Patent JPS62165884A successfully refreshed from Google Patents.
US3601969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for performing an open-end spinning operation
Assignee: Toray Industries Inc
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Filing: 1969-01-27
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Granted: 1971-08-31
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Expires: 1989-01-27
Abstract
Abstract A method and apparatus for operating a yarn in an open end spinning system utilizing pneumatic suction force and a centrifugal force due to a high speed rotation of the spinning rotor at a time of stopping or restarting the spinning operation. Tension of the spinning yarn delivered from the rotor is detected. By positively insertion of the yarn into the rotor when a yarn tension below a predetermined value is detected, an upstream yarn end is maintained in the rotor without any contact with fibers accumulated upon the inside wall of the rotor during abnormal rotation of the rotor. The mentioned contact is revived when a normal rotation is recovered. Combination of a mechanical insertion mechanism with a pneumatic insertion mechanism assures further preferable result in the yarn piecing operation.
Inventors
- 👤 Kozo Susami
- 👤 Masaaki Tabata
- 👤 Masakazu Hirota
- 👤 Keiichi Minami
- 👤 Teiryo Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:03
CPC Classifications
D; D01; D01H; D01H4/00; D01H4/48; D01H4/50
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
107 words
An open end spinning method comprising: providing a fiber bundle of individually separated fibers; conveying said fiber bundle to an open-ended spinning zone; spinning said fibers in said open-ended spinning zone into a spun yarn and delivering the spun yarn under tension therefrom; continuously detecting the tension of the spun yarn and providing an output signal whenever the tension falls below a predetermined value indicative of a defective spinning operation; and automatically terminating the delivery of said fiber bundle to said open-ended spinning zone followed by fluidly introducing a portion of the spun yarn back into said open-ended spinning zone both in response to said output signal.
Claim 2
Dependent Claim
107 words
An open end spinning method comprising: providing a fiber bundle of individually separated fibers; conveying said fiber bundle to an open-ended spinning zone; spinning said fibers in said open-ended spinning zone into a spun yarn and delivering the spun yarn under tension therefrom; continuously detecting the tension of the spun yarn and providing an output signal whenever the tension falls below a predetermined value indicative of a defective spinning operation; and automatically terminating the delivery of said fiber bundle to said open-ended spinning zone followed by fluidly introducing a portion of the spun yarn back into said open-ended spinning zone both in response to said output signal.
Claim 3
Dependent Claim
76 words
A method according to claim 1; wherein said conveying step comprises entraining said fiber bundle in a first fluid stream to convey same to said open-ended spinning zone; wherein said terminating step comprises rendering ineffective said first fluid stream in response to said output signal; and wherein said introducing step comprises entraining the spun yarn portion in a second fluid stream to introduce same back into said open-ended spinning zone in response to said output signal.
Claim 4
Dependent Claim
16 words
A method according to claim 2; including stopping said spinning step prior to said introducing step.
Claim 5
Dependent Claim
132 words
An open end spinning method comprising: pneumatically transporting a fiber bundle of individually libeRated fibers to an open-ended spinning rotor having a delivery pipe connected to its downstream end; rotating said open-ended spinning rotor at a given speed to effect spinning of said fiber bundle into a twisted yarn accompanied by delivery thereof through said delivery pipe; taking up in one direction said twisted yarn delivered from said delivery pipe under tension; continuously detecting the tension of said twisted yarn passing through said delivery pipe and providing an output signal whenever the tension falls below a predetermined value indicative of a yarn separation from said fiber bundle; and introducing the training end of the separated yarn through said delivery pipe back into said open-ended spinning rotor in response to said output signal.
Claim 6
Dependent Claim
132 words
An open end spinning method comprising: pneumatically transporting a fiber bundle of individually libeRated fibers to an open-ended spinning rotor having a delivery pipe connected to its downstream end; rotating said open-ended spinning rotor at a given speed to effect spinning of said fiber bundle into a twisted yarn accompanied by delivery thereof through said delivery pipe; taking up in one direction said twisted yarn delivered from said delivery pipe under tension; continuously detecting the tension of said twisted yarn passing through said delivery pipe and providing an output signal whenever the tension falls below a predetermined value indicative of a yarn separation from said fiber bundle; and introducing the training end of the separated yarn through said delivery pipe back into said open-ended spinning rotor in response to said output signal.
Claim 7
Dependent Claim
88 words
A method according to claim 4; wherein said introducing step comprises, in the following sequence, simultaneously stopping both the transporting of said fiber bundle and the taking-up of said twisted yarn, stopping rotation of said open-ended spinning rotor, and providing a fluid stream effective to carry said trailing yarn end through said delivery pipe into said open-ended spinning rotor when said taking-up step is reversed, and reversing the direction of operation of said taking-up step, whereby said trailing yarn end is carried back into said open-ended spinning rotor.
Claim 8
Dependent Claim
62 words
A method according to claim 5; comprising after said reversing step, again rotating said open-ended spinning rotor to reunite said trailing yarn end with said fiber bundle, rendering ineffective said fluid stream when the tension of the reunited yarn is greater than said predetermined value, and then restarting both the transporting of said fiber bundle and the taking-up of said twisted yarn.
Claim 9
Dependent Claim
30 words
A method according to claim 6; wherein said restarting of the taking-up of said twisted yarn occurs after the rotational speed of said open-ended spinning rotor reaches said given speed.
Claim 10
Dependent Claim
73 words
A method according to claim 6, including maintaining said trailing yarn end in said spinning rotor by entraining same in said fluid stream without contacting an interior peripheral wall of said spinning rotor during an abnormal rotation of said spinning rotor and permitting said trailing yarn end to come into contact with fibers accumulated upon said interior peripheral wall of said spinning rotor when a normal rotation of said spinning rotor is reached.
Claim 11
Dependent Claim
46 words
A method according to claim 8, wherein said trailing yarn end is maintained within said delivery pipe during said abnormal rotation of said spinning rotor and is led into said spinning rotor by said fluid stream when said normal rotation of said spinning rotor is reached.
Claim 12
Dependent Claim
144 words
In combination: an open-ended, rotationally driven, spinning rotor receptive during operation of a fiber bundle of individually liberated fibers to spin the fiber bundle into a spun yarn and having a delivery pipe connected thereto through which the spun yarn is delivered; supply means for supplying a fiber bundle of individually liberated fibers to said open-ended spinning rotor; detecting means disposed downstream from said delivery pipe for continuously detecting the tension of the spun yarn and providing an output signal whenever the yarn tension decreases below a predetermined value indicative of a yarn separation; interrupting means for interrupting the supplying of said fiber bundle to said open-ended spinning rotor in response to said output signal; and introducing means for fluidly introducing an end portion of the separated yarn back through said delivery pipe into said open-ended spinning rotor in response to said output signal.
Claim 13
Dependent Claim
144 words
In combination: an open-ended, rotationally driven, spinning rotor receptive during operation of a fiber bundle of individually liberated fibers to spin the fiber bundle into a spun yarn and having a delivery pipe connected thereto through which the spun yarn is delivered; supply means for supplying a fiber bundle of individually liberated fibers to said open-ended spinning rotor; detecting means disposed downstream from said delivery pipe for continuously detecting the tension of the spun yarn and providing an output signal whenever the yarn tension decreases below a predetermined value indicative of a yarn separation; interrupting means for interrupting the supplying of said fiber bundle to said open-ended spinning rotor in response to said output signal; and introducing means for fluidly introducing an end portion of the separated yarn back through said delivery pipe into said open-ended spinning rotor in response to said output signal.
Claim 14
Dependent Claim
67 words
A combination according to claim 10; wherein said supply means includes means for developing a first fluid stream entraining therein said fiber bundle; said introducing means comprises means for developing a second fluid stream flowing through said delivery pipe into said open-ended spinning rotor effective to entrain therein said yarn end portion and introduce same back into said open-ended spinnIng rotor in response to said output signal.
Claim 15
Dependent Claim
67 words
A combination according to claim 11; wherein said interrupting means includes valve means operable in a first mode in the absence of said output signal to effect formation of said first fluid stream while preventing formation of said second fluid stream and a second mode in response to said output signal to effect formation of said second fluid stream while preventing formation of said first fluid stream.
Claim 16
Dependent Claim
52 words
A combination according to claim 12, wherein said introducing means further comprises mechanical means for mechanically carrying said yarn end portion in an upstream direction toward said rotor simultaneously with the flowing of said second fluid stream, said mechanical positive means being disposed at a position downstream of said second fluid stream.
Claim 17
Dependent Claim
40 words
A combination according to claim 13, wherein said mechanical means is a pair of relatively movable nip rollers positioned in noncontact relationship during the normal spinning operation and movable into contact with each other in response to said output signal.
Claim 18
Dependent Claim
34 words
A combination according to claim 14, further comprising time-lag means attached to said mechanical means for starting contact movement of said nip rollers with a time-lag after said detecting means provides said output signal.
Claim 19
Dependent Claim
126 words
A combination according to claim 13, wherein said mechanical means comprises two pairs of rollers disposed in succession at positions below said second fluid stream, one of said pairs of rollers always contact each other and are rotating toward a takeup direction while the other pair of rollers always contact each other and are rotating toward the upstream direction which is reverse to said takeup direction, a guide lever operative to alternatively lead said yarn to nip points of said pairs of rollers in accordance with said output signal of said detecting means, thereby when said detecting means detects yarn tension below a definite value, said guide lever leads said yarn to a nip point said pair of rollers rotating toward upstream direction and vice versa.
Claim 20
Dependent Claim
39 words
A combination according to claim 16, wherein said mechanical means further comprises means for changing the length of the spun yarn path of travel between said pairs of rollers and said taking-up means in response to said output signal.
Claim 21
Dependent Claim
72 words
A combination according to claim 13, wherein said mechanical means comprises a rotating roller and a pair of auxiliary rollers contacting at symmetrical opposite positions of said rotating roller, means for alternatively leading said yarn to a nip point of one of said auxiliary rollers with said rotating roller or a nipt point of the other auxiliary rollers with said rotating roller in accordance with said output signal of said detecting means.
Claim 22
Dependent Claim
32 words
A combination according to claim 13, wherein said mechanical means is a pair of nip rollers whose direction of rotation is reversed in accordance with an output signal of said detecting means.
Claim 23
Dependent Claim
31 words
A combination according to claim 19, wherein the distance between said downstream terminal of said delivery pipe and a nip point of said nip rollers is not larger than 10 mm.
Claim 24
Dependent Claim
33 words
A combination according to claim 13, wherein said mechanical means is a pair of nip apron belts whose rotating direction is reversed in accordance with an output control signal of said detecting means.
Claim 25
Dependent Claim
57 words
A combination according to claim 12, including a yarn end holding tube slidably and coaxially disposed within said delivery pipe in such a manner that said yarn end holding tube projects into said spinning rotor during abnormal rotation of said spinning rotor while said tube recedes into said delivery pipe during normal rotation of said spinning rotor.
Claim 26
Dependent Claim
45 words
A combination according to claim 11, further comprising a source of suction, and an air suction tube connected to said source of suction and coaxially disposed to said spinning rotor to effect suction of said yarn end portion during abnormal rotation of said spinning rotor.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |