Punching machine with photoelectric means to stop work carriage and actuate punch

Claim 1

AN AUTOMATIC PUNCHING MACHINE, NOTABLY FOR IRONS AND LIKE SECTIONS, COMPRISING A PUNCHING STATION, A SECTION FEED BED AND A WORKING BED ON EITHER SIDE OF SAID PUNCHING STATION, SAID PUNCHING STATION COMPRISING A FIRST AND A SECOND PUNCHING DEVICE, A CARRIAGE MOVABLE ALONG SAID WORKING BED AND ADAPTED TO CAUSE THE SECTIONS TO TRAVEL PAST SAID PUNCHING STATION, MEANS FOR PRODUCING THE MOVEMENT OF TRANSLATION OF SAID CARRIAGE, POSITIONING STOPBLOCKS DISPOSED LONGITUDINALLY ON THE PATH OF SAID MOVABLE CARRIAGE, THE RELATIVE LONGITUDINAL SPACING OF SAID STOPBLOCKS CORRESPONDING TO THE INTERVALS BETWEEN THE HOLES TO BE PUNCHED, FIRST AND SECOND PHOTO-ELECTRIC CELL UNITS CARRIED BY SAID MOVABLE CARRIAGE AND CONSISTING EACH OF A PHOTO-CELL AND A LIGHT SOURCE, SAID STOP-BLOCKS BEING SO DISPOSED AS TO SHUT OUT THE LIGHT BEAM RECEIVED BY SAID PHOTO-CELLS OF SAID PHOTO-ELECTRIC CELL UNITS, SAID FIRST AND SECOND PHOTO-ELECTRIC CELL UNITS CONTROLLING ON THE ONE HAND, BOTH OF THEM, THE STOPPAGE OF MEANS FOR DISPLACING SAID MOVABLE CARRIAGE AND ON THE OTHER HAND, RESPECTIVELY, THE ACTUATION OF SAID FIRST AND SECOND PUNCHING DEVICES, EACH STOP-BLOCK COMPRISING AT LEAST ONE VERTICAL ARM, THAT IS, EITHER A FIRST ARM, OR A SECOND ARM, OR SIMULTANEOUSLY A FIRST ARM AND A SECOND ARM, SAID FIRST AND SECOND PHOTOELECTRIC CELL UNITS BEING SO MOUNTED AND POSITIONED ON SAID CARRIAGE THAT DURING THE CARRIAGE DISPLACEMENT THE FIRST ARM OF SAID STOP-BLOCK SHUTS OUT ONLY THE LIGHT RECEIVED BY THE FIRST PHOTO-CELL OF SAID FIRST PHOTO-ELECTRIC CELL UNIT, THEREBY CAUSING THE CARRIAGE TO STOP AND THE ACTUATION OF SAID FIRST PUNCHING DEVICE, AND THAT SAID SECOND ARM OF SAID STOP-BLOCKS SHUTS OUT ONLY THE LIGHT BEAM RECEIVED BY THE PHOTO-CELL OF SAID SECOND PHOTOELECTRIC CELL UNIT, THEREBY CAUSING SAID CARRIAGE TO STOP AND THE ACTUATION OF SAID SECOND PUNCHING DEVICE.