Patent US2177217A successfully refreshed from Google Patents.
US4055942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for piecing a thread on open-end spinning units
Assignee: Individual
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Filing: 1976-02-06
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Granted: 1977-11-01
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Expires: 1996-02-06
Abstract
Abstract In piecing a thread, it is important for each piecing operation to be performed under uniform conditions. In order to provide uniform conditions for the area of the fibre feed, the fibre tuft offered to the opening means is trimmed in a certain manner, which is then the same for every piecing operation, before the sliver feed is switched on.
Inventors
- 👤 Fritz Stahlecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:01
CPC Classifications
D; D01; D01H; D01H4/00; D01H4/48; D01H4/50
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
173 words
A method for piecing a thread on open-end spinning units, in which a thread is returned to a spinning rotor, placed on a ring of fibres deposited in said spinning rotor, and then drawn off again, in which said ring of fibres is formed from fibres removed from an opened sliver, with said sliver being offered to opening means by feed means in the form of a fibre tuft; further comprising: shortening of a fibre tuft to form predetermined short fibres with said feed means switched off, switching said feed means on for producing a ring of shortened fibres in said spinning rotor, wherein the spinning rotor runs up from its stopped condition to its operating speed during the piecing operation, wherein the thread is placed on the ring of fibres before said spinning rotor reaches said operating speed, and wherein a quantity of fibres are fed at a rate which is smaller than the feed rate of fibres fed during normal operation until said thread is placed on said ring of fibres.
Claim 2
Independent Claim
173 words
A method for piecing a thread on open-end spinning units, in which a thread is returned to a spinning rotor, placed on a ring of fibres deposited in said spinning rotor, and then drawn off again, in which said ring of fibres is formed from fibres removed from an opened sliver, with said sliver being offered to opening means by feed means in the form of a fibre tuft; further comprising: shortening of a fibre tuft to form predetermined short fibres with said feed means switched off, switching said feed means on for producing a ring of shortened fibres in said spinning rotor, wherein the spinning rotor runs up from its stopped condition to its operating speed during the piecing operation, wherein the thread is placed on the ring of fibres before said spinning rotor reaches said operating speed, and wherein a quantity of fibres are fed at a rate which is smaller than the feed rate of fibres fed during normal operation until said thread is placed on said ring of fibres.
Claim 3
Independent Claim
124 words
A method for piecing a thread on an open-end spinning unit of the type having a spinning rotor, comprising: preparing shortened fibres, supplying said shortened fibres to said spinning rotor to form a ring of shortened fibres, returning a thread end to said ring of shortened fibres while rotating said spinning rotor to piece said thread end with said ring of shortened fibres, drawing off said thread, and supplying normal length fibres to said spinning rotor to form more thread following the piecing connection formed with said shortened ring of fibres, wherein said preparing and supplying of said shortened fibres are performed in a predetermined manner to form a predetermined configuration of said ring of shortened fibres, whereby uniform repetitive piecing operations are accommodated.
Claim 4
Independent Claim
124 words
A method for piecing a thread on an open-end spinning unit of the type having a spinning rotor, comprising: preparing shortened fibres, supplying said shortened fibres to said spinning rotor to form a ring of shortened fibres, returning a thread end to said ring of shortened fibres while rotating said spinning rotor to piece said thread end with said ring of shortened fibres, drawing off said thread, and supplying normal length fibres to said spinning rotor to form more thread following the piecing connection formed with said shortened ring of fibres, wherein said preparing and supplying of said shortened fibres are performed in a predetermined manner to form a predetermined configuration of said ring of shortened fibres, whereby uniform repetitive piecing operations are accommodated.
Claim 5
Independent Claim
100 words
A method for piecing a thread on an open-end spinning unit of the type having a spinning rotor, comprising: shortening fibres of a fibre tuft being supplied by feeding means, performing a first stage switching of said feeding means to feed the shortened fibres to said spinning rotor as a starting ring of shortened fibres for piecing with a thread end to be returned to the spinning rotor, and performing a second stage switching of said feeding means to feed fibres of normal length which are longer than said shortened fibres to said spinning rotor after said first stage switching.
Claim 6
Independent Claim
100 words
A method for piecing a thread on an open-end spinning unit of the type having a spinning rotor, comprising: shortening fibres of a fibre tuft being supplied by feeding means, performing a first stage switching of said feeding means to feed the shortened fibres to said spinning rotor as a starting ring of shortened fibres for piecing with a thread end to be returned to the spinning rotor, and performing a second stage switching of said feeding means to feed fibres of normal length which are longer than said shortened fibres to said spinning rotor after said first stage switching.
Claim 7
Dependent Claim
61 words
A method according to claim 3, wherein said shortening of fibres is done with said feeding means in a stopped condition and includes holding of said fibre tuft at said feeding means while an opening means arranged downstream of said feeding means and upstream of said spinning rotor continuously operates to shorten fibres of said fibre tuft in a predetermined manner.
Claim 8
Dependent Claim
58 words
A method according to claim 3, wherein said first stage switching includes driving said feeding means with an auxiliary drive unit, and wherein said second stage switching includes driving said feeding means with a main drive unit at said spinning unit, said main drive unit being separate from and independently operable with respect to said auxiliary drive unit.
Claim 9
Dependent Claim
58 words
A method according to claim 4, wherein said first stage switching includes driving said feeding means with an auxiliary drive unit, and wherein said second stage switching includes driving said feeding means with a main drive unit at said spinning unit, said main drive unit being separate from and independently operable with respect to said auxiliary drive unit.
Claim 10
Dependent Claim
28 words
A method according to claim 3, wherein said shortening of fibres includes applying compressed air to blow said fibre tuft against an opener roller of said spinning unit.
Claim 11
Dependent Claim
28 words
A method according to claim 4, wherein said shortening of fibres includes applying compressed air to blow said fibre tuft against an opener roller of said spinning unit.
Claim 12
Dependent Claim
28 words
A method according to claim 6, wherein said shortening of fibres includes applying compressed air to blow said fibre tuft against an opener roller of said spinning unit.
Claim 13
Dependent Claim
34 words
A method according to claim 3, wherein said shortening of fibres includes applying compressed air to blow said fibre tuft against a blade at the housing for the opener roll of said spinning unit.
Claim 14
Dependent Claim
34 words
A method according to claim 6, wherein said shortening of fibres includes applying compressed air to blow said fibre tuft against a blade at the housing for the opener roll of said spinning unit.
Claim 15
Dependent Claim
34 words
A method according to claim 8, wherein said shortening of fibres includes applying compressed air to blow said fibre tuft against a blade at the housing for the opener roll of said spinning unit.
Claim 16
Dependent Claim
52 words
A method according to claim 4, wherein a thread end is returned to said spinning rotor to piece up with said ring of shortened fibres, and wherein said performing of said first stage switching is done at a predetermined time preliminary to said return of a thread end to said spinning rotor.
Claim 17
Dependent Claim
49 words
A method according to claim 5, wherein a thread end is returned to said spinning rotor to piece up with said ring of shortened fibres, and wherein said first stage switching is performed at a predetermined time preliminary to said return of a thread end to said spinning rotor.
Claim 18
Dependent Claim
19 words
A method according to claim 3, wherein said piecing is performed after a thread breakage at said spinning unit.
Claim 19
Dependent Claim
19 words
A method according to claim 6, wherein said piecing is performed after a thread breakage at said spinning unit.
Claim 20
Dependent Claim
46 words
The method according to claim 13, in which the spinning rotor runs up from its stopped condition to its operating speed during the piecing operation, and in which the thread is placed on the ring of shortened fibres before said spinning rotor reaches said operating speed.
Claim 21
Dependent Claim
46 words
The method according to claim 14, in which the spinning rotor runs up from its stopped condition to its operating speed during the piecing operation, and in which the thread is placed on the ring of shortened fibres before said spinning rotor reaches said operating speed.
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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |