Vacuum transfer apparatus for rotary sheet-fed printing presses

Printing – Antismut device – Contact preventers

Patent

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Details

101183, 101231, 271194, B41F 500

Patent

active

051332558

ABSTRACT:
A vacuum assisted sheet transfer assembly has an array of support sections which support the unprinted side of a freshly printed sheet along a sheet transfer path. The support sections overlie the airflow inlet of a manifold housing, with the longitudinal axis of each support section extending across the sheet transfer path. The support sections provide smooth surfaces for engaging and supporting the unprinted side of the sheet material as it is pulled along the transfer path while simultaneously limitting the flow of inlet air through elongated inlet apertures. As air is drawn through the inlet apertures, the unprinted side of the sheet is sucked into engagement with the support sections as it moves along the sheet transfer path. The sheet transfer assembly eliminates the need for conventional skelton wheels and the like. Marking, smearing and smudging are prevented since the printed side of the sheet is not handled or contacted in any way as the sheet is conveyed along the sheet transfer path.

REFERENCES:
patent: 4572071 (1986-02-01), Cappel et al.
patent: 4997178 (1991-03-01), Ogoda
patent: 4998715 (1991-03-01), Milan et al.
patent: 5004221 (1991-04-01), Stark
patent: 5016060 (1991-05-01), Arai

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