Abstract: A clamping system includes a fixed platen fixed to one end of a machine base and a plurality of clamping cylinders, the fixed platen holding a fixed mold therein, a movable platen fixed to the other end of the machine base and holding a movable mold therein, a plurality of tie bars extending through the movable platen and including pistons at their one ends, the pistons being slidably received within the clamping cylinders, and screw threads or grooves substantially at their longitudinal center, a unit disposed between the movable platen and the fixed platen and operable to move the movable platen to and from the fixed platen, two-part nuts mounted to the movable platen and meshingly engageable with the screw threads or grooves of the tie bars, and stoppers each of which is engaged with a recess provided on each of the tie bars mounted to the movable platen on the side opposite to the fixed platen characterized in that screws are threaded at end portions of the tie bars on the side of the fixed platen, screws

Abstract: A clamping system includes a fixed platen fixed to one end of a machine base and a plurality of clamping cylinders, the fixed platen holding a fixed mold therein, a movable platen fixed to the other end of the machine base and holding a movable mold therein, a plurality of tie bars extending through the movable platen and including pistons at their one ends, the pistons being slidably received within the clamping cylinders, and screw threads or grooves substantially at its longitudinal center, a unit disposed between the movable platen and the fixed platen and operable to move the movable platen to and from the fixed platen, and two-part nuts mounted to the movable platen and meshingly engageable with the screw threads or grooves of the tie bars.