Surveillance and control of the yarn input tension on circular weft knitting machines : new approaches

摘要

The Yarn Input Tension - YIT is one of themost important parameters in weft knitting industry. This parameter must be maintained between limits in order to produce knitted fabric without faults. However, YIT is not the only parameter to control and monitor forpreventing faults. The knitting elements and the knitting machine itself should be monitored to improve productivity and quality. The monitoring of the YIT can be used to detect the faults and at the same time controlled inside tight limits to prevent machine’spremature stop due to yarn break .This paper will present the recent developments made for monitoring and control the YIT. A surveillance system will be presented, a low cost force sensor will besuggested to substitute the present industrial solutions, and a new actuator for control of the YIT will be introduced.