WEFT THREAD MONITORING SYSTEM IN A CIRCULAR LOOM

摘要

PCT No. PCT/AT95/00183 Sec. 371 Date Mar. 5, 1997 Sec. 102(e) Date Mar. 5, 1997 PCT Filed Sep. 19, 1995 PCT Pub. No. WO96/12839 PCT Pub. Date May 2, 1996A device for monitoring a weft in a circular loom where the weft is drawn-off from a bobbin of the weaving shuttle rotating along a circular path formed by a circular reed. The device includes a magnetic sensor stationarily arranged in a zone of the circular path of the weaving shuttle for generating an electronic control signal to turn off the loom when there is a fault in the weft creating an operative connection between the magnetic sensor and a permanent magnet. The magnet is carried by the weaving shuttle. The device has a pivoting lever having the permanent magnet arranged thereon. The device also includes a return spring that displaces the pivoting lever as well as the permanent magnet attached thereon towards a position where the operative connection between the magnetic sensor and the permanent magnet is made. During the normal operation of the circular loom, the weft being drawn-off holds the permanent magnet against the influence of the return spring outside of the position where the operative connection is made.