| 摘要 |
PURPOSE:To prevent the dust formation due to the idle revolution of a bit by installing a chuck which releases a screw when the screw is screwed into a work at the second position set inside, in the state where the bit is inserted into the hole on a screw head part at the first position set outside a clean room, etc. CONSTITUTION:At the first position B set outside a clean room, the bit 30 of a nut runner head 24 is previously inserted into the hole at the head part of a screw 37 held by a screw positioning clamper 6, and said screw 37 is held by a chuck, and said screw 37 and the bit 30 are connected through the chuck. Then, the connected bit 30 and screw 37 are pulled out from the screw positioning clamper 6, and shifted to the second position C set inside the clean room, in the state where the bit 30 is perfectly inserted into the hole at the head part of the screw. At the position C, the screw 30 is inserted into a work, and then released from the chuck, and the screw 37 is fastened onto the work by the revolution of the bit 30, without forming the dusts due to the idle revolution of the bit 30.
|
