Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Patent
1990-12-18
1992-07-14
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
425587, B29C 4554
Patent
active
051298082
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an injection molding machine, and more particularly, to a two-plate type electrically-operated injection apparatus light in weight, compact, and low in cost.
BACKGROUND ART
In general, an injection molding machine is provided with a three-plate type injection apparatus which comprises front and rear plates and a pusher plate disposed between these two plates for reciprocation. The injection apparatus of this type needs a long distance between the front and rear plates, and includes an injection motor and a transmission mechanism operatively connecting the motor and the pusher plate, both the motor and the mechanism being located behind the rear plate. Accordingly, the three plate type injection apparatus requires a wide installation space, thus constituting a hindrance to the reduction in size of the injection molding machine.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a two-plate type injection apparatus light in weight, compact, and low in cost.
In order to achieve the above object, a two-plate type injection apparatus according to the present invention comprises a front plate; a pusher plate movable toward and away from the front plate; an injection screw extending through the front plate and supported by the pusher plate so as to be rotatable and axially immovable relative to the pusher plate; a plurality of ball screws arranged parallel to the injection screw, rotatably supported by the front plate, and extending through the pusher plate, individually; a plurality of ball nuts fixed to the pusher plate and threadedly engaged with the plurality of ball screws, individually; an injection motor fixed to the front plate; a metering motor fixed to the pusher plate; a first transmission mechanism operatively coupling the injection motor and each of the plurality of ball screws; and a second transmission mechanism operatively coupling the metering motor and the injection screw.
According to the two-plate type injection apparatus of the present invention, as described above, the injection screw is supported by the pusher plate so as to be rotatable but axially immovable relative to the pusher plate. The ball screws are rotatably supported by the front plate, threadedly engaged with the ball nuts fixed to the pusher plate, and operatively couple to the injection motor through the first transmission mechanism. The metering motor is operatively coupled to the injection screw through the second transmission mechanism. Thus, a metering process can be executed by driving the metering motor to rotate the injection screw, which is coupled to the metering motor through the second transmission mechanism and rotatably supported by the pusher plate, and an injection process can be executed by driving the injection motor to rotate the ball screws, which are coupled to the injection motor through the first transmission mechanism and rotatably supported by the front plate, thereby linearly moving the injection screw supported so as to be relatively immovable in the axial direction by means of the pusher plate to which are fixed the ball nuts threadedly engaged with the ball screws, individually.
The injection apparatus of the present invention, unlike the three plate type injection apparatus, does not require use of a rear plate which is disposed at a distance from the front plate, and is designed so that the metering motor and the injection motor are fixed to the pusher plate and the front plate, respectively. Accordingly, the installation space of the injection apparatus, especially the axial length thereof, can be reduced, so that the injection apparatus can be made compact. Since the rear plate and its associated parts are not needed, moreover, the number of components of the injection apparatus can be reduced, thus permitting reduction in weight and cost of the injection apparatus.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic perspective view showing an injection apparatus according to one embodiment of the present
REFERENCES:
patent: 4380427 (1983-04-01), Hehl
patent: 4693676 (1987-09-01), Inaba
patent: 4781568 (1988-11-01), Inaba
Watanabe Kikuo
Yoshioka Mitsuski
Fanuc Ltd.
Heitbrink Tim
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