| 摘要 |
A drilling/tapping/unscrewing apparatus including a transmission shaft of a power source on which a drilling ratio gear, a tapping ratio gear and an unscrewing ratio gear are mounted for transmitting the power of the power source to a bit. The apparatus further includes an adjustment unit for controlling the switching between the drilling, tapping and unscrewing operations of the apparatus. The adjustment mechanism includes a bit shaft on which a drilling gear, a tapping gear and an unscrewing gear are fitted. The tapping gear and the unscrewing gear are respectively engaged with the tapping ratio gear and the unscrewing ratio gear. The drilling gear and the tapping gear are controlled by an adjustment button to synchronously move up and down on the bit shaft, whereby the drilling gear can be engaged with or disengaged from the drilling ratio gear.
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