Patent GB-666396-A (GB)
Title: Improvements in and relating to apparatus for the manufacture of blown glass articles
IPC: C03B9/29
Filed: 1947-12-15
Abstract: 666,396. Making hollow glassware. WALLE, C. VAN DE., WALLE, E. VAN DE., and BONNEFOY, E. Dec. 15, 1947 [Jan. 9, 1940], No. 32966/47. Addition to 508,784. Class 56. A glass-blowing machine, according to the parent Specification, in which a charge of plastic glass is delivered to each table of a rotatable series, the tables each having an aperture which is obturated whilst the plastic glass is pressed to thin it over the table so that, when the obturator is removed, the glass sags through the aperture to permit a blowing-head to blow the glass into a split rotary mould which is appropriately brought into position, is provided with improvements in the means for obturating and thinning, rotating the moulds, cooling the tables and moulds, positioning the parts relatively to one another and removing the finished workpiece. As shown, the table 51 is pivoted on an axis 81 so that when it is raised by a cam 84, the part of the workpiece 85 projecting above the table is removed by a circular cutter 53, the workpiece being thus freed to fall over the discharge shoot 87. The empty table is then restored to horizontal position preparatory to receiving a charge of plastic glass which is fed by a curved shoot through an opening in the side of a cup 110 which is concentric with the aperture in the table and locates the glass accordingly. The obturator 58 is presented to the aperture by pneumatic pressure in a cylinder 88, the pneumatic control being effected by a slide valve 91, the slide rod 90 of which is operated by a bell crank 60, 60a and a stop 98. The obturator 58 and its actuating-means are mounted on an arm 12 carried by a ring 11 revoluble on the central vertical column of the machine, the arm being supported at its free end by a roller 73 and being normally pulled by a counterweight 103 so that it rests against the buffer 97. The bell crank 60, 60a carries a cam roller 63 at its free end which is provided with a pawl 61, the cam 64, which rotates with the assembly of tables, having recesses 65 (one for each table) which allow the pawl 61 to rise into action, under force of the air pressure in the cylinder 91, and clutch the arm 12 temporarily to the rotating assembly of tables, the obturator 58 being thus placed in alignment with the aperture in the table. The movement of the valve rod 90 admits compressed air to the cylinder 88 and applies the obturator to the aperture. Air is simultaneously admitted through the branch pipe 92a to the cylinder 94, also carried by the arm 12, so that the thinning- plate 68 presses the glass on to the obturator. The degree of thinning is determined by a screw adjustment 71<SP>1</SP>. The piston rod 57 of the obturator, thinning-plate and the arm 12 is effected justable stop 59a which engages an extension of the bell crank 60, 60a. The disengagement of the pawl and the consequent return of the obturator, thinning-plate and the arm 12 is effected by the fixed adjustable stop 98 which engages the valve rod 90. The cup 110 is carried by pistons 111, the cylinders of which are supplied with compressed air through a pipe 114 through a suitable valve, so that the cup is applied to, and removed from, the table at appropriate times. The blow heads 41 are mounted on arms 8, as in the parent case, to rise and fall, and swing, under cam and spring action, on vertical spindles 7 carried on the rotary assembly, the. heads 41 being thus presented to the apertured plate for the blow, or moved away therefrom as necessary. The correct positioning of the blow heads during the spring-return swing of the arms is effected by a revolubly adjustable eccentric stop 107 which contacts with a stop 106 on each of the arms. The moulds are opened and closed on their hinges 25, are each mounted on a tilting support 10 and are periodically inverted as described in the parent Specification, but the rotation of the moulds is effected by the frictional engagement of the pulleys 26 with endless belts 82 which are trained in the correct part by loose pulleys and are driven by a fast pulley. The moulds are, during the period of inversion, traversed through a cooling bath 99. The tables are cooled by water flowing through passages 115 from a circular rotary trough 100 and pipes 101. The water is discharged over a shelf 51a and through the space between the walls 5, 5a of the central rotating column.