JPS58137870A - Roll cleaning device - Google Patents

Abstract

PURPOSE:To improve the cleaning effect, by using a cleaning roll where the number of cells of a foaming resin on the surface layer is a prescribed value. CONSTITUTION:When the number of cells of the foaming resin on the surface layer of a cleaning roll 2 which is turned in press contacting with an image carrier 1 is set to more than 30/inch, a toner is not put into cells to sweep off the toner of carrier and to improve a cleaning effect.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a roller cleaning device used in an electrostatic recording device such as an electrophotographic machine.

Generally, in electrostatic recording devices, corona charging is performed on a drum or belt with a photoconductor layer on the surface, and then light exposure is performed to form a latent charge, or a drum with a dielectric layer is formed on the drum or belt. An ion flow is formed on the belt using an ion control method.

The photoconductor I@ for forming these latent images or the drum or belt provided with the dielectric layer serves as an image carrier and receives the toner σ) supply using the well-known electron beam method. It becomes visible as a skeleton. This great carrier top-11t
The toner is transferred onto the i-transfer sheet, and after the transfer of the toner is completed, the residual toner is wiped off from the Kyuso carrier in preparation for the next bone formation. There is a cleaning method using roller cleaning as a method for wiping off residual toner on the carrier. The present invention relates to improvements to this roller cleaning device.

A roller cleaning device cleans the image carrier,
A roller with a rough surface, for example a roller made of foamed resin, etc. is used, and this roller 2 is rotated in the opposite direction to the moving direction of the image carrier to scrape off the residual toner on the image carrier. It is no longer possible to clean the image carrier by bringing it into contact with the image carrier.

The present inventors have conducted extensive research on a Row 2 cleaning device using foamed resin. That is, various experimental samples were prepared regarding the material, elasticity, average cell (foam hole) size, number of cells per unit area, etc. of the foamed resin, and cleaning experiments were conducted. As a result, it was found that within a certain range limited by the number of cells (the number of cells per 11 nch), the toner adhering to the image bearing member was successfully cleaned by cleaning 0-2;
It has been discovered that toner that has migrated onto the surface is also easily removed. When the number of cells is small, the toner is so small that it creeps into the cells, and if cleaning is performed for a long time, it becomes difficult to remove the toner, reducing cleaning efficiency and shortening the replacement cycle.

The purpose of the present invention is to specify the number of cells and obtain a good cleaning effect. In the cleaning device,
This is achieved by a roller cleaning device of an electrostatic recording device using a foamed resin in which the cleaning row 2 has at least a surface layer with a cell count of 1/in Ch or more.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a schematic sectional view showing a specific example of the present invention. In the figure, the image carrier drum has an image bearing speed of 200 II.
Turn clockwise at I/8. 2 is a cleaning roller made of foamed resin. Polyurethane 7 is the foamed resin.
Ohm (Everlight Scout manufactured by Britstone Tire Co., Ltd.) is suitable, and preferable performance can be obtained even if the material is formed by thermally compressing a foamed resin.

The cleaning row 22 is a cylinder having an outer diameter of ψ, and its surface is rotated by a power (not shown) at a rotation speed of 20 rpm in a direction opposite to the moving direction of the surface of the image carrier 1 at the contact portion. The cleaning roller 2 is brought into pressure contact with the image carrier drum 1 in a V@ arrangement so that the amount of biting is 2 m.

The residual toner 7 adhering to the image bearing drum 1 is scraped off by the cleaning roller 2, and the residual toner 7 adhering to the cleaning roller 2 is further scraped off by the nine plate 3 so as to squeeze the cleaning roller 2. and collected into the cleaning chamber 4.

Here, for cleaning roller 2, the number of cells is 50%.
When using foamed resins of il/1nOh and 701@/1nch, excellent cleaning performance was observed in both cases.

In addition to the above, the present inventors have also tested cleaning rollers 2 using foamed resin with an additional number of cells of 30° and 40 cells/1 nch.
Material +7 = There was a lot of residual image, and after several hundred copies were made, filming occurred on the photoconductor 1, and a low F of the copied image was observed.

From the above test, it was experimentally determined that it is appropriate for the number of cells to be N1/in Ch or more.

FIG. 2 is a schematic sectional view showing a second embodiment, in which the cleaning roller 2 is the same as the embodiment shown in FIG. 1, and shows a cleaning device in which the residual toner 7 is magnetic toner. , as a scraping roll that scrapes off the magnetic toner powder 7 that moves and adheres to the cleaning roller 2.

A sleeve 5 made of a non-magnetic material and a permanent magnet 6 (the surface KN and S poles are alternately magnetized) are provided in the sleeve 5, and the sleeve 5 and the permanent magnet 6 are arranged so as to be rotatable, respectively. It is designed to come into contact with the cleaning row 22.

The magnetic toner powder t4-7 on the cleaning row 22 is
It is pulled by the magnetic force of the permanent magnet 6 and moves onto the sleeve 5 which rotates in the direction of the arrow. The toner 7 attracted and adhered to the sleeve 5 by the magnetic force of the permanent magnet 6 rolls on the sleeve 5 as the sleeve 5 and the permanent magnet 6 rotate in the directions of the arrows shown in the figure, and is designed to squeeze the sleeve 5. Cleaning chamber 4
will be collected within. (One of the sleeve 5 and the permanent magnet 6 may be fixed and the other rotated.) The present invention described above uses a cleaning roller made of foamed resin having the above number of cells.

It was possible to obtain an excellent roller cleaning device that can withstand long-term use, has good cleaning efficiency, and can easily remove toner attached to the cleaning roller.

[Brief explanation of the drawing]

1 and 2 are schematic cross-sectional views showing embodiments of the present invention. 5...Sleeve 6...Permanent magnet 7...Toner powder book 71...-Ingredient toner agent Yoshimi Kuwahara

Claims (1)

[Scope of Claims] (1) In an electrostatic recording device roller cleaning device that removes residual toner on an image carrier with a cleaning roller using a foamed resin, the number of cells of the foamed resin in at least the surface layer of the cleaning roller is (capital) units/i n c
A roller cleaning device for an electrostatic recording device using a cleaning roller having a hardness of at least h. +21. The roller cleaning device according to claim 1, wherein the cleaning roller is pressed against the image carrier and rotated in the opposite direction at the contact portion. (3) A sleeve made of a non-magnetic material and a magnetic material provided inside the sleeve are rotatably disposed as a scraping roll for removing magnetic toner adhering to the cleaning roller, and the sleeve contacts the IJ-two roller. A roller cleaning device according to claim 1 or 2.