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LOW FORCE SWITCH Disclosure Number: IPCOM000025084D
Original Publication Date: 1983-Aug-31
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal


A jam switch in a copier must be capable of accommodating both light weight and heavy weight papers. The jam switch and actuator must not apply too much force on light weight papers so as to deform or buckle the sheet, for example, upon exiting a copier and causing a jam. A low force switch for use with both light and heavy weight papers includes a light source, photodetector with the beam between the two being broken by a pivotable flag. The light source may, for example, be a light emitting diode, an incandescent light or a light pipe and the photodetector may be a phototransistor, photovoltaic cell or cadmium sulfide type cell. The flag, which may be of a light weight material, is opaque to the specific light source/photodetector used and could be designed to give an open, closed or motion sensing signal.