rotational speed of the photosensitive drum 11 is 5.12 Hz, and the first brush roll 215 is rotated. When the rotational frequency is 1.5 and the number of bristles in the rotational direction per rotation of the first brush roll 215 at an arbitrary axis position is 7,
5.12 (Hz) × 1.5 × 7 = 54 (Hz)
It becomes.

  The load fluctuation of the image carrier due to the contact of the hair bundle of the brush roll is not a big problem by itself. However, as shown in FIG. 6, the gain (amplification gain) when the rotation frequency when the first brush roll 215 hits the photosensitive drum 11 is changed with respect to the resonance frequency of the entire image forming apparatus 10 in this embodiment. If the vertical axis represents the region where the gain is 6 dB (double amplification) or more, the resonance region is about ± 10 Hz centered on about 60 Hz, and in particular, vibration having a frequency around 60 Hz was input. In some cases, the input vibration is greatly amplified (7 times at 62 Hz).

  In the image forming apparatus 10 according to the present invention, the vibration of 54 Hz caused by the first brush roll is amplified to cause a load fluctuation of the photosensitive drum 11 because it is in a resonance region, and as a result, banding may be deteriorated.

  In order to solve the above problem, it is necessary to control the physical properties of the first brush roll 215 so that the rotation frequency when the first brush roll 215 hits the photosensitive drum 11 does not overlap the resonance frequency of the entire image forming apparatus 10. There is. For this purpose, for example, a method of changing the frequency by changing the hair bundle arrangement of the rubbing bristles 211 can be considered.

  FIG. 5 shows another example of the hair bundle arrangement of the rubbing hairs on the surface of the first brush roll.

  When the bristles (black circles in the figure) of the rubbing bristles 211 formed on the flocking tape 213 are arranged according to the angle wound around the shaft 212 as shown in FIG. 5A, as shown in FIG. 5B. A flocking tape 213 is wound around the shaft 212 at a predetermined angle to form a brush roll 215.

  As a result, as shown in FIG. 5C, a brush roll 215 in which hair bundles (black circles in the drawing) are densely arranged in the circumferential direction on the shaft 212 at a predetermined angle is obtained. In this case, an arrangement of 24 hair bundles per rotation of the brush roll 215 is obtained.

For the brush roll having the rubbing bristles arrangement as described above, the rotation frequency at which the bunch hits the photosensitive drum 11 at an arbitrary axial position is calculated, and the rotational speed of the photosensitive drum 11 is 5.12 Hz. When the first brush roll rotation frequency is 1.5 and the number of bristles in the rotational direction per rotation of the first brush roll 215 at an arbitrary axis position is 24,
5.12 (Hz) × 1.5 × 24 = 184 (Hz)
Thus, it can be set in a region greatly deviating from the resonance range of 50 Hz to 70 Hz. As a result, it is possible to suppress the occurrence of banding without causing resonance with the entire image forming apparatus 10 and as a result without causing load fluctuation of the photosensitive drum 11.
<Rotation speed control of brush roll>
In addition to the method using gears, the driving means for each of the brush rolls can also have a speed ratio while being driven by adjusting the direction of flocking of the brush.

  That is, as shown in FIG. 3A, when the rubbing bristles 211 provided on the surface of the first brush roll 215 are planted on the shaft 212 in a direction opposite to the rotation direction of the photosensitive drum 11, the first brush The rotation speed of the roll 215 is faster than the rotation speed obtained from the ratio of the diameter to the photosensitive drum 11. That is, the first brush roll 215 is driven by the photosensitive drum 11 but rotates faster.

  On the other hand, when the rubbing bristles 211 provided on the surface of the first brush roll 215 are planted on the shaft 212 in a direction according to the rotation direction of the photoconductor drum 11, the rotation speed of the first brush roll 215 is the photoconductor. It becomes slower than the rotational speed obtained from the ratio of the diameter with the drum 11. That is, the first brush roll 215 is driven by the photosensitive drum 11 but rotates more slowly.

By adjusting the rotational speed of the first brush roll 215 as described above and bringing it into contact with the photosensitive drum 11, the first brush roll rotational frequency is controlled, and the first brush roll 215 at an arbitrary axial position, The rotation frequency at which the hair bundle strikes the photosensitive drum 11 can be set to a value that deviates from the resonance frequency of the entire image forming apparatus 10.
<Other methods>
In the embodiment, the flocking direction and the hair bundle arrangement of the first brush roll 215 are changed so that the rotation frequency when the first brush roll 215 hits the photosensitive drum 11 does not overlap the resonance frequency of the entire image forming apparatus 10. By controlling, the load fluctuation of the photosensitive drum 11 is suppressed, but the present invention is not limited to this, and the rotation frequency may be controlled by other methods.

For example, the number of bristles in the rotational direction per rotation of the first brush roll 215 may be controlled by changing the winding angle of the flocking tape 213 around the shaft 212.
<Others>
As mentioned above, although the Example of this invention was described, it cannot be overemphasized that this invention is not limited to said Example at all, and can implement in a various aspect in the range which does not deviate from the summary of this invention.

  That is, in this embodiment, the brush roll cleaner that contacts and follows the photosensitive drum of the image forming apparatus and cleans it is not limited to this, but the image carrier may be in the form of an intermediate transfer belt, Needless to say, a brush-shaped member may be applied to applications such as coating and polishing.

1 is a diagram illustrating an image forming apparatus according to the present invention. It is a schematic diagram which shows the cleaning apparatus which concerns on this invention. It is a schematic diagram which shows the cleaning apparatus which concerns on this invention. It is a figure which shows the flocking state of the conventional brush roll. It is a figure which shows the flocked state of the brush roll which concerns on this invention. It is a figure which shows the resonant frequency of the image forming apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Image forming apparatus 11 Photosensitive drum 211 Rub bristles 212 Shaft 215 1st brush roll

Claims (2)

Provided in an image forming apparatus for transferring and fixing a toner image formed on an image carrier onto paper;
A cleaning device that rubs the surface of the image carrier with a brush roller in which a plurality of rubbing hairs stand up from a rotating shaft and removes toner from the surface,
The cleaning device is characterized in that a frequency at which the brush roller contacts and vibrates the image carrier is 90% or less or 110% or more of a resonance frequency of the image forming apparatus. Provided in an image forming apparatus for transferring and fixing a toner image formed on an image carrier onto paper;
A cleaning device that rubs the surface of the image carrier with a brush roller in which a plurality of rubbing hairs stand up from a rotating shaft and removes toner from the surface,
A cleaning device characterized in that the flocking interval of the rubbing bristles is irregular.

Images