| 摘要 |
PURPOSE:To stably support a rotary body not coaxial with a drive shaft, by providing three or more support pins so that they can be moved in and out. CONSTITUTION:A cutting tool holder (a) is circumferentially uniformly supported in an inclined state inside a support cylinder 1 by a necessary number of support pins 2 on the outside of the holder. Even if the outside surface of the cutting tool holder (a) is going off the inner end of one of the support pins 2 due to the small whirl of the rotating holder, the support pin 2 is protruded by a distance equal to the displacement of the outside surface of thehold holder, by oil pressure, so that the holder does not go out of contact with the pin. Even if the outside surface of the holder (a) pushes the support pin 2, the once-protruded pin cannot be retracted, because of the presence of incompressible oil, and liquid pressure corresponding to the pushing force of the holder is only caused in a valve chamber 3a. |
