PURPOSE: To quickly tighten the inside of works even if thicknesses of the works differ by providing right/left tilt stopping tools at the center position of an angle rest and providing contact tools and tightening tools at the right and left positions.

CONSTITUTION: After works 25, 26 hung and conveyed hit the right and left end faces of a center contacting plate 2, contact screws 16 are tightened inward respectively, then contact plates 17 press the works 25, 26 to the right and left end faces of the center contacting plate 2 and temporarily fix them. Next, after adequate heights are selected among different sizes of height adjusting beds 20 in response to the thicknesses of the works 25, 26, they are inserted into insertion holes 24, and stop screws 19 are inserted into stop plates 18. The stop screws 19 are tightened while the heights are adjusted by height adjusting screws 23, the outsides of the works 25, 26 are pressed hard. Furthermore, screws 5 are inserted into the right/left tilt stopping tools 3, the right and left stop curve faces are pressed on the inside surfaces of the works 25, 26, and the screws 5 are tightened to fix the works 25, 26.