Patent GB-314508-A (GB)
Title: Improvements in or relating to automatic glass blowing machines
IPC: C03B9/16
Filed: 1928-10-10
Abstract: 314,508. Glassfabrikations-Automaten Ges. June 30, 1928, [Convention date]. Blowing.-An automatic glass blowing machine comprises means for packing each charge of glass into the parison mould by suction, and it is characterised by the fact that the packing of the glass, and its subsequent blowing to form a parison, is carried out with measured quantities of air, while the blowing of the parison in the finishing mould is effected by air from a storage tank. Construction. The machine is of the type in which ring moulds 5, 6, Fig. 1 are mounted on opposite sides of a member 4 mounted for rotation between standards 2, 3, so that rotation of the member carries the ring moulds in a vertical plane between a parison mould 8 and a finishing mould 10. Shafts 11, mounted on the standards 2, 3 are provided with lugs which pass through slots 13 in the standards and engage slides 7, 9. The halves of the parison mould and the finishing mould are mounted on the slides, so that oscillation of the shafts causes the moulds to open or close simultaneously. A compressed air motor 15 operates the shafts. The trunnions of the member 4 are journaled in the standards 2, 3 and one of them is rotated by a compressed air motor 18 secured to the standard 2, while the other is connected to a compressed air cylinder 27. The member contains a cylinder 19, Fig. 4, for applying suction to the ring mould to pack the glass, and another cylinder, 20, for applying pressure for expanding the glass. The piston 21 of the cylinder 19 is connected by a rod 23 with the piston 25 of the cylinder 27. The piston 22 of the cylinder 20 is connected by a rod 24 to the piston 26 of a cylinder 28 which forms one of the trunnions of the member 4. This cylinder is coaxial with the motor cylinder 18 and carries on its exterior the blade piston 29 of the motor. The cylinder 19 is connected by conduits 30, 31 with the ring moulds, and each conduit is controlled by a valve operated by a gear wheel 32, Fig. 1. Similarly, a gear wheel 35 controls valves in conduits between the cylinder 20 and the ring moulds. A pipe 36 is also mounted on the member 4 for supplying compressed air for the final blowing. Ring moulds.-The halves of the ring moulds 5, 6 are mounted on slides 38 provided at their outer ends with lugs 39 which are engaged by spring latches 41 on the finishing mould, so that the opening of the finishing mould also separates the halves of the ring mould and releases the finished article. The ring moulds are rotatably mounted on their slides 38, and they are rocked on their axes by two small air cylinders 98 mounted on the slides. The object of this construction is to oscillate the parison on its axis in order to keep it rigid and to assist in obtaining uniform distribution of the glass. Air supply.-Admission of compressed air to the different cylinders is controlled by valves 46 operated by cams 45 on a shaft 43 driven by a motor 44. Air is admitted to the valves from the hollow bedplate 1 which acts as a storage tank. The timing of the valves can be adjusted by altering the positions of the cams on their shafts. The valve wheels 32, 35 are operated by spring-controlled racks which are moved by the piston rods 73 of small pneumatic cylinders 72. Another cylinder 77<a> has a hollow piston rod which connects with the pipe 36 and admits compressed air for blowing the parisons in the finishing-mould. Shearing.-Shears 59 are provided for cutting- off charges of glass and they are pivoted on a pin 60 carried by one half of the parison mould. The shears are closed by a spring but are kept open by a pin 65 which engages a hole in a guide 63 fixed to the pivot 60. The pin is withdrawn at the proper time by a Bowden wire 67 connected to a lever which can be operated either by a pedal or by a compressed air cylinder. The shears are reset by a stop 70 when the mould opens. Cooling.-The moulds are cooled by air which circulates automatically or is forced through passages 77 bored through the walls of the moulds. Operation.-A closed parison mould is charged with glass which is drawn down into the mould by the suction applied by the cylinder 19, and the compacted glass is then expanded by air from the cylinder 20. The air for both of these operations is limited by the volumes of the cylinders 19, 20, so that the operations are carried out with measured quantities of air. Next, the parison mould is opened, and rotation of the member 4 carries the parison down into the finishing-mould. It can be seen that while a parison is being made in the mould 8, the preceding parison is being blown to its final shape in the mould 10.