Patent GB-613428-A (GB)
Title: Improvement in glassware forming machine
IPC: C03B9/16
Filed: 1945-07-23
Abstract: 613,428. Making glass hollow-ware. KITSON, T. B. July 23, 1945, No. 18810. Convention date, July 21, 1944. [Class 56] [Also in Group XXX] In a machine for forming glassware, e.g. bottles, a hollow parison is formed in inverted position and is transferred to a finish mould for blowing into its final form, the transfer device comprising a suction head which engages the parison at the heavy end which is uppermost in the parison mould, and conveys it, while freely suspended by the suction head, in an arcuate path in a vertical plane to deliver it in a reverted position to the finish mould. The engagement with the heavy end of the parison minimize the effect of centrifugal force during the transfer. As shown in Fig. 3, the suction head comprises a sleeve 116 and a plug 119 having an annular space therebetween and carried by a plate 112 secured through floating connections 113 to a housing 110 pivoted to a casting 104 rotatable on a fixed shaft 101. The casting is connected by an adjustable link 136, slide 130 and connecting rod 133 to an air motor (not shown), and a slotted arm 123 locked to the housing 110 engages a roller on a fixed shaft 127, so that when the air motor pulls the connecting rod 133 to lift the casting 104 through 90 degrees, the suction head is rotated through 180 degrees from the depending position shown to an erect position beneath the blow mould 139. Suction to grip the parison is applied to the annular space in the head through a flexible conduit 105 and passages in the casting 104, housing 110 and plate 112. The turnover type machine shown has a pair of stationary divided moulds, the halves 25, 26, Fig. 4, forming the inverted parison mould (the neck ring halves 47, Fig. 3, are permanently secured thereto), and the halves 139, 140 the upright blow mould; these are opened and closed by air motors (not shown) acting respectively through connecting rods 43, 43a, slides 37, 37a, and yokes 29, 29a, spring couplings being provided between the slides and yokes. In operation, with the transfer device withdrawn to its raised position and the parison mould closed about a ring (not shown) carried by the suction and blow head 48, a charge is introduced from above and the mould top is then closed by a baffle head 99 moved vertically by an air motor 88, Fig. 4, and horizontally by a cam slot 91; a pneumatically-operated plunger within the blowhead 48 is raised into the neck ring 47 and suction is applied around the latter to compact the charge ; the plunger is withdrawn and pressure is applied through the blowhead to blow the parison. The baffle head 99 is then withdrawn and replaced by the transfer device, suction is applied to the latter, the parison mould is opened and the suction head with dependent parison is swung up into the blow mould. The blow mould then closes, the suction head forming the mould bottom and a blowhead 157 is lowered pneumatically for final blowing ; meanwhile the parison mould will have closed for reception of a fresh charge. Air relays, two of which are shown at A and. B, may be provided to supply blowing pressure to the blowhead 48, suction to the head of the transfer device, and suction through the blowhead 48 to the neck ring 47. Instead of air motors, other means such as cams may be used to operate the mould closing and transfer device mechanisms.