| 摘要 |
PURPOSE:To make cross operating control easier than ever before, by making up a swing device so as to keep a stationary state to the cross direction instead of necessitating any special compensation motion in time of swing motion in the swing device. CONSTITUTION:When a bevel pinion 12 for cross shifting use is rotated via a driving shaft 13, an upper pulley 14 or a first rotor rotates clockwise. With this rotation, a connector 18 situated at the side of a front sheave 16 serving as a third rotor is rolled round by a lower pulley 15 or a second rotor, and the connector 18 situated at the side of a rear sheave 17 or a fourth rotor is drawn out toward the rear sheave 17. Therefore, the front sheave 16 shifts toward each of these pulleys 14 and 15 whereby a welding torch 23 retreats. When the driving shaft 13 is rotated in the reverse direction, the rear sheave 17 shifts toward these pulleys 14 and 15 so that the welding torch 23 moves forward. |
