Patent GB-281383-A (GB)
Title: Improvements in or relating to glass shaping machines
IPC: C03B9/195
Filed: 1926-08-31
Abstract: 281,383. Moorshead, T. C. Aug. 31, 1926. Blowing ; pressing.-In a machine of the press- and-blow type for making glassware, each blank mould receives a gob or charge of molten glasswhile it is in continuous movement past a feeder- and the charged mould is then moved inwards into co-operation with a ring mould. After a charge has been pressed to form a parison, the blank mould opens and is moved outwards again, leaving the parison suspended from the ring mould until it is enclosed by the finishing mould and blown. Specification 165,875 is referred to. The machine comprises a hollow stationary column carried by a wheeled base 1. a revolving frame 4 being mounted on the lower part, 2, of the column while the upper part carries upper and lower fixed cam rings 5, 6, respectively. A track 10 is fixed to and encircles the base 1, and this track raises and lowers the finishing-moulds 11 the carriers of which are pivoted to the revolving frame 4. The blank moulds 17, which always remain upright, are arranged in a circle outside the periphery of the machine, but each can be swung inwards. Each mould consists of two halves pivoted on a shaft 22 mounted on a swing- ing arm 32 which, in turn. is pivoted on a vertical shaft 33 on the revolving frame 4. The arm is connected by a rod 32<c> with a cam lever 32a which is operated by a track 32<b> on the fixed cam ring 6, and the movements of the lever 32<a> thus swing the moulds inwards or outwards. The mould is opened and closed by links 24, a lever 26, a connecting rod and a cam lever operated by a track on the fixed cam ring G. In its outer position, a mould passes beneath a feeder 18 and receives a charge of glass. A guiding-cup 36, one of which is fixed to the frame of the machine above the outer position of each mould, guides the charge into the mould. As soon as the charge enters, suction is applied to the lower part of the mould, through ports 38. 39, to compact the glass. Aftercharging the mould is swung inwards and registers with a ring mould 34 and plunger 35. The ring mould is made in halves and is opened and closed by a cam-operated slide 47. The plunger 35 is secured to a rod 64 which slides within a crosshead 65 and is normally forced downwards by a spring 67 which allows the plunger to yield if it meets with undue resistance. The crosshead 65 is moved up and down by a sector 71 operated by a slide 76. A registering head 50 is provided with a bushing 61 which is embraced by the ring mould and serves to guide the plunger 35 in its downward movement. The head 50 is also provided with pins 62 which register with recesses on the blank and finishing moulds. Devices are also provided for locking the blank moulds to prevent them from being opened by the pressure of the plunger during the pressing operation. After the plunger has risen, the blank mould is opened and swung outwards again and leaves the parison suspended from the ring mould. A finishing mould is then raised by the track 10 and closes about the parison. The mould is opened and closed by a slide operated by a track 95 on the lower cam ring. Finally, the parison is blown by air supplied through a blowhead 101 which slides over the ring mould. Air for cooling the moulds is supplied from the central column 2 through ports 15, 16 to an air chamber in the rotating frame 4.