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

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