Method and apparatus for monitoring a predetermined yarn quality at a textile machine, especially at a friction spinning apparatus
US4819421A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1988 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Apr 25, 2008 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD01H13/32
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
To control the yarn quality of a yarn produced by a textile machine, for instance a friction spinning apparatus, there is provided at the end of the friction spinning operation, however, forwardly of the pair of withdrawal rolls for the outfeed of the produced yarn, a yarn tension measuring device. Upon deviating from or falling outside of a predeterminate yarn tension tolerance value or range the yarn tension measuring device controls operation of the friction spinning apparatus such that, as required, there is accomplished an appropriate increase or decrease of the yarn tension of the yarn produced by the friction spinning apparatus. Alteration of the yarn tension can be acheived, for instance, by acting upon the drive for one of the friction spinning elements, to control the rotational speed thereof, or by selectively positioning the suction nozzle of a friction spinning element, or by controlling the size of the nip between coacting friction spinning elements, or selected combinations of such measures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.