US3705488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for producing a high degree of twist in yarn
Assignee: Warner and Swasey Co
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Filing: 1971-05-20
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Granted: 1972-12-12
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Expires: 1991-05-20
Abstract
Abstract Yarn texture is imparted with a high degree of twist, and at a high speed, to a continuous multifilament yarn; a low friction anvil member is spaced closely from a mating movable friction member. They thus form a barrier through which the yarn to be twisted cannot pass. The yarn is urged toward the barrier and toward the moving friction surface. High twist levels are attained by not only contacting the yarn with the moving friction surface but by wrapping it partially around such surface.
Inventors
- 👤 William C Sholly Jr
- 👤 George A Carruthers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:28
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/04; D02G1/08; D02G1/082
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
83 words
In a yarn false twisting apparatus comprising a movable member having a friction surface, anvil means providing a low friction surface adjacent said friction surface and positioned so closely as to form a barrier therebetween, through which said yarn does not pass, said friction surface having an edge portion extending toward said yarn, and yarn feeding and guide means arranged for continuously urging said yarn toward and into frictional engagement with said friction surfaCe, and wrapping at least partially around said edge portion.
Claim 2
Dependent Claim
83 words
In a yarn false twisting apparatus comprising a movable member having a friction surface, anvil means providing a low friction surface adjacent said friction surface and positioned so closely as to form a barrier therebetween, through which said yarn does not pass, said friction surface having an edge portion extending toward said yarn, and yarn feeding and guide means arranged for continuously urging said yarn toward and into frictional engagement with said friction surfaCe, and wrapping at least partially around said edge portion.
Claim 3
Dependent Claim
15 words
The apparatus defined in claim 1, wherein said edge portion is at least partially curved.
Claim 4
Dependent Claim
30 words
A yarn false twisting apparatus as recited in claim 1, wherein said movable member has a circumferential friction surface curved at its edge toward the axis of said friction member.
Claim 5
Dependent Claim
30 words
An improved yarn false twisting device, as recited in claim 3, wherein said anvil means is freely rotatable and has an axis parallel with that of said rotatable friction member.
Claim 6
Dependent Claim
22 words
An improved yarn false twisting device, as recited in claim 4, wherein said anvil has a hard, flat, smooth outer circumferential surface.
Claim 7
Dependent Claim
30 words
An improved yarn false twisting device, as recited in claim 4, wherein the yarn paths entering and leaving said barrier are at an angle of from about 60* to 170*.
Claim 8
Dependent Claim
27 words
An improved yarn false twisting device, as recited in claim 4, wherein said movable member having a friction surface comprises a wheel with a circumferential frictional ring.
Claim 9
Dependent Claim
79 words
An improved yarn false twisting device, as recited in claim 4, wherein a plurality sets of said rotating friction members with friction surfaces and adjacent low friction surface means are disposed adjacent one another on two common axes, friction members and low friction surface means being immediately adjacent one another on each of said axes, each of said friction members having a radius larger than that of at least one of said low friction surface means immediately adjacent thereto.
Claim 10
Dependent Claim
22 words
An improved yarn false twisting device, as recited in claim 8, wherein all of said friction members are of substantially equal radius.
Claim 11
Dependent Claim
25 words
An improved yarn false twisting device, as recited in claim 9, wherein said friction members are rotated by frictional engagement with a cylindrical driving means.
Claim 12
Dependent Claim
34 words
False twist apparatus defined in claim 1, wherein said guide means is arranged to cause the yarn to wrap not only from side to side around said edge, but up and down as well.
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |