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Browse Prior Art Database

CAPACITIVE MULTIFEED SENSOR

IP.com Disclosure Number: IPCOM000025250D
Original Publication Date: 1984-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 92K

Publishing Venue

Xerox Disclosure Journal

Abstract

One way to produce high reliability xerographic copying and printing machines is, of course, to improve the reliabilities of all the individual subsystems. However, it is likely that at some point this becomes too costly. At that point, it would be desirable to detect whatever failure has occurred and have the operator take corrective action before the failure can propagate through the machine. Multi-feeds, i.e., the feeding of more than one sheet of paper at a time, is an example of a failure which, if detected early enough, could be prevented from propagating beyond the feed station and producing, for example, a jam in detack. In duplex machines, multifeeds can wreak havoc without ever producing jams by scrambling the proper sequence. Clearly, it would be desirable to detect multifeeds and elicit operator intervention while such intervention would be simple.

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

CAPACITIVE MULTIFEED SENSOR Donald R. Lehmbeck
Martin E. Banton

Proposed Classification
U.S. C1. 271/262 Int. Cl. R65h 7/12

\? GROUNDED METAL

ROLLER (SERVES AS OPPOSITE CAPACITOR PLATE

\

1. Volume 9 Number 2 March/April 1984 17

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CAPACITIVE MULTIFEED SENSOR (Cont'd)

One way to produce high reliability xerographic copying and printing machines is, of course, to improve the reliabilities of all the individual subsystems. However, it is likely that at some point this becomes too costly. At that point, it would be desirable to detect whatever failure has occurred and have the operator take corrective action before the failure can propagate through the machine. Multi- feeds, i.e., the feeding of more than one sheet of paper at a time, is an example of a failure which, if detected early enough, could be prevented from propagating beyond the feed station and producing, for example, a jam in detack. In duplex machines, multifeeds can wreak havoc without ever producing jams by scrambling the proper sequence. Clearly, it would be desirable to detect multifeeds and elicit operator intervention while such intervention would be simple.

This proposal suggests one way to detect multifeeds. Referring to the drawing, the copy sheet is passed through a pair of capacitor plates 5, 6, whose separation is determined by the thickness of the copy sheet or sheets 7. In many machines this could be accomplished by modifying a set of existing copy sheet transporting rollers 8, 9 so a...