Sewing machine including work folding means

Claim 1

THE COMBINATION WITH A SEWING MACHINE HAVING A RECIPROCATING NEEDLE AND A LOOP TAKER COOPERATING THEREWITH TO FORM STITCHES IN A WORK PIECE BEING OPERATED ON, OF A STITCHING PLATE BETWEEN SAID NEEDLE AND LOOP TAKER HAVING A LATERAL RECESS IN THE DIRECTION OF THE WORK FEEDING MOVEMENT, SAID NEEDLE PASSING THROUGH SAID RECESS DURING OPERATION, A WORK PRESSER FOOT HAVING A BASE OVERLYING SAID PLATE AND A DEPENDING LATERAL EXTENSION FORMING A GUIDE OVERLYING THE LATERAL FACE OF SAID PLATE AHEAD OF SAID RECESS AS VIEWED IN THE WORK FEEDING DIRECTION, FOR INTRODUCING A WORK PIECE WITH ITS PARTLY FOLDED EDGE THROUGH THE ANGULAR PASSAGEWAY FORMED BY SAID PLATE AND BASE, WORK FEEDING MEANS SYNCHRONIZED WITH AND DISPOSED BEHIND SAID NEEDLE IN RESPECT TO THE WORK FEEDING DIRECTION AND ADAPTED FOR OPERATION INTO FEEDING ENGAGEMENT WITH THE WORK WITHIN SAID RECESS, AND OSCILLATING WORK FOLDING MEANS ALSO SYNCHRONIZED WITH AND DISPOSED AHEAD OF AND CLOSE TO SAID NEEDLE, TO INTERMITTENTLY ENGAGE AND COMPLETELY REVERSELY BEND, IN COOPERATION WITH SAID PLATE, THE PARTLY FOLDED EDGE OF THE WORK WITHIN SAID RECESS IMMEDIATELY PRIOR TO THE STITCHING THEREOF BY SAID NEEDLE.