Patent ID: 6896008

Claim:
A monitoring device for the weft thread of a weaving machine, in particular a rapier weaving machine or a projectile weaving machine, comprising: at least one mechanical insertion element having a thread clip that is movable to a release position; at least one weft thread detector for monitoring the movement of the weft thread during insertion through a weaving shed having an insertion end side and an arrival end side, said weft thread detector being, during each insertion, activated for a limited observation interval ending at least approximately with the release of the inserted weft thread by the thread clip; and an electronic sensor provided in an opening device arranged at the arrival shed end side for opening the thread clip of the insertion element by moving the thread clip into said release position, said thread clip being adapted to be moved to the release position by a collision impact between co-acting stop elements which are arranged on the insertion element and in the opening device, respectively, said electronic sensor responding either to the movement of the thread clip to the release position or to the arrival of the thread clip at the release position with a signal representing the end of the observation interval of the weft thread detector.