| 摘要 |
PURPOSE:To make it possible to vary continuously the projected amount of a copy cutter of a shield excavator in accordance of a command value. CONSTITUTION:Information indicating a revolving position of a copy cutter 8 monolithically revolving with a cutter frame 3, information indicating the projected amount of the copy cutter 8 by corresponding with the revolving position thereof and information indicating the projected amount of the copy cutter 8 in real time is processed. The expansion amount of a piston rod 14a of a copy cutter jack 14 are controlled through a servo valve 23 so that the projected amount of the copy cutter 8 is equivalent to the command value. |
