US3858385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic yarn piecing and knotting method and apparatus for the open-end spinning machine
Assignee: Howa Kogyo KK
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Filing: 1971-07-01
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Granted: 1975-01-07
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Expires: 1991-07-01
Abstract
Abstract A yarn piecing and knotting method and its apparatus utilized for the open-end spinning process. A supplementary yarn is utilized in one version, while another version is an application of a similar method to conventional yarn piecing. After completion of the yarn piecing operation, an upstream yarn delivering from a spinning rotor and a downstream yarn unwound from a yarn package are knotted and an excess portion of the upstream yarn which includes the portion containing the yarn piecing operation and a portion of the downstream yarn are cut off.
Inventors
- 👤 Kunio Shinkai
- 👤 Hazuo Yamada
- 👤 Kenji Sakaki
- 👤 Hironori Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:00
CPC Classifications
D; D01; D01H; D01H4/00; D01H4/48; D01H4/50; D01H15/00; D01H15/004
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
322 words
In an open-end spinning process, an improved method of yarn piecing and knotting when said yarn breaks, said process including the steps of; supplying liberated fibers into a spinning rotor rotating at high speed so that said liberated fibers are continuously deposited upon a fiber accumulation surface of said spinning rotor; removing a bundle of fibers from said fiber accumulation surface; twisting said removed bundle of fibers by high speed rotation of said spinning rotor; continuously delivering a twisted yarn from a delivery aperture of said spinning rotor; forming a yarn packAge from said delivered yarn; wherein said improved yarn piecing and knotting includes the steps of: preparing a predetermined reserve length of a supplementary yarn supplied from a source in a biased yarn path by means of a yarn reserve device said biased yarn path being V-shaped; feeding said supplementary yarn into said delivery aperture in the reverse direction to that of the normal running of a spun yarn until an end of said yarn reaches a zone affected by the centrifugal force created by said high speed rotation of said spinning rotor whereby said end of yarn is pieced with said bundle of fibers; taking up a twisted yarn from said delivery aperture of said spinning rotor so that an upstream yarn is formed; retrieving the broken end of said yarn from said yarn package and unwinding a predetermined length of said yarn from said yarn package so that a downstream yarn is formed; leading said downstream yarn and said upstream yarn along a predetermined passage in a parallel and close condition; knotting both of said yarns at a position in said predetermined passage; cutting the excess length of said upstream yarn which includes a portion containing said yarn piecing, and an excess portion of said downstream yarn; and, positioning said knotted yarn on a normal spinning yarn passage so that a normal spinning operation can be continuously carried out.
Claim 2
Dependent Claim
322 words
In an open-end spinning process, an improved method of yarn piecing and knotting when said yarn breaks, said process including the steps of; supplying liberated fibers into a spinning rotor rotating at high speed so that said liberated fibers are continuously deposited upon a fiber accumulation surface of said spinning rotor; removing a bundle of fibers from said fiber accumulation surface; twisting said removed bundle of fibers by high speed rotation of said spinning rotor; continuously delivering a twisted yarn from a delivery aperture of said spinning rotor; forming a yarn packAge from said delivered yarn; wherein said improved yarn piecing and knotting includes the steps of: preparing a predetermined reserve length of a supplementary yarn supplied from a source in a biased yarn path by means of a yarn reserve device said biased yarn path being V-shaped; feeding said supplementary yarn into said delivery aperture in the reverse direction to that of the normal running of a spun yarn until an end of said yarn reaches a zone affected by the centrifugal force created by said high speed rotation of said spinning rotor whereby said end of yarn is pieced with said bundle of fibers; taking up a twisted yarn from said delivery aperture of said spinning rotor so that an upstream yarn is formed; retrieving the broken end of said yarn from said yarn package and unwinding a predetermined length of said yarn from said yarn package so that a downstream yarn is formed; leading said downstream yarn and said upstream yarn along a predetermined passage in a parallel and close condition; knotting both of said yarns at a position in said predetermined passage; cutting the excess length of said upstream yarn which includes a portion containing said yarn piecing, and an excess portion of said downstream yarn; and, positioning said knotted yarn on a normal spinning yarn passage so that a normal spinning operation can be continuously carried out.
Claim 3
Dependent Claim
60 words
The improved yarn piecing and knotting method as recited in claim 1 wherein the step of feeding said supplementary yarn into said delivery aperture includes the step of: carrying an end of said supplementary yarn by means of a jet air current into an effective zone of the suction air stream of said spinning rotor flowing into said delivery aperture.
Claim 4
Dependent Claim
87 words
The improved yarn piecing and knotting method as recited in claim 2 where the step of carrying said end of said supplementary yarn is followed by the step of: feeding of said supplementary yarn in said reverse direction to that of the normal running of a spun yarn by releasing said yarn from said yarn reserve device until said end of said supplementary yarn reaches an effective zone of centrifugal force created by high speed rotation of said spinning rotor; and, simultaneously stopping said jet air current.
Claim 5
Dependent Claim
62 words
The improved yarn piecing and knotting method as recited in claim 3 where the step of stopping said jet air current is followed by the step of: commencing the feeding of said liberated fibers into said spinning rotor; and, engaging said supplementary yarn in the nip of the rotating take-up roller when said supplementary yarn is being fed in said reverse direction.
Claim 6
Dependent Claim
47 words
The improved yarn piecing and knotting method as recited in claim 1, including the step of: temporarily reserving a loosened yarn extending from said delivery aperture of said spinning rotor to the knotter by means of a suction device operating from the time of the knotting operation.
Claim 7
Dependent Claim
34 words
The improved yarn piecing and knotting method as recited in claim 5, including the step of: rotating a yarn package with higher speed so as to wind the reserved yarn on said suction device.
Claim 8
Dependent Claim
247 words
An improved yarn piecing and knotting apparatus for an open-end spinning machine provided with a plurality of spinning units, each unit having a spinning rotor provided with fiber accumulation surface and a delivery aperture, driving means for rotating said spinning rotor at a high speed, means for supplying liberated fibers into said spinning rotor so that said fibers are deposited upon said accumulation surface, leading means for an upstream yarn continuously taken from said delivery aperture and for leading a downstream yarn unwound from said yarn package along a predetermined passage, a knotter for knotting both yarns at a position on said predetermined passage, take-up means for taking up a twisted yarn from said delivery aperture, winding means for producing a yarn package from said yarn taken up from said delivery aperture, where the improvement cOmprises: means for reserving a predetermined length of a supplementary yarn supplied form a source and releasing it instantaneously; jet air current means for flowing an air current in the reverse direction to that of the normal running of spun yarn into said delivery aperture of the spinning rotor; means for feeding an end of yarn into said delivery aperture of said spinning rotor in the reverse direction to that of the normal running of a spun yarn when a spinning yarn is broken until said end reaches a zone affected by centrifugal force created by high speed rotation of said spinning rotor so that a piecing operation can be carried out.
Claim 9
Dependent Claim
247 words
An improved yarn piecing and knotting apparatus for an open-end spinning machine provided with a plurality of spinning units, each unit having a spinning rotor provided with fiber accumulation surface and a delivery aperture, driving means for rotating said spinning rotor at a high speed, means for supplying liberated fibers into said spinning rotor so that said fibers are deposited upon said accumulation surface, leading means for an upstream yarn continuously taken from said delivery aperture and for leading a downstream yarn unwound from said yarn package along a predetermined passage, a knotter for knotting both yarns at a position on said predetermined passage, take-up means for taking up a twisted yarn from said delivery aperture, winding means for producing a yarn package from said yarn taken up from said delivery aperture, where the improvement cOmprises: means for reserving a predetermined length of a supplementary yarn supplied form a source and releasing it instantaneously; jet air current means for flowing an air current in the reverse direction to that of the normal running of spun yarn into said delivery aperture of the spinning rotor; means for feeding an end of yarn into said delivery aperture of said spinning rotor in the reverse direction to that of the normal running of a spun yarn when a spinning yarn is broken until said end reaches a zone affected by centrifugal force created by high speed rotation of said spinning rotor so that a piecing operation can be carried out.
Claim 10
Dependent Claim
54 words
The improved yarn piecing and knotting apparatus according to claim 7, wherein said means of leading an end of yarn into said delivery aperture of said spinning rotor further comprises a holding device for holding an end of said supplementary yarn, and for leading said end of said supplementary yarn into said feeding device.
Claim 11
Dependent Claim
34 words
The improved yarn piecing and knotting apparatus according to claim 8 further comprising a third suction means for temporarily reserving an excess length of loosened yarn extending from said delivery aperture to the knotter.
Claim 12
Dependent Claim
24 words
The improved yarn piecing and knotting apparatus according to claim 9, wherein a supplementary yarn is a yarn drawn from a supplementary yarn package.
Claim 13
Dependent Claim
129 words
The improved yarn piecing and knotting apparatus according to claim 9, further comprising: first suction means for sucking an upstream yarn delivered from said delivery aperture of said spinning rotor after the cutting of the connection between said supplementary yarn package and said supply mechanism after completion of said piecing operation, said first suction means displacing said upstream yarn along a first predetermined passage; second suction means for retrieving a broken yarn end from said yarn package and for carrying a retrieved yarn (downstream yarn) along a second predetermined passage; and, auxiliary means for shifting a portion of said downstream yarn to a position adjacent to said first predetermined passage in a parallel condition so that said knotter can be operated at a postion in said first predetermiend passage.
Claim 14
Dependent Claim
82 words
The improved yarn piecing and knotting apparatus according to claim 11, further comprising: a carrier travelling along a predetermined carrier passage along said open-end spinning machine; detector means for detecting yarn break of any spinning units; means for stopping said carrier at a correct working position of said apparatus in front of a spinning unit where a spinning yarn is broken; program means for actuating and controlling the timing of said leading means; and retrieving means for retrieving a loosened spun yarn.
Claim 15
Dependent Claim
23 words
The improved yarn piecing and knotting apparatus according to claim 7, wherein a supplementary yarn is a yarn drawn from the yarn package.
References Cited (Backward Citations)
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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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |