Sewing machines

Claim 1

IN A SEWING MACHINE PROVIDED WITH A WORK FEEDING AND STITCHING MECHANISM WHICH ACTS AT A STITCHING ZONE OF THE MACHINE AND IS DRIVEN FROM A MOTOR THROUGH A DRIVING TRANSMISSION INCLUDING A CLUTCH WHICH IS COUPLED THROUGH A LINKAGE TO A FOOT-OPERATED MEANS DICTATING THE STARTING AND STOPPING OF THE SAID MECHANISM, CONTROL EQUIPMENT COMPRISING AN ELECTRO-MAGNETIC DEVICE INCORPORATED DIRECTLY IN SAID LINKAGE SO AS TO FORM PART OF THE LATTER, A PHOTO-ELECTRIC DETECTOR DEVICE ARRANGED AT SAID STITCHING ZONE TO DETECT THE PRESENCE OF WORK IN SAID STITCHING ZONE, AN ELECTRICAL CIRCUIT INCORPORATING SAID DETECTOR DEVICE AND SAID ELECTRO-MAGNETIC DEVICE, AND AN ADJUSTABLE TIME DELAY DEVICE CONNECTED INTO SAID ELECTRICAL CIRCUIT, WHEREBY, WHEN THE DETECTOR DEVICE DETECTS THE ABSENCE OF WORK IN THE STITCHING ZONE, THE ELECTRO-MAGNETIC DEVICE IS OPERATED THROUGH THE ELECTRICAL CIRCUIT AND UNDER THE ACTION OF THE TIME DELAY DEVICE SO THAT THE CLUTCH IS DISENGAGED AND THE WORK FEEDING AND STITCHING MECHANISM IS ARRESTED INDEPENDENT OF THE POSITION OF THE FOOT-OPERATED MEANS.