Fastening device

A fastening device comprising a stocker in which a plurality of fastening tools are accommodated, an unloading and supplying device configured to individually supply the fastening tools from the stocker to a receiving site, and a screw-rotating device configured to screw-rotate the fastening tools supplied to the receiving site,

• the fastening device further comprising a displacement device for use with the screw-rotating device, and configured to displace the screw-rotating device in directions to approach toward and separate away from the receiving site;
• wherein the stocker has an arcuate shape that is curved in a horizontal plane, and is configured to accommodate the fastening tools in a state of being aligned in a row;
• the unloading and supplying device supplies a fastening tool positioned at a most downstream side of the stocker to the receiving site;
• the screw-rotating device is displaced by the displacement device for use with the screw-rotating device toward the fastening tool that was supplied to the receiving site, and screw-rotates the fastening tool, whereas after screw-rotation is completed, the screw-rotating device is displaced by the displacement device for use with the screw-rotating device in a direction to separate away from the receiving site;
• and
• wherein, when the screw-rotating device retains the fastening tool after completion of screw-rotation, the unloading and supplying device retains the fastening device again.