| 摘要 |
PROBLEM TO BE SOLVED: To improve the precision of mold clamping force by controlling the sharp increase of the mold clamping force in mold clamping in the motor- operated direct pressure type mold clamping device for an injection molding machine. SOLUTION: A movable die plate 4 is arranged opposite to a fixed die plate 3. A fixed mold 5 is held on the front surface of the fixed die plate 3, and a movable mold 6 is held on the front surface of the movable die plate 4. The movable die plate 4 is connected to the front surface of a backup plate 2 through four coil springs 9. The nuts 12 of ball screws 10 are fixed to the two corners mutually corresponding to diagonal positions of the backup plate 2, respectively. The screw shafts 11 of the ball screws 10 penetrate the backup plate 2 through the nuts 12. The front end parts of the screw shafts 11 are connected freely rotatably to the fixed die plate 3, and the rear end parts are connected to a motor 20 through pulleys 22 and timing belts 23.
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