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US 4,051,655 AGranted
Friction false twister
AssigneeBarmag Barmer Maschinenfabrik AG
InventorsHellmut Lorenz, Heino Bunger
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AssigneeBarmag Barmer Maschinenfabrik AG
InventorsHellmut Lorenz, Heino Bunger
Estimating the term…
In combination with a friction false twist assembly including yarn supply means to feed a synthetic filamentary polymer yarn to a friction false twisting device and yarn take-up means to collect a false twist texturized yarn from the twisting device, preferably with means to heat-set the false twisted yarn being fed to the twisting device, this invention provides an improved friction false twist element comprising an axially elongated rotational body having a sleeve hub with a plurality of disc-shaped flanges formed integrally thereon at axially spaced positions, the integral hub and flanges being made of a molded, durable and rigid plastics material, e.g. a thermosetting resin, each flange carrying a circular yarn contacting ring as a rim fastened thereto and providing a wear-resistant, roughened outer circumferential surface ideally suited to the friction twisting of the yarn. In a preferred form, the twist element is made up of a thin metallic layer onto which a wear-resistant surface layer is applied. By including a metallic powder filler in the plastic rotational body, sufficient thermal conductivity can be maintained to transfer heat away from the yarn contacting surface.
In a friction false twister for the false twist texturizing of a synthetic yarn in combination with yarn supply means and yarn take-up means, said twister including a plurality of parallel shafts, which are positioned on the corners of a polygon and rotatably driven in the same direction and at the same speed, and a plurality of discs with frictional surfaces on their peripheries, said discs being carried on each shaft in axially spaced positions and being so large in diameter that the discs on each of the parallel shafts overlap in the center of said polygon, the yarn path being substantially parallel to said shafts in frictional engagement with said disc surfaces in said center of the polygon, the improvement which comprises a sleeve hub which is adapted to be mounted on each of said rotatable shafts and to extend over substantially the length of said shaft, said hub having a plurality of axially spaced seatings for carrying said discs, each of the discs being fixed to the hub by a shrink fit on said seatings.
In a friction false twister for the false twister texturizing of a synthetic yarn in combination with yarn supply means and yarn take-up means, said twister including a plurality of parallel shafts, which are positioned on the corners of a polygon and rotatably driven in the same direction and at the same speed, and a plurality of discs with frictional surfaces on their peripheries, said discs being carried on each shaft in axially spaced positions and being so large in diameter that the discs on each of the parallel shafts overlap in the center of the said polygon, the yarn path being substantially parallel to said shafts in frictional engagement with said disc surfaces in said center of the polygon, the improvement which comprises a sleeve hub which is adapted to be mounted on each of said rotatable shafts and to extend over substantially the length of said shaft, said hub having a plurality of said axially spaced annular discs mounted thereon and each of said shafts being axially expandable with means extending from the top of said shaft in axial direction to radially expand the shaft.
In a friction false twister for the false twist texturizing of a synthetic yarn in combination with yarn supply means and yarn take-up means, said twister including a plurality of parallel shafts, which are positioned on the corners of a polygon and rotatably driven in the same direction and at the same speed, and a plurality of discs with frictional surfaces on their peripheries, said discs being carried on each shaft in axially spaced positions and being so large in diameter that the discs on each of the parallel shafts overlap in the center of said polygon, the yarn path being substantially parallel to said shafts in frictional engagement with said disc surfaces in said center of the polygon, the improvement which comprises a sleeve hub which is adapted to be mounted on each of said rotatable shafts and to extend over substantially the length of said shaft;
Dependencies are inferred from the claim text.