Rotary type injection blow molding machine

Details Rotary type injection blow molding machine Rotary type injection blow molding machine

1988-07-05

1989-07-11

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Female mold and means to shape parison directly by internal...

264538, 425534, B29C 4906

Patent

active

048466611

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE ART

This invention relates to a rotary type injection blow molding machine which can continuously carry out, by use of an intermittently rotating transfer plate, the step required to release a molded article blow molded from injection molding of a preform.


BACKGROUND OF THE INVENTION

A molding machine for continuously carrying out the operation from injection molding of a preform to blow molding of a molded article such as a bottle has already been well known from Japanese Patent Publication No. 53-22096.
In a mold device for molding a preform in the aforesaid well known molding machine, an upper base plate upwardly of a machine bed is disposed relative to a lower neck mold, and a cavity mold is moved upward and downward to open and close the mold. Therefore, a nozzle of the injection apparatus has to be disengaged when the mold is opened, which tends to extend the injection molding cycle. A stringiness and a leakage occur in the nozzle depending on the resins.
In view of the above, an attempt has been made so that the cavity mold is fixed onto the machine bed, and conversely the neck mold is moved upward and downward. In this case, however, the neck mold has to be moved upward and downward together with the transfer plate, and therefore, there poses new problems that not only the apparatus becomes complicated in relation to other operating stations but it requires time to rotate the transfer plate immediately after mold-opening to transfer a preform along with the neck mold to the succeeding operating station.
As the means for solving the above-described problems, development has been made of a mold device for molding a preform in which a retaining mold also serving as a molding mold in the outer periphery of an open portion of a preform is moved upward and downward, without moving upward and downward the cavity mold and the transfer plate, to open and close the mold. However, in this apparatus, as disclosed in Japanese Patent Application Laid-Open No. 62-128708, a vertical shaft for supporting the retaining mold upward and downward is mounted downwardly lengthwise on the lower surface of the transfer plate, and therefore, when the blow mold is opened in a horizontal direction and the retaining mold is horizontally moved by the rotation of the transfer plate, the vertical shaft touches the blow mold to render the rotation of the transfer plate difficult. For this reason, it was necessary to make a design so that the blow mold having been installed on the machine bed is moved upward and downward conversely to the cavity mold.


DISCLOSURE OF THE INVENTION

It is an object of this invention to provide a newly designed rotary type injection blow molding machine wherein while a lip mold is mounted on a vertical shaft and vertically movably mounted to the lower surface of the transfer plate, not only a mold for molding a preform but a blow molding need not be installed movably upward and downward on a lower base plate on the machine bed, and even if these molds are at a fixed position of the lower base plate, the vertical shaft comprises no obstacle of the rotation of the transfer plate.
The above-described object is solved by this invention which provides a rotary type injection blow molding machine in which a lower base plate and an upper base plate are disposed up and down parallel to each other on a machine bed, a work space being formed between both the base plates, an annular transfer plate is provided on the underside of said upper base plate, the transfer plate and an intermittently rotating driving device installed in the central portion of the upper base plate are connected by engagement between a rack provided internally of the transfer plate and a pinion on the side of the driving device, lip retainer plates also serving as retaining molds are provided free to open and close at regular intervals on the lower side of the transfer plate while facing to said work space, stop positions of the lip retainer plates being set to operating portions from injection molding of a preform to mol

REFERENCES:
patent: 4426202 (1984-01-01), Krishnakumar et al.
patent: 4457689 (1984-07-01), Aoki
patent: 4505664 (1985-03-01), Craig
patent: 4648824 (1987-03-01), Aoki
patent: 4726756 (1988-02-01), Aoki
patent: 4731011 (1988-03-01), Nakamura et al.
patent: 4732557 (1988-03-01), Aoki
patent: 4747769 (1988-05-01), Nakamura et al.

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