To efficiently remove dust or the like stuck to a work by using a roll brush without sacrificing the feed rate of the work.

To remove the dust or the like stuck to the work by using the roll brush 31 obtained by winding a brush bristle-flocked channel spirally around a rotary shaft 32 which is rotary driven by the prescribed rotary driving means (a motor), the brush 31 is made to move several times reciprocally in the shaft direction by a shaft direction driving means consisting of a disc cam 34 and its follower 33 while the brush 31 is rotated once.