| 摘要 |
PROBLEM TO BE SOLVED: To efficiently perform fixing work or maintenance work of a ball storage box by simply attaching/detaching the ball storage box. SOLUTION: The ball storage box 33 is arranged in a box-attaching area 32 of a front face frame 2, and the storage box 33 is pivotally fitted so as to rotate freely within a horizontal surface. A plurality of pawl parts 70 engaging with the ball storage box 33 within the box-attaching area 32 sliding the outer periphery edge of the box-attaching area 32 are arranged, and a pivotally fitting part consists of a shaft hole 68 and a shaft pin 55 to be put through the shaft hole 68 in a removable state. COPYRIGHT: (C)2007,JPO&INPIT
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