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

B - Operations, Transporting

41

F

B41F 13/02 (2006.01) B41F 21/10 (2006.01) B41F 22/00 (2006.01) B65H 29/24 (2006.01)

Patent

CA 2042342

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 means 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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