H schutte

Claim 1

A CONTROL SYSTEM FOR YARN CLEARING APPARATUS COMPRISING, IN COMBINATION, AN OSCILLATOR CIRCUIT COMPRISING A PAIR OF ELECTRON TUBES AND A PAIR OF FEEDBACK PATHS FOR INTERCONNECTING THE INPUT OF EACH TUBE TO THE OUTPUT OF THE OTHER TUBE, A CAPACITOR IN EACH OF SAID FEEDBACK PATHS ONE OF SAID CAPACITORS FORMING A YARN MEASURING CAPACITOR IN ONE OF SAID FEEDBACK PATHS BETWEEN THE PLATES OF WHICH SAID YARN IS ADVANCED, SAID YARN MEASURING CAPACITOR HAVING A VALUE WHICH VARIES PROPORTIONALLY WITH THE MASS OF SAID YARN, AN IMPEDANCE ASSOCIATED WITH THE OTHER FEEDBACK PATH, IMBALANCE RESPONSIVE MEANS CONNECTED TO THE OUTPUT OF BOTH OF SAID TUBES FOR PERFORMING A CONTROL FUNCTION, SAID FEEDBACK PATH IMPEDANCE BEING ARRANGED TO CHANGE SUBSTANTIALLY IN VALUE WHEN A SLUB OF PREDETERMINED MASS IS PRESENT IN SAID YARN MEASURING CAPACITOR AND TO PRODUCE AN IMBALANCE IN SAID IMBALANCE RESPONSIVE MEANS FOR PERFORMING SAID CONTROL FUNCTION, A SECOND CAPACITOR IN SAID OTHER FEEDBACK PATH, SAID IMPEDANCE COMPRISING A DISCHARGE TUBE CONNECTED IN PARALLEL RELATIONSHIP WITH SAID SECOND CAPACITOR, AND SAID DISCHARGE TUBE BEING ARRANGED TO CONDUCT AND SUBSTANTIALLY CHANGE ITS IMPEDANCE VALUE WHEN THE VALUE OF SAID YARN MEASURING CAPACITOR REACHES SAID PREDETERMINED MAGNITUDE CORRESPONDING TO A SLUB OF PREDETERMINED MASS IN SAID YARN.