| 摘要 |
An idle driving operation preventing device (40) includes an engaging member (45) disposed on a pusher (31). The engaging member (45) can engage a stopper member (47) coupled to an operation member (5a), so that the movement of the operation member (5a) for driving the fastener (n) can be inhibited. The engaging member (45) is biased by a biasing force that is smaller than a biasing force applied to the pusher (31).
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