Browse Prior Art Database

DOCUMENT FLATNESS DEVICE

IP.com Disclosure Number: IPCOM000026963D
Original Publication Date: 1994-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 93K

Publishing Venue

Xerox Disclosure Journal

Abstract

Proposed is a device that assures flatness for an original document delivered to an imaging station by a document handler using wide friction belt technology. The proposed device makes certain that the flatness of the document is within the focal plane of an optical system used in an electrophotographic printing machine.

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XEROX DISCLOSURE JOURNAL

DOCUMENT FLATNESS DEVICE Classification Proposed Kiri B. Amarakoon U.S. C1.355/308

Int. C1. G03g 21/00

39

30

XEROX DISCLOSURE JOURNAL - Vol. 19, No. 4 July/August 1994 329

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DOCUMENT FLATNESS DEVICE(Cont'd)

Proposed is a device that assures flatness for an original document delivered to an imaging station by a document handler using wide friction belt technology. The proposed device makes certain that the flatness of the document is within the focal plane of an optical system used in an electrophotographic printing machine.

A conventional document handler 10 having a wide friction belt 2 is shown in the accompanying Figure. Document handler 10 includes a frame 18 to which a drive roll 22 and an idler roll 24 are attached at opposite ends. Belt 2 is entrained about rollers 22,24,27,28, and 29. The belt has sufficient tension to provide a normal force on drive roll 22 to drive belt 2 without slippage caused by an interfering frictional drag from platen glass 26. Rollers 27, 28, and 29 are placed at appropriate intervals along the bottom inside surface of belt 2 to drive a document, in the direction of arrow 39, over platen glass 26.
Under normal circumstances, where the platen glass 26 has a sufficient depth of focus for the optical system, rollers 27, 28, and 29 are sufficient to keep an original document flat against the glass. When the platen glass has a limited focal dept...