| 摘要 |
PURPOSE: An air shaft is provided to properly move a core by reducing the frictional coefficient of the core while rotating balls rotate because the rotating balls are attached to the inner circumference of the core when the core moves. CONSTITUTION: An air shaft comprises flanges, housings(100), and rotating balls(200) or rotating rollers. The flanges are installed between main bodies(10) and the housings. The housings are mounted on the flanges and respectively comprise a body, a first housing, and a second housing. The rotating balls or the rotating rollers are accommodated in a receiving part formed in a position where the housing body, the first housing, and the second housing are met.
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