JPH0152184B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an inking and dampening device for a rotary offset printing press, which ink film and/or ink film on the rollers of the inking device and/or dampening device.
It relates to a type having a device for physically influencing the surface of the dampening water film.

In offset rotary printing presses, excess dampening water often causes so-called ink-fountain water-emulsion agglomerates to form in the inking unit. Therefore, maintaining a predetermined ink-dampening water balance is an important condition for high-quality printing.
From German Patent Application No. 2 328 953, an inking and dampening device is known which has at least one kneading roller for guiding the ink in the inking and dampening device. In order to improve the ink division between the ink guide rollers of the device, hard brushes are arranged, for example, on the kneading rollers. According to the above-mentioned measures, the ink-water film on the mixing roller or rollers is broken up using correspondingly stiff bristles, resulting in a more uniform coating than would be possible using a lidar roller or a Morton-covered storage roller. It is possible to perform a division. However, the brushes used to break up the ink film often receive different amounts of ink;
This method has disadvantages in that the brush may become submerged in ink, and the ink may form a scab on the bristles of the brush, causing it to dry out. The above-mentioned drawbacks, for example, make uniform ink distribution difficult through each subsequent kneading station.

The object of the invention is to provide an ink and dampening solution in which a physical treatment of the surface of the ink-dampening water film is possible without the risk of scabbing or over-drying on the equipment processing this surface. To provide a dampening device.

This problem was solved according to the invention by means of the features specified in claim 1. Advantageous embodiments of the invention are defined in the claims 2 to 9.

The deformation or bursting of the ink film and/or ink-dampening water film due to the vibrations produced using a mechanical vibrator device or an ultrasonic source releases the moisture contained in the ink and removes the water content. is subsequently dried, for example in a drying device according to German Utility Model No. 1904531. Compared to using a brush to break up the ink film, the use of a vibration generator, such as a vibrator or an ultrasonic source, requires less maintenance of the device and provides a continuous and uniform impact on the ink film. It has the advantage that it is possible to split the ink film radially and tangentially. The formation of so-called ink-dampening solution-emulsion agglomerates is thus prevented and the uniformity of the ink during each subsequent kneading station is promoted. This results in optimal ink circulation.

The invention will now be explained with reference to the illustrated embodiments.

1, 2 and 3 each schematically show an ink and dampening system associated with a form cylinder 1. In FIG. This ink and dampening system consists of inking rollers 2, 3, 4. Inking rollers 3 and 4
is supplied with ink from an ink fountain 12 via an inking roller 5, an intermediate roller 6, a further inking roller 7, an intermediate roller 8, an ink receiving roller 9 and an ink fountain roller 11. A conventional ink metering doctor 10 is shown above the ink receiving roller 9.

An ink activation device consisting of a vibrator 18 is shown in FIGS. 1 and 1a. The vibrations generated by the vibrator 18 are transmitted via a vibration transmission member 19, for example a spring, to a vibrating plate 20, which in turn transmits the vibrations to the ink film on the surface of the inking roller 5. As a result, this ink film is deformed or torn apart. FIG. 1a shows the ink mixing roller 5.
Two ink activation devices are shown which can be adjusted laterally in the axial direction of the ink activation device, by means of which the end area of the inking roller surface can be influenced. A dampening device roller 17 is connected to a dampening fountain 16 via a further dampening device roller 15
An ink-water-emulsion film is formed on top as a result of ink residue due to the splitting. In order to rupture this film, it is possible to also equip the dampening device roller 17 with one or more ink activation devices similar to the device provided on the inking roller 5.

2 and 2a show a variant of the ink activation device, in which the ink film on the inking roller 5 is deformed or torn by a roller 24, which is connected to a vibration transmitting member 25. , for example via a spring at least one vibrator 2
6, and this vibrator 26 is fixed to the immovable side wall 22 via a holding member 27.

As can be seen in Figure 2a, rollers or rolling elements 2
4 are attached to the side walls 22 and 23 by means of the same type of device. The roller 24 extends over almost the entire length of the inking roller 5, so that the entire ink film on the inking roller 5 is torn apart. It is clear that the ink activation device shown in FIGS. 2 and 2a can also be installed on other rollers of inking and dampening devices.

FIG. 3 schematically shows an ultrasonic source 28 instead of the vibrator shown in FIGS. 1-1a and 2-2a. The ultrasound source 28 may be structurally configured to extend the entire length of the roller. Another possibility is to arrange a number of ultrasound sources side by side in the axial direction of the roller. Also, the ultrasonic source 28 shown in FIG. 3 adjacent to the inking roller 5 can be used with other rollers of the inking and dampening devices.

In principle, the ink activation device according to the invention can be applied to all rollers or cylinders.

[Brief explanation of drawings]

The drawings show a plurality of embodiments of the invention, in which FIGS. 1 and 1a show an inking device activating device according to the invention, and FIGS. 2 and 2a show a second embodiment of the inking device activating device. , FIG. 3 shows a third embodiment. 1... Plate cylinder, 2, 3, 4... Inking roller, 5,
7... Ink mixing roller, 6, 8, 13, 14...
...Intermediate roller, 9...Ink receiving roller, 10
... Ink metering doctor, 11 ... Ink dispenser roller, 12 ... Ink fountain, 15, 17 ... Dampening device roller, 18, 26 ... Vibrator, 16 ...
...Moistening pot, 19, 25...Vibration transmission member, 2
0...Plate, 21...Holding rail, 22,2
3... Side wall, 24... Roller, 27... Holding member, 28... Ultrasonic source.

Claims (1)

[Scope of Claims] 1. An ink and dampening device for a rotary offset printing press, wherein the ink film and/or the ink-dampening water film on the roller of the inking device and/or the dampening device are Types with devices for physical influence, characterized in that the surface of the ink film and/or ink-dampening water film is deformed and/or ruptured by the vibrations. An ink and dampening device for a rotary offset printing press. 2. Inking and dampening device according to claim 1, in which mechanical vibrator devices 18, 19, 20 are used to generate vibrations. 3. The inking and dampening device according to claim 2, wherein a plurality of vibrator devices 18, 19, 20 are arranged side by side in the axial direction of the rollers 5, 17. 4. Inking and dampening device according to claim 2, wherein the vibrator devices 18, 19, 20 each have one plate 20 that can be vibrated. 5. Inking and dampening device according to claim 2, wherein the vibrator devices 24, 25, 26, 27 each have one roller 24 that can be vibrated. 6. The inking and dampening device of claim 1, wherein an ultrasonic source 28 is used to generate the vibrations. 7. Claim 6, wherein a plurality of ultrasound sources 28 are arranged side by side in the axial direction of the roller 5.
Ink and dampening equipment as described in Section. 8 one or more vibrator devices 18,1
24. The inking and dampening device according to claim 1, wherein the inking rollers 9, 20; 24, 25, 26, 27; 28 are arranged on one inking roller (5). 9 one or more vibrator devices 18,1
3. Ink and dampening device according to claim 1, characterized in that 9, 20; 24, 25, 26, 27; 28 are arranged on one dampening device roller 17.