Browse Prior Art Database

LOW FORCE SWITCH

IP.com Disclosure Number: IPCOM000025084D
Original Publication Date: 1983-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 79K

Publishing Venue

Xerox Disclosure Journal

Abstract

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.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 77% of the total text.

Page 1 of 2

XEROX DISCLOSURE JOURNAL

LOW FORCE SWITCH Edward Vipond Lawrence Herko

Proposed Classification
U.S. Cl. 200/51R Int. C1. HOlr 13/70

FIG: I

Volume 8 Number 4 July/August 1983 303

[This page contains 1 picture or other non-text object]

Page 2 of 2

LOW FORCE SWITCH (Cont'd)

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.

Figure 1 illustrates a specific embodiment with a light emitting diode 10, a phototransistor 12, in a housing 14 and a plastic flag 16 where the flag is pivoted between the source and the detector and is designed to decrease its force on the paper as the paper moves through it. This allows the switch forces, actuatiodde- actuation points and operator mode to be tailored just by changing the c...