US3722198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for spinning yarns of staple fibers and filaments
Assignee: Individual
•
Filing: 1971-10-05
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Granted: 1973-03-27
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Expires: 1991-10-05
Abstract
Abstract In a pneumatic spinning apparatus, loose fiber ends are spread laterally from a sliver of staple fibers before the sliver is twisted with a sliver of continuous filaments into a yarn in a tube by a helical air stream. The loose fiber ends form a surface layer of the yarn which is deposited last and is therefore less tightly through than the core predominantly consisting of the continuous filaments and the remainder of the staple fibers. When the twisting air and the tightly spun yarn pass into a chamber of much greater cross section, the twisting action of the air on the yarn is relaxed, and the yarn untwists until the twist in the surface layer or shell is reversed to balance the reduced twist in the core. Backward propagation of the twist toward the intake end of the apparatus is prevented by a brake consisting of a screw whose flights bound a helical guide duct. The slivers move thorugthe duct in frictional engagement with the stem of the screw and start twisting as they approach the end of the duct near the twisting zone.
Inventors
- 👤 K Gotzfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:05
CPC Classifications
D; D01; D01H; D01H1/00; D01H1/11; D01H1/115
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
222 words
A method of spinning a yarn from a first elongated sliver of staple fibers and a second elongated sliver of continuous filaments which comprises: a. passing said fibers and said filaments sequentially through an intake zone, a braking zone, a twisting zone, and a relaxing zone; b. moving said slivers in said intake zone longitudinally in transversely offset relationship; c. laterally spreading loose ends of said staple fibers from the remainder of said first sliver during passage through said intake zone; d. generating a helical air stream in said twisting zone about said slivers at a velocity sufficient to twist said slivers until a yarn having a tightly twisted core portion predominantly constituted by said filaments and said remainder and a less tightly twisted shell portion predominantly constituted by said loose ends is formed; e. braking said slivers in said braking zone and thereby preventing propagation of said twisting into said intake zone; f. relaxing the twisting action of said air stream on said yarn in said relaxing zone until said core portion partly untwists, the twist in said shell portion is reversed, and the reversed twist in said shell portion balances the remaining twist in said core portion; and g. discharging from said relaxing zone the yarn having balancing opposite twists in said core portion and in said shell portion thereof.
Claim 2
Independent Claim
222 words
A method of spinning a yarn from a first elongated sliver of staple fibers and a second elongated sliver of continuous filaments which comprises: a. passing said fibers and said filaments sequentially through an intake zone, a braking zone, a twisting zone, and a relaxing zone; b. moving said slivers in said intake zone longitudinally in transversely offset relationship; c. laterally spreading loose ends of said staple fibers from the remainder of said first sliver during passage through said intake zone; d. generating a helical air stream in said twisting zone about said slivers at a velocity sufficient to twist said slivers until a yarn having a tightly twisted core portion predominantly constituted by said filaments and said remainder and a less tightly twisted shell portion predominantly constituted by said loose ends is formed; e. braking said slivers in said braking zone and thereby preventing propagation of said twisting into said intake zone; f. relaxing the twisting action of said air stream on said yarn in said relaxing zone until said core portion partly untwists, the twist in said shell portion is reversed, and the reversed twist in said shell portion balances the remaining twist in said core portion; and g. discharging from said relaxing zone the yarn having balancing opposite twists in said core portion and in said shell portion thereof.
Claim 3
Dependent Claim
39 words
A method as set forth in claim 1, wherein said slivers are moved in said braking zone in frictional engagement with a helical wall, and are twisted while in contact with said wall as they approach said twisting zone.
Claim 4
Dependent Claim
19 words
a second section defining a twisting portion of said channel, i. said twisting portion being of circular cross section,
Claim 5
Dependent Claim
19 words
a second section defining a twisting portion of said channel, i. said twisting portion being of circular cross section,
Claim 6
Dependent Claim
17 words
Pneumatic spinning apparatus comprising: a. a plurality of sequentially communicating tubular sections jointly defining an elongated channel,
Claim 7
Dependent Claim
17 words
Pneumatic spinning apparatus comprising: a. a plurality of sequentially communicating tubular sections jointly defining an elongated channel,
Claim 8
Dependent Claim
142 words
a third section defining therein a chamber portion of said channel having a cross section much greater than the cross section of said twisting portion; b. means for generating an air stream in said slot, said air stream having a first component longitudinal of said channel and a second component longitudinal of said cross section; c. means for generating a helical air stream in said twisting portion having an axial component toward said third section; d. means for conveying fibers sequentially through the portions of said channel in said first, second, and third sections, whereby a twist is imparted to said fibers in said twisting portion by said helical air stream; and e. brake means interposed between said first and second sections for preventing twist imparted to said fibers in said twisting portion from being propagated to said fibers in said slot.
Claim 9
Dependent Claim
142 words
a third section defining therein a chamber portion of said channel having a cross section much greater than the cross section of said twisting portion; b. means for generating an air stream in said slot, said air stream having a first component longitudinal of said channel and a second component longitudinal of said cross section; c. means for generating a helical air stream in said twisting portion having an axial component toward said third section; d. means for conveying fibers sequentially through the portions of said channel in said first, second, and third sections, whereby a twist is imparted to said fibers in said twisting portion by said helical air stream; and e. brake means interposed between said first and second sections for preventing twist imparted to said fibers in said twisting portion from being propagated to said fibers in said slot.
Claim 10
Dependent Claim
44 words
Apparatus as set forth in claim 3, wherein said brake means include a screw member having an axis, an axial stem portion, and a helical flight portion about said axis, and means for holding the conveyed fibers in frictional engagement with said stem portion.
Claim 11
Dependent Claim
15 words
Apparatus as set forth in claim 4, wherein said axis extends longitudinally of said channel.
Claim 12
Dependent Claim
30 words
Apparatus as set forth in claim 4, wherein said flight portion bounds a helical guide duct about said axis, an axial end of said duct directly communicating with said slot.
Claim 13
Dependent Claim
60 words
Apparatus as set forth in claim 6, wherein an additional one of said sections connects said brake means and said second section, said additional section defining a passage portion of said channel directly communicating with said guide duct and said twisting portion, the cross section of said passage portion being substantially smaller than the cross section of said twisting portion.
Claim 14
Dependent Claim
55 words
Apparatus as set forth in claim 3, wherein said means for generating a helical air stream includes nozzle means for directing an air jet under pressure into said twisting zone in a direction obliquely inclined relative To the direction of elongation of said channel and substantially tangential to the cross section of said twisting portion.
Claim 15
Dependent Claim
21 words
Apparatus as set forth in claim 3, wherein said chamber portion has two terminal parts tapering outward of said chamber portion.
Claim 16
Dependent Claim
25 words
Apparatus as set forth in claim 3, wherein said slot tapers inwardly of said channel in the direction of elongation of said cross section thereof.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |