JPH0564877A - Web moistening device in rotary press - Google Patents

Abstract

PURPOSE:To obtain a web moistening device for rotary press capable of uniformly moistening the entire surface of a web with a good efficiency by a simple construction. CONSTITUTION:A transfer roller having an elastic surface is rotatably brought into pressure contact with a web non-contact peripheral surface of each of a first cooling roller 4 and a fourth cooling roller 7. Nozzles are so disposed as to jet water from the upstream side of the cooling rollers 4 and 7 in the rotating direction thereof to the contact parts of the cooling rollers 4 and 7 with the transfer rollers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web moisturizing device for a rotary printing machine, which is provided in a cooling device between a printing unit and a folding machine and applies moisture to a web which is dried and cooled after printing. ..

[0002]

2. Description of the Related Art In a web rotary printing machine, a web printed by a printing unit is dried on a printing surface by a drying device and then cooled by a cooling device and conveyed to a folder or theta where it is folded or cut. It is collected and collected. In the drying process of such printing process, not only the ink on the printing surface is dried, but also the moisture contained in the paper is removed, so that the paper that is folded by the folding machine is folded. There is a problem that the quality of the printed material may be remarkably deteriorated and the waste paper may be generated because the eyes may be torn or the staple binding part may be cut when binding and stacking the folded signatures. ..

Therefore, conventionally, as a humidifying device for imparting moisture to the web after drying and cooling, an injection needle-like water injection member or a roller-like humidification member is provided in the running path of the web before the folding machine, or the web is run. It has been proposed to provide a silicon applicator that forms a thin film of silicon on the printed surface of the inner web, and also to provide a plurality of nozzles between the drying device and the folding machine while the running web is running. A humidifying device has also been proposed in which water is sprayed onto the humidifier to humidify it directly or through a cooling roller.

[0004]

However, among such conventional humidifiers, in the case where an injection needle-shaped water injection member or a roller-shaped humidification member is provided, the web is moved in the vertical direction, which is the running direction of the web. However, there is a problem in that it cannot deal with humidification of folds extending in the width direction of the web. Also, the silicon applicator is
This is provided for the purpose of preventing paper jam due to static electricity, and if this is also used as a humidifier, there is a problem that the absolute amount of water supplied is insufficient and a sufficient humidifying effect cannot be expected. Furthermore, in the case of spraying water on the running web to humidify it directly or via a cooling roller,
In order to perform uniform humidification without unevenness, it is necessary to reduce the diameter of the water droplets and generate many mist-like water droplets. There is a problem that occurs. Also in this case, a sufficient humidifying effect cannot be expected.

It has also been proposed to provide a cooling roller to which a web is attached, and to attach this roller to a humidifying device of a roller set similar to the water supply device for the printing plate, but the structure is complicated. Not only can it be provided at a low cost, but since moistening is stopped only on the surface of the web and it takes time to penetrate into the web, it is possible to eliminate the generation of wrinkles when passing through the former of the folder. Can not. Furthermore, attempts have been made to reduce the temperature of the drying device without installing a humidifying device, but since the ink on the printing surface does not dry sufficiently, the undried printing surface can be formed by a former or turn bar of a folding machine. There is a problem that the printing surface is rubbed and the printing surface becomes dirty, and if the printing speed is reduced, the productivity is reduced. In addition, in this humidifier, the dampening water supplied to the printing plate by the water supply device is also transferred to the paper, and the water removed during drying is supplemented with this dampening water. Due to the widespread use of printing, it cannot be expected that the dampening water will replace the water.

The present invention has been made in view of the above points, and provides a humidifying device for a rotary printing press capable of efficiently and uniformly humidifying the entire surface of a web with a simple structure. The purpose is to

[0007]

In order to achieve such an object, the present invention provides a drying device for drying a printing surface of a web and a plurality of cooling devices for sequentially adhering and cooling the running web after drying. In a rotary printing machine equipped with a cooling device having a roller, a transfer roller having an elastic surface is rotatably brought into pressure contact with the web non-contact surface of the odd-numbered cooling roller and the even-numbered cooling roller, A nozzle for jetting water was provided from the upstream side in the circumferential direction of the circumferential surface, aiming at the contact portion between the cooling roller and the transfer roller.

[0008]

The water droplets ejected from the nozzle and sprayed toward the contact portion between the transfer roller and the cooling roller are present due to the existence of these rollers and the movement of the peripheral surfaces of these rollers to bite. And is guided to the abutting part of both rollers. Then, the water passes through the contact parts of both rollers to form a uniform film, which is transferred to the printing surface of the web running along with the cooling roller for humidification.

[0009]

1 and 2 show an embodiment of a web humidifier of a rotary printing machine according to the present invention. FIG. 1 is a schematic side view of a cooling device provided with a web humidifier, and FIG. 2 is a web humidifier. It is a piping diagram. In the figure, a cooling device 1 is provided between a drying device and a folding machine of a rotary printing machine, and the cooling device 1 includes a pair of left and right frames 3 whose four corners are connected by pipe stays 2. ing. These left and right frames 3
In this embodiment, four cooling rollers 4, 5, 6,
Both ends of 7 are rotatably mounted via bearings with the lines connecting the centers thereof being arranged in a roughly rhombic shape. Further, both ends of a plurality of guide rollers 8 are rotatably supported on the left and right frames 3 via bearings, and the web 9 dried by a drying device after printing is cooled by the cooling rollers 4.
6 to 6 and the guide roller 8 and then sent toward the folding machine. And the web 9
Is an odd numbered first cooling roller 4 and third cooling roller 6
And the back surface of the second cooling roller 5 and the fourth cooling roller 7 of even number.

Then, in the vicinity of the non-web contact surface between the first cooling roller 4 and the third cooling roller 7, the web humidifying device 10 is provided.
And a web humidifier 11 are provided respectively. These web humidifiers 10 and 11 include right and left frames 3
A pair of left and right brackets 12 fixed to the inner surfaces of the
The bracket 12 is provided with a transfer roller 13 having an elastic surface such as rubber and having substantially the same length as the cooling rollers 4 and 7, both ends of which are rotatably supported. The transfer roller 13 is pressed against the non-contact surface of the cooling rollers 4 and 7 by the air cylinder 14 shown in FIG. 2, and when not in use, the piston rod 15 of the air cylinder is retracted to move the cooling rollers 4 and 7. It is configured to be separated from the non-contact surface. Reference numeral 16 is a pipe connecting the compressor 17 and the air cylinder 14, and an electromagnetic switching valve 18 and a flow rate control valve 19 are provided on the pipe 16.

A nozzle tube 20 extending in the axial direction of the transfer roller 13 is provided between the holders fixed to the left and right brackets 12.
Are positioned on the upstream side in the circumferential direction of the cooling rollers 4, 7 and are axially mounted. In this nozzle tube 20, a plurality of nozzles 21 are provided, and a plurality of nozzles 21 are provided in the direction of water injection to the cooling rollers 4, 7 and the transfer roller. It is directed toward the contact portion with 13, and is supported in parallel in the axial direction. On the other hand, in the vicinity of the frame 3, a tank 25 connected to the water supply source 22 by a pipe 24 having a strainer 23 is arranged, and water 26 purified by the strainer 23 is placed in the tank 25. The amount of stored water is regulated by the float 27 and stored. The tank 25 and the nozzle pipe 20 are provided with a pipe 28 and a pipe 2 branched from the pipe 28.
A pump 30 for pumping the water 26 in the tank 25 is directly connected to the motor 31 on the pipe 28. Reference numeral 32 is a pressure gauge provided on the pipe 28, and 33 is a flow rate adjusting valve provided on the pipe 34 branched from the pipe 28. Furthermore, on each pipe 29,
An electromagnetic opening / closing valve 35, a regulating valve 36, and a pressure gauge 37 are provided.

The operation of the web moisturizing device configured as described above will be described. Prior to the printing work, one end of the web 9
So-called paper passing from the paper feeding device to the printing unit and the drying device is performed to guide it in front of the cooling device 1, and the cooling rollers 4, 5, 6, 7 and the guide roller 8 are passed through the paper, and the paper is guided to, for example, a folding machine. Thread through. Then, the transfer roller 13 is brought into pressure contact with the web non-contact surface of the cooling rollers 4 and 7, and then the printing operation is started.

When the printing operation is started, the web 9 printed by the printing unit and dried by the drying device is cooled by contacting the cooling rollers 4, 5, 6, 7 with the front surface and the back surface alternately. The individual guide rollers 8 run alongside each other. At this time, the water 26 pumped up from the tank 25 by the pump 30 passes through the pipes 28 and 29 and the nozzle pipes 2 at the two locations.
0, jetted from the nozzle 21 and cooled rollers 4, 7
And adheres to the transfer roller 13 as a water drop.

Water droplets adhering to the contact portions between the cooling rollers 4 and 7 and the transfer roller 13 are located on both rollers 13 and 4 (7).
The presence of the surface of both rollers 13 and 4 (7)
By moving the peripheral surface of the rollers so as to bite, they serve as guides for water droplets, and are assisted by the movement of air on the surfaces of the rollers 13, 4 (7).
It is guided to the contact part of (7). In this case, the transfer roller 13
Is made of an elastic material and a predetermined preload is applied between the transfer rollers 13 and the cooling rollers 4 and 7, so that the transfer rollers 13 are guided to the contact portions of the cooling rollers 4 and 7 and the transfer rollers 13. The water droplets form a uniform water film by passing through the counter contact points between the cooling rollers 4 and 7 and the transfer roller 13, and are transferred to the surfaces of the cooling rollers 4 and 7. This water film is circulated by the cooling rollers 4 and 7, and transfers to the web 9 at the splicing portion of the web 9 to the cooling rollers 4 and 7 to moisten it, so that the water content corresponding to the water content lost in the drying device is not generated. It is given and humidification is performed. Cooling rollers 4, 7 to web 9
In the transfer of the water film to, the transfer time is not instantaneous, and there is the advancing time corresponding to the winding angle of the web 9, so that sufficient humidification is performed. Since the back surface of the web 9 is attached to the cooling roller 4 and the front surface of the web 9 is attached to the cooling roller 7, both sides of the web 9 are humidified.

The size of the water droplets ejected from the nozzle 21 is
Although it depends on factors such as the diameter and type of the nozzle 21 or whether or not air is used, the amount of air, the amount of water supplied, and the like, even if relatively large water droplets are used, the transfer roller 13 and the cooling rollers 4 and 7 pair. While passing through the contact portion, a water film can be formed and uniform humidification can be performed, and it is not necessary to reduce the water droplets unlike the conventional nozzles. Therefore, the diameter of the nozzle 21 can be increased and the supply amount due to clogging can be increased. There is no variation.
Further, since the water droplets are large, the kinetic energy of the water droplets is large, and most of the water droplets are attached when they come into contact with the transfer roller 13, so that the attachment efficiency is higher than that of small water droplets.

[0016]

As is apparent from the above description, according to the present invention, a cooling device having a drying device for drying a printed surface of a web and a plurality of cooling rollers for sequentially contacting and cooling the web running after drying are provided. In a rotary printing machine equipped with a device, a transfer roller having an elastic surface is rotatably pressure-contacted to a web non-contacting peripheral surface of an odd-numbered cooling roller and an even-numbered cooling roller, and a peripheral surface of the cooling roller. The arc-shaped peripheral surface of the cooling roller and the transfer roller serves as a guide surface for guiding the water droplets by providing the nozzle for injecting water from the upstream side in the circulation direction toward the contact portion between the cooling roller and the transfer roller. Therefore, the adhesion efficiency of water to the roller is improved. Further, since the water droplets pass through the contact surface between the transfer roller and the cooling roller, the water adheres evenly to the web, and the number of accidents in the subsequent folding machine or theta is reduced. Further, even if the water droplets to be ejected are large, a water film is formed while passing through the counter contact points between the transfer roller and the cooling roller, uniform humidification can be achieved, and the nozzle diameter can be increased, resulting in a supply due to clogging. There is no variation in quantity. In addition, since the water droplets are large, the kinetic energy of the water droplets is large, and when the water droplets come into contact with the transfer roller, most of the water droplets adhere to the transfer roller, which increases the adhesion efficiency. Furthermore, since excess water drops do not become mist and scatter around the nozzle and rust does not occur, durability of peripheral members is improved. Further, sufficient moisture as described above is applied to the front surface and the back surface of the web, and the moisturizing function is improved.

[Brief description of drawings]

FIG. 1 is a schematic side view of a cooling device that implements a web humidifier.

FIG. 2 is a piping diagram of a web humidifier.

[Explanation of symbols]

 1 Cooling Device 4 Cooling Roller 5 Cooling Roller 6 Cooling Roller 7 Cooling Roller 9 Web 10 Web Humidifying Device 11 Web Humidifying Device 13 Transfer Roller 20 Nozzle Tube 21 Nozzle 26 Water

Front Page Continuation (72) Inventor Akira Kosuge 210 Kiriki, Sekijuku-cho, Higashi-Katsushika-gun, Chiba Prefecture Komori Corporation Sekijuku Plant

Claims (1)

[Claims] 1. A drying device for drying a printed surface of a web,
In a rotary printing press equipped with a cooling device having a plurality of cooling rollers for sequentially adhering and cooling the running web after drying, a transfer roller having an elastic surface, an odd numbered cooling roller and an even numbered said A nozzle for injecting water is provided so as to be rotatably pressure-contacted with the cooling roller on the peripheral surface of the web which is not attached to the cooling roller, from the upstream side in the circumferential direction of the cooling roller toward the contact portion between the cooling roller and the transfer roller. A web humidifier for a rotary printing press, which is characterized in that