Patent ID: 8523499

Claim:
A working device comprising: a base stage, a workpiece hold and rotate means mounted on said base stage for holding and rotating a workpiece about an axis, a working means, mounted on said base stage, being movable in a forward direction to be closer to and in a rearward direction to be farther away from said workpiece axis, and provided with a working tool arrangement for carrying out a predetermined working on an obverse side and a reverse side of said workpiece that is opposite to said obverse side, a pressing means for pressing said working means toward said workpiece, and a tracing means provided on said working means, composed of a workpiece obverse side tracing member corresponding to said obverse side of said workpiece, and a further tracing member in the form of a workpiece reverse side tracing member corresponding to said reverse side of said workpiece, said workpiece obverse side tracing member and said workpiece reverse side tracing member both being configured for moving said working means in said forward and rearward directions by becoming in contact with said workpiece and tracing a shape of said workpiece.