| 摘要 |
<p>The lower part of the cutting tool consists of core (1) in plastic material and two guide ledges (2, 3) made of metal. The ledges are higher than the core (1) so that guide edges (8, 9) together with supporting surface (5) of the core form a groove which accommodates the cutting ledge (7). The two guide ledges (2, 3) are bolted together on the core (1) by screws (13) which engage with thread of bushing (11) securely fixed in the plastic core, so that an assembly is created which can stand up to frequent fixing and taking down operations.</p> |
