Abstract: A slit exposure device movable back and forth in a path parallel to a stationary original for projecting an image of the original in linear portions onto a moving photosensitive element in belt form has a lamp for illuminating the original, an optical system, at least two interconnected belt deflecting rollers and a drive for moving these rollers with the optical system along and parallel to the object plane. At least one of the deflecting rollers deflects the photosensitive element counterclockwise and at least one of them deflects it clockwise from its original direction of movement, and the optical system projects the image in linear portions onto the photosensitive element at a location within the path formed by and between the deflected portions of the photosensitive element.

Abstract: A copying apparatus provided with a system for transferring electrostatic or powder images from a moving image supplying surface to a moving intermediate surface for temporary retention on the latter, wherein the respective supports of the surfaces are pressed together during image transfer and are kept apart at other times, is made with an arrangement which assures synchronized movement of the two surfaces for image transfer by driving the supports at slightly different speeds yet causing one of them to be driven by friction with the other, precisely at its speed, while and at the location where the surfaces are pressed together for image transfer.