Tower printing system having multiple vertically stacked satelli

Details Tower printing system having multiple vertically stacked satelli Tower printing system having multiple vertically stacked satelli

1990-10-09

1993-01-19

Burr, Edgar S.

Printing

Multicolor

Rotary machines

101180, 101221, 101138, B41F 518

Patent

active

051798999

ABSTRACT:
Two satellite printing stations (2, 3) are located vertically above each other, and a web (22) is guided first about a common impression cylinder (13) of the lower printing station, then upwardly about a common impression cylinder (4) of the upper printing station (2). To prevent set-off of freshly printed ink in the lower printing station (3) on the common impression cylinder (4) of the upper printing station, blanket cylinders (6, 7, 10, 12) of the upper printing station (2) are so located that, respectively, two blanket cylinders (6, 7, 10, 12) of printing couples of the upper printing stations are in vertical alignment so that a tangent at the nip between these blanket cylinders will be in an essentially horizontal plane (31). The blanket cylinders are spaced from each other to leave a clearance gap, and an image maintenance device (30), for example a spray bar or rod, a washing apparatus or the like, is located in the clearance space to apply a film of liquid against the upper common impression cylinder (4 ) or to clean the upper impression cylinder (4), thereby avoiding set-off of freshly applied ink in the lower printing station (3) on the impression cylinder (4) of the upper printing station, or to periodically or continuously clean the common impression cylinder (4) of the upper printing station. Preferably, the web is guided about the lower printing station in form of a wide-open upstanding U, and guided about the upper printing station in form of a downwardly facing wide-open U to provide access to maintenance and service personnel to the respective printing stations between the leg portions of the web forming the U.

REFERENCES:
patent: 2050031 (1936-08-01), Wood
patent: 3416444 (1968-12-01), Cahn
patent: 3604350 (1971-09-01), Rosenstadt
patent: 3761001 (1973-09-01), Bolza-Schunemann et al.
patent: 4281595 (1981-08-01), Fujishiro
patent: 4393772 (1983-07-01), Burger
patent: 4401028 (1983-08-01), Kobler et al.
patent: 4577559 (1986-03-01), Burger
Textbook by Oskar Frei "Techniken, Systeme, Maschinen" (Technology, Systems and Machines), published by Polygraph publishers, 1979, pp. 9 and 10.

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