Patent US6775491B2 successfully refreshed from Google Patents.
US6775491B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fixing unit
Assignee: Oki Electric Industry Co Ltd
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Filing: 2003-05-30
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Granted: 2004-08-10
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Expires: 2023-05-30
Abstract
Abstract A fixing unit fixes a developing material deposited on a recording medium by heating and pressing the recording medium. The fixing unit includes two heating members that apply heat to the recording medium and two temperature-sensitive shutoff devices. The two temperature-sensitive shutoff devices are connected in series with a corresponding one of the heating members. Each of the temperature-sensitive shut-off devices includes a first heat-sensitive shut-off element and a second heat-sensitive shut-off element. The first heat-sensitive shut-off element shuts off electric power to the corresponding one of the two heating members when a temperature of a surface of the corresponding one of the two heating members exceeds a certain value. The second heat-sensitive shut-off element shuts off electric power to the corresponding one of the two heating members when a temperature of a surface of the second one of the two heating members exceeds a certain value.
Inventors
- 👤 Naoji Akutsu
- 👤 Akinori Kumonaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:45
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2014; G03G15/2039; G03G15/2042; G03G15/2053
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
145 words
A fixing unit that fixes a developing material deposited on a recording medium by heating and pressing the recording medium, comprising: two heating members that apply heat to the recording medium; and two temperature-sensitive shut-off devices each of which is connected in series with a corresponding one of the two heating members; wherein each of the two temperature-sensitive shut-off devices includes a first heat-sensitive shut-off element and a second heat-sensitive shut-off element, the first heat-sensitive shut-off element shutting off electric power to the corresponding one of the two heating members when a temperature of surface of the corresponding one of the two heating members exceeds a predetermined value, the second heat-sensitive shut-off element shutting off electric power to the corresponding one of the two heating members when a temperature of a surface of the second one of the two heating members exceeds a predetermined value.
Claim 2
Dependent Claim
145 words
A fixing unit that fixes a developing material deposited on a recording medium by heating and pressing the recording medium, comprising: two heating members that apply heat to the recording medium; and two temperature-sensitive shut-off devices each of which is connected in series with a corresponding one of the two heating members; wherein each of the two temperature-sensitive shut-off devices includes a first heat-sensitive shut-off element and a second heat-sensitive shut-off element, the first heat-sensitive shut-off element shutting off electric power to the corresponding one of the two heating members when a temperature of surface of the corresponding one of the two heating members exceeds a predetermined value, the second heat-sensitive shut-off element shutting off electric power to the corresponding one of the two heating members when a temperature of a surface of the second one of the two heating members exceeds a predetermined value.
Claim 3
Dependent Claim
62 words
The fixing unit according to claim 1 , wherein the two heating members and the two temperature-sensitive shut-off devices form two series connections, wherein each of the two series connections is a series connection of one of the two heating members and one of the two temperature-sensitive shut-off devices, the two series connections being connected in parallel with an electric power source.
Claim 4
Dependent Claim
16 words
The fixing unit according to claim 1 , wherein the temperature-sensitive shut-off devices are overtemperature thermostats.
Claim 5
Dependent Claim
16 words
The fixing unit according to claim 1 , wherein the temperature-sensitive shut-off devices are thermal fuses.
Claim 6
Dependent Claim
144 words
A fixing unit that fixes a developing material deposited on a recording medium by heating and pressing the recording medium, comprising: and a first number of heating members that apply heat to the recording medium; a second number of temperature-sensitive shut-off devices in series with each one of the first number of heating members; wherein each of the first number of heating members receives electric power through a series connection, the second number of temperature-sensitive shut-off advices operating in such a way that each of the first number of heating members receives electric power through the series connection of the second number of temperature-sensitive shut-off devices, each of the second number of temperature-sensitive shut-off devices receiving heat from surface of a corresponding one of the first number of heating members to turn off the electric tower in response to a temperature of the surface.
Claim 7
Dependent Claim
144 words
A fixing unit that fixes a developing material deposited on a recording medium by heating and pressing the recording medium, comprising: and a first number of heating members that apply heat to the recording medium; a second number of temperature-sensitive shut-off devices in series with each one of the first number of heating members; wherein each of the first number of heating members receives electric power through a series connection, the second number of temperature-sensitive shut-off advices operating in such a way that each of the first number of heating members receives electric power through the series connection of the second number of temperature-sensitive shut-off devices, each of the second number of temperature-sensitive shut-off devices receiving heat from surface of a corresponding one of the first number of heating members to turn off the electric tower in response to a temperature of the surface.
Claim 8
Dependent Claim
32 words
The fixing unit according to claim 5 , wherein the first number of heating members include two heating members and the second number of temperature-sensitive shut-off devices include two temperature-sensitive shut-off devices.
Claim 9
Dependent Claim
60 words
The fixing unit according to claim 6 , wherein the two heating members and the two temperature-sensitive shut-off devices form two series connections, wherein each of the two series connections is a series connection of one of the two heating members and the two temperature-sensitive shut-off device, the two series connections being connected in parallel with an electric power source.
Claim 10
Dependent Claim
16 words
The fixing unit according to claim 5 , wherein the temperature-sensitive shut-off devices are overtemperature thermostats.
Claim 11
Dependent Claim
16 words
The fixing unit according to claim 5 , wherein the temperature-sensitive shut-off devices are thermal fuses.
Claim 12
Dependent Claim
91 words
A fixing unit that fixes a developing material deposited on a recording medium by heating and pressing the recording medium, comprising: a first number of heating members that apply heat to the recording medium; a second number of temperature-sensitive shut-off devices; and wherein each of the first number of heating members receives electric power through a series circuit, each of the second number of temperature-sensitive shut-off devices responding to a surface temperature of a corresponding one of the first number of heating members so that when the surface temperature exceeds a
Claim 13
Dependent Claim
91 words
A fixing unit that fixes a developing material deposited on a recording medium by heating and pressing the recording medium, comprising: a first number of heating members that apply heat to the recording medium; a second number of temperature-sensitive shut-off devices; and wherein each of the first number of heating members receives electric power through a series circuit, each of the second number of temperature-sensitive shut-off devices responding to a surface temperature of a corresponding one of the first number of heating members so that when the surface temperature exceeds a
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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) | 2007-08-10 | 2008-02-09 | 2008-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2011-08-10 | 2012-02-09 | 2012-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2015-08-10 | 2016-02-09 | 2016-08-10 | $7700.00 | Window Closed / Lapsed |