Plastic article or earthenware shaping or treating: apparatus – Female mold and means to shape parison directly by internal... – With heating or cooling means
Patent
1989-03-16
1990-08-07
Hoag, Willard
Plastic article or earthenware shaping or treating: apparatus
Female mold and means to shape parison directly by internal...
With heating or cooling means
425533, 425534, B29C 4906, B29C 4936, B29C 4964
Patent
active
049463675
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a rotary type molding machine which can be utilized for continuous molding of a preform or in situations where molding of a preform followed by orientation blow molding of a hollow molded product are continuously carried out.
BACKGROUND OF ART
A rotary molding machine of the type described herein includes one configuration which has a construction in which a base plate is secured upwardly relative to a machine bed, and an injection molding device which is movable up and down with respect to a transfer plate provided intermittently and rotatably on the underside of the base plate. The injection molding device is movable up and down to effect a clamping action. The other configuration has a construction in which an injection molding device is secured on one side thereof to one side of a machine bed, a base plate side is disposed movably up and down in opposed relation thereto, and a rotary plate is movable down together with the base plate to effect clamping.
The first machine configuration in which the base plate and the transfer plate are fixed has problems that since the injection mold device is moved up and down an every injection molding of a preform, an injection nozzle needs to be separated every time and therefore starting of measurement of resins material is delayed; and drooling or wire-drawing occurs every time the injection nozzle is separated, to a degree which depends on the type of resin. As a result, marginal portions of the injection nozzle or mold gate become stained and in addition a sprue gate is damaged by the resins adhered to the injection nozzle.
The second machine configuration, in which the base plate side is moved up and down, has been developed in order to solve such problems. However, this molding machine involves the problem that the transfer plate, the driving device therefor and various other devices required for molding are also moved up and down together with the base plate. Therefore, the weight which has to be moved vertically is large and as the molding machine becomes large in size, the vertical moving speed is restricted, making it difficult to open and close the lip mold at high speed. Particularly, when the vertically-moving stroke increases, the downwardly moving speed is accelerated so that the lip mold collides with the mold, thus requiring a buffer means. An improved injection orientation blow molding machine for hollow molded products, e.g. bottles, which are longitudinally long has been needed for some time.
SUMMARY OF THE INVENTION
This invention has been made in view of the above-described circumstances and problems. An object of the present invention is to provide a new rotary type molding machine in which an injection mold is secured to a machine bed side so that an injection device may be always placed in nozzle contact position to effect molding, the vertically-movable weight reduced, and a vertically-moving speed not accelerated due to a load. In accordance with the present invention, even if the verticall-moving stroke is large, opening and closing of a lip mold at a high speed can be carried out smoothly.
Another object of this invention is to provide a new rotary type molding machine in which both vertically-moving cylinder and driving device are positioned in the center of rotation of a moving plate, making it difficult to cause an unbalanced load, an eccentricity or like conditions. Also despite the use of the machine for long periods of time, the transfer plate is not inclined to impair rotation and a deviation in mold opening and closing will not occur.
For achieving the aforesaid objects, the present invention provides a rotary type molding machine in which lip molds, which also serve as holders for a preform and a hollow molded product are provided on at least four portions in the underside of the rotatable element. A circular transfer plate having a member receiving hole is provided on the surface on the lip molds above a machine bed supporting a central portion of a plate body by a rotary shaft.
REFERENCES:
patent: 3146287 (1964-08-01), Kleine-Albers
patent: 3806294 (1974-04-01), Hehl
patent: 3889849 (1975-06-01), Chandler
patent: 3941534 (1976-03-01), Hunkar
patent: 4105391 (1978-08-01), Aoki
patent: 4726756 (1988-02-01), Aoki
patent: 4744742 (1986-08-01), Aoki
Hoag Willard
Nissei ASB Machine Co. Ltd.
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