An inverting document feeder feeds a document from the document tray to the position where the image reader reads the document, turns the document over, and then reads the second side. Document size determination sensors detects the document passing through, and determines the size of the document from...http://www.google.com/patents/US6081687?utm_source=gb-gplus-sharePatent US6081687 - Copying machine provided with an image reading apparatus for scanning moving documents
