Image forming apparatus for copying one and two-sided documents

An image forming apparatus comprising:

• (a) feeder means for feeding one by one a plurality of mixed documents including one-sided image documents and two-sided image documents to a reading station for copying said mixed documents on a plurality of recording sheets;
• (b) discriminating means for discriminating whether each of the plurality of mixed documents is one of a one-sided image document and a two-sided image document;
• and
• (c) means for selecting a copying mode so that the plurality of mixed documents are copied in one of a one-sided copying mode wherein all images of the plurality of mixed documents are respectively copied on only one side of each of the plurality of recording sheets, a two-sided copying mode wherein all images of the plurality of mixed documents are copied on two sides of each of said plurality of recording sheets, and another copying mode wherein the images are copied in an order that corresponds to an order of the images on the plurality of mixed documents in accordance with a predetermined desired copying mode;
• and
• wherein when the two-side copying mode is selected by said selecting means and when said discriminating means discriminates an absence of an image on one side of a document, one-sided copying for said one side of said document is inhibited.