JPS5681863A - Electrophotographic copier for photographic film - Google Patents

Abstract

PURPOSE:To avoid the defective copy and thus ensure a copy of an appropriate pressure in case when a small-size photographing film is copied in magnification to a large-size transfer paper, by controlling the magnification ratio of copy for the magnification ratio converting optical system in accordance with the size of the transfer paper. CONSTITUTION:The size signal of the transfer paper size detecting means 28 plus the upper-lower change-over signal of the paper feed means 29 which can feed the paper in both the upper and lower stages when necessary are supplied to the deciding circuit 30. At the same time, the copy magnification ratio signal of the magnification ratio converting optical system which is set previously through the copy magnification ratio means 31 is supplied to the circuit 30. Then these signals are decided, and the coincidence signal is delivered to the copy action starting mechanism 32 from the circuit 30 when a coincidence is secured between both signals. Thus the copying is started. On the other hand, when no coincidence is obtained between both signals, the signal is delivered to the control means 33 such as the motor or the like which functions as the driving source of the optical system. Thus the means 31 is controlled, and this control is carried out continuously until a coincidence is obtained between both signals.