Printing – Inkers – Roller
Patent
1997-09-11
1999-11-09
Burr, Edgar
Printing
Inkers
Roller
1013505, 101363, 101207, B41F 3103, B41F 3120
Patent
active
059793198
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for feeding a high consistency fluid onto a rotating face, more specifically an ink feeder and an ink scraper most suitable for use in an offset rotary press.
2. Description of the Prior Art
An apparatus for feeding a high consistency fluid onto a rotating face comprises an ink feeder for feeding ink onto a printing plate.
FIG. 24 is a partial side view showing structure of one color part of an offset rotary press in the prior art which prints using a so-called keyless ink feeder. As shown in FIG. 24, there is provided an ink fountain roller 1 which is driven by a motor which is able to conduct speed control independent of a main body of the printing machine so as to rotate the roller 1 at a speed which is lower than that of the main body of the printing machine so that ink can be transferred. Ink of a constant film thickness is fed onto an outer circumferential surface of the ink fountain roller 1 from a portion of an ink feed blade 12 which is disposed along the axial direction (widthwise direction) of the ink fountain roller 1, or the cross machine direction. Also, there is maintained a gap of a predetermined distance between the ink feed blade 12 and the surface of the ink fountain roller 1 during printing.
In the prior art ink feed blade 12, as used in the keyless ink feeder for a high consistency fluid, there is no ink feed blade sectioned in the widthwise direction of the ink fountain roller 1. Color change in the widthwise direction of the ink fountain roller 1 thus cannot be effected.
So, an ink feed blade 12 in which a plurality of ink tanks 2 are provided in the widthwise direction of the ink fountain roller 1 so as to be sectioned to each feed ink uniformly in the widthwise direction onto the ink fountain roller 1 has been provided.
In FIG. 24, there is provided an ink transfer roller 3 which is driven to rotate at the same speed as that of the main body of the printing machine. The ink transfer roller 3 and the ink fountain roller 1 which is fed with ink are urged toward each other so that, while slippage between both rollers is being effected at a nip portion thereof, slip metering is taking place and the ink is transferred onto the ink transfer roller 3. Then, the ink is fed from the ink transfer roller 3 to a roller group 4 comprising a plurality of rollers and is further fed onto a printing plate 6 which is attached to an outer circumferential surface of a plate cylinder 45 via a form roller 5 in the roller group 4.
In the case of an offset printing, the printing plate 6 is also fed with damping water from a damping device 29 in addition to the ink fed as mentioned above.
The ink as fed onto the printing plate 6 via the ink fountain roller 1, the ink transfer roller 3 and the roller group 4 is fed with a constant film thickness in the cross machine direction. The ink is further transferred from the printing plate 6 to a blanket cylinder 46 so that printing is made on a paper running between the blanket cylinder 46 and another blanket cylinder 46 disposed opposingly thereto.
There is a portion where no printing is made, that is, a portion where no ink is fed onto the printing plate 6 from the form roller 5. Therefore, although the ink of a constant film thickness is fed, that ink is not consumed and the ink film thickness corresponding to that portion on the outer circumferential surfaces of the roller group 4, etc. becomes thicker.
So, a scraping doctor 8 is caused to abut on a doctor roller 7 disposed in the roller group 4. By use of this scraping doctor 8, the ink at the portion of the roller group 4 where the film thickness becomes thicker is scraped so that the ink is consumed uniformly in the entire widthwise direction of the roller group 4. Thus even if ink is fed constantly in the widthwise direction of the roller group 4, it is consumed with a good balance, and even though there occurs a differential ink consumption locally during the printing, a uniform ink film thickness is mainta
REFERENCES:
patent: 355590 (1887-02-01), Nakano et al.
patent: 1574474 (1926-02-01), Faltus
patent: 2161943 (1939-06-01), Baue
patent: 2837024 (1958-06-01), Dougan
patent: 3585932 (1971-06-01), Granger
patent: 3699888 (1972-10-01), Easoz
patent: 5205216 (1993-04-01), Okamura et al.
patent: 5709148 (1998-01-01), Uera et al.
Hamaoka Yukio
Mita Koji
Miyake Mitsunao
Oyama Yoshihiro
Burr Edgar
Colilla Daniel J.
Mitsubishi Jukogo Kabushiki Kaisha
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