Glass manufacturing – Blowing means with blow mold
Patent
1982-09-30
1986-04-01
Kellogg, Arthur
Glass manufacturing
Blowing means with blow mold
65264, 65300, C03B 936
Patent
active
045795754
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention is concerned with a supporting and moving mechanism for a blow head of a glassware forming machine which is operable to blow air into glass parisons positioned in a mould cavity to cause them to expand and take up the shape of the mould cavity, the mechanism comprising a blow head support arranged to support a blow head which defines an upper portion of the mould cavity, a tube associated with the blow head support and arranged to enter a parison so that air can be blown through the tube into the parison, air supply means operable to supply air under pressure to the tube to be blown into a parison, and blow head support moving means operable to move the blow head support and blow head supported thereby between an operative position thereof in which the tube enters a parison in a mould cavity and an out-of-the-way position.
BACKGROUND ART
In many glassware forming machines, parisons of glass which have been moulded either by a blowing or by a pressing operation are placed in the mould cavity and air is blown into them to cause them to expand and take up the shape of the mould cavity. To supply the air to the parison, a blow head which closes the top of the mould cavity has a tube associated with it which is moved with the blow head and enters the parison so that air can be blown through the tube into the parison. The blow head and the tube are moved between an operative position in which the blow head closes the moulding cavity and the tube extends into the parison and an out-of-the-way position in which the glassware article can be removed from the mould cavity and a further parison introduced into the mould cavity. In many existing glassware forming machines, the movement of the blow head and the tube is achieved by a combination of vertical and rotary motion.
This combination of motions requires a complicated mechanism to ensure speed of movement and to cushion any impact between the blow head and the parison and/or the mould, cushioning of this impact being necessary to prevent damage occurring. Furthermore, the mechanism employed for cushioning this impact requires complicated adjustment when the size of the mould is to be changed.
It is an object of the present invention to provide an improved blow head supporting and moving mechanism of a glassware forming machine in which any impact between the blow head and parison is cushioned by means which does not require adjustment when the size of the mould is to be changed.
DISCLOSURE OF INVENTION
According to the invention, the blow head support moving means comprises horizontal moving means operable to move the blow head support horizontally into or out of vertical alignment with a parison, and vertical moving means operable to move the blow head support vertically into its operative position, the vertical moving means comprising a first piston and cylinder assembly operable to move the blow head support vertically, and a second piston and cylinder assembly operable, as the tube approaches the parison, to oppose the action of the first piston and cylinder assembly to thereby cushion any impact between the blow head and the parison.
In the interests of productivity, it is necessary that the blow head begins its return movement to its out-of-the-way position as soon as possible after the blowing of the article so that removal of the glassware article can take place. In order to achieve an early commencement of this return movement, it is preferred that the second piston and cylinder assembly is operative, when the blowing of the parison has been completed, to move the blow head support vertically away from the parison.
In order to enable the operative position of the blow head to be adjusted, it is preferred that the first piston and cylinder assembly has a piston rod which carries an abutment arranged to engaged the piston of the second piston and cylinder assembly as the tube approaches the parison, and the abutment is adjustable longitudinally along the piston rod.
BRIEF DESCRIPTION OF DRAWINGS
In the accompanying
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Emhart Industries Inc.
Kellogg Arthur
Moore Arthur B.
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