JPH0143725Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device for a wet-type electrophotographic copying machine.

For example, as shown in FIG. 1, a wet-type electrophotographic copying machine includes a cleaning blade 2 and a cleaning roller 3 that come into contact with the photosensitive drum 1 in the generatrix direction, and discharges a cleaning liquid from a cleaning liquid delivery pipe 4. By this, the developer containing toner scraped off by the blade 2 is washed away. Conventionally, the cleaning liquid supply pipe was composed of one pipe, and
It is arranged only on one side end side of the photosensitive drum 1, and its discharge port is directed from the front side of the drum to the back side in the figure.

In such a conventional configuration, since the cleaning liquid is ejected in one direction, as shown in FIG. When such a pool 5 occurs, the cleaning liquid returns to the pipe 4 side, making it difficult to wash away the pool, and more and more untransferred toner accumulates in the pool, resulting in Black streaks may appear on the copy in this area, or when the cleaning blade 2 is separated from the drum after the machine has stopped, sludge-like developer flows out from the bottom of the blade and solidifies, removing unnecessary toner from the copy. It may stick.

Generally speaking, one way to solve this problem is to increase the amount of cleaning fluid supplied, but if you do this, the cleaning fluid will splash on the drum surface and stain the surrounding area. .
Furthermore, it is also difficult to select an optimal pump with a guaranteed discharge force that can simultaneously remove sludge at a location away from the pipe discharge port and prevent liquid splashing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cleaning device for a wet-type electrophotographic copying machine that eliminates the above-mentioned conventional drawbacks.

FIG. 3 shows a cleaning device according to an embodiment of the present invention, and the feature of this device configuration is that a pair of cleaning liquid delivery pipes 6, 7
is provided approximately at the center of the photoreceptor drum 1 in the generatrix direction,
A pair of cleaning liquid supply pipes 6, so that the discharge port of one pipe 6 faces one side end of the photoconductor drum 1, and the discharge port of the other pipe 7 faces the other side end of the photoconductor drum 1, respectively. 7 is arranged and configured. The directions of the discharge ports are determined so that the developer discharged from both discharge ports does not collide with each other.

According to the cleaning device of the present invention having the above-described structure, developer sludge located on one side end side and the other side end side of the photoreceptor drum can be equally removed, and cleaning liquid supply Since the distance from the discharge port of the pipe to the end of the drum is half that of the conventional one, it is possible to sufficiently flush the sludge from the end of the drum even if the liquid delivery pressure is low.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional cleaning device, FIG. 2 is a front view of the cleaning device, and FIG. 3 is a front view of an improved cleaning device according to an embodiment of the present invention. 1...Photosensitive drum, 2...Cleaning blade, 6, 7...Cleaning liquid delivery pipe.

Claims (1)

[Scope of utility model registration request] A cleaning device is provided in which a cleaning blade is brought into contact with the photoreceptor drum in the generatrix direction, and a cleaning liquid is discharged and supplied from a cleaning liquid delivery pipe to the vicinity of this abutting portion to wash and clean the photoreceptor drum. A pair of liquid delivery pipes are provided approximately at the center of the photoreceptor drum in the generatrix direction, with the discharge port of one pipe being at one side end of the photoreceptor drum, and the discharge port of the other pipe being located near the photoreceptor drum. 1. A cleaning device for a wet-type electrophotographic copying machine, characterized in that a pair of cleaning liquid delivery pipes are arranged so as to face the other side end of the apparatus.