Patent US4812873A successfully refreshed from Google Patents.
US4812873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat fixing unit in an electrophotographic copying apparatus
Assignee: Minolta Co Ltd
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Filing: 1987-09-04
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Granted: 1989-03-14
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Expires: 2007-09-04
Abstract
Abstract A heat fixing unit in an electrophotographic copying apparatus is disclosed. The heat fixing unit comprises a heat fixing roller with a heater, a pressure roller with a plurality of fibers, and driven ring components disposed on the ends of the pressure roller for adjusting the contact amount between the heat fixing roller and the pressure roller. The heat fixing unit offers a less warming up time and a better paper delivery performance, and requires less material cost. The heat fixing unit in an electrophotographic copying apparatus may employ a fixed type or a rotary type curing unit for raising the plurality of fibers.
Inventors
- 👤 Sanji Inagaki
- 👤 Hiroshi Fukao
- 👤 Tetsuya Yamada
- 👤 Etsuaki Urano
- 👤 Yoshihiro Hattori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/206
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A heat fixing device used in an electrophotographic recording apparatus comprising: a rotatable heat roller having heating means: a rotatable pressure roller having a core and a plurality of fibers disposed on the periphery surface of said core; and rings provided on the both ends of said pressure roller so as to contact with said heat roller and comprising a resilient material for preventing the slip with respect to said heat roller.
Claim 2
Dependent Claim
72 words
A heat fixing device used in an electrophotographic recording apparatus comprising: a rotatable heat roller having heating means: a rotatable pressure roller having a core and a plurality of fibers disposed on the periphery surface of said core; and rings provided on the both ends of said pressure roller so as to contact with said heat roller and comprising a resilient material for preventing the slip with respect to said heat roller.
Claim 3
Dependent Claim
25 words
A heat fixing device according to claim 1, wherein the outer diameter of said rings is identical with the outer diameter of said pressure roller.
Claim 4
Dependent Claim
21 words
A heat fixing device according to claim 1, wherein said pressure roller is driven by said heat roller through said rings.
Claim 5
Dependent Claim
26 words
A heat fixing device according to claim 1, wherein said plurality of fibers are formed of a metal, an aromatic polyamide resin or a fluoro resin.
Claim 6
Dependent Claim
26 words
A heat fixing device according to claim 1, wherein said plurality of fibers are formed of a metal coated with an agent offering a good separability.
Claim 7
Dependent Claim
19 words
A heat fixing device according to claim 1, wherein said plurality of fibers are formed of a conductive material.
Claim 8
Dependent Claim
79 words
A heat fixing device used in an electrophotographic recording apparatus comprising: a rotatable heat roller having heating means: a rotatable pressure roller disposed in contact with said heat roller and having a core and a plurality of fibers provided on the periphery surface of said core; means for adjusting the contact width between said heat roller and said pressure roller; and a curing means contacting with the periphery surface of said pressure roller for raising said plurality of fibers.
Claim 9
Dependent Claim
79 words
A heat fixing device used in an electrophotographic recording apparatus comprising: a rotatable heat roller having heating means: a rotatable pressure roller disposed in contact with said heat roller and having a core and a plurality of fibers provided on the periphery surface of said core; means for adjusting the contact width between said heat roller and said pressure roller; and a curing means contacting with the periphery surface of said pressure roller for raising said plurality of fibers.
Claim 10
Dependent Claim
24 words
A heat fixing device according to claim 7, wherein said curing means is a plate shape component disposed in parallel to said pressure roller.
Claim 11
Dependent Claim
40 words
A heat fixing device according to claim 7, wherein said curing means is a curing roller rotating at a faster speed than the speed of said pressure roller in the direction opposite to the rotating direction of said pressure roller.
Claim 12
Dependent Claim
17 words
A heat fixing device according to claim 9, wherein said curing means has a plurality of fibers.
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) | 1992-03-13 | 1992-09-12 | 1993-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-13 | 1996-09-12 | 1997-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-13 | 2000-09-12 | 2001-03-14 | $7700.00 | Window Closed / Lapsed |