Pressure detection apparatus of injection molding machine

A pressure detection apparatus of an injection molding machine comprising a drive mechanism, which in turn comprises a drive motor and a ball screw mechanism, and a movable member, which is moved in a reciprocating manner by the drive mechanism, the pressure detection apparatus comprising:

• a pressure reception member disposed in the drive mechanism in such a manner as to be movable in a reciprocating direction of the movable member while being guided by a guide member, a ball screw or nut of the ball screw mechanism being fixedly attached to the pressure reception member;
• a load cell disposed between the drive mechanism and the movable member, the load cell being fixed to one of a bearing ring retainer facing the movable member and the pressure reception member while abutting the other;
• and
• a restraining mechanism disposed between the movable member and the pressure reception member and enabling the pressure reception member to be displaced with respect to the movable member in the reciprocating direction by a distance determined by a length of a guide pipe of the restraining mechanism.