| 摘要 |
PURPOSE:To ensure proper balance over the entire range of turning angles by applying the constitution wherein a reaction force is generated against the partial load of a burning body in motion and the reaction force is controlled with a detected output from a circuit for detecting the turning angles of the body. CONSTITUTION:Then a headstock 8 is turned, a turning angle at each moment is outputted from a detector 32 to a discriminating circuit 49 and a logic circuit 51. Then, the discriminating circuit 49 sends a signal to a solenoid valve control circuit 50 upon the start of the clockwise turn of the headstock 8 from a vertical position, and selects a solenoid valve so that hydraulic pressure can be supplied to a hydraulic cylinder 39 in the inclined direction of the headstock 8. Concurrently, the logic circuit 51 computes a value matching the partial load of the headstock 8 changing with a turning angle and outputs the value to a pressure control circuit 52. Upon receipt of the value, the pressure control circuit 52 adjusts voltage applied to a proportional solenoid relieve valve 43 so as to obtain feed pressure to the hydraulic cylinder 50 proportional to the aforesaid value, thereby adjusting the feed pressure. A reaction force corresponding to the partial load of the headstock 6 is obtained from the thrust of a piston generated due to the aforesaid feed pressure. |
