Patent US5319430A successfully refreshed from Google Patents.
US5319430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuser mechanism having crowned rolls
Assignee: Xerox Corp
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Filing: 1993-01-04
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Granted: 1994-06-07
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Expires: 2013-01-04
Abstract
Abstract A roll fuser assembly including a fuser roll and a pressure roll. The rolls are crowned and are supported in pressure engagement with each other to form a fusing nip. The pressure engagement of the rolls eliminate nonuniform nip loading in wide fusers as well as providing uniform velocity through the fuser roll/pressure roll nip. It is preferred that the crowned profile of one of the rolls be substantially to the center of the roll and that the other be offset therefrom. It is further preferred that the diameters of each of the rolls be substantially the same at each end.
Inventors
- 👤 Frederick C. DeBolt
- 👤 Kenneth R. Rasch
- 👤 Russell A. Parisi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/206; G03G2215/00; G03G2215/20; G03G2215/2003; G03G2215/2058; G03G2215/2064
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
198 words
Apparatus for fusing toner images to substrates, comprising: an elongated heated fuser roll having a crowned surface and a non-crowned surface; an elongated pressure roll having a crowned surface and a non-crowned surface, said pressure roll being supported for pressure engagement with said fuser roll to form a nip therebetween adapted to receive the substrates, said pressure roll comprises a surface having a maximum diameter in the central region thereof, and said fuser roll comprises a surface having a maximum diameter offset from the maximum diameter of said pressure roll; means for applying substantially uniform pressure and velocity on the substrates in the nip, said applying means comprises loading means for deflecting said pressure roll into pressure engagement with said fuser roll to form the nip, wherein the sum of the distance between the non-crowned surface and crowned surface of said fuser roll and said pressure roll is approximately equal to the sum of the deflection of said fuser roll and said pressure roll so that said fuser roll and said pressure roll form substantially non-crowned surfaces when in pressure engagement with one another and; means for supporting said pressure roll rotatably in contact with said fuser roll.
Claim 2
Dependent Claim
198 words
Apparatus for fusing toner images to substrates, comprising: an elongated heated fuser roll having a crowned surface and a non-crowned surface; an elongated pressure roll having a crowned surface and a non-crowned surface, said pressure roll being supported for pressure engagement with said fuser roll to form a nip therebetween adapted to receive the substrates, said pressure roll comprises a surface having a maximum diameter in the central region thereof, and said fuser roll comprises a surface having a maximum diameter offset from the maximum diameter of said pressure roll; means for applying substantially uniform pressure and velocity on the substrates in the nip, said applying means comprises loading means for deflecting said pressure roll into pressure engagement with said fuser roll to form the nip, wherein the sum of the distance between the non-crowned surface and crowned surface of said fuser roll and said pressure roll is approximately equal to the sum of the deflection of said fuser roll and said pressure roll so that said fuser roll and said pressure roll form substantially non-crowned surfaces when in pressure engagement with one another and; means for supporting said pressure roll rotatably in contact with said fuser roll.
Claim 3
Dependent Claim
200 words
Apparatus for fusing toner images to substrates, comprising: an elongated heated fuser roll having a crowned surface and a non-crowned surface, said fuser roll comprises a surface having a maximum diameter positioned approximately one third of the length from one end thereof; an elongated pressure roll having a crowned surface and a non-crowned surface, said pressure roll being supported for pressure engagement with said fuser roll to form a nip therebetween adapted to receive the substrates, said pressure roll comprises a surface having a maximum diameter in the central region thereof, and; means for applying substantially uniform pressure and velocity on the substrates in the nip, said applying means comprises loading means for deflecting said pressure roll into pressure engagement with said fuser roll to form the nip, wherein the sum of the distance between the non-crowned surface and crowned surface of said fuser roll and said pressure roll is approximately equal to the sum of the deflection of said fuser roll and said pressure roll so that said fuser roll and said pressure roll form substantially non-crowned surfaces when in pressure engagement with one another and; means for supporting said pressure roll rotatably in contact with said fuser roll.
Claim 4
Dependent Claim
200 words
Apparatus for fusing toner images to substrates, comprising: an elongated heated fuser roll having a crowned surface and a non-crowned surface, said fuser roll comprises a surface having a maximum diameter positioned approximately one third of the length from one end thereof; an elongated pressure roll having a crowned surface and a non-crowned surface, said pressure roll being supported for pressure engagement with said fuser roll to form a nip therebetween adapted to receive the substrates, said pressure roll comprises a surface having a maximum diameter in the central region thereof, and; means for applying substantially uniform pressure and velocity on the substrates in the nip, said applying means comprises loading means for deflecting said pressure roll into pressure engagement with said fuser roll to form the nip, wherein the sum of the distance between the non-crowned surface and crowned surface of said fuser roll and said pressure roll is approximately equal to the sum of the deflection of said fuser roll and said pressure roll so that said fuser roll and said pressure roll form substantially non-crowned surfaces when in pressure engagement with one another and; means for supporting said pressure roll rotatably in contact with said fuser roll.
Claim 5
Independent Claim
199 words
A method for fusing toner images to substrates, comprising the steps of: providing an elongated heated fuser roll having a crowned surface and a non-crowned surface; supporting an elongated pressure roll having a crowned surface and a non-crowned surface in pressure engagement with the heated fuser roll to form a nip therebetween adapted to receive the substrates; applying uniform pressure in the nip and effecting velocity on the substrates in the nip, said applying step includes deflecting the pressure roll and the fuser roll in the nip; fabricating the crowned surface of the pressure roll and the crowned surface of the fuser roll so that the sum of the distance between the non-crowned surface and crowned surface corresponds to the deflection of the fuser roll and the pressure roll induced by said deflection step causing the fuser roll and pressure roll to form a substantially non-crowned surface when in pressure engagement with one another; transporting the substrate through the nip; heating the fuser roll so as to fix toner on the transported substrates thereto; and offsetting a maximum diameter of the fuser roll from a maximum diameter of the pressure roll so as to apply a substantially uniform pressure.
Claim 6
Independent Claim
199 words
A method for fusing toner images to substrates, comprising the steps of: providing an elongated heated fuser roll having a crowned surface and a non-crowned surface; supporting an elongated pressure roll having a crowned surface and a non-crowned surface in pressure engagement with the heated fuser roll to form a nip therebetween adapted to receive the substrates; applying uniform pressure in the nip and effecting velocity on the substrates in the nip, said applying step includes deflecting the pressure roll and the fuser roll in the nip; fabricating the crowned surface of the pressure roll and the crowned surface of the fuser roll so that the sum of the distance between the non-crowned surface and crowned surface corresponds to the deflection of the fuser roll and the pressure roll induced by said deflection step causing the fuser roll and pressure roll to form a substantially non-crowned surface when in pressure engagement with one another; transporting the substrate through the nip; heating the fuser roll so as to fix toner on the transported substrates thereto; and offsetting a maximum diameter of the fuser roll from a maximum diameter of the pressure roll so as to apply a substantially uniform pressure.
References Cited (Backward Citations)
US2732591A
Cited
US1875257A
Cited
US2191144A
Cited
GB802179A
Cited
US3437032A
Cited
US3884623A
Cited
US3941558A
Cited
EP0043869A2
Cited
JPS57184173A
Cited
US4393804A
Cited
US4557588A
Cited
US4594068A
Cited
JPS60227905A
Cited
JPS60251881A
Cited
US4955221A
Cited
US4812873A
Cited
US5153660A
Cited
US4939552A
Cited
US5045890A
Cited
US5049944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-06-06 | 1997-12-06 | 1998-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-06-06 | 2001-12-06 | 2002-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-06-06 | 2005-12-06 | 2006-06-07 | $7700.00 | Window Closed / Lapsed |