Printing – Planographic – Dampeners
Patent
1992-09-02
1994-08-30
Fisher, J. Reed
Printing
Planographic
Dampeners
101350, B41F 726, B41F 3100, B41L 2704
Patent
active
053417330
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a short inking system for an offset rotary printing press with a screen roller.
DESCRIPTION OF THE PRIOR ART
A short inking system and printing system for an offset web-fed rotary printing press has been made public through the article "Die Anilox-Druckeinheit von MAN-Roland" (The Anilox Printing Unit of MAN-Roland) in the journal "DEUTSCHER DRUCKER" (The German Printer), No. 52, Vol. 25, Dec. 14, 1989, pp. W28 to W29. The ink application roller, the printing, rubber, and counterpressure rollers are embodied as double circumference cylinders or rollers. They have the same effective diameter (=same diameter), i.e. their circumferential speeds when printing are the same. A screen roller conveys ink from a chambered doctor blade system to an ink application roller. The diameter of the screen roller is less than that of the ink application roller.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a short inking system with a screened ink application roller, plate and rubber cylinder, which all have the same circumference, for a web-fed rotary printing press, the dampening water consumption of which during the printing process is considerably reduced in comparison with the state of the art.
The advantages which can be achieved by means of the invention consist particularly in that the dampening water consumption during printing is reduced up to 50%. There is no scumming in spite of the small dampening water consumption. The printing ink is emulsified considerably less with dampening water, which results in a more brilliant printed image, particularly with multi-color printing.
BRIEF DESCRIPTION OF THE DRAWINGS
An exemplary embodiment of the invention is shown in the drawings and will be explained in detail below.
Shown are in:
FIG. 1 a schematic view of the short inking system of the invention,
FIG. 2 a second exemplary embodiment of the short inking system of the invention,
FIG. 3 a third exemplary embodiment of the short inking system of the invention,
FIG. 4 a fourth exemplary embodiment of the short inking system of the invention,
FIG. 5 a fifth exemplary embodiment of the short inking system of the invention.
DESCRIPTION OF PREFERRED EMBODIMENTS
In a known manner, an ink supply in the form of a chambered doctor blade 1, a screen roller 2, an ink application cylinder 3, a printing or forme cylinder 4, a first rubber blanket cylinder 5.1, and a second rubber blanket cylinder 5.2, are seated in lateral frames 12. The ink application cylinder 3, the printing cylinder 4, the rubber blanket cylinder 5.1, the rubber blanket cylinder 5.2, which also acts as counterpressure cylinder, have the same effective circumference or diameter. Preferably they are embodied as so-called double circumference cylinders or rollers. A dampening system, preferably a brush dampening system, which delivers an amount of dampening medium to the ink application cylinder 3 is disposed to the right of the ink application cylinder 3. The brush dampening system consists of a brush roller 8, a dampening medium box roller 9, a dampening friction cylinder 7 and a dampening medium application roller 6, which conveys the dampening medium to a printing cylinder 4. A paper web 15 is printed between the rubber blanket cylinders 5.1 and 5.2.
Two additional rollers 13 and 14 are seated in the lateral frames 12 or in a pivotable frame on the left side of the inking system which is opposite the dampening system. The pivotable frame is seated in such a way that it can put the roller 13 out of contact with the printing or forme cylinder 4. The rollers 13, 14 remain in contact with the ink application cylinder 3 when the roller 13, together with the ink application cylinder 3, is displaced from the printing cylinder 4. The ink application cylinder 3 and the roller 13 are together placed against or displaced from the printing cylinder 4.
The rollers 13, 14 rotate against each other under pressure, without individual drives. The roller 13 is provided with an oleophilic rubber c
REFERENCES:
patent: 3705451 (1972-12-01), Dahlgren
patent: 4584940 (1986-04-01), Germann et al.
patent: 4619198 (1986-10-01), Moll
patent: 4753165 (1988-06-01), Grosshauser
patent: 5003871 (1991-04-01), Franz et al.
Deutscher Drucker; No. 25, Dec. 14, 1989; Ostfildern "Die Annilox-Druckeinheit Von Man Roland".
Albert Frankenthal Aktiengesellschaft
Fisher J. Reed
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