| 摘要 |
<p>A cylindrical segment having a longitudinal axis has a helical edge which serves as a static flap folding edge for a carton in translatory motion with respect to the cylindrical segment. The cylindrical segment is reciprocally rotatable about an axis such that when the cylindrical segment rotates the helical edge progressively engages and folds a flap of a carton disposed at the helical edge.</p> |
