| 摘要 |
PURPOSE: To reliably cutting remove chips without entangling them with each other by arranging at least a single opening part to form a passage in a tank- shaped vessel, in an edge part on the side facing to a side wall of an upper surface in a single cover element. CONSTITUTION: A reciprocating unit is covered with a cover, and the cover is composed of plural elements 21 to 25 slidingly movable in a telescope type in a mutually superposed condition. The element 21 closest to a workpiece table is rigidly joined to the table, and the smallest element 25 is joined to a side wall 40 vertically extending to the X axis. An opening part 39 is arranged on an upper surface of the element 25. A drawing shows a condition just before the respective elements 21 to 24 reach a left side tail end position. In this case, since a lip seal 53 of the second small element 24 already reaches a range of the opening part 39, cutting chips 60 and cutting oil 61 scraped off by lip seals 50 to 53 fall in a tank-shaped vessel 41 by passing through the opening part 39. Therefore, the cutting chips 60 are avoided in forming an entangled lump in this side range of the side wall 40. |
