| 摘要 |
<p>At least one of telescopic covers (12, 13) is made double and consists of a small telescopic cover (15) arranged on the support (3) guide surface after cross rail (2) and retractable into a connecting part (16) being fixedly coupled with the support (3), a big telescopic cover (17), arranged on the small telescopic cover (15) and connected therewith and retractable into a fixed part (18) being fixedly coupled with the cross rail (2), and a mechanism for coupling said big telescopic cover (17) to the connecting part (16). Outer walls of the telescopic covers (12, 13), the connecting part (16) and the support (3), turned toward the machine working space, follow up with each other and form substantially planar sealing surfaces.</p> |
