Browse Prior Art Database

CROSS ROLL DUAL NORMAL FORCE

IP.com Disclosure Number: IPCOM000025679D
Original Publication Date: 1987-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 76K

Publishing Venue

Xerox Disclosure Journal

Abstract

In an electrophotographic printing machine, it is frequently necessary to properly align a sheet against a registration edge. The wide variation in sheet beam strength and the angle with respect to gravity that the sheet moves increases the difficulty of achieving proper edge registration. Presently, rubber drive rolls, angled toward the registration edge, move sheets toward the registration edge while at the same time drive the sheet to the next nip in the sheet path. An idler roll is springloaded against the rubber roll which provides the normal force required to drive the sheets through the system. The drive force must not exceed the buckling force of the sheet. Because of

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Page 1 of 2

XEROX DISCLOSURE JOURNAL

CROSS ROLL DUAL NORMAL FORCE
Anthony Ilacqua
Raymond A. Naramore

Proposed Classification

U.S. C1.271/245 Int. C1. B65h 9/04

f l8 f l6

Volume 12 Number 2 March/April 1987 77

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

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CROSS ROLL DUAL NORMAL FORCE (Cont'd)

In an electrophotographic printing machine, it is frequently necessary to properly align a sheet against a registration edge. The wide variation in sheet beam strength and the angle with respect to gravity that the sheet moves increases the difficulty of achieving proper edge registration. Presently, rubber drive rolls, angled toward the registration edge, move sheets toward the registration edge while at the same time drive the sheet to the next nip in the sheet path. An idler roll is springloaded against the rubber roll which provides the normal force required to drive the sheets through the system. The drive force must not exceed the buckling force of the sheet. Because of

. the relatively high stiffness and mass of heavier sheets versus lighter weight sheets, the normal force required to handle the wide range of sheets cannot remain constant. The normal force required to move the heavier weight sheets against the registration edge and onto the next nip is greater than the force required to buckle lighter weight sheets. Thus, the normal force must be adjusted. This may be achieved by the arrangement shown in the drawing. As depicted, sheets travel in the directi...