Abstract: An apparatus for controlling an injection molding machine includes a slipping detection device to detect the slippage of a pump motor which drives a hydraulic pump; a rotational velocity sensor which detects the rotational velocity of the pump motor, for example; and an instruction signal correcting circuit having an addition circuit which adds the operation circuit which obtains from the detected signal of the rotational sensor a flow rate instruction correcting signal to compensate the reduction of the discharge flow rate due to the increased slippage, and the flow rate instruction correcting signal to the flow rate signal, and then, detects the slippage of the pump motor and corrects the magnitude of the flow rate instruction signal thereby to compensate the discharge flow rate.

Abstract: A controller for a molding machine is capable of easily setting control data without considering the speed-control area and the pressure-control area. To achieve the object, the controller comprises: an input unit for inputting speed of a movable section of the molding machine with respect to positions thereof and time, and resin pressure; a memory for storing data, which include the speed of the movable section and the resin pressure inputted; and a control unit for controlling the speed of the movable section and the resin pressure on the basis of the data stored in the memory. In the controller, the speed and the pressure can be inputted independently, and proper control data, which match molding conditions, can be defined easily.