JPS597984A - Cleaning device of electrophotographic copying machine - Google Patents

Abstract

PURPOSE:To prevent damage of the surface of a photoreceptor even when mechanical stress is applied to both a cleaning blade and a photosensitive drum and to bring both into contact automatically with high precision, by providing the cleaning blade nearly in the radial direction of the photosensitive drum in a free sliding state. CONSTITUTION:A holder 4 for holding the blade 3 is attached to a copying machine body 6 with a guide pin 7 through the long-sized hole 8 of the holder. The holder 4 is attached to the main body 6 with a pin 7a and a stopper pin 7b. The long-sized hole 8 has its long diameter nearly in the radial direction of the drum and the stopper pin 7b holds the holder 4 so that the holder is slidable on the main body 6 as shown by an arrow. The blade 3 contacts the drum 1 by the total weight of the blade 3 and holder 4 or by applying constant pressure by a spring 9 shown by a broken line. The rotation oscillation of the drum and an impact due to the projection and recess of the drum surface are absorbed by the movement of the blade 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning device for an electronic copying machine, and more particularly to an improvement in a blade-type cleaning device that uses a blade to remove toner powder remaining on a photosensitive drum of an electronic copying machine. It is something.

Residual toner (2) on the photoreceptor drum (1) in a conventional blade-type cleaning device installation in an electronic copier
The elastic plate r(a+) is attached to the blade holder (4), and the blade is applied with a predetermined contact force by a solenoid or spring, etc., and comes into contact with the surface of the photoreceptor drum. Since the holder 9 is attached to the copying machine main body (6) with a set screw (5), the positional relationship of their contact is fixed (see Figure 1).Therefore, mechanical vibration of the photoconductor drum or photoconductor Changes in the state of contact between the photoreceptor drum and plate F due to unevenness on the body surface are only compensated for by the cold absorption due to the elasticity of the blade, and therefore the wear and impact given by the blade to the photoreceptor surface cannot be overlooked. This is the main cause of damage to the photoreceptor surface.

The present invention has been made in order to eliminate the above-mentioned drawbacks in the prior art, and its purpose is to prevent damage to the photoreceptor surface even if the contact state between the photoreceptor surface and the plate r changes. It is an object of the present invention to provide a blade-type cleaning device that does not cause problems.

The above objects of the present invention are achieved by improving the blade retention mechanism by the blade holder. That is, according to the present invention, the blade holder is attached to the copying machine main body so that the blade and the blade holder that holds the blade are integrally movable approximately in the radial direction of the photoreceptor drum, and the blade is attached to the photoreceptor drum. The impact exerted by the blade on the surface of the photoreceptor can be eliminated by bringing the blade into contact with the blade by the total weight of the blade and the blade holder or by applying the action of a suitable pressure spring to the blade holder.

The present invention will be described in detail below with reference to the drawings. Second
In the figure, the blade holder (4) holding the blade (3) is attached to the copying machine body (6) using a guide pin (7) through a long hole (8) provided in the blade holder. ing. The details of this installation are as shown in Fig. 6, and the blade holder (4) is installed by passing the guide pin (7) of the copying machine main body (6) through the elongated hole (8) and removing the pin (7a) and the puller. It is attached to the main body of the copying machine by a stopper (7b). The elongated hole (8) is provided so that its major axis is approximately in the radial direction of the photoreceptor drum, and the removal stopper (7b) is provided so that the blade holder can slide on the copying machine body (6) in the direction of the arrow. holds the blade holder. The blade is brought into contact with the photoreceptor drum (1) by the total weight of the blade and the blade holder, or by applying a constant pressure by a spring (9) indicated by the marked line in FIG. When cleaning with such a device, the impact on the photoconductor surface at the tip of the blade due to the rotational vibration of the photoconductor drum or the concavity of the photoconductor surface is not only due to the elasticity of the blade, but also due to the impact on the photoconductor drum of the blade and blade holder. The free sliding movement of the photoreceptor in the substantially radial direction ensures rapid and complete absorption, and long-term damage to the photoreceptor surface is prevented.

In the above example, the elongated hole (8) was explained, but as shown in Fig. 4, two guide plates (1) are attached to the copying machine body, and the blade holder is slidably moved between the guide plates in the direction of the arrow. It can also be made mobile.

Furthermore, when the blade and the blade holder are integrated into one member, as shown in FIG. It is also possible to provide it on the side opposite to where it comes into contact with the photoreceptor drum and apply a Teflon coating to its inner surface to enhance the lubrication effect.

According to the present invention, since the blade is slidably attached to the copying machine main body via the blade holder, even if the contact state between the photosensitive drum and the plate P varies due to mechanical stress, the plate 9 Since this sliding movement is absorbed, the surface of the photoreceptor is not damaged, and contact between the blade and the surface of the photoreceptor can be automatically achieved with high precision.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional cleaning device, FIG. 2 is a diagram showing an example of a cleaning device according to the present invention, FIG. 6 is a diagram showing details of attachment of a blade holder, and FIGS. 4 and 5 are diagrams according to the present invention. It is a figure showing other examples. Symbols in the figure = 1...Photosensitive drum, 2...Residual toner, 3...Blade, 4...Blade holder,
5... Set screw, 6... Copying machine body, 7... Guide 9 pin, (3 others, 2C) Figure 2 Figure 3 Figure 4 Figure n Figure 5

Claims (1)

[Claims] A blade-type cleaning device for an electronic copying machine including means for pressing the blade against the surface of the photoreceptor drum, characterized in that the blade is attached to the copying machine main body so as to be slidable approximately in the radial direction of the photoreceptor drum. Blade-type cleaning device for electronic copying machines.