To improve dust collection efficiency of a cyclone unit without impairing compactness of a dust box, unlike the prior art, in which dust is collected by a single cyclone unit so that it is difficult to improve the dust collection efficiency of the cyclone unit while securing compactness thereof, in a bench circular saw machine having a cyclone dust collection type dust box.
A plurality of cyclone units 32, 32 are disposed in a box body 31, in parallel with each other. Dust collecting air in the box body 31 is blanched and used in each cyclone unit 32 to separate and collect powder dust. Without impairing the compactness, particularly, in a height direction of the dust box 30, a dimension balance of each cyclone unit 32 is desirably set to increase the dust collection efficiency thereof.
OKUHIRA YUTA
TANAKA TAKESHI
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