(19)
(11) EP 0 345 716 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
19.12.1990 Bulletin 1990/51

(43) Date of publication A2:
13.12.1989 Bulletin 1989/50

(21) Application number: 89110183.4

(22) Date of filing: 06.06.1989
(51) International Patent Classification (IPC)4: B41F 7/26
(84) Designated Contracting States:
AT BE CH DE ES FR GB GR IT LI LU NL SE

(30) Priority: 06.06.1988 US 203351

(71) Applicant: VARN PRODUCTS COMPANY, INC.
Oakland, NJ 07436 (US)

(72) Inventor:
  • Alvarez, Michael A.
    Kinnelon New Jersey 07405 (US)

(74) Representative: Schmidt, Horst, Dr. 
H. Schmidt & B. Müller, Postfach 44 01 20
80750 München
80750 München (DE)


(56) References cited: : 
   
       


    (54) Dampening apparatus for lithographic press


    (57) A dampener for a lithographic press comprises a form roller (20b), a metering roller (22b), a reservoir of dampening solution lying above and between the form and metering rollers (20b,22b), and means for supplying solution to the reservoir. The amount of solution applied to the form roller (20b) can be controlled by adjusting the pressure between the form and metering rollers (20b,22b) without appreciably affecting the pressure between the form roller (20b) and the plate cylinder (10b). Excess moisture retained on the form roller (20b) and excess solution which collects between the plate cylinder (10b) and the form roller (20b) is continuously returned directly to the reservoir. The metering roller (22b) and the plate cylinder (10b) are driven by the press gear drive system, and the form roller (20b) is driven from frictional contact with the plate cylinder (10b) and the metering roller (22b), to aid in retrofitting the dampener to existing presses.







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