| 摘要 |
A screw fastener includes a screwdriver that includes a sleeve having an absorption hole configured to absorb a top surface of a screw, a bit housed in the absorption hole and having a tip engageable with a recess of the screw, and a rotation unit configured to rotate the bit with the sleeve, a movement unit configured to move the screwdriver between a container configured to accommodate the screw and a work, a positional shift detector configured to detect a positional shift on a plane between a center axis of the screw perpendicular to the plane and a center axis of the bit perpendicular to the plane, and a controller controls a movement of the movement unit so as to reduce the positional shift, based on a detection result of the positional shift detector.
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