Mold opening and closing apparatus for electric injection molding machine

摘要

A mold opening and closing apparatus for an electric injection molding machine which performs mold opening and closing actions by a toggle link mechanism having a first arm rotatably supported by a toggle support, a second arm pivotally joined to the first arm and to a movable platen, and an electric drive device for rotating the first arm. The apparatus includes a coil spring for urging the first arm toward a mold opening position of the first arm. The moment caused by the weight of the first and second arms in their mold clamping positions can be canceled by the virtue of the coil spring, thereby enabling the machine to exhibit improved performance of low-pressure mold clamping force.