US3813867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for producing false twist on a thermoplastic filament
Assignee: SPINNER OSAKEYHTIO SF
•
Filing: 1972-04-05
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Granted: 1974-06-04
•
Expires: 1992-04-05
Abstract
Abstract A device for producing a false twist on a thermoplastic filament which, heated to a plastic condition, is on its path of travel made to touch an endless belt moving transversally with reference to it, and which belt has high friction against the filament and has been conducted over a pulley imparting a motion to it. For stabilizing the point of contact between the filament and belt the belt forms at this point a sharp bend, which prevents the hunting of the filament.
Inventors
- 👤 O Ivanto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:24
CPC Classifications
D; D02; D02G; D02G1/00; D02G1/02; D02G1/04; D02G1/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
90 words
Improvement in a device for producing a false twist on a thermoplastic filament which, heated to a plastic condition, is on its path of travel made to touch an endless belt moving transversally with reference to it, and which belt has high friction against the filament and has been conducted over a pulley imparting a motion to it, wherein the improvement comprises that for stabilizing the point of contact between the filament and belt the belt forms at this point a sharp bend, which prevents the hunting of the filament.
Claim 2
Dependent Claim
90 words
Improvement in a device for producing a false twist on a thermoplastic filament which, heated to a plastic condition, is on its path of travel made to touch an endless belt moving transversally with reference to it, and which belt has high friction against the filament and has been conducted over a pulley imparting a motion to it, wherein the improvement comprises that for stabilizing the point of contact between the filament and belt the belt forms at this point a sharp bend, which prevents the hunting of the filament.
Claim 3
Dependent Claim
21 words
Device according to claim 1, characterized in that the bend in the belt is produced by traction caused by the filament.
Claim 4
Dependent Claim
25 words
Device according to claim 1, characterized in that the bend in the belt is produced by elements guiding the belt, such as freely rotating rolls.
Claim 5
Dependent Claim
62 words
Device according to claim 1, characterized in that the bend in the belt is produced by a freely rotating roll placing tension on the belt, which roll has low friction against the filament, and that the filament has been conducted into the gap between the belt and the roll from such a direction that it touches both the belt and the roll.
Claim 6
Dependent Claim
41 words
Device according to claim 1, characterized in that the bend in the belt is produced by a magnet attracting the belt and that the belt, to this purpose, consists of a magnetic material, for instance of plastic with metal powder admixture.
Claim 7
Dependent Claim
22 words
Device according to claim 5, characterized in that the pulley is magnetic for improvement of the friction between it and the belt.
Claim 8
Dependent Claim
30 words
Device according to claim 1, chaRacterized in that the bend in the belt is produced by an air nozzle, which by compressed air effect pushes the belt towards the filament.
Claim 9
Dependent Claim
52 words
Device according to claim 7, characterized in that the air nozzle has for the belt a groove having in its bottom a slit, through which compressed air is supplied so that between the groove and the belt an air cushion is formed, which keeps the belt at a distance from the groove.
References Cited (Backward Citations)
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US3035396A
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US3045416A
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US3103097A
Cited
US3228181A
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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 |