Patent ID: 8186989

Claim:
An injection molding machine, comprising: an injection unit, the injection unit having a moving cylinder and an ejecting cylinder; a molding clamp, the molding clamp having an injecting cylinder and a molding clamp cylinder; a hydraulic pump having a plurality of fixed discharge flow rates, including a first fixed discharge flow rate and a second fixed discharge flow rate which is different than the first fixed discharge flow rate; a switching device receiving fluid from the hydraulic pump, the switching device connected to the moving cylinder, the ejecting cylinder, the injecting cylinder and the molding clamp cylinder; and a controller configured to control the hydraulic pump to operate at only one of the fixed discharge flow rates, wherein the controller is further configured to control the hydraulic pump to switch from the first fixed discharge flow rate to the second fixed discharge flow rate, to be corresponding to a change from one operational process of the injection unit to another operational process and configured to control each operational process by variably controlling the number of revolutions of a drive motor in the hydraulic pump wherein the hydraulic pump is a variable discharge type hydraulic pump having a swash plate, and the fixed discharge flow rates are set according to a change into an inclination angle of the swash plate.