Heat-sealing device for bags in motion

Claim 1

IN A DEVICE FOR HEAT-SEALING BAGS OF THERMOPLASTIC MATERIAL, A MOVING ENDLESS CONVEYOR FOR SUPPORTING THE MAIN BODY PORTION OF EACH BAG, TWO PAIRS OF LOWER AND UPPER BELTS MOVING IN UNISON WITH SAID CONVEYOR, THE BELTS OF EACH PAIR LOCATED IN THE SAME PLANE, SAID PAIRS OF BELTS ENGAGING THE UNSEALED END PORTION OF EACH BAG BETWEEN THEIR OPPOSED FACES, SAID PARIS OF BELTS SPACED A SLIGHT DISTANCE APART, A JET-DISCHARGING NOZZLE, MEANS FOR DELIVERING HOT GAS UNDER PRESSURE TO SAID NOZZLE, SAID NOZZLE SO ARRANGED AS TO DELIVER A NARROW, ELONGATED JET DOWN THROUGH THE SPACING IN BETWEEN SAID PAIRS OF BELTS AND ONTO THE END PORTION OF EACH BAG AS THE END PORTION IS MOVED ALONG BENEATH SAID NOZZLE AND THEREBY PRODUCE A SEALING LINE ACROSS SUCH END PORTION, THE PAIR OF BELTS SPACED THE FURTHEREST FROM SAID CONVEYOR SO MOUNTED AND GUIDED AS TO TURN DOWNWARDLY TOGETHER FOR A SHORT DISTANCE AWAY FROM THE OTHER PAIR OF BELTS UPON PASSING SAID NOZZLE, WHEREBY THE TIP END PORTION OF EACH BAG HELD BETWEEN SAID DOWNWARDLY TURNING PAIR OF BELTS WILL BE SERVED FROM THE REMAINING PORTION OF THE BAG END SIMULTANEOUSLY WITH THE FORMING OF THE HEAT SEAL LINE BY THE NOZZLE JET, SAID DOWNWARDLY TURNING PAIR OF BELTS SO MOUNTED AND GUIDED AS TO SEPARATE AND MOVE IN OPPOSITE DIRECTIONS AFTER TURNING DOWNWARDLY FOR A SHORT DISTANCE, AND MEANS FOR COLLECTING THE SEVERED TIPS OF THE BAGS FROM SAID LAST MENTIONED PAIR OF BELTS.