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US 4,056,924 AGranted
Yarn-twisting method and apparatus
OwnerJohn Umiastowskiinventor
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OwnerJohn Umiastowskiinventor
Estimating the term…
Method and apparatus for manufacturing yarn. The yarn has a flexible core at least part of which is twisted in a given direction while surface fibers are carried by the core at least at the twisted part thereof and are helically wound onto the exterior surface of the core in a direction opposite from the direction of twist thereof where the surface fibers are located. The yarn core initially has the fibers projecting laterally therefrom, and then the yarn core is false twisted while the fibers are helically wound into engagement with the exterior surface of the core when the initial twist is introduced into the same during false twisting with the helical winding of the fibers being in a direction opposite to the direction of the twist introduced into the core by false twisting thereof. The false twisting of the core is brought about by a simple rotary member which surrounds the core and is rotated with respect thereto at a speed sufficiently great to provide substantial slippage between the rotary member and the core, this rotary member having an end surface which engages the fibers and winds them helically against the exterior surface of the core during longitudinal feeding of the latter through the rotary member, with this action on the fibers resulting in the false twisting of the core.
In a yarn manufacturing method, the steps of false twisting a yarn core which has a plurality of fibers projecting laterally from the surface of said core for first introducing a twist in a given direction into the yarn core and for then releasing the yarn core so that it tends to twist upon itself in a direction opposite to said given direction, and, while said twist in said given direction is introduced into the yarn core, winding said fibers projecting laterally from said core at least partly into engagement with the surface thereof in a direction opposite to said given direction, so that the thus wound fibers form surface fibers at the surface of said core maintaining said twist in said given direction therein, tensioning said fibers while they are wound around said core, and false-twisting said core solely by the tensioning of the fibers while they are wound around said core.
In a yarn-manufacturing apparatus, feed means for feeding longitudinally along a predetermined path an elongated yarn core from the exterior surface of which a plurality of fibers project laterally, rotary tubular means surrounding said path for rotating about the latter and about a yarn core fed longitudinally therealong by said feed means, said rotary means having an upstream end surface toward which the yarn core is fed by said feed means and a downstream end surface away from which the yarn core is fed by said feed means, and said rotary tubular means having a hollow unobstructed interior throughout its length and having an inner uninterrupted surface of constant diameter, the internal constant diameter of said rotary means being small enough for said inner surface of said rotary tubular means to freely surround the yarn core with at least a slight clearance while said upstream end surface thereof is of a sufficiently small diameter to frictionally engage said fibers and wind the latter helically around and into engagement with said yarn core during longitudinal feeding thereof through said rotary means, and rotating means operatively connected to said rotary means for rotating the latter around said path and said core longitudinally fed therealong at a speed sufficiently high to provide substantial slippage between said rotary means and said core, while the latter is false twisted solely as a result of the action of said rotary means on said fibers.
Dependencies are inferred from the claim text.