Mold clamping mechanism and injection-molding method

A mold clamping mechanism applied to an injection-molding machine that injects a molten resin into a space part formed between a fixed mold and a movable mold which is allowed to come into contact with and separate from the fixed mold when the movable mold is allowed to come into contact with the fixed mold to form a molded product, and pressing to the fixed mold the movable mold that is allowed to come into contact with the fixed mold in a resin molding, the mold clamping mechanism comprising:

• a shaft passing through the movable mold in its moving direction;
• a first actuator operatively connected to the shaft to apply a rotating force to the shaft;
• and
• a second actuator operatively connected to the shaft to apply a force in an opposite direction to the fixed mold to the shaft, wherein in an end part of the shaft in the fixed mold side, an engaging part is provided that is inserted into an inserting part provided in the fixed mold side as the movable mold is allowed to gradually come into contact with the fixed mold and is engaged with a part to be engaged which is provided in the inserting part when the shaft is rotated by a predetermined rotating angle through the operation of the first actuator under a state that the engaging part is inserted into the inserting part to regulate a displacement of the shaft in the opposite direction to the fixed mold, and under a state that the engaging part is engaged with the part to be engaged, the force is applied to the shaft in the opposite direction to the fixed mold through the operation of the second actuator to press the movable mold to the fixed mold.