| 摘要 |
PROBLEM TO BE SOLVED: To provide a supporting plate fixing structure which prevents the protrusion of a supporting plate from the circumference of a PR plate even if the plate is formed to a plane shape. SOLUTION: This supporting plate fixing structure is constituted by mounting the supporting plate 2 and a bridge plate 3 to the rear surface of the PR plate 1, cutting a U-shaped notch 4 of an angular U shape at the supporting plate 2, forming the inner side of the U-shaped notch 4 as a tongue piece 5 and the outer side as a U-shaped edge 6, forming the lower tapering point in the lower part at the side edge of the U-shaped edge 6 as a tapering edge 7, opening a spacing band 8 at the bottom end of the U-shaped notch 4, forming a recess 10 at the base of an insert piece 9 formed at the front end of the bridge plate 3 and successively folding and raising the bridge plate 3 in such a manner that the insert piece 9 pushes and bends the tongue piece 5 and the recess 10 is caught by the tapering edge 7.
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