| 摘要 |
PROBLEM TO BE SOLVED: To enhance working accuracy by eliminating an error between a command value and an actual movement value of a cutting tool. SOLUTION: By providing a cutting tool supporting arm (11) extending axially via a fulcrum (12) being orthogonally crossed with this in the axial center portion of the tip side of a spindle (10) swingable and in an impossible state of a relative rotation, by providing an engaging pin (17) parallel to the above fulcrum (12) in the rear portion of the above cutting tool supporting arm (11), by providing a draw bar (20) being moved axially in an internal deep portion of the above spindle (10), and by providing an engaging body (21) engaging slidably with the above engaging pin (17) in the above draw bar (20), a sliding face with the above engaging pin (17) of the above engaging body (21) is made as a curved face for retaining in a proportional relationship between a reciprocating movement of the above draw bar (20) and a radial movement of the tip in the cutting tool supporting arm (11). COPYRIGHT: (C)2004,JPO
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