Heater control device in injection molding machine

Details Heater control device in injection molding machine Heater control device in injection molding machine

1995-06-06

1996-12-10

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219491, 219501, 363 36, H05B 102

Patent

active

055827560

ABSTRACT:
A semiconductor switching circuit is connected to a DC power source for an inverter to control a servomotor in an injection molding machine, and a PWM signal controls an ON/OFF operation of a switching device in the semiconductor switching circuit so as to feed power to a heater of the injection molding machine. Since the DC power source feeds the heater with power, it is possible to overcome irregularity in power supply, and linearly vary a conducting time, thereby finely and accurately controlling a temperature. The DC power source for the inverter to control the servomotor also serves as a DC power source for the heater, resulting in no need for a special power source circuit.

REFERENCES:
patent: 4638135 (1987-01-01), Aoki
patent: 4745263 (1988-05-01), Brooks
patent: 4931609 (1990-06-01), Aoki
patent: 5004881 (1991-04-01), Lee

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