US3758738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature measuring apparatus for heating roller
Assignee: Teijin Ltd
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Filing: 1972-07-06
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Granted: 1973-09-11
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Expires: 1992-07-06
Abstract
Abstract A quartz crystal resonator is embedded in a circumferential wall portion of a heating roller. The heating roller is provided with a rotary electrode, while a stationary electrode is mounted to a stationary portion of the apparatus to form a rotary air capacitor in cooperation with the rotary electrode. The quartz crystal resonator has two terminals, one of which is grounded and the other of which is connected to an oscillation circuit through the air capacitor variation of impedance of the detector to the outside of the heating roller without any mechanical contact with the latter.
Inventors
- 👤 S Otani
- 👤 F Honda
- 👤 K Mitani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:08
CPC Classifications
H; H05; H05B; H05B6/00; H05B6/02; H05B6/10; H05B6/14; H05B6/145; G; G05; G05D; G05D23/00; G05D23/19; G05D23/20; G05D23/2033; G05D23/2036
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
220 words
In a rotary heating roller apparatus comprising a cup-like rotary body, a driving shaft removably connected at an opened portion of said rotary body and a stationary heating means disposed with an air gap between the inner circumferential surface of said rotary body and the outer circumferential surface of said heating means, an improved temperature measuring apparatus comprising a temperature detector embedded in a circumferential wall portion of said rotary body, and an electrostatic coupling means which electrically connects said temperature detector to an external circuit without mechanical contact, said electrostatic coupling means comprising a rotary air capacitor comprising an annular disc-like rotary electrode attached to an annular open end surface of said rotary body with an electrical insulating material therebetween, and an annular disk-like stationary electrode attached to a stationary portion of said roller apparatus with an electrical insulating material therebetween, said stationary electrode being positioned opposite said rotary electrode; said temperature detector being a quartz crystal resonator having two terminals, one of said terminals being connected with said rotary body which is grounded through said driving shaft, the other terminal thereof being connected with said rotary electrode; and said external circuit having an oscillation circuit which includes said quartz crystal resonator, whereby the temperature of said rotary body can be detectd as the frequency of said oscillation circuit.
Claim 2
Dependent Claim
220 words
In a rotary heating roller apparatus comprising a cup-like rotary body, a driving shaft removably connected at an opened portion of said rotary body and a stationary heating means disposed with an air gap between the inner circumferential surface of said rotary body and the outer circumferential surface of said heating means, an improved temperature measuring apparatus comprising a temperature detector embedded in a circumferential wall portion of said rotary body, and an electrostatic coupling means which electrically connects said temperature detector to an external circuit without mechanical contact, said electrostatic coupling means comprising a rotary air capacitor comprising an annular disc-like rotary electrode attached to an annular open end surface of said rotary body with an electrical insulating material therebetween, and an annular disk-like stationary electrode attached to a stationary portion of said roller apparatus with an electrical insulating material therebetween, said stationary electrode being positioned opposite said rotary electrode; said temperature detector being a quartz crystal resonator having two terminals, one of said terminals being connected with said rotary body which is grounded through said driving shaft, the other terminal thereof being connected with said rotary electrode; and said external circuit having an oscillation circuit which includes said quartz crystal resonator, whereby the temperature of said rotary body can be detectd as the frequency of said oscillation circuit.
Claim 3
Dependent Claim
218 words
In a rotary heating roller apparatus comprising a cup-like rotary body, a driving shaft removably connected at an opened portion of said rotary body and a stationary heating means disposed with an air gap between the inner circumferential surface of said rotary body and the outer circumferential surface of said heating means, an improved temperature measuring apparatus comprising a temperature detector embedded in a circumferential wall portion of said rotary body, and an electrostatic coupling means which electrically connects said temperature detector to an external circuit without mechanical contact, said electrostatic coupling means comprising a rotary air capacitor comprising a cylindrical rotary electrode attached to a circumferential wall portion of said rotary body with an electrical insulating material therebetween, and a cylindrical stationary electrode attached to a stationary portion of said roller apparatus with an electrical insulating material therebetween, said stationary electrode being positioned opposite to said rotary electrode; said temperature detector being a quartz crystal resonator having two terminals, one of said terminals being connected with said rotary body which is grounded through said driving shaft, the other terminal thereof being connected with said rotary electrode; and said external circuit having an oscillation circuit which includes said quartz crystal resonator, whereby the temperature of said rotary body can be detected as the frequency of said oscillation circuit.
Claim 4
Dependent Claim
218 words
In a rotary heating roller apparatus comprising a cup-like rotary body, a driving shaft removably connected at an opened portion of said rotary body and a stationary heating means disposed with an air gap between the inner circumferential surface of said rotary body and the outer circumferential surface of said heating means, an improved temperature measuring apparatus comprising a temperature detector embedded in a circumferential wall portion of said rotary body, and an electrostatic coupling means which electrically connects said temperature detector to an external circuit without mechanical contact, said electrostatic coupling means comprising a rotary air capacitor comprising a cylindrical rotary electrode attached to a circumferential wall portion of said rotary body with an electrical insulating material therebetween, and a cylindrical stationary electrode attached to a stationary portion of said roller apparatus with an electrical insulating material therebetween, said stationary electrode being positioned opposite to said rotary electrode; said temperature detector being a quartz crystal resonator having two terminals, one of said terminals being connected with said rotary body which is grounded through said driving shaft, the other terminal thereof being connected with said rotary electrode; and said external circuit having an oscillation circuit which includes said quartz crystal resonator, whereby the temperature of said rotary body can be detected as the frequency of said oscillation circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |