Patent GB-426467-A (GB)
Title: Improvements in or relating to glass shaping machines
IPC: C03B9/22
Filed: 1934-08-23
Abstract: 426,467. Glass manufacture. PARFITT, A. W., Stafford House, Norfolk Street, Strand, London.-(Europaisher Verband der Flaschenfabriken Ges. ; 20, Breitestrasse, Dusseldorf, Germany) Aug. 23, 1934, No. 24259. [Class 56] Relates to a glass-shaping machine of the double-table, suction-gathering type in which the mould tables rotate continuously but in which means are provided for enabling mould units to remain stationary while a parison is being transferred from a parison mould to a finishing mould. According to the invention, the mould units receive an accelerated movement as they approach the transfer position and are swung backwards while transfer is taking place, the speed of the backward movement being such that the moulds remain stationary in space. The machine comprises two mould tables 15, 16, Fig. 2, rotated in unison with one another by a driving shaft 84, differential gears 85, 86 being interposed in the drive to enable the moulds on the two tables to be brought into accurate alignment with one another. The table 15 rotates on a hollow vertical column 19, and the parison mould units are carried by rings 24, Figs. 2 and 3, which rotate independently of one another on the column 19. Each of the mould units is supported by an horizontal arm 20 which is connected by an horizontal pivot 23 with a ring 24, so that the arms and the moulds are movable in a vertical plane. A vertical post 26, depending from the arm 20, carries a roller which engages a fixed cam 28, and this cam is so shaped that it lifts the parison moulds 21 over the edge of a forehearth 25 containing molten glass, and dips the mould in the glass to enable a charge to be gathered by suction. Each parison mould 21 is pivoted to the arm 20 and is opened and closed by slides operated by a fixed cam 38. The ring moulds 22 are closed by a spring and are opened at the transfer position by a pneumatic cylinder 46 carried by the arm 20. Each of the arms 20 also carries a suction head 61 and a pneumatic cylinder for moving a neck-forming pin into and out of the ring mould. The finishing moulds 97, Fig. 2, are similarly mounted on radial arms 98 on the table 16. The moulds are opened and closed by a fixed cam, but a pneumatic cylinder 102 is provided to close the finishing mould on the suspended parison at the transfer position. A blowhead is carried by each of the arms 98, and it is swung down on to the mould when a parison has been taken from the ring mould at the transfer position. In use, a parison mould is dipped into the molten glass in the forehearth 25 and gathers a charge by suction, the glass trailing from the mould being cut off, as the mould is lifted, by a stationary knife secured to the rim of the forehearth. Each of the mould arms 20 and 98 is accelerated as it approaches the transfer position, remains at rest at the point while a parison is being transferred and until it regains its normal position relative to the mould table. For this purpose, vertical rocking-shafts 133 are journalled in plates 51 which form part of the mould tables. An arm 134 secured to each shaft is oscillated by a fixed cam 136, while another arm 137, also secured to the shaft 133, has a sliding connection with a mould arm 20 or 98. The cam tracks 136 are suitably shaped to give the required movement to the mould arms, the independent mounting of tho rings 24 on the stationary columns permitting the mould arms to move relatively to one another.