Glass manufacturing – With signal – indicator – inspection means – register – or recorder
Patent
1982-09-30
1984-07-24
Kellogg, Arthur D.
Glass manufacturing
With signal, indicator, inspection means, register, or recorder
65 29, 65163, 65DIG13, 364473, 364476, C03B 940
Patent
active
044616376
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention is concerned with an individual section glassware forming machine comprising a blank station including a blank mould for forming a parison in an inverted position, and transfer means driven by a motor for transferring a parison from the blank station and presenting the parison in an upright position at another station.
BACKGROUND ART
In the manufacture of glassware by the conventional process using a conventional individual section glassware forming machine, a gob of molten glass is first formed into a parison either by pressing or blowing in a blank or parison-forming mould at a blank station of the machine. The parison is formed in an inverted position at the blank station, and is transferred directly to a shaping station where the parison is presented in an upright position ready for final shaping of the article of glassware by the application of air under pressure inside the parison in a blow mould at the shaping station. The parison is thus inverted through 180.degree. during transfer from the blank station to the shaping station.
During this transfer the parison is held by its finish in the neck rings of a pneumatically driven inverting mechanism and, as the parison is moved through 180.degree., the parison passes through a range of positions in which the gravitational and centrifugal forces are acting to bend the parison about its finish. There is, therefore, a serious risk of damage to the finish as well as to the parison itself, and it is important to control the movement of the inverting mechanism in such a way as to minimise the deformation forces which are acting upon the parison and its finish during the inverting movement.
Damage to the parison and its finish can also arise from the impact forces generated when the arm of the inverting mechanism which carries the neck rings is brought to rest at the end of the stroke of the pneumatic piston and cylinder device which the drives the inverting mechanism. These impact forces act on the parison and its finish when the parison is in a vertical position, thereby presenting a different problem of damage which is additional to that which arises during the inverting movement.
Exactly similar problems arise in a three station individual section machine in which the parison is formed in an inverted position at the blank station and is transferred with an inverted movement from the blank station to an intermediate station where the parison is presented in an upright position for reheating before subsequent transfer of the parison from the intermediate station to a shaping station, which is the third station of the machine.
DISCLOSURE OF INVENTION
In an individual section glassware forming machine according to the invention, the machine comprises generating means for generating an electrical command signal the magnitude of which varies in accordance with the desired position against time curve for the movement of a parison from the blank station to the said other station, and an electrical or hydraulic servo-mechanism operated by said electrical command signal for controlling the movement of the transfer means.
By the use of the present invention, a parison may be moved in an inverting movement in which it is accelerated from the rest position at which it was formed at the blank station and decelerated to rest at the other station in accordance with any desired acceleration against time curve (within the physical limitations of the machine) by the generation of an appropriate command signal.
The acceleration against time curve may be selected so that the gravitational and centrifugal forces acting on the parison are substantially matched throughout the portion of the rotational inverting movement during which the parison is brought from the inverted position to a horizontal position, and the parison is decelerated relatively smoothly to rest in the said other station. In this way, the risk of damage to the parison and particularly to its finish during the inverting movement may be minimised.
A machine in accordance wit
REFERENCES:
patent: 1826019 (1931-10-01), Peiler
patent: 1911119 (1933-05-01), Ingle
patent: 3445218 (1969-05-01), Trudeau
patent: 4203752 (1980-05-01), Becker et al.
patent: 4266961 (1981-05-01), Wood
patent: 4313750 (1982-02-01), Lulejian et al.
patent: 4367087 (1983-01-01), Cardenas-Franco et al.
Fenton Frank A.
Gennard Derek
Jones Stanley P.
Emhart Industries Inc.
Kellogg Arthur D.
Warzecha Gene
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