Control for textile drafting mechanism

Claim 1

APPARATUS FOR DRIVING A SERIES OF SPACED PAIRS OF DRAFTING ROLLS AND CONTROLLING THE ANGULAR SPEED OF THE BACK PAIR OF ROLLS IN SAID SERIES RELATIVE TO THE FRONT PAIR OF ROLLS TO PRODUCE TEXTILE MATERIAL OF SUBSTANTIALLY UNIFORM WEIGHT PER UNIT LENGTH FROM A GROUP OF TEXTILE STRANDS IRRESPECTIVE OF THE ABSENCE OF AT LEAST ONE OF THE STRANDS IN THE GROUP, SAID APPARATUS COMPRISING A CONTINUOUSLY DRIVEN MAIN SHAFT, A FRONT SHAFT FIXED TO ONE OF THE FRONT ROLLS, FIRST AND SECOND FULLEYS FOXED OR THE MAIN SHAFT AND THE FRONT SHAFT RESPECTIVELY, AND AN ENDLESS BELT ENGAGING AND INTERCONNECTING SAID PULLERYS FOR TRANSMITTING ROTATION FROM THE MAIN SHAFT TO THE FRONT SHAFT AND THUS TO THE FRONT ROLLS AT A CONSTANT ANGULAR SPEED, A NORMALLY ACTIVE SLOW SPEED TRANSMISSION MEANS COUPLING SAID MAIN SHAFT TO SAID BACK ROLLS FOR DRIVING SAID BACK ROLLS AT A GIVEN RELATIVELY SLOW SPEED WHILE ALL THE STRANDS IN SAID GROUP ARE PASSING THROUGH SAID ROLLS, AT LEAST ONE NORMALLY INACTIVE TRANSMISSION MEANS INTERPOSED BETWEEN SAID MAIN SHAFT AND SAID BACK ROLLS AND BEING ARRANGED, WHEN ACTIVE, TO DRIVE SAID BACK ROLLS AT A PREDETERMINED FAST SPEED RELATIVE TO SAID SLOW SPEED, MEANS FOR DETECTING ONLY THE ABSENCE OF EACH OF ANY OF SAID STRANDS IN THEIR COURSE TO AT LEAST ONE OF SAID PAIRS OF ROLLS, AND MEANS OPERATIVELY CONNECTING SAID DETECTING MEANS TO SAID NORMALLY ACTIVE AND NORMALLY INACTIVE TRANSMISSION MEANS AND BEING RESPONSIVE TO THE DETECTION OF THE ABSENCE OF AT LEAST ONE OF SAID STRANDS BY SAID DETECTING MEANS FOR INACTIVATING SAID NORMALLY ACTIVE TRANSMISSION MEANS AND ACTIVATING SAID NORMALLY INACTIVE TRANSMISSION MEANS.