Patent US5543904A successfully refreshed from Google Patents.
US5543904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixating device
Assignee: Canon Inc
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Filing: 1995-04-25
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Granted: 1996-08-06
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Expires: 2015-04-25
Abstract
Abstract A fixating device has a first rotatable member in contact with an unfixated image borne on a recording medium, a second rotatable member forming a nip together with the second rotatable member, a first heater for heating the first rotatable member, a second heater for heating the second rotatable member, and power supply controlling means for controlling the supply of electric power to the first heater and the second heater. The power supply controlling means is adapted to control the supply of electric power so that when the electric power supplied to the first heater is Wa and the electric power supplied to the second heater is Wb and the ratio when the recording medium is nipped between and conveyed by the first rotatable member and the second rotatable member is Dp=Wa/Wb and the ratio during standby is Ds=Wa/Wb, there may be established Dp>Ds.
Inventors
- 👤 Motoi Kato
- 👤 Akihiko Takeuchi
- 👤 Toshihiko Ochiai
- 👤 Toshiaki Miyashiro
- 👤 Nobuaki Kabeya
- 👤 Takehiko Suzuki
- 👤 Takao Kume
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:09
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039; G03G15/205
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
A fixating device, comprising: a first rotatable member in contact with an unfixated image borne on a recording medium; a second rotatable member forming a nip together with said first rotatable member; a first heater for heating said first rotatable member; a second heater for heating said second rotatable member; and power supply controlling means for controlling supply of electric power to said first heater and said second heater, said power supply controlling means being adapted to control the supply of electric power so that when the electric power supplied to said first heater is Wa and the electric power supplied to said second heater is Wb and the ratio when the recording medium is nipped between and conveyed by said first rotatable member and said second rotatable member is Dp=Wa/Wb and the ratio during standby is Ds=Wa/Wb, there may be established Dp>Ds.
Claim 2
Dependent Claim
143 words
A fixating device, comprising: a first rotatable member in contact with an unfixated image borne on a recording medium; a second rotatable member forming a nip together with said first rotatable member; a first heater for heating said first rotatable member; a second heater for heating said second rotatable member; and power supply controlling means for controlling supply of electric power to said first heater and said second heater, said power supply controlling means being adapted to control the supply of electric power so that when the electric power supplied to said first heater is Wa and the electric power supplied to said second heater is Wb and the ratio when the recording medium is nipped between and conveyed by said first rotatable member and said second rotatable member is Dp=Wa/Wb and the ratio during standby is Ds=Wa/Wb, there may be established Dp>Ds.
Claim 3
Dependent Claim
27 words
A fixating device according to claim 1, wherein said power supply controlling means controls the supply of electric power so that the ratio Ds may be Ds<1.
Claim 4
Dependent Claim
55 words
A fixating device according to claim 1, further having temperature detecting means for detecting the temperature of at least one of said first rotatable member and said second rotatable member, and wherein said power supply controlling means controls the supply of electric power on the basis of the temperature detected by said temperature detecting means.
Claim 5
Dependent Claim
126 words
A fixating device, comprising: a first rotatable member in contact with an unfixated image borne on a recording medium; a second rotatable member forming a nip together with said first rotatable member; a first heater for heating said first rotatable member; a second heater for heating said second rotatable member; and power supply controlling means for controlling supply of electric power to said first heater and said second heater, said power supply controlling means being adapted to control the supply of electric power so that when the electric power supplied to said first heater is Wa and the electric power supplied to said second heater is Wb and the ratio during warm-up is D'p=Wa/Wb and the ratio during standby is Ds=Wa/Wb, there may be established D'p>Ds.
Claim 6
Dependent Claim
126 words
A fixating device, comprising: a first rotatable member in contact with an unfixated image borne on a recording medium; a second rotatable member forming a nip together with said first rotatable member; a first heater for heating said first rotatable member; a second heater for heating said second rotatable member; and power supply controlling means for controlling supply of electric power to said first heater and said second heater, said power supply controlling means being adapted to control the supply of electric power so that when the electric power supplied to said first heater is Wa and the electric power supplied to said second heater is Wb and the ratio during warm-up is D'p=Wa/Wb and the ratio during standby is Ds=Wa/Wb, there may be established D'p>Ds.
Claim 7
Dependent Claim
27 words
A fixating device according to claim 4, wherein said power supply controlling means controls the supply of electric power so that the ratio Ds may be Ds<1.
Claim 8
Dependent Claim
54 words
A fixating device according to claim 4, further comprising temperature detecting means for detecting the temperature of at least one of said first rotatable member and said second rotatable member, wherein said power supply controlling means controls the supply of electric power on the basis of the temperature detected by said temperature detecting means.
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) | 1999-08-06 | 2000-02-05 | 2000-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-06 | 2004-02-05 | 2004-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-06 | 2008-02-05 | 2008-08-06 | $7700.00 | Window Closed / Lapsed |