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Browse Prior Art Database

LOW CONTACT METHOD TO CONFORM HEAVYWEIGHT PAPER TO A CURVED BAFFLE

IP.com Disclosure Number: IPCOM000027255D
Original Publication Date: 1995-Dec-31
Included in the Prior Art Database: 2004-Apr-07
Document File: 2 page(s) / 118K

Publishing Venue

Xerox Disclosure Journal

Abstract

The registration system assembly on most copiers includes a pair of crossed rolls which drive a paper to be registered up against a registration guide consisting of an upper and a lower baffles in order to deskew the paper. The gap between the baffles of the registration guide usually is relatively tight, for example, about lOmm, in order to meet buckling constraints for lightweight paper such as 20# paper. Outside of the registration guide (on the inboard end of the sheet) the paper is typically also constrained by two baffles, an upper baffle 10 and a lower baffle 12 as shown in the FIGS, which provide a gap between them that is approximately 3mm.

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

XEROX DISCLOSURE JOURNAL

LOW CONTACT METHOD TO CONFORM HEAVYWEIGHT PAPER U.S. C1.355/316 TO A CURVED BAFFLE
H. William Gray

Proposed Classification Int. C1. G03g 21/00

I

FIG. I

FIG. 2

FIG. 3

XEROX DISCLOSURE JOURNAL - Vol. 20 No. 6 Novernber/Decernber 1995 531

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LOW CONTACT METHOD TO CONFORM HEAVYWEIGHT PAPER TO A CURVED BAFFLE(Cont'd)

The registration system assembly on most copiers includes a pair of crossed rolls which drive a paper to be registered up against a registration guide consisting of an upper and a lower baffles in order to deskew the paper. The gap between the baffles of the registration guide usually is relatively tight, for example, about lOmm, in order to meet buckling constraints for lightweight paper such as 20# paper. Outside of the registration guide (on the inboard end of the sheet) the paper is typically also constrained by two baffles, an upper baffle 10 and a lower baffle 12 as shown in the FIGS, which provide a gap between them that is approximately 3mm.

It has been found that due to differences in beam strength, heavyweight papers, for example, 65# papers, tend to follow a different path (FIG. 2) through the curved baffle gap, as compared to lightweight papers. In following the different path, the inboard of a heavyweight sheet of paper is caused to flatten out and take a shortcut to the next hard nip (see FIG. 2). However, the end of the heavyweight sheet of paper that is constrained in the tight gap of the registration guide (outboard end of the sheet) cannot also flatten out. The difference in path lengths taken by the inboard and outboard ends of such a sheet typically has a skewing influence on the sheets lea...