JP2008254453A - Ink supply amount adjusting method and apparatus of multicolor printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily perform color matching work at the time of real printing and setting/adjusting work of an ink supply amount in a short time. <P>SOLUTION: As the setting/adjusting of an ink supply amount, the adjusting of a correction amount (uniform value) of an opening amount of an ink fountain key of each color and a correction value (coefficient of an ink feeding rate) of a feeding rate of an ink fountain roller is performed. A memory 27 is made to memorize the correction amount of the opening amount of the ink fountain key of each color and a memory 30 is made to memorize the correction value of the feeding rate of the ink fountain roller of each color. The adjusting of the correction amount of the opening amount of the ink fountain key of each color and the correction value of the feeding rate of the ink fountain roller of each color is performed so that the measured consistency value and the criteria consistency value of each color of a printing sample by a testing machine plate are in agreement with together. At the time of printing start, the criteria opening amount of each ink fountain key of each color is calculated from "a conversion curve of a pattern area ratio-an ink fountain key opening amount" for each color and is corrected by the correction amount after the adjusting. Moreover, the criteria ink feeding rate established as a common to each color is read from the memory 26, and is corrected by the correction value of the feeding rate of the ink fountain roller of each color in the memory 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply amount adjustment method and apparatus for a multi-color printing machine that adjusts the ink supply amount to a printing plate by adjusting the setting of an ink fountain key opening amount and an ink fountain roller feed amount (rotation amount). It is.

  FIG. 17 shows a main part of an inker (ink supply device) in a printing unit for each color in a rotary printing press. In the figure, 1 is an ink fountain, 2 is ink stored in the ink fountain 1, 3 is an ink fountain roller, 4 (4-1 to 4-n) are provided in parallel in the axial direction of the ink fountain roller 3. Ink fountain keys, 5 is an ink transfer roller, 6 is an ink roller group, 7 is a printing plate, and 8 is a plate cylinder.

  FIG. 18 is a diagram showing a four-color rotary printing press. In the figure, reference numerals 9-1 to 9-4 denote printing units of respective colors, and the ink supply devices described above are provided in the printing units 9-1 to 9-4.

  In this printing machine, the amount of ink supplied from the ink fountain 1 to the ink fountain roller 3 is adjusted by adjusting the opening amount of the ink fountain keys 4-1 to 4-n, and the feed amount (rotation amount) of the ink fountain roller 3 is adjusted. ), The amount of ink supplied from the ink fountain roller 3 to the printing plate 7 via the ink roller group 6 is adjusted, and the ink supplied to the printing plate 7 is printed on the printing paper.

  The opening amount of the ink fountain keys 4-1 to 4-n is set in advance according to the pattern area ratio of each area of the printing plate 7 corresponding to the ink fountain keys 4-1 to 4-n. It is set according to the “conversion curve”. Further, the feed amount of the ink fountain roller 3 is set according to a predetermined reference ink feed amount. The setting of the ink fountain keys 4-1 to 4-n and the setting of the ink fountain roller 3 feed amount (ink feed amount) are performed for each color printing unit 9 (9-1 to 9-4). That is, the “pattern area ratio−ink fountain key opening amount conversion curve” and the reference ink feed amount are determined for each color (for example, see Patent Documents 1 and 2).

JP-A-8-11292 JP-A-5-104699

  However, in the past, the "print area ratio-ink fountain key opening amount conversion curve" and the standard ink feed amount are uniquely set by the printer manufacturer. .

  Therefore, the operator of each printing company sets the opening amount of the ink fountain keys 4-1 to 4-n and the feed amount of the ink fountain roller 3 for each printing unit 9 for each color using the standard characteristics, and then presses the printing plate. 7 by looking at the color of the printed matter printed by 7 and finely adjusting the opening amount of the ink fountain keys 4-1 to 4-n individually or by finely adjusting the feed amount of the ink fountain roller 3. It corresponds to the difference by each. This fine adjustment of the ink supply amount requires very advanced technology and cannot be easily performed by anyone. Further, it takes a lot of time for fine adjustment, and the printing work is delayed.

  Conventionally, the “pattern area ratio−ink fountain key opening amount conversion curve” and the reference ink feed amount have to be stored for each color, which requires a huge storage capacity.

  The present invention has been made in order to solve such problems, and the object of the present invention is that it is possible to easily and quickly perform color matching work and ink supply amount setting adjustment during actual printing, Another object of the present invention is to provide an ink supply amount adjustment method and apparatus for a multicolor printing machine that does not require a huge storage capacity.

  In order to achieve such an object, the present invention relates to the relationship between the pattern area ratio preset for each color and the ink fountain key opening amount according to the pattern area of each area of the printing plate corresponding to each ink fountain key of each color. In accordance with the first step of obtaining the reference opening amount of each ink fountain key of each color, and the correction amount of the opening amount of the ink fountain key set in advance for each color with the obtained standard opening amount of each ink fountain key of each color as a uniform value. The second step for obtaining the setting value of the opening amount of each ink fountain key for each color by adding and subtracting and correcting the reference feed amount of the ink fountain roller preset for each color in advance for each color A third step of obtaining a setting value of the feed amount of the ink fountain roller of each color by correcting with the correction value of the feed amount of the fountain roller; The combination of the correction amount of the ink fountain key opening amount of each color in the second step and the correction value of the feed amount of the ink fountain roller of each color in the third step is a density value within the range of all the pattern areas of each color. Is a combination capable of adjusting the translation of

  According to the present invention, each color according to the relationship between the pattern area ratio and the ink fountain key opening amount set in advance as common to each color (the only “picture area ratio-ink fountain key opening amount conversion curve set by the printing press manufacturer)” The standard opening amount of each ink fountain key is calculated, and the standard opening amount of each ink fountain key for each color is uniform and corrected by adding or subtracting the correction amount (increase / decrease value) of the ink fountain key opening amount preset for each color Then, the corrected reference opening amount is set as the opening amount of each ink fountain key of each color. In addition, the ink fountain roller reference feed amount set in advance for each color (the only reference feed amount set by the printer manufacturer) is the preset ink fountain roller feed amount for each color. Correction is performed using the correction value, and the corrected reference feed amount is set as the feed amount of the ink fountain roller of each color. In this setting, the combination of the correction amount of the ink fountain key opening amount of each color in the second step and the correction value of the feed amount of the ink fountain roller of each color in the third step makes the density value parallel in the range of all the pattern areas of each color. The combination can be adjusted.

  The present invention also provides a first step for presetting the correction amount of the ink fountain key opening amount for each color as a uniform value, and the correction of the ink fountain key opening amount for each color in which the origin position of the ink fountain key opening amount of each color is set. The second step of correcting by adding / subtracting the amount, and the relationship between the pattern area ratio preset for each color and the ink fountain key opening amount according to the pattern area of each area of the printing plate corresponding to each ink fountain key of each color In accordance with the third step of obtaining the setting value of the opening amount of each ink fountain key for each color, and the ink fountain roller feed amount preset for each color, the reference feed amount of the ink fountain roller preset as common to each color And a fourth step for obtaining the set value of the feed amount of the ink fountain roller of each color by correcting with the correction value of The combination of the correction amount of the ink fountain key opening amount of each color in the second step and the correction value of the feed amount of the ink fountain roller of each color in the fourth step adjusts the parallel translation of the density value in the range of all the pattern areas of each color. It is a possible combination.

  According to this invention, the origin position of the opening amount of each ink fountain key of each color is corrected by adding or subtracting the correction amount of the opening amount of the ink fountain key for each color, and then set in advance as common to each color. The setting value of each ink fountain key opening amount for each color is calculated according to the relationship between the pattern area ratio and the ink fountain key opening amount (the only “pattern area ratio-ink fountain key opening amount conversion curve” set by the printer manufacturer). . In addition, the ink fountain roller reference feed amount set in advance for each color (the only reference feed amount set by the printer manufacturer) is the preset ink fountain roller feed amount for each color. Correction is performed using the correction value, and the corrected reference feed amount is set as the feed amount of the ink fountain roller of each color. In this setting, the combination of the correction amount of the ink fountain key opening amount of each color in the second step and the correction value of the feed amount of the ink fountain roller of each color in the fourth step makes the density value parallel in the range of all the pattern areas of each color. The combination can be adjusted.

  Further, according to the present invention, since the correction value of the ink fountain key opening amount and the ink fountain roller feed amount correction value for each color can be rewritten, the ink fountain key opening amount correction amount (increase / decrease value) for each color can be changed. By adjusting the correction value of the ink fountain roller feed amount before the start of printing, the ink supply amount setting can be easily adjusted in a short period of time depending on the standard density of each printing company or the environment. It becomes possible.

  According to the present invention, according to the pattern area of each area of the printing plate corresponding to each ink fountain key of each color, each ink fountain key of each color according to the relationship between the pattern area ratio preset as common to each color and the opening amount of the ink fountain key. Each ink fountain key for each color is obtained by calculating the reference opening amount and correcting the ink fountain key opening amount preset for each color by adding and subtracting the reference opening amount of each ink fountain key for each color as a uniform value. By setting the ink fountain roller reference feed amount set in advance as common to each color and correcting the ink fountain roller feed amount preset for each color for each color, By calculating the setting value of the ink fountain roller feed amount, the correction amount of the ink fountain key opening amount for each color before printing starts In addition, by adjusting the correction value of the feed amount of the ink fountain roller for each color so that the standard density value unique to the printing company can be obtained regardless of the pattern area ratio, color matching work during actual printing can be done easily and quickly. Can be performed. In addition, the relationship between the pattern area ratio and the ink fountain key opening amount only needs to be set as the standard for each color, and the standard fountain roller feed rate is the only common for each color. Since it only has to be set, a huge storage capacity is not required, and the storage capacity can be greatly reduced.

  In addition, according to the present invention, the ink fountain key opening amount correction amount is set in advance as a uniform value for each color, and the ink fountain key opening amount for each color is set as a uniform value. Each color is corrected by adding or subtracting the correction amount, and according to the relationship between the pattern area ratio set in advance for each color and the ink fountain key opening amount according to the pattern area of each area of the printing plate corresponding to each ink fountain key of each color. The ink fountain key opening amount setting value is obtained, and the ink fountain roller reference feed amount preset for each color is corrected with the ink fountain roller feed amount correction value preset for each color. To determine the feed value of the ink fountain roller for each color, so that the ink fountain key for each color can be opened before printing. By adjusting the origin position of the quantity so that the standard density value of each color unique to the printing company can be obtained regardless of the pattern area ratio, it is possible to perform color matching work during actual printing easily and in a short time Become. In addition, the relationship between the pattern area ratio and the ink fountain key opening amount only needs to be set as the standard for each color, and the standard fountain roller feed rate is the only common for each color. Since it only has to be set, a huge storage capacity is not required, and the storage capacity can be greatly reduced.

  In addition, according to the present invention, the correction amount of the ink fountain key opening amount and the ink feed amount correction value for each color can be rewritten, so that the ink fountain key opening amount correction amount (increase / decrease value) and the ink feed amount for each color can be rewritten. By adjusting the correction value before the start of printing, it is possible to adjust the ink supply amount setting according to the difference in the standard density of each printing company and the environment easily and in a short time, and can easily cope with it.

Hereinafter, the present invention will be described in detail based on embodiments.
[Reference Example 1]
FIG. 1 is a block diagram showing a reference example (reference example 1) before entering into the description of Embodiment 1 of an ink supply amount adjusting device for a multicolor printing machine according to the present invention. In the figure, 10 is a CPU, 11 is a ROM, 12 is a RAM, 13 is a switch group, 14 is a display, 15 is a flexible disk or magnetic card drive (drive device), 16 is a printer, 17 is a densitometer, and 18 Plate picture area ratio measuring device, 19, 20 A / D converter, 21-23 input / output interface (I / F, I / O), 24-27 memory, 28 ink fountain key drive device, 29 ink A point roller driving device. The CPU 10 obtains various input information given through the interfaces 21 to 23 and performs various processing operations while accessing the RAM 12 according to a program stored in the ROM 11.

  The memory 24 stores a reference density value for each color unique to the printing company as needed (a standard density value for each color is stored when the printer manufacturer is shipped). The memory 25 stores a “picture area ratio-ink fountain key opening amount conversion curve” which is a common reference for each color (a unique standard characteristic common to each color is stored at the time of shipment from the printer manufacturer). The memory 26 stores an ink feed amount for each color (a reference ink feed amount for each color is stored as a standard value when the printer manufacturer is shipped). In the memory 27, the correction amount (increase / decrease value) of the ink fountain key opening amount for each color is set as a uniform value. That is, for each color, a correction amount common to the ink fountain keys 4-1 to 4-n (FIG. 17) is set as the correction amount of the ink fountain key opening amount. The correction amount of the ink fountain key opening amount is set to 0 when the printer manufacturer is shipped.

  The ink fountain key drive device 28 is provided for each color corresponding to the ink fountain keys 4-1 to 4-n of the respective colors. That is, the ink fountain key drive device 28 of each color is composed of n ink fountain key drive devices 28-1 to 28-n, and the ink fountain key drive devices 4-1 to 28-n use the ink fountain key 4-1 to 4-n. The opening amount with respect to the acupoint roller 3 is adjusted to each piece. The ink fountain key drive devices 28-1 to 28-n have the same configuration, and include an input / output interface 28A, a D / A converter 28B, a fountain key motor driver 28C, a fountain key motor 28D, and a fountain key motor 28D. Are provided with a potentiometer 28E and an A / D converter 28F.

  An ink fountain roller driving device 29 is provided for each fountain roller 3 of each color. That is, in the four-color rotary printing press, the ink fountain roller driving device 29 is composed of four ink fountain roller driving devices 29-1 to 29-4, and by these ink fountain roller driving devices 29-1 to 29-4, The feed amount of the ink fountain roller 3 for each color is adjusted to each individual. The ink fountain roller driving devices 29-1 to 29-4 have the same configuration, and include an input / output interface 29A, a D / A converter 29B, a fountain roller driving motor driver 29C, a fountain roller driving motor 29D, A rotary encoder 29E attached to the pressure roller driving motor 29D, an F / V converter 29F, and an A / D converter 29G are provided.

[Adjustment of ink fountain key opening amount and ink feed amount during adjustment before actual printing]
FIG. 2 is a flowchart for explaining a characteristic operation before starting printing in the ink supply amount adjusting apparatus. In this ink supply amount adjusting device, before the start of printing, the ink fountain key opening amount correction amount for each color in the memory 27 and the ink feed amount for each color in the memory 26 are adjusted. For this adjustment, a test printing plate 7A as shown in FIG. 4 is used. The test printing plate 7A is provided with a color patch portion 7A1 and an ink supply amount adjusting pattern portion 7A2.

  The color patch portion 7A1 is a well-known pattern portion used for measuring print quality, and a plurality of color patch portions 7A1 provided in the respective areas corresponding to the ink fountain keys 4-1 to 4-n at predetermined intervals in the horizontal direction in the figure. It is composed of patches (not shown). The pattern portion 7A2 for adjusting the ink supply amount is a right triangle, and the pattern area ratio in each area corresponding to the ink fountain keys 4-1 to 4-n changes gently along the direction in which the ink fountain keys are arranged.

  In adjusting the ink fountain key opening correction amount and the ink feed amount using the ink supply amount adjusting device, the operator measures the pattern area ratio of the test printing plate 7A with the printing plate pattern area ratio measuring device 18, This is given to the CPU 10 (step 101 shown in FIG. 2). That is, the pattern area ratio of each area corresponding to the ink fountain keys 4-1 to 4-n of the test printing plate 7A is measured, and this pattern area ratio is sent to the CPU 10 via the A / D converter 20 and the I / F · 22. Give to.

  Then, the CPU 10 determines the “pattern area ratio-ink fountain key opening amount common to each color stored in advance in the memory 25 according to the pattern area ratio of each area of the test printing plate 7A corresponding to the ink fountain keys 4-1 to 4-n. According to the “conversion curve (standard characteristics)”, the reference opening amount of the ink fountain keys 4-1 to 4-n for each color is obtained (step 102). Then, the ink feed amount of each color is read from the memory 26 (step 103), and the read ink feed amount of each color is set for the ink fountain roller 3 of each color via the ink fountain roller driving device 29, and step 102 is performed. The reference opening amounts of the ink fountain keys 4-1 to 4-n for the respective colors obtained in the above are set via the ink fountain key driving device 28 (step 104).

  Next, the operator performs printing in a state where the test printing plate 7A is set on the plate cylinder 8 of each color, and collects a print sample (step 105). Then, the density value of each color of the collected print sample is measured using the densitometer 17 (step 106), and given to the CPU 10 via the A / D converter 19 and the I / F · 21. Based on the data from the densitometer 17, the CPU 10 determines the density value (measured density value) of each area corresponding to the ink fountain keys 4-1 to 4-n of each color of the print sample and the reference of each color stored in the memory 24 in advance. It is checked whether or not the density value (reference density value unique to the printing company) matches (step 107).

  Here, if the measured density value does not match the reference density value, that is, if the difference between the measured density value and the reference density value is zero or not within a predetermined range, the density value needs to be adjusted. Judge. Here, for the sake of explanation, it is assumed that the measured density value and the reference density value of all areas of each color do not match.

  If the density value needs to be adjusted, the operator adjusts the correction amount of the ink fountain key opening amount of each color stored in the memory 27 and the ink feed amount of each color stored in the memory 26 (step). 108). That is, the value is increased / decreased while observing the correction amount and ink feed amount of the ink fountain key for each color currently displayed on the display 14. The adjusted ink fountain key opening correction amount and ink feed amount are overwritten in the memories 27 and 26, respectively.

  The CPU 10 reads the adjustment amount of the ink fountain key of each color after adjustment from the memory 27 (step 109), and the ink fountain key 4-1 for each color obtained from the read amount of the ink fountain key of each color obtained in step 102. By adding to the 4-n reference opening amount, that is, if the correction amount is positive, it is added, and if it is negative, the opening amount of the ink fountain keys 4-1 to 4-n is corrected ( Step 110).

  Then, the CPU 10 reads the adjusted ink feed amount of each color from the memory 26 (step 111), the read ink feed amount of each color, and the opening amount of the ink fountain keys 4-1 to 4-n corrected in step 110. Is set via the ink fountain roller driving device 29 and the ink fountain key driving device 28 (step 112).

  Here, in each color, when the measured density value in step 107 is a constant value A regardless of the pattern area ratio as shown by the characteristic I shown in FIG. 5A, the ink feed amount is adjusted in step 112. Doing so changes its properties. For example, when the ink feed amount is increased, the density value increases as shown in the characteristic II, but the increase is slow in the portion where the pattern area ratio is low, and the density value gradually increases as the pattern area ratio increases. When the pattern area ratio is reached, the density shifts in parallel.

  Further, in each color, when the measured density value in step 107 is a constant value A regardless of the pattern area ratio as in the characteristic I shown in FIG. 5B, in step 112, each ink fountain key 4-1 The characteristic changes by adjusting the opening amount of 4-n. For example, when the opening amount of each ink fountain key 4-1 to 4-n is increased uniformly, the density value increases as shown in the characteristic III, but the increase is large in the portion where the pattern area ratio is low, and the pattern area ratio is increased. As the density increases, the density value gradually decreases, and when a certain pattern area ratio is reached, the density moves in parallel.

  In step 112, since both the ink feed amount and the ink fountain key opening amount are adjusted, the characteristic IV is a combination of the characteristics II and III (see FIG. 5C), and each color stored in the memory 25 is displayed. The printing density of each color can be translated and adjusted to a desired density value (reference density value) B without changing the common “pattern area ratio-ink fountain key opening amount conversion curve”.

  Conventionally, the “pattern area ratio-ink fountain key opening amount conversion curve” of each color (for example, eye, red, yellow, and sumi) is as shown in FIG. Accordingly, the opening amount of the ink fountain key for each color is obtained from the eye or red conversion curve, and the density when printed is as shown in FIG. As can be seen from this figure, the density of the smear has a density distribution that is almost opposite to that when the feed amount of the ink fountain roller is increased, and the density of the key is a density distribution that is almost the opposite of that when the ink fountain key opening amount is uniformly increased. become.

  These density distributions can be made almost uniform by uniformly increasing or decreasing the feed amount of the ink fountain roller or the opening amount of the ink fountain key. As a result, the density distribution of each color can be made uniform, but the density is different from the reference density. However, as described above, by increasing or decreasing the feed amount of the ink fountain roller and the opening amount of the ink fountain key uniformly, the density of each pattern area ratio can be changed almost uniformly. Can be adjusted to the reference density of each color in each printing station.

  Based on the above, by using the “pattern area ratio-ink fountain key opening amount conversion curve” common to each color, the feed density of the ink fountain roller and the ink fountain key opening amount are uniformly increased or decreased, so that the reference density and color of each color in each printing station can be The ink supply amount can be determined according to the printing conditions. In subsequent printing, the ink supply amount of the ink fountain roller and the increase / decrease value of the ink fountain key opening / closing value can be used to easily and appropriately supply the ink. Can be requested.

  After adjusting the ink feed amount and the ink fountain key opening amount in step 112, the operator performs printing again with the test printing plate 7A set on the plate cylinder 8, and collects a printing sample (step 113). The density value of each color is measured (step 114). The CPU 10 checks whether the measured density value and the reference density value of each area corresponding to the ink fountain keys 4-1 to 4-n of each color of the collected print sample are the same as in the previous step 107. (Step 115).

  Steps 108 to 115 are repeated until the measured density value and the reference density value of all areas of each color match. If the measured density value and the reference density value of all areas of each color match, the CPU 10 ends the adjustment process of the ink fountain key opening amount and ink feed amount before the start of printing.

[Ink supply amount setting method at the start of actual printing]
FIG. 3 is a flowchart for explaining a characteristic operation at the start of printing in the ink supply amount adjusting apparatus. In this ink supply amount adjusting device, when printing is started with the printing plate 7 for each color mounted, the operator measures the pattern area ratio of the printing plate 7 for each color with the printing plate area ratio measuring device 18. To the CPU 10 (step 201). That is, the pattern area ratio of each area corresponding to the ink fountain keys 4-1 to 4-n of the printing plate 7 for each color is measured, and this pattern area ratio is measured via the A / D converter 20 and the I / F · 22. To the CPU 10.

  Then, the CPU 10 uses the “pattern area ratio-ink fountain key common to each color stored in advance in the memory 25 according to the pattern area ratio of each area of the printing plate 7 for each color corresponding to the ink fountain keys 4-1 to 4-n. According to the “opening amount conversion curve”, the reference opening amounts of the ink fountain keys 4-1 to 4-n for the respective colors are obtained (step 202). Then, the correction amount of the ink fountain key of each color is read from the memory 27 (step 203), and the correction amount of the ink fountain key of each color thus read is determined by the ink fountain keys 4-1 to 4-n of each color obtained in step 202. By adding to the reference opening amount, that is, when the correction amount is positive, addition is performed, and when the correction amount is negative, subtraction is performed to obtain a setting value of the opening amount of the ink fountain keys 4-1 to 4-n for each color (step 204). ).

  Then, the CPU 10 reads the ink feed amount of each color from the memory 26 (step 205), and determines the ink feed amount of each color read and the opening amount of the ink fountain keys 4-1 to 4-n of each color obtained in step 204. Setting is made via the roller driving device 29 and the ink fountain key driving device 28 (step 206), and printing is started (step 207).

  In this case, the ink feed amount of each color in the memory 26 and the correction amount of the ink fountain key opening amount of each color in the memory 27 are determined by the printing company regardless of the pattern area ratio by repeating the previous steps 108 to 115 before starting printing. Since it is adjusted so as to obtain a unique reference density value for each color, a suitable ink supply amount can be obtained from the beginning.

  In other words, according to the standard density value and printing environment conditions specific to the printing company used so far, the operator sets the printing amount of the ink fountain keys 4-1 to 4-n and the ink feed amount for each color, and then the operator presses the printing plate. While repeating the printing test of the printed matter according to No. 7, the adjustment of the opening amount of each color ink fountain key 4-1 to 4-n and the ink feed amount is adjusted without regularity so that the appropriate ink supply amount is obtained. It was. In this reference example 1, such adjustment of the ink supply amount after mounting the printing plate 7 is unnecessary, and an appropriate ink supply amount can be obtained immediately after the printing plate 7 is mounted. it can.

  Further, in the first reference example, since the correction amount of the ink fountain key for each color is a uniform value, the correction amount before the start of printing and the ink feed amount are compared with the method of setting different correction amounts for each ink fountain key. Adjustment can be performed easily and in a short time. Further, it is not necessary to change the “pattern area ratio—ink fountain key opening amount conversion curve” common to each color determined by the printing machine manufacturer, and the adjustment operation can be simplified.

  Further, in the first reference example, since it is only necessary to store the “picture area ratio—ink fountain key opening amount conversion curve” common to each color in the memory 25, the storage capacity of the memory 25 can be greatly reduced. That is, in the conventional method, since the “picture area ratio−ink fountain key opening amount conversion curve” for each color is stored, an enormous storage capacity is required. It is only necessary to store the “ink fountain key opening amount conversion curve”, and a huge storage capacity is not required.

[Embodiment 1]
FIG. 6 is a block diagram showing Embodiment 1 of an ink supply amount adjusting apparatus for a multicolor printing machine according to the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same or equivalent components, and the description thereof is omitted.

  In addition to the configuration shown in FIG. 1, this ink supply amount adjusting device is provided with a memory 30 for storing a coefficient of ink feed amount for each color. The coefficient of the ink feed amount for each color is set to 1 when the printer manufacturer is shipped. In the first embodiment, the memory 26 stores only one reference ink feed amount common to each color at the time of shipment from the printer manufacturer. The reference ink feed amount common to each color is not rewritten as in the first reference example.

[Adjustment of ink fountain key opening amount and ink feed amount coefficient during adjustment before starting actual printing]
FIG. 7 is a flowchart for explaining a characteristic operation before the start of printing in the ink supply amount adjusting apparatus. In this ink supply amount adjusting device, before starting printing, the correction amount of the ink fountain key opening amount for each color in the memory 27 and the coefficient of the ink feed amount for each color in the memory 30 are adjusted. For this adjustment, the test printing plate 7A shown in FIG. 4 is used.

7 are the same as the processes of steps 101 to 107 and 113 to 115 in FIG.
If it is determined in step 307 that the density value needs to be adjusted, the operator sets the correction amount of the ink fountain key opening amount of each color stored in the memory 27 and the ink feed amount of each color stored in the memory 30. The coefficient is adjusted (step 308). That is, the value is increased or decreased while looking at the correction amount of the ink fountain key opening amount of each color and the coefficient of the ink feed amount displayed on the display 14. The adjusted ink fountain key opening correction amount and ink feed amount coefficient for each color are overwritten in the memories 27 and 30.

  The CPU 10 reads the adjustment amount of the ink fountain key of each color after adjustment from the memory 27 (step 309), and the ink fountain key of each color obtained in step 302 is the correction amount (increase / decrease value) of the read ink fountain key of each color. By adding to the reference opening amount of 4-1 to 4-n, that is, adding if the correction amount is positive, subtracting if the correction amount is negative, the opening amount of the ink fountain keys 4-1 to 4-n for each color Is corrected (step 310).

  The CPU 10 reads the adjusted ink feed amount coefficient of each color from the memory 30 (step 311), and multiplies the read ink feed amount coefficient of each color by the reference ink feed amount common to each color read in step 303. Thus, the ink feed amount of each color is corrected (step 312). Then, the opening amounts of the ink fountain keys 4-1 to 4-n for each color obtained in step 310 and the ink feed amount for each color obtained in step 312 are set via the ink fountain key drive device 28 and the ink fountain roller drive device 29 (step). 313).

[Ink supply amount setting method at the start of actual printing]
FIG. 8 is a flowchart for explaining a characteristic operation at the start of printing in the ink supply amount adjusting apparatus. 8 are the same as the processes in steps 201 to 204 in FIG. 3, and the description thereof is omitted.

  In this ink supply amount adjusting device, the CPU 10 reads the reference ink feed amount common to each color from the memory 26 in step 405, and then reads the coefficient of the ink feed amount of each color from the memory 30 (step 406). Then, the ink feed amount coefficient of each color read is multiplied by the reference ink feed amount common to each color read in step 405 to obtain a set value of the ink feed amount of each color (step 407).

Then, the CPU 10 sets the opening amount of the ink fountain keys 4-1 to 4-n for each color obtained in step 404 and the ink feed amount for each color obtained in step 407 via the ink fountain key drive device 28 and the ink fountain roller drive device 29. (Step 408) and printing is started (Step 409).
In the first embodiment, the ink feed amount of each color is corrected by multiplying by a coefficient. However, the correction value is obtained in the same manner as the ink fountain key opening amount, and the correction value is added to the reference ink feed amount. Even if is added, the same effect can be obtained.

[Reference Example 2]
FIG. 9 is a block diagram showing a reference example (reference example 2) before entering into the description of the embodiment 2 of the ink supply amount adjusting device of the multicolor printing machine according to the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same or equivalent components, and the description thereof is omitted.
In addition to the configuration shown in FIG. 1, this ink supply amount adjusting device is provided with a memory 31 for storing the zero position (origin position) of the ink fountain key opening amount for each color.

[Adjustment of ink fountain key opening amount and ink feed amount during adjustment before actual printing]
FIG. 10 is a flowchart for explaining the characteristic operation before the start of printing in the ink supply amount adjusting apparatus. In this ink supply amount adjusting device, before the start of printing, the ink fountain key opening amount correction amount for each color in the memory 27 and the ink feed amount for each color in the memory 26 are adjusted. For this adjustment, the test printing plate 7A shown in FIG. 4 is used. The processing in steps 501 to 515 in FIG. 10 is the same as the processing in steps 101 to 115 in FIG.

[Ink supply amount setting method at the start of actual printing]
FIG. 11 is a flowchart for explaining the operation at the start of printing in this ink supply amount adjusting apparatus.
In this ink supply amount adjusting device, the zero position of the ink fountain key opening amount of each color stored in the memory 31 is read (step 602), and the correction amount of the ink fountain key opening amount of each color stored in the memory 27 is read out. (Step 603) By adding a correction amount (increase / decrease value) of the ink fountain key opening amount of each color to the zero position of the ink fountain key opening amount of each color thus read, that is, if the correction amount is positive, add. For example, the zero position of the opening amount of the ink fountain key of each color is corrected by subtraction (step 604).

  After that, the CPU 10 determines the “image area ratio—ink fountain key common to each color stored in advance in the memory 25 according to the pattern area ratio of each area of the printing plate 7 for each color corresponding to the ink fountain keys 4-1 to 4-n. According to the “opening amount conversion curve”, the reference opening amount of each ink fountain key 4-1 to 4-n is obtained (step 605), and the corrected ink fountain key opening amount of each color obtained in step 604 and the step 605 The opening amount of each ink fountain key of each color is obtained from the reference opening amount of each ink fountain key of each color (step 606).

  Then, the CPU 10 reads the ink feed amount of each color from the memory 26 (step 607), and determines the ink feed amount of each color read and the opening amount of the ink fountain keys 4-1 to 4-n of each color obtained in step 606. Setting is made via the roller driving device 29 and the ink fountain key driving device 28 (step 608), and printing is started (step 609).

  In this case, the ink fountain keys 4-1 to 4-n for each color are set with reference to the zero position of the corrected ink fountain key for each color. That is, the ink fountain key specific to the printing company is set regardless of the pattern area ratio. Since the opening amount is set with reference to the zero position adjusted so as to obtain the reference density value of each color, the ink supply suitable from the beginning can be made by the combination with the setting of the ink feed amount of each color read from the memory 26. The quantity can be obtained.

[Embodiment 2]
FIG. 12 is a block diagram showing Embodiment 2 of an ink supply amount adjusting device for a multicolor printing machine according to the present invention. In the figure, the same reference numerals as those in FIG. 6 denote the same or equivalent components, and the description thereof will be omitted.
In addition to the configuration shown in FIG. 6, this ink supply amount adjusting device is provided with a memory 31 for storing the zero position (origin position) of the ink fountain key opening amount for each color.

[Adjustment of ink fountain key opening amount and ink feed amount coefficient during adjustment before actual printing]
FIG. 13 is a flowchart for explaining the characteristic operation before the start of printing in the ink supply amount adjusting apparatus. In this ink supply amount adjusting device, before starting printing, the correction amount of the ink fountain key opening amount for each color in the memory 27 and the coefficient of the ink feed amount for each color in the memory 30 are adjusted. For this adjustment, the test printing plate 7A shown in FIG. 4 is used. The processing in steps 701 to 716 in FIG. 13 is the same as the processing in steps 301 to 316 in FIG.

[Ink supply amount setting method at the start of actual printing]
FIG. 14 is a flowchart for explaining the operation at the start of printing in this ink supply amount adjusting apparatus.
In this ink supply amount adjusting device, the zero position of the opening amount of the ink fountain key of each color stored in the memory 31 is read (step 802), and the correction amount of the opening amount of the ink fountain key of each color stored in the memory 27 is read out. (Step 803) By adding the correction amount (increase / decrease value) of the ink fountain key for each color to the read zero position of the ink fountain key for each color, that is, if the correction amount is positive, add. For example, the zero position of the opening amount of the ink fountain key of each color is corrected by subtraction (step 804).

  After that, the CPU 10 determines the “image area ratio—ink fountain key common to each color stored in advance in the memory 25 according to the pattern area ratio of each area of the printing plate 7 for each color corresponding to the ink fountain keys 4-1 to 4-n. According to the “opening amount conversion curve”, the reference opening amount of the ink fountain keys 4-1 to 4-n for each color is obtained (step 805), and the zero position of the opening amount of the ink fountain key of each color corrected in step 804 and the step 805 The opening amount of each ink fountain key of each color is obtained from the reference opening amount of each ink fountain key of each color (step 806).

  The CPU 10 reads the reference ink feed amount common to each color from the memory 26 (step 807), and reads the coefficient of the ink feed amount for each color from the memory 30 (step 808). Then, the ink feed amount coefficient of each color read is multiplied by the reference ink feed amount common to each color read in step 807 to obtain a set value of the ink feed amount of each color (step 809).

  Then, the CPU 10 sets the opening amount of the ink fountain keys 4-1 to 4-n for each color obtained in step 806 and the ink feed amount for each color obtained in step 809 via the ink fountain key drive device 28 and the ink fountain roller drive device 29. (Step 810), printing is started (Step 811).

  In this case, the ink fountain keys 4-1 to 4-n for each color are set with reference to the zero position of the corrected ink fountain key for each color. That is, the ink fountain key specific to the printing company is set regardless of the pattern area ratio. Since the opening amount is set with reference to the zero position adjusted so that the reference density value of each color is obtained, the ink supply suitable from the beginning can be obtained by combining with the setting of the ink feed amount of each color obtained in step 809. The quantity can be obtained.

  In the second embodiment, the ink feed amount of each color is corrected by multiplying by a coefficient. However, a correction value is obtained in the same manner as the ink fountain key opening amount, and the correction value is set as the reference ink feed amount. Even if they are added, the same effect can be obtained.

It is a block diagram which shows the reference example 1 before entering into description of Embodiment 1 of the ink supply amount adjustment apparatus of the multi-color printing machine which concerns on this invention. It is a flowchart for demonstrating the operation | movement before the printing start in this ink supply amount adjustment apparatus. It is a flowchart for demonstrating the operation | movement at the time of the printing start in this ink supply amount adjustment apparatus. It is a figure which shows the printing plate for a test used when adjusting the correction amount of the opening amount of the ink fountain key before the printing start in this ink supply amount adjustment apparatus, and the ink feed amount. It is a figure explaining the parallel movement adjustment to the reference | standard density value of printing density by adjusting the opening amount and ink feed amount of an ink fountain key. It is a block diagram which shows Embodiment 1 of the ink supply amount adjustment apparatus of the multicolor printing machine which concerns on this invention. It is a flowchart for demonstrating the operation | movement before the printing start in this ink supply amount adjustment apparatus. It is a flowchart for demonstrating the operation | movement at the time of the printing start in this ink supply amount adjustment apparatus. It is a block diagram which shows the reference example 2 before starting description of Embodiment 2 of the ink supply amount adjustment apparatus of the multi-color printing machine which concerns on this invention. It is a flowchart for demonstrating the operation | movement before the printing start in this ink supply amount adjustment apparatus. It is a flowchart for demonstrating the operation | movement at the time of the printing start in this ink supply amount adjustment apparatus. It is a block diagram which shows Embodiment 2 of the ink supply amount adjustment apparatus of the multicolor printing machine which concerns on this invention. It is a flowchart for demonstrating the operation | movement before the printing start in this ink supply amount adjustment apparatus. It is a flowchart for demonstrating the operation | movement at the time of the printing start in this ink supply amount adjustment apparatus. It is a figure which shows the "pattern area ratio-ink fountain key opening amount conversion curve" of each color (for example, eye, red, ki, and sumi) in the past. It is a figure which shows the density | concentration at the time of calculating | requiring the opening amount of the ink fountain key of each color with the eye or red conversion curve, and printing. It is a figure which shows the principal part of the ink supply apparatus in the printing unit of each color in a rotary printing press. It is a figure which shows a 4-color rotary printing press.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Ink fountain, 2 ... Ink, 3 ... Ink fountain roller, 4 (4-1 to 4-n) ... Ink fountain key, 5 ... Ink transfer roller, 6 ... Ink roller group, 7 ... Printing plate, 7A ... Test plate , 7A1 ... color patch part, 7A2 ... pattern part for adjusting ink supply amount, 8 ... plate cylinder, 9-1 to 9-4 ... printing unit, 10 ... CPU, 11 ... ROM, 12 ... RAM, 13 ... switch group, DESCRIPTION OF SYMBOLS 14 ... Display device, 15 ... Drive device, 16 ... Printer, 17 ... Densitometer, 18 ... Printing plate area ratio measuring device, 19, 20 ... A / D converter, 21, 22, 23 ... Input / output interface (I / F, I / O), 24... Memory (for storing reference density values for each color), 25... Memory (for storing image area ratio common to each color-ink fountain key opening amount conversion curve storage), 26. (For feed amount storage), 27 Memory (for storing correction amount of ink fountain key opening amount for each color), 28 (23-1 to 23-n) ... ink fountain key drive device, 29 (29-1 to 29-4) ... ink fountain roller drive device, 30 ... memory (For storing coefficient of ink feed amount for each color), 31... Memory (for storing zero position of ink fountain key opening amount for each color).

Claims (10)

A plurality of ink fountain keys are provided. The amount of ink supplied to the ink fountain roller from within the ink fountain is adjusted by adjusting the opening amount of these ink fountain keys, and the ink fountain roller is supplied to the printing plate by adjusting the feed amount of the ink fountain roller. In a multicolor printing machine equipped with multiple printing units that adjust the amount of ink to be printed and print the ink supplied to this printing plate on printing paper,
According to the pattern area of each area of the printing plate corresponding to each ink fountain key of each color, the standard opening amount of each ink fountain key of each color is set according to the relationship between the pattern area ratio preset as common to each color and the opening amount of the ink fountain key. A first step to find,
The set value of the opening amount of each ink fountain key of each color is corrected by adding and subtracting the correction amount of the opening amount of the ink fountain key set in advance for each color, with the standard opening amount of each ink fountain key of each color obtained as a uniform value. A second step to find,
Ink fountain roller feed amount set for each color by correcting the standard fountain roller feed amount preset for each color with the ink fountain roller feed amount correction value set in advance for each color. And a third step for obtaining
The combination of the correction amount of the ink fountain key opening amount of each color in the second step and the correction value of the feed amount of the ink fountain roller of each color in the third step adjusts the parallel translation of the density value in the range of all the pattern areas of each color. A method for adjusting an ink supply amount of a multi-color printing machine, characterized in that the combination is possible. A plurality of ink fountain keys are provided. The amount of ink supplied to the ink fountain roller from within the ink fountain is adjusted by adjusting the opening amount of these ink fountain keys, and the ink fountain roller is supplied to the printing plate by adjusting the feed amount of the ink fountain roller. In a multicolor printing machine equipped with multiple printing units that adjust the amount of ink to be printed and print the ink supplied to this printing plate on printing paper,
A first step for presetting the correction amount of the ink fountain key opening amount for each color as a uniform value;
A second step of correcting the origin position of the opening amount of each ink fountain key of each color by adding and subtracting the correction amount of the opening amount of the ink fountain key for each color set;
According to the pattern area of each area of the plate corresponding to each ink fountain key of each color, the setting value of the opening amount of each ink fountain key of each color according to the relationship between the pattern area ratio preset as common to each color and the opening amount of the ink fountain key A third step for determining
Ink fountain roller feed amount set for each color by correcting the standard fountain roller feed amount preset for each color with the ink fountain roller feed amount correction value set in advance for each color. And a fourth step for obtaining
The combination of the correction amount of the ink fountain key opening amount of each color in the second step and the correction value of the feed amount of the ink fountain roller of each color in the fourth step adjusts the parallel translation of the density value in the range of all the pattern areas of each color. A method for adjusting an ink supply amount of a multi-color printing machine, characterized in that the combination is possible. In claim 1 or 2,
An ink supply amount adjustment method for a multicolor printing machine, wherein the correction amount and the correction value are rewritable. A plurality of ink fountain keys are provided. The amount of ink supplied to the ink fountain roller from within the ink fountain is adjusted by adjusting the opening amount of these ink fountain keys, and the ink fountain roller is supplied to the printing plate by adjusting the feed amount of the ink fountain roller. In a multicolor printing machine equipped with multiple printing units that adjust the amount of ink to be printed and print the ink supplied to this printing plate on printing paper,
According to the pattern area of each area of the printing plate corresponding to each ink fountain key of each color, the standard opening amount of each ink fountain key of each color is set according to the relationship between the pattern area ratio preset as common to each color and the opening amount of the ink fountain key. A first means for obtaining;
The ink fountain key opening of each color is corrected by adding and subtracting the correction amount of the ink fountain key opening amount preset for each color, with the standard opening amount of each ink fountain key of each color obtained by the first means as a uniform value. A second means for obtaining a set value of the quantity;
Ink fountain roller feed amount set for each color by correcting the standard fountain roller feed amount preset for each color with the ink fountain roller feed amount correction value set in advance for each color. And a third means for obtaining
The combination of the correction amount of the ink fountain key opening amount of each color of the second means and the correction value of the feed amount of the ink fountain roller of each color of the third means makes the density value parallel in the range of all the pattern areas of each color. An ink supply amount adjusting device for a multi-color printing machine, characterized in that the combination can be moved and adjusted. A plurality of ink fountain keys are provided. The amount of ink supplied to the ink fountain roller from within the ink fountain is adjusted by adjusting the opening amount of these ink fountain keys, and the ink fountain roller is supplied to the printing plate by adjusting the feed amount of the ink fountain roller. In a multicolor printing machine equipped with multiple printing units that adjust the amount of ink to be printed and print the ink supplied to this printing plate on printing paper,
A first means for correcting by adding or subtracting a correction amount of the ink fountain key opening amount for each color set in advance with the origin position of the ink fountain key opening amount of each color as a uniform value;
According to the pattern area of each area of the plate corresponding to each ink fountain key of each color, the setting value of the opening amount of each ink fountain key of each color according to the relationship between the pattern area ratio preset as common to each color and the opening amount of the ink fountain key A second means for obtaining
Ink fountain roller feed amount set for each color by correcting the standard fountain roller feed amount preset for each color with the ink fountain roller feed amount correction value set in advance for each color. And a third means for obtaining
The combination of the correction amount of the ink fountain key of each color of the first means and the correction value of the feed amount of the ink fountain roller of each color of the third means makes the density value parallel in the range of all the pattern areas of each color. An ink supply amount adjusting device for a multi-color printing machine, characterized in that the combination can be moved and adjusted. In claim 4 or 5,
An ink supply amount adjusting device for a multi-color printing machine, wherein the correction amount and the correction value are rewritable. In claim 1 or 2,
A test printing step of printing a printed material using a test printing plate of each color before starting actual printing using the printing plate of each color;
A density measuring step of measuring the density of each area corresponding to each ink fountain key of each color of a printed matter printed using the test printing plate of each color;
A density value determining step for determining whether or not the density value of each area corresponding to each ink fountain key of each color measured in this density measuring step and the reference density value of each color stored in advance all match;
Until it is determined that the density value of each area corresponding to each ink fountain key of each color matches the reference density value of each color by this density value judging step, the correction amount of the opening amount of the ink fountain key for each color or the above-mentioned for each color A step of repeating printing of a printed matter using the test printing plate of each color each time the correction value of the feed amount of the ink fountain roller is adjusted, Method. In claim 7,
The test printing plate for each color comprises a pattern in which the pattern area ratio in each area corresponding to each ink fountain key of each color gently changes along the direction in which the ink fountain keys are arranged,
The test printing step includes
According to the pattern area ratio in each area corresponding to each ink fountain key of each color of the test printing plate of each color, each ink fountain key of each color according to the relationship between the pattern area ratio preset as common to each color and the opening amount of the ink fountain key The reference opening amount is obtained, and the obtained reference opening amount is set as the setting value of the opening amount of each ink fountain key of each color, and the reference feeding amount of the ink fountain roller preset as common to each color is used as the ink fountain roller of each color. A method for adjusting an ink supply amount of a multi-color printing machine, wherein a printed matter is printed using the test printing plate for each color as the set value of the feed amount. In claim 4 or 5,
Test printing means for printing a printed material using a test printing plate for each color before starting actual printing using the printing plate for each color;
Density measuring means for measuring the density of each area corresponding to each ink fountain key of each color of a printed matter printed using the test printing plate of each color;
A density value judging means for judging whether or not the density values of the respective areas corresponding to the ink fountain keys of the respective colors measured by the density measuring means coincide with the reference density values of the respective colors stored in advance.
Until the density value determining means determines that the density value of each area corresponding to each ink fountain key of each color matches the reference density value of each color, the correction amount of the opening amount of the ink fountain key for each color or the aforementioned amount for each color Ink supply amount adjustment for a multicolor printing machine, comprising means for repeating printing of a printed matter using the test printing plate for each color each time the correction value of the feed amount of the ink fountain roller is adjusted apparatus. In claim 9,
The test printing plate for each color comprises a pattern in which the pattern area ratio in each area corresponding to each ink fountain key of each color gently changes along the direction in which the ink fountain keys are arranged,
The test printing means includes
According to the pattern area ratio in each area corresponding to each ink fountain key of each color of the test printing plate of each color, each ink fountain key of each color according to the relationship between the pattern area ratio preset as common to each color and the opening amount of the ink fountain key The reference opening amount is obtained, and the obtained reference opening amount is set as the setting value of the opening amount of each ink fountain key of each color, and the reference feeding amount of the ink fountain roller preset as common to each color is used as the ink fountain roller of each color. An ink supply amount adjustment device for a multi-color printing machine, wherein a printed matter is printed using the test printing plate of each color as a set value of the feed amount of the ink.

Images