Process and apparatus for controlling twist density during texturing
US3955349A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1975 |
| Grant date | May 11, 1976 |
| Priority date | — |
| Expiry date | Apr 28, 1995 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD02G1/028
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Apparatus and processes are described in which a friction twist imparter is used to twist two filaments or filament bundles while passing through a processing zone in which the filaments are textured by imparting a temporary high twist to the filaments and heat-setting the twisted filaments. Variations in twist density due to variations in the co-efficient of friction between the ply-yarn and twist imparter are controlled by separating the ply-yarn into two separate filaments or bundles of filaments at a point beyond the friction imparter and sensing variations in the position of the separation point, the wrap angle or tension, or both, of the ply-yarn leaving the friction twist imparter being adapted to such variations. The means for this particularly described are mechanical and include a spring-loaded lever projecting between the separated filaments at the separation point so as to follow changes in the position of this point. The lever actuates an irreversible worm gear to position a movable thread-guide through which the ply-yarn passes on its way from the twist-imparter to the separation point, thereby adjusting the wrap angle. The mechanism may be arranged so that the positi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.