Electrophotographic copying apparatus

摘要

An electrophotographic copying apparatus of the slit exposure type which includes a scanning box having image forming elements such as a photoreceptor drum, a corona charger, an optical system, and a transfer member, etc. incorporated therein. The photoreceptor drum is rotated in synchronization with the movement of the scanning box, while copy paper is transported by the direction of movement of the scanning box at a speed equivalent to the sum of the moving speed of the scanning box and the circumferential speed of the photoreceptor drum for causing the copy paper to contact the photoreceptor surface in synchronization with each other so that the image of an original formed on the photoreceptor surface is transferred onto the copy paper. The optical system includes an illuminating device which directs light rays toward the original being copied and also at a position on the photoreceptor surface following image transfer for erasing the residual charges remaining on the photoreceptor surface.