| 摘要 |
PURPOSE:To reduce the number of driven parts for welding a frame main body by a method wherein a slit extended along the axial direction is formed in the upper opening end part of a cylinder and a tapered centering plate inserted into the slit is fixed. CONSTITUTION:When a hydraulic cylinder 24 is driven, a pusher 22 is moved to the left in the figure and touches a frame main body 13. When the pusher 22 is further moved in the same direction, the frame main body 13 is pressed and moved in a cylinder 11 in the direction shown by an arrow X. At that time, the pusher 22 slides in the guide grooves in the cylinder 11 and the both end edges of the frame main body 13 are guided by a centering plate 19 and come close to each other behind the centering plate 19. Then, while the frame main body 13 is passing the part of the cylinder 11 where a long hole 21 is provided, the two end edges are welded by welding torches. With this constitution, the number of driven parts necessary for constituting a welding apparatus for welding the frame main body can be reduced.
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