US4149366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threading method and threading devices for disc-type friction twisters
Assignee: Bayer AG
•
Filing: 1977-12-08
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Granted: 1979-04-17
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Expires: 1997-12-08
Abstract
Abstract Threading procedure in the texturing method for endless filaments in false-twist texturing machines comprising disc-type twisters.
Inventors
- 👤 Dieter Bass
- 👤 Joachim Fogger
- 👤 Udo Hansel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:40
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/04; D02G1/08; D02G1/082
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
208 words
A method of false-twist texturing of endless filament yarn which consists at least partly of thermoplastic manmade materials, wherein the yarn is textured in a false-twist texturing machine comprising disc-type twisters which consist of three disc sets which rotate in the same direction and which are arranged on three parallel shafts forming the corner points of an equilateral triangle and having fixed spacings in such a way that the discs overlap one another in the manner of spiral stairs and, in operation, the yarn travels through the twisters along a spiral three-dimensional curve, and wherein (a) the texturing machine and twisters operate at speeds which correspond to a texturing speed of from 700 to 1500 m/minute, (b) the feed yarn is run onto a waste take-up during the threading procedure, (c) the yarn is delivered in steps by only one disc of one shaft at a time into the region of the disc overlap, (d) the yarn is not subjected to the draft or overfeed required for texturing, determined by the different delivery and take-up speeds, till it is travelling through the twister along its spiral three-dimensional curve, and (e) the yarn is transferred from the waste device to the take-up tube on completion of the threading procedure.
Claim 2
Independent Claim
208 words
A method of false-twist texturing of endless filament yarn which consists at least partly of thermoplastic manmade materials, wherein the yarn is textured in a false-twist texturing machine comprising disc-type twisters which consist of three disc sets which rotate in the same direction and which are arranged on three parallel shafts forming the corner points of an equilateral triangle and having fixed spacings in such a way that the discs overlap one another in the manner of spiral stairs and, in operation, the yarn travels through the twisters along a spiral three-dimensional curve, and wherein (a) the texturing machine and twisters operate at speeds which correspond to a texturing speed of from 700 to 1500 m/minute, (b) the feed yarn is run onto a waste take-up during the threading procedure, (c) the yarn is delivered in steps by only one disc of one shaft at a time into the region of the disc overlap, (d) the yarn is not subjected to the draft or overfeed required for texturing, determined by the different delivery and take-up speeds, till it is travelling through the twister along its spiral three-dimensional curve, and (e) the yarn is transferred from the waste device to the take-up tube on completion of the threading procedure.
Claim 3
Dependent Claim
31 words
The method of claim 1, wherein the twister comprises four discs with a high coefficient of friction and an entry disc and an exit disc with a low coefficient of friction.
Claim 4
Dependent Claim
27 words
The method of claim 1, wherein the twister comprises five discs with a high coefficient of friction and an exit disc with a low coefficient of friction.
Claim 5
Dependent Claim
45 words
The method of claim 1, wherein the step-by-step delivery of the yarn by only one disc at a time is obtained by gradually increasing the yarn tension behind the twister and the yarn travels through a filament guide in front of and behind the twister.
Claim 6
Dependent Claim
26 words
The method of claim 4, wherein the twister is arranged inclined towards the direction of the yarn path corresponding to the "natural" entry and exit angle.
Claim 7
Dependent Claim
44 words
The method of claim 4, wherein the direction of the yarn path in front of the twister and the axial direction of the disc shafts are substantially parallel to one another, but wherein the yarn leaves the last disc at its "natural" exit angle.
Claim 8
Dependent Claim
15 words
The method of claim 6, wherein the take-up unit is arranged offset behind the twister.
Claim 9
Dependent Claim
66 words
The method of claim 1, wherein individually pivotal filament guides are provided which release the yarn in steps from a loop around the discs so that the yarn is only taken up by one disc of shaft at a time and fixed filament guides keep the yarn away from the discs of a second shaft during its travel into the region of the common disc overlap.
Claim 10
Dependent Claim
16 words
The method of claim 8, wherein at least one of the filament guides is pivotally arranged.
References Cited (Backward Citations)
US3872661A
Cited
US3911661A
Cited
US3955350A
Cited
US3973383A
Cited
US4059948A
Cited
US4050229A
Cited
US3998041A
Cited
US4047374A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |