Importance

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Abstract

The retreat completion position of the screw in the charging step in actual production is controlled based on the result in pilot production as follows. In pilot production, the measurement value Ts of the screw driving torque is integrated with respect to the screw position P from the forward limit to the retreat completion position Ps. When conforming item is produced in the pilot production, the value .SIGMA.Ts.multidot.dP obtained as a result of the integration is stored as a reference value. After actual production begins, the measurement value Tx of the screw driving torque is integrated in real time with respect to the screw position P from the forward limit to the screw position at each time. The obtained value .SIGMA.Tx.multidot.dP is monitored. When this value .SIGMA.Tx.multidot.dP coincides with the reference value .SIGMA.Ts.multidot.dP, it is determined that the charging step has been completed, and the retreat operation of the screw is stopped.

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First Claim