JP2011128363A - Filming removing apparatus and image forming apparatus having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filming removing apparatus which can further prevent the formation of filming on an image carrier, and to provide an image forming apparatus having the filming removing apparatus. <P>SOLUTION: The filming removing apparatus 7 uses a photoreceptor 1 or a transfer belt of the image forming apparatus as the image carrier and removes a filming substance on the image carrier. The filming removing apparatus 7 has a filming removing member 71 that rotates while abutting on the image carrier, and a collecting member 72 that rotates by contacting with the filming removing member, and collects the adherent material of the image carrier which is removed by the filming removing member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image forming apparatus such as a copying machine, a printer, and a facsimile, and more particularly to a technique for removing filming of residual toner on an image carrier.

In an electrophotographic image forming apparatus, the image is permanently transferred onto the transfer paper by transferring the toner image onto the transfer paper as a transfer medium from the photosensitive member and fixing the toner image transferred on the transfer paper by heating and pressing with a fixing device. To be established. Alternatively, after the toner image formed on the above-described photosensitive member is transferred onto the intermediate transfer member, the toner image is transferred from the intermediate transfer member to the transfer paper as the transfer medium, and the transferred toner image on the transfer paper is fixed by the fixing device in the same manner as described above. As a result, the image is permanently fixed on the transfer paper.
For example, when an endless belt is used as an intermediate transfer member, a color toner image is repeatedly formed on the intermediate transfer member, and a small amount of toner remaining on the intermediate transfer member after transfer is removed by a cleaning device. It is like that. The cleaning device generally includes a cleaning blade and a cleaning roller.

However, if fine toner or toner wax dissolved by heat or pressure adheres to the image carrier such as the photosensitive drum or intermediate transfer member, the adhered matter can be removed with a blade or roller in the blade cleaning method. However, there is a problem that a filming substance is gradually formed on the image carrier, and a white portion is formed on the image.
Further, when control is performed by a sensor that irradiates a photosensitive drum or an intermediate transfer member with a laser and receives reflected light, the reflectance gradually changes depending on the filming material on the surface, and proper control cannot be performed.

  In order to solve these problems, it is also possible to remove the filming substance using a brush member. Since the brush member is always in contact with the photosensitive drum and the intermediate transfer member, not only the transfer residual toner on the photosensitive drum or the intermediate transfer member can be removed, but also the surface of the photosensitive drum or the intermediate transfer member can be polished. it can.

  However, if the deposits on the image carrier such as the photoconductor are continuously removed by the brush member, the photoconductor drum or the intermediate transfer body (hereinafter, the photoconductor or the intermediate transfer body is referred to as the image carrier in the present specification). The polishing function of the At the same time, the amount of toner adhering to the brush member gradually increases over time, and if the adsorption capacity of the brush member is exceeded, the image carrier may be contaminated and filming may be accelerated.

In order to solve such a problem of filming, for example, Patent Document 1 has a filming removal mode for removing filming on the surface of the photoreceptor, and the filming removal mode has a plurality of photosensitive member linear speeds. An image forming apparatus according to the present invention is disclosed that is selected according to the above. This document also discloses a technique for preventing filming by applying a lubricant with a brush roller in order to prevent filming.
Moreover, the invention which prevents the filming of patent documents 2-3 by the present applicant is also known.

  According to the inventions of Patent Documents 1 to 3 described above, an image forming apparatus having an effect of removing filming on the surface of a photoreceptor is provided. The present invention further provides a filming removal apparatus capable of further enhancing the effects obtained by the inventions of Patent Documents 1 to 3 described above and suppressing the occurrence of filming over time, and an image forming apparatus having the apparatus. For the purpose.

The present invention has the following problem solving means.
(1) A filming removal device for removing a filming substance on the image carrier using the photosensitive member or transfer belt of the image forming apparatus as an image carrier, the filming removal device being attached to the image carrier. A filming removing member that rotates while abutting, and a recovery member that rotates and collects deposits of the image carrier removed by the filming removing member while contacting the filming removing member. And
(2) In the filming removal apparatus according to (1), the filming removal member removes the deposit on the filming removal member by the recovery member before removing the deposit on the image carrier. The filming material on the image carrier is removed after the filming removal mode to be collected is executed and the removal of the deposit is confirmed.
(3) In the filming removal apparatus according to (1) or (2), the filming removal member is based on brush hairs of low resistance fibers having a brush fiber resistance of 10 ⁵ to 10 ¹⁰ (Ω · cm). The brush member planted on the cloth is wound around a spiral around a metal core, and a voltage is applied.
(4) In the filming removal apparatus according to (3), the recovery member is a roller member made of an elastic body, and a voltage is applied to a core metal of the roller member, and the voltage value is applied to the filming removal member. The applied voltage is equal in polarity and has a large absolute value.
(5) In the filming removal apparatus according to any one of (1) to (4), a blade that is further in contact with a moving direction of the image carrier in a counter direction is more than the image removal member. It is provided on the downstream side with respect to the carrier.
(6) An image forming apparatus including the filming removal device according to any one of (1) to (5), wherein the filming removal member carries an image bearing member or a transfer belt of the image forming device. The image carrier is rotated in the counter direction with respect to the moving direction of the image carrier.
(7) In the image forming apparatus according to (6), a filming removal mode in which the deposit on the film removal member is collected by the collection member before removing the deposit on the image carrier. It is characterized by controlling to execute.

  According to the present invention, it is possible to provide a filming removing apparatus that can further prevent filming from being formed on an image carrier and an image forming apparatus having this apparatus.

2A and 2B are diagrams illustrating a configuration of a main part of an image forming apparatus having a filming removing apparatus according to the present invention, in which FIG. 1A illustrates a case where a system for directly transferring a toner image to a transfer material 19 is employed, and FIG. A case where a system for transferring a toner image to the body 15 is employed is shown. It is a principal part enlarged view of the filming removal apparatus 7 of this invention. It is a figure which shows the principal part structure of the color image forming apparatus which has a filming removal apparatus of this invention.

Hereinafter, electrophotographic image forming apparatuses such as a color printer and a copying apparatus will be described with reference to embodiments.
FIG. 1 is a diagram showing a main configuration of an image forming apparatus having a filming removal apparatus 7 according to the present invention.
As shown in FIG. 1, the image forming apparatus of the present invention includes a photosensitive drum 1 as an image carrier and a filming removal device 7.
In the photosensitive drum 1, a photosensitive layer such as an organic photosensitive member is formed on the outer peripheral surface of an aluminum substrate, and the surface layer of the photosensitive drum 1 is formed of, for example, polycarbonate.

  In the image forming apparatus of the present invention shown in FIG. 1, (A) shows a case where a system for directly transferring a toner image to the transfer material 19 is adopted. In the case of the method shown in FIG. 1A, a toner image formed by development on the photosensitive drum 1 is conveyed in the direction of the arrow in the drawing by the transfer member 13 without using the intermediate transfer member 15. Transfer directly onto a transfer material 19 such as sheet-like paper. The transfer member 13 brings a transfer roller or the like into contact with the surface of the photosensitive drum 1 with a predetermined pressing force, and forms a transfer nip between the transfer member 13 and the photosensitive drum 1. A transfer bias having a polarity opposite to that of the toner is applied to the transfer member 13 from a transfer bias power source (not shown) with the transfer material 19 sandwiched in the transfer nip. The toner image on the photosensitive drum 1 is transferred onto the transfer material 19 by the transfer electric field formed thereby.

  FIG. 1B shows a case where an intermediate transfer method for transferring a toner image to the intermediate transfer member 15 is employed. In the case of the intermediate transfer system shown in FIG. 1 (B), without transferring directly to the transfer material 19, the toner images are transferred to the intermediate transfer belt 15 that performs transfer to the transfer material 19 in a lump after overlapping a plurality of toner images, Thereafter, as shown in FIG. 3, the image is transferred to the transfer material 19 by the transfer member 18.

  As shown in FIG. 1, a charging device 2, an exposure device 3, a developing device 4, a filming removal device 7, and a charge removal device 8 are disposed around the photosensitive drum 1. The charging device 2 has a function of uniformly charging the surface of the photosensitive drum 1. The exposure device 3 has a function of irradiating the uniformly charged photosensitive drum 1 with light to form a latent image. The developing device 4 has a function of developing the photosensitive drum 1 on which the latent image is formed using toner. The transfer roller 17 has a function of primarily transferring the toner image formed by being developed by the developing device to the transfer belt 15. The static eliminator 8 has a function of neutralizing residual charges on the surface of the photosensitive drum 1 in preparation for the next image formation.

The image forming apparatus according to the present invention includes a filming removal device 7 that removes residual toner from the photosensitive drum 1 and removes a filming substance.
Such a filming removal apparatus 7 of the present invention will be described later.

  In the configuration of the image forming apparatus of the present invention shown in FIG. 1, the toner image formed on the photoreceptor 1 is transferred to a transfer material (recording paper) 19 via a transfer device or directly, and the transfer image having this transferred image. The material 19 is provided with a fixing device (not shown) as a fixing unit for fixing the toner image on the recording material 19 on the downstream side.

  A charging device 2 used in the image forming apparatus shown in FIG. 1 uniformly charges the surface of the photosensitive drum 1. In the charging device 2, a charging member is placed in contact with the surface of the photosensitive drum 1, or a small gap is provided from the surface of the photosensitive drum 1 to apply a charging bias. As a result, the surface of the photosensitive drum 1 is uniformly charged to a desired polarity and a desired potential. As this charging member, for example, a charging roller made of an elastic body, a scorotron charger using a wire electrode and a grid electrode, or the like can be used.

  The exposure device 3 forms an electrostatic latent image corresponding to image data on the surface of the photosensitive drum 1 charged by the charging device 2. The exposure apparatus 3 uses, for example, an LD (Laser Diode) or an LED (Light Emitting Diode) as a light emitting element, and irradiates the surface of the uniformly charged photosensitive drum 1 with light based on image data. It forms a latent image. As a result, an electrostatic latent image based on the image data is formed on the surface of the photosensitive drum 1. The exposure apparatus 3 is not limited to such a configuration, and a known apparatus can be used.

  The developing device 4 performs development by attaching toner to the electrostatic latent image formed on the surface of the photosensitive drum 1. The developing device 4 includes a developing roller 41 as a developer carrying member having a magnet roller as a magnetic field generating means arranged in a fixed manner. The developing roller 41 rotates while carrying the developer d on the surface thereof, thereby conveying the developer d to a developing area facing the photosensitive drum 1. For example, in the present invention, a two-component developer composed of a toner and a carrier is used as a developer, and the carrier is so-called “raised” by the magnetic force of a magnet roller so that the toner of the two-component developer is charged by friction or the like. A magnetic brush development method is used in which development is performed in a state. As the developer d, a one-component developer composed only of toner without using a carrier may be used. A developing bias is applied to the developing roller 41 from a developing bias power source. As a result, a potential difference is generated between the potential on the surface of the developing roller 41 and the potential on the electrostatic latent image portion on the surface of the photosensitive drum 1 in the developing region. The toner in the agent adheres to the electrostatic latent image. As a result, the electrostatic latent image on the photosensitive drum 1 becomes a toner image. The developing device 4 is not limited to such a configuration, and a known device can be used.

  The static eliminator 8 removes residual charges on the surface of the photosensitive drum 1. By removing the residual charge, the surface of the photosensitive drum 1 is prepared for the next image formation. In addition, although this static elimination apparatus 7 employ | adopts the optical static elimination system using LED etc., it is not restricted to this.

  In the configuration of the image forming apparatus of the present invention shown in FIG. 1, the toner image formed on the photoreceptor 1 is directly transferred to a transfer material (recording paper) 19 as shown in FIG. As shown in FIG. 1B, after being transferred to the transfer material 19 via the intermediate transfer member 15, the transfer material 19 having this transfer image is fixed to fix the toner image on the transfer material 19 downstream thereof. The image is fixed on the transfer material 19 by a fixing device (not shown) as a means. The transferred transfer material 19 is discharged out of the image forming apparatus.

Next, the filming removal apparatus provided in the image forming apparatus of the present invention will be described with reference to the drawings.
[Filming removal device 7]
The filming removing device 7 of the present invention removes transfer residual toner and the like remaining on the surface of the photosensitive drum 1 without being transferred from the surface of the photosensitive drum 1. The filming removing device 7 of the present invention has a blade member 6 for scraping and removing the transfer residual toner on the surface of the photosensitive drum 1. The blade member 6 is obtained by attaching a polyurethane blade to a metal support. The blade member 6 can be installed so as to be in contact with the rotation direction A of the photosensitive drum 1 in the counter direction.

FIG. 2 is an enlarged view of the filming removal apparatus 7 of the present invention.
The filming removal device 7 of the present invention is configured to remove a filming removal member 71 that rotates while contacting the photoreceptor 1 as an image carrier, and an image carrier removed by the filming removal member 71. A recovery member that rotates and recovers in contact with the ming removal member 71 is provided.

  An example of the filming removal member 71 is a brush member 71, and the recovery member 72 rotates while contacting the brush member 71. Further, the filming removal apparatus 7 of the present invention is configured by arranging a scraper 74 so as to contact the recovery member 72. Further, a brush member power source 75 and a recovery member power source 76 are connected to the brush member 71 and the recovery member 72 so that a voltage can be applied. Further, a discharge member 77 is disposed inside the filming removal apparatus 7 of the present invention in order to discharge the accumulated toner and impurities.

As shown in FIG. 2 or FIG. 3, the brush member 71 has a function of removing filming substances adhering to the surface of the photosensitive drum 1 or the intermediate transfer member 15 as an image carrier and simultaneously removing transfer residual toner. ing.
The brush member 71 is formed by winding a brush in which a bristle having a length of 0.2 to 20 mm, preferably 0.5 to 10 mm, is planted on a base fabric and wound around a metal cored bar on a spiral. Yes. When the length of the brush bristle is 20 mm or more, the brush member 71 is repeatedly rubbed with the photosensitive drum 1 or the intermediate transfer member 15 along with the operation time of the brush member 71, and the inclination angle in the reverse direction of the brush body is reduced and falls. The filming removability of the photosensitive drum 1 or the intermediate transfer member 15 is lowered. On the other hand, when the length of the bristle is 0.2 mm or less, there is a case where the filming substance cannot be effectively removed because the physical contact force is insufficient.

The bristle of the brush member 71 is formed of a fiber, and the resistance value of the fiber is a low resistance fiber of 10 ⁵ to 10 ¹⁰ (Ω · cm). If the resistance is higher than this, the brush fibers retain electric charges due to frictional charging due to the contact between the brush fibers and the photosensitive drum 1 or the intermediate transfer member 15, and the recovery by the recovery member 72 becomes difficult. Therefore, the resistance of the brush fiber is lowered so that no charge is accumulated in the brush fiber.

  A brush member power source 75 for applying a voltage is connected to the core of the brush member 71. The resistance of the brush fibers of the brush member 71 is a low resistance brush as described above, and an electric field can be formed at the contact portion with the photosensitive drum 1 or the intermediate transfer member 15 by applying a voltage to the cored bar. . By forming an electric field, it becomes possible to electrically adsorb deposits on the photosensitive drum 1 or the intermediate transfer member 15 and the polished filming substance.

The brush member 71 rotates in the same rotation direction as the rotation direction of the photosensitive drum 1 or the intermediate transfer member 15 as indicated by an arrow B in FIG. 1 or FIG. Since the brush member 71 rotates in the same direction as the photosensitive drum 1 or the intermediate transfer member 15, it is possible to exhibit a function excellent in filming substance and toner removability.
The recovery member 72 is a roller-shaped rotating body, and has a configuration in which a metal core is covered with a medium-resistance elastic member. A recovery member power source 76 for applying a voltage is connected to the cored bar.

A scraper 74 for removing foreign matters such as toner collected and adhered to the surface is disposed in contact with the collecting member 72. The recovery member 72 rotates in the C direction shown in FIG. 1 or FIG. 2, and the scraper 74 contacts the rotation direction C of the recovery member 72 in the counter direction.
The collection member 72 rotates in the opposite direction to the brush member 71. As will be described later, since the foreign material from the brush member 71 by the collecting member 72 is electrically collected by voltage application, the deterioration of the brush member 71 is effectively prevented by avoiding physical contact with a large load. To prevent.

The function of the filming removal apparatus 7 will be described below.
As shown in FIG. 2 or FIG. 3, the brush member 71 as a filming removing member is configured to rotate in contact with the photosensitive drum 1 or the intermediate transfer member 15 in the counter direction. Therefore, the toner and the filming substance on the photosensitive drum 1 or the intermediate transfer member 15 can be removed by the physical force by the brush member 71.
Further, a brush member power source 75 is connected to the core of the brush member 71, and the resistance of the fibers of the brush hair is a low resistance fiber having a resistance of 10 ⁵ to 10 ¹⁰ Ω · cm. For this reason, by applying an appropriate voltage to the core of the brush member 71, it is possible to electrically adsorb the residual toner and the filming substance on the photosensitive drum 1 or the intermediate transfer member 15.
The toner and filming material adsorbed on the brush member 71 are collected by the collecting member 72.

  A recovery member power source 76 is connected to the recovery member 72. By applying a bias by the power source, a voltage having a polarity different from the polarity of the filming substance adsorbed on the brush member 71 can be applied. As a result, the toner and the filming substance are electrically recovered from the brush member 71 to the recovery member 72.

  For example, in the case of an image forming apparatus using a negative polarity toner as a developer, the transfer residual toner on the photosensitive drum 1 or the intermediate transfer body 7 changes to a positive polarity due to the influence of the transfer bias of the transfer device. Yes. Accordingly, the negative voltage V <b> 1 is applied to the brush member 71 from the brush member power source 75, so that foreign matters adhere to the brush member 71. On the other hand, when a negative polarity voltage V2 (| V1 | <| V2 |) is applied to the recovery member 72 from the recovery member power supply 76 connected to the recovery member 72, foreign matter is removed from the brush member 71 by a stronger bias voltage. The recovery member 72 can be recovered. Thus, the bias voltage applied to the recovery member 72 has the same polarity as the bias of the brush member 71 and has a large absolute value.

In the present invention, the toner and the filming substance can be further removed from the photosensitive drum 1 or the intermediate transfer member 15 by being configured as described above.
As the toner accumulates on the brush member 71, the effect of scraping the filming material on the surface of the photosensitive drum 1 or the intermediate transfer member 15 gradually decreases. In order to prevent this, the image forming apparatus of the present invention has a filming removal mode described below.

  The image forming apparatus according to the present invention has a filming removal mode in which the collecting member 72 collects deposits, which are foreign matters attached to the brush member 71, before removing the filming substance on the photosensitive drum 1 or the intermediate transfer body 15. Execute. By executing this filming removal mode, the filming material is reduced from the brush member 71 so that the filming material can be adsorbed from the image carrier. Alternatively, the photosensitive drum 1 or the intermediate transfer member 15 is polished after confirming that at least the film member can be adsorbed by the brush member 71.

  The above-described filming removal mode is automatically executed. Also, filming removal can be performed in advance. That is, the image forming apparatus has a computer as a control unit, and the control unit has a CPU. In addition, the controller has a ROM and a RAM, and the program is stored in a memory such as the ROM or RAM. In the image forming apparatus, when it is determined whether or not a predetermined value (for example, 1000 sheets of A4 size as a predetermined value) has been reached, the control unit performs filming removal on the filming removal apparatus 7 periodically. The filming removal device 7 is caused to execute the filming removal operation as is performed. Prior to this removal operation, a program for controlling to automatically execute the filming removal mode can be loaded. At this time, a value obtained by using a sensor (not shown) in the filming removal device 7 is used to determine the degree of adhesion of the deposits that cause filming such as toner on the brush member 71 of the filming removal device 7. The control unit determines whether or not the deposit on the brush member 71 needs to be removed. If it is determined that the deposit is attached to the brush member 71, the control unit automatically sets the filming removal mode. Can be executed automatically. Thereafter, the filming removal operation on the image carrier is started. If the controller determines that it is not necessary to remove the deposit, the filming removal mode is terminated and the filming removal device 7 is instructed to perform the filming removal operation of the image carrier. The adsorbable amount of the brush member 71 gradually decreases with use. Conditions for recovering filming removal by the recovery member 72 are stored as a table in a memory such as a RAM of the control unit in the image forming apparatus as a function of the secular change of the adsorbable amount that gradually falls. Can be selected from a plurality.

Hereinafter, the present invention will be described more specifically with reference to examples.
Table 1 shows the results of detecting how the filming removal modes “present” and “absent” of the present invention are related to the presence or absence of filming on the photosensitive drum 1.
As an example, the product name imgio MP C3300 / C2800 manufactured by Ricoh Co., Ltd., which was modified, was used. The conditions are 30 ° C. and 80% relative humidity in which the filming substance is likely to adhere to the photosensitive drum 1. The running chart is the size of the transfer material 19 next to the A4 plate, and the image pattern is 100% solid and white. A pattern including 100% part was used. In the filming detection method, the photosensitive drum 1 was irradiated with ultraviolet light and turned black, and the filming portion was determined. In the filming removal mode “present”, that is, when the toner of the brush member 71 is completely collected by the collecting member 72, no filming occurred. On the other hand, when the filming removal mode is “none”, the effect appears in the white 100% portion when the number of printed sheets exceeds 5000 sheets, and when the number exceeds 8000 sheets, the bad effect appears in the 100% white area. Further, in the solid 100% portion, the filming effect started to appear around 9000 sheets, and a clearly bad effect occurred from 15000 sheets.

  FIG. 3 is a diagram showing a detailed configuration of a color image forming apparatus using the present invention for the intermediate transfer belt 15. This figure shows a configuration example in which the filming removing device 7 is provided in contact with the intermediate transfer belt 15 as an image carrier. The filming removal device 7 has the same configuration as that of the filming removal device 7 described above, and the operation thereof is also the same, and thus the description thereof is omitted. In FIG. 3, the filming removal device 7 is not provided for each of the plurality of image forming units 16. Instead, a lubricant application device for applying a lubricant such as zinc stearate is provided for each of the image forming units 16. It has been. With the configuration having such a lubricant application device as a cleaning device for each image forming unit, the image forming apparatus of the present invention can further prevent filming.

  The color image forming apparatus shown in FIG. 3 has a plurality of image forming units 16K, 16C, 16M, and 16Y, an intermediate transfer belt 15, and the filming removal apparatus 7 of the present invention. The image forming units 16K, 16C, 16M, and 16Y are filled with toners of black K, cyan C, magenta M, and yellow Y, respectively, to form a full color image. The order of the toner colors of the image forming units is as follows. In particular, the present invention is not limited to this.

  The cleaning device 30 includes a coating agent 34 for preventing toner filming. The brush roller 37 rotates in contact with the coating agent 34 and supplies the coating agent 34 onto the photosensitive member 1 serving as an image carrier. To do.

  The coating agent 34 is a solidified lubricant additive mainly composed of zinc stearate, which is a fine particle, and is disposed in contact with the brush roller 37 under its own weight, and is a guide provided in the cleaning device 30. Is guided while maintaining a certain degree of freedom.

The brush roller 37 is provided with a bias roller (not shown) that contacts the roller, and the brush roller 37 is charged by applying a DC voltage to the bias roller. Note that the brush fibers of the brush roller 37 are made of conductive fibers, and their electric resistance value is 10 ¹³ Ω · cm or less, and the brush roller 37 is charged with a sufficient charge for removing residual toner, so that The residual toner is effectively scraped off by the brush roller 37.

  The toner images of the respective colors formed by the plurality of image forming units 16K, 16C, 16M, and 16Y are transferred by the primary transfer members 17K, 17C, 17M, and 17Y onto the intermediate transfer member 15 that rotates in the arrow D direction in the drawing. Thus, an image pattern formed of a plurality of colors of toner is obtained. A secondary transfer member 18 is disposed on the intermediate transfer belt 15, and by applying a transfer bias to the secondary transfer member 18, a toner image is transferred to a transfer material 19 such as paper that moves in the direction of arrow E in the figure. .

  The secondary transfer member 18 may be a transfer member such as an elastic roller member, and is brought into contact with the surface of the intermediate transfer member 15 with a predetermined pressing force, and between the secondary transfer member 18 and the intermediate transfer member 15. To form a transfer nip. With the transfer material 19 sandwiched in the transfer nip, a transfer electric field formed by applying a transfer bias having a polarity opposite to that of the toner from the transfer bias power source to the secondary transfer member 18 is applied to the surface of the intermediate transfer member 15. The transferred toner image is transferred onto the transfer material 19. The transfer material 19 onto which the toner image has been transferred in this manner is conveyed to a fixing device (not shown). After the toner image is fixed by the fixing device, the transfer material 19 is discharged together with the image fixed outside the image apparatus.

The intermediate transfer belt 15 is provided with a sensor for stabilizing the density of the output image. Specifically, the toner is deposited on the intermediate transfer belt 15, the laser is irradiated on the toner adhesion portion and the intermediate transfer belt 15 itself on which the toner is not adhered, and the reflected light is received to control the color image forming apparatus. Is going.
However, if a filming substance is attached to the intermediate transfer member 15, the light reflectance gradually changes, and proper control cannot be performed.

  Table 2 shows the results of an example in which the presence or absence of an abnormal image on the intermediate transfer belt 15 was detected in either the filming removal mode “present” or “absent”.

  In this example, a product obtained by remodeling the same brand name “imgio MP C3300 / C2800” manufactured by Ricoh Co., Ltd. was used. The conditions are 30 ° C. and 80% relative humidity in which the filming substance is likely to adhere to the photosensitive drum 1, the running chart has a size of the transfer material 19 of A4 horizontal, the image pattern is 100% solid and 100% white. A pattern including a part was used. As a method for detecting an abnormal image, the density of the output image was measured, and whether or not it was within the standard was determined by ○ ×.

  In the filming removal mode, that is, in the control in which the toner on the brush member 71 is completely collected by the collecting member 72, no filming occurred on the intermediate transfer member 15. On the other hand, in the case of no filming removal mode, the number of printed sheets was outside the density standard from around 6000 sheets due to the transfer material 19.

  DESCRIPTION OF SYMBOLS 1 Photosensitive drum, 2 Charging apparatus, 3 Exposure apparatus, 4 Developing apparatus, 5 Transfer apparatus, 6 Cleaning member, 7 Filming removal apparatus, 8 Static elimination apparatus, 13 Transfer member, 14 Ejection member, 15 Intermediate transfer body (intermediate transfer body) Belt), 16K to 16Y image forming unit, 17 (17K to 17Y) transfer member, 18 secondary transfer member, 19 transfer material (recording paper), 30 (30K to 30Y) cleaning device, 34 coating agent (solid lubricant) ), 37 (37K to 37Y) Brush roller, 71 Filming removal member (brush member), 72 Recovery member, 73 Cleaning member (cleaning blade), 74 Scraper 74, 75 Brush member power source, 76 Recovery member power source

JP 2006-154212 A JP 2004-325621 A JP 2003-114597 A

Claims (7)

A filming removing device for removing a filming substance on the image carrier using the photosensitive member or transfer belt of the image forming apparatus as an image carrier,
The filming removing device rotates while contacting the filming removing member and the filming removing member that rotates while contacting the image bearing member, and the deposit on the image carrier removed by the filming removing member. A filming removing device comprising a collecting member for collecting the film.   2. The filming removing device according to claim 1, wherein the filming removing member collects the deposit on the film removing member by the collecting member before removing the deposit on the image carrier. The filming removing apparatus, wherein the filming material on the image carrier is removed after executing the mode and confirming the removal of the attached matter. 3. The filming removing device according to claim 1, wherein the filming removing member has brush fibers of low resistance fibers having a brush fiber resistance of 10 ⁵ to 10 ¹⁰ (Ω · cm) planted on a base fabric. A filming removing apparatus, wherein a brush member is wound around a spiral of a metal core and is applied with a voltage.   4. The filming removal apparatus according to claim 3, wherein the recovery member is a roller member made of an elastic body, and a voltage is applied to a core metal of the roller member, and the voltage value is a voltage applied to the filming removal member. And a filming removal apparatus characterized by having the same polarity and a large absolute value. In the filming removal apparatus in any one of Claims 1-4,
Further, the filming removing apparatus is characterized in that a blade that contacts the moving direction of the image carrier in the counter direction is provided on the downstream side of the image carrier with respect to the filming removal member.   6. An image forming apparatus comprising the filming removal device according to claim 1, wherein the filming removal member is the image carrier having a photoconductor or a transfer belt of the image forming device as an image carrier. An image forming apparatus that rotates in a counter direction with respect to a moving direction of a body.   7. The image forming apparatus according to claim 6, wherein a filming removal mode for collecting the deposit on the filming removal member is executed by the collecting member before removing the deposit on the image carrier. An image forming apparatus that controls the image forming apparatus.

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