| 摘要 |
A linkage for actuating a pair of suction cups that are located adjacent the other end of the guide rails and that can fold an upwardly inclined blank on the guide rails; the suctions cups being adapted to hold by suction two adjacent side panels of the blank, that are contiguous to the lower guide rail and on vertically opposite sides of the blank, and to rotate in opposite directions about the lower guide rail until the suction cups are 90 DEG apart, so that the two adjacent side panels are folded 90 DEG apart about the lower guide rail and thereby the blank is folded into a rectangular tube.
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