Sewing machine for blind stitching binding tape

Claim 1

IN A SEWING MACHINE FOR STITCHING BINDING, COMPRISING A BASE, A STANDARD HAVING AN ARM OVERHANGING THE BASE AND PROVIDED WITH A NEEDLE HEAD CARRYING A RECIPROCABLE NEEDLE, MEANS INCLUDING A DRIVING SHAFT FOR RECIPROCATING SAID NEEDLE, A PRESSER FOOT, HAVING AN EDGE FOR GUIDING A BINDING INTO A POSITION TO BE STITCHED, A FOLDER MOUNTED ON SAID BASE FOR FOLDING A BINDING LONGITUDINALLY THEREOF WITH THE OPPOSITE EDGES TURNED INWARDLY TO FORM A TOP EDGE FOLD AND A BOTTOM EDGE FOLD EACH HAVING A PLURALITY OF PLIES, SAID FOLDER HAVING A THROAT ADJACENT THE PATH OF TRAVEL OF THE NEEDLE, THE THROAT AND PRESSER FOOT BEING SO RELATED THAT A BINDING UPON EMERGING FROM THE THROAT AND BEING FED TO THE PRESSER FOOT FOR STITCHING WILL BE ANGULARLY BENT SO THAT THE NEEDLE AT EACH RECIPROCATION THEREOF WILL PASS THROUGH THE INNER PLY OF AT LEAST ONE FOLD, THE IMPROVEMENT WHICH COMPRISES MEANS INDEPENDENT OF THE PRESSER FOOT FOR ENGAGING THE OTHER EDGE FOLD OF A BINDING AS IT ENTERS THE THROAT OF THE FOLDER FOR SELECTIVELY CONTROLLING SAID OTHER ENGAGED EDGE FOLD FOR MOVING IT INTO OR OUT OF THE PATH OF TRAVEL OF THE NEEDLE.