| 摘要 |
A spiral zig-zag folding apparatus for folding a length of paper having longitudinally spaced, transversely oriented perforations includes a swing chute assembly having an upper chute pivotally mounted to a lower chute which guide the paper between opposed spiral folders for folding along adjacent perforations. The upper and lower chutes are driven by a single drive arm carried at one side of the apparatus frame by an eccentric cam which is adjustable to vary the stroke of the drive arm, and, in turn, the movement of the chutes. Each chute includes a pair of spaced blades formed with a foam core overwrapped with one or more layers of composite material.
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