| 摘要 |
PURPOSE:To reducing colliding force against a machine strokemost part, by applying output of a dwell adjusting meter to a minor feed-back loop controlling a number of revolutions of a servomotor as a number of revolution instruction value by limiting the output to a value less than a fixed one by a voltage limiter. CONSTITUTION:Injection pressure to be applied to a screw 4 is detected by a load meter 2, amplified by an amplifier 34 for the load meter and becomes a dwell detection value (b). As for a target value (a) and the detected value (b) of the dwell, a deviation is operated by an addition and subtraction operating device 27, a dwell deviation value (c) of the same becomes a number of revolution instruction value (d) through application of PD operation to the dwell deviation value (c) by a dwell control meter 28, which is limited to a value less than a fixed one by a voltage limiter 29 and applied to a minor feedback loop 35. The number of revolutions of a servomotor 2 is amplified by an amplifier 33 for detecting the number of revolutions and becomes a number of revolution detection value (e), a deviation (f) with the number of revolution instruction value (d) ihs operated by an addition and subtraction operating devide 30, to which PID operation is applied by a speed control meter 31 and becomes a torque instruction value (g), in a minor feedback loop 35. In addition to the above, an armature current corresponding to the instruction value (g) is applied to the servomotor 2 and advance thrust control of the screw 4, that is, dwell force control of the screw 4 is performed. |
