Patent US3636731A successfully refreshed from Google Patents.
US3636731A
Expired / Lapsed
US
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Tension-relaxing device for feeding filling threads to a warp knitting machine
Assignee: Individual
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Filing: 1970-08-04
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Granted: 1972-01-25
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Expires: 1990-08-04
Abstract
Abstract In a multiple-package filling-thread-feeding device for warp knitting machines of the so-called ''''carousel'''' type in which thread from a plurality of packages which are moved around by an endless chain is fed to transfer chains provided with pins which carry the filling or weft threads to the knitting line, the motion of the packages stretches successive filling thread lengths from the pins on one chain to the pin on the other. These threads each pass through a tension device between two springpressed discs, the tension device for each package moving with it. On the warp knitting machine frame is a cam somewhat shorter than the distance between chains, which cam contacts a rod or follower in each tension device and spreads the discs apart by a wedge at one end while the filling thread is fed out from each package, tension being renewed for a short distance at either end of the length of filling thread from chain to chain.
Inventors
- 👤 Robert F Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:49
CPC Classifications
D; D04; D04B; D04B23/00; D04B23/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
248 words
In a weft-thread-feeding device for warp knitting machines comprising first and second endless carriers with yarn clamping means thereon for opening and closing to clamp on weft threads, a third endless carrier provided with a plurality of yarn packages, each package having associated with it and moving therewith a tensioning means for the yarn, the endless carriers being synchronously driven and positioned so that as a package comes adjacent to the clamping means on the first carrier, the clamping means opens, clamps the yarn from the package, and the yarn is then strung over to a corresponding clamping means on the second carrier by the movement of the third carrier for the packages and is clamped on said second carrier and the yarn cut, the improvement in which each yarn-tensioning means includes means for applying tension to the yarn intermittently, and means, controlled by the position of a package between the first and second carriers, for actuating said yarn tension-applying means, tension being applied as the yarn is grasped by the clamping means on the first carrier and maintained for a short distance beyond, the tension then being released until the package approaches the clamping means on the second carrier and reactuated for a short distance as the package transfers its yarn to said clamping means on the second carrier, the yarn being tension free during the major portion of the travel of each package between carriers and strains on the yarn and excessive lint formation thereby avoided.
Claim 2
Dependent Claim
248 words
In a weft-thread-feeding device for warp knitting machines comprising first and second endless carriers with yarn clamping means thereon for opening and closing to clamp on weft threads, a third endless carrier provided with a plurality of yarn packages, each package having associated with it and moving therewith a tensioning means for the yarn, the endless carriers being synchronously driven and positioned so that as a package comes adjacent to the clamping means on the first carrier, the clamping means opens, clamps the yarn from the package, and the yarn is then strung over to a corresponding clamping means on the second carrier by the movement of the third carrier for the packages and is clamped on said second carrier and the yarn cut, the improvement in which each yarn-tensioning means includes means for applying tension to the yarn intermittently, and means, controlled by the position of a package between the first and second carriers, for actuating said yarn tension-applying means, tension being applied as the yarn is grasped by the clamping means on the first carrier and maintained for a short distance beyond, the tension then being released until the package approaches the clamping means on the second carrier and reactuated for a short distance as the package transfers its yarn to said clamping means on the second carrier, the yarn being tension free during the major portion of the travel of each package between carriers and strains on the yarn and excessive lint formation thereby avoided.
Claim 3
Dependent Claim
32 words
A device according to claim 1 in which the carrier for the packages rotates in a vertical plane and the packages extend horizontally toward the plane of the first and second carriers.
Claim 4
Dependent Claim
134 words
A device according to claim 2 in which the yarn-tension-applying means comprise two discs, spring urged against each other, and between which the yarn passes, and the means for actuating said yarn-tension-applying means is a rod with a wedge-shaped end adjacent the discs and spring-urged away from the discs, and a cam, stationary with respect to the moving packages, contacting the other end of each rod and positioned and shaped so that as each package of weft yarn passes beyond the clamping means on the first carrier, the rod is forced by the cam profile between thE discs, relieving tension, and just before a package reaches the clamping means on the second carrier the cam profile drops and the rod moves under spring pressure to restore contact between the discs and hence yarn tension.
Claim 5
Dependent Claim
134 words
A device according to claim 1 in which the yarn-tension-applying means comprise two discs, spring urged against each other, and between which the yarn passes, and the means for actuating said yarn-tension-applying means is a rod with a wedge-shaped end adjacent the discs and spring-urged away from the discs, and a cam, stationary with respect to the moving packages, contacting the other end of each rod and positioned and shaped so that as each package of weft yarn passes beyond the clamping means on the first carrier, the rod is forced by the cam profile between the discs, relieving tension, and just before a package reaches the clamping means on the second carrier the cam profile drops and the rod moves under spring pressure to restore contact between the discs and hence yarn tension.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |