Dampening apparatus for offset printing

Details Dampening apparatus for offset printing Dampening apparatus for offset printing

1975-07-07

1977-05-10

Coughenour, Clyde I.

Printing

Planographic

Dampeners

29132, 101451, B41L 2502

Patent

active

040221253

ABSTRACT:
The dampening system incorporates a fountain roller that removes a quantity of dampening liquid from a reservoir and transfers a portion of the liquid to a ductor roller composed of a soft material such as synthetic rubber and having a smooth outer surface is supported by the framework of the machine and is intermittently moved laterally into engagement with the fountain roller in order to extract a quantity of dampening liquid from the fountain roller. A rider roller composed of hard non-metallic material, such as polyurathane or other suitable plastic material, is intermittently engaged by the ductor roller to transfer a quantity of the dampening liquid from the ductor roller to the rider roller. The rider roller is provided with a smooth cylindrical outer surface. A dampening form roller, composed of a soft material such as synthetic rubber, is disposed in engagement with the rider roller and with the photographic printing plate carried by the plate cylinder of the machine and is operative to transfer a measured quantity of the dampening liquid from the rider roller to the photographic printing plate to prepare the printing plate to accept ink only in those portions that are specifically prepared to receive it.

REFERENCES:
patent: 2102641 (1937-12-01), Osborne
patent: 2119491 (1938-05-01), Rapport
patent: 2309729 (1943-02-01), Gordon
patent: 2530282 (1950-11-01), Brodie et al.
patent: 3002866 (1961-10-01), Gartrell et al.
patent: 3007403 (1961-11-01), Barnes
patent: 3094065 (1963-06-01), Roberts
patent: 3254515 (1966-06-01), Schiffer
patent: 3594255 (1971-07-01), Budinger
patent: 3688694 (1972-09-01), Preuss et al.
patent: 3902417 (1975-09-01), Fischer

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