Patent ID: 6920305

Claim:
A photoreceptor medium cleaning device eliminating a remaining developer from an outer surface of a photoreceptor medium after a developed image of a developer is transferred from the photoreceptor medium to a transfer unit in an electrophotographic image forming apparatus, the photoreceptor medium cleaning device comprising: a plurality of magnets each of which is installed in a lengthwise direction of the photoreceptor medium and is separated from the outer surface of the photoreceptor medium and to which magnetic fluids filling spaces between the outer surface of the photoreceptor medium and the magnets are attached; and blocking blades which are disposed at corresponding ones of borders between an image region and non-image regions of the photoreceptor medium and at both sides of each of the magnets so that the developer remaining on the outer surface of the photoreceptor medium is prevented from flowing over the photoreceptor medium into the corresponding non-image regions.