JPS604060A - Method and device for simultaneously executing dampening andinking of plate cylinder in offset printing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides matrix dampening and ink application in offset printing. The present invention relates to a method and apparatus for simultaneously achieving the most efficient Fl balance between the ink and the dampening bath liquid.

As is well known, achieving a balance between the ink and the dampening bath liquid means that the non-printing areas (non-image + This is extremely important in order to prevent ink from adhering to the edges. However, at the molecular level between the ink and water or dampening solution,
) creates an attractive force or a repulsive force, which destabilizes the balance of the lever.
If the amounts of the two components are not properly adjusted and are left in an adverse condition, it can be detrimental to obtaining good prints.

Conventional devices usually attempt to supply a uniform amount of water without regard to the fundamental stabilization of the thermodynamic equilibrium between the ink and the dampening bath liquid. Devices of this type are mostly based on the idea of transferring ink and water to a matrix TFCUii ink roller. However, practical printing tests have shown that even if a uniform and consistent film of ink or water is initially applied or transferred, various defects may occur later.7
? -0 The purpose of the present invention is to improve the accuracy of regulating wet liquid and
Since satisfactory inking depends on the positioning of the inking rollers and the concomitant application of the ink, it is an object of the present invention to provide a method and a device for influencing the amount of ink so that pre-emulsification can be carried out in a vibrating mechanism.

The present invention will now be described in detail by way of non-limiting embodiments with reference to the accompanying drawings.

First of all, referring to FIG. 1 of the accompanying drawings, as shown, there is provided a plate cylinder designated by the symbol A, and a mechanism consisting of an ink roller and a vibrating roller, generally designated by the symbol B.

In the present invention, two novel one-ink rollers 5 and 6 are provided which are in contact with the plate cylinder A via an intermediate vibrating roller 13i which is in contact with an ink transfer vibrating mechanism B.

Symbols l, 2 and 3 indicate the conventional mechanism of the ink transfer vibration mechanism, together with the upper roller of the vibration mechanism B.
In the following, the part indicated by the reference numeral B in FIG. 1 will not be included. As shown in FIG. 1, a further vibrating roller 12 is provided which is in contact with the transfer roller 7 and in contact with the inking rollers 5 and 6. The transfer roller 7 can be moved towards and away from the two feed rollers 8 and the metering or regulating roller 9, the stages of this movement being illustrated in FIGS. 4 to 6. These figures also show the stages of contact and separation of the transfer roller 7 with respect to the rollers 8 and 9, as well as the stages of contact and separation of the rollers 5 and 6 with respect to the rollers, that is, the plate cylinder A. 9 is immersed in a reservoir or container indicated by the general numeral 14, which is divided into two parts, respectively indicated by the numerals 14A and 14B. This is to keep the amount of dampening bath liquid and alcohol at constant values. The portion designated by numeral 14A contains the minimum amount of dampening solution to prevent the alcohol contained therein from evaporating, and the portion designated by numeral 14B is used to collect the excess number of baths and use a mixer (not shown). This is so that it can be sent to other locations and reused.

Since the metering or conditioning roller 9 is not rotationally aligned with the metering roller 8, it will deliver excess solution to the portion 14B of the container 14.

It is of course possible to use suitable technical measures regarding the use of materials, for example, the surface of the roller 9 is made of a relatively hard material such as steel and coated in an elastic manner, and the roller 9 is coated in an elastic manner. The entire surface of the roller 8 can be made of a textured, non-elastic material (chromium is preferred from the viewpoint of hydrophilicity). It is clear from the above description that the method according to the invention as well as the operation of the apparatus according to the invention However, in the method and apparatus according to the invention, the dampening solution is not supplied to the inking mechanism during the pre-inking operation, and only the two inking rollers 5 and 6 are injected with the ink-water-alcohol compound. The dampening solution is thus emulsified with the ink and very suitable conditions are obtained in which the printing process can be started without waste or waste paper. Figure 5 shows the printing stage ( The following is an illustration of the apparatus used in step 2). The ink rollers are all in contact with the first plate cylinder A, and the ink-water-alcohol compound stabilized by the previous horizontal digging is applied to the cylinder. For this reason, both the ink and the dampening solution are transferred to the printing and non-printing areas of the plate cylinder at the same time, so there is no need to perform the dampening process first and then the inking process. nothing.

FIG. 6 shows the stop stage (third stage).

Ink rollers 1, 2, 3, 4.5 and 6 are all on plate cylinder A
At the same time, the transfer roller 7 is separated from the metering roller 8. In this stage of operation, rollers 8 and 9 continue to rotate to maintain a constant solution film.

The rollers of the dampening mechanism are driven by a properly controlled variable speed prime mover (
(not shown). Specifically, since the driving force is transmitted to the roller 8, the roller 9, which acts as an adjustment mechanism, is not directly subjected to transmitted vibrations that would affect the adjustment VC of the solution film thickness.

One thing to note is that this dampening mechanism automatically accelerates the startup speed and replenishes the NFC ink stored in the ink mechanism with a large amount of water and alcohol.

2 will be explained in conjunction with FIGS. 5 and 6. Since the ink roller in the present invention supplies or applies ink in an amount of approximately 12%, the ink supply by the fifth ink roller 4 is reduced to 42%. It has been reduced by 30%. Therefore, the supply of ink solution becomes more uniform, and there is no significant change in the amount of ink applied to the plate at 1%.

It goes without saying that the present invention is not limited to the embodiments shown in the figures or described above, or even to the embodiments shown and described above, but includes all modifications and equivalent forms based on the basic principles of the invention.

[Brief explanation of the drawing]

4 □ 工, □, yo. Wow. a. , 1 Figure 2 is a graph showing the compound application percentage, Figure 3 is a schematic diagram for comparison with the conventional technology, and Figures 4, 5, and 6 are graphs showing the compound application percentage. and FIG. 6 is a schematic diagram showing each operation stage of the inking device. A... Plate cylinder, B... Ink deposition mechanism consisting of rollers and vibrating rollers, 5, 6... Ink roller, 7...
Transfer rollers, 8, 9... Measuring supply rollers, 12...
Vibrating roller, 13... Intermediate vibrating roller, 14... Container.

Claims (3)

[Claims] (1) Using two ink rollers, the ink-water-alcohol compound is transferred to the plate cylinder by bringing them into contact with the intermediate vibrating roller, and during the pre-wetting process, the ink mechanism is filled with solution. supplying the surface of the intermediate roller with a dampening solution from a container, the container being provided with a metering roller and a regulating metering roller of a different speed than the metering roller;
A method for dampening and inking a plate cylinder for offset printing, in which the metering roller is driven while the adjusting metering roller is controlled by a control device without vibration, and the plate cylinder is dampened and inked simultaneously. (2) The method of claim i1, wherein the metering roller is provided with a variable speed. (3) Equipped with a plate cylinder, an ink roller and a vibrating roller.
In offset printing, the plate cylinder is dampened and inked using two oTikl + ink rollers that come into contact with the plate cylinder.
An intermediate vibrating roller in contact with the vibrating roller and a vibrating roller placed between the two inking rollers divide the dampening bath liquid into two parts so as to keep the volume and alcohol percentage constant. A7'C has a dampening solution supplied to the surface from a 'n71c container, and a total of 11-g A7'C
A metering roller and a metering roller are attached to the container for supplying dampening solution to a transfer roller in contact with the intermediate roller.
equipment that is used. -(4) A driving mechanism for the roller of the container is provided which applies a driving force to the metering and supplying roller while biasing the metering roller with respect to the metering and supplying roller. The device described in.