| 摘要 |
A circular saw is provided which comprises two blades, one blade being locked at a fixed point of the driving shaft, and the other being rigid, a bushing coupled to a sleeve rotating with said driving shaft. The bushing slides along the sleeve, under the action of a lead nut coupled to a screw or a worm driving shaft rotated by a geared motor. By appropriate rotation of the driving shaft it is possible to vary continuously the distance between the two blades.
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