JP2002248738A - Method for preliminarily supplying ink and system, controller for printer, and server - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily regulate a thickness of an ink film formed on an ink roller group by preliminarily supplying the ink in response to printing conditions in a method for preliminarily supplying the ink and a system. SOLUTION: A method for preliminarily supplying the ink comprises the steps of selecting at least two different values of a specific control parameter for deciding the thickness of the ink film formed on the ink roller group 6 of the control parameter of the printer, and trially printing by using a reference press plate 19 having a predetermined design areal ratio with respective selected values as temporary set value of the specific control parameter under specific printing conditions (e.g. a sheet type, an ink type, a dampening method and the like). The method further comprises the steps of subsequently measuring density values of printed matters 25, 26 obtained by the trial printing for the respective selected values, and calculating the value of the specific control parameter for realizing a target density value based on the respective selected values and the density values of the printed matters corresponding to the selected values. The method also comprises the step of preliminarily supplying the ink with the calculated value as the specific control parameter under the specific printing conditions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for pre-supplying ink for forming an ink film on an ink roller group prior to the start of printing in a printing machine such as an offset printing machine.

[0002]

2. Description of the Related Art FIG. 9 is a schematic diagram showing a configuration of a general ink supply unit in an offset printing press. As shown in FIG. 9, the ink supply unit of the offset printing press includes, in order from the top, an ink fountain 2 for storing ink 1, an ink source roller 3, a call roller 5, and a plurality of ink kneading rollers. An ink roller group 6 is provided, and a plate cylinder 8 is arranged near the ink application roller 7 located at the most downstream of the ink roller group 6. Then, ink 1 in ink fountain 2
Is transferred from the surface of the ink source roller 3 to the ink roller group 6 via the call roller 5, and after being kneaded appropriately in the ink roller group 6, is wound around the surface of the plate cylinder 8 via the ink application roller 7. The printing plate 9 is supplied. The ink fountain 2 includes a surface of an ink source roller 3, a plurality of ink keys 4 arranged side by side in the apparatus width direction, and a pair of left and right side plates (not shown). The ink keys 4 can independently adjust the degree of opening (the distance between the front end and the surface of the ink source roller 3). By adjusting the degree of opening of the ink keys 4, the ink supplied from the ink fountain 2 can be adjusted. The amount can be adjusted in the device width direction (left-right direction).

Normally, the amount of ink supplied from the ink fountain 2 is adjusted in accordance with the left-right distribution of the pattern area ratio of the printing plate 9,
At the time of steady printing, the supply amount of ink from the ink fountain 2 and the ink consumption amount of the plate surface are balanced. At this time, in the ink roller group 6, as shown in FIG. 10, there is an ink film thickness distribution that becomes gradually thinner from upstream to downstream. The ink film formed on each ink roller at this time is roughly composed of two types of elements as shown in FIG. 11, one of which has a film thickness depending on the pattern area ratio of the printing plate 9. The ink film (part A in FIG. 11) has the minimum thickness required for the required printing regardless of the pattern area ratio, that is, even if the pattern area ratio is zero. (B part in FIG. 11).

Normally, test printing for adjusting the color tone (density value of each color) is performed before the actual printing. However, as in the case of cleaning the ink rollers after ink replacement, the ink rollers 6 If the test printing is started from a state in which the ink is not stored at all, the color tone is not stabilized until the ink is accumulated in the ink roller group 6, and during that time, a lot of waste paper is generated. Therefore, prior to the start of printing, an ink pre-supply has been conventionally provided in which an appropriate amount of ink is supplied to the ink roller group 6 so that an ink film having a minimum film thickness necessary for printing is formed on the ink roller group 6. It was done.

For example, in the technique disclosed in Japanese Patent Application Laid-Open No. S60-101048, the opening of the ink key 4 and the opening of the ink feeding roller 5 are controlled while the printing machine is idled while the ink applying roller 7 and the plate cylinder 8 are separated. By setting the number of calls and the like to predetermined values (set values by the user) and supplying a predetermined amount of ink to the ink roller group 6, an ink film thickness distribution having a uniform thickness can be obtained in all portions of the ink roller group 6. It is formed.

In the technique disclosed in Japanese Patent Application Laid-Open No. Hei 10-16193, the opening degree of the ink key 4, the amount of rotation of the ink source roller 3, and the number of times the ink feeding roller 5 is called are each determined while the printing press is operating. By supplying a predetermined amount of ink to the ink roller group 6 by setting the value to a value (set value by the user), the ink roller group 6 is formed to have an ink film thickness distribution that becomes thinner from upstream to downstream and thus becomes thinner. I have.

Further, according to the technique disclosed in Japanese Patent Application Laid-Open No. H11-188848, a minimum ink film thickness distribution necessary for printing such that the ink roller group 6 becomes thinner from upstream to downstream is formed. Measure the density value of the sample printed matter, compare the measured density value with the reference density value predetermined for the minimum ink film thickness required for printing, and compare the measured density value with the reference density value. Do not match, the number of ink feedings of the ink feeding roller 5 is increased or decreased according to the density difference.

As described above, various methods have been proposed for the preliminary supply of ink.

[0009]

Incidentally, the film thickness of the ink film on each ink kneading roller required at the time of printing depends not only on the pattern area ratio of the printing plate but also on the ink type, paper type, dampening method and the like. It also depends on the printing conditions. In other words, even if the pattern area ratio is the same, if the printing conditions are different, the density value of each color of the printed matter will be different. The same applies to the film thickness of the ink film formed by the preliminary supply of ink performed before the start of printing (the minimum film thickness required for printing). In order to shorten the length, improve productivity and reduce waste paper, it is desirable to set the film thickness in consideration of printing conditions.

[0010] In this regard, Japanese Patent Application Laid-Open No. Sho 60-101 describes the above.
In the technology disclosed in Japanese Patent Application Laid-Open No. 048 and Japanese Patent Application Laid-Open No. H10-16193, the amount of ink supplied at the time of preliminary ink supply is adjusted by the user by setting control parameters such as the ink key opening degree. It is necessary to set control parameters suitable for each printing condition by itself. However, since printing conditions such as paper type and ink type are various, it is almost impossible for the user to grasp all the setting values of the control parameters that are optimal for each printing condition. Therefore, in these conventional technologies, in order to realize the minimum film thickness in consideration of the printing conditions, it is necessary to rely on the experience and intuition of the user, and it is difficult to realize the optimum film thickness with high accuracy. In addition, the adjustment requires much labor.

In the technique disclosed in Japanese Patent Application Laid-Open No. H11-188848, the ink supply amount during the preliminary ink supply is determined by the number of ink calls according to the deviation between the measured density value of the sample print and a predetermined reference density value. Is automatically adjusted by the automatic setting described above, but the adjustment is based only on the deviation between the measured density value and the reference density value, and is not adjusted in consideration of the printing conditions at that time. Therefore,
Even in this conventional technique, when the printing conditions change, the minimum film thickness suitable for the printing conditions cannot be realized, and the target printing density may not be obtained.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has been made so that the thickness of an ink film formed on an ink roller group by preliminary supply of ink can be easily adjusted according to printing conditions. An object of the present invention is to provide an ink preliminary supply method and an ink preliminary supply system, and a control device and a server for a printing press for realizing the system using an information communication network.

[0013]

In order to achieve the above-mentioned object, the ink pre-supply method of the present invention is characterized in that the ink is pre-supplied to an ink roller group of a printing machine in the following procedure. That is, at least two different values are selected for specific control parameters for determining the thickness of the ink film formed on the ink roller group among the control parameters of the printing press, and specific printing conditions (for example, paper type, (Ink type, damping method, etc.), a reference printing plate having a predetermined pattern area ratio is used to perform test printing with the above selected values as temporary setting values of the specific control parameters. Subsequently, the density values of the printed matter obtained by the test printing for each of the selected values are measured, and a target density value is realized based on each of the selected values and the density value of the printed matter corresponding to each of the selected values. Is calculated for the specific control parameter. And
The preliminary supply of ink is performed using the calculated value as the set value of the specific control parameter under the specific printing condition.

By performing the preliminary supply of ink in this manner, the thickness of the ink film formed on the ink roller group can be easily adjusted according to the printing conditions. Further, according to the above-described method, an ink film having an arbitrary thickness can be formed on the ink roller group by changing the pattern area ratio of the reference printing plate. For example, if the pattern area ratio of the reference printing plate is substantially zero, an ink film having a minimum film thickness (minimum film thickness necessary for printing) suitable for printing conditions can be formed on the ink roller group.

In the above ink pre-supply method, preferably, the set value of the specific control parameter and the density of the printed material under the specific printing conditions are based on the selected values and the density value of the printed material corresponding to the selected values. A correlation with a value is derived, and the derived correlation is stored in a database in association with the specific printing condition. At the start of printing, the database is searched using the current printing condition as a search condition, and when the correlation corresponding to the current printing condition is stored in the database, the target density value and the correlation are stored in the database. Based on the correlation corresponding to the current printing condition, the set value of the specific control parameter is calculated to perform preliminary supply of ink, and the ink roller group is provided with an ink film having a film thickness suitable for the current printing condition. Let it form. With this, for the printing condition for which the correlation has been once obtained, the setting value of the specific control parameter according to the printing condition can be obtained only by determining the target density value, so that it is not necessary to perform test printing again, It is possible to further improve productivity and further reduce waste paper.

More preferably, the correlation is:
The relationship between each of the selected values and the density value of the printed matter corresponding to each of the selected values is derived by approximating the relationship with a straight line. By deriving the above correlation using the linear approximation in this way, it is possible to reduce the calculation load required for derivation. When the linear approximation is used, the above correlation can be derived if the density values of the printed matter corresponding to two different specific control parameters are measured. Generation can be suppressed.

It is preferable to use the amount of ink supplied to the ink roller group as the specific control parameter.
In particular, in the case of a printing machine having an ink fountain, it is preferable to use the amount of ink supplied from the ink fountain to the ink source roller. This makes it possible to easily control the thickness of the ink film formed on the ink roller group. In addition,
The amount of ink supplied from the ink fountain to the ink source roller is determined by a plurality of control parameters such as the opening of the ink key, the rotation amount of the ink source roller, and the number of times the ink feeding roller is called. It is practically preferable to change only the parameters, for example, the ink key opening, and to fix other control parameters.

The present invention also provides a system for realizing the above-described ink pre-supply method. This system is an ink pre-supply system for pre-supplying ink to the ink rollers to form an ink film on the ink rollers of the printing press prior to the start of printing.
It is characterized by having the following components. That is, input means for inputting information necessary for the operation of the printing press, a database, search means for searching the database, calculation means for calculating set values of specific control parameters, and preliminary supply of ink to the ink roller group. There is provided control means for controlling the printing press.

The database includes a set value of the specific control parameter for determining a film thickness of the ink film formed on the ink roller group among the control parameters of the printing press, and a predetermined pattern area ratio based on the set value. The correlation with the density value of the printed matter when printing is performed using the reference printing plate is stored for each printing condition (for example, paper type, ink type, dampening method, etc.), and the search means includes: When a printing condition is input via the input means, the correlation corresponding to the input printing condition is searched from the database using the input printing condition as a search condition. Then, the calculating unit is configured to execute the specific control corresponding to the input target density value based on the correlation searched from the database by the searching unit and the target density value input via the input unit. The control unit controls the printing press to set the specific control parameter to the set value calculated by the calculation unit and preliminarily supply ink to the ink roller group. With this, the user can easily and accurately adjust the thickness of the ink film formed on the ink roller group according to the printing conditions only by inputting the printing conditions and the target density. In addition, it is possible to greatly reduce the time required for preparation before starting the actual printing, thereby improving productivity and reducing waste paper.

In the above ink preliminary supply system,
Preferably, a density measuring unit for measuring the density value of the printed matter,
A correlation deriving unit and a registering unit are provided as further components. Then, under a specific printing condition, at least two different values for the specific control parameter are selected, and when test printing using the reference printing plate is performed using each selected value as a temporary setting value, Based on the selected values and the density value of the printed matter corresponding to the selected values measured by the density measuring means, the correlation deriving means sets the set value of the specific control parameter under the specific printing conditions and the density of the printed matter. A correlation with a value is derived, and the derived correlation is registered in the database by the registration unit in correspondence with the specific printing condition. Thus, with respect to the printing conditions for which the correlation has been once obtained, it is possible to obtain the set values of the specific control parameters according to the printing conditions only by determining the target density value.

More preferably, the correlation deriving means is configured to derive the correlation by approximating the relationship between each of the selected values and the density value of the printed material corresponding to each of the selected values with a straight line. I do. By deriving the above correlation using the linear approximation in this way, it is possible to reduce the calculation load required for derivation. In the case of using the linear approximation, if the density values of the printed matter corresponding to two different specific control parameters are measured, the above correlation (in this case, for example, the slope and the Y intercept of the straight line in the XY orthogonal coordinate system) is derived. Therefore, the number of test printings can be minimized to suppress the occurrence of waste paper.

Further, the above-mentioned ink preliminary supply system comprises:
It may be configured as a server-client system including a server and a client terminal connected via the information communication network. In this case, it is preferable that at least the database is provided in the server. With such a configuration, the database can be shared by a plurality of users.

The present invention further provides a control device and a server for the above-mentioned system. The control device for a printing press provided by the present invention includes a set value of a specific control parameter for determining a film thickness of an ink film formed on an ink roller group among control parameters of the printing press, and Printing that can be connected via an information communication network to a server equipped with a database that stores, for each printing condition, a correlation between the density value of a printed material and printing when a printing is performed using a reference printing plate having a predetermined pattern area ratio. A control device for a machine, comprising the following components. That is, input means for inputting information necessary for operation of the printing press, and when printing conditions are input via the input means, information on the input printing conditions is transmitted to the server via the information communication network. Transmitting means for transmitting, and receiving means for receiving, from the server via the information communication network, information on the correlation corresponding to the printing condition, obtained by searching the database on the server side; Calculating means for calculating a setting value of the specific control parameter corresponding to the input target density value based on the correlation information received by the means and the target density value input via the input means; Control means for setting the specific control parameter to the set value calculated by the calculation means and controlling the printing press to preliminarily supply ink to the ink roller group. . By receiving the information necessary for the preliminary supply of ink (the information relating to the correlation) from the server via the information communication network in this way, the user can previously set the specific control parameter set value and the set value. It is not necessary to know the correlation with the density value of the corresponding printed matter, and the productivity is further improved.

A server provided by the present invention is a server that can be connected to a control device of a printing press via an information communication network, and is characterized by including the following components. That is, among the control parameters of the printing press, based on the set values of specific control parameters correlated with the film thickness of the ink film formed on the ink roller group and the reference printing plate having a predetermined pattern area ratio based on the set values. A database in which the correlation with the density value of the printed matter when printing is performed using each printing condition, and the reception that receives information on the printing conditions and information on the target density from the control device via the information communication network. Means, a print condition received by the receiving means as a search condition, a search means for searching the database for the correlation matching the search condition, and the correlation searched from the database by the search means, Calculating means for calculating a set value of the specific control parameter corresponding to the target density value based on the target density value received by the receiving means; The set value of the specific control parameter calculated by the stage is transmitted to the control device via the information communication network as a set value for preliminary supply of ink to the ink roller group performed before printing of the printing press. Transmission means for transmitting. By providing the server with such a function, the data of the database can be shared between users, and the load on the control device can be reduced.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a schematic configuration of an ink preliminary supply system according to the first embodiment. Here, a configuration in a case where the present invention is applied to the conventional ink pre-supply system of the offset printing press shown in FIG. 8 is shown, and the same parts as those in the related art are denoted by the same reference numerals. .

As shown in FIG. 1, the ink pre-supply system 10 of this embodiment comprises a printing press control device 11, a control parameter setting device 12, and a color tone management device 13. The printing press control device 11 is a device that comprehensively controls the operation of the entire printing press. The printing press control device 11 includes an ink fountain control unit 15, a printing press driving unit 16, a roller control unit 17, and an ink reserve supply control unit 18 as functional elements. ing. Describing each functional element, the ink fountain controller 15 has a function of controlling the opening of the ink key 4 constituting the ink fountain 2. The printing press drive section 16 has a function of controlling the driving state of the printing press main body including the plate cylinder 8. Further, the roller control unit 17 has a function of controlling the operation state of each roller constituting the ink supply unit. Specifically, it controls the rotation speed of the ink source roller 3, the number of times the ink feeding roller 5 is called, the attachment / detachment of the ink applying roller 7 to the plate cylinder 8, and the like. The ink pre-supply control unit 18 has a function of controlling the operations of the ink fountain control unit 15, the printing press driving unit 16 and the roller control unit 17 to cause the printing press to perform the ink pre-supply operation. . That is, the preliminary ink supply control unit 18 functions as control means according to the preliminary ink supply system of the present invention.

Here, the outline of the ink pre-supply operation of the printing press by the ink pre-supply control section 18 will be described. First, the ink pre-supply control section 18 sends a command to the roller control section 17 to control the ink application roller 7. The plate cylinder 8 is detached. Then, a command is sent to the ink fountain controller 15 to set the opening of all the ink keys 4 to the opening set by the control parameter setting device 12 described later, and a command is sent again to the roller controller 17 to set the ink source. The roller 3 is rotated at a predetermined rotation speed, and the ink feeding roller 5 is called up a predetermined number of times. At this time, a command is sent to the printing press drive unit 16 to operate the printing press at a predetermined speed. As a result, an ink film having a uniform thickness is formed on the ink roller group 6 according to the opening of the ink key 4 set by the control parameter setting device 12.

Here, the opening degree of the ink key 4 is a control parameter (specific control parameter) for controlling the thickness of the ink film. The thickness of the ink film can also be controlled by other control parameters such as controlling the amount of ink supplied from the ink fountain 2 to the ink roller group 6. It is also possible to control the thickness of the ink film by a plurality of control parameters instead of a single control parameter. However, in order to simplify the control, the other control parameters are fixed and the ink key is controlled. The thickness of the ink film is controlled only by the opening degree of 4.

By the preliminary supply of ink, the ink roller group 6
Is usually adjusted to the minimum thickness required for printing (thickness independent of the pattern area ratio) (part B in FIG. 11). However, as described above, the minimum film thickness is determined by the paper type (high quality paper, coated paper, etc.), ink type (usually 10 to 20 types), dampening method (method of directly supplying dampening water to the plate surface, The method depends on the printing conditions, such as the method of mixing and supplying, and the method of using the former two together. Therefore, in order to realize the minimum film thickness suitable for the printing conditions and improve the stability of the color tone in the test printing (the test printing for color matching), the control parameter (here, In this case, it is necessary to set the ink key opening degree itself in consideration of printing conditions.

Therefore, in the present embodiment, the control parameter setting device 12 that calculates the set value of the control parameter is configured as described below, so that the control parameter can be set according to the printing conditions. Specifically, the control parameter setting device 12 includes at least a control parameter setting unit 20, a database 21, and an input unit (input unit).
22. In brief, the control parameter setting device 12 can be realized by an existing computer. In this case, the control parameter setting unit 20 includes a dedicated program stored in a hard disk or a ROM, a CPU for executing the program, and a RAM for appropriately storing and updating data necessary for the CPU to execute various processes. Is realized, and the database 21 is constructed in the hard disk. In addition, a keyboard, a mouse, and the like correspond to the input unit 22 in this case, and are connected online to the printing press control device 11 and the color tone management device 13 via an input / output interface.

First, the database 21 will be described. In the database 21, parameters for setting the ink key opening are stored and managed for each printing condition. More specifically, whether the film thickness (minimum film thickness) of the ink film formed under the ink key opening set by the control parameter setting device 12 is suitable for the printing conditions is determined by actually printing. The determination is made based on whether or not the density of the obtained printed matter matches the target density. That is,
Even if the printing conditions are the same, if the target density of the printed material changes, the optimum minimum film thickness of the ink film also changes, and the set value of the ink key opening also changes. Therefore, in the present embodiment, the correlation between the target density and the ink key opening for achieving the target density is represented by a function, and each coefficient of this function is stored in the database 21 for each printing condition. Here, as shown in the following equation (1), the correlation between the target density and the ink key opening degree is 1
It is expressed by the following function, and the coefficients A1 and A0 (A
1: A straight line inclination in the XY rectangular coordinate system, A0: Y intercept in the XY rectangular coordinate system) are stored in the database 21 for each printing condition.

Ink key opening set value = A1 × target density + A0 (1) Since the printing conditions are determined by a plurality of factors such as the paper type, the ink type, and the damping method as described above, the above-described coefficients are used. A1,
A0 is present by the number of combinations of these factors. The database 21 actually stores the values (effective values) of the coefficients A1 and A0 for the printing conditions for which the above correlation has been found by a test or the like.
For printing conditions for which the above correlation has not yet been determined, invalid values are stored as coefficients A1 and A0.

The control parameter setting section 20 sets the ink key opening to be input to the printing press control device 11 based on the correlation between the target density and the ink key opening stored in the database 21 (that is, each coefficient A1, A0). Settings,
Also, based on the test results, the coefficients A1, A corresponding to the printing conditions
0 is derived and newly stored in the database 21. That is, the control parameter setting unit 2
Numeral 0 functions as a search unit, a calculation unit, a correlation derivation unit, and a registration unit according to the ink reserve supply system of the present invention. Hereinafter, the function of the control parameter setting unit 20 will be described with reference to the flowcharts of FIGS. 2 and 3 while describing the procedure for setting the ink key opening degree using the control parameter setting device 12 according to the present embodiment.

First, as shown in FIG. 2, when a user inputs printing conditions to be printed from now on to the input unit 22 (step S10), the control parameter setting unit 20 uses the input printing conditions as a search condition in a database. 21 for each coefficient A1, A corresponding to the input printing condition.
0 is read from the database 21 (step S2).
0). When each of the read coefficients A1 and A0 is a valid value, the control parameter setting unit 20 prompts the user to input a target density via a display device or an audio device (not shown). 22 (step S30), the control parameter setting unit 20 calculates the expression (1)
Is used to determine the set value of the ink key opening (step S40). Then, the determined set value of the ink key opening is transmitted to the ink preliminary supply control unit 18 of the printing press control device 11 (step S50).

On the other hand, in step S20, the database 21
If each of the coefficients A1 and A0 read from is invalid, the control parameter setting unit 20 outputs data (coefficients A1 and A0) that match the current printing conditions via a display device or audio device (not shown). Is notified to the user, and the user is prompted to perform processing for newly calculating the coefficients A1 and A0 (step S100). These coefficients A1,
In the calculation process of A0, two different values for the ink key opening are selected and each test print is performed (preliminary test print for calculating each coefficient A1, A0, hereinafter, referred to as preliminary print).
Is performed, and the density values of the obtained printed matter are measured to derive a correlation between each selected value and the density value of the printed matter corresponding to each selected value. Specifically, FIG.
Are calculated in accordance with the flow shown in FIG.

First, when the user selects an arbitrary ink key opening X1 via the input unit 22, the control parameter setting unit 20 stores the selection value (first selection value) X1 of the ink key opening by the user in the memory. Memorize (Step S
110). Further, the control parameter setting unit 20 inputs the selection value X1 of the ink key opening degree by the user to the printing press control device 11 as a temporary setting value, and operates the printing press with the ink key opening degree set to the selection value X1. To start printing (preliminary printing). At this time, other control parameters other than the ink key opening are set to the same values as in the preliminary ink supply. In addition, the reference printing plate 19 used at this time is a printing plate having no pattern other than the color bar corresponding to the minimum film thickness necessary for printing, that is, a printing plate having a pattern area ratio of zero (substantially zero in consideration of the color bar). Used. Printing is performed only for a predetermined number of sheets (for example, about 25 sheets) of which the color tone becomes stable, and the operation is stopped when the predetermined number of sheets are printed (step S120).

Then, the user extracts a predetermined number (for example, the 25th sheet) of the printed matter 25 after the start of printing from the printed matter obtained by the above preliminary printing, and determines the density value D1 of the color bar 25a of the printed matter 25 with the color tone. When measured by the management device 13, the control parameter setting unit 20 stores the density value D1 measured by the color tone management device 13 in the memory in association with the selected value X1 of the ink key opening (step S).
130). Note that the color tone management device 13 is a device for managing the quality of the printed matter, but here functions as a density measuring unit for measuring the density value of the printed matter.

Next, when the user selects an arbitrary ink key opening X2 different from the first selection value X1 via the input unit 22, the control parameter setting unit 20 sets the ink key opening selection value ( The second selection value) X2 is stored in the memory (step S140). Further, the control parameter setting unit 20 inputs the selected value X2 to the printing press control device 11 as a temporary setting value, starts the prepress printing by operating the printing press with the ink key opening set to the selected value X2. I do. At this time, the control parameters other than the ink key opening are set to the same values as those at the time of the ink pre-supply, and printing is performed using the reference printing plate 19 having no pattern other than the color bar. Stop operation.
After the printing with the selection value X1, the ink cleaning is performed prior to the start of the current printing, and the ink roller group 6 is cleaned.
The ink is not wound at all. As a result, an ink film having a thickness corresponding to the newly selected ink key opening X2 is formed.
0).

Then, the user extracts a predetermined number (the same number as that of the selection value X1) of the printed matter 26 after the start of printing from the printed matter obtained by the preliminary printing described above, and determines the density of the color bar 26a of the printed matter. When the value D2 is measured by the color tone management device 13, the control parameter setting unit 20 stores the measured density value D2 in the memory in association with the selected value X2 of the ink key opening (step S160). Here, the density values D1 and D2 of the printed matter are measured each time the preliminary printing is performed for each of the selection values X1 and X2.
First, preliminary printing may be performed for each of the selection values X1 and X2, and thereafter, the density values D1 and D2 of each printed matter may be collectively measured.

The control parameter setting unit 20 stores
Based on the selection values X1 and X2 of the two different ink key opening degrees and the density values D1 and D2 of the corresponding color bars 25a and 26a of the printed materials 25 and 26, as shown in FIG. A straight line L approximating the correlation with the density value is derived. The control parameter setting unit 20 includes:
By associating the straight line L with the equation (1), the coefficients A0 and A1 serving as the feature amounts of the correlation are calculated (step S170), and the calculated coefficients A0 and A1 are made to correspond to the current printing conditions. It is stored in the database 21 (step S180).

When the coefficients A0 and A1 corresponding to the current printing condition are calculated by the above processing, the flow returns to the flow of FIG. 2 again, and the control parameter setting unit 20 provides the user with the target density via the display device or the like. (Step S3)
0). Then, the set values of the ink key opening are determined by applying the coefficients A0 and A1 calculated this time to equation (1) and substituting the target density input by the user into equation (1) (step S40). Then, the set ink key opening is set to the ink preliminary supply control unit 1 of the printing press controller 11.
8 (step S50).

When the set value of the ink key opening is input from the control parameter setting device 12, the ink preliminary supply control unit 18 first detaches the ink application roller 7 from the plate cylinder 8 via the roller control unit 17. Then, the ink key opening is set to the above-mentioned set value via the ink fountain control unit 15, and the ink source roller 3 is again rotated at a predetermined rotation speed via the roller control unit 17, and the ink retrieving roller 5 is moved to the predetermined value. By performing the number-of-calls operation, preliminary supply of ink from the ink fountain 2 to the ink roller group 6 is performed. Thus, an ink film having a film thickness corresponding to the set value of the ink key opening is formed on the ink roller group 6. Here, since the ink jetting roller 7 is detached from the plate cylinder 8 and the printing machine is idled, an ink film having a uniform thickness is formed on the ink roller group 6. When the operation is started in contact with the ink No. 8, the ink film thickness distribution changes from upstream to downstream so as to become thinner, and the minimum film thickness distribution required for printing according to the target density is realized.

As described above, according to the ink pre-supply system and the ink pre-supply method using the system according to the first embodiment of the present invention, the thickness of the ink film formed on the ink roller group 6 is determined by the printing conditions. Can be easily and accurately adjusted according to the printing conditions, greatly reducing the time and effort required for adjustment, shortening the preparation time until the start of actual printing, and improving productivity and reducing waste paper. There is an advantage that it becomes.

In particular, for printing conditions in which the coefficients A0 and A1, which are characteristic amounts of the correlation between the ink key opening degree and the target density value, are stored in the database 21, it is only necessary to input the printing condition and the target density. Because it is good, it can save the trouble of preliminary printing and can further improve productivity,
There is an advantage that waste paper can be further reduced by the amount that does not require preliminary printing.

When the linear approximation is used to derive the correlation between the ink key opening and the target density value as in the present embodiment, the calculation load of the control parameter setting device 12 can be reduced. At the same time, if the density value of the printed material corresponding to two different control parameters (here, the ink key opening degree) is measured, each coefficient A0,
Since A1 can be calculated, there is an advantage that occurrence of waste paper can be minimized by minimizing the number of times of preliminary printing.

In this embodiment, the control parameter setting device 12, the printing press control device 11, and the color tone management device 13
Are connected online, but these devices 11-
It is of course possible to install a part or all of the device 13 independently and exchange information between the devices 11 to 13 via a storage medium such as a floppy (registered trademark) disk, a CD-ROM, and an MO. is there. In addition, these devices 11 to
Some or all of the devices 13 may be realized as an integrated device, for example, the devices 11 to 13 may be realized as functional elements of one computer.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. In the present embodiment, the present invention is also applied to an ink pre-supply system of an offset printing press as in the first embodiment. Instead of a system completed in a factory, the functions of the ink spare supply system described in the first embodiment are provided by using an information communication network such as the Internet or a public line network, and a server and an externally arranged server and a user (printing machine). This is characterized in that it is realized in a distributed manner with the device on the side). That is, the ink reserve supply system according to the present embodiment is configured as a server-client system that can communicate via an information communication network.

FIG. 5 is a view showing a schematic configuration of an ink preliminary supply system according to the second embodiment. The same parts as those in the first embodiment are denoted by the same reference numerals in the drawings. As shown in FIG. 5, the ink preliminary supply system 30 of the present embodiment includes a printing press control device 11, a control parameter setting device 32, and a color tone management device 13 arranged on the printing press side (in a user factory) (these devices). 11 to 13 are all equivalent to the control device of the printing press of the present invention) and a server 31 arranged outside (for example, an information center). The control parameter setting device 32 is connected to the server 31 via the information communication network 33. Since the printing press control device 11 and the color tone management device 13 have the same configuration and the same function as those of the first embodiment, the description is omitted here.

The control parameter setting device 32 according to the present embodiment includes a control parameter setting unit 35, a database 21 and an input unit 22 as in the first embodiment, and a transmission / reception unit (transmission means) for communicating with the server 31. ,
(Receiving means) 36. The database 21 and the input unit 22 have the same functions as those in the first embodiment, but a new function is added to the control parameter setting unit 35. The function of the control parameter setting unit 35 will be described later. Note that, also in the present embodiment, the control parameter setting device 32 can be realized by an existing computer.

On the other hand, the server 31 includes at least the control unit 3
8, a database 39 and a transmission / reception unit 37. The transmission / reception unit 37 is an interface for communicating with the control parameter setting device 32 via the information communication network 33. The control unit 38 searches the database 39 based on at least the search condition received from the control parameter setting device 32. And a function of transmitting a search result to the control parameter setting device 32. The server 31 can also be realized by an existing computer. In this case, the CPU corresponds to the control unit 38. The database 39 is constructed in the hard disk.

Next, the database 39 will be described. In the database 39, reference values of the coefficients A1 and A0 of the equation (1), which are parameters for setting the ink key opening, are stored and managed for each printing condition. Have been. As described above, the printing conditions are determined by a plurality of factors such as the paper type, the ink type, the dampening method, and the like. It is necessary to spend a considerable amount of time to grasp the coefficients A1 and A0 for the conditions. Therefore,
In the present embodiment, the server 31 includes a database 39, and the database 39 stores each coefficient A for each printing condition.
By storing the reference values of A1 and A0, the user can save the data (coefficients A1 and A0 corresponding to specific printing conditions) that do not exist in the user database 21 by the user via the information communication network 33 through the server 31. By accessing the database 39 of the server 31.

The reason why the coefficients A1 and A0 stored in the database 39 are "reference values" is that the database 39 is scheduled to be used by a plurality of users, but the printing machine used by each user is There are individual differences, the same control parameters under the same printing conditions (ink key opening)
Is not always the same density value. Therefore, whether or not to use the reference values of the coefficients A1 and A0 stored in the database 39 as they are for setting the control parameters (here, the ink key opening degrees) is determined by the user himself / herself. Whether the preparatory printing is performed at least twice and the coefficients A1 and A0 are newly calculated as described in the embodiment, or the reference values of the coefficients A1 and A0 stored in the database 39 of the server 31 are used. Has the advantage that any one of them can be selected. In the latter case, the data on the server 31 (characteristic values of the coefficients A1 and A0) is multiplied by a coefficient specific to the printing machine of the user on the user side, so that the data on the server 31 is converted into the characteristics of the printing machine of the user. Can be customized to match the data.

In the control parameter setting unit 35 of the control parameter setting device 32, the ink key opening to be input to the printing press control device 11 is set based on the reference values of the coefficients A1 and A0 stored in the database 39 of the server 31. A new function has been added. Hereinafter, the procedure of setting the ink key opening using the control parameter setting device 32 according to the present embodiment will be described with reference to the flowcharts of FIGS. The function will be described. The same processing as the processing described in the first embodiment will be briefly described.

First, as shown in FIG. 6, when the user inputs printing conditions to be printed from now on to the input unit 22 (step S210), the control parameter setting unit 35
First, the database 21 in the control parameter setting device 32 is searched using the input printing conditions as search conditions, and the coefficients A1 and A0 corresponding to the input printing conditions are read from the database 21 (step S220). When each of the read coefficients A1 and A0 is a valid value, the control parameter setting unit 35 prompts the user to input a target density via a display device or an audio device (not shown). 22 (the above-described step S23).
0), the control parameter setting unit 35 determines the set value of the ink key opening using Expression (1) (Step S24).
0). Then, the determined set value of the ink key opening is transmitted to the ink preliminary supply control unit 18 of the printing press control device 11 (step S250).

On the other hand, in step S220, the database 2
If each of the coefficients A1 and A0 read out from No. 1 is an invalid value, the control parameter setting unit 35 outputs data (each coefficient A1, A0) that matches the current printing condition via a display device or audio device (not shown). ) Is not present in the database 21 and the user is caused to select one of the following processes (step S260).

Processing 1. Each of the two different ink key openings is selected and printed, the density values of the obtained printed matter are measured, and each coefficient is newly calculated from the correlation between each selected value and the density value of the printed matter corresponding to each selected value. A1 and A0 are calculated. Processing 2. Access to server 31 and server 31
The reference values of the coefficients A1 and A0 are read from the database 39.

If the processing 1 is selected in step S260, the coefficients A1 and A0 are calculated in step S270 according to the flow shown in FIG. 3 described in the first embodiment. On the other hand, when processing 1 is selected in step S260, processing is performed according to the flow shown in FIG. 7 (step S280). That is, the user sends a message from the control parameter setting device 32 to the server 31 in step S21.
When the information relating to the printing conditions input at 0 is transmitted via the information communication network 33 (step S310),
The control unit 38 of the server 31 searches the database 39 using the received information on the printing conditions as a search condition, and reads out reference values of the coefficients A1 and A0 corresponding to the input printing conditions from the database 39 (step S320).
Then, the control unit 38 of the server 31
Are transmitted to the control parameter setting device 32 via the information communication network 33 (step S330).

When the reference values of the coefficients A0 and A1 corresponding to the current printing condition are obtained by the above processing, the flow returns to the flow of FIG. Prompts the user to input a target density (step S230). Then, the reference values of the obtained coefficients A0 and A1 are applied to equation (1), and the set value of the ink key opening is determined by substituting the target density value input by the user into equation (1) (step S1). S240). Then, the set ink key opening is transmitted to the ink preliminary supply control unit 18 of the printing press control device 11 (step S250).

As described above, according to the ink pre-supply system and the ink pre-supply method using the system according to the second embodiment of the present invention, data that does not exist in the database 21 on the user side (for specific printing conditions). The corresponding coefficients A0, A1) can be complemented from the database 39 of the server 31. Therefore, preliminary printing is performed at least twice under specific printing conditions, and the respective coefficients A0, A1 are newly added.
There is an advantage in that the trouble of calculating is saved, and the productivity is further improved.

In the present embodiment, the data (coefficients A0 and A1) stored in the database 39 in consideration of the individual differences of the printing presses are treated as reference values. If small, database 3
9 can be directly used for setting control parameters. In this case, since necessary data can be received from the server 31 via the information communication network 33, the database
Since there is no need to have the above, the trouble of managing the database 21 can be omitted, and there is an advantage that productivity is further improved.
Also, a plurality of users share a common database 3
In the case of using No. 9, even if not all data is stored in the database 39 in advance, the data (coefficients A0 and A1) calculated by a plurality of users by themselves are stored in the database 3
9, the database 39 is updated.
There is an advantage that can be enhanced early.

Further, in the case where the database of the server is used without the user having the database as described above, the server may have a function of setting control parameters. That is, as in an ink spare supply system 30 ′ shown in FIG. 8, a control parameter setting unit (search unit and calculation unit) 41 is provided in a server 40 together with a transmission / reception unit (transmission unit and reception unit) 37 and a database 39. A communication terminal 45 including the input unit 22, the transmission / reception unit 36, and the control unit 46 is provided on the printing press side.

In this case, the control parameter setting section 41 of the server 40 has a function of searching the database 39 using the print condition received from the communication terminal 45 as a search condition, and the coefficients A0 and A1 that match the print condition by the formula ( Apply to 1),
Further, a function of determining a set value of a control parameter (ink key opening) by substituting the received target density value into equation (1) is provided. The control unit 46 of the communication terminal 45 transmits at least the information on the printing conditions and the information on the target density value input via the input unit 22 to the server 40 via the transmission / reception unit 36, and receives the information from the server 40. What is necessary is just to provide a function of inputting the ink key opening degree to the ink preliminary supply control unit 18 of the printing press control device 11.

By providing the server 40 with the above-described functions, the data stored in the database 39 can be shared between users, and the users can print the printing conditions and the target density on the terminal 45. There is also an advantage that the load on the user side is greatly reduced because only the input is required. In this case, the printing press control device 11,
The color tone management device 13 and the communication terminal 45 correspond to the control device of the printing press according to the server of the present invention. Also, in this case,
The communication terminal 45 may be provided integrally with the printing press control device 11.

As described above, two embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and can be variously modified and implemented without departing from the gist of the present invention. . For example, in each of the embodiments described above, the case where the present invention is applied to the offset printing press has been described. However, the present invention is not limited to only the offset printing press.

The control parameter (specific control parameter) is not limited to the ink key opening degree as described above, but is a control parameter related to the thickness of the ink film, such as the number of ink calls and the rotation amount of the ink source roller. I just need. In each of the above embodiments, two different control parameter values (in each of the above embodiments, the ink key opening degree)
Although the correlation between the set value of the specific control parameter and the density value of the printed matter is linearly approximated based on the print result (density value of the printed matter), the density values of the printed matter are collected for more control parameter values. It is also possible to derive the correlation using a higher-order function. However, as the number of data to be collected increases, the number of preliminary printings increases, and accompanying waste paper occurs. Therefore, from the viewpoint of reducing waste papers, the number of preliminary printings is reduced to a minimum (two times) using linear approximation. Preferably, it is suppressed.

Further, in each of the above-described embodiments, when performing preliminary printing for deriving the correlation between the set value of the specific control parameter and the density value of the printed matter, a process of selecting two different control parameters, The user performs a process of extracting a predetermined number of printed materials from the printed materials obtained by printing after the start of printing and setting the same in the color tone management device 13. Of course, a series of these processes can be automated. .

Further, in each of the embodiments described above, the case where the ink film having the minimum film thickness necessary for printing is formed on the ink roller group is described. According to the present invention, the setting of the pattern area ratio of the reference printing plate is performed. Thus, the ink film can be adjusted to an arbitrary film thickness. For example, the control parameters (ink key opening and the like) are determined by the above procedure using a reference printing plate having a pattern area ratio of 50%, and preliminary supply of ink is performed using the determined control parameters. Is formed with an ink film that satisfies the target density when the pattern area ratio is 50%.

[0068]

As described in detail above, according to the ink pre-supply method of the present invention, the thickness of the ink film formed on the ink roller group can be easily adjusted to match the target density according to the printing conditions. Therefore, there is an effect that the preparation time until the start of the actual printing can be shortened, the productivity can be improved, and the waste paper can be reduced.

In particular, among the control parameters of the printing press, a set value of a specific control parameter for determining the thickness of the ink film formed on the ink roller group and a reference printing plate having a predetermined pattern area ratio based on the set value. By storing in a database the correlation with the density value of the printed matter when printing is performed for each printing condition, for the printing condition for which the correlation has been obtained once, the target density value is simply determined. Since the set value of the specific control parameter according to the printing condition can be obtained, there is an effect that the productivity can be further improved and the waste paper can be further reduced.

Further, by deriving the correlation using the linear approximation, it is possible to reduce the calculation load required for the derivation, and to measure the density value of the printed matter corresponding to two different specific control parameters. If so, the above correlation can be derived, so that it is possible to minimize the number of test prints and further suppress the occurrence of waste paper.

Further, according to the ink pre-supply system of the present invention, the printed matter when printing is performed using the reference printing plate having a predetermined pattern area ratio based on the set values of the specific control parameters and the set values. The database has a database that stores the correlation with the density values for each printing condition, so the user only needs to enter the printing conditions and the target density, and the thickness of the ink film formed on the ink roller group It can be adjusted easily and accurately in response to this, greatly reducing the labor of adjustment and shortening the preparation time until the start of actual printing, thereby improving productivity and reducing waste paper. effective.

In particular, the correlation between the newly derived set value of the specific control parameter and the density value of the printed matter can be registered in the database in correspondence with the printing conditions.
With respect to the printing conditions for which the above correlation has been obtained once, it is possible to obtain the set values of the specific control parameters according to the printing conditions only by determining the target density value.

Further, by deriving the correlation using linear approximation, it is possible to reduce the calculation load required for derivation, and to measure the density value of the printed matter corresponding to two different specific control parameters. If so, the above correlation can be derived, so that it is possible to minimize the number of test prints and further suppress the occurrence of waste paper.

Furthermore, the ink reserve supply system of the present invention is configured as a server-client system including a server and a client terminal connected via an information communication network, and at least the database is provided in the server, so that the data is stored in the database. There is an effect that data on the correlation for each printing condition can be shared by a plurality of users.

According to the control device of the printing press of the present invention, the information necessary for the preliminary supply of the ink (the information relating to the correlation) is received from the server via the information communication network, whereby the specific control is performed in advance. There is no need to grasp the correlation between the parameter setting value and the density value of the printed material corresponding to the setting value, and the productivity is further improved.

Further, according to the server of the present invention, it is possible to share data relating to the correlation for each printing condition stored in the database among users,
Since the control device only needs to input the printing conditions and the target density, the load on the control device can be greatly reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an ink preliminary supply system according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a control parameter setting procedure according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating a control parameter setting procedure according to the first embodiment of the present invention.

FIG. 4 is a diagram for explaining a method for deriving a correlation between a set value of a control parameter and a target density value according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating a schematic configuration of an ink preliminary supply system according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing a control parameter setting procedure according to a second embodiment of the present invention.

FIG. 7 is a flowchart showing a control parameter setting procedure according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a schematic configuration of a modified example of the ink preliminary supply system according to the second embodiment of the present invention.

FIG. 9 is a diagram showing a schematic configuration of a conventional offset printing press.

FIG. 10 is a diagram illustrating an ink film thickness distribution formed on an ink roller group during a steady operation in the offset printing press of FIG. 9;

11 is a diagram showing a relationship between a pattern area ratio and an ink film thickness in the offset printing press of FIG. 9;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 ink 2 ink fountain 3 ink source roller 4 ink key 5 ink feeding roller 6 ink roller group 7 ink application roller 8 plate cylinder 10, 30, 30 'ink pre-supply system 11 printing machine control device 12, 32 control parameter setting device 13 color tone Management device 15 Ink fountain control unit 16 Printing press drive unit 17 Roller control unit 18 Ink pre-supply control unit 19 Printing plate 20, 35 Control parameter setting unit 21 Database 22 Input unit 25, 26 Printed matter 25a, 26a Color bar 31, 40 Server Reference Signs List 33 Information communication network 36 Transmission / reception unit of control parameter setting device 37 Transmission / reception unit of server 39 Database of server 41 Control parameter setting unit of server 45 Communication terminal

Continued on the front page (72) Inventor, Soichi Takemoto 5007, Itozaki-cho, Mihara-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Paper and Printing Machinery Division F-term (reference) 2C250 DB06 DC01 DC02 DC04 DC05 EA24 EB32 EB35

Claims (9)

[Claims] 1. A method for performing preliminary supply of ink to a group of ink rollers of a printing press in order to form an ink film on the group of ink rollers prior to the start of printing. Selecting at least two different values for a specific control parameter for determining the thickness of the film, and using the reference printing plate having a predetermined pattern area ratio under specific printing conditions, and controlling the selected values to the specific control. Perform a trial print as a temporary setting value of the parameter, measure the density value of the printed matter obtained by the trial print for each of the selected values, and measure the density values of the printed matter corresponding to the selected values and the selected values. Calculating the value of the specific control parameter for realizing the target density value based on the calculated value, and using the calculated value as the set value of the specific control parameter under the specific printing condition. And performing feed, ink reserve supply method. 2. Deriving a correlation between a set value of the specific control parameter and a density value of a printed material under the specific printing conditions based on each of the selected values and a density value of a printed material corresponding to each of the selected values; The derived correlation is stored in a database corresponding to the specific printing condition, and at the start of printing, the database is searched using the current printing condition as a search condition, and the correlation corresponding to the current printing condition is performed. Is stored in the database, the set value of the specific control parameter is calculated based on the target density value and the correlation corresponding to the current printing condition stored in the database, and preliminary supply of ink is performed. The method for preliminarily supplying ink according to claim 1, wherein: 3. The ink reserve according to claim 2, wherein the correlation is derived by approximating the relationship between each selected value and the density value of a printed material corresponding to each selected value with a straight line. Supply method. 4. An input means for inputting information necessary for operation of a printing press, and a set value of a specific control parameter for determining a film thickness of an ink film formed on an ink roller group among control parameters of the printing press. And a database storing, for each printing condition, a correlation between the density value of a printed material when printing is performed using a reference printing plate having a predetermined pattern area ratio under the above set values, and via the input means. A search unit that searches the database using the input print condition as a search condition when the print condition is input, and obtains the correlation corresponding to the input print condition; and a search of the database by the search unit. Calculating a set value of the specific control parameter corresponding to the input target density value based on the correlation acquired by the above and the target density value input via the input means. And control means for controlling the printing press to set the specific control parameter to the set value calculated by the calculation means and to pre-supply ink to the ink roller group. Ink supply system. 5. A density measuring means for measuring a density value of a printed matter, and at least two different values for the specific control parameter are selected under specific printing conditions, and each selected value is set as a temporary setting value. When the test printing using the reference printing plate is performed, the identification under the specific printing conditions is performed based on the selected values and the density values of the printed matter corresponding to the selected values measured by the density measuring unit. A correlation deriving means for deriving a correlation between the set value of the control parameter and the density value of the printed matter; and registering the correlation derived by the correlation deriving means in the database in correspondence with the specific printing condition. The ink preliminary supply system according to claim 4, further comprising a registration unit. 6. The correlation deriving means is configured to derive the correlation by approximating, by a straight line, a relationship between each of the selected values and a density value of a printed material corresponding to each of the selected values. The ink preliminary supply system according to claim 5, characterized in that: 7. The server according to claim 4, which is configured as a server-client system comprising a server and a client terminal connected via an information communication network, and wherein at least said database is provided in said server. An ink preliminary supply system according to any one of the preceding claims. 8. A set value of a specific control parameter for determining a film thickness of an ink film formed on an ink roller group among control parameters of a printing press, and a reference of a predetermined pattern area ratio based on the set value. A printing press control device that can be connected via an information communication network to a server having a database that stores a correlation with a density value of a printed material when printing is performed using a printing plate for each printing condition, Input means for inputting information necessary for operation of the printing press; and when printing conditions are input via the input means, transmitting information on the input printing conditions to the server via the information communication network. Transmitting means for performing the search, the server side searching the database,
Receiving means for receiving the information on the correlation corresponding to the printing condition from the server via the information communication network; the correlation information received by the receiving means; and a target inputted via the input means Calculating means for calculating a set value of the specific control parameter corresponding to the input target density value based on the density value; and setting the specific control parameter to the set value calculated by the calculating means, the ink roller Control means for controlling said printing press to pre-supply ink to the group. 9. A server which can be connected to a control device of a printing press via an information communication network, wherein the server has a specific parameter correlated with a thickness of an ink film formed on an ink roller group among control parameters of the printing press. A database storing, for each printing condition, a correlation between a set value of the control parameter and a density value of a printed material when printing is performed using a reference plate having a predetermined pattern area ratio based on the set value; Receiving means for receiving information about the condition and information about the target density from the control device via the information communication network, and using the print condition received by the receiving means as a search condition, Searching means for searching from a database, based on the correlation searched from the database by the searching means, and a target concentration value received by the receiving means, Calculating means for calculating the set value of the specific control parameter corresponding to the target density value; and the ink roller group which performs the set value of the specific control parameter calculated by the calculating means before starting printing of the printing press. Transmitting means for transmitting to the control device via the information communication network as a set value for the preliminary supply of ink to the server.