Copying machine for copying a one-side subject copy on both sides of a

Abstract

A copying machine capable of continuously copying two or more one-side subject copies on both sides of copying sheets, includes a rotary drum housing (32) for passing two or more subject copies through a light scan window (43) of an optical system (35), a paper cassettes (52) disposed in the rotary drum housing for feeding the copying sheets to the optical system, a reversing roller (62) coupled to the rotary drum housing for reversing the copying sheets having images formed by the optical system on one sides, a middle tray (55) coupled to the rotary drum housing for refeeding the reversed copying sheets to the optical system, sensors (S1-Si) connected to the rotary drum housing for detecting a number of the subject copies passing through the rotary drum housing, and a microcomputer (103) connected to the rotary drum housing for controlling the rotary drum housing so that the subject copies pass through the light scan window of the optical system sequentially in circulation from a final page to a first page. The control unit includes a rotary drum (76) for copying the final subject copy, one previous subject copy with respect to the final subject copy, and every other subject copy following the previous subject copy on the copying sheets sequentially fed from the paper cassettes at a first circulation in case of the numbers of the subject copies detected by the sensors are odd.