| 摘要 |
PROBLEM TO BE SOLVED: To reduce the manufacturing cost and, at the same time, improve the maintenance of an electronic black board by a method wherein the number of its constitutional parts and its required assembling man-hours are reduced. SOLUTION: Brackets 20a and 20b are provided so as to project from the upper frame of a frame 19 to a front surface side. At the same time, brackets 20c and 20d are provided on the lower frame of the frame 19. A roller 2 is detachably supported by the brackets 20a and 20c and, at the same time, a roller 1 is detachably supported so as to span an endless sheet 3 between these rollers 1 and 2.
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