Loom weft stop motion devices

Claim 1

A STOP MOTION DEVICE WHICH IS RESPONSIVE TO THE UNWINDING OF A THREAD FROM A SHUTTLE DURING THE PASSAGE THEREOF ALONG A SHUTTLE RACE IN A LOOM AND WHICH COMPRISES TRANSMITTER MEANS DISPOSED IN THE SHUTTLE AND CONTRACTING THE THREAD BEING UNWOUND, SAID TRANSMITTER MEANS BEING ADAPTED, UNDER THE INFLUENCE OF THE MOVEMENT OF THE THREAD, TO CHANGE A MAGNETIC FIELD, AND SENSING MEANS LOCATED ALONG THE ENTIRE SHUTTLE RACE AND ADAPTED TO DELIVER AN INDUCED ELECTRICAL SIGNAL UNDER THE ACTION OF THE CHANGING MAGNETIC FIELD, SAID TRANSMITTER MEANS COMPRISING TWO ROTATABLY MOUNTED ELEMENTS OF MAGNETIC MATERIAL ARRANGED ON EITHER SIDE OF THE THREAD TO BE UNWOUND FROM THE SHUTTLE, AT LEAST ONE OF SAID ELEMENTS BEING A PERMANENT MAGNET AND AT LEAST ONE OF SAID ELEMENTS ARE MOVABLE IN RELATION TO THE OTHER SUCH THAT THE ELEMENTS ARE ATTRACTED BY THE MAGNETIC FORCE THEREBETWEEN TO PROVIDE FOR SAID CHANGING OF THE MAGNETIC FIELD AND BRAKING OF THE THREAD DURING UNWINDING FROM THE SHUTTLE, SAID SENSING MEANS INCLUDING AN ELECTRICALLY CONDUCTIVE COIL EXTENDING ALONG THE ENTIRE LENGTH OF THE SHUTTLE RACE AND ADAPTED TO DELIVER SAID ELECTRICAL SIGNAL BY INDUCTION AS A RESULT OF THE CHANGES OF THE MAGNETIC FIELD, SAID ELECTRICAL SIGNAL BEING SUPPLIED TO AN ELECTRONIC DEVICE FOR STOPPING THE OPERATION OF THE LOOM UPON STOPPAGE OF THE PASSAGE OF THE THREAD AND RESULTING DISAPPEARANCE OF THE ELECTRICAL SIGNAL.