| 摘要 |
A spindle ( 5 ) has a chuck ( 9 ) provided on a distal end ( 5 a) thereof for chucking a tool ( 11 ), and a nut ( 13 ) screwed to the distal end ( 5 a) and rotatable for tightening and loosening the chucking. The spindle ( 5 ) is positioned relative to a nut loosening station provided with a nut loosening driver ( 43 ) for driving the nut ( 13 ) to rotate in a loosening direction, the nut ( 13 ) is loosened by the nut loosening driver ( 43 ) to remove from the chuck ( 9 ) a first tool ( 11 ) to be replaced with a second tool ( 11 ), the spindle ( 5 ) is positioned relative to a nut tightening station provided with a nut tightening driver ( 41 ) for driving the nut ( 13 ) to rotate in a tightening direction, and the nut ( 13 ) is driven by the nut tightening driver ( 41 ) to tight-chuck the second tool ( 11 ).
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