To make the repairing work of a panel easier by a method wherein a pair of cylinders, each of which tilts a main body by separately and vertically moving each shaft, and a stoppers, each tip of which can project beyond the upper end part of each roller by interlocking with the tilting of the main body near one of both end parts of the frame of the main body, are arranged.

At the connecting part 5a of a trestle 5, a pair of cylinders, which tilt a main body 1 by separately and vertically moving each shaft 4, are pivotally arranged opposite to each other. The tip of the cylinder pivotally journals each shaft 4. Next, two pairs of stoppers 10 are arranged inside near both the end parts of the frame 3. As for the driving part of the stopper, the arm at the tip part 12 of the stopper has a crank-like shape, the corner part fulcrum of which is pivotally supported to the connecting part 3a of the frame 3 and the lower end part of which is pivotally supported to a cylinder 11. The stopper 10 is actuated by interlocking with the tilting of the main body 1. When a panel is transferred onto the main body 1, both the cylinders 11 contract, resulting in uprighting the tip parts 12 and projecting beyond rollers 2 so as to realize a constitution, in which the panel does not move.