BRUSH STRUCTURE

PROBLEM TO BE SOLVED: To provide a brush structure enabling brushes to be removably attached thereto. SOLUTION: This brush structure 61 comprises bristle portions 610a each having a plurality of bristles bundled into a rod shape, a brush socket 612 in which recesses 610B each having both side faces and a bottom face are formed in the positions where the bristle portions 610a are arranged, and rod- shaped bodies 611 of circular cross section which are secured to the brush socket 612 by screws 611a and which, together with the recesses 610B, clamp the bristle portions 610a, the rod-shaped bodies 611 being positioned between brushes 610 whose bristle portions 610a are arranged at equal intervals to one another in such a way as to abut at least either the side faces or bottom faces of the recesses 610B. Thus, the brushes 610 are set in place or removed by loosening the screws 611a and longitudinally sliding the bristle portions 610a between the recesses 610B and the rod-shaped bodies 611 for insertion or removal.