Patent US3845742A successfully refreshed from Google Patents.
US3845742A
Expired / Lapsed
US
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Fuser roll construction
Assignee: Xerox Corp
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Filing: 1973-05-17
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Granted: 1974-11-05
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Expires: 1993-05-17
Abstract
Abstract A fusing system for an electrostatic reproduction apparatus in which copy sheets are passed through pressure rollers applying heat and pressure to fuse a powder image on the copy sheets. One of the rotatable members which is heated to an elevated temperature to apply heat and pressure includes a core member which is covered with a layer of elastomeric material formed with undulations. The undulations are several mils in depth and sufficiently wide to accommodate the width of stripper fingers received in each of the undulations to facilitate release of the copy sheet from the fuser roll surface.
Inventors
- 👤 R Thettu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:44
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
In an electrostatic reproduction machine in which the fusing device for fusinG powder images to copy sheets is accomplished by passing the powder images on the sheets through the nip of compressible rotatable members which apply heat and pressure, an improved fuser roll comprising; a rigid core member; a layer of elastomeric material overlying said core member; said elastomeric layer being formed with at least one undulation in the surface thereof, said undulation being sufficiently wide and deep and conforming to the powder image surface under operating conditions to impart sheet rigidity to facilitate release of the sheet from the roll surface, wherein each undulation has a depth ranging from about 0.0015 inches to about 0.005 inches, wherein each undulation has a width ranging from about 0.050 inches to about 0.500 inches.
Claim 2
Dependent Claim
132 words
In an electrostatic reproduction machine in which the fusing device for fusinG powder images to copy sheets is accomplished by passing the powder images on the sheets through the nip of compressible rotatable members which apply heat and pressure, an improved fuser roll comprising; a rigid core member; a layer of elastomeric material overlying said core member; said elastomeric layer being formed with at least one undulation in the surface thereof, said undulation being sufficiently wide and deep and conforming to the powder image surface under operating conditions to impart sheet rigidity to facilitate release of the sheet from the roll surface, wherein each undulation has a depth ranging from about 0.0015 inches to about 0.005 inches, wherein each undulation has a width ranging from about 0.050 inches to about 0.500 inches.
Claim 3
Dependent Claim
17 words
A roll device according to claim 1 wherein said core member is formed with an undulating pattern.
Claim 4
Dependent Claim
15 words
A roll device according to claim 1 wherein said core member has a uniform diameter.
Claim 5
Dependent Claim
23 words
A roll device according to claim 1 including at least one stripper finger, said finger being positioned in close proximity to said undulation.
Claim 6
Dependent Claim
15 words
A roll device according to claim 1 wherein said undulation is about 0.250 inches wide.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |