Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Mold motion or position control
Patent
1991-01-17
1993-10-05
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Mold motion or position control
414223, 425190, 425228, 425574, 901 6, B29C 4580
Patent
active
052499472
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an injection molding machine, and more particularly, to a mold changer for automatically replacing a mold or a core thereof.
BACKGROUND ART
In an injection molding machine, a molten resin is injected into a molding cavity defined in a mold, which is formed of a pair of mold halves attached individually to a stationary platen and a movable platen, and the molten resin is set in the cavity to obtain a molded piece. Further, various molds are used to manufacture molded pieces of various shapes, and the mold is replaced when the kind of the molded pieces to be manufactured is changed. It is known that an automatic mold changer is used to facilitate this mold replacement. In order to facilitate diverse, small-quantity production, mold replacement, etc., moreover, a mold formed of a matrix and a core sometimes may be used to manufacture small-sized products such as lenses, in particular. In replacing the mold, in this case, only the core is changed in general which is removably attached to the matrix, which is fixed to the platens, and serves to define the molding cavity. Furthermore, a mold temperature controller is used to adjust the mold temperature to a required temperature fit for the properties of the resin material.
A conventional automatic mold changer comprises, for example, a truck movable between a mold yard and the injection molding machine, and a hydraulic clamp mechanism attached to the injection molding machine, and a mold transported from the mold yard to the injection molding machine by means of the truck is attached to a mold mounting section of the injection molding machine by means of the hydraulic clamp mechanism (see Published Examined Japanese Utility Model Application No. 2-2576, for example). According to this automatic mold changer, however, a wide transportation space is required between the injection molding machine and the mold yard, and the mold transportation and the mold replacement take much time. Since the temperature of the mold temporarily heated in the mold yard drops during the transportation, moreover, the mold must be heated again.
When using a mold formed of a pair of matrix halves and a pair of core halves, furthermore, each core half conventionally is fixed to its corresponding matrix half by means of bolts, or is fixedly fitted in a recess formed in the joint surface (parting face) of the matrix half, with the aid of a spacer or the like. The mold of this type is often used for diverse, small-quantity production, so that core replacement is frequently performed. Nevertheless, the core is conventionally attached to or detached from the matrix by manual operation, so that the core replacement requires much labor, thus lowering the production efficiency of the injection molding machine.
In the conventional mold temperature controller, moreover, a liquid heated to a predetermined temperature is circulated between the temperature controller and the mold by means of a hose. With every mold replacement, therefore, it is necessary to take the trouble of removing the hose from the used mold and attaching it to the mold to be used next. Since the place for the arrangement of the hose must be selected in consideration of an operator's hose attachment and detachment work, moreover, the hose sometimes hinder the operator's various operations, especially when it is removed.
Before storing the used mold or core, furthermore, the joint surface and a molding cavity defining surface of the mold or core is manually cleaned, in general. Conventionally, in this manner, the storage of the mold, which follows the mold replacement, requires manual work, so that it is difficult to automate the mold replacement.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide an injection molding machine of high production efficiency capable of automatically replacing a mold, core of the mold, or the like.
Another object of the present invention is to provide an injection molding machine capable of quickly attaching and detachi
REFERENCES:
patent: 4661053 (1987-04-01), Yokota et al.
patent: 4759703 (1988-07-01), Krebser et al.
patent: 4784595 (1988-11-01), Halter
patent: 4902454 (1990-02-01), Steinbichler et al.
Haga Kenji
Inaba Yoshiharu
Ito Susumu
Kouketsu Akira
Maeda Kaoru
Fanuc Ltd.
Heitbrink Tim
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