Patent ID: 7798799

Claim:
A measurement control method for an injection molding machine in which a measurement is performed by rotating a screw, comprising the following steps: setting a first ending target position corresponding to a measurement ending position, setting a rotation rate pattern to rotate the screw, retracting the screw at a predetermined retraction rate pattern wherein the retraction is pre-set, setting the first ending target position at a time of measurement of a remaining rotation rate pattern to stop the screw rotation at said first ending target position is predicted by a calculation based on a screw position detected at every specified time interval, controlling the screw rotation to the first ending target position based on the remaining rotation rate pattern and thereafter performing a reverse rotation to apply a back pressure to the screw, stopping a screw retraction at a second ending target position predicated by a calculation based on a screw retraction rate detected at every specified time interval, controlling the screw based on the retraction rate pattern to retract to said second ending target position, stopping the rotation and retraction of the screw when the screw reaches said second ending target position, and subsequently controlling the screw to reverse rotate by a preset constant amount of rotation while controlling the position of the screw to cause a depressurization.