Sewing machine needle bar step-over device

Claim 1

AN ATTACHMENT FOR MULTIPLE NEEDLE TUFTING MACHINES FOR PRODUCING A STEP-OVER STITCH COMPRISING (A) A NEEDLE BAR, MEANS FOR EFFECTING MOVEMENT OF SAID NEEDLE BAR TO PARTAKE SUCCESSIVELY OF AN ADVANCING STROKE AND A RETRACTING STROKE, (B) A DRIVE MECHANISM, (C) SAID DRIVE MECHANISM INCLUDING A SPEED REDUCING UNIT HAVING AN INPUT AND OUTPUT SHAFT, SAID INPUT SHAFT BEING ADAPTED TO BE CONNECTED IN DRIVING RELATIONSHIP TO THE MAIN DRIVE OF A SEWING MACHINE, (D) A LOBE CAM WHEEL CONNECTED TO THE SAID OUTPUT SHAFT, (E) A SLIDE BAR RECIPROCALLY MOUNTED ADJACENT SAID CAM WHEEL, (F) A PAIR OF CAM FOLLOWERS CARRIED ON SAID SLIDE BARS, SAID CAM FOLLOWERS BEING DISPOSED ON OPPOSITE SIDES OF SAID CAM WHEEL IN TRACKING POSITION THEREWITH, (G) MEANS FOR ADJUSTING THE POSITION OF SAID CAM FOLLOWERS RELATIVE TO SAID SLIDE BAR SO AS TO TRACK ON THE PERIPHERY OF SAID CAM WHEEL, (H) SAID CAM WHEEL HAVING COMPLEMENTARY LOBES DEFINED ON THE PERIPHERY THEREOF SO AS TO IMPART TO SAID SLIDE BAR POSITIVE SUCCESSIVE ADVANCE STROKES AND POSITIVE SUCCESSIVE RETRACTED STROKES, (I) AND A PIVOT ADJUSTMENT MECHANISM INTERCONNECTING SAID SLIDE BAR TO SAID NEEDLE BAR, (J) SAID PIVOT MECHANISM JOURNALED INTERMEDIATE THE (K) A PIVOT ARM PIVOTALLY JOURNALED INTERMEDIATE THE ENDS THEREOF ON SAID PIVOT, (L) A CONNECTING ROD CONNECTING SAID SLIDE BAR TO ONE END OF SAID PIVOT BAR, (M) AND A SECOND CONNECTING ROD CONNECTING THE OTHER END OF SAID PIVOT BAR TO SAID NEEDLE BAR, SAID SECOND ROD HAVING ONE END PIVOTALLY CONNECTED TO SAID NEEDLE BAR AND HAVING ITS OTHER END SWIVELLY CONNECTED TO SAID PIVOT ARM, (B) AND MEANS ON SAID PIVOT ADJUSTING MECHANISM FOR ADJUSTING THE GAUGE OF SAID ATTACHMENT.