JP2008110542A - Dampening water supplying arrangement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dampening water supplying arrangement which prevents occurrence of imbalance in supply of dampening water, according to a region of a plate surface, and provides a high printing quality for the whole printed matter, lessens an installation space, and thereby widens a sphere of usable printing machines. <P>SOLUTION: The dampening water supplying arrangement has: one water tank which accumulates the dampening water so that the roller surface of a water source roller is immersed in the dampening water; one water source roller which takes out the dampening water accumulated in the water tank onto the roller surface of itself by rotation thereof; and one amount adjusting roller which transfers the dampening water transferred from the water source roller to a back roller group, and adjusts the amount of transfer thereof. The back roller group consists of a plurality of sets of back roller groups, and the arrangement is so constituted that a plurality of form rollers come into contact with the plate surface and transfer the dampening water onto it. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention belongs to the technical field of offset printing presses. In particular, the present invention relates to a dampening water supply device that can stably supply dampening water over the entire surface of a printing plate without excess or deficiency.

In an offset printing machine, a lithographic printing plate having an image-line portion oleophilic and a non-image-line portion having water retention is used. When dampening water is brought into contact with the entire surface of the printing plate, dampening water is transferred only to the non-image area having water retention. The printing ink is oleophilic and has a property of repelling dampening water. When the printing ink is brought into contact with the entire surface of the printing plate, the printing ink is transferred only to the image area having lipophilicity. The offset printing machine is a printing machine of a method (a method of transferring by offset) in which an ink image is formed on a printing plate based on this principle and the ink image is transferred to a printing paper through a blanket.
FIG. 4 shows an example of the roller arrangement in the printing unit (a part of) the offset printing machine. As shown in FIG. 4, the printing unit includes a dampening water supply unit 100 that supplies dampening water to the plate surface, an ink supply unit 200 that supplies ink to the plate surface, and a plate cylinder 300 that is a mounting roller for the printing plate. And a blanket cylinder 400, which is a blanket mounting roller that receives the imaged ink from the plate cylinder and transfers it to the printing paper. The dampening water supply unit 100 includes a water boat 101 for storing dampening water, and a water source roller 102 that takes out dampening water on the roller surface by rotating the roller surface immersed in the dampening water of the water boat 101. The dampening water transferred from the water source roller 102 is transferred to the water roller 103 and the amount of transfer is adjusted, and the dampening water transferred from the metering roller 103 is watered. There are a water transfer roller 104 that transfers to the form roller 105, and a water transfer roller 105 that transfers dampening water transferred from the water transfer roller 104 to the plate cylinder 300.

In the offset printing press, as described above, the property of printing ink that is oleophilic and repels dampening water is used. For this reason, if dampening water is supplied excessively, problems such as highlights flying, ink emulsification and printing stains occur. On the other hand, when the supply amount of dampening water is insufficient, there are problems such as the shadow being crushed and the background dirt (dirt on the non-image area) occurring. Therefore, it is necessary to ensure that an appropriate amount of dampening water is present in the non-image area. On the other hand, the fountain solution in the non-image area is transferred and lost when it comes into contact with the ink roller or the blanket cylinder 400, and is also lost by scattering into the air due to volatilization. Therefore, in order to replenish the lost fountain solution, supplying an appropriate amount of the fountain solution from the fountain solution supply unit 100 to the printing plate is extremely important for normal printing. Therefore, there are many inventions regarding a method of supplying an appropriate amount of dampening water (Patent Document 1, Patent Document 2, and Patent Document 3).
JP-A-61-148061 JP-A-4-836343 However, these inventions are inventions for supplying an appropriate amount of dampening water to the printing plate as a whole. Even if it is adjusted to be an appropriate amount as a whole, it can happen that the portion is not an appropriate amount. For example, when the state of the roller in the dampening water supply unit 100 is not uniform in the left-right direction (the direction of the roller shaft), dampening water that is biased in that direction is supplied. An example of the nip failure between the rollers in the fountain solution supply unit 100 is shown in FIG. As shown in FIG. 5, the metering roller 103 and the water transfer roller 104 are in a state of being separated, that is, the nip strength is different in the left-right direction, and there is a non-contact nip failure region between the rollers on the right side. Since the fountain solution does not move from the defective nip region, the dampening solution supply insufficient region appears on the right side of the plate cylinder 300. Therefore, there is an invention in which a plurality of dampening water supply systems are provided in order to supply a necessary amount of dampening water to a necessary place and prevent the occurrence of density unevenness in printed matter (Patent Document 4). However, in the present invention, a plurality of dampening water supply systems must be provided around the plate cylinder 300 in the printing unit. The ink supply unit 200 is provided around the fountain solution supply unit 100. In many offset printing machines, there is no space for providing a new dampening solution supply system. Therefore, there is a problem that the offset printing machine capable of carrying out the present invention is limited to a special one.

  The present invention has been made to solve the above problems. The purpose of this is to obtain a high print quality in the entire printed product without biasing the supply of dampening water depending on the part of the plate surface, and to reduce the installation space and expand the applicable printing press. It is to provide a water supply device.

The dampening water supply apparatus according to claim 1 of the present invention includes a water boat that stores dampening water so that the roller surface of the water source roller is immersed in the dampening water, and the water boat is stored by rotating. One fountain roller that takes out the dampening water on its own roller surface, and one metering that transfers the fountain solution transferred from the fountain roller to the rear roller group and adjusts the transfer amount A dampening water supply device having a roller, wherein the rear roller group includes a plurality of rear roller groups, and the plurality of swim rollers contact the plate surface to transfer the dampening water to the plate surface. It is composed.
A dampening water supply apparatus according to a second aspect of the present invention is the dampening water supply apparatus according to the first aspect, wherein one set of the rear roller group is the dampening water transferred from the metering roller. Is formed of one water transfer roller for transferring the water to the wet roller, and one swim roller for transferring the dampening water transferred from the water transfer roller to the plate surface.
A dampening water supply apparatus according to a third aspect of the present invention is the dampening water supply apparatus according to the first aspect, wherein one set of the rear roller group is the dampening water transferred from the metering roller. Is composed of one water transfer roller that transfers the water to the swim roller, and two swim rollers in parallel arrangement that transfer the dampening water transferred from the water transfer roller to the plate surface. is there.
A dampening water supply apparatus according to a fourth aspect of the present invention is the dampening water supply apparatus according to the first aspect, wherein one set of the rear roller group is the dampening water transferred from the metering roller. Two water transfer rollers arranged in series for transferring the water to the swim roller, and two swim rollers arranged in parallel for transferring the dampening water transferred from the water transfer roller to the plate surface. It is a thing.

According to the dampening water supply apparatus according to claim 1 of the present invention, dampening water is stored by one water boat so that the roller surface of the water source roller is immersed in the dampening water, and one water source roller is provided. The dampening water stored in the water boat is taken out to the roller surface by rotating, and the dampening water transferred from the water source roller by one metering roller is transferred to the rear roller group and the transfer amount The rear roller group is composed of a plurality of sets of rear roller groups, and the plurality of swim rollers come into contact with the plate surface, and the fountain solution is transferred to the plate surface. That is, the front roller group including the water boat is only one set, and only the rear roller group is a plurality of sets. Therefore, there is no bias in the supply of dampening water depending on the part of the plate surface, and it is possible to obtain a high print quality in the whole printed matter, and further, the dampening water in which the applicable printing press is expanded by reducing the installation space. A feeding device is provided.
Moreover, according to the dampening water supply apparatus according to claim 2 of the present invention, in the dampening water supply apparatus according to claim 1, one set of the rear roller group includes dampening water transferred from the metering roller. It consists of one water transfer roller that transfers to the water roller, and one water roller that transfers dampening water transferred from the water roller to the plate surface. That is, one set of the rear roller group is configured by only two rollers. Therefore, the installation space can be remarkably reduced.
Moreover, according to the dampening water supply apparatus according to claim 3 of the present invention, in the dampening water supply apparatus according to claim 1, one set of the rear roller group includes dampening water transferred from the metering roller. It consists of one water transfer roller that transfers to the water application roller, and two water application rollers arranged in parallel to transfer the dampening water transferred from the water transfer roller to the plate surface. That is, one set of the rear roller group is constituted by three rollers, and two of them are the swim rollers arranged in parallel. Therefore, it is possible to particularly reduce the uneven supply of dampening water while the installation space is small.
Moreover, according to the dampening water supply apparatus according to claim 4 of the present invention, in the dampening water supply apparatus according to claim 1, one set of the rear roller group includes dampening water transferred from the metering roller. It consists of two water transfer rollers arranged in series to be transferred to the water roller, and two water transfer rollers arranged in parallel to transfer the dampening water transferred from the water transfer roller to the plate surface. That is, one set of the rear roller group is constituted by four rollers, and the distribution of the dampening water is made uniform by the water transfer roller arranged in series and the watering roller arranged in parallel. Therefore, the supply bias of dampening water can be remarkably reduced.

Next, embodiments of the present invention will be described with reference to the drawings. An example of the structure in the dampening water supply apparatus of this invention is shown in FIG. In FIG. 1, 1 is a water boat, 2 is a water source roller, 3 is a metering roller, 4a and 4b are water transfer rollers, 5a and 5b are swim rollers, 200 is an ink supply section, 300 is a plate cylinder, 400 is It is a blanket cylinder.
The water boat 1 is a container for storing dampening water so that the roller surface is immersed over the entire length of the roller portion of the water source roller 2. The fountain solution is water for moistening the non-image area so that ink does not adhere to the non-image area in the printing plate (lithographic printing plate) in offset printing. In the example shown in FIG. 1, there is one water boat 1 for one color printing portion on one side.

The water source roller 2 is immersed in the dampening water stored in the water boat 1 at a part of the roller portion. The water source roller 2 rotates to take out the dampening water accumulated in the water boat 1 onto the surface of the roller not immersed in the dampening water. The water source roller 2 is rotating in contact with the metering roller 3 on the surface of each other. The water source roller 2 transfers the fountain solution taken out on the surface of the water source roller 2 to the metering roller 3 through the contact portion. In the example shown in FIG. 1, there is one water source roller 2 for one color printing portion on one side.
The metering roller 3 transfers the dampening water transferred from the water source roller 2 to the rear roller group and adjusts the transfer amount. For example, the metering roller 3 is formed so that its support portion is eccentric, and is attached to and detached from the water transfer rollers 4a and 4b while maintaining a constant contact pressure with the water source roller 2 by expansion and contraction of the air cylinder. It has become. In the example shown in FIG. 1, there is one metering roller 3 for one color printing portion on one side.

The water transfer rollers 4a and 4b are rollers in the rear roller group. The water transfer roller 4a is in contact with the swim roller 5a and rotating on the surface of the roller. When the metering roller 3 is attached, the water transfer roller 4a transfers the dampening water transferred from the metering roller 3 to the swim roller 5a through the contact portion. Further, the water transfer roller 4b is in contact with the swim roller 5b and rotating on the surface of each other. When the metering roller 3 is attached, the water transfer roller 4b transfers the dampening water transferred from the metering roller 3 to the swim roller 5b through the contact portion. In the example shown in FIG. 1, there are two water transfer rollers for one color printing portion on one side, that is, two water transfer rollers 4a and 4b.
The swim rollers 5a and 5b are rollers in the rear roller group. The roller surfaces of the swim rollers 5a and 5b are configured to be attached to and detached from the peripheral surface of the plate cylinder 300, and are rotated in contact with the surface (plate surface) of the printing plate when worn. Each of the swim rollers 5a and 5b transfers the dampening water transferred from each of the water transfer rollers 4a and 4b to the plate surface through the contact portion. In the example shown in FIG. 1, there are two swim rollers 5 a and 5 b for one printing unit of the offset printing machine, that is, two swim rollers 5 a and 5 b.

  Thus, in the example shown in FIG. 1, the rear roller group is composed of two rear roller groups, and one group of the rear roller group transfers the dampening water transferred from the metering roller to the swim roller. One water transfer roller to be transferred, and one swim roller for transferring dampening water transferred from the water transfer roller to the plate surface. That is, one set of the rear roller group is configured by only two rollers, and the two swim rollers are in contact with the plate surface as a whole and transfer dampening water to the plate surface. Accordingly, there is no bias in the supply of dampening water depending on the portion of the plate surface, and it is possible to obtain high print quality in the entire printed matter, and in addition, since the installation space is small, the applicable printing press can be expanded. it can.

Next, another example of the structure in the dampening water supply apparatus of this invention is shown in FIG. In FIG. 2, 21 is a water boat, 22 is a water source roller, 23 is a metering roller, 24a and 24b are water transfer rollers, 25a, 25b, 25c and 25d are bathing rollers, 200 is an ink supply section, and 300 is a plate. The cylinder 400 is a blanket cylinder.
The water boat 21 is a container that stores dampening water so that the roller surface is immersed over the entire length of the roller portion of the water source roller 22. The fountain solution is water for moistening the non-image area so that ink does not adhere to the non-image area in the printing plate (lithographic printing plate) in offset printing. In the example shown in FIG. 2, there is one water boat 21 for one color printing portion on one side.

The water source roller 22 is immersed in the dampening water stored in the water boat 21 at a part of the roller portion. The water source roller 22 rotates to take out the dampening water stored in the water boat 21 onto the surface of the roller that is not immersed in the dampening water. The water source roller 22 is rotating in contact with the metering roller 23 on the surface of each other. The water source roller 22 transfers the dampening water taken out on the roller surface of the water source roller 22 to the metering roller 23 through the contact portion. In the example shown in FIG. 2, there is one water source roller 22 for one color printing portion on one side.
The metering roller 23 transfers the dampening water transferred from the water source roller 22 to the rear roller group and adjusts the transfer amount. For example, the metering roller 23 has an eccentric support portion and is configured to be attached to and detached from the water transfer rollers 24a and 24b while maintaining a constant contact pressure with the water source roller 22 by expansion and contraction of the air cylinder. It has become. In the example shown in FIG. 2, one metering roller 23 exists for one color printing portion on one side.

The water transfer rollers 24a and 24b are rollers in the rear roller group. The water transfer roller 24a rotates in contact with the two swim rollers 25a and 25b on the surface of each other. When the metering roller 23 is attached, the water transfer roller 24a transfers the dampening water transferred from the metering roller 23 to the two swim rollers 25a and 25b through the contact portion. Further, the water transfer roller 24b is in contact with the swim rollers 25c and 25d and rotating on the surface of the rollers. When the metering roller 23 is worn, the water transfer roller 24b transfers the dampening water transferred from the metering roller 23 to the swim rollers 25c and 25d through the contact portion. In the example shown in FIG. 2, there are two water transfer rollers for one color printing portion on one side, that is, two water transfer rollers 24a and 24b.
The swim roller 25a, 25b, 25c, 25d is a roller of the rear roller group. The roller surfaces of the swim rollers 25a, 25b, 25c, and 25d are configured to be attached to and detached from the peripheral surface of the plate cylinder 300, and are rotated in contact with the surface (plate surface) of the printing plate when worn. The wetting rollers 25a and 25b transfer the dampening water transferred from the water transfer roller 24b to the printing plate through the contact portion, from the water transfer roller 24a. In the example shown in FIG. 2, there are four swim rollers, that is, four of the swim rollers 25 a, 25 b, 25 c, and 25 d, for one color printing portion on one side.

  Thus, in the example shown in FIG. 2, the rear roller group is composed of two rear roller groups, and one group of the rear roller group transfers the dampening water transferred from the metering roller to the swim roller. It consists of one water transfer roller to be moved and two swim rollers arranged in parallel to transfer the dampening water transferred from the water transfer roller to the plate surface. That is, one set of the rear roller group is composed of three rollers, two of which are juxtaposed rollers arranged in parallel, and as a whole, four dampening rollers come into contact with the plate surface and dampening water. Is transferred to the plate. Accordingly, it is possible to particularly reduce the bias in the supply of the fountain solution depending on the portion of the plate surface, to obtain high print quality in the whole printed matter, and to reduce the installation space, so that the applicable printing press can be expanded. be able to.

Next, another example of the structure in the dampening water supply apparatus of this invention is shown in FIG. In FIG. 3, 31 is a water boat, 32 is a water source roller, 33 is a metering roller, 34a, 34b, 34a and 34b are water transfer rollers, 35a, 35b, 35c and 35d are swim rollers, and 200 is an ink supply unit. , 300 is a plate cylinder, and 400 is a blanket cylinder.
The water boat 31 is a container for storing dampening water so that the roller surface is immersed over the entire length of the roller portion of the water source roller 32. The fountain solution is water for moistening the non-image area so that ink does not adhere to the non-image area in the printing plate (lithographic printing plate) in offset printing. In the example shown in FIG. 3, there is one water boat 31 for one color printing portion on one side.

The water source roller 32 is immersed in the dampening water stored in the water boat 31 at a part of the roller portion. The water source roller 32 rotates to take out the dampening water stored in the water boat 31 onto the surface of the roller not immersed in the dampening water. The water source roller 32 is rotating in contact with the metering roller 33 on the surface of each other. The water source roller 32 transfers the dampening water taken out on the roller surface of the water source roller 32 to the metering roller 33 through the contact portion. In the example shown in FIG. 3, there is one water source roller 32 for one color printing portion on one side.
The metering roller 33 transfers the dampening water transferred from the water source roller 32 to the rear roller group and adjusts the transfer amount. For example, the metering roller 33 has a support portion formed in an eccentric shape, and can be attached to and detached from the water transfer rollers 34a and 34b while maintaining a constant contact pressure with the water source roller 32 by expansion and contraction of the air cylinder. It has become. In the example shown in FIG. 3, there is one metering roller 33 for one color printing portion on one side.

  The water transfer rollers 34a, 34b, 34c, and 34d are rollers in the rear roller group. The water transfer roller 24a is in contact with the water transfer roller 24b and rotating on the surface of each other. When the metering roller 33 is attached, the water transfer roller 34a transfers the dampening water transferred from the metering roller 33 to the water transfer roller 34b through the contact portion. The water transfer roller 34b is in contact with the two swim rollers 35a, 35b on the surface of each other and is rotating. The water transfer roller 34b transfers the dampening water transferred from the water transfer roller 24a to the two swim rollers 35a and 35b through the contact portion. Further, the water transfer roller 34c is in contact with the water transfer roller 34d and rotates on the surface of each other. When the metering roller 33 is attached, the water transfer roller 34c transfers the dampening water transferred from the metering roller 33 to the water transfer roller 34d through the contact portion. The water transfer roller 34d rotates in contact with the two swim rollers 35c and 35d on the surface of each other. The water transfer roller 34d transfers the dampening water transferred from the water transfer roller 34c to the two swim rollers 35c and 35d through the contact portion. In the example shown in FIG. 3, there are four water transfer rollers, that is, four water transfer rollers 34 a, 34 b, 34 c, and 34 d, for one color printing portion on one side.

  The swim rollers 35a, 35b, 35c, and 35d are rollers in the rear roller group. The roller surfaces of the swim rollers 35a, 35b, 35c, and 35d are configured to be attached to and detached from the peripheral surface of the plate cylinder 300, and are rotated in contact with the surface (plate surface) of the printing plate when worn. The wetting rollers 35a and 35b transfer the dampening water transferred from the water transfer roller 34d to the printing plate through the contact portion from the water transfer roller 34b. In the example shown in FIG. 3, there are four swim rollers, that is, four swim rollers 35 a, 35 b, 35 c, and 35 d, for one color printing portion on one side.

  Thus, in the example shown in FIG. 3, the rear roller group is composed of two rear roller groups, and one group of the rear roller group transfers the dampening water transferred from the metering roller to the swim roller. The two water transfer rollers are arranged in series, and the two swim rollers are arranged in parallel to transfer the fountain solution transferred from the water transfer roller to the plate surface. That is, one set of the rear roller group is constituted by four rollers, and the distribution of the dampening water is made uniform by the water transfer roller arranged in series and the watering roller arranged in parallel. Therefore, the bias in the supply of dampening water can be remarkably reduced depending on the portion of the plate surface, high print quality can be obtained in the entire printed matter, and the installation space can be reduced, so that the applicable printing press can be expanded. be able to.

It is a figure which shows an example (the 1) of a structure in the dampening water supply apparatus of this invention. It is a figure which shows an example (the 2) of a structure in the dampening water supply apparatus of this invention. It is a figure which shows an example (the 3) of a structure in the dampening water supply apparatus of this invention. It is a figure which shows an example of roller arrangement | positioning in the printing unit (part) of an offset printing machine. It is a figure which shows an example of the nip defect between the rollers in the dampening water supply part.

Explanation of symbols

1,21,31 Water boat 2,22,32 Water source roller 3,23,33 Metering roller 4a, 4b, 24a, 24b, 34a, 34b, 34c, 34d Water transfer roller 5a, 5b, 25a, 25b, 25c , 25d, 35a, 35b, 35c, 35d Swim-on roller 200 Ink supply unit 300 Plate cylinder 400 Blanket cylinder

Claims (4)

One water boat for storing dampening water so that the roller surface of the water source roller is immersed in the dampening water, and one water for taking out dampening water stored in the water boat by rotating to its own roller surface. A dampening water supply device having a main roller and a single metering roller for transferring the dampening water transferred from the water source roller to a rear roller group and adjusting a transfer amount thereof, The dampening water supply apparatus is characterized in that the roller group is composed of a plurality of rear roller groups, and a plurality of swim rollers contact the plate surface to transfer the dampening water to the plate surface. The dampening water supply apparatus according to claim 1, wherein one set of the rear roller group includes one water transfer roller that transfers the dampening water transferred from the metering roller to the swim roller, A dampening water supply apparatus comprising: a dampening roller for transferring the dampening water transferred from the water transfer roller to the plate surface. The dampening water supply apparatus according to claim 1, wherein one set of the rear roller group includes one water transfer roller that transfers the dampening water transferred from the metering roller to the swim roller, A dampening water supply device comprising two dampening rollers arranged in parallel to transfer the dampening water transferred from the water transfer roller to the plate surface. 2. The dampening water supply apparatus according to claim 1, wherein one set of the rear roller group includes two water transfers arranged in series for transferring the dampening water transferred from the metering roller to the swim roller. 3. A dampening water supply apparatus comprising a roller and two dampening rollers arranged in parallel to transfer the dampening water transferred from the water transfer roller to the plate surface.

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