Abstract: A mold clamping device in an injection molding machine comprises a first platen for retaining a first mold therein and a second platen for retaining a second mold therein; a platen feeding mechanism for moving said first and second platens relative to each other on said table; electromagnetic coils arranged on the opposite surfaces of the first and second platens; and a control device for controlling the amount of the current supplied to the electromagnetic coils. The mold clamping operation is carried out using the magnetic attracting force generated by the electromagnetic coils.

Abstract: A non-linear function f(A) of an effective value D' with respect to a desired value A regarding speed, pressure or the like of an actuator of a hydraulic apparatus in a closed loop control for the hydraulic apparatus is operated and a value regarding quantity of electricity to be applied to a valve of a drive mechanism of the hydraulic apparatus is outputted as a non-linear function f(A) in a case where a non-linear function D=f(A) is established between the desired value A and an effective value D regarding speed, pressure or the like of the actuator in the opened loop control for the hydraulic apparatus.