JPH04112274U - fur brush cleaning device - Google Patents

Abstract

(57) [Summary] [Purpose] To effectively remove toner, paper powder, curls, and filming substance residues remaining on a photoreceptor to obtain a good recorded image. [Structure] A fur brush cleaning device that cleans residual toner 20 on a photoreceptor 1 by applying a bias voltage to two conductive fur brushes 10 and 11,
Of the two conductive fur brushes, a bias voltage 19 having the opposite polarity to the toner is applied to one conductive fur brush 10, and a bias voltage 18 having the same polarity as the toner is applied to the other conductive fur brush 11. did.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is an electrophotographic image recording device using electrophotography such as a copying machine or a printer. Residual toner, paper powder, curls, and film on image carriers such as photoreceptors used in The present invention relates to a cleaning device for cleaning substances.

0002

[Conventional technology]

In electrophotographic image recording devices using electrophotography such as copying machines and printers, In order to stably obtain good images, it is necessary to remove residual toner and other residue from previous image formation. The function of the cleaning device that removes residue from image carriers such as photoreceptors is fully demonstrated. It is necessary to do so. Therefore, various cleaning devices have been proposed in the past. It is. As an example, in Utility Model Application Publication No. 64-10770, a pair of file - In a cleaning device with a brush, one fur brush is connected to the photoreceptor. The collision energy is compared to the collision energy of the fur brush for toner removal with the photoreceptor. By increasing the size of the photoreceptor surface without incorporating a separate removal device, Cleaning that makes it possible to scrape off stubbornly adhered residues, foreign matter, etc. A device has been proposed.

0003

[Problem that the idea aims to solve]

When removing residual toner on such photoreceptors, there are several things that must be considered. This means that there is not only residual toner on the photoconductor, but also paper dust, curls, filming substances, etc. It also contains many oppositely charged substances. This reversely charged toner or paper The powder cannot be cleaned normally and remains on the photoconductor, causing background stains on copied images. It appears. Additionally, there is a filming substance attached to the photoreceptor, and this film The lumining substance adheres firmly to the photoreceptor and is suitable for toner cleaning. It is difficult to remove under such conditions. Due to the adhesion of this filming substance, white streaks may appear. This results in the occurrence of abnormal images such as , black lines, etc., resulting in a decrease in image quality.

0004 In view of the above problems, the purpose of the present invention is to eliminate toner remaining on an image bearing member such as a photoconductor. Fur that can effectively clean residues of paper dust, crucibles and filming substances An object of the present invention is to provide a brush cleaning device.

[0005]

[Means to solve the problem]

According to the invention described in claim 1, residual toner on the image bearing member after transfer is removed by two furblars. A fur brush cleaning device that applies a bias voltage to the fur brush cleaning device. one of the two fur brushes has a toner and a battery of opposite polarity. Apply a bias voltage, and apply a bias voltage of the same polarity as the toner to the other fur brush. The configuration is such that the voltage is applied.

[0006] According to the second aspect of the invention, residual toner on the image bearing member after transfer is removed by a plurality of fur brushes. A fur brush cleaning device that applies a bias voltage to the fur brush cleaning device. At least one of the plurality of fur brushes contains toner and A bias voltage of the same polarity is applied, and the fur brush of the same polarity is applied with a bias voltage of the opposite polarity to the toner. It is installed downstream in the image forming process from the fur brush to which a bias voltage is applied. The structure is as follows.

[0007] The device according to claim 3 is the device according to claim 1 or 2, wherein the device according to claim 1 or 2, A fur brush to which a bias voltage of the same polarity as the toner is applied is attached to the surface of the image carrier. As a configuration with a brush that has good scraping properties for filmed substances There is.

[0008]

[Effect]

In the invention according to claim 1, the polarity of the bias voltage applied to the two fur brushes is By using different fur brushes, the first fur brush removes residual toner, and the second fur brush removes residual toner. Remove reversely charged paper dust, curls, etc. with a fur brush. Also, claim 2 In the idea of The remaining toner is removed using a fur brush to which a bias voltage of opposite polarity is applied. Ru. According to the third aspect of the present invention, a bias voltage having the same polarity as that of the toner is applied. The fur brush does not need to remove residual toner, so it does not adhere to the image carrier surface. It is possible to create brush conditions that allow for good scraping of filmed substances. Yes, it can effectively remove filming substances.

[0009]

【Example】

Examples of the present invention will be described below. First, before explaining this example, FIG. Accordingly, an electronic photographic copying device in which the fur brush cleaning device according to the present invention is adopted. The general configuration of the photographing machine will be explained. In FIG. 3, numeral 1 is formed into a drum shape. A photoreceptor is shown. Around the photoconductor 1, a charge of a predetermined polarity is applied to the photoconductor 1. a charger 2, which develops an electrostatic latent image formed by image exposure L after charging; , a transfer device 6 for transferring the toner image onto the recording paper S, and separating the recording paper S from the photoreceptor 1. a cleaning blade 8 for removing residual toner on the photoreceptor; and a cleaning device 9 are respectively provided. When copying, photoreceptor 1 is After being rotated in the direction and uniformly charged by the charger 2, it is exposed by the image exposure L. An electrostatic latent image is formed on the photoreceptor 1. In addition, in the case of this embodiment, the charger 2 The polarity of the charge charged by is positive. Electrostatic latent formed on photoreceptor 1 The image is then visualized by a developer 3. Next, the recording paper S is transferred by the transfer device 6. By applying a corona discharge of opposite polarity to the toner from behind, that is, positive polarity, The visible image on the photoreceptor 1 is transferred to the recording paper S. After the transfer, the photoreceptor 1 is Residual toner etc. are removed by a leaning blade 8 and a cleaning device 9. , subjected to a new copying process.

0010 FIG. 1 is a schematic diagram of an embodiment of a fur brush cleaning device 9 according to the present invention. It is. In FIG. 1, numeral 1 is a photoreceptor, and the fur brush cleaning device Inside the photoconductor 9, two conductive fur brushes 10 and 11 are installed to rotate the photoconductor 1. It is provided so as to be parallel to and in contact with the rotation direction. Conductive fur brush 10 , 11 are in contact with collection rollers 12 and 13 for collecting attached toner, etc., respectively. The collection rollers 12 and 13 are provided with a collection coil 16 and a rotation Scrapers 14 and 15 are brought into contact with the storage box 17. In addition, conductive fur A positive bias voltage is applied to the brush 10 by a bias voltage source 19 to A negative bias voltage is applied to the electric fur brush 11 by a bias voltage source 18. has been added.

[0011] The conductive fur brush 10 disposed on the upstream side with respect to the rotation direction collects residual toner 20. The conditions are set to provide good cleaning performance. On the other hand, The installed conductive fur brush 11 protects against paper dust, curls, filming substances, etc. It is considered to be a good condition for scraping off. Such brush conditions include, for example, The flocking density of the upstream conductive fur brush 10 is compared to the downstream conductive fur brush 11. It may be larger than the hair transplant density. Figure 2 shows the flocking density (horizontal axis) and toner density. FIG. 3 is a diagram showing cleaning performance and filming prevention performance (vertical axis). In Figure 2 The broken line shows the filming prevention property curve, and the solid line shows the toner cleaning property curve. ing. By setting the two conductive fur brushes to different conditions in this way, the toner It is possible to satisfy both the cleaning performance and the filming prevention performance.

0012 Next, the operation of this embodiment will be explained with reference to FIG. 1. on photoreceptor 1 The residual toner 20 is transferred to a conductor to which a bias voltage of opposite polarity (positive in this case) is applied. The conductive fur brush 10 electrostatically cleans the conductive fur brush. The toner adhering to 10 is scraped off by a scraper 14 that is in contact with a collection roller 12. The toner is then discharged to the outside of the cleaning device 9 by the toner collection coil 16. Ma Additionally, as mentioned above, some toner, paper powder, talc, etc. have reverse polarity (in this case, positive). The conductive fur brush 10 can clean the conductive fur brush 10. is not processed. However, the conductive fur brush 11 on the downstream side does not have the conductive fur brush 11 on the upstream side. A bias of opposite polarity (negative in this case) to the conductive fur brush 10 is applied, and the conductive fur brush 10 is Reversely charged toner, paper powder, and tar that were not cleaned with the electric fur brush 10 and the like are cleaned with a conductive fur brush 11. And they are collected by It is collected into a collection box 17 by a roller 13 and a scraper 15. In this way, one By changing the electrical and physical conditions of the pair of conductive fur brushes, Efficiently cleans toner, paper dust, talc, and filming substances remaining on image quality.

[0013] The present invention is not limited to the embodiments described above, and various modifications are possible. For example, conductive fabric - The brush 11 has a row that is good at scraping off paper dust, curls, filming substances, etc. In addition to the flocking density, the factors include brush hardness, brush diameter, brush rotation speed, You can choose the amount of brush penetration, etc. Further, in the above embodiment, a pair of conductors Although an electrically conductive fur brush was used, three or more electrically conductive fur brushes are provided, and the At least one of the fur brushes has a bias of the same polarity as the toner. Efficiently cleans paper dust, talc, and filming substances by applying voltage. It is clear that it is possible to

[0014]

[Effect of the idea]

In the invention according to claim 1, the polarity of the bias voltage applied to the two fur brushes is By differentiating the , Kuruk etc. can be removed. Moreover, in the invention according to claim 2, three or more In a cleaning device configured to have fur brushes of the same polarity, Next, remove the oppositely charged paper dust, cracks, etc., and apply a bias voltage with the opposite polarity to the toner. The added fur brush can remove residual toner. Also, claim 3 According to the invention, changing the physical conditions of at least one fur brush. Accordingly, the filming substance on the photoreceptor can be effectively removed. Therefore, in this invention According to This allows for effective cleaning of substance residues.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a fur brush cleaning device according to an embodiment of the present invention.

FIG. 2 is a diagram showing flocking density, toner cleaning performance, and filming prevention performance.

FIG. 3 is a schematic configuration diagram of an electrophotographic copying machine that employs a fur brush cleaning device according to the present invention.

[Explanation of symbols]

1 Photoreceptor 9 Cleaning device 10 Conductive fur brush 11 Conductive fur brush 12 Collection roller 13 Collection roller 14 Scraper 15 scraper 16 Recovery coil 17 Collection box

Claims (3)

[Scope of utility model registration request] Claims: 1. A fur brush cleaning device that cleans residual toner on an image bearing member after transfer by applying a bias voltage to two fur brushes, in which one of the two fur brushes has a A fur brush cleaning device characterized in that a bias voltage having a polarity opposite to that of the toner is applied, and a bias voltage having the same polarity as that of the toner is applied to the other fur brush. 2. A fur brush cleaning device that cleans residual toner on an image bearing member after transfer by applying a bias voltage to a plurality of fur brushes, wherein at least one of the plurality of fur brushes has no toner remaining on the image bearing member. A fur brush cleaning device that applies a bias voltage of the same polarity as the toner, and that the fur brush of the same polarity is provided downstream in an image forming process from the fur brush to which a bias voltage of the opposite polarity to that of the toner is applied. . 3. A fur brush to which a bias voltage of the same polarity as that of the toner is applied is set to have a brush condition that allows for good scraping of filming substances attached to the surface of the image carrier. The fur brush cleaning device according to claim 1 or claim 2.