Textiles: spinning – twisting – and twining – Apparatus and processes – Untwisting
Patent
1980-03-26
1982-05-18
Petrakes, John
Textiles: spinning, twisting, and twining
Apparatus and processes
Untwisting
8151, 57 31, D06C 306, D06C 2900, G01L 500
Patent
active
043298389
ABSTRACT:
A twisted textile web is detwisted by continuously withdrawing the web from a supply and passing the web longitudinally along a path and over a curved deflecting surface formed by a roller that deflects the web and divides the path into an upstream leg and a downstream leg that are out of alignment with each other. The deflecting surface can pivot about a pivot axis which passes through a pivot located to the upstream side of a straight line passing through the center of curvature of the deflecting surface and angularly equispaced between the legs. In a central position of the deflecting surface the two legs, the surface, and the pivot are all coplanar so that a twist in the web will pivotally deflect the surface in a direction depending on the direction of twist. The extent of pivoting is detected and the web is detwisted in the upstream leg in response to the detected pivoting of the surface. It is also possible to rotate the entire supply synchronously with the detwisting device to prevent a twist from being added to the web with the system according to this invention.
REFERENCES:
patent: 2117603 (1938-05-01), Dungler
patent: 2248962 (1941-07-01), Cook
patent: 2759324 (1956-08-01), Dean
patent: 2836012 (1958-05-01), Moorhouse et al.
patent: 3533144 (1970-10-01), Jaffe et al.
patent: 3693336 (1972-09-01), Bassani
patent: 3813862 (1974-06-01), Tsuchida
patent: 4106004 (1978-08-01), Kuroda
Schmidt Heinz
Zerle Ludwig
Erhardt & Leimer KG
Petrakes John
Ross Karl F.
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