Browse Prior Art Database

BIASED PILE FABRICS TO ENABLE COCKLE & WRINKLE FREE SINGLE ROLL FUSERS

IP.com Disclosure Number: IPCOM000025953D
Original Publication Date: 1989-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 87K

Publishing Venue

Xerox Disclosure Journal

Abstract

Figure 1 illustrates a fuser apparatus for electrostatographic printing apparatus which includes a relatively large single soft heated fuser roll 10 and a compliant fabric backing element 12. This fuser relies upon low pressure provided by the fabric-to-fuser roll interface over an extended nip length to assure fusing of a toner image on a copy sheet 14. A problem associated with such a fuser is the formation of wrinkles and cockles in the copy which is believed to be caused by unconstrained movements of the paper during rapid volatilization of residue moisture in the paper substrate. This type of problem is typically solved in a two roll fuser system by using a slightly tapered fuser and/or pressure roll which serves to create a velocity gradient traversing the paper while in the nip which effectively keeps the paper under tension. Figure 2 is a cross section of an oriented or biased pile fabric where the pile mass is uniformly angled in relation to the fabric backing. This fabric may be used as the compliant pressure fabric in Figure 1 with the bias of different sections of fabric having the pile lay directed away from a point in the nips center and outward toward the edges of the fuser. Since the biased fabric offers little resistance to motion of the pile a paper sheet moving parallel to the lay of the pile the paper is allowed minor outward motion while in the nip region. Since the paper is not allowed to retract, it resides in tension by the gripping action of the fabric until exiting the nip.

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XEROX DISCLOSURE JOURNAL

BIASED PILE FABRICS TO ENABLE COCKLE &WRINKLE FREE SINGLE ROLL FUSERS
Joseph A. Swift

Proposed Classification
U.S. C1.355/3FU
Int. C1. G03g 15/00

FIG. 1

FIG. 2

Volume 14 Number 2 March/April 1989 73

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

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BIASED PILE FABRICS TO ENABLE COCKLE & WRINKLE FREE SINGLE ROLL FUSERS (Cont'd)

Figure 1 illustrates a fuser apparatus for electrostatographic printing apparatus which includes a relatively large single soft heated fuser roll 10 and a compliant fabric backing element 12. This fuser relies upon low pressure provided by the fabric-to-fuser roll interface over an extended nip length to assure fusing of a toner image on a copy sheet 14. A problem associated with such a fuser is the formation of wrinkles and cockles in the copy which is believed to be caused by unconstrained movements of the paper during rapid volatilization of residue moisture in the paper substrate. This type of problem is typically solved in a two roll fuser system by using a slightly tapered fuser and/or pressure roll which serves to create a velocity gradient traversing the paper while in the nip which effectively keeps the paper under tension. Figure 2 is a cross section of an oriented or biased pile fabric where the pile mass is uniformly angled in relation to the fabric backing. This fabric may be used as the compliant pressure fabric in Figure 1 with the bias of different sections of fabric having the pile...