Browse Prior Art Database

FADEOUT CONTROL FOR UNDERSIZED DOCUMENTS

IP.com Disclosure Number: IPCOM000026440D
Original Publication Date: 1992-Feb-29
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 135K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a reprographic system, a common problem caused by copying non-standard size documents is the production of copies having undesirable black or grey border areas. Generally, these areas arise when the original document is smaller that the standard output copy size and the document is copied in an open platen mode. Although the problem may be alleviated by shifting and magnifyingheducing the document image, this generally takes additional time and effort on the operator's part.

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XEROX DISCLOSURE JOURNAL

FADEOUT CONTROL FOR Proposed Classification UNDERSIZED DOCUMENTS U.S. C1.355/218 Michael E. Beard
Irwin Wagman

Int. Cl. G03g 21/00

Pitch - Doc. Mag n if ication

- COOV

Copy Width Ratio

Length uoc. I Width I I Leng<h ,

Side Edge Bottom Edge Fadeout Fadeout Control Control

On/Off Fadeout Control Direction Step Pulses

1141

    I I Control I Cont

J / I I I

/ I

--

I 6-1 13"y ,---I

I

I

XEROX DISCLOSURE JOURNAL - Vol. 17, No. 1 January/February 1992 9

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

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FADEOUT CONTROL FOR UNDERSIZED DOCUMENTS(Cont'd)

In a reprographic system, a common problem caused by copying non-standard size documents is the production of copies having undesirable black or grey border areas. Generally, these areas arise when the original document is smaller that the standard output copy size and the document is copied in an open platen mode. Although the problem may be alleviated by shifting and magnifyingheducing the document image, this generally takes additional time and effort on the operator's part.

Accordingly, the present invention is directed toward a pair of semi- independent apparatus which would alleviate or remove the unexposed border regions on the copy that are generated by the copying of non-standard sized documents. More particularly, the present invention uses software control to determine the actual image area of the original document, and then causes the erasure (exposure) of areas outside of the original image area. The figure, illustrates schematically the software and hardware systems, 12 and 14, respectively, which are used to implement the present invention. Referring to the figure, Side Edge Fadeout Control block 20 receives as inputs the pitch of the photoreceptor, the width of the copy sheet, the width of the .document and the magnification ratio. Subsequently, block 20 determines the actual size of the image that will be exposed on the photoreceptor in the process direction (normal to the plane of...