(19)
(11) EP 0 295 606 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.03.1989 Bulletin 1989/12

(43) Date of publication A2:
21.12.1988 Bulletin 1988/51

(21) Application number: 88109377.7

(22) Date of filing: 13.06.1988
(51) International Patent Classification (IPC)4: B41F 33/00, B41F 31/08
(84) Designated Contracting States:
DE FR GB

(30) Priority: 15.06.1987 JP 148373/87
25.08.1987 JP 211124/87
25.08.1987 JP 129073/87
29.08.1987 JP 132128/87

(71) Applicant: Dainippon Screen Mfg. Co., Ltd.
Kamikyo-ku Kyoto 602 (JP)

(72) Inventors:
  • Oda, Osamu c/o Dainippon Screen Mfg. Co., Ltd.
    Kuze Minami-ku Kyoto (JP)
  • Mizuta, Masaji c/o Dainippon Screen Mfg. Co., Ltd.
    Kuze Minami-ku Kyoto (JP)
  • Tsuchimoto, Shuji Dainippon Screen Mfg. Co., Ltd.
    Kuze Minami-ku Kyoto (JP)
  • Okuda, Hideharu Dainippon Screen Mfg. Co., Ltd.
    Kuze Minami-ku Kyoto (JP)
  • Nakajima, Masahiro Dainippon Screen Mfg. Co., Ltd.
    Kuze Minami-ku Kyoto (JP)
  • Sumi, Kenji c/o Dainippon Screen Mfg. Co., Ltd.
    Kuze Minami-ku Kyoto (JP)
  • Kadota, Tomoyuki Dainippon Screen Mfg. Co., Ltd.
    Kuze Minami-ku Kyoto (JP)

(74) Representative: Goddar, Heinz J., Dr. et al
FORRESTER & BOEHMERT Franz-Joseph-Strasse 38
80801 München
80801 München (DE)


(56) References cited: : 
   
       


    (54) An automatic ink feeding apparatus in an offset proof press machine


    (57) In an automatic ink feeding apparatus in an offset proof press machine, which feeding apparatus includes an ink feeding unit (32) including ink feeding part (62) movable along the axial direction of inking rollers (18, 20) for feeding ink (94) to the inking rollers (18, 20), a density measuring unit (24) measures a plurality of patches (40) for use in density control of printings impressed on a blank of an image (38) of a printing paper (6) by the proof press machine, and an operation means (28, 28a, 28b) makes a comparison of printing density (A, A′n, A˝n) of the patches (40) detected by the measuring means (24) with preset target density (B, Do, D′o) and finds data concerning required amounts of ink to be fed to predetermined axial positions of the inking rollers (18, 20) respectively corresponding to the patches (40) on the basis of the comparison, and a control unit (34) actuates the ink feeding means (32) to feed the amounts of ink (94) to the axial positions of the inking rollers (18, 20) on the basis of the data.







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