Patent ID: 7997164
Filing Date: 2011-08-16
Classification: B23P

Abstract:
1. A screw fastener comprising: 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 controller configured to control operations of the screwdriver and the movement unit so as to pick up the screw from the container and to fix a part onto the work with the screw; and an optical sensor provided to the sleeve and configured to detect the recess of the screw while a bottom surface of the sleeve and a top surface of the screw are arranged in a noncontact manner, wherein the controller aligns the tip of the bit with the recess of the screw based on a detection result of the optical sensor.