Browse Prior Art Database

MULTIFEED DETECTION SYSTEM FOR DOCUMENT AND PAPER HANDLING

IP.com Disclosure Number: IPCOM000027211D
Original Publication Date: 1995-Oct-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 117K

Publishing Venue

Xerox Disclosure Journal

Abstract

Recirculating document handlers identify multiple sheet fees by comparing the document count between the successive passes required for pre-collation machine configurations. Electronic reprographic machines, having scan and store capability, require only a single set in order to produce an unlimited number of print sets. The failure to detect a multiple sheet feed with such machine can result in loss of job integrity in that many sets would be printed with a missing page. Since multi-feeds are commonly coincidental, especially in vacuum corrugation feeds, it would be desirable to provide a detection system in which sheets are separated downstream of a feeder to enable detection as an overlength sheet by a pre-existing arrangement of sensors and jam detection logic.

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

MULTIFEED DETECTION SYSTEM Proposed Classification FOR DOCUMENT AND PAPER
HANDLING
Int. C1. B65h 7/02

US. (21.2711259

Mark A. Walpert

PS

J"

ps \728 - 20

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11

PLATEN

XEROX DISCLOSURE JOURNAL Vol. 20 No. 5 SeptembedOctober 1995 415

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

Page 2 of 4

MULTIFEED DETECTION SYSTEM FOR DOCUMENT AND PAPER HANDLING (Cont'd)

Background

Recirculating document handlers identify multiple sheet fees by comparing the document count between the successive passes required for pre-collation machine configurations. Electronic reprographic machines, having scan and store capability, require only a single set in order to produce an unlimited number of print sets. The failure to detect a multiple sheet feed with such machine can result in loss of job integrity in that many sets would be printed with a missing page. Since multi-feeds are commonly coincidental, especially in vacuum corrugation feeds, it would be desirable to provide a detection system in which sheets are separated downstream of a feeder to enable detection as an overlength sheet by a pre-existing arrangement of sensors and jam detection logic.

Description of a Preferred Embodiment

Referring to the drawing a partial, schematic view of a document handler is shown. The document handler includes a vacuum corrugation feeder, in which stack pressure, represented by the arrow arrays 12A and 12B is applied to sheets 14 and 16. As shown in the drawing, the document handler includes a pair of deskew rolls 18 and take away rolls 20. The take away rolls 20 include a retard roll 22 and a drive roll 24. As will be explained in further detail below, multi-feeds are monitored through use of sensors 28 and 30 which are represented by respective arrows.

A preferred mode of operation i...