Browse Prior Art Database

3-ROLL CVT FOR LARGE DOCUMENTS

IP.com Disclosure Number: IPCOM000025776D
Original Publication Date: 1987-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 84K

Publishing Venue

Xerox Disclosure Journal

Abstract

In CVT arrangements such as that taught in United States Patent No. ,4,380,389 to Kingsley, handling of larger documents with slippery surfaces generally requires that spring pressure between frictional support fingers and a CVT roll be increased in order to provide a non-slip transport of the document by the CVT roll. However, the increased pressure on the roll results in increased drag on the drive motor and velocity errors which cannot be tolerated in raster inpuffoutput scanning applications.

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XEROX DISCLOSURE JOURNAL

3-ROLL CVT FOR LARGE DOCUMENTS
Jack R. Hauber

Proposed Classification
U.S. C1.355/30 Int. C1. G03b 27/48

In CVT arrangements such as that taught in United States Patent No. ,4,380,389 to Kingsley, handling of larger documents with slippery surfaces generally requires that spring pressure between frictional support fingers and a CVT roll be increased in order to provide a non-slip transport of the document by the CVT roll. However, the increased pressure on the roll results in increased drag on the drive motor and velocity errors which cannot be tolerated in raster inpuffoutput scanning applications.

To remedy this problem, an open-looped stepper motor 10 drives a CVT roll 12 having upper and lower foam idler rolls 14, 16 at the top and bottom of CVT roll 12 forming input and output nips. Idler rolls 14, 16 are respectively supported on shafts 18,20, which, in turn, are supported on roller bearings to provide a positive drive force to the document, without increasing the CVT roll frictional load on motor 10. The motor is thus kept simple. Support fingers 24, if used at all, are only a support for the document during imaging, and are not frictionally engaged with the document, preventing marring by the support fingers. The optics system in such an arrangement comprising document illuminating lamp 26, and Selfoc lens 28 directing light reflected from the scanned document to scanning arrays 30, 32 through beam splitter 34, may be located loca...