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DECURLER APPARATUS FOR REDUCING CROSS CURL IN SHEETS

IP.com Disclosure Number: IPCOM000027250D
Original Publication Date: 1995-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 4 page(s) / 233K

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure relates generally to a printing unit or processor, such as, an office copier, facsimile or non-impact printer, and more particularly concerns an apparatus for decurling sheet material employed therein.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 46% of the total text.

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I I 1

I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I

XEROX DISCLOSURE JOURNAL

DECURLERAPPARATUSFOR Proposed Classification REDUCING CROSS CURL IN
SHEETS Int. C1. G03g 21/00 Youti Kuo
James F. Smoak

US. C1.355/309

80

7

FIG. I

XEROX DISCLOSURE JOURNAL - Vol. 20 No. 6 Novernber/December 1995 521

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DECURLER APPARATUS FOR REDUCING CROSS CURL IN SHEETS(Cont'd)

80

     I I I I / 97 97 99 98 99 98 99

FIG. 2

522 XEROX DISCLOSURE JOURNAL - Vol. 20 No. 6 NovernbedDecernber 1995

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

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DECURLER APPARATUS FOR REDUCING CROSS CURL IN SHEETS( Cont'd)

This disclosure relates generally to a printing unit or processor, such as, an office copier, facsimile or non-impact printer, and more particularly concerns an apparatus for decurling sheet material employed therein.

Generally, electrophotographic printing comprises charging a photo- conductive member to a substantially uniform potential so as to sensitize the surface thereof. The charged portion of the photoconductive surface is exposed to a light image of the original document being reproduced. This records an electrostatic latent image on the photoconductive member which corresponds to the informational areas contained within the original document being reproduced. The latent image is developed by bringing a developer material into contact therewith. In this way, a powder image is formed on the photoconductive member which is subsequently transferred to a sheet of support material. The sheet of support material is then heated to permanently affix the powder image thereto.

As the sheet of support material passes through the various processing stations in the electrophotographic printing machine, a curl or bend is frequently induced therein. Occasionally, this curl or bend may be inherent in the sheet of support material due to the method of manufacture thereof. It has been found that this curl is variable from sheet to sheet within the stack of sheets utilized in the printing machine. The curling of the sheet of support material causes problems of handling as the sheet is processed in the printing machine. Sheets delivered in a curled condition have a tendency to have their edges out of registration with the aligning mechanisms employed in the printing machine.

Accordingly, the present invention provides a decurler that includes a belt transport with grooved elastomer transport belt(s) and a ribbed decurler shaft that provides local bending of a copy sheet in the area of the belt grooves. Distributed local bending in the cross direction, as well as, in the wrap in the process direction around the ribbed decurler shaft simultaneously provide cross curl reduction and the reduction of curl in the process direction.

In general, an improvement over prior sheet decurling systems in machines is disclosed which is cost effective and comprises the use of a shaft wit...