Servosystem for sewing machines

Claim 1

IN A SEWING MACHINE HAVING CLAMPING MEANS FOR PRESSING A WORKPIECE AGAINST A BASE AND FURTHER HAVING START MEANS FOR INITIATING A SEWING CYCLE ON SAID WORKPIECE, THE COMBINATION THEREWITH OF A SERVO SYSTEM INCLUDING FIRST PNEUMATIC MEANS COUPLED WITH SAID CLAMPING MEANS, SECOND PNEUMATIC MEANS COUPED WITH SAID START MEANS, A SINGLE CONTROL ELEMENT COUPLED WITH BOTH SAID PNEUMATIC MEANS FOR ACTUATING SAME IN STAGGERED RELATIONSHIP, THEREBY SUCCESSIVELY OPERATING SAID CLAMPING MEANS AND SAID START MEANS, SAID PNEUMATIC MEANS EACH INCLUDING A RESPECTIVE PISTON-AND-CYLINDER ARRANGEMENT AND A RESPECTIVE VALVE MEANS CONNECTED WITH THE RESPECTIVE PISTON-AND-CYLINDER ARRANGEMENT FOR CONTROLLING SAME, SAID VALVE MEANS BEING MECHANICALLY CONNECTED WITH SAID ELEMENT FOR ACTUATING THEREBY, AND FURTHER VALVE MEANS OPERABLE BY SAID SECOND PNEUMATIC MEANS FOR BLOCKING OPERATION OF THE PISTON-AND-CYLINDER ARRANGEMENT OF SAID FIRST PNEUMATIC MEANS BY THE VALVE MEANS THEREOF.