US4714819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directly heating fixing apparatus having current collecting bearings
Assignee: Proterial Ltd
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Filing: 1986-07-14
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Granted: 1987-12-22
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Expires: 2006-07-14
Abstract
Abstract A directly heating type fixing apparatus for use in an image forming device such as an electronic copying machine, has a heating roll which includes an heat generating electric resistance layer and a toner releasing layer both formed on the surface of a cylindrical body thereof, and a pressure roll which is arranged to contact the heating roll under pressure. Current collecting bearings made of an electrically conductive material are provided on both sides of the heating roll, respectively. These current collecting bearings and the heat generating electric resistance layer of the heating roll are electrically connected with each other.
Inventors
- 👤 Keitaro Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:59
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2053
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A directly heating-type fixing apparatus having a heating roll which includes a heat generating electric resistance layer and a covering layer of a heat resistant toner releasing material, both layers being formed on a surface of a cylindrical body, and a pressure roll which is arranged to contact said heating roll under pressure, the apparatus further comprising a pair of current collecting bearings each made of an electrically conductive material provided at ends of said heating roll, respectively, said current collecting bearings supporting said heating roll against contact by said pressure roll, and said current collecting bearings and the heat generating electric resistance layer of said heating roll being electrically connected with each other.
Claim 2
Dependent Claim
114 words
A directly heating-type fixing apparatus having a heating roll which includes a heat generating electric resistance layer and a covering layer of a heat resistant toner releasing material, both layers being formed on a surface of a cylindrical body, and a pressure roll which is arranged to contact said heating roll under pressure, the apparatus further comprising a pair of current collecting bearings each made of an electrically conductive material provided at ends of said heating roll, respectively, said current collecting bearings supporting said heating roll against contact by said pressure roll, and said current collecting bearings and the heat generating electric resistance layer of said heating roll being electrically connected with each other.
Claim 3
Dependent Claim
33 words
The apparatus as claimed in claim 1, wherein said cylindrical body is made of a metal and an insulating layer is formed between said cylindrical body and said heat generating electric resistance layer.
Claim 4
Dependent Claim
54 words
The apparatus as claimed in claim 2, wherein said heat generating electric resistance layer extends outwardly of both ends of said toner releasing layer in the axial direction, electrode rings are provided on extensions of said heat generating electric resistance layer, and said electrode rings are slidably in contact with said current collecting bearings.
Claim 5
Dependent Claim
17 words
The apparatus as claimed in claim 1, wherein said current collecting bearings are made of a graphite.
Claim 6
Dependent Claim
40 words
The apparatus as claimed in claim 1, wherein said cylindrical heating roll is hollow and a temperature fuse operatively connected to interrupt electric power to said heating roll is provided inside of said hollow roll for the prevention of overheating.
Claim 7
Dependent Claim
49 words
The apparatus as claimed in claim 1, wherein said cylindrical heating roll is hollow, and the apparatus further includes a temperature sensor operatively connected to control the electric power to said heating roll, wherein said temperature sensor is provided in contact with an inner surface of the cylindrical body.
Claim 8
Dependent Claim
17 words
The apparatus as claimed in claim 2, wherein said current collecting bearings are made of a graphite.
Claim 9
Dependent Claim
17 words
The apparatus as claimed in claim 3, wherein said current collecting bearings are made of a graphite.
Claim 10
Dependent Claim
50 words
The apparatus as claimed in claim 1, wherein said cylindrical heating roll is hollow, and the apparatus further includes a temperature sensor operatively connected to control the electric current to said heating roll, wherein said temperature sensor is provided to lie closely adjacent an inner surface of the cylindrical body.
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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) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |