Mold clamping apparatus for injection molding machine

A mold clamping apparatus for an injection molding machine, for closing and opening a mold including a stationary mold and a movable mold and for clamping the mold closed, said mold clamping apparatus comprising:

• a stationary platen fixedly holding the stationary mold;
• a movable platen fixedly holding the movable mold and disposed opposite to the stationary platen;
• tie bars for connecting the movable platen to the stationary platen in a manner that the movable platen moves toward and away from the stationary platen;
• a movable platen driving means that is electrically driven for moving the movable platen along the tie bars to close and open the mold;
• a rear mount plate disposed behind the movable platen and connected to the tie bars;
• a mold clamping ram extending between the rear mount plate and the movable platen to exert a mold clamping force on the movable platen;
• and
• clamping force applying means for applying an intensified mold clamping force to the molds, said clamping force applying means including:
• a ram support member for supporting the mold clamping ram in an axially movable manner;
• a hydraulic cylinder actuator having a cylinder bore formed in the rear mount plate;
• a piston section formed on a rear end of the ram support member and fitted in the cylinder bore;
• a pressure intensifier having therein an intensifier pressure chamber communicating wit the hydraulic cylinder actuator;
• a pressure applying member fitted in the intensifier pressure chamber to apply pressure to hydraulic fluid in the intensifier pressure chamber;
• and
• a pressure applying member driving means that is electrically driven for axially shifting the pressure applying member in the intensifier pressure chamber.