Tension devicess for embroidery machines

Claim 1

IN AN EMBROIDERING APPARATUS OF THE CLASS IN WHICH THERE ARE A PLURALITY OF EMBROIDERY NEEDLES OPERATIVELY MOVABLE BETWEEN OPERATIVE AND INOPERATIVE POSITIONS AND PROVIDED WITH MEANS FOR DRAWING THREADS ALONG PREDETERMINED THREAD PATHS FROM SPOOL MEANS, THREAD TENSION CONTROL MEANS INTERPOSED BETWEEN SAID NEEDLES AND SAID SPOOL MEANS, SAID CONTROL MEANS COMPRISING A PLURALITY OF PAIRS OF DISCS ARRANGED IN A ROW EXTENDING LONGITUDINALLY OF THE APPARATUS, THE TWO DISCS OF EACH PAIR HAVING COACTING GRIPPING PORTIONS POSITIONED AND PROPORTIONED TO ENGAGE THEREBETWEEN A THREAD OPERATIVELY EXTENDING FROM SAID SPOOL MEANS TO ONE OF SAID NEEDLES ALONG ONE OF SAID PATHS, SAID DISCS OF EACH PAIR BEING MOVABLE RELATIVE TO EACH OTHER BETWEEN PREDETERMINED THREAD-RELEASING AND THREAD-PRESSING LIMITING POSITION, SAID DISCS HAVING APERTURED PORTIONS IN LONGITUDINAL ALIGNMENT, A ROD DISPOSED LONGITUDINALLY WITHIN SAID APERTURED PORTIONS AND MOVABLE BETWEEN PREDETERMINED LIMITING POSITIONS, A PUSH MEMBER CARRIED BY SAID ROD AND OPERATIVELY ADJACENT TO ONE OF SAID DISCS, A STOP MEMBER IN SPACED RELATION TO SAID PUSH MEMBER AND IN OPERATIVE ENGAGEMENT WITH ANOTHER OF SAID DISCS, SPRING MEANS BETWEEN SAID PUSH AND STOP MEMBERS AND IN ENGAGEMENT WITH AT LEAST ONE OF SAID DISCS, AND ACTUATING MEANS CONNECTED TO SAID ROD FOR MOVING IT, AGAINST THE ACTION OF SAID SPRING MEANS, IN