| 摘要 |
PURPOSE:To enable correction of displacement through one-control, by a method wherein a circuit, which determines a difference between each of a set slewing and a stop position and a present slewing position and that the present slewing position is near to either of the two set positions, is provided, and based on the difference, both the new set slewing and stop positions are determined. CONSTITUTION:In a controller 13 which, based on the slewing lever control condition and a present slewing angle, causes a slewing control valve 10 to be automatically stopped in set and slewing positions thetaa, and thetab, a cirfcuit, which corrects the set slewing and stop positions thetaa and thetab, is additionally attached to a setter 12. The correcting circuit is formed with switches 25A and 25B, which instructs correction of the set slewing and stop positions thetaa and thetab; a means 16 which stores a present slewing angle thetax; means 17, 19, and 20 which decide that the present slewing angle thetax is near to either of the set slewing and stop positions thetaa and thetab and determines a difference therebetween; and a means 18 which, based on such difference, determines new set slewing and stop positions theta'a and theta'b to instruct the result to the controller 13. |
