Sheet feeding or delivering – Delivering to stack and feeding therefrom – With sheet sensor for selective location
Patent
1991-06-18
1992-01-07
Skaggs, H. Grant
Sheet feeding or delivering
Delivering to stack and feeding therefrom
With sheet sensor for selective location
271259, 355320, B65H 522
Patent
active
050783793
ABSTRACT:
A system for detecting and signaling the feeding of a complete set, stack or job of document sheets, especially for a recirculating type automatic document feeder for a copier or other document imaging system with a document restacking tray, in which normally an electromechanical sheet separator provides an end of set detection signal by mechanically operating each time the last sheet of the stack is fed. Here, the end of set detection and control signal is provided instead by a preset brief electrical signal from a non-mechanical optical no-sheet-present-in-tray detector for those documents sets having a sufficiently small number of document sheets such that all of the document sheets are temporarily in the document recirculation path after the last sheet of the set is fed out of the document tray on each circulation so that this optical sheet presence detector briefly signals that no document sheet is present in the tray, indicative that the last sheet of the small set was fed. This same preset maximum time period signal is used to automatically deactivate the regular electromechanical end of set detector for all further set circulations of that job to reduce wear and jam or set circulation miscount risks.
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Xerox Disclosure Journal, vol. 12, No. 2, Mar./Apr. 1987.
Skaggs H. Grant
Xerox Corporation
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