| 摘要 |
A resistance spot welder includes: a motor 3, having a shaft 15; a cylindrical casing 7; a hollow guide rod 6, inserted into the casing, and adapted to be moved linearly for moving a first electrode tip E1 facing a second electrode tip E2 provided at a gun arm 8; a ball nut 5, fixed in an inner circumference of the guide rod; a ball screw 4, fitted through the ball nut; a coupling 12, including a first fastening portion 17 into which the shaft 15 of the motor is inserted and a second fastening portion 16 into which the ball screw 4 is inserted and which is opposite to the first fastening portion 17; and a bearing 19, fitted between an outer circumference of the first fastening portion 17 and an inner circumference of the casing 7. The guide rod 6 is movable between a first point which is a motor side and a second point which is an electrode tip side. When the guide rod 6 is positioned at the first point, the guide rod accommodates at least a part of the second fastening portion 16.
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