Patent GB-516467-A (GB)
Title: Improvements in or relating to glass shaping machines
IPC: C03B9/195
Filed: 1938-06-30
Abstract: 516,467. Making glass bottles or like containers. MITCHELL, W. B. June 30, 1938, No. 8987. [Class 56] Relates to a bottle-making machine of the press-and-blow type in which a number of mould units rotate continuously about a central column. According to the invention, a charge of glass continues to move in a circular path of constant radius from the time it enters a parison mould until it has been blown to shape in a finishing mould. Specification 281,383 is referred to. Each of the mould units is mounted on a plate B', Figs. 1 and 2, attached to a table B which rotates continuously about a column C to which cams b<1>-e<1> for operating the moulds etc. are secured. A mould unit comprises a pressing device, a parison mould 3, a ring mould 4, a finishing mould 6, and a funnel 5 for guiding charges of glass from a feeder into the parison mould. The pressing device comprises a relatively heavy head 7 attached to a hollow shaft 7m, Fig. 3, which is journalled in a vertical bearing 7 on the plate B<1>. The shaft 7m, and therefore the head 7, is raised by a lever 17a operated by a cam 7b adjustably secured to the machine frame. A lug 17c in the shaft engages in a vertical slot 17d in a fixed guide 17e. The pressing-plunger 7c slides vertically in the head 7 and at its upper end is connected to a lever 7h pivoted on the head. The other end of the lever is connected to a sleeve 7k<1> which slides on a rod 7k housed in the shaft 7m and surrounded by a spring 7d. In operation, the head 7 descends by gravity until it is arrested by a stop x' so that the initial pressure on the glass in the mould 3 is due to gravity. Continued pressure on the glass is exerted by the spring 7d through the lever 7h, and the pressure can be adjusted by (1) varying the compression of the spring by means of a nut 7n on the shaft 7k, and (2) by moving the pivot 7f of the lever 7h to alternative openings f<1>, f<2> in the head 7. A ring plate 7y, pressed downwards by springs 7w, is also carried by the head. When the head is raised by the cam 7b to lift the plunger out of the mould, the head is turned by a spring to swing the plunger to one side and the lug 17c moves into an horizontal extension of the slot 17d to support the weight of the head. To bring the plunger into the pressing-position above the mould 3, the head. is turned by a cam 171, Figs. 1 and 6, and a slide 17h which engages a lug 17f on the shaft 7m. The cam 17l is pivoted at 17y, and a spring 17m allows the cam to yield, if necessary, to prevent damage to the machine. A movable stop is provided to enable the head to be kept out of the pressing-position when desired, the cam 17l yielding when the stop is in use. The cam 17l and the cam 7b are both adjustable on the frame of the machine to allow the incidence and duration of the pressing period to be adjusted. The feeding-funnel 5 is carried by an arm which is swung horizontally to bring the funnel to and from the parison mould. The parison mould is composed of two hinged sections which are opened and closed by a cam-operated slide and are locked in the closed position by a bifurcated member 20, Fig. 1, which engages lugs on the carrier of the mould halves. The ring mould 4 also consists of two halves which are locked in the closed position by a yoke 4e connected to a slide 4d and provided with rollers which engage cam surfaces on the arms of the mould carriers. The finishing mould 6 consists of hinged halves which are opened and closed and locked by toggle levers operated by a pneumatic cylinder 6e. The mould is carried by a pivoted arm 65 which is swung horizontally by a. cam-operated rack 16b to move the mould to and from the parison. The parison is blown to shape in the finishing mould by air supplied by a blow head 50 carried by the supports of the mould. When blowing is completed, the mould swings outward and discharges the finished article.