Electrophotographic copying machine

Claim 1

An electrophotographic copying machine including a rotatable body of photosensitive material; an original receptacle for placing an original thereon; and a charger, an exposure unit, a developing unit and a transfer unit arranged in sequence around the periphery of the rotatably body along the direction in which the body is rotated, said charger being effective to charge the body when it is desired to obtain a copy, said exposure unit being effective to provide an exposure of an original placed on a predetermined surface of the original receptacle and projecting an image thereof onto the body to form an electrostatic latent image thereon, the developing unit being effective to develop the latent image with a toner, the transfer unit effecting a transfer of the developed toner image on the body onto one surface of a transfer sheet supplied thereto; and a fixing unit for fixing the transferred image on the transfer sheet; characterized in that the original receptacle has a first and second surface for placing a pair of originals thereon and is movable so as to selectively bring the first or second surface into a predetermined position, and that a second transfer unit is arranged around the periphery of the body at a position beyond the developing unit as viewed in the direction of rotation of the body, the machine being adapted to effect a two cycle copying operation wherein in the first cycle, an original placed on the first surface is copied on a first surface of a transfer sheet, which sheet is conveyed to and retained in said fixing unit until during the second cycle, a Developed image of an original placed on the second surface of the original receptacle is formed on the body, whereupon the transfer sheet retained in the fixing unit is supplied to the second transfer unit for bringing its second surface into operative association with the developed image on the body.