To smoothly and rapidly perform the metering operation or purging operation of a molten resin by properly detecting the abnormal supply state of the resin due to a screw in a heating cylinder to certainly prevent the damage of the heating cylinder and the screw.
When the supply operation for sending the molten resin into a resin sump part 8b of the heating cylinder 8 is performed by rotating the injection screw (screw) 9 inserted in the heating cylinder 8 by a screw rotating electromotive servomotor (screw rotating motor) 17, the rotary torque during rotation due to the predetermined rotational speed of the injection screw 9 is monitored on the basis of the load current i2 of the screw rotating electromotive servomotor 17 by a control means 19d of a controller 19 and, when the average torque value at an every predetermined time of the rotary torque becomes a reference torque value, which is set to a torque setting device 21e of a display device 21, or above, the rotation of the injection screw 9 is changed to the rotation due to a rotational speed higher than a predetermined rotational speed and continued.
MASHIMA KATSUYUKI
Tadashi Takahashi
Takashi Watanabe
Masakazu Aoyama
Suzuki Mitsuyoshi
Kazuya Nishi
Yasuhiko Murayama
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