| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw fastening screwdriver unit preventing force in a loosening direction from acting on a screw by the reaction due to the torsion of a transmission shaft transmitting the drive of a rotational driving source to a driver bit. SOLUTION: The screw fastening screwdriver unit 1 includes: a rotation driving means 12; the transmission shaft 15 integrally rotatably connected to a drive shaft 12a of the rotation driving means 12 and having a screw fastening tool 17 engageable with the head of a screw at its tip; a torque sensor 16 detecting the torsion of the transmission shaft 15 over the whole of screw fastening work; and a control unit 20 accumulating the detected data by the torque sensor 16, determining damped vibration caused by the twisted transmission shaft 15 based on the accumulated data, and giving a gradual decrease command signal calculated on the basis of the determined result to the rotation drive means 12 after reaching the target of screw fastening torque to gradually decrease the rotation of the transmission shaft 15. COPYRIGHT: (C)2010,JPO&INPIT
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