PURPOSE: To provide possibility of easy execution carrying through various operations of different surfaces to be processed as well as of reducing fatigue for works, by arranging so that a tool retainer can be moved and fixed in accordance with the surface to be processed and that the attitude of operator can be swung through swinging of the bed.
CONSTITUTION: A working table 3 having its bottom surface in the form of a circular arc is furnished on a truck 2, and on this table 3 gate-formed stays 6, 7 are installed upright, at the center of which a vibrating member 8 is hung rotatably in the horizontal direction. At this vibrating member 8 is mounted a base 10 to support the tool retainer 9 with possibility to make vertical motion. At this tool retainer 9 a hollow outer rod 13 is installed through a coupling cylindrical member 66 projecting at the side of a link mechanism 11 with possibility to rotate round the longitudinal direction in the perpendicular plane so as to be slidable in this rod 13 and an inner rod 14 is mounted whose tip can rotate normally with respect to the rotational direction of the outer rod 13. Tool is mounted at the foremost part of this inner rod 14.