An electrophotographic copying machine of a transfer type has a capability of reproducing an image on a copying paper selectively at a plurality of magnifications and also a capability of feeding copying papers of different sizes. The machine comprises a plurality of timers of a first group operable in common to all of modes of operation of the machine and a plurality of timers of a second group operable during a particular mode of operation, these timers of the first and second groups being sequentially controlled by a microcomputer.