| 摘要 |
<p>A rock excavating or cutting device (10) including a disc cutter (12) that i s driven by drive means (20) to rotate in an oscillating and nutating manner b y driving the disc cutter (12) about separate oscillating and nutating axes AA , BB which are angularly offset from one another and which intersect at a poin t ahead of the disc cutter (12).</p> |
