Duplex copying machine

摘要

A duplex copying machine has an auto document feeder and is capable of duplex copying from originals having images on one side, originals having images on both sides and combinations of the aforementioned two types. In a preferred embodiment of the duplex copying machine, whether an original has images on one side only or on both sides is detected so as to obtain a duplex copy from a duplex original and a one-side copy from a one-side original.