| 摘要 |
PROBLEM TO BE SOLVED: To safely and smoothly perform mold on-off operation by accurately setting a speed change start point corresponding to a mold on-off speed to properly perform the speed change control of the mold on-off speed at a speed change point. SOLUTION: A speed changeover device 13 operates a servo amplifier (drive means) on the basis of the set value of a mold on-off speed setting device 11 and a movable platen is moved by an electromotor and the position thereof is inputted to a present value comparator 15 as an encoder signal (e). When the signal (e) coincides with the set value of a speed change point setting device 14, a signal (i) is sent to the speed changeover device 13 from the present value comparator 15 and a mold on-off speed is changed from the speed of a front stage to the speed of a next stage. In this case, if a changeover switch 20 is changed over toward an a-terminal by a selection switch 22, speed change completion control wherein a speed change is completed is performed on the basis of the speed change point set value at a time of mold closing and, if the changeover switch 20 is changed over toward a b-terminal, mold on-off operation is judged to be a speed change from a high speed to a low speed by a judge device 21 and speed change completion control wherein a speed change is completed is performed on the basis of the speed change point set value.
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