Ganged sewing machines

Claim 1

A MACHINE FOR SIMULTANEOUSLY PERFORMING A SERIES OF SUCCESSIVE SEWING OPERATIONS ON A WORK PIECE COMPRISING A FRAME, AT LEAST A PAIR OF SEWING MACHINES MOUNTED ON SAID FRAME ONE BEHIND THE OTHER, EACH OF SAID SEWING MACHINES INCLUDING A MAIN DRIVING SHAFT, AN OPERATIVELY CONNECTED NEEDLE BAR, A MEANS OPERATIVELY CONNECTING SAID DRIVING SHAFT TO THE NEEDLE BAR, A PAIR OF PRESSURE ROLLER MEANS, A MOTOR MEANS CONNECTED IN DRIVING RELATIONSHIP TO ONE OF SAID MACHINES, MEANS CONNECTING SAID OTHER MACHINE IN TIMED DRIVING RELATIONSHIP TO SAID MOTOR DRIVEN MACHINE WHEREBY THE NEEDLES OF THE RESPECTIVE MACHINES RECIPROCATE IN UNISON, AND ENDLESS CONVEYOR HAVING SPACED FLIGHTS, ONE OF SAID FLIGHTS PASSING BENEATH THE PAIR OF PRESSURE ROLLER MEANS OF EACH SWING MACHINE, MEANS FOR INDIVIDUALLY BIASING EACH OF THE RESPECTIVE PAIR OF ROLLER MEANS RELATIVE TO SAID FLIGHT PASSING THEREBENEATH, AND MEANS FOR ADJUSTING THE BIAS ON EACH OF SAID ROLLER MEANS, SAID CONVEYOR HAVING PORTIONUS DISPOSED ON EITHER SIDE OF THE NEEDLES OF SAID SEWING MACHINES, MEANS FOR SYNCHRONIZING THE MOVEMENT OF SAID CONVEYOR PORTIONS WITH THE SEWING NEEDLE OF EACH OF SAID MACHINES, SAID SYNCHRONIZING MEANS INCLUDINMG A DRIVE ROLLER FOR DRIVING SAID CONVEYOR, UNIDIRECTIONAL DRIVE MEANS OPERATIVELY CONNECTED WITH SAID DRIVE ROLLER WHEREBY SAID CONVEYOR IS INTERMITTENTLY ADVANCED, AND MEANS OPERATIVELY CONNECTING SAID UNDIRECTIONAL DRIVE MEANS TO SAID MAIN DRIVE SHAFT OF SAID MOTOR DRIVEN MACHINE, WHEREBY SAID CONVEYOR FUNCTIONS AS A COMMON FEED DOG FOR EACH OF SAID MACHINES TO EFFECT SYNCHRONIZATION OF THE SEWING OPERATION OF THE RESPECTIVE MACHINES.