Copying apparatus provided with an automatic document feeder and a sheet

Abstract

A copying apparatus includes a circulating type original document feeder for feeding a plurality of originals from a tray, one by one, onto an exposure section. Each original is exposed to light from an optical system and an image of each original is copied onto a sheet. The apparatus also includes a counter for counting the number of originals fed from the feeder, a binding unit for binding sheets, and a controller for inhibiting the operation of the binding unit when the value counted by the counter is over a standard. The feeder may operate in a first feeding mode where each original is fed to the exposure section with only its first side facing the optical system, or in a second feeding mode where each original is fed twice to the exposure section, once with its first side facing the optical system and then once with its other side facing the optical system. The apparatus also operates in a first copying mode where each sheet is subjected to only one copying operation, and a second copying mode where each sheet is subjected to a plurality of copying operations. An operation mode is selected from a combination of one of the two feeding modes and one of two copying modes. A standard is then determined according to the selection of the operation mode in order to prevent the binding unit from receiving a number of sheets in excess of its storage capacity.