Lock stitch sewing machines

Claim 1

IN A SEWING MACHINE HAVING A FRAME INCLUDING A WORK SUPPORTING BED, A STANDARD RISING FROM SAID BED, A BRACKET ARM EXTENDING FROM SAID STANDARD, AND A SEWING HEAD FORMED ON SAID BRACKET ARM OVERHANGING SAID BED, A NEEDLE CARRIED ON SAID SEWING HEAD AND A LOOP TAKER CARRIED IN SAID BED, A MAIN SHAFT JOURNALED IN SAID BRACKET ARM, OPERATIVE CONNECTIONS WITH SAID MAINSHAFT FOR RECIPROCATING SAID NEEDLE ENDWISE AND FOR IMPARTING INTERRELATED MOVEMENT TO SAID LOOK TAKER FOR THE FORMATION OF LOCK STITCHES, A WORK FEEDING MECHANISM EFFECTIVE TO TRANSPORT WORK FABRICS IN ONE DIRECTION RELATIVELY TO SAID WORK SUPPORTIN BED, MEANS DRIVEN BY SAID MAIN SHAFT FOR OPERATING SAID WORK FEEDING MECHANISM INCLUDING AN ADJUSTABLE FEED ECCENTRIC ON SAID MAINSHAFT, AND A FEED ECCENTRIC ADJUSTING PLUNGER CARRIED IN SAID BRACKET ARM ABOVE SAID STANDARD, A NEEDLE GATE SHIFTABLY SUPPORTED IN SAID SEWING HEAD FOR MOVEMENT IN A PLANE PARALLEL TO THE DIRECTION OF TRANSPORT OF WORK FABRICS BY SAID WORK FEEDING MECHANISM, A ROCK SHAFT JOURNALED IN A PARTITION BETWEEN SAID BRACKET ARM AND SAID SEWING HEAD, A DRIVE LINK AFFIXED AT ONE END TO SAID ROCK SHAFT AND SLIDABLY CONNECTED AT THE OTHER END TO SAID NEEDLE GATE, AND MECHANISM FOR JOGGING SAID NEEDLE GATE INCLUDING A BRACKET ADAPTED TO BE SECURED ON SAID BRACKET ARM ADJACENT TO SAID SEWING HEAD A STUD SHAFT JOURNALED IN SAID BRACKET, A DRIVEN GEAR AND AN ADJUSTABLE NEEDLE JOGGING ECCENTRIC CARRIED ON SAID STUD SHAFT, A DRIVE