JPS638783A - Cleaning device - Google Patents

Abstract

PURPOSE:To surely remove a remaining toner on a photosensitive drum with simple constitution and to allow the titled device to have advantages of cost as well as space, by forming a recovery blade with a conductive member and connecting it to the earth. CONSTITUTION:Materials like a conductive elastomer where carbon is mixed with a synthetic resin are used as materials of a recovery blade 17, and the resistivity of these materials is set to 10<5>-10<8>OMEGAcm, and the recovery blade 17 is connected to the earth. The remaining toner on a photosensitive drum 11 is moved from the side of a transfer device 12 to the side of a cleaning device 14 by rotation of the photosensitive drum 11. At this time, the electric field due to the potential difference of the photosensitive drum 11 is earthed by the recovery blade 17 brought into contact with the photosensitive drum 11 to considerably reduce this electric field. In this state, the remaining toner on the photosensitive drum 11 is removed by the cleaning blade 17. As the result, the toner is effectively prevented from passing around to the rear side of the cleaning blade, and the remaining toner on the photosensitive drum 11 is surely removed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cleaning device for cleaning a photosensitive drum of a copying device.

(Prior Art) Generally, a photoreceptor drum cleaning device is disposed inside a copying device to remove toner adhering to the photoreceptor drum of the copying device.

FIG. 2 shows such a conventional photoreceptor drum cleaning device, and in the figure, reference numeral 1 indicates a photoreceptor drum on which a toner image is formed.

The toner image on the photosensitive drum 1 is transferred onto the recording member P by a transfer device @2 and a peeling device 3. Further, reference numeral 4 indicates a cleaning device for removing residual toner from the photosensitive drum 1. The cleaning device 4 includes a cleaning blade 6 which is movable toward and away from the photoreceptor drum 1 by a balancer 5 and which removes residual toner from the photoreceptor drum 1; It includes a recovery blade 7 for recovering toner, and a recovery auger 8 for conveying the recovered toner.

(Problems to be solved by the invention) However, in the above-mentioned conventional cleaning device,
An electric field is generated at the boundary between the toner image forming area and the toner image non-forming area on the photoreceptor drum 1 due to the potential difference caused by the difference in the way the transfer corona discharge is applied, as shown in FIG.
The lower part of the toner T turns around to the back side of the cleaning blade 6, and this turned toner T is attracted onto the photosensitive drum 1 again, and as shown in FIG. 4, an unnecessary toner image A is formed on the recording member P.
The problem was that it became established. Therefore, as shown by the two-dot chain line in FIG.
It is conceivable to provide a static eliminator 9 between the photosensitive drum 1 and the cleaning device 4 in order to reduce the potential difference of the photosensitive drum 1, but this is disadvantageous in terms of cost and also in terms of downsizing the copying device. This was a major obstacle, and the problem was that it was extremely disadvantageous in terms of space.

The present invention is intended to solve the above-mentioned problems, and can reliably remove residual toner on the photosensitive drum with a simple configuration, and is advantageous in terms of cost and space. The purpose is to provide a cleaning device.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a photoreceptor drum that is disposed in contact with the photoreceptor drum so as to remove toner remaining on the photoreceptor drum. In a cleaning device comprising a cleaning blade and a recovery blade disposed in contact with the photosensitive drum so as to collect toner removed by the cleaning blade, the recovery blade is formed of a conductive member and is grounded. It is connected.

(Function) According to the present invention, by using the above-mentioned means, residual toner on the photosensitive drum can be removed reliably and in a good manner with a simple configuration, and furthermore, the miniaturization and cost reduction of the copying apparatus can be greatly improved. Can be done.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 shows a cleaning device according to an embodiment of the present invention, and in the same figure, reference numeral 11 indicates a photosensitive drum on which a toner image is formed. The toner image on the photosensitive drum 11 is transferred onto the recording member P by a transfer device 12 and a peeling device 13. Further, 14 indicates a cleaning device for removing residual toner from the photosensitive drum 11.

The cleaning device 14 is arranged so as to be able to approach and separate from the photoreceptor drum 11 by a balancer 15.
a cleaning blade 16 for removing residual toner;
A recovery blade 17 for recovering the toner removed by the cleaning blade 16 and a recovery auger 8 for conveying the recovered toner are provided. The recovery blade 17 described above is made of a material such as a conductive elastomer made by mixing carbon with synthetic resin, and the resistivity of this material is 105 to 10'ΩCT.
I am using the II. Also recovery blade 1
7 is connected to ground.

Therefore, in this embodiment, first, the toner image on the photosensitive drum 11 is transferred onto the recording member P by the transfer device 12 and the peeling device 13. The residual toner remaining on the photosensitive drum 11 is moved from the transfer device 12 side to the cleaning device 14 side by rotation of the photosensitive drum 11.

Further, at this time, the electric field due to the potential difference of the photoreceptor drum 11 is grounded by the recovery blade 17 that is in contact with the photoreceptor drum 11, so that it is significantly reduced.

In this state, the residual toner on the photosensitive drum 11 is removed by the cleaning blade 17.

In this embodiment, the recovery blade 17 is made of a conductive material and is grounded, so that the electric field generated on the photoreceptor drum 7 is significantly reduced, and as a result, the back side of the cleaning blade, which has been a problem in the past, is Toner circulation is effectively prevented, and residual toner on the photoreceptor drum 11 can be reliably removed. Further, there is no need to newly provide a static eliminator between the transfer device and the cleaning device as in the conventional case, and as a result, the size and cost of the copying device can be significantly reduced.

[Effects of the Invention] As explained above, the cleaning device of the present invention has a simple configuration, can reliably remove residual toner on the photoreceptor drum, and is advantageous in terms of cost and space. Can be done.

[Brief explanation of drawings]

FIG. 1 is a side sectional view for explaining a cleaning device according to an embodiment of the present invention, FIG. 2 is a side sectional view for explaining a conventional cleaning device, and FIG. 3 is a main part of FIG. 2. The enlarged sectional view and FIG. 4 are plan views of the recording member for explaining the operating state of the cleaning device of FIG. 2. 11...Photosensitive drum 14...Cleaning device 16...
...Cleaning blade 17...
・Recovery Blade Applicant Toshiba Corporation Representative Patent Attorney Sasu Suyama - Figure 1

Claims (1)

[Claims] (1) A cleaning blade disposed in contact with the photoconductor drum so as to remove toner remaining on the photoconductor drum, and a cleaning blade that contacts the photoconductor drum so as to collect the toner removed by the cleaning blade. What is claimed is: 1. A cleaning device comprising: a recovery blade disposed as an electrically conductive member;