Patent GB-218107-A (GB)
Title: Improvements in glass-forming machines
IPC: C03B9/195
Filed: 1923-07-09
Abstract: 218,107. Haddan, R., (Empire Machine Co.). July 9, 1923. Blowing. - Relates to a machine, particularly intended for making thin hollow glassware, and of the kind described in Specification 21723/14, in which a charge of metal is pressed into a blank that is carried by an invertible " spindle " through the various operations of blowing. According to the present invention, the machine, which is intended to be fed by an automatic feeder, consist of two units rotating in opposite directions and each carrying a number of spindles, each spindle is provided with a clutch for controlling its rotation, and the first puffs of air for expanding a blank arc supplied by a pump located inside the spindle. The two units of the machine are mounted on a base 1, Fig. 1, which also carries an upper frame 3 on which part of the mechanism is mounted. Each unit comprises a column 2 on which a spider 51 rotates step by step, the spider carrying the spindles and the moulds. Forming the parison. A charge of metal from an automatic feeder is delivered by way of one of two shoots 33, Fig. 33, to a receiver 81, Fig. 34, which has been lowered into contact with the upturned end 195 of a blowing spindle. The receiver 81 is mounted on an horizontal frame 82, Figs. 12 and 34, carried by the rod 83 of a piston sliding in a cylinder 92. Another cylinder 86 is mounted alongside the cylinder 92 and the lower end of its piston rod is formed into a cup-shaped plunger 105 which slides within a central vertical aperture in the receiver 81. The cylinders are raised and lowered by the links 93, 109 connected to cam levers, and the interiors of the cylinders are connected with a compressed air supply. In operation, the cylinder 92 is lowered by its cam at the proper time to bring the receiver into contact with an upturned spindle that has come to rest at the loading station, the pressure of the receiver against the spindle being cushioned by the air pressure in the cylinder. A charge of glass now enters the receiver through a side opening 90, and the cylinder 86 is depressed by its cam and the plunger 105 presses the charge into a parison. The pressure of this plunger is also cushioned by the pressure of the air in the cylinder 86. Blowing-spindle construction. The spindle consists of a sleeve 123, Fig. 21, which is rotatably mounted in a ring having trunnions 120, 121. Figs. 21 and 33, which are mounted in bearings 119 on the spider 51. A tube 178, screwed into the sleeve 123, has an enlarged end 180 and contains a plunger 181 with a domed head 182 of the proper shape to form the internal cavity of the parison. The plunger is retracted by a spring 183 and is surrounded by the two halves of the ring mould 222 which are pivoted on the sleeve 123. The plunger is lifted hy a bell crank lever 188, Fig. 1, when the spindle is at the pressing station, and the parison is pressed on to the domed head 182 of the plunger. The sleeve 123, Fig. 21, contains a cylinder 281 of which the tubular piston rod 283 surrounds a rod 282 connected with the plunger 181. This cylinder supplies the air puffs for the preliminary expansion of the parison, the air for blowing it to its final shape being supplied through a pipe 303 from an air valve 304, Fig. 33. The piston 284, Fig. 21, is actuated by a rod 293 sliding axially in the trunnion 121 and actuating a bell-crank lever 292. Spindle operation. The spindle is rotated about its axis by means of a bevel wheel 125, formed on the sleeve 123, which gears with a bevel wheel 126 driven from the central shaft. The spindle is also inverted at the desired times by means of a gear wheel 169, fast on the trunnion 121, which is engaged by a rack reciprocated by arms 165, 166, Fig. 1, operated by a cam 163. Blowing the bulb. After the parison is pressed. the receiver is raised and the spindle is moved to the next station where the parison is reheated by a gas flame 335, Fig. 33. At the next station, a necker bar 228 presses against the neck of the parison close beneath the ring mould to reduce the diameter of the parison at this point and to localize its elongation, the spindle being in rotation during both of these operations and the parison being expanded by air puffs. At the next station, a, mould 249, Fig. 1, which has been lifted from a water trough 244, is closed about the parison which is depending from the vertical spindle. The parison is blown during the remainder of the rotation of the unit, the spindle being in constant rotation. Finally, the mould is opened and lowered into the water trough 244, and the spindle stops its rotation and raises the article which it drops into a shoot 322 when the halves of the ring mould are opened. The spindle is then turned upwards and moved to the first station where it receives a new charge of metal.