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US 4,727,716 AGranted
Dual nip open-end friction spinning
AssigneeSchubert & Salzer
InventorWerner Billner
Life of this patent
Estimating the term…
Abstract
To improve integration of fibers into a yarn end and thereby improve yarn quality, fibers are directed to a feeding nip defined on an opposite side of a pair of friction rollers forming a spinning nip. The fibers are directed out of the feeding nip, passed between the friction rollers, and forwarded into the spinning nip. One of the friction rollers may constitute a conveying roller which exerts greater force upon the fibers than the other roller to securely convey fibers through a gap between the rollers and into the spinning nip.
Claims47
An open-end friction spinning apparatus, comprising:
- friction roller means, comprising a pair of friction rollers being rotatable in the same direction, and disposed adjacent one another so as to define a relatively small gap therebetween, and defining a spinning nip on one side of said gap adapted for spinning opened fibers directed thereto into yarn, and further defining a feeding nip on the other side of said gap;
- fiber feeding channel means for feeding opened fibers to the proximity of said friction roller means into said feeding nip thereof;
- and
- conveying means for directing to said spinning nip said opened fibers fed by said channel means, whereby said fibers are stretched and held tightly for being spum into fibers, wherein said conveying means includes means for providing the friction roller rotating out of said feeding nip and into said spinning nip with a greater fiber slaving force than the other friction roller so as to carry said fibers from said feeding nip to said spinning nip through said gap between said friction rollers.
1 more element
An open-end friction spinning apparatus, comprising:
- friction roller means for defining a spinning nip adapted for spinning opened fibers directed thereto into yarn;
- fiber feeding channel means for feeding opened fibers to the proximity of said friction roller means;
- and
- conveying means for directing to said spinning nip said opened fibers fed by said channel means, whereby said fibers are stretched and held tightly for being spun into fibers;
- wherein
- said friction roller means comprises a pair of friction rollers being rotatable in the same direction, and disposed adjacent one another so as to define a relatively small gap therebetween, with said spinning nip formed on one side of said gap, and feeding nip formed on the other side of said gap;
- said channel means feeds said fibers to said feeding nip;
- said conveying means directs said fibers from said feeding nip to said spinning nip through said gap defined between said friction rollers;
- said channel means is disposed at a given angle .alpha. relative a defined yarn draw-off direction of said apparatus, whereby said fibers are fed to said spinning nip in an optimal position;
- said angle .alpha. preferably falls in a range of 40.degree. to 60.degree.;
- and further wherein
- one of said friction rollers is embodied as a suction roller with perforations formed in the periphery thereof, rows of said perforations being aligned in said angle .alpha. to maintain the feeding direction of fibers through fiber feeding channel means.
9 more elements
An open-end friction spinning apparatus, comprising:
- friction roller means for defining a spinning nip adapted for spinning opened fibers directed thereto into yarn;
- fiber feeding channel means for feeding opened fibers to the proximity of said friction roller means;
- and
- conveying means for directing to said spinning nip said opened fibers fed by said channel means, whereby said fibers are stretched and held tightly for being spun into fibers;
- wherein
- said friction roller means comprises a pair of friction rollers being rotatable in the same direction, and disposed adjacent one another so as to define a relatively small gap therebetween, with said spinning nip formed on one side of said gap, and a feeding nip formed on the other side of said gap;
- said channel means feeds said fibers to said feeding nip;
- said conveying means directs said fibers from said feeding nip to said spinning nip through said gap defined between said friction rollers;
- both of said friction rollers are embodied as suction rollers with perforations in the periphery thereof, and a suction insert with longitudinally suction slit received therein with suction applied thereto during spinning operations;
- the rotational axes of said suction rollers define a plane;
- and further wherein
- the middle of the suction slit of one of said suction rollers is substantially disposed on one side of said plane, and the middle of the suction slit of the other of said suction rollers is disposed substantially on an opposite side of said plane from said one side thereof.
9 more elements
A device for performing open-end friction spinning, including:
- two rotatable friction rollers in close proximity to each other with a gap therebetween, and drivable in the same direction;
- a fiber feeding channel for supplying fiber material to said rollers;
- and
- two nips formed on opposing sides of said gap, one of said nips constituting a spinning nip in which fiber material directed thereto is spun into yarn, and the other of said nips constituting a feeding nip which receives fiber material from said fiber feeding channel;
- wherein one of said friction rollers rotates away from said feeding nip and into said spinning nip and has a greater fiber slaving force than the other roller so as to form a conveying roller for directing fiber material from said feeding nip to said spinning nip through said gap, whereby said fiber material is stretched as it is directed through said gap.
2 more elements
An apparatus for open-end friction spinning, including:
- two friction rollers in close proximity to each other and driven in the same direction;
- and
- two nips formed on opposite sides of said rollers, one of said nips constituting a spinning nip, and the other of said nips constituting a feeding nip;
- wherein
- one of said friction rollers rotates out of said feeding nip into said spinning nip, and is provided with a closed casing having a surface of greater roughness than the casing surface of the other friction roller, which other roller rotates out of said spinning nip into said feeding nip, and which is embodied as a suction roller.
2 more elements
A process for performing open-end friction spinning in which fibers are twisted together into a yarn in a spinning nip formed by two friction rollers in close proximity of each other and driven in the same direction, such yarn being subsequently drawn off from the spinning nip in the direction of the rotational axes of the friction rollers, said process including:
- initially feeding fibers to a feeding nip formed on an opposite side of the friction rollers from the spinning nip formed thereby;
- and
- then feeding fibers from the feeding nip, between the two friction rollers, and into the spinning nip, whereby the fibers are desirably stretched for being spun into yarn;
- wherein one of the friction rollers is embodied so as to exert greater slaving force upon fibers than the other friction roller, thereby permitting fibers to be directed between the rollers into the spinning nip.
1 more element
A method of performing open-end friction spinning such that fibers are stretched and held tightly while being spun into yarn, said method comprising the steps of:
- providing two rotatable friction rollers in close proximity to each other with a gap therebetween and driven in the same direction, a plane being defined by the rotational axes of said rollers and passing through the smallest point of said gap, and a spinning nip in which fibers are spun into yarn being formed by said rollers adjacent said gap on one side of said plane;
- feeding fibers to a feeding nip formed by said rollers adjacent said gap on a side of said plane opposite said spinning nip;
- and
- conveying said fibers from said feeding nip to said spinning nip through said gap, by one of said friction rollers provided with a greater slaving force, wherein said fibers are stretched as they pass through said gap and held tightly for being spun into yarn in said spinning nip.
1 more element
An open-end friction spinning apparatus, comprising:
- friction roller means for defining a spinning nip adapted for spinning opened fibers directed thereto into yarn;
- fiber feeding channel means for feeding opened fibers to the proximity of said friction roller means;
- and
- conveying means for directing to said spinning nip said opened fibers fed by said channel means, whereby said fibers are stretched and held tightly for being spun into fibers;
- wherein
- said friction roller means comprises two friction rollers mounted with their rotational axes substantially in parallel, with one of said rollers comprising a suction roller having perforations in the periphery thereof, and a suction insert with a longitudinal suction slit included therein, said two friction rollers being displaced from one another such that a gap defined therebetween decreases in a defined yarn draw-off direction of said apparatus, whereby frictional contact between yarn being produced and said friction rollers is desirably increased.
3 more elements
Dependencies are inferred from the claim text.