Patent GB-382444-A (GB)
Title: Improvements in and relating to glassware forming machines
IPC: C03B9/22
Filed: 1931-11-24
Abstract: 382,444. Blowing glassware. EVANS, 0., 27, Chancery Lane, London.-(Hagemeyer, E. ; 24, Franklinstrasse, D³sseldorf, Germany.) Nov. 24, 1931, No. 32592. [Class 56.] A suction-gathering machine in which the parison and finishing moulds are carried by separate intermittently-rotated tables is characterized by the fact that suction of the glass into the parison moulds takes place while the moulds are moving, and that transfer of the blanks from the parison moulds to the finishing moulds takes place while the moulds are at rest. The mechanism for reciprocating the neck-forming plungers is also utilized for moving the parison moulds into and out of position for gathering charges of glass. The machine is shown in plan in Fig. 1 and in sectional elevation in Fig. 2. It comprises a wheeled base 20 carrying vertical hollow standards 25, 132 about which the parison mould table 30 and the finishing mould table 135, respectively, rotate. The standards support cams for operating the moulds &c., and a distributer head 27, for supplying air pressure to a number of pneumatic cylinders and blowheads, is mounted in the top of the standard 25. The tables 30, 135 are hollow and form pressure chambers 33, 134, respectively, from which air pressure is supplied to other parts of the mechanism. The tables are rotated step by step in unison with one another by a motor 38 through gearing 39. Each of the parison mould units comprises a pair of spaced uprights rising from the table 30, and an horizontal arm 47, secured to one of the uprights, is formed at its outer end with a vertical bearing 48 for the plunger sleeve 19. A slide 50, movable in vertical guides carried by the uprights, carries a vertical bearing 51 for the hinge pin 52 of the parison mould 17 and ring mould 18. The bearing 51 also supports rigidly a suction head 53 formed with a vacuum chamber which is connected by a pipe with a distributer valve 61 formed on the standard 25. A two-part ring mould 18 carried by arms makes contact with the underside of the suction head 53 and it is opened and closed by a pneumatic cylinder 67. The piston-rod 69 of the cylinder has a slotted end 71 to allow vertical movement of the mould arms. Air pressure is supplied to the cylinder from the pressure chamber 33 through a sleeve valve 35 which is operated by a trip secured to the base and by arms 78 secured to the finishing moulds. A two-part parison mould 17 is carried by arms hinged on the pin 52 and is opened and closed by a slide 81 operated by a fixed cam 83. The mould group, consisting of the ring and parison moulds and the suction head 53, is normally held in an elevated position by means of a counterweight 85 which is connected to the slide 50 by a lever 86. The neck-forming plunger 90 is carried by a rod 91 which extends through the sleeve 19. The sleeve is formed with rack teeth 96 which are engaged by a gear segment 97 operated by a fixed cam 101. The sleeve also carries at its upper end a pneumatic cylinder 92, the piston of which is secured to the plunger rod 91. Downward movement of the sleeve seats a blow head 95, carried by the lower end of the sleeve, on the top of the suction head 53, and continued downward movement forces the moulds downward, this movement being timed to take place when the parison mould is to be dipped to gather a charge of molten glass. The cylinder 92 advances the plunger 90 into the ring mould and withdraws it after a charge of glass has been gathered. The string of glass which trails from the bottom of the parison mould is severed by a blade 111 which also acts as a mould bottom when the plunger 90 is withdrawn and air under pressure is admitted to the head 53, through a passage in the plunger, to compact the glass in the mould. The shear blade is carried by a rod 119 extending through a tube 110 that slides through a vertical opening in the hinge pin 51. The rod 119 and the tube 110 are moved vertically by fixed cams 123 and 118, respectively, and the rod has a pin which moves in an angular slot in the tube so that the blade is moved vertically and swung under the mould. As soon as the blowhead 95 is lifted from the suction head 53, the moulds rise to their highest position and the blade 111 is swung to one side giving a quick separation of the mould and the knife. When the moulds arrive at the transferring position, the closing of the finishing mould causes the arm 78 on the mould to operate a sleeve valve 35. This opens the ring mould and leaves the parison enclosed in and supported entirely by the finishing mould. Each of the finishing moulds 138 is opened and closed by a pneumatic cylinder 145. Constant air pressure is supplied to one side of the piston of this cylinder to hold the mould halves open, and air is supplied periodically to the other side of the piston to close the mould. A bottom plate 141 is carried by an arm 142 pivoted to the table and is provided with a roller 144 that runs on a fixed cam 143. At the discharging position, when the mould is opened, the bottom is swung downwards and tilts the finished article into a trough 196. A blowhead is arranged above each of the finishing moulds. Each blowhead consists of a pneumatic cylinder 164 secured to an arm which is pivoted in a bracket 166 and is swung about an horizontal axle 181 by a gear segment 190 and a rack bar 191 operated by a fixed cam 195. The piston 167 within the cylinder 164 has a depending skirt 168 which, when blowing is taking place, engages a rib on the top of the mould and keeps it locked. When a parison has been enclosed in the mould, the blowhead is swung downwards and the skirt seats itself on top of the mould. The skirt 168 does not make contact with the mouth of the parison, and before blowing commences, time is allowed for the chilled mouth of the parison to reheat by conduction from the hotter glass. Air is then supplied to the space within the skirt 168 to blow the parison to fill the space within the mould. The piston 167 is then raised and the blowhead is swung upwards to permit the mould to open and discharge the finished article. In use, the machine gathers its charges of glass from a trough 22 extending from the front of a tank furnace 21. The machine is placed, as shown in Fig. 1, at such an angle to the front of the tank that, when the mould tables are at rest in the transferring position, one parison mould is about to enter the trough 22 while another has just left it. Thus glass is gathered while a parison mould is moving from one position of rest to another.