Patent ID: 7021917

Claim:
A control device in an injection molding machine comprising a screw driving apparatus used to advance and retract the screw, and a screw rotating motor used to rotate the screw, wherein metering of the resin is performed by driving the screw driving apparatus so that the screw is retracted to the set metering completion position while driving the screw rotating motor so that the screw is caused to rotate, said control device comprising: means for detecting the resin pressure; means for detecting the screw position; means for determining the positional deviation between the set metering completion position and the current screw retraction position; means for determining the pressure deviation between the set resin pressure and the current detected resin pressure; and screw rotational speed adjustment means for adjusting the screw rotational speed command on the basis of said positional deviation and said pressure deviation after a set screw rotational speed adjustment point has been reached.