Browse Prior Art Database

Original Publication Date: 1980-Jun-30
Included in the Prior Art Database: 2004-Apr-02

Publishing Venue

Xerox Disclosure Journal


When reproducing a multiple-page document, it is desirable to collate the pages so that after reproduction they are in the same order as in the original document. The described document feeder accomplishes this objective. A document, the bottom sheet in a collated stack of documents for example, is fed face up into document chute 10 to a document wait station, the drive pinch rolls 11 are open and the input register gate 12 is in the up or closed position. As the document is inserted, it trips the switch 13 and the drive rolls engage the document as the register gate 12 drops from the paper path permitting the document to be fed in a forward direction. The document is driven by drive rolls 11 around an arcuate pair of turnaround guides 15 over the fixed registration edge 16 onto the copying platen 17. The document is driven in a forward direction by endless belt 18 wrapped around drive rolls 19 and 20 and maintained in driving contact with the document on the platen by input driven roll 21 and output drive roll 22. When the trailing edge of the document passes the fixed registration edge 16, the drive of the document belt 18 is stopped and reversed and the document is driven in a reverse direction to register the trailing edge of the document against the fixed registration edge 16. After registration, the document belt 18 is stopped and the document is copied. When copying is completed, the document belt is again energized in a forward direction and the document is driven forward off the platen 17 around arcuate turnaround guides 26 into output stacking tray 27. Driven roll 28 insures that even short documents are driven into the output tray, which stacks successive documents face up with the bottom sheet on the bottom when the bottom sheet of the document set is the first sheet fed to the document feeder.