POWER TOOL

摘要

An electronic pulse driver (1) includes a motor (3), a hammer (4), an anvil (5), an end tool mounting unit (51), a power supply unit (24), and a control unit (72). The hammer (4) is rotationally driven in forward and reverse directions by the motor (3). The anvil (5) is rotated upon striking the hammer (4) against the anvil as a result of a rotation of the hammer in the forward direction after rotation of the hammer in the reverse direction for obtaining a distance for acceleration in the forward direction. The power supply unit (24) alternately supplies to the motor (3) a forward electric power and a reverse electric power in a first cycle. The control unit (72) controls the power supply unit (24) to alternately supplies the forward electric power and the reverse electric power in a second cycle shorter than the first cycle when an electric current flowing to the motor (3) increases to a prescribed value.