US3680753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant tension strand feeding system
Assignee: GOLDSWORTHY ENG Inc
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Filing: 1970-09-21
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Granted: 1972-08-01
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Expires: 1990-09-21
Abstract
Abstract A system for feeding a roving strand to a demand point where the system employs a driven capstan roller for receiving the strand from a strand supply. The strand is also passed around a dancer roller which is mounted on a pivotal arm, and then over a resin applicator to the demand point. The pivotal arm is mounted at a pivot and operatively actuates a rotary transducer which, in turn, controls the speed of the motor operating the capstan. Accordingly, as the demand for the strand increases, the pivotal arm is biased upwardly which, in turn, causes the rotary transducer to increase the speed of the motor operating the capstan. Constant tension is maintained on the pivotal arm by means of a cord which is connected to the arm and to the piston of a pneumatic cylinder. Air biases the piston in one direction causing the arm to be urged downwardly. Thus, by changing the air pressure against the piston, it is possible to change the tension maintained on the pivotal arm.
Inventors
- 👤 David E Shaw-Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:50
CPC Classifications
B; B65; B65H; B65H59/00; B65H59/38; B65H59/384; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
211 words
An apparatus for supplying a strand of material with relatively constant tension maintained thereon pursuant to demand for said strand, said apparatus comprising means for supplying said strand, motive means for moving said strand from said source to a point of demand, a pivotal member operatively associated with said strand and being urged in a first direction when demand for said strand increases, said pivotal member being comprised of an arm pivoted centrally of its ends, and a roller mounted on one end of said arm and having said strain trained thereabout to bias said arm in said first direction, control means operatively connected to said pivotal member and motive means for controlling the rate of movement of said strand pursuant to demand thereon, and fluid power means operatively connected to said pivotal member and urging same in a second direction to maintain a relatively constant tension on said strand, said fluid power means comprising a pneumatic cylinder with a piston movable therein, a cable connecting said arm on the same side Of the pivot point of said arm as said roller to said piston and means for supplying air under pressure to said cylinder to urge said piston in such manner to bias said pivotal member in said second direction.
Claim 2
Independent Claim
211 words
An apparatus for supplying a strand of material with relatively constant tension maintained thereon pursuant to demand for said strand, said apparatus comprising means for supplying said strand, motive means for moving said strand from said source to a point of demand, a pivotal member operatively associated with said strand and being urged in a first direction when demand for said strand increases, said pivotal member being comprised of an arm pivoted centrally of its ends, and a roller mounted on one end of said arm and having said strain trained thereabout to bias said arm in said first direction, control means operatively connected to said pivotal member and motive means for controlling the rate of movement of said strand pursuant to demand thereon, and fluid power means operatively connected to said pivotal member and urging same in a second direction to maintain a relatively constant tension on said strand, said fluid power means comprising a pneumatic cylinder with a piston movable therein, a cable connecting said arm on the same side Of the pivot point of said arm as said roller to said piston and means for supplying air under pressure to said cylinder to urge said piston in such manner to bias said pivotal member in said second direction.
Claim 3
Independent Claim
194 words
An apparatus for supplying a strand of material with relatively constant tension maintained thereon pursuant to demand for said strand, said apparatus comprising means for supplying said strand, motive means for moving said strand from said source to a point of demand, a pivotal member operatively associated with said strand and being urged in a first direction when demand for said strand increases, control means operatively connected to said pivotal member and motive means for controlling the rate of movement of said strand pursuant to demand thereon, said control means comprising a transducer which measures the positional change of said pivotal member as it pivots about its pivot point, means for introducing a first electrical signal representative of a first position of said pivotal member, means for generating a second electrical signal from pivotal movement of said pivotal member, means for comparing the phase difference of said first and second signals, and means for generating a corrective signal to said motive means in response to the phase difference and fluid power means operatively connected to said pivotal member and urging same in a second direction to maintain a relatively constant tension on said strand.
Claim 4
Independent Claim
194 words
An apparatus for supplying a strand of material with relatively constant tension maintained thereon pursuant to demand for said strand, said apparatus comprising means for supplying said strand, motive means for moving said strand from said source to a point of demand, a pivotal member operatively associated with said strand and being urged in a first direction when demand for said strand increases, control means operatively connected to said pivotal member and motive means for controlling the rate of movement of said strand pursuant to demand thereon, said control means comprising a transducer which measures the positional change of said pivotal member as it pivots about its pivot point, means for introducing a first electrical signal representative of a first position of said pivotal member, means for generating a second electrical signal from pivotal movement of said pivotal member, means for comparing the phase difference of said first and second signals, and means for generating a corrective signal to said motive means in response to the phase difference and fluid power means operatively connected to said pivotal member and urging same in a second direction to maintain a relatively constant tension on said strand.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |