To ensure smooth action of a movable cover by attaining dust-prevention of a link plate since there is risk that failure of action is generated by the fact that a cutting powder is especially deposited in a guide groove of the link plate conventionally when the link plate for opening/closing the movable cover for covering a lower side of a rotation blade while interlocked with a cutting body machine is included in a bench cutting machine.

A shielding plate 110 is arranged between the link plate 100 arranged along a side wall 11b of a body case 11 and the rotation blade 12. Thereby, the cutting powder rolled up from a cutting portion toward a dust-collection port 105 is not blown to the guide groove 100b of the link plate 100.