Patent ID: 8721941

Claim:
A method for driving at least one of (a) a mold closing system and (b) a calibration blow mandrel system of an extrusion blow molding machine, comprising of the following steps: activating exactly one electric motor to move out a push rod starting from an initial position using a push mechanism; activating an additional braking device of the electric motor on a reaching of one of (a) a required torque of the electric motor and (b) a required force of the electric motor to hold the push rod in a state of one of (i) the required torque and (ii) the required force in its instantaneous position, wherein at least one of (i) the absolute value of a peak torque exerted by the electric motor immediately before the activating of the additional braking device is at least 1.5-fold a nominal torque of the electric motor and (ii) the absolute value of a peak force exerted by the electric motor immediately before the activating of the additional braking device is at least 1.5-fold a nominal force of the electric motor; switching the electric motor into a currentless state; re-activating the electric motor to one of the previously generated torque and the previously generated force after a preset blow molding process time; subsequently de-activating the additional braking device; activating the electric motor to move in the push rod using the push mechanism; and moving the push rod back in the initial position using the electric motor and the push mechanism.