| 摘要 |
PURPOSE:To facilitate reciprocation of a box and to improve durability of the box by disposing a side rotor capable of projecting and sinking on a holding portion of the box in such a manner that the rotor is brought into contact with the side of a track enough. CONSTITUTION:An adjust screw 21' is fitted in a tapped hole 21 mounted on a holding portion 11 of a box B. If the contact surface of a side rotor 31 is not brought into contact with the rolling side 2 of a track A enough, the adjust screw 21' is moved, and a support 23 is moved forward and backward by utilizing the forward and backward movement of the adjust screw 21' to the holding portion 11, so that the rotor 31 fixed on both sides of the support 23 is controlled to be brought into parallel contact with the rolling side 2 of the track A, whereby the reciprocation of the box B to the track A can be extremely quick in movement. |
