Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – Including means to prepare parison
Patent
1987-02-11
1988-03-15
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
Including means to prepare parison
264532, 264538, 425533, 425534, 425540, 425541, B29C 4904, B29C 4912
Patent
active
047310111
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a molding machine which can be used in the case where a preform is injection molded from a synthetic resin, and the resulting preform is immediately blow molded into a thin-wall container.
BACKGROUND OF THE INVENTION
Various constructions of machines for immediately molding an injection molded preform into a thin-wall container such as a bottle or cup have been well known. Particularly, a molding machine disclosed in U.S. Pat. No. 4,105,391, that is, a molding machine comprising a machine bed, a base plate disposed above the machine bed, a rotary disk provided on the undersurface of the base plate, and a space used for molding operation, the space being provided between the base plate and the machine bed, whereby the rotatably provided rotary disk is intermittently driven to successively feed injection molded preforms and blow molded products, is being widely used as a molding machine which can continuously carry out a series of operations of injection molding of preforms, temperature controlling and stretching and blow molding.
In the above-described well known molding machine, since the rotary disk is located on the undersurface of the base plate, support points of the base plate disposed above the machine bed are limited to the peripheral edge, and various operating portions such as injection, temperature control and blowing are provided in stop positions of neck molds provided in spaced apart relation on the undersurface of the rotary disk with a clamping device, a blowing device, etc. arranged, because of which the number of support points is limited to 3 to 4 points.
Therefore, it has not been possible to increase the diameter of the base plate and rotary disk so that the neck molds provided on the undersurface of the rotary disk and the devices provided on the base plate are made to a larger size for volume production of molded products, in terms of loads. Furthermore, tie bars of the clamping device are used to support the base plate, there poses problems such that with the trend of large size of the base plate, the supporting spacing becomes prolonged, and the foundation tends to flex.
SUMMARY OF THE INVENTION
This invention has been achieved in order to solve these problems noted above with respect to the conventional molding machine. It is an object of this invention to provide a molding machine having novel construction in which even if the support position of the base plate is at the peripheral edge, support points may be increased; tie bars of the clamping device need not be used to support the base plate; a large machine may be used for volume production; and the machine may be utilized not only for injection blow molding but for injection stretching blow molding.
For achieving the aforementioned object, the present invention is featurized in that a base plate having a circular rotary disk rotatably provided on the underside thereof is placed on the upper surface of a machine bed with the peripheral portion thereof fixed, the machine bed is interiorly provided with a molding operating space to accommodate therein a lower clamping mechanism of each clamping device provided vertically to injection and blow molding position of the base plate, and injection and blow molds are mounted on a lower clamping plate.
BRIEF DESCRIPTION OF THE DRAWINGS
The drawings illustrate an injection blow molding machine according to this invention.
FIG. 1 is a longitudinal sectional view;
FIG. 2 is a plan view with various devices on the base plate removed;
FIG. 3 is a sectional view taken on line III--III of FIG. 2; and
FIGS. 4 to 6 are partial sectional views, respectively, showing the molding steps in order.
BEST MODE FOR EMBODYING THE INVENTION
In the drawings, reference numeral 1 designates a machine bed, 2 a base plate and 3 a circular rotary disk.
The upper surface of the machine bed 1 is open leaving the peripheral edge portions, and the base plate 2 is placed on the upper surface of the machine bed. The peripheral portion of the base plate is se
REFERENCES:
patent: 4105391 (1978-08-01), Aoki
patent: 4457689 (1984-07-01), Aoki
Fujiwara Toshio
Koga Kouhei
Kosuge Satoru
Nakamura Yoshinori
Heitbrink Timothy W.
Nissei ASB Machine Co. Ltd.
Woo Jay H.
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