JPS6184675A - cleaning equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Scope of Application in Industry 1] The present invention relates to a cleaning device applied to image forming equipment such as an electrophotographic copying machine, a micro R machine, or a laser beam printer. In particular, the invention relates to a cleaning device for removing residual magnetic agents on the surface of an image carrier.

[Problems to be solved by conventional technology and invention]

Hereinafter, an explanation will be given using an electronic 5-win copying machine as an example.

In an electrophotographic copying machine, when the image carrier is repeatedly reused like a rotating drum, residual adhesion of developer and paper dust on its surface is always removed at the beginning of each cycle. must have been removed, so the cleaner/
Fur brush, magnetic brush, blade,
An elastic roller 'tP' has been devised. especially,
The method of using elastic rollers made of urethane rubber, silicone rubber, fluorine rubber, etc. is to press these elastic rollers against the image carrier and rub the surface of the image bearing member. (2) This is a method of removing deposits from the body surface by using the frictional effect between the body surface and the body surface. These residues deposited on the surface of the image carrier, ie, untransferred toner, melted toner, corona products caused by nL toner corona discharge, etc., are removed by this rubbing effect.

Further, it is penetrated from the surface of the image carrier by a single elastic roller, and scraped off from the roller surface by a scraper pressed against the roller surface.

However, this scraping is not perfect, and the developer removed from the surface of the image carrier leaks from between the roller and the scraper, staining the inside of the copying machine, or falling onto the transfer member of the paper shade, staining the copied image. Sometimes. In particular, if the polarity of the residual development on the image bearing member is the same as the polarity of the surface of the pin, an electrical opposite force will be generated between the first opening □-ra and the residual development 2-, which causes this problem. may be affected. Furthermore, it is conceivable that the waste developer that does not adhere to the a-ra surface will scatter into the cleaner and conversely scatter into the copying machine through the gap in the cleaner container, contaminating the interior of the copying machine.

[Purpose of the invention]

, (All songs are intended to solve the above-mentioned problems and provide a cleaning device that can prevent the magnetic developer from falling or scattering.

[Embodiment in '7] Figure 1 is a schematic diagram of an electrophotographic copying machine to which an embodiment of the present invention can be applied. :jF + After being uniformly charged by the heavy equipment, an electrostatic h1 image is formed by image exposure 3. This latent image is developed using a magnetic P1 phenomenon agent.
The toner image is visualized in the first stage 4, and transferred to a transfer material (paper or plastic T thin plate) by the transfer charger 6.
It is transferred to 5. ! ! ! The transfer material 5 on which the image has been obtained is separated from the image carrier 1 by one-separation charging W7.

The f-magnetic phenomenon agent remaining on the surface of the image carrier 1 without being transferred or the paper powder adhering to the surface of the image carrier 1 are removed by the cleaning stage B and prepared for the next stage.

FIG. 2 is a schematic diagram of the cleaning means 8. Statue II
The residue of the holding member l is pressed against the image bearing member 1 and W! jJ! It is removed by the magnet roller 8a, and also ? The residue that has fallen off the magnetic roller 8a is further scraped onto the magnetic roller 8a by an elastic blade 8d.
! be dropped. And, attached on the surface of the roller 8a,
Alternatively, these scraped residues are carried into the cleaner container $8e with the rotation of the roller 8a, where they are scraped off from the surface of the roller 8a by the scraper 8b that comes into contact with the circumferential surface of the roller 8a, and the waste toner conveying screw 8C As a result, the waste toner is discharged from the cleaner container $8e to the waste toner container.

In this embodiment, since the greening roller that comes into contact with the surface of the image carrier 1 and removes the residue from the surface of the image carrier 1 is a magnetic roller, a blade-scrape failure may occur between the scraper 8b and the roller 8a. Waste toner (magnetic)
Even if the magnetic toner leaks, the magnetic toner remains attached to the surface of the roller 8a due to magnetic force, so it is carried into the cleaner again without contaminating the inside of the copying machine or the transfer material. Furthermore, when using the Jl magnetic roller, less waste toner is scattered inside and outside the cleaner without adhering to the top roller surface, which reduces dirt inside the copying machine.

Next, the configuration of this magnet roller will be explained in detail.

FIG. 3 is a cross-sectional view of an embodiment of one elastic magnet roller.

In the figure, 8f is a magnetic roller consisting of a plurality of magnetic poles, and a rubber layer 8g is coated around the magnetic roller. This rubber layer 8
For example, silicon Φ rubber, urethane rubber, etc. are suitable for g.

811, is a core metal. Further, the magnetic force of the magnetic roller is effective in collecting waste developer if it has a magnetic force of 200 to 1000 Gauss on the surface of the roller 8a, but it is not limited to this and may be selected as appropriate.

Still other embodiments will be described.

FIG. 4 shows another embodiment of the magnetic roller 9 applied to the present invention, which has a three-layer structure including a magnetic roller 9a and an outermost layer 9b.
In between, a sponge layer 9C made of silicone or the like is provided with a suitable hardness.The outermost layer 9b is made of silicone rubber, urethane rubber, or polyester.
1 Cover with ethylene rubber T. In addition, 9d is a core metal.

Here, according to the applicant's experiment, the diameter of the magnetic roller 9a of the magnetic roller 9 of this embodiment is 1411:onm)
, the magnetic force is 200 (GauSs) on the surface of roller 9.
Then, by coating the circumferential surface of the roller 9a with a sponge layer 9C of silicone or the like having a thickness of 2 (mm), and further coating the circumferential surface with silicone rubber 9b having a thickness of 1 (mm), the roller 9a can be formed. The hardness of the roller 9 was 25° to 50' (asuka C1 material 300K), and when the roller 9 came into contact with the surface of the image carrier 1, no scattering occurred (residues could be removed well. This example is one example, and is not limited to this.

FIG. 5 shows another embodiment of the magnet roller 10, in which a sponge layer 10a is coated with a magnet roller '-tob. Note that 10c is a core metal. in this case,
11'1, which may damage the surface of the lt' carrier by magnetic powder in the magnet rubber, is an elastic magnet roller 1.
0 may be brought close to the image carrier, but not in contact with it.

〔Effect of the invention〕

Below 1. As mentioned above, an elastic magnet is attached to the Wsw roller.
By using a roller, the waste developer can be transferred to an elastic magnet roller using magnetic force without impairing its sliding effect (for example, it is also very effective in removing corona products caused by corona discharge that are fused to the surface of the image carrier). This can reduce developer scattering and prevent stains inside devices such as copying machines. Furthermore, even if a scraping failure occurs and the developer leaks from between the scraper and the roller, it will not be collected on the roller surface and carried into the cleaner again, thereby contaminating the inside of an apparatus such as a copying machine.

[Brief explanation of the drawing]

Figure 18 is a schematic diagram of the copying machine, Figure 2 is cleaning r1
18, FIGS. 3, 4, and 5 are cross-sectional views of each embodiment of the elastic magnet roller. In the figure: 1------------m-image carrier. 2.6.7---Corona discharger. 3---One image fog light, 4---One development stage f. 5-----1 transfer material, 8----cleaning f
Stage 8a---Elastic magnet roller. 8b---Scraper. 8cm--Waste toner conveying screw. 8d---Blade. 8h---one core metal, 8f---one magnetic roller. 8g---Rubber layer. 9--Unielastic magnetic roller. 9a---Sponge layer, 9b---Rubber layer. tob--Magnetic rubber.

Claims (1)

[Claims] (1) A cleaning device for removing residual magnetic developer on the surface of an image carrier includes an elastic roller that presses against the surface of the image carrier and rubs the surface, and a scraping member that scrapes off the developer attached to the roller. A cleaning device characterized in that the elastic roller has a magnet roller in its inner layer and an outer layer coated with an elastic body.