Patent · US Expired

Yarn false twisting method and apparatus

US4408448A · kind A · utility

3Cited by

9References

8Claims

0Family size

Assignee

Barmag Barmer Maschinenfabrik Aktiengesellschaft · DE

Inventors

Karl-Heinz Bauer · Graben-Neudorf, DE
Peter Dammann · Remscheid, DE
Hermann Kubler · Bad Münder am Deister, DE
Hellmut Lorenz · Lennep, DE

Key dates

Filing date	Jun 12, 1981
Grant date	Oct 11, 1983
Priority date	—
Expiry date	Jun 12, 2001

Classification

Technology area (CPC D)Textiles; Paper
CPC primaryD02G1/085
WIPO fieldTextile and paper machines
WIPO sectorMechanical engineering

Abstract

A method and apparatus of false twisting a yarn is disclosed which utilizes a pair of endless belts mounted in crossing relation to define a twisting zone therebetween, and a pressure applying member for locally biasing at least one of the belts toward the other at the twisting zone. The yarn is advanced along a path of travel through the twisting zone, and the acute angle formed between each belt and the yarn path of travel is adjusted so as to generally correspond to the desired twist angle of the yarn in its twisted condition. Further, the speed of each belt is adjusted so as to optimize the yarn tension conditions both preceding and following the belts. To achieve an essentially slipless operation, the pressure exerted by the biasing means is adjustably controlled so that the torque exerted by the belts exceeds the natural restoring torque of the yarn.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.