Weft thread brake responsive to yarn characteristics in a loom
US5476122A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1994 |
| Grant date | Dec 19, 1995 |
| Priority date | — |
| Expiry date | Jul 8, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2701/31
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A weft thread brake for a loom has brake force application members controlled by a drive such as a high resolution stepping motor or a continuously adjustable drive for reducing or increasing a gap between the brake force application members. The weft thread moves through this gap. A thread tension sensor is arranged downstream of the brake and produces an actual thread tension signal that is used for producing in a closed loop unit, a brake force control signal for controlling the brake force in dependence on the actual thread tension signal. A rated weft thread tension value may be compared in the control unit with the measured actual weft thread tension signal and the result of this comparison is then used to produce the control signal to adapt the brake force to the thread characteristics and to maintain at all times during a weft thread insertion the required weft thread tension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.