US4384448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ring spinning frame
Assignee: Solutia Inc
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Filing: 1980-11-03
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Granted: 1983-05-24
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Expires: 2000-11-03
Abstract
Abstract Improvements in conventional ring spinning processes of the type wherein a strand of staple fibers if drafted, twisted and collected on a ring spinning frame are obtained by the added step of subjecting the strand to the twisting action of a pneumatic false twister between the drafting and collecting steps. The added step improves performance and/or permits the process to be operated at higher front roll delivery speeds for any given spindle speed without sacrificing performance. The higher delivery speeds results in improvements in the productivity of the process and the apparent value of staple yarn produced thereby.
Inventors
- 👤 Arnold E. Wilkie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:48
CPC Classifications
D; D01; D01H; D01H7/00; D01H7/02; D01H7/90; D01H1/00; D01H1/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
145 words
In a ring spinning process wherein a strand of staple fibers is drafted to a desired count, forwarded by means of a pair of nip rolls, twisted while being forwarded by means of a rotating spindle, and collected on a bobbin mounted on said spindle by means of a ring-and-traveler take-up mechanism, the improvement comprising in combination (a) the added step of subjecting said strand as it is being forwarded to the twisting action of a pneumatic false twister, wherein the temporary twist inserted in the strand by said twisting action and the twist inserted in the strand by said spindle are in the same direction, and (b) forwarding the strand at a higher speed than is possible if said additional step were omitted, whereby the productivity of the process is increased and the twist level of the strand produced by the process is reduced.
Claim 2
Dependent Claim
145 words
In a ring spinning process wherein a strand of staple fibers is drafted to a desired count, forwarded by means of a pair of nip rolls, twisted while being forwarded by means of a rotating spindle, and collected on a bobbin mounted on said spindle by means of a ring-and-traveler take-up mechanism, the improvement comprising in combination (a) the added step of subjecting said strand as it is being forwarded to the twisting action of a pneumatic false twister, wherein the temporary twist inserted in the strand by said twisting action and the twist inserted in the strand by said spindle are in the same direction, and (b) forwarding the strand at a higher speed than is possible if said additional step were omitted, whereby the productivity of the process is increased and the twist level of the strand produced by the process is reduced.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said fibers are composed of nylon.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein said nylon is nylon 66.
Claim 5
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 6
Dependent Claim
12 words
The product of claim 4 wherein said fibers are composed of nylon.
Claim 7
Dependent Claim
13 words
The product of claim 5 wherein said fibers are composed of nylon 66.
Claim 8
Dependent Claim
111 words
In a ring spinning frame position of the type comprising: means for drafting a strand of staple fibers to a desired count, said means including a pair of nip rolls for forwarding said strand from said drafting means; a ring-and-traveler take-up mechanism for receiving said strand and winding said strand onto a bobbin mounted on a rotatable spindle, said spindle being adapted to insert twist in said strand as said strand is being forwarded to said take-up mechanism; the improvement comprising a pneumatic false twister disposed between said nip rolls and said take-up mechanism for providing twist in said strand in the same direction as the rotational direction of said spindle.
Claim 9
Dependent Claim
111 words
In a ring spinning frame position of the type comprising: means for drafting a strand of staple fibers to a desired count, said means including a pair of nip rolls for forwarding said strand from said drafting means; a ring-and-traveler take-up mechanism for receiving said strand and winding said strand onto a bobbin mounted on a rotatable spindle, said spindle being adapted to insert twist in said strand as said strand is being forwarded to said take-up mechanism; the improvement comprising a pneumatic false twister disposed between said nip rolls and said take-up mechanism for providing twist in said strand in the same direction as the rotational direction of said spindle.
Claim 10
Dependent Claim
26 words
The spinning frame position of claim 7 wherein said twister is disposed at a distance of from about 5 to 15 cm from said nip rolls.
Claim 11
Dependent Claim
23 words
The spinning frame position of claim 8 wherein said twister serves as the sole guide between said nip rolls and said take-up mechanism.
References Cited (Backward Citations)
US2091153A
Cited
US2515299A
Cited
GB674122A
Cited
US2590374A
Cited
US2838903A
Cited
FR1150000A
Cited
US3079745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |