| 摘要 |
<P>PROBLEM TO BE SOLVED: To accurately detect hammering without being affected by a variation in the vibration transmission properties of a housing due to a variation in temperature and humidity. Ž<P>SOLUTION: This impact rotary tool comprises an impact mechanism for applying a hammering impact to an output shaft by the output of a motor 1, a hammering detection part for detecting the hammering by the impact mechanism, and a control unit 10 for estimating a tightening torque according to the output of the hammering detection part and stopping the motor when the estimated tightening torque reaches a preset torque value. The hammering detection part comprises a plurality of sensors S1, S2 positioned at different distances from the impact mechanism in the housing 7. The control unit switches the plurality of sensors for detecting the hammering. Even if the vibration transmission properties of the housing are varied, the hammering can be accurately detected using any sensor. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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