JP2000272080A - Dampening device for offset printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water in a dampening solution tank from splashing by providing a means for rendering an adherence of water and oil hard on a cylin der end surface of at least a piece of water fountain roller and vibrating damping roller, and forming the surface layer of a trunk central part with hydrophilic material. SOLUTION: The water fountain roller 2 is formed to rotate in a manner being immersed in a dampening solution tank 1 by its part, and its cylinder length is formed longer than the vibrating damping roller 5. A drum end surface 7 to both side drum ends from the sight inside of the cylinder end of the vibrating damping roller 5 for sending water on the surface of the water fountain roller 2 to a form roller 4 is lined with fluororubber to which water or oil is hard to adhere, and its cylinder central surface 8 is lined with lipophilic NBR. Accordingly, water from the form roller 4 and emulsified ink never adheres to the end surface 7 of the water fountain roller 2. Also, a means can be provided for rendering water and oil hard to adhere to the drum end surface of the vibrating damping roller 2; herein it can be given to both rollers. Furthermore, matter rendering water and oil hard to adhere can be coated on the cylinder end surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a humidifier for an offset printing press.

[0002]

2. Description of the Related Art FIG.
As shown in the figure, an ink device 1 for supplying printing ink to the plate cylinder 12 is provided in a portion of the plate cylinder 12 of the offset printing press 11.
3 and a humidifier 14 for applying water to the surface of the plate cylinder 12 are provided. The inking device 13 takes out the ink in the ink fountain 15 from between the bottom plates 16 with the fountain roller 17 and transfers the ink attached to the fountain roller 17 to the ink transfer roller 18.
And the ink forming roller 20 via a number of roller groups 19.
To supply ink to the plate cylinder 12. The humidifier 14 is for forming a minimum water film on the surface of the plate cylinder 12 so that the ink does not reach the non-image area of the plate cylinder 12, and a part of the humidifier 14 is immersed in the humidification water tank 21. The water source roller 22 that is rotated by being rotated, the water setting roller 23 that rotates in contact with the plate cylinder 12 and rotates, and the two waters that transfer the water adhering to the surface of the water source roller 22 to the water setting roller 23 by rolling and contacting Transfer rollers 24 and 25 are provided. Water roller 2
The water transfer roller 25 that comes into contact with the roller 3 is often oscillated in the axial direction in order to uniformly adhere water to the watering roller 23.

In the humidifier 14, a water source roller 22,
Water is sent in the order of the water transfer rollers 24, 25 and the watering roller 23. In the reverse order, the ink is transferred from the watering roller 23, which comes into contact with the plate cylinder 12, to the water base roller 22 side. As means for dealing with the transfer of ink from the wetting roller 23, two types of methods are employed. One is a method in which the surface of the water supply roller 22 or the water transfer roller 24 which is in contact with the water supply roller 22 is made of a material or a structure such that only water adheres and ink does not adhere,
The other is to allow ink to adhere to the surface of the water supply roller 22 or the water transfer roller 24, and to emulsify water and ink by using the ink film adhered to the roller surface, and to provide a humidifying water tank. In this method, the water 21 is sent from the water supply roller 22 to the watering roller 23.

The latter method can be easily realized by making the surface of the water supply roller 22 or the water transfer roller 24 a lipophilic material, and has the advantage that the humidifier 14 can be manufactured at low cost. As a method of making the roller surface a lipophilic material, a method of lining a lipophilic NBR (nitrile butadiene rubber) or the like on the roller surface is often used. Less than,
This type of humidifier is called a simple type.

[0005] As shown in FIG.
Is formed to be longer than the water transfer roller 24 that comes into contact therewith. In the simple type humidifier described above, the water and the emulsified ink spread to the roller barrel end while being transferred by each roller, and the ink spread to the roller barrel end is transferred to the barrel of the roller 24 by the water transfer. As shown by a two-dot chain line in FIG. 4, the water rolls out and is deposited on the body end of the water-source roller 22 that does not roll with the water transfer roller 24 and solidifies. When the ink is deposited in this manner and the surface of the water supply roller 22 becomes uneven, the rotation of the water supply roller 22 that is partially immersed in the water supply water tank 21 causes the water in the water supply water tank 21 to splash and move around. There is a problem of scattering and contaminating printed matter.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a simple type humidifying device for an offset printing press, which can prevent splashing of a humidifying water tank.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a water source roller which is partially immersed in a humidification water tank and rotates, and a watering roller which rotates while being in contact with the plate cylinder. And an at least one water transfer roller disposed between the fountain roller and the fountain roller, for transferring water adhering to the surface of the fountain roller to the fountain roller by rolling. In the humidifier, at least one of the water supply roller and the water transfer roller is provided with a means for preventing water and oil from adhering to the surface of the body end, and the body is provided between the body end surface and the water transfer roller. The central surface layer was made of a lipophilic material.

That is, by making the surface of the body end of at least one of the water source roller and the water transfer roller difficult for water and oil to adhere thereto, the water emulsified with water transferred from the watering roller. Ink was prevented from being transferred to the body end at the position of the roller where the surface of the body end made it difficult for water and oil to adhere, so that ink was not deposited on the body end of the water supply roller.

As a means for making it difficult for water and oil to adhere to the surface of the body end, a method of forming the surface layer of the body end with rubber to which water and oil do not easily adhere can be adopted. Silicone rubber or fluorine rubber can be used as the rubber to which water and oil do not easily adhere.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The basic configuration of the humidifier of this offset printing press is the same as that of the humidifier 14 shown in FIG. 3, and as shown in FIG. Roller 2, watering roller 4 that rolls in contact with plate cylinder 3 and rotates, and water adhering to the surface of
Two water transfer rollers 5 and 6 which are fed to the watering roller 4 by rolling contact are provided, and the water transferring roller 6 which is in rolling contact with the watering roller 4 is oscillated in the axial direction.

[0011] As shown in FIG.
The body length is formed longer than the water transfer roller 5, and the body end surface 7 from the inside of the body of the water transfer roller 5 to the both body ends is lined with fluorine rubber to which water and oil are unlikely to adhere. Have been. The torso center surface 8 between the fluoro rubber lined torso end surfaces 7 is lipophilic NBR
It is lined with. Therefore, the water and the emulsified ink transferred from the wetting roller 4 do not adhere to the end surface 7 of the water supply roller 2 and the ink is not deposited on this portion.

In the above-described embodiment, the body end of the water source roller is lined with fluorine rubber to which water or oil does not easily adhere. However, means for making it difficult for water or oil to adhere to the surface of the body end of the water transfer roller is provided. It is also possible to apply this means to both. When one or three or more water transfer rollers are used, this means may be applied to at least one of the water supply roller and the water transfer roller. As a means of making water or oil less likely to adhere, in addition to the method of lining fluoro rubber or silicone rubber, it is also possible to adopt a method of coating the surface of the roller end with a material which does not easily adhere to water or oil. it can.

[0013]

As described above, the humidifying device for a simplified offset printing press according to the present invention is characterized in that water and oil are applied to the body end surface of at least one of the water source roller and the water transfer roller. Water and emulsified ink transferred from the wetting roller were prevented from adhering to the barrel end at this roller position, so that ink was deposited on the barrel end of the water supply roller. The water splash caused by the water can be eliminated.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an embodiment of a humidifier.

FIG. 2 is a partially cutaway plan view of FIG. 1;

FIG. 3 is a vertical cross-sectional view of a part of a conventional offset printing press.

FIG. 4 is an enlarged plan view of a main part of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Humidification water tank 2 Water source roller 3 Plate cylinder 4 Watering roller 5, 6 Water transfer roller 7 Body end surface 8 Body center part surface 11 Offset printing machine 12 Plate cylinder 13 Inking device 14 Humidifier 15 Ink fountain 16 Bottom plate 17 Pot Roller 18 Ink Transfer Roller 19 Roller Group 20 Ink Roller 21 Humidifier Tank 22 Water Source Roller 23 Water Roller 24, 25 Water Transfer Roller

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yukihisa Tokumoto 2-15-28 Motejima, Nishiyodogawa-ku, Osaka-shi F-term in Hamada Printing Machinery Co., Ltd. 2C034 AA08 BB03 BB43

Claims (2)

[Claims] A water source roller that is partially immersed in a humidification water tank and rotates;
Humidification for an offset printing press, comprising one or more water transfer rollers disposed between the fountain roller and the fountain roller, and for transferring water adhering to the surface of the fountain roller to the fountain roller by rolling contact. In the apparatus, at least one of the water source roller and the water transfer roller is provided with a means for preventing water and oil from adhering to the surface of the body end, and a center part of the body between the body end surfaces is provided. A humidifier for an offset printing press, wherein the surface layer is formed of a lipophilic material. 2. The offset printing according to claim 1, wherein the means for preventing water and oil from adhering to the surface of the body end comprises forming a surface layer of the body end from rubber to which water and oil are difficult to adhere. Machine humidifier.