DE2030962A1 - Cleaning device for the photosensitive layer in electrophotography - Google Patents

Description

DR. BERG DIPL.-ING. STAPF

PATENTANWÄLTE θ MUNICH 2, HILBLESTRASSE

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_DQlum June 23, 1970

Lawyer files Mr. 19 734

Kabushiki Kaisha Ricoh! Tokyo / Japan

Cleaning device for the light-sensitive sole in electrophotography

The invention relates to a device for cleaning the reusable photosensitive layer in the Electrophotography of adhering toner, especially for Cleaning the brush of the cleaning device.

In the case of electrophotographic processes, the Process steps of charging ». Exposure

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and the image transfer still on the photosensitive Layer adhering toner by means of a brush of the cleaning device removed. The toner that then sticks to the brush of the cleaning device is then * by means of a rod or rod-shaped stripping device, for example from that in the USA patent 2 751 616 explained type, stripped. Such Abstreifeinriehtungen however, have the disadvantage that the borates of the brush spring off from it and thereby the Throwing toner around, contaminating the photosensitive layer again. '

In contrast, the invention is intended to provide an improved. Facility for cleaning a toner adhered to the photosensitive layer in electrophotography Use the brush to remove the toner sticking to it.

The cleaning device according to the invention for a rotating Cleaning brush in an electrophotographic copier, has one parallel to the rotating wells Cleaning brush running rotatable shaft and several disks attached to the shaft at an incline with respect to the axis of this shaft, which disks with part of their Edge · protrude between the bristles of the brush and remove the toner adhering to the rotating brush by their tumbling motion as the shaft rotates.

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As the discs rotate, their brushes lead in Contact standing hand parts of these opposite axial movements, which together with the rotary movement of the discs cause the toner adhering to the brush to be removed. The edges of the disc come into contact with the bristles of the brush only gradually and become gradually moved away from it, so that the bent bristles are not violent in contrast to the known device spring back to prevent the toner from being thrown around. ,

The above and further features and advantages of the invention emerge in detail from the following description of an embodiment based on the drawing. In this is

Pig «1 is a plan view of an embodiment of FIG invention

Pig. Figure 2 is a left side view of Pig. I and

Pig. 3 shows an illustration to explain the angular positions of the disks with their changes when the shaft rotates.

A photosensitive layer which can be used repeatedly

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supporting drum 3, for example with a selenium coating, is rotatably mounted with its shaft 2 in bearings 1 and rotates in the direction of the arrow (Fig. 2). One Cleaning brush 4 is rotatably mounted with its shaft 6 in bearings 5 and rotates with contact and in the same direction with the drum 3 »so that a high relative peripheral speed arises. The bristles of the brush can be made of rabbit fur, feathers or untwisted silk be made.

A device 7 for cleaning this cleaning brush is arranged laterally next to the brush 4. The cleaning facility 7 has a metal shaft 9 rotatably supported in bearings 8, with several at an angle to its axis disks 10 arranged thereon, which protrude with parts of their edges between the bristles of the cleaning brush 4 and touch them. The cleaning device 7 is via a gear set formed from the gear wheels 11 and 12 and 13 driven in the same direction as the cleaning brush 4, so that there is a high relative speed between the brush and the cleaning device 7. The disks 10 are made of metal, plastic material or the like., and preferably made of aluminum sheet, so overall made of a material which is harder than the bristles of the Cleaning brush 4.

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The angular positions of the discs 10 relative to the Brush 4 are made from Pig. 3 can be seen. Here, the disk 10 is initially assumed to be inclined to the left (Pig, 3-a). When the disk 10 is rotated by 90 °, the angular position of the disk 10 relative to the cleaning brush 4 changes to such an extent that the corresponding radius _t the disk 10 now runs perpendicular to the axis of the shaft 9 (Pig. 3-b). If you turn it further by 90 °, the - Disk 10 to the right (Pig. 3-c). When turning again A radius J again runs another 90, the disk perpendicular to the axis of the shaft 9 (Pig · 3-d), and when it rotates the disk 10 returns to its starting position by a further 90 ° (Pig. 3-e).

From the foregoing it can be seen that the disks their angular position relative to the brush 4 to the extent of the dashed representation in Pig. 1 change, since they not only rotate, but also perform an axial wobbling movement with respect to the cleaning brush 4 in contact with it. As a result of this circumferential and axial movement of each of the disks 10, complete removal of the toner adhering to the brush 4 and its falling off by its own weight can be achieved. The angle of the disc 10 with respect to the cleaning brush changes to such an extent that the application of the bristles and the lifting of them only very gradually

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he follows. Thus the movement of the bristles resembles a slow peristaltic movement. The bristles of the cleaning brush 4- are not suddenly bent down and released again. As a result, there is heavy wear and tear the bristle tips of the brush 4 avoided and that of the Brush 4 stripped toner falls smoothly along the side Surfaces of the disks 10 and is not thrown around. ■

As can be seen from the foregoing description, the invention provides an apparatus for cleaning a repetitive usable photosensitive layer in an electrophotographic process of adhering toner, with a rotating cleaning brush for removing the toner from the photosensitive layer and a device for Cleaning the brush of adhering toner with several arranged at an angle to this on a rotatable shaft Discs with parts of their edges protruding between the bristles of the brush, so that the toner adhering to the brush due to the circumferential and axial movement of the. Disc edges can be wiped off. Thereby the sudden bending down becomes and springing back of the bristles is avoided, thereby effectively preventing the toner from being flung around.

Claim:

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Claims (1)

Claim: Cleaning device for a rotating cleaning brush that removes the toner in an electrophotographic process a reusable photosensitive layer removed, characterized by a parallel to the shaft (6) the rotating brush (4 ·) extending rotatable shaft (9) and through several on this shaft (9) at an angle to this attached disks (10), which with part of their edges between the bristles of the rotating cleaning brush (4) can be inserted and placed against them, so that when the disks (10) rotate, the rotating Brush 'sticky toner through the circumferential and asrial Movement of the discs (10) can be wiped off. 009884/1908 Blank page