Browse Prior Art Database

Paper Path Switch

IP.com Disclosure Number: IPCOM000048523D
Original Publication Date: 1982-Feb-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 22K

Publishing Venue

IBM

Related People

Clark, WD: AUTHOR

Abstract

A resilient conductor brush is positioned over an electrically conductive paper path guide to detect passage of a nonconductive medium.

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Paper Path Switch

A resilient conductor brush is positioned over an electrically conductive paper path guide to detect passage of a nonconductive medium.

Conductive fibers 10, such as stainless steel or the like, are held together by conductive base 12. Fibers 10 brush against and establish electrical contact with conductive backing plate 15. Plate 15 also forms the guide for paper path or the like. Documents introduced as indicated by arrow 16 force flexible strands against the end of upper paper guide 20 into a partially deflected position. Thus, brush 10 tends to keep the leading edge of a nonconductive medium 16 against the guide 15 while nonconductive medium 16 breaks the electrical circuit contact between plates 15 and brushes 10. After passage of medium 16, strands 10 return to their circuit-completing position, as shown. The device provides a relatively inexpensive detector switch for such usages as paper-entry detection or the like

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