Mold-clamping device for injection molding machine

A mold clamping device of an injection molding machine that molds a molded article by injecting resin into a cavity formed in a state where a fixed mold and a movable mold are separated from each other, and moving the movable mold in a closing direction to compress the cavity after the resin is injected, the mold clamping device comprising:

• a stationary platen configured to hold the fixed mold;
• a rear platen;
• a plurality of tie bars configured to connect the stationary platen and the rear platen;
• a movable platen disposed between the stationary platen and the rear platen, and configured to hold the movable mold in a manner so that the fixed mold and the movable mold face each other, the movable platen being movable along an axial direction of each of the tie bars;
• and
• at least three parallelism maintaining mechanisms provided between the stationary platen and the movable platen, and configured to maintain parallelism between the fixed mold and the movable mold at least when the resin is injected into the cavity,
• wherein each of the at least three parallelism maintaining mechanisms includes:
• a contraction member including a spring member and configured to contract in the axial direction to generate a biasing force for separating the fixed mold and the movable mold from each other at least when the resin is injected into the cavity;
• and
• a length adjustment member whose length in the axial direction is adjustable to adjust the biasing force generated in the contraction member at least when the resin is injected into the cavity.