Metering apparatus of injection molding machine

A metering apparatus of an injection molding machine which includes a screw, a screw rotating motor for rotating the screw, an injection mechanism for moving said screw in an axial direction during metering, and an injection servo motor for driving said injection mechanism, said metering apparatus comprising:

• means for detecting a position of said screw;
• memory means for storing a screw completion position indicating a metering point at which metering is to be completed;
• metering point detecting means for comparing the detected screw position and the screw completion position stored in said memory means for determining whether the screw has reached the metering point;
• screw deceleration point detecting means for comparing the detected screw position and a decelerating screw position, the decelerating screw position being set at a position slightly prior to the metering point, and for determining whether said screw has reached a screw deceleration position;
• and
• rotation control means for decreasing rotation speed of said screw rotating motor when said screw deceleration point detecting means indicates that said screw has reached the decelerating screw position and for stopping said screw rotating motor at the metering point as prescribed by said metering point detecting means.