Looper drive for chain stitch sewing machines

Claim 1

IN A CHAIN STITCH SEWING MACHING HAVING A MACHINE ARM, A BASE PLATE AND ADJUSTABLE BOTTOM AND NEEDLE FEED MEANS OF THE TYPE IN WHICH THE LOOPER EFFECTS LONGITUDINAL THREAD SEIZING AND DROPPING MOVEMENTS AND LATERAL NEEDLE DEFLECTING MOVEMENTS DERIVED FROM ECCENTRICS, A LOOPER DRIVE MECHANISM INCLUDING SYNCHRONIZING MEANS AND SETTING MEANS FOR IMPARTING ADJUSTABLE MOVEMENTS TO THE LOOPER TO SYNCHRONIZE THE LOOPER WITHE THE NEEDLE, SAID SYNCHRONIZING MEANS COMPRISING AN ARM SHAFT JOURNALLED IN SAID MACHINE ARM, A NEEDLE BAR SUPPORTING A NEEDLE DISPOSED ENDWISE OF SAID ARM SHAFT, A ROCKER FOR GUIDING SAID NEEDLE BAR, A ROCKING SHAFT, MEANS OPERATIVELY LINKING SAID ROCKING SHAFT TO SAID ARM SHAFT AND TO SAID ROCKER, A LOOPER DRIVE SHAFT DISPOSED BELOW THE BASE PLATE, MEANS OPERATIVELY CONNECTING SAID LOOPER DRIVE SHAFT TO SAID ARM SHAFT, A LOOPER SHAFT, A LOOPER CONNECTED TO SAID LOOPER SHAFT AND DISPOSED BELOW SAID NEEDLE AND LINKAGE MEANS INCLUDING A FIRST ADJUSTABLE ECCENTRIC MOUNTED ON SAID LOOPER DRIVE SHAFT FOR EFFECTING LONGITUDINAL THREAD SEIZING AND DROPPING MOVEMENTS, SAID FIRST ECCENTRIC LINKING SAID LOOPER SHAFT TO SAID LOOPER DRIVE SHAFT AND SECOND ECCENTRIC MOUNTED ON SAID LOOPER DRIVE SHAFT, AND A OPERATIVELY ASSOCIATED WITH SAID LOOPER SHAFT FOR CONTROLLING DEFLECTING MOVEMENTS OF SAID LOOPER, AND SAID SETTING MEANS INCLUDING ADJUSTABLE MEANS MOUNTED CONCENTRICALLY WITH SAID LOOPER DRIVE SHAFT, SAID ADJUSTABLE MEANS BEING OPERATIVELY INTERCONNECTED WITH THE FIRST ADJUSTABLE ECCENTRIC OPERATIVE TO CHANGE THE ANGULAR POSITION OF SAID FIRST ECCENTRIC FOR COORDINATING THE LONGITUDINAL MOVEMENTS AND THE DEFLECTING MOVEMENT OF SAID LOOPER TO ESTABLISH COINCIDENCE OF LOOPER MOVEMENTS WITH RESPECT TO THE ADJUSTABLE NEEDLE FEED MEANS FOR DIFFERENT STITCH LENGTHS.