To make it possible to shorten a bake treatment time and enhance treatment effect by providing a roller member which holds the clearance between a hot board and the top of a hot plate definitely on the top of the hot plate which heats the hard board which is conveyed by a roller conveying means from below.
A conveying roller 50 conveys a glass board 52 in the definite direction at a definite speed in rolling contact with the bottom on both-sided edges of the glass board 52. A hot plate 56 is provided between the conveying rollers on both sides where a roller member 64 is turnably mounted in a recessed part 62 on the top of a thick plate 58 of the hot plate 56. The roller member 64 has a disk 64A and a shaft 64B which penetrates through the center of the disk 64A. The lower part of the disk 64A is placed into a semi-disk-shaped recessed part 62A of the thick plate 58 and the shaft 64B is placed on a small- sized recessed part 62B so that it may be loaded. As a result, the roller member 64 is turnable with the shaft 64 engaged with the small-sized recessed part 62B. This construction makes it possible to hold the clearance between the glass board 53 and the hot plate 56 definitely.
YAO YASUYOSHI
EMOTO TATSUYA
OZAKI MASAFUMI
OTSU MASAO
FUJIKURA TOSHIYUKI