To ensure the forced rotation of an abrasive disc when the abrasive disc is used in a state that it is pressed to a work piece with strong force.
In this eccentric-disc-shaped grinder where an abrasive disc 14 is operated through a driving shaft 16 by a motor in a casing 12, an eccentric body supporting part 20 relatively unrotatably connected to the driving shaft supports an eccentric pin 18, the eccentric pin is relatively unrotatably connected to the abrasive disc and further rotatable on an axis 24 with a predetermined eccentric amount e to the driving shaft by the bearing abrasion in a rolling bearing 22, the abrasive disc is circularly moved on an axis of the driving shaft with the eccentric amount e, and simultaneously rotated on an axis of the eccentric pin, and a braking means 26 restricts the rotation of the freely rotatably abrasive disc in particular in a state that the work piece and the abrasive disc are not kept into contact with each other, an inner peripheral face of the ring-shaped braking means is bonded or connected to the abrasive disc with shape engagement.
DEHDE JOERG
LEMMEL JOERG
