| 摘要 |
A braking unit for nail drivers, mainly a rotary retaining unit pivotally mounted on lateral sides of a punch channel of a nail driver, comprises a front blocking portion, a first cam, a second cam and a handle portion. The first cam is engaged with the securing slide rod so as to restrain the slide rod. The second cam is inserted into a punch channel to engaging nails within the channel. Thereby, when the nail cartridge is loaded, the retaining unit releases the securing slide rod so that the trigger can be pulled to punch a nail. It can sense the emptiness of the cartridge so as to restrain the slide rod and invalidate the trigger. The handle portion can be pushed so as to rotate the first cam and the second cam out of the punch channel, whereby a striking test with empty nail cartridge can be performed.
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