To smoothly decrease the speed of an actuator so as to stop by providing an electric pressure reducing valve, a pressure detector, a deceleration computing part and an output correcting means between at least one of pilot operating devices and a flow control valve corresponding to this.
The invasion prohibition territory of a front member is previously indicated by a setter 7 according to an operation. When a monitor point approaches the prohibition territory and the distance to the prohibition territory becomes small, a first command current value is computed. Meanwhile a second command current value corresponding to pilot primary pressure is computed, and the smaller one of the first and second command current values is output to proportional solenoid valves 10a-11b as an electric signal. When the first command current value approaches the prohibition territory exceeding the distance where the first command current value becomes smaller than the second one, the first command is selected so as to gradually decrease the operating speed of an actuator and reach zero speed, and hence a front device is stopped. Hereby, the actuator can be smoothly stopped.
WATANABE HIROSHI
HAGA MASAKAZU
