| 摘要 |
<p>In the manufacture of glassware, gobs of molten glass are formed by gob-forming apparatus. A gob is formed by the action of vertically reciprocating plungers (20, 21) forcing the glass down through orifices (6, 7) in the floor of a trough (1) below which orifices shear blades separate the gob. The size of the gobs is regulated by the quantity of molten glass available to be forced through the orifices (6, 7) by the plungers (20, 21), which is regulated by the height the lower end of a metering tube (30) circumscribing the plungers (20, 21) is from the trough floor (1). The height of the lower end of the tube (30) may be varied by means of a screw-threaded axially-movable collar (42) engaged by a ring (44) able to be rotated about the collar (42) at a fixed height above the trough (1).</p> |
