US4937631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fusing unit for a copy machine
Assignee: Sindo Ricoh Co Ltd
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Filing: 1989-06-06
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Granted: 1990-06-26
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Expires: 2009-06-06
Abstract
Abstract An improved heating roller type fusing unit for a copy machine is disclosed in which a guide plate and a guide roller are added to the existing fusing unit consisting of a heating roller and a pressing roller. The guide plate performs the function of conveying the paper to the nip portion, while the guide roller performs the function of applying a lateral tension on the paper before the paper enters into the nip portion, with the result that the nip portion has only to carry out the fusing function.
Inventors
- 👤 Jae-Hwan Kim
- 👤 Myoung-Sub Sim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:32
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2017; G03G15/2028
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
94 words
A heating roller type fusing unit for a copy machine in which the fusing of the toner image is carried out by passing the toner-applied paper between a heating roller and a pressing roller, said heating and pressing rollers forming a nip therebetween, comprising: a guide roller for applying a lateral tension to the paper before the paper enters into said nip of said fusing unit, means for pressing said guide roller against said heating roller and being separated from said pressing roller; and a guide plate for guiding the paper to said nip.
Claim 2
Dependent Claim
94 words
A heating roller type fusing unit for a copy machine in which the fusing of the toner image is carried out by passing the toner-applied paper between a heating roller and a pressing roller, said heating and pressing rollers forming a nip therebetween, comprising: a guide roller for applying a lateral tension to the paper before the paper enters into said nip of said fusing unit, means for pressing said guide roller against said heating roller and being separated from said pressing roller; and a guide plate for guiding the paper to said nip.
Claim 3
Dependent Claim
55 words
The heating roller type fusing unit as claimed in claim 1, wherein said guide roller comprises: a support shaft and a pair of guide rolls tapered and symmetrically installed on said shaft, and said pressing means comprises a pair of springs respectively installed at opposite ends of said shaft for applying pressure to said shaft.
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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |