JPH051401Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ink supply device for a rotogravure printing press.

[Prior art]

In rotogravure printing presses, methods for supplying ink to the plate cylinder include a direct dipping method, a finesse roller method, and an applicator method (or cascade method).

In the direct immersion method, as shown in FIG. 2, the lower end of the plate cylinder 3 is directly immersed in the ink 2 in the ink pan 1, and the ink 2 is supplied to the plate cylinder 3. Note that 4 is a doctor device for scraping off the ink 2 attached to the plate cylinder 3 and making it uniform in thickness. 5 is plate cylinder 3
Impression cylinder corresponding to. 6 is a substrate to be printed.

Such a direct dipping method is relatively good in terms of doctor unevenness (uniformity of the thickness of the ink 2 attached to the plate cylinder).

As shown in FIG. 3, in the fannisher roller system, a fannisher roller 7 is immersed in ink 2 in an ink pan 1, and the ink 2 is transferred from the fannisher roller 7 to the plate cylinder 3. . Note that since the other parts are the same as in FIG. 1, they are indicated by the same reference numerals.

In such a finer roller system, the transfer of the ink 2 to the plate cylinder 3 is reliable, and moreover, the ink 2 does not fall off from the plate cylinder 3.

In the applicator method, as shown in FIG. 4, the ink 2 in the ink tank 8 is pumped up by a pump 9 and introduced into the applicator 11 through a filter 10.
The ink 2 flowing out from the applicator 11 is transferred to the plate cylinder 3.
It was designed to be hung on the . Note that 12 is an ink pan for collecting the ink 2. Others are
Since it is the same as in FIG. 1, it is shown with the same reference numeral.

Such an applicator method is characterized by small doctor unevenness.

[Problem that the invention attempts to solve]

However, in the direct immersion method, since the surface of the ink 2 in the ink pan 1 is exposed to air, the surface of the ink 2 dries, making it difficult for the ink 2 to transfer to the plate cylinder 3. Another disadvantage is that the ink 2 is difficult to penetrate into the thin parts of the plate.

Further, the finer roller method has the disadvantage that paper powder generated during printing or dust in the air is mixed into the ink 2, which tends to cause doctor unevenness.

Further, in the applicator method, since the ink 2 is simply applied to the plate cylinder 3, the ink 2 is difficult to get acquainted with the plate cylinder 3, and there is a drawback that ink 2 easily falls off from the plate cylinder.

An object of the present invention is to provide an ink supply device for a rotogravure printing press that combines the advantages of the above-mentioned systems and enables high-speed printing.

[Means for solving problems]

The structure of the present invention to achieve the above purpose is as follows:
This will be explained using FIG. 1 which corresponds to an embodiment.

In the present invention, a fannisher roller 7 is immersed in an ink pan 1 that is supplied with ink 2 so that the ink 2 always overflows from an ink tank 8, and the lower end of the plate cylinder 3 is brought into contact with the fannisher roll 7. The part is immersed in ink 2.

[Effect]

With the above-described configuration, the present invention supplies the ink 2 to the plate cylinder 3 in the same way as in the direct dipping method, and further,
Since the ink 2 is pressed against the plate cylinder 3 by the polisher roller 7, there is no occurrence of ink dropping or ink transfer failure. Furthermore, since the ink 2 that has passed through the filter 10 always overflows inside the ink pan 1, there are no problems such as drying or contamination of the surface of the ink 2, and doctor unevenness can be reduced.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows an embodiment of the present invention.

In the figures, the same parts as in FIGS. 2 to 4 are designated by the same reference numerals.

With the above configuration, the ink 2 in the ink tank 8 is pumped up by the pump 9 and supplied to the ink pan 1 through the filter 10. The ink 2 that has soaked the fine print roller 7 and the plate cylinder 8 in the ink pan 1 overflows from the ink pan 1, is collected in the ink pan 12, and then returned to the ink tine 8.

On the other hand, by rotating the plate cylinder 3, the fancier roller 7 is also rotated. Therefore, plate cylinder 3
In this case, the ink 2 deposited by dipping is pressed by the polisher roller 7, so that the ink 2 can be reliably supplied to the plate surface. Furthermore, since the ink 2 is always supplied to the ink pan 1 after passing through the filter 10, there is very little paper powder or dust mixed in, so that doctor unevenness can be reduced.

[Effect of idea]

As described above, according to the present invention, the advantages of each conventional ink supply system can be realized and the drawbacks can be compensated for, and ink can be reliably supplied to the plate cylinder even during high-speed printing.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of the ink supply device of the present invention, Fig. 2 is a block diagram of a direct immersion type ink supply device, and Fig. 3 is a block diagram of a finer roller type ink supply device. , FIG. 4 is a configuration diagram of an applicator type ink supply device. 1...Ink pan, 2...Ink, 3...Print cylinder, 7...Function roller, 8...Ink tank, 9...Pump, 10...Filter.

Claims (1)

[Scope of utility model registration request] An ink pan that rotatably supports a finesse roller inside and is arranged so that the finesse roller is in contact with the lower end of the plate cylinder. 1. An ink supply device for a rotogravure rotary printing press, characterized in that a supply means for supplying ink is provided.