| 摘要 |
PCT No. PCT/JP86/00167 Sec. 371 Date Dec. 8, 1986 Sec. 102(e) Date Dec. 8, 1986 PCT Filed Apr. 7, 1986 PCT Pub. No. WO86/06021 PCT Pub. Date Oct. 23, 1986.An output torque of a servomotor is controlled to prevent overrun of an injection mechanism in an injection molding machine. The injection mechanism is driven by the servomotor to perform an injection operation of the injection mechanism. The injection molding machine includes a torque limit circuit which limits a value of a torque instruction output from a servo circuit of the injection mechanism operating in an injection direction to a value of a torque limit instruction from a numerical control apparatus and does not perform a torque limit operation of a drive instruction in a direction opposite to the injection direction. Therefore, the servomotor for driving the injection mechanism can be rapidly decelerated to prevent overrun of the injection mechanism.
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