US3581613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flying shear control
Assignee: United Engineering and Foundry Co
•
Filing: 1969-07-22
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Granted: 1971-06-01
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Expires: 1989-07-22
Abstract
Abstract The disclosed flying shear control system operates on the principle of continuously positioning the shear knives as a sine curve function of the measured length of material passed through the shear in relation to the desired sheared length of material. Throughout each shearing cycle, the control system derives a prescribed shear position signal from signals representing the measured material length passed through the shear, desired sheared material length, shear knife travel distance between successive cuts, and amount of shear knife overspeed during shearing. The prescribed shear position signal is compared with an actual shear knife position to derive an error signal which is used to control the shear motor to reduce the error to zero continuously between successive cuts by the shear.
Inventors
- 👤 Ronald Wesley Deems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:45
CPC Classifications
B; B23; B23D; B23D36/00; B23D36/0008; B23D36/0033; B23D36/0041; Y; Y10; Y10T; Y10T83/00; Y10T83/141; Y10T83/159
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
207 words
A control system for continuously positioning the knife of a flying shear comprising: motor means operatively connected to a movable knife of said flying shear to cause the knife to sever material into predetermined lengths, a first signaling means producing a signal representing the position of the shear knife during its movement through the shearing cycle relative to a reference point, a second signaling means producing a signal representing a continuous length measurement of the material passing a given point relative to a point where the knife severs the material, a control circuit receiving the signal from the second signaling means and producing the desired shear knife position control signal, the control circuit including means for deriving an error signal by continuously comparing the actual shear knife position as produced by said first signaling means with the desired shear position as defined by a continuous cyclic mathematical function which includes both the desired cut length and the instantaneous and continuous measurement of the material as produced by said second signaling means, and control means connected to the motor means and continuously receiving said error signal to effect a change in the position of said knife during the shearing cycle to continuously maintain the error signal at zero.
Claim 2
Dependent Claim
207 words
A control system for continuously positioning the knife of a flying shear comprising: motor means operatively connected to a movable knife of said flying shear to cause the knife to sever material into predetermined lengths, a first signaling means producing a signal representing the position of the shear knife during its movement through the shearing cycle relative to a reference point, a second signaling means producing a signal representing a continuous length measurement of the material passing a given point relative to a point where the knife severs the material, a control circuit receiving the signal from the second signaling means and producing the desired shear knife position control signal, the control circuit including means for deriving an error signal by continuously comparing the actual shear knife position as produced by said first signaling means with the desired shear position as defined by a continuous cyclic mathematical function which includes both the desired cut length and the instantaneous and continuous measurement of the material as produced by said second signaling means, and control means connected to the motor means and continuously receiving said error signal to effect a change in the position of said knife during the shearing cycle to continuously maintain the error signal at zero.
Claim 3
Dependent Claim
86 words
In a control system for continuously positioning the knife of a flying shear according to claim 1 wherein the control circuit upon receiving said signals derives the error signal by the following formula: e theta - theta '' where e error signal to motor, theta '' actual shear position, m continuously measured length of material passed through the shear, L desired sheared length of material, O.S. amount of overspeed of the shear knives relative to material sPeed during cut, and LK circumferential shear knife travel distance.
Claim 4
Dependent Claim
42 words
A control system for continuously positioning the knife of a flying shear according to claim 1 wherein said control circuit further includes means for producing said function as a single continuous cyclic trigonometrical function or two or more continuous noncyclic trigonometrical functions.
Claim 5
Dependent Claim
32 words
In a control system for continuously positioning the knife of a flying shear according to claim 3 wherein said control circuit includes means for characterizing said function as a trigonometrical sine function.
Claim 6
Dependent Claim
39 words
A control system for continuously positioning the knife of a flying shear according to claim 1 wherein said control circuit includes means representing the overspeed of the shear knife with respect to the material at the instant of shearing.
References Cited (Backward Citations)
US3071999A
Cited
US3175441A
Cited
US3181403A
Cited
US3176557A
Cited
US3232157A
Cited
US3411388A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |