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
1986-07-23
1988-01-12
Woo, Jay H.
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
264 407, 366 78, 425149, 425159, 425376B, 425582, 425583, 425587, B29C 4577
Patent
active
047188405
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to an injection molding machine and, more particularly, to an injection/measurement mechanism which can perform injection, measurement, and mixing with a large output and which is driven by a servo motor.
Injection molding machines, wherein a screw is rotated so that a measurement mechanism for performing measurement and mixing of a mold material is driven by a motor, are conventionally known. Most conventional injection molding machines which move screws forward in order to inject a molten molding material employ hydraulic units as drive sources. Some such conventional injection molding machines use servo motors as drive sources for their injection mechanisms, as described in Japanese Provisional Patent Publication Nos. 58-179630 and 59-156726. With these machines, however, it is difficult to obtain a large output.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an injection/measurement mechanism of an injection molding machine, which uses a servo motor as a drive source for its injection and measurement/mixing mechanisms and which can obtain a large output.
In order to achieve the above object, according to the present invention, at least two ball screws, which are rotatably provided between a front plate and a rear plate, the plates being fixed to a base of an injection molding machine, and an injection servo motor, which drives the at least two ball screws, are operatively coupled through a first transmission unit. A screw sleeve is rotatably fixed to a pressure plate on which ball nuts engaged with the at least two ball screws, respectively, are fixed. A screw and a spline shaft are fixed on the screw sleeve.
A rotational drive pipe coupled to the spline shaft and a measurement servo motor, which drives the rotational drive pipe, are operatively coupled through a second transmission unit. As a result, the respective servo motors drive the screw with a large drive force in the injecting direction, and rotate it.
In this manner, according to the present invention, servo motors can be used as the respective drive sources of the injection and mixing/measurement mechanisms, so that injection and measurement can be controlled easily. Furthermore, the outputs from injection and measurement servo motors are converted into a screw drive force along the injecting direction and a screw rotating force reliably and efficiently, so that an injection/measurement mechanism of a large output can be obtained.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a partial sectional front view of an injection/measurement mechanism of an injection molding machine according to an embodiment of the present invention;
FIG. 2 is a partial sectional plan view of the unit shown in FIG. 1;
FIG. 3 is a partial sectional exploded view for explaining the connection relationship between a screw sleeve and a screw; and
FIG. 4 is an end face view of the screw sleeve of FIG. 3 seen from the right side.
DEETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIGS. 1 and 2 show an injection/measurement mechanism of an injection molding machine according to an embodiment of the present invention. In FIGS. 1 and 2, reference numeral 1 denotes a mount base for mounting the injection/measurement mechanism to the base of the injection molding machine. A front plate 2 and a rear plate 3 are fixed to the mount base 1 with bolts or the like. Four tie rods 4-1 to 4-4 are fixed between the front and rear plates 2 and 3 with bolts. A heating cylinder 5 is fixed to the front plate 2 with a barrel nut 6. A screw 7 is fitted in the heating cylinder 5. Reference numeral 8 denotes a hopper for charging a molding material into the heating cylinder 5. The hopper 8 is mounted on the heating cylinder 5 through a hopper base 9. The molding material is charged into the heating cylinder 5 through a hole 10. The screw 7 is rotatably fixed to a pressure plate 14 through a screw sleeve 11, a screw retainer 12, a nut 13, and so on. More specifically, the screw sleeve 11 is rotatably
Inaba Yoshiharu
Masato Yamamura
Fanuc Ltd.
Heitbrink Timothy W.
Woo Jay H.
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