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MECHANICAL MULTIFEED DETECTOR

IP.com Disclosure Number: IPCOM000027812D
Original Publication Date: 1999-Dec-31
Included in the Prior Art Database: 2004-Apr-09
Document File: 2 page(s) / 79K

Publishing Venue

Xerox Disclosure Journal

Abstract

Proposed is a mechanism designed to prevent multifeed sheets from leaving an electrophotographic copier or printer. The mechanical multifeed detector is simple in Xerox Disclosure Journal - Vol. 24, No. 6 November/December 1999 257

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XEROX DISCLOSURE JOURNAL

MECHANICAL MULTIFEED DETECTOR

Lawrence R. Benedict Carl H. Hall

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Proposed Classification
U. S. C1. 355/308 Int. C1. G03g 21/00

FIG. 7

FIG. 2

Proposed is a mechanism designed to prevent multifeed sheets from leaving an electrophotographic copier or printer. The mechanical multifeed detector is simple in

Xerox Disclosure Journal - Vol. 24, No. 6 November/December 1999 257

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MECHANICAL MULTIFEED DETECTOR (Cont'd)

design. It contains no electrical parts and can handle all types of paper stocks with no adjustments.

Figure 1 shows a mechanical multifeed detector 10 having a set of drive rolls 16 mounted to a shaft 18, and a set of idler nip rolls 12 mounted to a shaft 14. These rolls should be mounted as close to the machine's exit as possible and preferably after a static eliminator, but before the last exit sensor. The spacing A of the idler rolls 12 should not be equal to the width of any of the feeders in the machine. Both the drive rolls 16 and the idler rolls 12 must be coated with a high friction elastomer (preferably the same material). Drive rolls 16 are driven at the same speed as the rest of the paper path. The idler rolls 12 are spring loaded (not shown) against the drive rolls 16 as well as being connected to a friction drag brake (not shown) having a torque T such that:

FPP*N*R c T < FPR*N*R,

where:

FPR is equal to the coefficient of friction for paper to rubber;...