VORRICHTUNG ZUR ABTRENNUNG VON FORMBEFÜLLUNGEN IN EINER FORMPRESSMASCHINE

An apparatus for severing mold charges of molten plastic exiting an orifice along an orifice axis includes a motor system that provides a rotary output around an axis offset from the orifice axis. A blade arm is eccentrically coupled to the rotary output of the motor system for motion in a plane at an angle to the orifice axis, preferably perpendicular to the orifice axis. A knife blade is coupled to the blade arm and disposed to oscillate in a closed path, preferably an elliptical path, that intersects the orifice axis so that the knife blade engages and severs molten plastic exiting the orifice along the orifice axis. A control arm preferably is pivotally coupled to the blade arm and to a point that is fixed with respect to the orifice axis to control motion of the blade arm and the knife blade. The motor system preferably is mounted on a base, and has an output shaft that extends through the base and a hub coupled to the output shaft. The blade arm is pivotally coupled to the hub eccentrically of the shaft. The knife blade preferably has a cutting edge that is at an angle to the blade arm.