| 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 by driving the disc cutter (12) about separate oscillating a nd nutating axes AA, BB which are angularly offset from one another and which intersect at a point ahead of the disc cutter (12).</SDOAB ></p> |
