| 摘要 |
<p>It is an object of the invention to provide an effective technique for avoiding the influence of reaction during tightening operation in the rotary fastening tool. Representative rotary fastening tool includes a tool body (101), a motor (111) housed within the tool body, a driving-side rotating member (121) that is rotationally driven by the motor, a driven-side rotating member (123) that is disposed coaxially with the driving-side rotating member, a tip-end side rotating member that is disposed coaxially with the driven-side rotating member (140) and rotationally driven via the driven-side rotating member, the tip-end side rotating member driving a tool bit to perform a tightening operation and a rotation control mechanism that allows the tip-end side rotating member to rotate in the tightening direction during the tightening operation of the tool bit, wherein, when the tip-end side rotating member is fixed to a workpiece with the tool bit during the tightening operation and when torque transmission from the driving-side rotating member to the driven-side rotating member is interrupted, the rotation control mechanism (150) locks the tip-end side rotating member (140) and the tool body (101) together against rotation with respect to each other to prevent the tool body from rotating in the tightening direction.</p> |
