| 摘要 |
Folding cylinders for handling the product of a printing press or the like in which a tucker blade in one of the cylinders engages the web, or associated webs, for tucking into an opposedly phased jaw or groove in the other cylinder, the blade being mounted in the blade cylinder for timed rocking movement about an axis which lies approximately on, or somewhat outside of, the rolling circle so that the blade, and particularly the edge thereof, moves into the jaw cylinder in a direction radially of the jaw cylinder. In a preferred embodiment of the invention the blade is guided in its rocking movement along arcuate track of slightly non-circular or oval contour so that the center of rocking movement is constantly varied in accordance with the angle of rocking, shifting outwardly of the rolling circle as the blade is rocked from neutral position.
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