| 摘要 |
PURPOSE:To accurately carry out parallel drilling and inclined drilling at a specified angle with ease by controlling the direction of a guide cell based on the output of an angle detector mounted on each movable member that supports the guide cell. CONSTITUTION:A revolution angle detector 22 to detect the revolution angle of an boom 1, a swing angle detector 23 to detect the swing angle of a swing arm 9, an inclined angle detectors 20 and 21 to detect the inclination angle theta of a guide cell 14, a turning angle detector 24 to detect the turning angle of the guide cell 14 and an angle setting device to set the direction of a drilling hole are provided respectively. The detection signals of respective detectors 20-24 are compared with each set up signal and directional contol is applied to the guide cell 14 in accordance with each compared output. |
