Device to detect the belt tension of weft inserting members in shuttleless looms

摘要

A device to detect the tension uniformity of a belt in a weft inserting member of a shuttleless loom wherein a belt anchored at its ends to fixed contiguous points and guided by rollers on a movable carriage with reciprocating motion serves to to control a gripper for laying down weft threads. The device comprises a cylindrical anchoring body on which an end of the belt is partly wound, there being interposed between the anchoring body and the belt section an elastic member mounted on the anchoring body and urged by the belt section against the body by the tension in the belt. Upon slackening of the belt, the elastic member displaces the belt section to produce closure of a switch which detects the reduction in the belt tension.