| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw member tightening tool which, as necessary, can bring backward a count value in association with reversely driving the screw member tightening tool.SOLUTION: A calculation unit of an electric driver transfers to a count return mode, when a down button (mode transfer operation part) is operated with the rotational direction of a bit holder set to a reverse rotation direction by a forward/reverse rotation switch. The calculation unit brings backward a count value to one backward value, when a driver bit is rotated in the reverse rotation direction in the count return mode. |
