| 摘要 |
<p>The machine has a slide (21) behind, and preferably above, its working area (15), and over a clamping surface (14). A roller cover (39) stands either side of the slide, and rolls up or unrolls as the slide travels to covers the working area. A wall (37) both sides of the slide reaches as far as the upper end of the working area. The cover is attached to it by its free end.</p> |
