US3813868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction false-twisting device
Assignee: Oerlikon Barmag AG
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Filing: 1972-12-04
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Granted: 1974-06-04
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Expires: 1992-12-04
Abstract
Abstract One or more groups of three or more endless friction surfaces are supported for rotation and engage and impart a false-twist to a thread engaged thereby as it moves in a path of travel substantially perpendicular to the path of movement of the rotating friction surfaces. The friction surfaces of each group are equally spaced apart and are sequentially engaged by the thread along contact points which lie on a screw-thread line, the pitch and direction of which is determined by the direction of rotation and the positioning of the friction surfaces. The textured yarn produced by the present false-twist device may have torque in either the S or Z direction, depending upon the direction of rotation and arrangement of the friction surfaces. The friction surfaces are disclosed in the form of endless belts, rotating disks having crowned outer circumferential surfaces, and rotating rings having curved inner yarn engaging surfaces.
Inventors
- 👤 H Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:28
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/04; D02G1/08; D02G1/082
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
125 words
A friction false-twist device adapted to produce crimped and curled thread by false-twisting the thread in either S or Z directions, said device including at least one group of at least three endless frictional surfaces of crowned cross-section, means for rotatably supporting the friction surfaces of each group in equally spaced apart position and for rotation in parallel planes substantially perpendicular to the direction of travel of a thread successively engaging said surfaces, and drive means for selectively rotating said frictional surfaces in clockwise and counterclockwise directions, said friction surfaces being supported for different sequential positioning so that the sequential contact points of said frictional surfaces with the thread lie on a screw-thread line preselected according to the direction of rotation of said frictional surfaces.
Claim 2
Dependent Claim
125 words
A friction false-twist device adapted to produce crimped and curled thread by false-twisting the thread in either S or Z directions, said device including at least one group of at least three endless frictional surfaces of crowned cross-section, means for rotatably supporting the friction surfaces of each group in equally spaced apart position and for rotation in parallel planes substantially perpendicular to the direction of travel of a thread successively engaging said surfaces, and drive means for selectively rotating said frictional surfaces in clockwise and counterclockwise directions, said friction surfaces being supported for different sequential positioning so that the sequential contact points of said frictional surfaces with the thread lie on a screw-thread line preselected according to the direction of rotation of said frictional surfaces.
Claim 3
Dependent Claim
28 words
A device according to claim 1 including means for adjustably supporting at least one of said frictional surfaces for movement toward and away from the remaining frictional surfaces.
Claim 4
Dependent Claim
28 words
A device according to claim 1 wherein said drive means includes means for driving certain of said frictional surfaces at a different speed from the remaining frictional surfaces.
Claim 5
Dependent Claim
18 words
A device according to claim 1 wherein said frictional surfaces are in the form of endless traveling belts.
Claim 6
Dependent Claim
75 words
A device according to claim 1 wherein said frictional surfaces are in the form of groups of three circular bodies of revolution rotating in the same direction, and including three shafts each supporting one of said bodies of revolution of each group, means supporting said shafts for rotation with said bodies of rotation in partially overlapped position, and wherein the bodies of rotation of at least two of said shafts are interchangeable in their sequence.
Claim 7
Dependent Claim
19 words
A device according to claim 5 wherein said bOdies of rotation consist of round disks having ball-shaped circumferential surfaces.
Claim 8
Dependent Claim
67 words
A device according to claim 6 wherein the rotational centers of said three shafts are positioned at the corners of an equilateral triangle and are spaced 65 millimeters apart, said round disks including a plastic frictional outer surface and having a radius of 45 millimeters to provide sufficient overlap that the triangular sides of the path of downward travel of the thread are each 1.8 millimeters long.
Claim 9
Dependent Claim
67 words
A device according to claim 6 wherein the rotational centers of said three shafts are positioned at the corners of an equilateral triangle and are spaced 65 millimeters apart, said round disks including a steel frictional outer surface and having a radius of 50 millimeters to provide sufficient overlap that the triangular sides of the path of downward travel of the thread are each 9.4 millimeters long.
Claim 10
Dependent Claim
75 words
A device according to claim 1 wherein said frictional surfaces are in the form of groups of four circular bodies of revolution rotating in the same direction, and including four shafts each supporting one of said bodies of revolution of each group, means supporting said shafts for rotation with said bodies of rotation in partially overlapped position, and wherein the bodies of rotation of at least three of said shafts are interchangeable in their sequence.
Claim 11
Dependent Claim
22 words
A device according to claim 1 wherein said frictional surfaces are in the form of sleeves having ball-shaped inner yarn engaging surfaces.
Claim 12
Dependent Claim
38 words
A device according to claim 1 wherein said frictional surfaces are in the form of groups of circular bodies of revolution rotating in the same direction, and wherein certain of said circular bodies of revolution have different radii.
Claim 13
Dependent Claim
49 words
A device according to claim 5 including an additional group of bodies of revolution in advance of said recited groups of bodies of revolution, said additional groups of bodies of revolution being supported on shafts which are driven from said shafts supporting said recited groups of bodies of revolution.
Claim 14
Dependent Claim
29 words
A device according to claim 12 including means for driving said additional groups of bodies of revolution at a different speed from said recited groups of bodies of revolution.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |