US3695019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming yarn
Assignee: Individual
•
Filing: 1970-06-16
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Granted: 1972-10-03
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Expires: 1990-06-16
Abstract
Abstract In a spinning operation in which two strands are fed from separate nip positions and are twisted together into a single ply at a convergence point, twist is incorporated into the single strands by cyclically varying the path lengths of the strands between the nip positions and the convergence point. Preferential spiralling of one strand about the other is prevented by ensuring that the ratio of feed of the strands to the convergence point are substantially equal.
Inventors
- 👤 James Lappage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:29
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/22; D02G3/26; D02G3/28; D02G3/288; D02G3/281
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
76 words
A method for producing a uniform yarn from at least two running strands which comprises the steps of separately feeding each strand from a feeding point to a convergence point, maintaining the rates of feeding of each strand to the convergence point substantially equal, twisting the strands together at the convergence point and at the same time causing the path length between the convergence point and the feeding points of the strands to be cyclically variEd.
Claim 2
Independent Claim
76 words
A method for producing a uniform yarn from at least two running strands which comprises the steps of separately feeding each strand from a feeding point to a convergence point, maintaining the rates of feeding of each strand to the convergence point substantially equal, twisting the strands together at the convergence point and at the same time causing the path length between the convergence point and the feeding points of the strands to be cyclically variEd.
Claim 3
Dependent Claim
41 words
A method as claimed in claim 1, wherein the feeding points of the strands are arranged so that they are symmetrical about a plane passing through the convergence point and the path lengths of each strand are varied equally and simultaneously.
Claim 4
Dependent Claim
36 words
A method as claimed in claim 2, wherein the convergence point is moved cyclically within the said plane such that the angle subtended by each strand with the plane at the convergence point is cyclically varied.
Claim 5
Dependent Claim
75 words
Apparatus for producing yarn from at least two strands comprising means to feed each strand from a feeding point to a convergence point, convergence means to converge the strands and twisting means to insert twist into the converged strands, and further comprising means for cyclically varying the path length between the convergence point and the feeding points of the strands while maintaining the rates of feed of the strands to the convergence point substantially equal.
Claim 6
Dependent Claim
75 words
Apparatus for producing yarn from at least two strands comprising means to feed each strand from a feeding point to a convergence point, convergence means to converge the strands and twisting means to insert twist into the converged strands, and further comprising means for cyclically varying the path length between the convergence point and the feeding points of the strands while maintaining the rates of feed of the strands to the convergence point substantially equal.
Claim 7
Dependent Claim
48 words
Apparatus as claimed in claim 4, wherein there is provided means for feeding at least two yarns from feeding positions disposed symmetrically about a plane passing between them, a convergence guide located in that plane, and means to vary the path lengths of the strands equally and simultaneously.
Claim 8
Dependent Claim
41 words
Apparatus as claimed in claim 5, wherein there is provided means to move the convergence guide within the plane so that the angle subtended with the plane by lines joining the feed points to the convergence point may be cyclically varied.
Claim 9
Dependent Claim
41 words
Apparatus as claimed in claim 4 further comprising a spinning frame having at least one drafting mechanism and a spinning spindle and means to draw at least two single rovings from the drafting mechanism through the convergence means to the spindle.
Claim 10
Dependent Claim
21 words
Apparatus as claimed in claim 7, wherein there are at least two drafting mechanisms and one roving is drawn from each.
Claim 11
Dependent Claim
19 words
Apparatus as claimed in claim 8, wherein each roving is delivered from the drafting mechanism at the same speed.
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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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |