| 摘要 |
<p>The horizontal bars (13) can be selectively moved from a working position, in which they are located at a first level (P), into a rest position in which they are at a level below the second level. Each first working unit has a control mechanism for movement of the horizontal bars. A number of second working units, similar to the first, are supported on the upper bearer. The second units are movable along the longitudinal axis of the bearer and have at least one working head (23) which has tools (23c) for drilling along a vertical axis of the workpiece (2).</p> |
