JPH03175038A - Damping arrangement of offset press - Google Patents

Abstract

PURPOSE:To control easily and certainly a quantity of damping water to be supplied to each part in a pattern printing width direction of an offset plate by a method wherein a controller which controls respectively are separately the generating quantity of fine liquid particles with an ultrasonic vibrator is provided to a coarse ink natured liquid feeder. CONSTITUTION:One end of a wide width duct 24 is opposed near onto a liquid surface 21 wherein an ultrasonic vibrator 18 is located under a state of enclosing a misty fine liquid drop group generated around a columnar liquid drop, and an outlet 20a having the other end contracted part of the wide width duct 24 is opposed to a damping roller 3. The inside of the wide width duct 24 is partitioned with a partition wall 25, and a transfer path 20 which transfers respectively and separately the fine liquid drops to be generated with an ultra sonic vibrator 18 corresponding respectively and separately to each plate divided part A1 - An of an offset plate 2b to each damping roller divided part B1 - Bn on the damping roller 3 from the outlet 20a is formed. A controller controls the generating quantity of misty fine liquid drops with the ultrasonic vibrator 18 by increasing or decreasing output electric power of an excitation power apparatus 19.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dampening device for an offset printing press. More specifically, it includes a water storage device that stores an inkphobic liquid that can adhere to a non-picture area of an offset plate, and an inkphobic liquid supply device that supplies the inkphobic liquid in the water storage device to the offset plate. The present invention relates to a dampening device for an offset printing press.

[Prior Art] As a conventional dampening device for an offset printing press, the following configuration is known. First, as a first conventional structure, one is known in which the dampening water in the water tank is held in accordance with the rotation of the water fountain roller and is supplied onto the offset plate via a plurality of rollers. A second conventional configuration uses a plunger pump to inject dampening water from a nozzle and also supplies pressurized air to spray fine particles of dampening water onto the offset plate. It is being Furthermore, as a third conventional configuration, by scratching the brush roller provided in the water boat with a doctor,
Droplets of dampening water are splashed up and the dampening water is supplied onto the offset plate via a plurality of transfer rollers.

By the way, the purpose of the dampening device is to prevent ink from transferring to the non-picture areas on the offset plate by forming a water film on the non-picture areas. However, since the area ratio of the non-picture area differs in each part in the pattern printing width direction of the offset plate, it is desirable that the amount of dampening water supplied to each part increases or decreases depending on the area ratio of the non-picture part. It will be done. Therefore, in each of the conventional configurations described above, the amount of dampening water supplied to each portion of the offset plate in the pattern printing width direction is adjusted by the following configuration.

In the first conventional configuration, the plate pieces are brought into contact with different pressures on the water head roller corresponding to each part in the pattern printing width direction of the offset plate. Further, in the second conventional configuration, the rotational speed of the drive motor of the plunger pump corresponding to each part in the pattern printing width direction of the offset plate is adjusted, and the amount of dampening water jetted out is made different for each part. Further, in the third conventional configuration, a gate whose opening degree can be adjusted is separately provided between the brush roller and the transfer roller corresponding to each part in the pattern printing width direction of the offset plate.

[Problems to be Solved by the Invention] However, in each of the above-mentioned conventional configurations, it is difficult to finely adjust the amount of dampening water supplied to each part in the width direction of the image printing of the offset plate, so it is very difficult to adjust the amount of dampening water. There was a problem that it took a lot of time.

In addition, in the second conventional configuration, when the amount of air is increased to make the droplets ejected from the nozzle finer,
Droplets are scattered by the air, reducing the dampening water supply efficiency, and the particle size of the droplets jetted from the nozzle varies depending on the distance from the nozzle center axis, so the thickness of the supplied water film decreases. The dampening water becomes uneven and thick, and there is a problem in that more dampening water than necessary is supplied.

Furthermore, the second conventional configuration has the problem that the entire device is complicated and expensive due to the use of a plunger pump, and even if the gate in the third conventional configuration is controlled by a pulse motor, the same problem arises. Another problem was that the entire device was complicated and costly.

An object of the present invention is to provide an offset printing machine that is capable of easily and reliably controlling the amount of dampening water supplied to each section in the width direction of an offset plate while the entire device is simple and low cost. The purpose of this company is to provide a dampening device.

[Means to solve the problem]

In order to achieve the above object, the characteristic configuration of the dampening device for an offset printing press according to the present invention is such that the inkphobic liquid supply device generates fine droplets using the inkphobic liquid in the water storage device. A plurality of sonic vibration elements are arranged in parallel in the pattern printing width direction of the offset plate, and the inkphobic liquid supply device includes a control device that separately controls the amount of the fine droplets generated by the ultrasonic vibration elements. Its functions and effects are as follows.

[Function] According to the characteristic configuration of the present invention described above, fine droplets generated by the ultrasonic vibration element are supplied to each portion of the offset plate in the pattern printing width direction. This ultrasonic vibration element can easily and accurately increase or decrease the amount of fine droplets generated by simply changing the amount of excitation power applied, without using a complicated and expensive device. therefore,
The control device for controlling the amount of fine droplets generated can be made very simple.

Moreover, since the ultrasonic vibration elements are low cost and compact, a large number of ultrasonic vibration elements are provided in detail in correspondence with each part in the pattern printing width direction of the offset plate, so that the ultrasonic vibration elements The distribution amount can be finely adjusted in the pattern printing width direction of the offset plate, and the entire apparatus can be made small and low cost.

Since these fine droplets are very small atomized droplets, the inkphobic liquid film formed at each part of the offset plate in the width direction of the image is uniform and thin. Therefore, the inkphobic liquid is not supplied in an amount greater than the required amount, and the pitch elongation in the printing direction of the printing paper at the positions corresponding to such portions can be reduced.

[Effects] As described above, according to the present invention, the amount of dampening water supplied to each part of the offset plate in the pattern printing width direction can be easily and reliably controlled, while the entire device is simple and low cost. It has become possible to provide a dampening device for an offset printing press that can perform the following steps.

By supplying exactly the required amount of dampening water to each section in the printing width direction of the offset plate, the pitch elongation of the printing paper in the printing direction is reduced for the printing paper as a whole, and the registration accuracy of printing is improved. Now you can improve your productivity.

Incidentally, when implementing the present invention, in addition to the characteristic configuration of the present invention described above, the configuration described below may be used.

First, the control device may be provided with a manual operation section that manually controls the amount of fine droplets generated by the ultrasonic vibration element.

According to this configuration, it is possible to quickly and manually finely adjust the amount of the inkphobic liquid to be supplied to each part of the offset plate in the pattern printing width direction, depending on the evaporation state of the inkphobic liquid, etc. You can control the supply amount of inkphobic liquid in the most reliable way! iii.

Second, the ultrasonic vibration elements are provided in correspondence to each part of the offset plate in the pattern printing width direction, and the control device is connected to a printing plate pattern area meter of the ink automatic presetting system. Using the pattern information obtained separately corresponding to the position corresponding to each part in the pattern printing width direction of the offset plate, the amount of the fine droplets generated by the ultrasonic vibration element can be determined by calculating the pattern printing width of the offset plate. A first control section may be provided that controls each section separately according to the area ratio of the non-picture section in each section in the direction.

According to this configuration, it is possible to match the divided digital ink fountain device in the ink automatic presetting system with the dampening device of the offset printing press of the present invention. That is, the amount of inkphobic liquid supplied to each part in the pattern printing width direction of the offset plate is:
Since it is automatically controlled by the first control section according to the ratio information of the non-picture area obtained from the printing plate pattern area meter of the auto presetting system, even non-experts can make adjustments quickly and accurately. It can be carried out.

Third, the amount of the fine droplets generated by the ultrasonic vibration element is controlled by the control device on the offset plate using information about the liquid film thickness on each part in the pattern printing width direction of the offset plate. A second control section may be provided that controls each part separately according to information on the liquid film thickness on each part in the pattern printing width direction.

According to this configuration, the excitation power applied to the ultrasonic vibrating element is controlled using information obtained by applying infrared rays or other devices for measuring the water film thickness on the printing plate, so that it is not affected by changes in temperature and humidity, etc. Therefore, a liquid film in the most appropriate state can be formed on each part of the offset plate in the pattern printing width direction.

Fourthly, the control device may include a third control section that controls the amount of fine droplets generated by the ultrasonic vibration element in accordance with the printing speed of the printing machine. According to this configuration, the consumption amount of the inkphobic liquid is approximately proportional to the rotation speed of the printing press, but ultrasonic vibration is Since the structure is configured to control the excitation power applied to the element, an appropriate amount of inkphobic liquid is supplied in response to changes in printing speed.

Fifth, the controller controls the amount of fine droplets generated by the ultrasonic vibration element based on the temperature and composition of the inkphobic liquid in the water storage device, and the temperature and composition of the inkphobic liquid in the dampening device of the offset printing machine. Or you may provide the 4th control part which controls according to the temperature and humidity of the vicinity.

According to this configuration, the surface tension of the ink-phobic/ink-phobic liquid changes depending on its composition, and the particle size and amount of fine water droplets generated by the ultrasonic vibration element also vary depending on the liquid temperature, surrounding humidity, and temperature. Also affected is the composition of the liquid,
Since the configuration is such that the excitation power is controlled by signals obtained from the environmental temperature and humidity measuring instruments, errors caused by these factors can be reduced.

Sixthly, the dampening roller that supplies the inkphobic liquid to the offset plate, and the ultrasonic vibration element that is provided in correspondence with each part in the pattern printing width direction of the offset plate, generate the The inkphobic liquid supply device may be provided with a transfer path that separately transfers the fine droplets to positions corresponding to the respective parts in the pattern printing width direction of the No. 411 offset plate on the dampening roller, and a transfer path for individually transporting the fine droplets generated by the ultrasonic vibration elements provided correspondingly to each part in the pattern printing width direction of the offset plate to each part in the pattern printing width direction of the offset plate; may be provided in the inkphobic liquid supply device.

According to this configuration, interference between the fine droplets generated by each of the ultrasonic vibration elements is prevented, and the fine droplets are applied to each part in the pattern printing width direction of the offset plate corresponding to each of the ultrasonic vibration elements. Droplets can be transferred individually with greater precision.

Seventhly, the inkphobic liquid supply device may be provided with a blower device that transfers the fine droplets generated by the ultrasonic vibration element to the outlet of the transfer path of the offset plate cylinder.

According to this configuration, the fine droplets generated by the ultrasonic vibration element can be more reliably transferred to the exit side of the transfer path.

Eighthly, the transfer path may be bent.

According to this configuration, among the fine droplets generated by the ultrasonic vibration element, those with a large particle size can be removed by colliding with the bending part of the transfer path, thereby forming a more uniform water film. Only fine droplets with small particle sizes can be selectively transferred to the exit of the transfer path.

[Example] Next, an example will be shown with reference to FIGS. 1 to 6.

Figures 1 and 2 show the dampening device (1) of an offset printing press.
) is a diagram showing the structure in the vicinity. In the figure, (2) is a plate cylinder that is equipped with an offset plate (2b) and rotates around a plate cylinder axis (2a), and this plate cylinder (2) is attached to a dampening roller ( 3) and the ink roller (4) of the split digital ink fountain device (5) are brought into rolling contact. The dampening roller shaft (3) is the rotation center of the dampening roller (3).
a) and the ink roller shaft (4a), which is the center of rotation of the ink roller (4), are arranged parallel to the plate cylinder axis (2a), so that n
The pattern printing width (W) of the offset plate (2b) divided into
) direction of the printing surface (hereinafter referred to as the "plate division section") (^1) to (An), the dampening roller (
3) upper dampening roller sections (B1) to (Bn);
Ink roller section (C1) on ink roller (4)
) to (Cn) correspond to each other. As will be described later, the divided digital ink pot device (5) and the dampening device (1) provide each plate sorting section with an appropriate amount of ink and an appropriate amount of dampening water, which is an inkphobic liquid. Supplied.

FIG. 3 shows the display of the printing plate pattern area ratio meter (DEMIA) in the ink auto-presetting system. The horizontal axis (&4) corresponds to the pattern printing width (W), and the plate classification display (a1) divided into n pieces in the horizontal axis (W) direction.
) to (an) are the respective edition division sections (A1) to (An
) corresponds to each separately.

This display shows the area ratios (01) to (Dn) of each pattern area in each plate division display (a1) to (an) toward the top of the vertical axis (p) toward the pattern printing pinch (that is,
Area ratio of the drawing area. ) is a bar graph displaying. Therefore, the values of the non-picture area ratios (N1) to (Nn) (that is, the area ratio of the non-print parts) in each of the plate division sections (81) to (80) are 100% of the picture area ratio. is displayed from the horizontal axis downward to the vertical axis (p).

As shown in FIGS. 4 and 5, each pattern area ratio (D1) to (
On) information is manually input to the ink key remote control device in the ink auto presetting system and used to control the divided digital ink fountain device (5).

The divided digital ink fountain device (5) includes the respective plate sorting sections (
There are n ink fountain units (U1) to (IUn) respectively provided corresponding to A1) to (An).

Each of these ink fountain units (101) to (fun)
In this example, a piano key (6) rotatable about a key shaft (6a) is opposed to an ink source roller (7). Although not shown, a plurality of transfer rollers are provided between the ink source roller (7) and the ink roller (4) to transfer the ink (1) from the former to the latter.

Each of the ink fountain units (101) to (IU
n) is a deceleration motor mechanism (
9), the piano key (6) is swung with the extrusion screw (10) moving forward and backward, and the ink source roller (7)
By increasing or decreasing the gap (l,) between the ink roller (4) and the piano key (6), the offset plate (
2b), the amount of ink supplied to each plate sorting section (A1) to (An) is adjusted separately. The arithmetic device (8) outputs the non-picture area ratios (N1) to (Nn) using information on the respective pattern area ratios (D1) to (Dn) obtained from the ink key remote control device, and , rotate the potentiometer (11). Then, the given non-picture area ratios (N1) to (N
By configuring the deceleration motor mechanism (9) to move the extrusion screw (10) forward and backward by rotation in accordance with n), thereby adjusting the gap (L), the area ratio of each picture area (D1) can be adjusted. An amount of ink corresponding to (Dn) is applied to the plate dividing portions (A1) to (Dn) of the offset plate (2b).
An) It is possible to supply. In addition, the arithmetic device (
8) It is also possible to make fine adjustments manually. Further, the opening degree of the gap (L) is indicated by the rotation angle of the potentiometer (11).

As shown in FIGS. 1 and 2, the dampening device (1) includes a water storage device (12) that stores the dampening water, and a water storage device (12) that stores the dampening water in the offset plate (2b). ) is an inkphobic liquid supply device (1).
It consists of 3〉. Moreover, this dampening water supply device (13) is connected to the dampening roller (3), the air blower (14), and each plate dividing section (A1) to (An) of the offset plate (2b).
It consists of dampening water supply units (DU1) to (Dun) provided correspondingly.

As shown in FIG. 1, the water storage device (12) includes a water layer that stores the dampening water (F) and a water storage tank (16) that supplies the dampening water to the water tank (15). And the aquarium (
In order to keep the water level (H) of 15〉 at a constant value, a ball float (17a) that moves up and down as the water level (H) changes.
A pole tap device (17) equipped with a pole tap device (17) is provided at the outlet (16a) of the water storage tank (16). The water tank (15) is provided in such a manner that the bottom (15a) of the water tank (15) is located parallel to the dampening roller shaft (3a).

The dampening water supply unit l-(DU1) to (nun) includes an ultrasonic vibration element (18) that vibrates the liquid surface (21) of the water tank (15) to generate fine droplets, and An excitation power device (19) constituting a part of a control device that drives and controls the vibration element (18) and the ultrasonic vibration element (1
8) for transferring the fine droplets generated by step 8) to the dampening roller sections (B1) to (Bn) on the dampening roller (3). Further, the excitation power device (19
) is equipped with an output adjustment circuit that adjusts the output excitation power of this device.

The ultrasonic vibration element (18) is connected to the excitation power device (1
The vibrator is violently vibrated by the excitation power of the resonance frequency given from 9), and the ultrasonic wave is propagated into the damp water. Then, the liquid surface (21) of the water tank (15) is violently vibrated by the radiated sound pressure, and droplets are ejected in a columnar manner onto this liquid surface (21). & Generate mist-like fine droplets (f2) in a turbulent cloud around the droplet (f1). The amount of these fine droplets generated depends on the distance from the ultrasonic vibration element (18) to the liquid surface (21) and the amount of excitation power. Therefore, each of the dampening water supply units l-(D[11) to (
Each ultrasonic vibrating element (I8) in the liquid surface (DIIn) is adjusted so that the amount of minute droplets generated by each ultrasonic vibrating element (18) is the same by constant electric power.
21) is provided at the bottom (15a) of the water tank (15) at a constant distance from the water tank (15). That is, in conjunction with the stabilization of the water level (H) by the pole tap device (17), the amount of fine mist droplets generated by each of the ultrasonic vibration elements (18) can be controlled by the excitation power device. It is configured to be uniquely and accurately determined by the power given from (I9).

The blower device (14) is a blower (22) with a fan.
), and the wind generated from the blower (22) is transferred to each of the transfer paths (
20) consists of a blower duct l-(23). The low-pressure micro-air blowing by this blower (22) transports a group of fine mist droplets generated around the columnar droplets on the liquid surface (21) where the ultrasonic vibration element (18) is located. Road (
20) to the upper side.

On the liquid surface (21) where the ultrasonic vibration element (18) is located, a wide duct l-(24) is placed in a state surrounding the atomized fine droplets generated around the columnar droplets. The ends of the wide duct 1-(24) have an outlet (20a) having a constricted portion at the other end facing the dampening roller (3). By partitioning the inside of the duct (24), the fine liquid generated by the ultrasonic vibration elements (18>) provided correspondingly to each plate division section (A1) to (An) of the offset plate (2b) Droplets are transferred from the outlet (20a) to the dampening roller sections (B1) to (2) on the dampening roller (3).
The transfer path (20) is formed to transfer the materials separately to the Bn).

When the frequency of the excitation power is 1.6 MHz, the particle size of the fine droplets generated by the ultrasonic vibration element (18) is as follows:
The droplets are distributed around 6 microns, and relatively large droplets are also included. Therefore, a pair of collection plates (26) are alternately protruded into the wide duct (24) to
0) is bent and the large droplets (f3) of the fine droplets are made to collide with the collection plate (26).
By collecting, only the mist-like fine droplets with small particle sizes that are not collected are transferred to the outlet (20a) side.

The control device includes a manual operation section and first to fourth
It further includes a control section.

Then, the output power of the excitation power device (19) is increased or decreased by an output adjustment circuit that adjusts the output according to these manual operation units and the first to fourth control units, and the atomized fine particles generated by the ultrasonic vibration element (18) are Control the amount of droplets generated.

First, the manual operation section observes the water film condition on the printing plate, inspects the halftone dots on the printed matter, etc., adjusts the output adjustment circuit only manually, and displays the output value on a display section equipped with so-called LEDs. It is something.

This display section displays an LED row formed by arranging a plurality of LEDs in the vertical direction in each plate division section (2b) of the offset plate (2b).
A plurality of rows are arranged in parallel in the horizontal direction corresponding to A1) to (An), and these L[EDs are configured to blink in sequence according to the output value. Therefore, the operator instantly
You can see the supply amount distribution of dampening water in the pattern printing width direction. Further, the position of the lit LED can be used as a guide for increasing or decreasing the amount of dampening water supplied.

Note that the display section may be configured to display a manual adjustment amount instead of being configured to display the output value of the output adjustment circuit.

Next, as shown in FIG. 5, the first control section generates a voltage signal obtained by the output resistance value of the potentiometer (11) in each of the dampening water supply units I-(001) to (nun). It is used for control. That is, dampening water is supplied to each of the plate sorting sections (A1) to (An) according to the non-picture area ratios (N1) to (Nn) in each of the plate sorting sections (81) to (An). Increase or decrease the amount of each separately. In addition, since the offset ink contains a small amount of water, in this first control section, from the values based on the non-picture area ratios (N1) to (Nn), A value that corrects the moisture content in the ink is reduced.

The second control section is a section that is controlled separately based on information from an infrared device or other liquid film thickness measuring device. This measuring device is a device that measures the thickness of the liquid film on the plate by quantifying the reflected light that hits the plate from the oblique front of the plate and is reflected. Then, the excitation power of the vibrating element is controlled using this digitized measurement value. The liquid film thickness is measured at each plate section (A) on the offset plate (2b).
1) to (An), and the corresponding pre-ultrasonic vibration elements (18) are controlled separately, so that the most appropriate amount of dampening water is applied to each section. (
A1) to (An).

As shown in FIG. 5, the third control section controls the plate cylinder axis (
Control is performed using a voltage signal output from a rotary generator (tacho generator) linked to the rotation of 2a). That is, the relationship between the rotational speed of the plate cylinder shaft (2a), which indicates the printing speed, and the required amount of dampening water is approximately proportional, as shown in FIG. Therefore, the manual operation section 1. The second control unit automatically increases or decreases the amount of dampening water supplied to each plate sorting unit (A1) to (An) that is individually controlled by a second control unit etc. according to the printing speed, Even if the printing speed changes, each plate division section (A1
) to (An) are always kept at appropriate values. In addition, each edition division section (A
The above-mentioned divided digital ink fountain device (5) is used so that the amount of ink supplied to 1) to (An) increases as the ink printing speed increases.

The fourth control section 4Tj corrects the excitation power depending on the temperature and humidity around the printing machine.

That is, since the evaporation state of the dampening water changes depending on the temperature and humidity of the surrounding air, the excitation power is adjusted and corrected using a temperature and humidity measuring device. Further, depending on the composition of the dampening solution, the amount of fine water droplets generated for the same electric power varies greatly. For example, addition of alcohol lowers the surface tension and makes the water droplets finer, increasing the amount of generated water. Since the addition of a surfactant also has a large effect, the conditions for controlling the excitation power should be changed depending on these conditions.

Further, the ultrasonic vibration element (18) can be of the type used in ultrasonic humidifiers, etc.
l u) The whole can be produced at low cost. Further, according to the present invention, the dampening water in the water storage device (12) is not contaminated by the ink on the offset plate (2b), so there is an advantage that maintenance can be reduced.

[Another example] Next, another example will be listed.

(B) In the above-described embodiment, the exit of the transfer path (20) (
A dampening roller (3) is placed between the plate cylinder (20a) and the plate cylinder (2).
), but the outlet (20a) of the transfer path (20) may be directly opposed to the plate cylinder (2) without providing this dampening roller (3). With this configuration, it is possible to reduce the amount of maintenance required to prevent contamination of the dampening roller (3) with ink on the plate cylinder (2).

(b) In the above-described embodiment, the transfer path (20) was provided between the water tank (15) and the dampening roller (3). ) may be used to transfer the ridge 11il droplets generated on the liquid surface (21) to the dampening roller (3). Alternatively, the liquid level (21) of the water tank (15) may be placed close to the dampening roller (3) or the plate cylinder (2) without providing both the transfer path (20> and the blower device (14)). .

(c) Not limited to the above embodiment, each ultrasonic vibration element (18) in the humidified water supply unit (DU1) to (Dun) is set at a distance from the liquid level (21) of the water tank (15). It may be configured such that the distances are different from each other and the difference in distance is corrected in controlling each of the excitation power devices (19).

(d) In the above embodiment, the ratio information of the non-picture portion used in the control device of the dampening water device is obtained based on the potentiometer (11) of the divided digital ink fountain device (5). However, the information on each non-picture area ratio (N1) to (Nn) in the printing plate pattern area ratio meter may be directly used in the control device of the dampening water device as ratio information of the non-picture part. . Alternatively, each picture area ratio (N1) to (Nn) obtained by subtracting each picture part area (Di) to (Dn) in the printing plate picture area ratio meter from 100% may be used.

K) In the above embodiment, the ratio information of the non-picture portion used in the control device of the dampening water device is obtained based on the potentiometer (11) of the divided digital ink fountain device (5). is the potentiometer (11
) may be configured to obtain similar information through electrical processing.

(f) In the above-mentioned embodiment, the ink fountain unit)
The numbers of (Il1) to (IUn) and the number of the dampening water supply units l-(DU1) to (Dun) were made the same, but the ink fountain units (IIJ1) to (run)
The number of the dampening water supply units 1-(DIl1) to (DUn) may be smaller than the number of dampening water supplies 1-(DIl1) to (DUn), or vice versa.

(g) In the above-described embodiment, the input information of the excitation power device (19), which is a control device, is the output resistance value of the potentiometer (I1), which is first information, and the output resistance value of the rotary generator, which is second information. Although the output voltage signal was used, information on the surface tension value obtained from a surface tension measuring device that measures the surface tension of the dampening solution may be further used as the third information.

(H) The excitation power device may be configured to be controlled only by the manual operation section without providing the first to fourth control sections described above. The entire device constructed from this can be made the simplest and lowest cost.

Gate If the liquid film thickness measuring device of the second control section is configured to be able to measure the liquid film thickness even while the plate cylinder is rotating, the first control section may not be provided.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal cross-sectional view of a dampening device of an offset printing press, Fig. 2 is a cross-sectional view taken along line nn of Fig. 1, and Fig. 3 is a printing plate image area ratio. Diagram showing the display of the meter, No. 4
The figure is a longitudinal sectional view of the divided digital ink fountain device, FIG. 5 is a block diagram, and FIG. 6 is a diagram showing the relationship between the number of rotations of the plate cylinder shaft and the required amount of dampening water. (2b)...Offset version, (12)...
... Water storage device, (13) ... Inkphobic liquid supply device, (18) ... Ultrasonic vibration element, (W)
...Picture printing width, (19)...Control device.

Claims (1)

[Claims] 1. A water storage device (12) for storing an inkphobic liquid that can adhere to a non-picture area of an offset plate (2b), and a water storage device (12) for storing an inkphobic liquid that can be attached to a non-picture area of an offset plate (2b); Edition (
2b); and an inkphobic liquid supply device (13) for supplying an inkphobic liquid to the inkphobic liquid supply device (13). The ultrasonic vibration element (18) that generates fine droplets using an ink liquid is connected to the offset plate (2b
) are arranged in parallel in the pattern printing width (W) direction, and the inkphobic liquid supply device (13) is configured to individually control the amount of the fine droplets generated by the ultrasonic vibration element (18). A dampening device for an offset printing press that is equipped with a control device. 2. The dampening device for an offset printing press according to claim 1, wherein the control device is provided with a manual operation section for manually controlling the amount of the fine droplets generated by the ultrasonic vibration element (18). 3. The ultrasonic vibration element (18) is connected to the offset plate (
2b) respectively corresponding to each part (A1) to (An) in the pattern printing width (W) direction, and the control device is connected to the printing plate pattern area meter of the ink auto presetting system to the offset plate. (2b) Each part (A1) to (An
) The pattern information obtained separately corresponding to the position corresponding to (
Using D1) to (Dn), (N1) to (Nn),
The amount of the fine droplets generated by the ultrasonic vibration element (18) is calculated as the non-picture area ratio (N1) of each part (A1) to (An) in the pattern printing width (W) direction of the offset plate (2b). 3. The dampening device for an offset printing press according to claim 1, further comprising a first control unit that controls each of the damping units according to Nn. 4. The ultrasonic vibration element (18) is connected to the offset plate (
2b) respectively corresponding to each part (A1) to (An) in the pattern printing width (W) direction of the offset plate (2b); Using the information on the liquid film thickness on each part (A1) to (An), the amount of the fine droplets generated by the ultrasonic vibrating element (18) is determined by the pattern printing width (W) of the offset plate (2b). 3. The dampening device for an offset printing press according to claim 1, further comprising a second control section that controls each part according to the thickness of the liquid film on each of the parts (A1) to (An) in the direction. . 5. Any one of claims 1 to 4, wherein the control device is provided with a third control section that controls the amount of fine droplets generated by the ultrasonic vibration element (18) in accordance with the printing speed of the printing machine. A dampening device for an offset printing press described in . 6. The control device is configured to control the amount of fine droplets generated by the ultrasonic vibration element (18) based on the temperature and composition of the inkphobic liquid in the water storage device (12) and the humidity of the offset printing machine. 6. The dampening device for an offset printing press according to claim 1, further comprising a fourth control section that controls the temperature and humidity in or near the dampening device. 7. The ultrasonic vibration element (18) is connected to the offset plate (
a dampening roller (3) that is provided corresponding to each part (A1) to (An) in the pattern printing width (W) direction of 2b) and supplies the inkphobic liquid to the offset plate (2b); Said offset version (2b)
The fine droplets generated by the ultrasonic vibration elements (18), which are provided correspondingly to each of the parts (A1) to (An) in the direction of the pattern printing width (W), are applied onto the dampening roller (3). The pattern printing width of the offset plate (2b) (
The inkphobic liquid supply device (13) is provided with a transfer path (20) for transferring the liquid to positions (B1) to (Bn) corresponding to the respective parts (A1) to (An) in the direction W). A dampening device for an offset printing press according to any one of claims 1 to 6. 8. The ultrasonic vibration element (18) is connected to the offset plate (
2b) in the pattern printing width (W) direction, and each part (A1) to (An) in the pattern printing width (W) direction of the offset plate (2b). ) The fine droplets generated by the ultrasonic vibration elements (18) provided in correspondence with each other are applied to the pattern printing width (W) of the offset plate (2b).
7. Offset printing according to any one of claims 1 to 6, wherein the inkphobic liquid supply device (13) is provided with a transfer path (20) for transferring the liquid separately to each of the parts (A1) to (An) in the ) direction. Machine dampening device. 9. The fine droplets generated by the ultrasonic vibration element (18) are transferred to the transfer path (2) on the offset plate (2b) side.
9. The dampening device for an offset printing press according to claim 7, wherein the inkphobic liquid supply device (13) is provided with a blower device (14) for transporting the ink-phobic liquid to the outlet (20a) of the ink-phobic liquid. 10. The dampening device for an offset printing press according to any one of claims 7 to 9, wherein the transfer path (20) is bent.