ELECTRICALLY-OPERATED OPENING/CLOSING DEVICE

摘要

Means for advancing and retreating a movable die plate 9 toward and from a fixed die plate 5 includes a moving base 17 in which the upper surface thereof is connected integrally with the movable die plate 9 and a slide unit 21 is installed on the lower surface thereof; a pair of track rails 23 which are provided on the base 1 and form a linear guide by engaging with the slide unit 21; a ball screw shaft 35 which is supported in parallel with the track rails 23 by a bearing provided on the base 1 and in which axial direction is restrained rotatably; a servomotor 45 for driving the ball screw shaft 35; and a ball screw nut 37 which is installed on the lower surface of the moving base 17 so as to threadedly engage with the ball screw shaft 35, and the ball screw shaft 35 and the ball screw nut 37 are provided at an arbitrary position between the paired track rails 23 for linear guide.