JPH0539888Y2 - - Google Patents

Description

[Detailed description of the invention] a. Field of industrial application This invention uses lithography including offset printing and direct printing, and inter alia interposes a metering roll, such as a mesh roll, in the inking train. The present invention relates to a device for removing water that enters the return side circumferential surface of a mesh roll, that is, the circumferential surface after ink transfer, in a lithographic printing press.

b. Prior Art In a typical conventional lithographic printing machine, the amount of dampening water supplied to the plate cylinder is adjusted to the non-image areas that need it most, and the same amount is also applied to the image areas where it is not needed. Since water is supplied, surplus water has entered the ink supply system via the return side circumferential surface of the ink form roll, that is, the circumferential surface after the ink has been transferred.

However, in such a conventional ink supply system, the ink once taken out from the supply source is not returned to the supply source, and the inking train has a large number of roll groups with more than 10 fingers. , there was almost no risk of excess water penetrating into the ink supply source, and as a result, no actual harm occurred.

However, recently, as shown in the drawings, mesh rolls 3 have been developed that can omit a large number of inking roll groups.
When this was introduced into a lithographic printing system, the following problems occurred. In other words, mesh roll 3 is only 1
The plate cylinder 5 is passed through the book inking roll system 4, 4a.
Since the dampening water supply system 6 is connected to the plate cylinder 5,
The surplus water 7 supplied to the inking roll 4
The ink enters the return side circumferential surface of the mesh roll 3 through the return side circumferential surface of the fountain roll 8, and further passes through the return side circumferential surface 8a of the fountain roll 8 and mixes into the ink in the ink pan 9. , as an ink supply system specific to metering rolls such as the mesh roll 3, all of the ink supplied to the circumferential surface of the mesh roll 3 from the fountain roll 8, except for the ink inside the mesh, is transferred to the doctor blade 10. The excess ink that has been scraped off is returned to the ink pan 9 where water is mixed in, and is then supplied again while adhering to the circumferential surface of the fountain roll 8. If water is mixed in and supplied, the properties of the ink will change and not only will the quality of the printed paper deteriorate. Problems such as a decrease in the rate of ink adhesion within the roll, or a stripping phenomenon in which ink is no longer transferred to the roll, occur when there is too much water on the roll.

c Problems that the invention aims to solve The purpose of this invention is to eliminate the above disadvantages,
An object of the present invention is to create and provide a water removal device capable of preventing excess water that has reached the circumferential surface of a return side of a metering roll such as a mesh roll from entering an ink supply system.

d Means for solving the problem The configuration of this invention is such that it is possible to interlock a small roll train consisting of a single row or double rows on the return side circumferential surface of a metering roll such as a mesh roll, that is, the circumferential surface after ink has been transferred, and to The point is that they are pressed together to allow water to pass through.

e Effect Excess water that has entered the circumferential surface of the return side of the mesh roll is pressed against the circumferential surface of the small roll, and as a result of the sudden pressure change that occurs, some of the excess water is absorbed into the ink. While the water is mixed and emulsified, most of the remaining water that has not been emulsified is transferred onto the circumferential surface of the small roll after being pressed by the above-mentioned nipping and is stretched into a thin water film, increasing the surface area. is enlarged and exposed to the atmosphere and the heat generated by the operation of the printing press, which accelerates drying, and the above phenomenon is repeated by the pressure contact between the small rolls, causing a thin film of excess water to form further. Since it is spread over the circumference of multiple small rolls with a large surface area and exposed to the atmosphere, the evaporation is further promoted, so that the water absorption effect is also more pronounced.

f. Examples The configuration and operation of the present invention will be explained in detail below using specific examples and drawings.

After the ink 11 in the ink pan 9 is transferred from the fountain roll 8 to the mesh roll 3, the ink adhering to the peripheral surface of the mesh roll 3 is scraped off by the doctor blade 10, and only the ink inside the mesh that is left behind is scraped off. Ink application roll 4
and 4a to the circumferential surface of the plate cylinder 5.

On the other hand, water flows from the dampening water supply system 6 to the plate cylinder 5.
However, the excess water 7 enters the return side circumference of the mesh roll 3 via the return side circumference of the ink form roll 4, and if there is no device of the present invention, The infiltrated surplus water 7 passes through the return side circumferential surface 8a of the fountain roll 8 and reaches the ink pan 9.
It mixes into the ink 11 inside.

Therefore, in the present invention, a small roll 12 for water removal is pressed against the return side circumferential surface of the mesh roll 3, that is, the circumferential surface after the ink has been transferred, and furthermore, the small roll 12
A second small roll 13 is connected to form a small roll train.

Then, a portion of the surplus water 7 is emulsified in the ink at the pressure contact portion between the mesh roll 3 and the first small roll 12, and most of the surplus water that has not been emulsified is transferred to the periphery of the first small roll 12. The excess water forms a thin film on the surface and is further transferred to the circumferential surface of the second small roll 13, so the thin film of excess water comes into contact with the atmosphere over a wide surface area, thereby promoting evaporation. Ru.

If there is room, the third small roll 14 is pressed against the return side and the circumferential surface of the mesh roll 3, and the fourth small roll 15 is connected to the small roll 14, and the second
By forming a small roll train and arranging the second and third small roll trains in this way, the treatment of surplus water becomes even more perfect.

Note that the small rolls 12 and 14 that are brought into direct pressure contact with the mesh roll 3 are made of rubber or other soft material since the mesh roll 3 is made of metal. The material 15 is preferably made of metal, especially a hydrophilic chrome plated roll, but the effect may still be obtained even if it is made of rubber or other soft material.

g. Effects of the invention The invention makes it possible to rotate a single or double row of small roll trains 12, 13 or 14, 15 for water collection on the circumferential surface of the return side of the measuring roll, for example, the mesh roll 3, and to allow excess water to pass through. Because of the pressure contact, most of the surplus water 7 that has entered passes through the pressure contact position between the circumferential surface of the small roll 12 or 14 at the base end of the small roll train and the circumferential surface of the mesh roll 3, and from that position. A small roll 13 or 15 that is moved to a downstream position in the rotational direction of the small roll and further connects to the circumferential surface of the small roll 12 or 14 to form a train, respectively.
The excess water 7 passes through the pressure contact position with the circumferential surface of the roll and is transferred to a position downstream in the rotational direction of the roll from that position, and thus, every time it passes through each of the pressure contact devices, the excess water 7
Most of the water is stretched and developed from a relatively thick layer to a relatively thin water film. Therefore, each time the surplus water 7 is transferred to a small roll, the surface area that comes into contact with the atmosphere is expanded and thinned, so that steam is promoted into the atmosphere, and the hot air generated when the printing press is operated is also reduced. In addition, evaporation and drying of the thin film of excess water 7 is further accelerated.

On the other hand, at each press-contact position, a small amount of surplus water that has escaped transfer to the peripheral surface of the roll on the downstream side in the rotational direction is mixed and emulsified into the ink due to the rapid pressure change that occurs at each press-contact position. be done.

Therefore, since most of the surplus water 7 does not reach the fountain roll 8, the adverse effects caused by the surplus water 7 getting mixed into the ink 11 in the ink pan 9 can be prevented by the device of the present invention. This skillful removal makes it possible to always supply ink with a stable concentration from the metering roll, such as the mesh roll 3, to the plate cylinder 5.

Furthermore, as described above, the present invention provides a means for removing surplus water 7 before it enters the ink supply source by, for example, applying a strong pressing force to the circumferential surface of a metering roll such as a mesh roll.
We have developed a method that blocks excess water, avoids forced dripping at a position upstream of the pressure contact position in the rotational direction, and allows the excess water to pass through the pressure contact position, so there is no need to worry about any ink supply rolls being exposed to the flow. Because it successfully removes excess water without causing any damage to the engine, it is suitable for high-speed rotation and has sufficient practicality to withstand continuous operation over long periods of time.

Furthermore, by configuring this invention in this way, the scraping blade and saucer for water removal can be omitted, which not only makes the mechanism simple and inexpensive, but also eliminates the work of discarding excess water. It is very efficient as it is not required.

[Brief explanation of the drawing]

The drawings are explanatory diagrams showing a specific embodiment of the present invention. 3... Measuring roll, e.g. mesh roll, 4.
4a... Ink application roll, 5... Plate cylinder, 6...
Dampening water supply system, 7... Surplus water, 8... Fountain roll, 8a... Return side peripheral surface of fountain roll, 9... Ink pan, 10... Doctor blade, 11... Ink, 12, 14 ...Small roll for water removal, 13, 15...Small roll connected to small roll 12 or 14, respectively.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A mesh roll, etc., which is formed by pressing a small roll train to the return side circumferential surface of a metering roll such as a mesh roll, that is, the circumferential surface after ink transfer, so that a small roll train can be interlocked and excess water can pass through. Water removal device for measuring roll. (2) The device according to claim 1, wherein the small roll train is in a single row and is pressed against the circumferential surface of the mesh roll. (3) The device according to claim 1, which is a utility model registration, and comprises a double-row small roll train pressed against the circumferential surface of a mesh roll.