Parison screening in a glassware forming machine

Details Parison screening in a glassware forming machine Parison screening in a glassware forming machine

1982-09-30

1985-05-21

Smith, William

Glass manufacturing

Plural distinct glassworking apparatus

Spaced preform reheating means with reshaping means

65267, 65355, C03B 938

Patent

active

045184127

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention is concerned with a glassware forming machine having three stations, namely a blank station at which a parison is formed from a gob of molten glass, an intermediate station at which the parison is allowed to reheat, and a blow station at which the parison is formed into an article of glassware.


BACKGROUND ART

A glassware forming machine of the so-called "Individual Section" type normally has a blank station at which a parison is formed from a gob of molten glass and a blow station at which the parison is formed into an article of glassware. The parison formed at the blank station is transferred to the blow station to be blown. It has long been recognised that it is desirable to allow the parison to reheat before being moulded at the blow station. This reheating serves to allow portions of the parison which where in contact with a mould at the blank station and have therefore become chilled to be reheated by other parts of the parison transferring heat thereto. In a more recently proposed type of individual section machine, see U.K. Patent Specification No. 1599801, a reheating intermediate station is provided between the blank station and the blow station so that parisons can be allowed to reheat at the intermediate station without causing delay in the operation of the blow station. However, it has been found that parisons at the intermediate station are subject to being chilled by up drafts of cold air created by the cold air displacing air heated by the parison. The provision of a fixed screen beneath the parison to prevent such up drafts is not practical because of the possibility that the parisons may need to be dropped from the intermediate station in the event of a malfunction of the machine.


DISCLOSURE OF INVENTION

According to the invention the glassware forming machine comprises a patter plate movable between an operative position in which it screens the underside of the parison from upraughts and an inoperative position in which the patter plate is not beneath the parison, and moving means operable to move the patter plate between its operative and inoperative positions at appropriate times in the cycle of operation of the machine.
For convenience, the patter plate is pivotally movable between its operative and inoperative positions and is moved to its operative position by the action of a pneumatic piston and cylinder device and is moved to its inoperative position by the action of a spring.
Where the machine is operative to form more than one article of glassware at a time, in order to prevent adjacent parisons at the intermediate station from heating one another, the machine also comprises a shroud assembly at the intermediate station, the shroud assembly being movable between an open position and a closed position in which the shroud assembly co-operates with stationary structure of the machine to substantially surround a parison at the intermediate station.
In order to prevent the shroud assembly from becoming overheated and itself heating the parisons, the shroud assembly is provided with internal passages through which cooling water is passed.
In order to allow for parisons of different lengths, the operative position of the patter plate is vertically adjustable.


BRIEF DESCRIPTION OF DRAWINGS

In the accompanying drawings:
FIG. 1 is a diagrammatic side view of the machine;
FIG. 2 is a fragmentary part sectional plan view, on an enlarged scale, taken on the line II--II in FIG. 1;
FIG. 3 is a sectional view taken on the line III--III in FIG. 2 but with certain parts omitted; and
FIG. 4 is a view similar to FIG. 3 but showing the machine in a different operative position.


BEST MODE OF CARRYING OUT THE INVENTION

The glassware forming machine shown in FIG. 1 is a triple gob three station machine of the individual section type. Gobs of molten glass are fed to three blank moulds at a blank station A where the gobs are formed into parisons. The parisons are formed in an inverted position by pressing or blowing in a conventional manner. A transfer and inve

REFERENCES:
patent: 1331772 (1920-02-01), Kadow
patent: 1499523 (1924-07-01), Hall
patent: 1800191 (1931-04-01), Lorenz
patent: 2702444 (1949-07-01), Rowe

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