| 摘要 |
<p>Provided is a tool holding structure capable of effectively preventing a cutting tool from coming off a chuck portion. An outer fitting portion (A) is formed in an outer face of a shank portion (2) of a cutting tool (T) and an inner fitting portion (B) is formed in an inner face of a chuck portion (12) of a tool holder. A fitting member (20) is provided to be fitted to the outer fitting portion (A) and the inner fitting portion (B) respectively. The fitting member (20) includes a protruding portion (22) which protrudes from an outer circumference of the shank portion (2) when fitted to the outer fitting portion (A). A guide groove (18) is formed for guiding the protruding portion (22) of the fitting member (20) from an open side of an inner space (13) to the inner fitting portion (B). The inner fitting portion (B) includes a rotation preventing face for preventing relative rotation between a holder body (10) and the cutting tool (T) in association with contact thereof with the protruding portion (22) and a slip-out preventing face for preventing slip-out of the cutting tool (T) in association with contact thereof with the protruding portion (22).</p> |
