JPH0331975Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an auxiliary cleaning mechanism in a photographing machine, and more specifically, an auxiliary cleaning mechanism for effectively removing magnetic toner or carrier used in magnetic brush development method remaining on the surface of a photoreceptor. Regarding the cleaning mechanism.

Generally, in a copying machine, a rotating photoreceptor drum having a photoreceptor layer on a conductive substrate is provided, the surface of the photoreceptor drum is uniformly charged, this is applied to image exposure and development operations, and then a predetermined sheet of paper is charged. A copy image is obtained by transferring the developed image and fixing it by heat, pressure, or the like. Further, after the transfer process, the photosensitive drum is subjected to a static eliminating operation using a static eliminating light source, and is brought into contact with a cleaning blade to remove toner and the like remaining on the surface.

However, when toner remains on the surface of the photoreceptor drum, when performing the above-mentioned static elimination operation, the surface of the photoreceptor drum where the toner is present is not exposed to light, so the static elimination is not performed, and therefore, the remaining toner is removed by the cleaning blade. There is also the disadvantage that the removal of

That is, an object of the present invention is to provide an auxiliary cleaning mechanism that effectively eliminates the above-mentioned drawbacks.

Another object of the present invention is to provide an auxiliary cleaning mechanism for effectively removing magnetic toner or carrier used in magnetic brush development remaining on the surface of a photoreceptor.

According to the present invention, at a position downstream of the transfer charging device and upstream of the cleaning blade with respect to the rotational direction of the photoconductor drum, a light source for neutralizing static electricity is provided near the outer surface of the photoconductor drum; An auxiliary cleaning mechanism for a copying machine consisting of a magnetic rotating body provided in a space and having S poles and N poles arranged alternately, the magnetic rotating body being located at a position facing the static elimination light source or An auxiliary cleaning mechanism is provided, which is disposed at a portion located slightly away from the transfer charging device.

The present invention will be described in detail below based on specific examples shown in the accompanying drawings.

Referring to FIG. 1 showing an image forming mechanism of a copying machine equipped with an auxiliary cleaning mechanism of the present invention, this image forming mechanism includes a rotating photoreceptor drum 3 having a photoconductor layer 2 on a conductive substrate 1; A main charging device 4 provided around it, an optical system 5 for image exposure, a magnetic brush developing device 6, a transfer charging device 7,
It consists of a paper separation charging device 8 for separating paper, a light source 9 for static elimination, and a cleaning blade 10 that rubs against the photosensitive drum 3.

That is, the surface of the photoconductor drum 3 (photoconductor layer 2)
is charged with a charge of a predetermined polarity by the main charging device 4. The document to be copied is then irradiated with a predetermined light source (not shown), and the photoconductor layer 2 is exposed to the light beam image of the document through the optical system 5, thereby forming an electrostatic latent image corresponding to the document image. This electrostatic latent image is developed with toner by a developing device 6. Further, the transfer paper 11 is supplied so as to be in contact with the drum surface at the position of the transfer charging device 7, and corona charge with the same polarity as the electrostatic image is performed from the back side of the transfer paper 11 to transfer the toner image onto the transfer paper 11. The transfer paper 11 on which the toner image has been transferred is electrostatically peeled off from the drum 3 by AC charge removal by the charging device 8, and sent to a processing area such as a fixing area (not shown).

After the toner has been transferred, the photoconductor layer 2 is exposed to light from the entire surface of the photoconductor layer 2 to eliminate residual charges, and then the remaining toner is removed by the cleaning blade 10.

The important feature of this invention is that the photoreceptor drum 3
A rotating magnet 12 in which S poles and N poles are alternately arranged is provided inside the magnet. That is, the rotating magnet 12 is placed at a position facing the static elimination light source 9 or at a position slightly closer to the transfer charging device 7 from this position.

That is, in the present invention, the magnet 12 is rotated when the entire surface is exposed by the static eliminating light source 9.
Referring to the figure, the residual magnetic toner 20 on the photoconductor layer 2 vibrates or rolls from side to side due to the magnetic attractive force and repulsive force of the magnet 12. Therefore, it will be understood that the portions of the photoconductor layer 2 that were covered by the residual toner 20 are also exposed to light, and thus the entire surface of the photoconductor layer 2 is neutralized.

According to the present invention, not only the residual charge on the photoconductor layer 2 is removed very effectively, but also the electrostatic attraction between the residual toner and the photoconductor layer 2 is eliminated. A significant advantage is achieved in that the subsequent removal of residual toner by the cleaning blade 10 is also carried out effectively.

Note that the above-mentioned present invention achieves remarkable effects when a so-called one-component magnetic toner is used; however,
Even when a two-component developer is used, it is effective in removing the magnetic carrier.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an image forming mechanism equipped with the auxiliary cleaning mechanism of the present invention, and FIG. 2 is an explanatory diagram showing the effects of the auxiliary cleaning mechanism of the present invention. 1 is a conductive layer substrate, 2 is a photoconductive layer, 3 is a photosensitive drum, 4 is a main charging device, 5 is an optical system, 6 is a developing device, 7 is a charging device for transfer, 8 is a charging device for paper separation , 9 is a light source for static elimination, 10 is a cleaning blade, 11 is a transfer paper, 12 is a rotating magnet, 2
0 indicates residual magnetic toner.

Claims (1)

[Claims for Utility Model Registration] A light source for neutralizing static electricity provided near the outer surface of the photoconductor drum at a position downstream of the transfer charging device and upstream of the cleaning blade with respect to the rotational direction of the photoconductor drum; An auxiliary cleaning mechanism for a copying machine consisting of a magnetic rotating body provided in an inner space of a drum and having S and N poles arranged alternately, the magnetic rotating body facing the static elimination light source. An auxiliary cleaning mechanism characterized in that the auxiliary cleaning mechanism is disposed at a position where the auxiliary cleaning mechanism is located or at a portion located slightly closer to the transfer charging device from the position.