Browse Prior Art Database

PNEUMATIC PAPER SENSING SWITCH

IP.com Disclosure Number: IPCOM000027709D
Original Publication Date: 1998-Dec-31
Included in the Prior Art Database: 2004-Apr-08
Document File: 2 page(s) / 54K

Publishing Venue

Xerox Disclosure Journal

Abstract

Disclosed is the use of a pneumatic switch for sensing paper in an electrophotographic printing machine. The pneumatic switch mounts on one side of a paper path. A source of air on the opposite side provides an air stream to the switch that crosses the paper path. In the absence of paper, the switch maintains an initial ON condition. As paper travels through the paper path, it intersects the air stream and causes a pressure change at the switch. Once a sufficient amount of air is blocked, the switch toggles to an OFF condition indicative of detection.

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XEROX DISCLOSURE JOURNAL

PNEUMATIC PAPER SENSING SWITCH

Proposed James D. Walsh Classification

U. S. C1. 3991389 Int. C1. G03g 15/00

Disclosed is the use of a pneumatic switch for sensing paper in an electrophotographic printing machine. The pneumatic switch mounts on one side of a paper path. A source of air on the opposite side provides an air stream to the switch that crosses the paper path. In the absence of paper, the switch maintains an initial ON condition. As paper travels through the paper path, it intersects the air stream and causes a pressure change at the switch. Once a sufficient amount of air is blocked, the switch toggles to an OFF condition indicative of detection.

Pneumatic sensing does not physically protrude into the paper path as do some other mechanical actuators. Thus, there are no actuators to wear, jam or cause damage to paper traveling through the path. The air stream provides less of a force on the traveling paper when higher forces have been known to adversely affect the paper. Unlike optical sensors, the pneumatic sensor does not toggle erroneously due to paper dust contamination or yield false signals on transparencies or lightweight papers.

DP.5797

XEROX DISCLOSURE JOURNAL - Vol. 23, No. 6 NovemberDecember 1998 289

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290 XEROX DISCLOSURE JOURNAL - Vol. 23, No. 6 NovemberDecernber 1998

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