Control device for lock stitch sewing machine

Claim 1

IN A LOCK STITCH SEWING MACHINE HAVING A THREAD CARRYING NEEDLE, A CIRCULARLY MOVABLE LOOP-TAKER, A LOOP SEIZING BEAK AND A THREAD LOOP MANIPULATING SURFACE FORMED ON SAID LOOP TAKER, ACTUATING MEANS OPERATIVELY CONNECTING SAID NEEDLE AND LOOP TAKER FOR COOPERATING MOVEMENT AS IS REQUIRED FOR THE FORMATION OF LOCK STITCHES, A BOBBIN CASE JOURNALED IN SAID LOOP TAKER, A ROTATABLE BOBBIN CONSTRAINED AGAINST AXIAL MOVEMENT RELATIVELY TO SAID BOBBIN CASE, SPRING DETENT MEANS EFFECTIVE BETWEEN SAID BOBBIN CASE AND SAID LOOP TAKER TO CONSTRAIN SAID BOBBIN CASE WITH SAID BOBBIN IN A SEWING POSITION DISPOSED COMPLETELY WITHIN THE PATH OF A THREAD LOOP BEING MANIPULATED BY SAID THREAD LOOP MANIPULATING SURFACE OF SAID LOOP TAKER, MEANS FOR SHIFTING SAID BOBBIN AXIALLY RELATIVELY TO SAID LOOP TAKER FROM SAID SEWING POSITION INTO A WINDING POSITION SPANNING THE PATH OF A THREAD LOOP BEING MANIPULATED BY SAID THREAD LOOP MANIPULATING SURFACE OF SAID LOOP TAKER COMPRISING, A BOBBIN CASE POSITIONING MEMBER, MEANS SUPPORTING SAID MEMBER FOR MOVEMENT IN SUBSTANTIALLY PERPENDICULAR PATHS ONE PATH PARALLEL TO THE AXIS OF CIRCULAR MOVEMENT OF SAID LOOP TAKER AND THE PERPEN-