Vacuum transfer apparatus for rotary sheet-fed printing presses

Details Vacuum transfer apparatus for rotary sheet-fed printing presses Vacuum transfer apparatus for rotary sheet-fed printing presses

1990-12-18

1992-07-07

Burr, Edgar S.

Printing

Antismut device

Contact preventers

101231, 101232, 101217, 101492, 101480, 271276, 271277, 271194, B41F 1302

Patent

active

051273292

ABSTRACT:
A vacuum transfer apparatus for use in a sheet fed rotary printing press for supporting the unprinted side of a freshly printed sheet as it is moved from the press impression cylinder along a transfer path to a further processing station of the press, the apparatus including a vacuum chamber supporting a plurality of rotatable elongated rollers arrayed in spaced side-by-side parallel relationship laterally across the transfer path, and a vacuum pump connected to the chamber for producing a pressure differential across the freshly printed sheet to draw the unprinted side of the sheet into engagement with the support rollers by drawing air into the vacuum chamber through the spaces between the rollers as the sheet is pulled along the transfer path so that the printed side of the sheet can not be marked or marred.

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patent: 3076492 (1963-02-01), Monks
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patent: 4060235 (1977-11-01), Weikel, Jr.
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patent: 4479645 (1984-10-01), Pollich
patent: 4572071 (1986-02-01), Cappel et al.
patent: 4688784 (1987-08-01), Wirz
patent: 4722276 (1988-02-01), Tyler
patent: 5004221 (1991-04-01), Stark
patent: 5016060 (1991-05-01), Arai

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