US4653897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low mass conformable heat and pressure fuser
Assignee: Xerox Corp
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Filing: 1984-12-24
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Granted: 1987-03-31
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Expires: 2004-12-24
Abstract
Abstract Heat and pressure fusing apparatus having a thin-walled tubular fuser roll cooperating with a rigid pressure roll to pass copy substrates therebetween with the toner images on the substrates contacting the fuser roll. The rolls are supported in pressure engagement such that the axes are skewed relative to each other to compensate for roll deflection aggravated by hoop deflection of the thin-walled fuser roll. Thermal degradation of the elastomeric conformable coating is reduced by standing by at a low temperature and quickly warming up to run temperature.
Inventors
- 👤 Paul M. Fromm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:28
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
Heat and pressure fusing apparatus for fixing toner images to copy substrates, said apparatus comprising: a thin-walled, tubular fuser roll having a wall thickness of about approximately in the range of 0.010 to 0.018 inches; a conformable layer adhered to the outer surface of said fuser roll; means supported internally of said fuser roll for elevating the temperature thereof; a rigid pressure roll; means for supporting said fuser roll and said pressure roll in a pressure engagement suitable for deforming said conformable layer to conform to paper roughness, and such that the axes of said rolls are skewed relative to each other.
Claim 2
Dependent Claim
102 words
Heat and pressure fusing apparatus for fixing toner images to copy substrates, said apparatus comprising: a thin-walled, tubular fuser roll having a wall thickness of about approximately in the range of 0.010 to 0.018 inches; a conformable layer adhered to the outer surface of said fuser roll; means supported internally of said fuser roll for elevating the temperature thereof; a rigid pressure roll; means for supporting said fuser roll and said pressure roll in a pressure engagement suitable for deforming said conformable layer to conform to paper roughness, and such that the axes of said rolls are skewed relative to each other.
Claim 3
Dependent Claim
28 words
Apparatus according to claim 1 wherein said axes are angularly skewed to a degree sufficient to compensate for roll deflection aggravated by hoop deflection of said fuser roll.
Claim 4
Dependent Claim
28 words
Apparatus according to claim 1 wherein the load created on said rolls by said supporting means is in the order of 10 to 12 pounds per linear inch.
Claim 5
Dependent Claim
19 words
Apparatus according to claim 3 wherein the length of said fuser roll is in the order of 10-121/2 inches.
Claim 6
Dependent Claim
98 words
Heat and pressure fusing apparatus for fixing toner images to copy substrates, said apparatus comprising: a relatively low mass tubular fuser roll having thin walls and a deformable circular cross section; a conformable layer on the exterior of said fuser roll; means supported internally of said fuser roll for elevating the temperature thereof; a rigid pressure roll; means for fixedly supporting said fuser roll and said pressure roll in pressure engagement suitable for deformation of said conformable outer layer, with said fuser roll lngitudinal axis and said pressure roll longitudinal axis being slightly skewed relative to each other.
Claim 7
Dependent Claim
98 words
Heat and pressure fusing apparatus for fixing toner images to copy substrates, said apparatus comprising: a relatively low mass tubular fuser roll having thin walls and a deformable circular cross section; a conformable layer on the exterior of said fuser roll; means supported internally of said fuser roll for elevating the temperature thereof; a rigid pressure roll; means for fixedly supporting said fuser roll and said pressure roll in pressure engagement suitable for deformation of said conformable outer layer, with said fuser roll lngitudinal axis and said pressure roll longitudinal axis being slightly skewed relative to each other.
Claim 8
Dependent Claim
24 words
The apparatus as defined in claim 5 wherein the angle between said axes is approximately in the range between 1 and 3 angular degrees.
References Cited (Backward Citations)
US3964431A
Cited
US4001544A
Cited
US3942887A
Cited
US4188109A
Cited
US4259920A
Cited
US4212631A
Cited
US4269594A
Cited
US4200389A
Cited
GB2027640A
Cited
US4290691A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-30 | 1990-09-29 | 1991-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-30 | 1994-09-29 | 1995-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-30 | 1998-09-29 | 1999-03-31 | $7700.00 | Window Closed / Lapsed |