Multicolor sheet-fed printing press

Details Multicolor sheet-fed printing press Multicolor sheet-fed printing press

1976-05-26

1977-04-05

Fisher, J. Reed

Printing

Multicolor

Rotary machines

101230, B41F 706

Patent

active

040155226

ABSTRACT:
A sheet-fed printing press installation comprised of a first press unit for printing on one side of a sheet and which is coupled by a chain type conveyor to a second press unit in which there is a transfer drum having a normal set of grippers and an auxiliary set of grippers for (a) additional printing on the same side of the sheet or (b) printing on the opposite side of the sheet. The conveyor has an inlet sprocket for taking of the sheet from the impression cylinder in the first press unit and an outlet sprocket for delivering the sheet to the impression cylinder in the second press unit. First and second transfer drums are interposed in series between the outlet sprocket and the impression cylinder of the second press unit, the first transfer drum having the normal and auxiliary set of grippers. When the auxiliary set of grippers is activated, the sheet is gripped at the trailing edge thereby to reverse the sheet for printing on the second side of the sheet in the second press unit. The sprocket chain is driven at a speed which is less than the peripheral speed of the first transfer drum so that the auxiliary set of grippers may remove the sheet more promptly from the conveyor and sprocket drum to avoid smearing of the printed side of the sheet. A vacuum type sprocket drum preserves accurate register of the sheet for gripping purposes and stationary vacuum plenums are provided for removing the sheet from the influence of the drum just prior to transfer from the conveyor to the first transfer cylinder.

REFERENCES:
patent: 2702002 (1955-02-01), Koch
patent: 2757610 (1956-08-01), Gegenheimer et al.
patent: 3158092 (1964-11-01), Barthel
patent: 3537391 (1970-11-01), Mowry
patent: 3742847 (1973-07-01), Zimmermann et al.
patent: 3796154 (1974-03-01), Weisgerber

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