US5532806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image fixing apparatus having means for preventing temperature unevenness
Assignee: Canon Inc
•
Filing: 1994-04-28
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Granted: 1996-07-02
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Expires: 2014-04-28
Abstract
Abstract An image fixing apparatus includes a heating member; a film in slidable contact with the heating member; a pressing roller cooperable with the heating member to form a nip with the film therebetween; wherein the pressing roller comprises a core metal of aluminum; and a metal member for transferring heat from the heating member.
Inventors
- 👤 Takeshi Sugita
- 👤 Nobukazu Adachi
- 👤 Akira Kuroda
- 👤 Manabu Takano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:48
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064; G03G15/206; G03G2215/00; G03G2215/20; G03G2215/2003; G03G2215/2016; G03G2215/2035
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
84 words
An image fixing apparatus, comprising: a heating member; a film in slidable contact with said heating member; a pressing roller cooperable with said heating member to form a nip with said film therebetween; wherein said pressing roller comprises a core metal of aluminum and has a rubber layer outside said core metal and a ratio of cross-sectional area of said core metal to that of said pressing roller is not less than 25%; and a metal member for transferring heat from said heating member.
Claim 2
Dependent Claim
84 words
An image fixing apparatus, comprising: a heating member; a film in slidable contact with said heating member; a pressing roller cooperable with said heating member to form a nip with said film therebetween; wherein said pressing roller comprises a core metal of aluminum and has a rubber layer outside said core metal and a ratio of cross-sectional area of said core metal to that of said pressing roller is not less than 25%; and a metal member for transferring heat from said heating member.
Claim 3
Dependent Claim
36 words
An apparatus according to claim 1, wherein a recording material is passed through and fed by said nip to fix an unfixed image on said recording material by heat from said heating member through said film.
Claim 4
Dependent Claim
21 words
An apparatus according to claim 1, wherein said film is an endless film, and said metal member is inside said film.
Claim 5
Dependent Claim
13 words
An apparatus according to claim 3, wherein said metal member supports said film.
Claim 6
Dependent Claim
19 words
An apparatus according to claim 1, wherein said metal member extends in a direction of width of said film.
Claim 7
Dependent Claim
25 words
An apparatus according to claim 1, further comprising supporting member for supporting said heating member, and said metal member is mounted to said supporting member.
Claim 8
Dependent Claim
74 words
An image fixing apparatus comprising: a heating member; an endless film loop in slidable contact with said heating member; a pressing roller cooperable with said heating member to form a nip with said film therebetween; a metal member extending in a direction substantially perpendicular to a movement direction of said film and adjacent to and outside of said film loop, wherein the smallest distance between said film and said metal member is 1-6 mm.
Claim 9
Dependent Claim
74 words
An image fixing apparatus comprising: a heating member; an endless film loop in slidable contact with said heating member; a pressing roller cooperable with said heating member to form a nip with said film therebetween; a metal member extending in a direction substantially perpendicular to a movement direction of said film and adjacent to and outside of said film loop, wherein the smallest distance between said film and said metal member is 1-6 mm.
Claim 10
Dependent Claim
21 words
An apparatus according to claim 7, wherein said metal member extends in a direction of an axis of said pressing roller.
Claim 11
Dependent Claim
18 words
An apparatus according to claim 7, wherein said metal member is a frame of an image fixing apparatus.
Claim 12
Dependent Claim
19 words
An apparatus according to claim 7, wherein said metal member is mounted to a frame of said fixing apparatus.
Claim 13
Dependent Claim
36 words
An apparatus according to claim 7, wherein a recording material is passed through and fed by said nip to fix an unfixed image on said recording material by heat from said heating member through said film.
Claim 14
Dependent Claim
73 words
An image fixing apparatus, comprising: a heating member; a film in slidable contact with said heating member; and a pressing roller cooperable with said heating member to form a nip with said film therebetween, wherein said pressing roller comprises a core metal of aluminum and a rubber layer outside said core metal, and a ratio of cross-sectional area of said core metal to that of said pressing roller is not less than 25%.
Claim 15
Dependent Claim
73 words
An image fixing apparatus, comprising: a heating member; a film in slidable contact with said heating member; and a pressing roller cooperable with said heating member to form a nip with said film therebetween, wherein said pressing roller comprises a core metal of aluminum and a rubber layer outside said core metal, and a ratio of cross-sectional area of said core metal to that of said pressing roller is not less than 25%.
Claim 16
Dependent Claim
36 words
An apparatus according to claim 12, wherein a recording material is passed through and fed by said nip to fix an unfixed image on said recording material by heat from said heating member through said film.
Claim 17
Dependent Claim
32 words
An apparatus according to claim 12, further comprising a metal member for transferring heat from said heating member, wherein said metal member is provided each of inside and outside of said film.
Claim 18
Dependent Claim
25 words
An apparatus according to claim 12, wherein the cross-sectional area of said core metal relative to that of said pressing-roller is not more than 60%.
Claim 19
Dependent Claim
25 words
An apparatus according to claim 1, wherein the cross-sectional area of said core metal relative to that of said pressing-roller is not more than 60%.
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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) | 1999-07-02 | 2000-01-01 | 2000-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-02 | 2004-01-01 | 2004-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-02 | 2008-01-01 | 2008-07-02 | $7700.00 | Window Closed / Lapsed |