US4307591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolling mill looper control system
Assignee: AEG Westinghouse Industrial Automation Corp
•
Filing: 1980-03-31
•
Granted: 1981-12-29
•
Expires: 2000-03-31
Abstract
Abstract In a hot strip rolling mill a velocity damping compensator circuit is added to the current regulating loop of the looper motor drive generating a torque on the looper arm mechanism between roll stands, thereby to prevent disturbances when applying the looper arm and looper roller against the strip being rolled.
Inventors
- 👤 Robert S. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:10
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/48; B21B37/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
170 words
In a rolling mill looper control system for controlling a looper arm supporting a looper roller adapted to engage a strip of material to be rolled from a first roll stand to a second roll stand, including a direct-current looper motor for applying torque to said looper arm; a speed regulator for adjusting the speed of at least one of said first and second roll stands to provide a predetermined extra-length of said strip between said first and second roll stands; and control circuit means associated with said direct current motor and responsive to a signal representative of instantaneous looper arm position for establishing a torque as a function of looper arm position, while applying said looper roller against said strip; the combination of: means responsive to said instantaneous looper arm position representative signal for deriving a correction signal representative of looper arm position rate of change; with said control circuit means being responsive to said correction signal, thereby to compensate for short term variations in said looper arm positioning.
Claim 2
Dependent Claim
170 words
In a rolling mill looper control system for controlling a looper arm supporting a looper roller adapted to engage a strip of material to be rolled from a first roll stand to a second roll stand, including a direct-current looper motor for applying torque to said looper arm; a speed regulator for adjusting the speed of at least one of said first and second roll stands to provide a predetermined extra-length of said strip between said first and second roll stands; and control circuit means associated with said direct current motor and responsive to a signal representative of instantaneous looper arm position for establishing a torque as a function of looper arm position, while applying said looper roller against said strip; the combination of: means responsive to said instantaneous looper arm position representative signal for deriving a correction signal representative of looper arm position rate of change; with said control circuit means being responsive to said correction signal, thereby to compensate for short term variations in said looper arm positioning.
Claim 3
Dependent Claim
56 words
The system of claim 1 with means operative on said control circuit means and responsive to a start-up condition for imparting to said looper arm a quick motion upward of the pass line of said strip between said first and second roll stands, thereby to make contact with said loop roller within a minimum time interval.
References Cited (Backward Citations)
US2192044A
Cited
US2363684A
Cited
US3169422A
Cited
US3332263A
Cited
US3237439A
Cited
US3399556A
Cited
US3848443A
Cited
US4033492A
Cited
SU662177A1
Cited
US4162624A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |