Edge guide automatic sewing

Claim 1

IN AN APPARATUS FOR SEWING AT A CONSTANT PREDETERMINED DISTANCE FROM AND ALONG THE EDGES OF AN IRREGULARLY CONTOURED PIECE OF CLOTH, A MOTOR OPERATED SEWING MACHINE HAVING A RECIPROCATING NEEDLE FOR FORMING A LINE OF STITCHING IN SAID CLOTH PIECE AND HAVING FEED DOGS FOR CAUSING INCREMENTAL FEED OF THE CLOTH PIECE IN ONE DIRECTION PAST SAID NEEDLE, AND GUIDE MEANS FOR ORIENTATING SAID CLOTH PIECE RELATIVE TO THE DIRECTION OF FEED OF SAID FEED DOGS SUCH THAT THE LINE OF STITCHING APPLIED TO THE CLOTH PIECE IN SAID DIRECTION OF FEED OF THE FEED DOGS FOLLOWS SUBSTANTIALLY THE IRREGULAR CONTOUR OF SAID CLOTH PIECE, SAID GUIDE MEANS COMPRISING A CLAMPING MEANS FOR HOLDING SAID CLOTH PIECE HORIZONTALLY AND POSITIONING SAID CLOTH PIECE IN SAID FEED DOGS, A FIRST AND SECOND CARRIAGE POSITIONED SUBSTANTIALLY PERPENDICULARLY TO EACH OTHER SUPPORTING SAID CLAMPING MEANS AND ADAPTED TO MOVE SAID CLAMPING MEANS ALONG A RESULTANT PATH IN A HORIZONTAL PLANE AS DETERMINED BY THE INDIVIDUAL MOVEMENT OF EACH CARRIAGE FOR SEWING ALONG THE RELATIVELY SMALL ANGULAR CHANGES IN DIRECTION OF THE EDGES OF SAID CLOTH PIECE, AND MEANS MOUNTING SAID CLAMPING MEANS FOR ROTATION ABOUT