| 摘要 |
An object of the present invention is to provide an electric screwdriver device having a function for determining that a correct tightening operation has been carried out when the tightening operation has taken a time longer than a reference time predetermined for the tightening operation, characterized in comprising a novel means for determining the reference time. The electric screwdriver device of the present invention comprises a torque monitoring means ( 40 , S 4 ) for monitoring whether or not a load torque in carrying out the tightening by using the electric screwdriver 12 has reached the tightening completion torque, a timer means ( 40 , S 1 , S 5 ) for measuring the time consumed from the starting of the tightening operation until the tightening torque has reached the tightening completion torque, as the tightening operation time, and a means ( 40 , S 6 -S 10 ) for determining the reference time for a subsequent tightening operation based on a plurality of tightening operation time obtained from the timer means in the tightening operations carried out for the predetermined number of screws.
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