| 摘要 |
A pair of elongate holding devices (7a, 7c) extending along opposite sides of an imaginary rectangle have respective longitudinal recesses (12, 21) which hold respective edge portions (6a, 6c) of a poster (6). One holding device (7c) has a fixed bearing member (16) and a movable member (18) which contains the recess (21) and which is pivotable about a pivot axis (19) from an active position, in which the recess (21) is open in a direction away from the opposite holding device so that the poster (6) turns back on itself near the edge portion (6c), the poster being under tension between the pair of holding devices, to a passive position, in which tension in the poster is released sufficiently to allow the edge portion (6c) to be removed from the recess (21).
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