Method and apparatus for detwisting cloth

US4329838A · kind A · utility

Assignee

• Erhardt & Leimer GmbH · DE

Inventors

• Ludwig Zerle · Bogen, DE
• Heinz Schmidt · Steinfeld (Oldenburg), DE

Key dates

• Filing date: Mar 26, 1980
• Grant date: May 18, 1982
• Expiry date: Mar 26, 2000

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D06B23/08
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

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.