Patent GB-503921-A (GB)
Title: Improvements in or relating to machines for making blown glassware
IPC: C03B9/22
Filed: 1937-10-13
Abstract: 503,921. Making hollow glassware. KENT-OWENS MACHINE CO. Oct. 13, 1937, No, 27893. Convention date, Nov. 2, 1936. [Class 56] Relates to a rotary machine of the multiple mould suctiongathering type for making blown glassware. According to the invention, the. blow moulds are mounted above the parison moulds, and transfer of a parison takes place by raising it from the opened parison mould into position to be enclosed by the finishing mould which is moved radially outwards for the purpose, the closed mould then being retracted to a position below a blowhead. The machine base 34, Fig. 2, is mounted on a truck 24 that runs on rails 22. A system of levers 32, 33, pivoted at the ends of the truck and connected by a nut 30 and a screwed shaft 29, enables the machine to be raised and lowered, when the shaft 29 is rotated by a motor 42, to adjust the parison moulds to the correct level for dipping into the molten glass. The frame or turret that carries the mould units rotates about a hollow coluiiin 75 secured to the base 34, and this column is oscillated in a vertical plane, as described in Specification 31419/38, to dip the parison moulds into the molten glass at the gathering point. The rotating turret carries an upper spider 78, Fig. 1, and a lower spider 77. The parison moulds 90 are mounted on pivots 93 carried by the lower spider, and arc opened and closed by slides 96 operated by a stationary cam 98. Each finishing mould 105 is mounted on a carrier 100 which slides radially in guides 101 on the spider 77 and is moved inwards and outwards by a stationary cam 103. The mould 105 is opened and closed by a slide 112 operated by a stationary cam 115. The bottom of the finishing mould is pivoted on the slide 100 and is lowered, to discharge the finished ware, when the pivot pin 108 of the mould 105 is depressed, by a cam-operated lever 129. A discharge shoot 135 is pivoted to the spider 77, and is swung upwards by a spring between the opened halves of the parison mould, when the mould bottom is lowered, and receives the finished article. Each of the gathering heads 150 slides upon a pair of columns 79 and is raised and lowered by a link frame 153 connected to a lever 154 oscillated by a stationary cam 162. The columns 79 are hollow and serve as channels for connecting the gathering head to supplies of suction and compression. Each ring mould 167 is pivoted on the underside of a gathering head, and is opened by pins 183 which are moved laterally by a stationary cam 197. The mouth-forming mandrel or plunger 170 is moved out of and into the ring mould by a spring and by a pneumatic cylinder 177 carried by the link frame 153. Compressed air and suction for forming the ware and gathering the glass are supplied to chambers 225 and 211 respectively, in the upper part of the central column 75, the chamber 225 being connected to the mould units by channels controlled by cam-operated valves 223 and 212. The cams 231 that operate the valves 223, and another similar valve 237 for operating the mandrel cylinder 177, are made up of a series of short sections to enable the contour to be adjusted. A blowhead 240 is provided to co-operate with the finishing mould and is operated by the depression of the lever 154. In operation, when a charged parison mould is raised out of the glass, the trailing thread of glass is cut off by a blade 260 which is swung beneath the mould. The blade is lowered slightly, when the mandrel 170 is withdrawn from the ring mould, to limit the elongation of the parison when air is blown into the ring mould to form the preliminary blow opening. After the parison mould has opened, the gathering head 150 is raised and carries the parison into the path of the open finishing mould which moves outwards and closes on the parison, the previously blown article being discharged on to the shoot 135. The ring mould opens and leaves the parison in the closed finishing mould which is then moved backwards to its initial position where the blowhead 240 descends and completes the formation of the article. The ring mould may be arranged to descend as the finishing mould closes to flatten the bottom of the parison against the mould bottom to facilitate the proper formation of the article. The lower end of the column 75 is hollow, and air may be'passed through this space to the lower spider 77, which also is hollow, for cooling the moulds. The cams that operate the various devices may be adjustable about the central column by any suitable means in order to adjust the incidence and duration of the different operations.