Chain stitch device for lock stitch sewing machines

Claim 1

IN A SEWING MACHINE HAVING LOCK-STITCH FORMING INSTRUMENTALITIES INCLUDING, A FRAME HAVING A WORK SUPPORT FORMED WITH A NEEDLE APERTURE, A THREAD-CARRYING EYE-POINTED NEEDLE SUPPORTED ABOVE SAID WORK SUPPORT FOR ENDWISE RECIPROCATION THROUGH SAID NEEDLE APERTURE, A CIRCULARLY MOVING LOOP-TAKER DISPOSED BELOW SAID WORK SUPPORT ON AN AXIS SUBSTANTIALLY PARALLEL TO THE PATH OF ENDWISE RECIPROCATION OF SAID NEEDLE, AND A BOBBIN SUPPORTING CASE JOURNALED IN SAID LOOP TAKER, STOP MEANS SUSTAINED ON SAID FRAME FOR CONSTRAINING SAID BOBBIN SUPPORTING CASE FROM CIRCULAR MOVEMENT WITH SAID LOOP TAKER, MEANS FOR SEWING CHAIN STITCHES USING THREAD CARRIED BY SAID NEEDLE COMPRISING A THREAD LOOP ENGAGING FINGER CARRIED BENEATH SAID WORK SUPPORT AND HAVING A FREE EXTREMITY EXTENDING IN A DIRECTION AWAY FROM THE WORK SUPPORT SUBSTANTIALLY PARALLEL TO SAID PATH OF ENDWISE NEEDLE RECIPROCATION AND ARRANGED BETWEEN THE PATH OF ENDWISE NEEDLE RECIPROCATION AND THE AXIS OF SAID LOOP TAKER, THREAD DIRECTING MEANS CARRIED ON SAID BOBBIN CASE AND COOPERATING WITH SAID THREAD LOOP ENGAGING FINGER FOR DIRECTING LOOPS OF THREAD MANIPULATED BY SAID LOOP TAKER ONTO SAID THREAD LOOP ENGAGING FINGER, A THREAD STRIPPING ELEMENT DISPOSED BETWEEN SAID THREAD LOOP ENGAGING FINGER AND THE PATH OF ENDWISE RECIPROCATION OF SAID NEEDLE, AND MEANS FOR RECIPROCATING SAID STRIPPING OF SAID NEEDLE AND TOWARD THE FREE END OF SAID THREAD LOOP ENGAGING FINGER AS SAID NEEDLE PENETRATES SAID NEEDLE APERTURE.