Overedge stitching machine

Claim 1

A SEWING MACHINE OF THE OVEREDGE STITCHING TYPE COMPRISING, MEANS TO SEW WORK TOGETHER COMPRISING, MEANS TO SEW A THREE-THREAD OVEREDGE STITCH ALONG AN EDGE OF SAID WORK, AND MEANS TO SIMULTANEOUSLY SEW A TWOTHREAD CHAIN STITCH ON SAID WORK SPACED FROM SAID OVEREDGE STITCH AND PARALLEL THEREWITH COMPRISING, A NEEDLE BAR RECIPROCABLY DRIVEN, TWO NEEDLES ON SAID BAR, A PLURALITY OF LOOPERS COOPERATIVELY ACTUATED IN TIMED RELATIONSHIP WITH EACH OTHER AND THE RECIPROCABLY TRAVEL OF SAID NEEDLES FOR EFFECTING SAID TWO STITCHES SIMULTANEOUSLY, MEANS FOR ACTUATING SAID NEEDLE BAR, MEANS FOR ACTUATING SAID LOOPERS IN TIMED RELATIONSHIP RELATIVE TO EACH OTHER AND SAID NEEDLES, SAID PLURALITY OF LOOPERS COMPRISING ONE LOOPER ACTUATED TO COOPERATE WITH ONE OF SAID NEEDLES TO SEW SAID CHAIN STITCH DURING ADVANCEMENT OF SAID WORK AND OTHER LOOPERS ACTUATED TO COOPERATE JOINTLY WITH ANOTHER OF SAID NEEDLES TO SEW SAID OVEREDGE STITCH, A GIVEN ONE OF SAID OTHER LOOPERS ACTUATED TO COOPERATE WITH THE REMAINDER OF SAID OTHER LOOPERS TO FORM SAID OVEREDGE STITCH, SAID MEANS FOR ACTUATING SAID LOOPERS IN TIMED RELATIONSHIP RELATIVE TO EACH OTHER COMPRISING A PIVOTALLY MOUNTED ARM CARRYING SAID ONE LOOPER, ANOTHER PIVOTALLY MOUNTED ARM CARRYING SAID GIVEN LOOPER OF SAID OTHER LOOPERS, A CONNECTING ROD PIVOTALLY CONNECTED BETWEEN SAID ARMS FOR ACTUATING ONE OF SAID ARMS FROM THE OTHER OF SAID ARMS AND IN TIMED RELATIONSHIP THEREWITH ALONG A PREDETERMINED PATH, MEANS TO VARY THE ANGULAR POSITION OF THE FIRSTMENTIONED ARM TO CAUSE SAID ONE LOOPER TO OPERATE SYNCHRONOUSLY WITH SAID ONE NEEDLE COMPRISING TWO PINS ECCENTRICALLY MOUNTED RELATIVE TO THE PIVOTAL AXIS OF SAID ANOTHER ARM, MEANS MOUNTING ONE OF SAID PINS EXTENDING PARALLEL WITH THE PIVOTAL AXIS OF SAID ANOTHER ARM, THE OTHER PIN BEING DISPOSED PIVOTALLY CONNECTING SAID CONNECTING ROD TO SAID ANOTHER ARM, AND MEANS FOR VARYING THE ECCENTRIC POSITION OF SAID PINS RELATIVE TO SAID PIVOTAL AXIS OF SAID ANOTHER ARM.