| 摘要 |
PURPOSE:To perform a screw tightening work surely by a method wherein the automatic centering device is provided with a self-centripetal effect by a three- dimensional floating mechanism and the taper part of a guide tube to correct a relative position automatically even when there is a variation in the accuracy of the relative position. CONSTITUTION:A screw driver unit 3 is equipped with the guide tube 21 and is arranged with a tightening tool 22 while the tip end of the tube 21 is formed into a taper expanded at the end thereof to facilitate positioning with respect to an adjustor screw 4a. Even when there exist variations of X, Y, Z axial directios in a screw 4a with respect to the unit 3, the self-centripetal effect is effected by the sliding contact of the screw 4a with the taper part 23 of a head H and the posture of the screw is changed by floating the unit 3 into X, Y, Z axial directions. When the unit 3 has arrived at a predetermined position and the aligning as well as the positioning thereof with respect to the screw 4a are finished, the adjustment of an optical axis is effected. |
