Document reading device and image forming apparatus

Abstract

A document reading device includes an image reading part, a document conveying part, an operation display part, an overlap detecting part and a controlling part. The overlap detecting part detects overlap of a document conveyed to the image reading part. When the overlap detecting part detects the overlap, if an overlap image corresponding to the overlap in the image data obtained by the image reading part matches with a predetermined preservation image, the controlling part decides that the overlap is not double feed to continue the scanning operation. If the overlap image does not match with the predetermined preservation image, the controlling part decides that the overlap is the double feed, stops the scanning operation, and, if user judgement that the overlap is not the double feed is inputted in accordance with operation of the operation display part, stores the preservation image on the basis of the overlap image.

Dependencies are inferred from the claim text.