US3686771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Humidity regulating system for printing machines
Assignee: Sächsisches Institut für die Druckindustrie
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Filing: 1970-12-04
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Granted: 1972-08-29
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Expires: 1990-12-04
Abstract
Abstract A system for regulating the amount of humidity, and mainly the thickness of a humidity film, present on printing cylinders, and for thereby influencing acceptance or rejection of printing media. A first subsystem measures and regulates a first characteristic and particularly the temperature that prevails on the cylinder surface or in the layer of air, directly at this surface. A second subsystem measures and regulates a second characteristic and particularly the humidity of a stream of air, supplied to said surface, or the flow rate of this stream, or both. The two sub systems are pneumatically interconnected or electromechanically linked.
Inventors
- 👤 Helmut Schone
- 👤 Horst Henkenhne
- 👤 Lothar Vetter
- 👤 Horst Krause
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:53
CPC Classifications
G; G05; G05D; G05D22/00; G05D22/02; B; B41; B41F; B41F33/00; B41F33/0054; B41F7/00; B41F7/20; B41F7/24; B41F7/37
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
216 words
A system for regulating the thickness of the film of humidity on a printing cylinder surface, particularly in a color offset process and perfector, said system comprising: means for applying a stream of moist air to the cylinder surface under variable conditions as to flow rate or moisture content or both; means for variably cooling the cylinder to precipitate moisture of the air on the cylinder surface; means for varying at least said one of said conditions of the stream of air; a principal subsystem including thermometer means to measure temperatures at the cylinder surface, and a regulator for regulating the cooling means in response to the measured temperatures; and an auxiliary subsystem including means for measuring at least one of said conditions of the stream of air, and a regulator for regulating said condition in response to its measurement; two AND gates, interposed respectively between the regulator of the principal subsystem and the cooling means, and between the regulator of the auxiliary subsystem and the means for varying a condition of the stream of air; a connection between the output of the principal regulator and an input of the other AND gate; and a connection, including an inverter gate, between the output of the auxiliary AND gate and an input of the principal AND gate.
Claim 2
Independent Claim
216 words
A system for regulating the thickness of the film of humidity on a printing cylinder surface, particularly in a color offset process and perfector, said system comprising: means for applying a stream of moist air to the cylinder surface under variable conditions as to flow rate or moisture content or both; means for variably cooling the cylinder to precipitate moisture of the air on the cylinder surface; means for varying at least said one of said conditions of the stream of air; a principal subsystem including thermometer means to measure temperatures at the cylinder surface, and a regulator for regulating the cooling means in response to the measured temperatures; and an auxiliary subsystem including means for measuring at least one of said conditions of the stream of air, and a regulator for regulating said condition in response to its measurement; two AND gates, interposed respectively between the regulator of the principal subsystem and the cooling means, and between the regulator of the auxiliary subsystem and the means for varying a condition of the stream of air; a connection between the output of the principal regulator and an input of the other AND gate; and a connection, including an inverter gate, between the output of the auxiliary AND gate and an input of the principal AND gate.
Claim 3
Dependent Claim
22 words
A system according to claim 1, wherein said means to measure conditions of said stream includes a hygrometer applied to said stream.
Claim 4
Dependent Claim
38 words
A system according to claim 2, wherein said means for responding to measured conditions includes a thermo-electrical transducer adapted to regulate the means for cooling, and a hygro-electrical transducer adapted to regulate the means for applying moist air.
Claim 5
Dependent Claim
41 words
A system according to claim 1, wherein the means for regulating said condition of said stream of air includes a humidifier interposed in said stream, and means for regulating the humidifier in response to the measured condition existing in said stream.
Claim 6
Independent Claim
191 words
A system for regulating humidity on a work surface, such as that of a printing cylinder, comprising means for applying a stream of moist air to the surface; means controlling the moisture content of said stream, means for variably cooling the surface; means to measure the moisture content of said stream of air; means to measure the temperature of said surface, and means for responding to the measured conditions and comprising them to predetermined conditions, wherein said means to measure conditions includes separate measuring means, one on said surface and one in said stream; said means for responding to said conditions including separate measurement-regulation transducers, one having said cooling means as a follower applied to said surface and the other having as a follower said means controlling the moisture content of said stream; the system also including gating means to make the response of one follower dependent on its transducer and the other transducer, and wherein said gating means include an AND gate between each transducer and its follower, each transducer also having an output applied to the other AND gate, and one such output being so applied across an inverter.
Claim 7
Independent Claim
191 words
A system for regulating humidity on a work surface, such as that of a printing cylinder, comprising means for applying a stream of moist air to the surface; means controlling the moisture content of said stream, means for variably cooling the surface; means to measure the moisture content of said stream of air; means to measure the temperature of said surface, and means for responding to the measured conditions and comprising them to predetermined conditions, wherein said means to measure conditions includes separate measuring means, one on said surface and one in said stream; said means for responding to said conditions including separate measurement-regulation transducers, one having said cooling means as a follower applied to said surface and the other having as a follower said means controlling the moisture content of said stream; the system also including gating means to make the response of one follower dependent on its transducer and the other transducer, and wherein said gating means include an AND gate between each transducer and its follower, each transducer also having an output applied to the other AND gate, and one such output being so applied across an inverter.
Claim 8
Dependent Claim
28 words
A system according to claim 5, wherein the inverter is in the output of the AND gate of the means for measuring conditions in said stream of air.
References Cited (Backward Citations)
US2063672A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |