Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – Including feeder to supply stock to charger
Patent
1985-08-22
1986-07-22
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
Including feeder to supply stock to charger
366 79, B29F 104
Patent
active
046016538
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an injection mechanism and to moving a screw in an axial direction to inject a molding material in an injection molding apparatus.
BACKGROUND OF THE INVENTION
A hydraulic or electric motor is used in a conventional injection mechanism for moving a screw in an axial direction to inject a molten molding material. For this reason, the horsepower and size of a motor must be increased in order to perform high-pressure, high-speed injection. However, when the motor size is increased, the injection molding apparatus becomes expensive as a whole. Furthermore, the rotor size of the motor must be increased to prolong the response time due to inertia influence, resulting in inconvenience.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an injection mechanism in an injection molding apparatus, which solves the conventional drawbacks, is low cost, has good response characteristics and provides high-pressure, high-speed injection without using a large motor.
It is another object of the present invention to provide an injection mechanism for performing high-pressure, high-speed injection by superposing a driving force of the motor on energy accumulated in an energy accumulation device.
In order to achieve the above objects of the present invention, there is provided an injection mechanism in an injection molding apparatus, for performing injection by moving a screw forward through a power transmission device for converting rotational movement to linear movement. More particularly a rotating shaft of the motor is coupled to the power transmission device through a first clutch and to an energy accumulation device through a second clutch. During an operation excluding injection and metering, the second clutch is operated to couple the energy accumulation device with the motor to cause the energy accumulation device to accumulate energy, and during injection, the driving force of the motor is superposed on energy accumulated in the energy accumulation device to drive the screw so as to perform high-pressure, high-speed injection.
According to the present invention, energy generated by rotation of the motor during an idle time, i.e., excluding injection and metering times, is accumulated in the energy accumulation device. During injection, the accumulated energy in the energy accumulation device is added to the motor energy. Therefore, high-pressure, high-speed injection can be performed at a high response speed without the need of increasing the motor compact motor can be used, thus providing an economical advantage.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a schematic view showing an injection mechanism according to a first embodiment of the present invention; and
FIG. 2 is a schematic view showing an injection mechanism according to a second embodiment of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows a first embodiment of the present invention. Reference numeral 1 denotes a screw mounted at a distal end of a screw shaft 2. A ball screw 4 as a male screw is coaxially mounted on the other end of the screw shaft 2 through a coupler 3 such as a flange. Reference numeral 5 denotes a servo motor. A sensor 6 is arranged on the servo motor 5 for position detection. A drive gear 8 is mounted at the distal end of a motor shaft 7. A transmission gear 9 is meshed with the drive gear 8. The transmission gear 9 is mounted on a transmission shaft 13 and is coupled to a transmission gear 14 mounted on a transmission shaft 14a through a clutch 12 having clutch plates 10 and 11. The transmission gear 9 is meshed with an operation gear 16 integral with a nut 15 meshed with the ball screw 4. Reference numeral 17 denotes an energy accumulation device. In this embodiment, the energy accumulation device 17 comprises a flywheel. The flywheel 17 is mounted on a wheel shaft 18 and is coupled to a transmission gear 23 mou
REFERENCES:
patent: 3359601 (1967-12-01), Evans
patent: 3375553 (1968-04-01), Criss
patent: 3544665 (1970-12-01), Bowers
patent: 3888393 (1975-06-01), Drori
Fanuc Ltd.
Flint, Jr. J. Howard
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