DE7026346U - LEVERLESS ALCOHOLIC MOISTURIZER FOR OFFSET PRINTING MACHINES. - Google Patents

Description

Maschinenfabrik Augsburg-Nürnberg, Aktiengesellschaft 89 Augsburg, Stadtbachstrasse 1

Gm. B. 983 Augsburg, July 10, 1970

Lifterless alcohol dampening system for Oiiset printing machines

^m The innovation relates to a lifterless alcohol dampening system

- for offset printing machine !! with a distribution cylinder, two orders

rollers and another roller resting on the distribution cylinder.

} Both for sheet-fed offset printing machines and offset rotary

As is well known, printing machines must have the same level of dampening fluid-Ί

should be applied moderately to prevent color fluctuations.

An aggravating effect is that the amounts of moist liquid to be applied are usually very small and at . Moistening units working with lifters are applied at more or less long intervals.

It is therefore already known by means of an outflow pipe that is moved back and forth along the distribution cylinder, the wet liquid apply evenly to this (DBP 939 995). Apart from the fact that this device is not suitable for small amounts of dampened liquid is suitable, can therefore also be used because of

702634816.6.71

Do not avoid streaks of water due to the small number of friction points.

In the device known from U.S. Patent 2,408,449 the dampening liquid is sprayed onto a ductor roller resting on the distribution cylinder through an oscillating nozzle. However Here, too, uniform application of the dampening liquid to the plate is not guaranteed, on the one hand because of the fluctuations Movement of the nozzle and, on the other hand, because of the low level of rubability.

The task of the innovation is now to use as little as possible the required amount of moisturizing liquid with as little siphon as possible little effort due to a number of distribution and storage locations evenly on the disk under different operating conditions to be able to supply.

According to the innovation, this is achieved in an alcohol dampening system of the type mentioned in that the plate cylinder remote area between the first applicator roller in the running direction of the plate cylinder, which is from the plate cylinder is pivotable, and the adjacent distribution cylinder one against the outer surface of the application roller or optionally the distribution cylinder pivotable spray device is provided.

This measure makes it possible to use alcohol dampening systems, where the last applicator roller is a smooth roller without one Storage effect exerting a coating is formed, the wet liquid streak-free according to a number of distribution and storage

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place to be applied and thus an even print result to achieve.

In the drawing, exemplary embodiments of the innovation are shown.
Show it

Fig. 1 shows the dampening system schematically

the innovation,

Fig. 2 and 3 other versions of the dampening system.

On the PlattenzyUnder 1 one with a not shown The offset printing unit interacting with the blanket and impression cylinder, the color is applied in a known manner by a number of inking rollers 2 is applied while the ink-repellent surfaces of the plate are provided with dampening liquid by a dampening unit. In order to be able to apply even the smallest amounts of dampening liquid evenly distributed, dampening water has recently been used Alcohol also added for relaxation. The dampening system, which was previously usually equipped with covered form rollers 3, 4, experienced thereby a change as that in the direction of rotation of the plate cylinder 1 last applicator roller 3 for alcohol fireworks as smooth roller can be formed. By reducing the Trituration between the applicator roller 3 and distribution cylinder 5 as a result of the omission of the coating is the risk of a less uniform distribution of the wet liquid on the plate increases, especially if the wet liquid is applied to the distribution cylinder by means of a reciprocating lifter. To avoid this, is after

The innovation in the dampening system aimed at the largest possible number of distribution points and storage. aside from that the possibility of distributing the dampening liquid over the length of the friction cylinder should also be provided. To this" The purpose is in the area facing away from the plate cylinder 1 between the first in the running direction of the plate cylinder 1 Application roller 4 and the distribution cylinder 5 resting on it, one against the outer surface of the application roller 4 or optionally of the distribution cylinder 5 pivotable spray device 6 is provided. By arranging another coated roller in the running direction of the distribution cylinder 5 after the first applicator roller 4, a storage effect is created, so that only After several cylinder revolutions, the wet liquid is no longer sprayed on in streaks of water on the bare applicator roller 3 or the plate can affect.

In the case of smooth papers, as can be seen from FIG. 1, the first applicator roller 4, which also has a coating, is switched off from the plate cylinder 1 and only rests against the distribution cylinder. The pivotable spray device 6 is then directed against the outer surface of the application roller 4, so that the applied damp ^:>

liquid three Verreibstellen must pass the iridescent smooth distribution cylinder 5 and further boiled down to the roller ₇ can be stored, namely, the drawn direction of the arrow at the B erührungs place of the applicator roll 4 to the distribution cylinder 5, at the contact point of the roller 7 with the distribution cylinder 5 and at the point of contact between the applicator roller and the distribution cylinder 5.

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In the case of rough papers, on the other hand, * as shown in FIG. 2, the first Leave applicator roller 4 on the plate cylinder .. and use it as a wiping roller or dirt roller used. In this case, the sprayer pivoted by about 90 directed against the lateral surface of the distribution cylinder 5. Although this decreases the number of friction points, the memory and distribution effect through the roller 7 is still preserved.

If necessary, however, a distribution roller 8 can also be arranged in front of the roller 7 in the direction of rotation of the distribution cylinder 5 to increase the number of friction points. It is then expedient to press the spray device 6 against the distribution roller 8 to be addressed.

In order to even out the moisture film over the length of the distribution cylinder, the roller 7 is parallel to the distribution cylinder 5 pivotable so that their axes run in parallel planes at an acute angle, d. H. the roller ends are laterally offset towards the outside.

The spray device itself expediently consists of a nozzle having a number of nozzles and extending parallel to the distribution cylinder 5 Feed pipe, which is divided into zones along its length and connected to a hydraulic fluid container. the individual zones are preferably adjustable from the boom according to the distribution of the subject, so that the amount of dampening liquid is allocated to the distribution cylinder 5 already pre-dosed. Pure liquid or a liquid-air mixture can flow through it the spray device can be atomized. Since the continuous spraying of the moist liquid creates an excess of moist

If liquid were available, the fuel pump timer is opened for a short time only every second, third or fourth cylinder revolution by means of a corresponding valve control or the like, depending on the need. From the roller 7 which diet. ^v Plies: .gkeitsstoß fields can then be issued Feuchtflüseigkeit enough, ^ J ^ ^ IISE even layer ensures throughout the pressing during üb-ifven 'c EIT''··.

As a result of the measures taken after the innovation, apart from the mentioned avoidance of water streaks, caused by the interrupted supply of moist liquid, compared to the known Lifting dampening system also significantly reduces the effort by eliminating the dampening siphon, the dampening ductor and the stepless ductor switching.

Claims (1)

Expectations 1. Lifter loses alcohol dampening system for offset printing machines with a distribution cylinder, two applicator rollers and one further roller lying against the distribution cylinder, characterized in that in the plate cylinder (1) facing away Area between the first in the running direction of the plate cylinder applicator roller (4), which from The plate cylinder can be swiveled away and the adjacent distribution cylinder (5) has one against the outer surface of the applicator roller (4) or optionally the distribution cylinder (5) pivotable spray device (6) is provided. 2. alcohol dampening system according to claim 1, characterized in that the distribution cylinder (5) adjacent further Roller (7) as a reservoir roller is provided with a fabric cover and can be pivoted parallel to the distribution cylinder is. Alcohol dampening unit according to claim I _- characterized in that the last applicator roller (3) is designed as a naked roller. Alcohol dampening unit according to claim 1, characterized in that the spray device (6) consists of a number Nozzles, which are zoned with a hydraulic fluid • Λ I tr Mil ι ΠΙ > » 1 - »1 ItI ι r «· iii 1 t I Ϊ, 1 lit t 4 - Keitsbehält are connected and controllable. 5. Alcohol unit according to claim 1, characterized in that that in the area of action of the pivotable spray device (6) on the distribution cylinder (5) a distribution roller (8) is provided.