US4042804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roll fuser apparatus
Assignee: Xerox Corp
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Filing: 1975-09-24
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Granted: 1977-08-16
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Expires: 1995-09-24
Abstract
Abstract An improved pressure and heat fusing apparatus for a copier or duplicator apparatus capable of either simplex or duplex operation including a first roll which is heated to a temperature sufficient to fuse toner images onto support material and a second elastomeric roll arranged axially parallel with the first roll to define a nip through which support material bearing toner images is passed. The second roll is constructed such that its ends move the support material faster at the ends of the support material than at the center thereof.
Inventors
- 👤 Rabin Moser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:13
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/206
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
146 words
Fuser aparatus for fixing toner images to substrate material, said aparatus comprising: a fuser roll member; a backup roll member; means for effecting engagement of said roll members to apply a force between said roll members to thereby form a nip therebetween through which said substrate material passes with said toner images contacting said fuser roll, said means also effecting disengagement to remove said force; one of said roll members comprising a rigid thermally stable core and an outer layer which has a substantially uniform circumference along its longitudinal axis when said force is not applied and when said force is applied has a non-uniform circumference along its longitudinal axis whereby portions thereof adjacent its ends have a longer surface length than the center portion thereof whereby the edges of said substrate material are moved through said nip at a faster speed than the center thereof.
Claim 2
Dependent Claim
146 words
Fuser aparatus for fixing toner images to substrate material, said aparatus comprising: a fuser roll member; a backup roll member; means for effecting engagement of said roll members to apply a force between said roll members to thereby form a nip therebetween through which said substrate material passes with said toner images contacting said fuser roll, said means also effecting disengagement to remove said force; one of said roll members comprising a rigid thermally stable core and an outer layer which has a substantially uniform circumference along its longitudinal axis when said force is not applied and when said force is applied has a non-uniform circumference along its longitudinal axis whereby portions thereof adjacent its ends have a longer surface length than the center portion thereof whereby the edges of said substrate material are moved through said nip at a faster speed than the center thereof.
Claim 3
Dependent Claim
31 words
Apparatus according to claim 1 wherein the thickness of said outer layer is less adjacent the ends of said one of said roll members than it is at the center thereof.
Claim 4
Dependent Claim
36 words
Apparatus according to claim 1 wherein said layer has a substantially uniform thickness and the durometer thereof is greater adjacent the ends of said one of said roll members than it is at the center thereof.
Claim 5
Dependent Claim
35 words
Apparatus according to claim 2 wherein the thickness of said layer adjacent the ends of one of said roll members is about 0.2 inch and the thickness thereof at the center is about 0.22 inch.
Claim 6
Dependent Claim
13 words
Apparatus according to claim 4 wherein said layer is fabricated from silicone rubber.
Claim 7
Dependent Claim
29 words
Apparatus according to claim 4 wherein the inner surface of said layer is gradually tapered between its ends and its center and said core has a complementary outer surface.
Claim 8
Dependent Claim
12 words
Apparatus according to claim 4 wherein said layer has a step configuration.
Claim 9
Dependent Claim
13 words
Apparatus according to claim 3 wherein said layer is fabricated from silicone rubber.
Claim 10
Dependent Claim
17 words
Apparatus according to claim 5 wherein said one of said roll members comprises said backup roll member.
Claim 11
Dependent Claim
17 words
Apparatus according to claim 8 wherein said one of said roll members comprises a backup roll member.
Claim 12
Dependent Claim
16 words
Apparatus according to claim 1 including means for elevating the temperature of said fuser roll member.
References Cited (Backward Citations)
US3861863A
Cited
US3912901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |