US4079227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contact heat fixing apparatus for electrophotographic reproduction machines
Assignee: Xerox Ltd
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Filing: 1976-09-20
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Granted: 1978-03-14
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Expires: 1996-09-20
Abstract
Abstract A contact heat fixing apparatus for electrophotographic reproduction machines wherein a heating roll 1 and a pressure roll 2 contact each other while rotating under pressure and an auxiliary heating roll 12 is provided which is engageable with and disengageable from the heating roll 1 and said auxiliary heating roll 12 is heated by means of a heating device 13 to a predetermined temperature and said auxiliary heating roll 12 is contacted under pressure to the heating roll 1 to heat the same when the temperature on the surface of said heating roll 1 falls below a temperature capable of fixing toner.
Inventors
- 👤 Koichi Takiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:54
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
122 words
Heat and pressure fusing apparatus for fixing toner images to substrate material, said apparatus comprising: fuser roll structure; a pressure roll structure cooperating with the fuser roll structure to form a nip through which said substrate material passes with said toner images contacting said fuser roll structure whereby thermal energy is transferred from the latter to the former; first means for elevating the surface of said fuser roll structure to a first predetermined temperature; second means for raising the temperature of said surface to said predetermined temperature after said surface falls to a second predetermined temperature below said first predetermined temperature due to said thermal energy transfer; said second means for raising the temperature of said surface comprising an auxiliary heating roll.
Claim 2
Dependent Claim
122 words
Heat and pressure fusing apparatus for fixing toner images to substrate material, said apparatus comprising: fuser roll structure; a pressure roll structure cooperating with the fuser roll structure to form a nip through which said substrate material passes with said toner images contacting said fuser roll structure whereby thermal energy is transferred from the latter to the former; first means for elevating the surface of said fuser roll structure to a first predetermined temperature; second means for raising the temperature of said surface to said predetermined temperature after said surface falls to a second predetermined temperature below said first predetermined temperature due to said thermal energy transfer; said second means for raising the temperature of said surface comprising an auxiliary heating roll.
Claim 3
Dependent Claim
33 words
Apparatus according to claim 1 including means for periodically effecting engagement of said heating roll with said fuser roll structure, said periodic engagement corresponding to said surface falling to said second predetermined temperature.
Claim 4
Dependent Claim
23 words
Apparatus according to claim 2 wherein said auxiliary heating roll comprises an internally heated member comprising a copper core surrounding the heating element.
Claim 5
Dependent Claim
82 words
Apparatus according to claim 3 wherein said auxiliary heating roll is adapted to operate at a surface temperature of 200° C and said fuser roll structure is adapted to operate at a surface temperature of 180° C which corresponds to said first predetermined temperature, said auxiliary heating roll operating at such a temperature being adapted to elevate the surface temperature of said fuser roll structure to 180° C from a temperature of about 165° C which corresponds to said second predetermined temperature.
Claim 6
Dependent Claim
29 words
Apparatus according to claim 4 wherein said first means for elevating surface temperature of said fuser roll structure comprises a source of thermal energy which is disposed internally thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |