Sumitomo Heavy Industries, Ltd.

Yoshihiko Nagata

Hitoshi Hara

Kazuo Hiraoka

Atsushi Ishikawa

Yoshiyuki Imatomi

In an injection molding machine which comprises a mold composed of a fixed mold attached to a fixed platen and a movable mold attached to a movable platen, and a driving source for driving the movable platen to open and close the mold, a distance sensor detects, as a platen interval, a distance between two positions preliminarily selected on the fixed platen and the movable platen and produces a distance detection signal. A pressure sensor detects a clamping pressure applied by the driving source and produces a pressure detection signal. A control unit controls the driving source to adjust the platen interval and the clamping pressure through a plurality of steps in response to the distance detection signal and the pressure detection signal.

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Chiba, Japan

Yoshihiko Nagata