Patent US3697722A successfully refreshed from Google Patents.
US3697722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating device for copying machines
Assignee: Katsuragawa Electric Co Ltd
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Filing: 1971-06-29
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Granted: 1972-10-10
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Expires: 1991-06-29
Abstract
Abstract In a heating device for a copying machine comprising a conveyor for continuously conveying a copying paper and an electric heater for heating the copying paper a rotatable body is arranged to be rotated by the movement of the copying paper and means responsive to the rotation of the rotatable body for deenergizes the electric heater when the speed of the copying paper decreases to a value less than a predetermined value.
Inventors
- 👤 Masayoshi Furuichi
- 👤 Takaaki Konuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:27
CPC Classifications
G; G03; G03D; G03D15/00; G03D15/02; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
In a heating device for a copying machine of the type comprising conveyor means for continuously conveying a copying paper and an electric heating element for heating said copying paper while it is being conveyed by said conveyor means, the improvement which comprises a rotatable body arranged to be rotated by the movement of said copying paper and means responsive to the rotation of said rotatable body for deenergizing said electric heating element when the speed of said copying paper decreases to a value less than a predetermined value.
Claim 2
Dependent Claim
89 words
In a heating device for a copying machine of the type comprising conveyor means for continuously conveying a copying paper and an electric heating element for heating said copying paper while it is being conveyed by said conveyor means, the improvement which comprises a rotatable body arranged to be rotated by the movement of said copying paper and means responsive to the rotation of said rotatable body for deenergizing said electric heating element when the speed of said copying paper decreases to a value less than a predetermined value.
Claim 3
Dependent Claim
67 words
The heating device according to claim 1 which further includes a perforated disc driven by said rotatable body, a source of light positioned on one side of said disc, a photoelectric transducer disposed on the opposite side of said disc for producing an electric pulse, and means responsive to the number of pulses produced in a predetermined interval for controlling the energization of said electric heating element.
Claim 4
Dependent Claim
31 words
The heating device according to claim 1 which further includes a switch disposed before said rotary body and arranged to be operated by said copying paper for energizing said heating element.
Claim 5
Dependent Claim
49 words
The heating device according to claim 1 which further comprises a suction box having a perforated top side and wherein said conveyor means is disposed to slide along said perforated top side and said rotary body projects upwardly through said top side to be contacted by said copying paper.
References Cited (Backward Citations)
US3444354A
Cited
US3452181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |