US3777467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for false-twisting multifilament threads and the like
Assignee: Savio SpA
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Filing: 1972-07-17
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Granted: 1973-12-11
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Expires: 1992-07-17
Abstract
Abstract A first false-twisting unit includes three axially parallel shafts of which two carry pairs of cooperating rotary friction members defining respective nips through which the travelling yarn passes for false-twisting and on a third of which a driven friction-drive roller is provided to drive the friction members. A second false-twisting unit includes a first roller coaxial with the friction-drive roller having an axial length substantially greater than the rotary friction members, and a second roller rotatably mounted in axial parallelism with the first roller and engaging the latter with its periphery to form with the first roller a second nip through which the travelling yarn passes to have a final false twist imparted to it and have its filaments moved into mutual parallelism. An arrangement is provided for traversing the second roller axially along the second roller.
Inventors
- 👤 H Enneking
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:20
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/04; D02G1/08; D02G1/082
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
In an apparatus for false-twisting travelling filamentary threads and the like, a combination comprising a first falsetwisting unit including three axially parallel shafts, pairs of cooperating rotary friction members provided on two of said shafts and forming respective first nips through which the travelling yarn passes to have a preliminary false twist imparted to it, and a driven friction-drive roller on the third of said shafts in driving engagement with the peripheries of said rotary friction members; and a second false-twisting unit including a first roller coaxial with said friction-drive roller and having an axial length substantially greater than said rotary friction members, a second roller rotatably mounted in axial parallelism with said first roller and having a periphery engaging that of said first roller and forming a second nip through which the travelling yarn passes to have a final twist imparted to it and to have its filaments moved into mutual parallelism, and traversing means traversing said second roller axially along said first roller.
Claim 2
Dependent Claim
165 words
In an apparatus for false-twisting travelling filamentary threads and the like, a combination comprising a first falsetwisting unit including three axially parallel shafts, pairs of cooperating rotary friction members provided on two of said shafts and forming respective first nips through which the travelling yarn passes to have a preliminary false twist imparted to it, and a driven friction-drive roller on the third of said shafts in driving engagement with the peripheries of said rotary friction members; and a second false-twisting unit including a first roller coaxial with said friction-drive roller and having an axial length substantially greater than said rotary friction members, a second roller rotatably mounted in axial parallelism with said first roller and having a periphery engaging that of said first roller and forming a second nip through which the travelling yarn passes to have a final twist imparted to it and to have its filaments moved into mutual parallelism, and traversing means traversing said second roller axially along said first roller.
Claim 3
Dependent Claim
23 words
A combination as defined in claim 1, wherein said first roller includes a mounting shaft which is axially aligned with said third shaft.
Claim 4
Dependent Claim
18 words
A combination as defined in claim 2, wherein said third shaft and mounting shaft are of one piece.
Claim 5
Dependent Claim
17 words
A combination as defined in claim 1, wherein said rotary friction members are of substantially disc-shaped configuration.
Claim 6
Dependent Claim
40 words
A combination as defined in claim 4, wherein said rotary friction members have respective rounded peripheRal edge faces, with the edge faces of the two rotary friction members of each pair being in contact and forming a respective first nip.
Claim 7
Dependent Claim
26 words
A combination as defined in claim 1, wherein said rotary friction members are mounted on said two shafts with freedom of rotation relative to the latter.
Claim 8
Dependent Claim
54 words
A combination as defined in claim 1, wherein said pairs of rotary friction members include a terminal pair; and wherein said second unit is arranged so that the yarn travels in a substantially straight path from the first nip of said terminal pair to said second nip formed by said first and second rollers.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |