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Patent US3178919A successfully refreshed from Google Patents.
US3178919A
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Integral reset control system for a rolling mill screwdown
Assignee: Industrial Nucleonics Corp
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Filing: 1961-05-25
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Granted: 1965-04-20
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Expires: 1981-05-25
Abstract
No abstract record available.
Inventors
- 👤 Donald E Varner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:10
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/58; B21B37/62; B21B13/00; B21B13/14; B21B13/147; B21B31/00; B21B31/16; B21B31/20; B21B31/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN A CONTROL SYSTEM FOR A STRIP ROLLING MILL WHEREIN AN ERROR SIGNAL REPRESENTING THE THICKNESS DEVIATION OF THE STRIP AT THE OUTPUT OF THE MILL IS FED BACK TO CONTROL THE SPACING BETWEEN THE WORK ROLLS AND THE MILL, THE IMPROVEMENT OF MEANS FOR MULTIPLYING SAID ERROR SIGNAL BY THE LINEAR SPEED OF SAID OUTPUT STRIP TO PROVIDE A SIGNAL PROPORTIONAL TO THE PRODUCT OF SAID THICKNESS DEVIATION AND SAID STRIP SPEED, MEANS RECEIVING SAID PRODUCT PROPORTIONAL SIGNAL FOR COMPUTING A TIME INTEGRAL THEREOF AND FOR ADJUSTING SAID WORK ROLL SPACING BY AN AMOUNT PROPORTIONAL TO SAID INTEGRAL, MEANS FOR GENERATING A THICKNESS ERROR RATE SIGNAL PROPORTIONAL TO THE RATE OF CHANGE OF ONLY SAID THICKNESS DEVIATION EXCLUSIVE OF CHANGES IN SAID STRIP SPEED, AND MEANS FOR ADDING SAID RATE OF CHANGE PROPORTIONAL SIGNAL TO SAID PRODUCT PROPORTIONAL SIGNAL RECEIVED BY SAID INTEGRAL COMPUTING AND WORK ROLL SPACING ADJUSTING MEANS TO COMPENSATE FOR PHASE LAG IN THE OPERATION THEREOF.
Claim 2
Dependent Claim
160 words
IN A CONTROL SYSTEM FOR A STRIP ROLLING MILL WHEREIN AN ERROR SIGNAL REPRESENTING THE THICKNESS DEVIATION OF THE STRIP AT THE OUTPUT OF THE MILL IS FED BACK TO CONTROL THE SPACING BETWEEN THE WORK ROLLS AND THE MILL, THE IMPROVEMENT OF MEANS FOR MULTIPLYING SAID ERROR SIGNAL BY THE LINEAR SPEED OF SAID OUTPUT STRIP TO PROVIDE A SIGNAL PROPORTIONAL TO THE PRODUCT OF SAID THICKNESS DEVIATION AND SAID STRIP SPEED, MEANS RECEIVING SAID PRODUCT PROPORTIONAL SIGNAL FOR COMPUTING A TIME INTEGRAL THEREOF AND FOR ADJUSTING SAID WORK ROLL SPACING BY AN AMOUNT PROPORTIONAL TO SAID INTEGRAL, MEANS FOR GENERATING A THICKNESS ERROR RATE SIGNAL PROPORTIONAL TO THE RATE OF CHANGE OF ONLY SAID THICKNESS DEVIATION EXCLUSIVE OF CHANGES IN SAID STRIP SPEED, AND MEANS FOR ADDING SAID RATE OF CHANGE PROPORTIONAL SIGNAL TO SAID PRODUCT PROPORTIONAL SIGNAL RECEIVED BY SAID INTEGRAL COMPUTING AND WORK ROLL SPACING ADJUSTING MEANS TO COMPENSATE FOR PHASE LAG IN THE OPERATION THEREOF.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |