US4987457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing method for a wet process copier
Assignee: Ricoh Co Ltd
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Filing: 1990-01-03
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Granted: 1991-01-22
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Expires: 2010-01-03
Abstract
Abstract A fixing method for a wet process copier which develops an electrostatic latent image by using a heat-bridging type toner, transfers the resulting toner image to a paper sheet, and fixes the toner image transferred on the paper sheet by transporting the paper sheet through a nipping section defined by a heating roller and a pressing roller such that the side of the paper sheet carrying the toner image directly contacts the heating roller. At least a surface portion of the heating roller is made of either one of monomeric, additive-free RTV (Room Temperature Vulcanized) and LTV (Low Temperature Vulcanized) silicone rubbers. The heating roller has average surface roughness of less than 3 microns.
Inventors
- 👤 Manabu Mochizuki
- 👤 Tsuneo Kurotori
- 👤 Ichiro Tsuruoka
- 👤 Katsuhiro Echigo
- 👤 Hiroaki Takenouchi
- 👤 Setsuo Soga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:43
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/20; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053; G03G15/2057
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
132 words
In a fixing method for a wet process copier which develops an electrostatic latent image by using a heat-bridging type toner to produce a toner image, transfers said toner image to a paper sheet, and fixes said toner image transferred to said paper sheet by transporting said paper sheet through a nipping section defined by a heating roller and a pressing roller such that one side of said paper sheet carrying said toner image directly contacts said heating roller, the improvement wherein fixing energy Q (cal/cm 2 ) for fixing said toner image lies in a predetermined range expressed as: ##EQU3## where K is a constant, T is a temperature T (°C.) of said heating roller, l is a width (mm) of said nipping width, and V is a linar velocity (mm/sec).
Claim 2
Dependent Claim
132 words
In a fixing method for a wet process copier which develops an electrostatic latent image by using a heat-bridging type toner to produce a toner image, transfers said toner image to a paper sheet, and fixes said toner image transferred to said paper sheet by transporting said paper sheet through a nipping section defined by a heating roller and a pressing roller such that one side of said paper sheet carrying said toner image directly contacts said heating roller, the improvement wherein fixing energy Q (cal/cm 2 ) for fixing said toner image lies in a predetermined range expressed as: ##EQU3## where K is a constant, T is a temperature T (°C.) of said heating roller, l is a width (mm) of said nipping width, and V is a linar velocity (mm/sec).
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1, wherein said predetermined range of the fixing energy Q is 0.1365 cal/cm 2 to 0.1950 cal/cm 2 .
Claim 4
Dependent Claim
25 words
A method as claimed in claim 2, wherein said predetermined range of the fixing energy Q is 0.1469 cal/cm 2 to 0.1885 cal/cm 2 .
Claim 5
Dependent Claim
34 words
A method as claimed in claim 1, wherein at least a surface portion of said heating roller comprises either one of monomeric, additive-free RTV (Room Temperature Vulcanized) and LTV (Low Temperature Vulcanized) silicone rubbers.
Claim 6
Dependent Claim
22 words
A method as claimed in claim 4, wherein said heating roller has a surface having average roughness of less than 3 microns.
References Cited (Backward Citations)
US4842944A
Cited
US4910559A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |