DE2030962C3 - Cleaning device for electrophotography - Google Patents

Description

The invention relates to a cleaning device for electrophotography with a rotating Cleaning brush that removes toner from a reusable photosensitive layer and with wiping elements that wipe off the toner in the cleaning brush.

In the case of electrc "hotographic processes, the after the actual process steps of charging, exposure and image transfer The toner adhering to the photosensitive layer is removed by means of a brush in the direction of the Remigungsck. the Toner then adhering to the brush of the cleaning device is then removed by means of a rod or rod-shaped stripping device, for example from that in U.S. Pat. No. 2,751,616 illustrated kind, matured. Such stripping devices however, have the disadvantage that the bristles of the brush spring off from it and thereby flinging the toner around, whereby the light-sensitive Layer is contaminated again.

In contrast, the invention is an improved device for cleaning a removal of brush attached to the photosensitive layer in electrophotography of stuck toner.

The cleaning device according to the invention for a rotating cleaning brush in an electrophotographic machine The copier has a cleaning brush that runs parallel to the shaft of the rotating cleaning brush rotatable shaft and several opposite the oh «? This shaft is attached to the shaft at an incline Disks which m> t part of their edge between the bristles of the brush protrude and, due to their tumbling motion when the shaft rotates, the Remove stuck toner with the rotating brush.

When rotating the discs do ι
Brush in contact H ih ^ -

compared to axial movements, Ji. ici

the rotation of the discs <1.!. η. η

Toi r adhering to the brush. * ί, _π ι-,
come the disc edges u> h!.

stir with the bristles of is, π u; ■
gradually moved away from it, so,! .. ί ^;
Bristles in contrast to the bek.m <ι

Do not rebound violently or the toner will not be thrown around.

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

F i g. 1 shows a plan view of an exemplary embodiment the invention,

F i g. 2 is a side view from the left of FIG. 1 and

ίο Fig.? a representation to explain the angular positions of the disks with their changes when the shaft rotates.

A drum 3 carrying the reusable photosensitive layer, for example with a

Selenium coating, is rotatably supported by its shaft 2 in bearings 1 and rotates in the direction of the arrow (Fig. 2). A cleaning brush 4 is rotatably mounted with its shaft 6 in bearings S and rotates below In contact with and in the same direction as the drum 3,

ao 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

supply brush 4 is arranged laterally next to the brush 4. The cleaning device 7 has a rotatable Metal shaft 9 mounted in bearings 8, with several arranged thereon at an angle to its axis Discs lo which with parts of their edges between the bristles of the cleaning brush 4 and protrude touch this. The cleaning device 7 is formed from the gear wheels 11 and 12 and 13 Gear set driven in the same direction as the cleaning brush 4, so that a high relative

speed between the brush and the cleaning device 7 arises. The disks 10 are made of metal, plastic material or the like, and preferably of aluminum sheet, that is to say altogether of a material which is harder than the bristles of the Re ^; ■ straightening brush 4.

The angular positions of the discs 10 with respect to the cleaning brush 4 are shown in FIG. 3 can be seen. Here, the disk 10 is initially assumed to be inclined to the left (FIG. 3 a). When rotating

of the disk by 90 °, the angular position of the disk 10 relative to the cleaning brush 4 changes so far that the corresponding radius 1 of the disk 10 is now perpendicular to the axis of the shaft 9 (FIG. 3 b). If you turn it further by 90 ^c,

melts the disc 10 to the right (Fig. 3c). With again Further rotation by a further 90 ° in turn runs a radius 1 of the disk 10 perpendicular to the Axis of the shaft 9 (Fig. 3d), and when rotating a further 90 ° the disk 1Θ returns to its starting position (Fig. 3e).

That the discs 10 ■ "^ e angular position relative to the brush 4 g in the dimensions of the dashed representation in F i is apparent from the above change 1, as they not only rotate, but because" ¹ η - Ta,:;. Nelbewr ■ ■; · ■■ ' % · / \ ιι> vif 1 ^! : ^! *

■ ir ·. H

.H

'Ig

l'f

ntf <men <! ». '
'λοι.ι attack
- I)! Wink

and the lift-off from these occurs only very gradually. Thus the movement of the bristles resembles one slow peristaltic movement. The bristles of the cleaning brush 4 are therefore not suddenly bent down and released again. As a result, the bristle tips of the brush 4 are severely worn avoided, and the toner scraped off by the brush 4 falls smoothly along the side surfaces of the Discs 10 and will not be thrown around.

As can be seen from the description above, the invention provides a device for cleaning a reusable photosensitive device Layer in an electrophotographic process of adhering toner, with a rotating Cleaning brush for removing the torper from the photosensitive layer and a device for cleaning the brush of sticking toner with several at an angle to this on one rotatable shaft arranged disks with parts of their edges between the bristles of the brush protrude, so that the toner adhering to the brush by the circumferential and axial movement of the Schejbenränder can be wiped off. This is where the sudden Avoid bending down and springing back of the bristles, thereby preventing the Effectively prevented toner.

1 sheet of drawings

Claims (1)

Claim: Cleaning inspection for the electrophotographic with a rotating cleaning brush that removes toner from a reusable, light-sensitive layer removed, and marked with Abstreifemcnten, which wipe off the toner in the cleaning brush from this by a rotatable shaft (9) running parallel to the shaft (6) of the rotating brush (4) and by several on this shaft (9) at an angle to this attached discs (10), which with part of its edges can be inserted between the bristles of the rotating cleaning brush (4) and can be placed against them, so that when rotating d:. * r disks (10) adhere more closely to the rotating brush Toner can be wiped off by the circumferential and axial movement of the disks (10) is.