PAPER PATH SENSING METHOD
Original Publication Date: 1997-Oct-31
Included in the Prior Art Database: 2004-Apr-08
Xerox Disclosure Journal
Disclosed is method for sensing the direction and status of cut sheet paper motion in a paper path, for example, as found in electrophotographic and liquid printing machines for document handling apparatus, such as, bin sorters, document feeders, and recirculating sheet handlers. The sensing method comprises providing two, double beam optical emitteddetector, sensors, spaced apart, in amounts less than the width or length of the document sheet, and situated in a paper train in the process or paper travel direction. The sheet position and direction of travel can be determined by a beam break detection sequence wherein the combined signals from the two sensors indicate a jam or open condition in the paper train. The method provides a simple means for monitoring, early detection and intervention in paper path transport problems, and potential jam conditions, in complex paper handling systems.