Patent US3780796A successfully refreshed from Google Patents.
US3780796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multicolour printing press comprising a backing cylinder containing heating chambers
Assignee: Windmoeller and Hoelscher KG
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Filing: 1971-11-12
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Granted: 1973-12-25
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Expires: 1991-11-12
Abstract
Abstract In a multi-colour printing press comprising a backing cylinder containing heating chambers traversed by a medium which is heated in a flow circuit, the said circuit including a heater and a thermostat downstream of the heater for controlling the heater, overheating of the backing cylinder arising out of hunting in the control effected by the thermostat is minimised by a temperature regulator which is effective to introduce a controlled amount of cold medium in the flow path between the heater and the thermostat whenever the temperature of the heating medium exceeds a predetermined value.
Inventors
- 👤 H Miram
- 👤 K Schner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:14
CPC Classifications
B; B41; B41F; B41F13/00; B41F13/08; B41F13/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
Control apparatus for maintaining the temperature of a backing cylinder of a multi-colour printing press at a substantially constant value, comprising a circuit for a heating medium, said circuit including a flow path through heating chambers in the backing cylinder, means for heating the medium, a thermostat downstream of the heating means for controlling the heating means, and a temperature regulator interposed between the heating means and the thermostat, said regulator being operatively connected to a supply of cold medium and being effective to introduce a controlled amount of cold medium in the circuit at a location between the heating means and the thermostat when the temperature of the heating medium exceeds a predetermined value.
Claim 2
Dependent Claim
115 words
Control apparatus for maintaining the temperature of a backing cylinder of a multi-colour printing press at a substantially constant value, comprising a circuit for a heating medium, said circuit including a flow path through heating chambers in the backing cylinder, means for heating the medium, a thermostat downstream of the heating means for controlling the heating means, and a temperature regulator interposed between the heating means and the thermostat, said regulator being operatively connected to a supply of cold medium and being effective to introduce a controlled amount of cold medium in the circuit at a location between the heating means and the thermostat when the temperature of the heating medium exceeds a predetermined value.
Claim 3
Dependent Claim
29 words
Control apparatus according to claim 1, wherein said thermostat and said temperature regulator comprise temperature sensers which are disposed in the said circuit closely downstream of the heating means.
Claim 4
Dependent Claim
13 words
Control apparatus according to either preceding claim, wherein the heating medium is water.
Claim 5
Dependent Claim
52 words
Control apparatus according to any preceding claim, wherein the heating means are in the form of an electric resistance heater comprising a first heating element which is permanently energised and set to heat the medium to a mean value and a second heating element which is energised and de-energised by the thermostat.
Claim 6
Dependent Claim
20 words
Control apparatus according to claim 4, wherein the second heating element has a lower power than the first heating element.
References Cited (Backward Citations)
US2788264A
Cited
US3074695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |