US5396318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing device having a curl compensation capability
Assignee: Fujifilm Business Innovation Corp
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Filing: 1993-11-05
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Granted: 1995-03-07
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Expires: 2013-11-05
Abstract
Abstract The present invention relates to a fixing device for use in image recording apparatuses, wherein the toner-adhering face of a sheet (100) onto which toner has been transferred is heated by a heating roller (30) to fix the toner. A pressure roller (20), pressing itself against the heating roller, assists in the heat-fixing process. In order to compensate for the curl resulting from the heat of the heating roller (30), a curl correcting roller (40) heats the back side of the sheet (100) with heat transmitted from the heat conducting part (31) of the heating roller (30) to another heat conducting part (41). This configuration dispenses with a built-in heat source which the curl correcting roller (40) would otherwise need.
Inventors
- 👤 Hidekazu Asada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:11
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2064; G03G2215/00; G03G2215/00362; G03G2215/00535; G03G2215/00662
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
106 words
A fixing device for fixing toner, transferred onto a sheet of paper by an image recording apparatus, comprising: a heating roller for feeding said sheet and heating its surface onto which toner has been transferred; pressure means pressing itself against said heating roller with said sheet intervening in-between; and a curl correcting roller, in contact with a reverse side of the surface to which the toner has been transferred, for heating said reverse side of the surface with heat conducted through contact with part of said heating roller, wherein said heating roller and said curl correcting roller have heat conducting parts in contact with each other.
Claim 2
Dependent Claim
106 words
A fixing device for fixing toner, transferred onto a sheet of paper by an image recording apparatus, comprising: a heating roller for feeding said sheet and heating its surface onto which toner has been transferred; pressure means pressing itself against said heating roller with said sheet intervening in-between; and a curl correcting roller, in contact with a reverse side of the surface to which the toner has been transferred, for heating said reverse side of the surface with heat conducted through contact with part of said heating roller, wherein said heating roller and said curl correcting roller have heat conducting parts in contact with each other.
Claim 3
Dependent Claim
37 words
A fixing device, as claimed in claim 1, wherein the heat conducting parts of said heating roller and of said curl correcting roller include gears which engage with each other to transmit the heat and motive power.
Claim 4
Dependent Claim
25 words
A fixing device, as claimed in claim 1, further including a roller which is in contact with said curl correcting roller to forward said sheet.
Claim 5
Dependent Claim
35 words
A fixing device, as claimed in claim 1, wherein said heating roller has a heat source inside and the surface of said heating roller in contact with said sheet is coated with a polytetrafluoroethylene film.
Claim 6
Dependent Claim
47 words
A fixing device, as claimed in claim 4, wherein said heating roller consists of a highly heat-conductive metallic material, whose surface is coated with said polytetrafluoroethylene, and is heated with heat from said heat source, and said curl correcting roller consists of a highly heat-conductive metallic material.
Claim 7
Dependent Claim
22 words
A fixing device, as claimed in claim 5, wherein the metallic materials of said heating roller and curl correcting roller are aluminum.
Claim 8
Dependent Claim
16 words
A fixing device, as claimed in claim 1, wherein said pressure means is a rubber roller.
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) | 1998-03-06 | 1998-09-05 | 1999-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-06 | 2002-09-05 | 2003-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-06 | 2006-09-05 | 2007-03-07 | $7700.00 | Window Closed / Lapsed |