SHEET BINDING PROCESSING APPARATUS AND IMAGE FORMING SYSTEM HAVING THE SAME

摘要

A sheet binding processing apparatus including a processing tray (37) , a sheet positioning device (38, 39), a first binding device (47), a second binding device (51), a driving device which moves the second binding device to a binding position where the sheets positioned by the sheet positioning device are to be bound and to a retracting position for retracting to the outside of the sheets positioned by the sheet positioning device, and a controller (95) which controls the driving device and causes the second binding device to be located at the retracting position when the first binding device binds sheets.