JP4344432B2 - Ink key preset value correction method for printing plate area data - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ink preset for a printing press, and more particularly to a method for correcting an ink key preset value based on printing plate area ratio data.
[0002]
[Prior art]
Usually, the ink preset in a printing press is as already known from Japanese Patent Application Laid-Open No. 63-216745. In other words, the pattern area ratio for each ink zone of the printing plate used for printing is measured in advance, and the opening amount of the ink key corresponding to the ink zone is adjusted in advance based on this measured value to minimize the preparation time. The measurement of the pattern area ratio is a technique for measuring the pattern area ratio for each ink zone equally divided into a certain width as disclosed in JP-A-7-89055. This is performed by photoelectrically measuring with a reflected light amount measuring type sensor, and the measured value is digitized and used for setting the opening amount of the ink key.
[0003]
Further, a skilled operator does not directly use the pattern area ratio of each ink zone obtained as described above as the opening amount of the ink key. That is, the operator, for example, zone No. If the measured values of the pattern area ratios of 5, 6, 7, and 8 are 0, 100, 0, and 100, the opening amount of the ink key is not set to 0, 100, 0, and 100, but 25, 75, The actual ink presetting is performed by fine adjustment empirically taking into account the measured values of the adjacent ink zones, such as 25.75. This is because there is a limit to the setting of the ink supply amount of the zone division type because the ink roller oscillates in the ink supply device, and the more excellent the operator, the more fine adjustment based on experience is required.
[0004]
Therefore, recently, a method for setting the pattern area ratio of a printing plate as disclosed in JP-A-10-315437 has been developed. The purpose of this conventional method is to obtain a very practical printing plate area ratio setting method following the fine adjustment technology possessed by an excellent operator. It is characterized by the fact that the image area ratio of the ink zone is calculated by taking in the measured values obtained by shifting the specific interval, and the mechanism is that the pattern area ratio of each equally divided ink zone It is a method of setting by measuring with a photoelectric sensor having a pattern area ratio of the ink zone by adding a measured value obtained by shifting the measured value of a desired ink zone by a specific interval in the front-rear direction of the ink zone The method of setting the pattern area ratio of the printing plate to be performed "(refer to the claims).
[0005]
Further, this conventional method does not directly use the measured value An for setting the opening amount of the ink key as shown in FIGS. 3 and 4, but uses the sensor 13 in the front-rear direction of the ink zone An, for example, the zone width P. In this case, the measurement results obtained in the virtual zone shifted by half the pitch are Bn and Bn + 1, respectively, and the desired setting value Dn of the nth ink zone is the measured value of zone n. In consideration of not only An but also the adjacent region, the calculation is performed by taking into account the measured values Bn and Bn + 1 of the virtual zone measured by shifting by a half pitch. That is, Dn = Bn / 4 + An / 2 + Bn + 1/4, and Dn is finally determined as a weighted value taking into account 50% of An and 25% of Bn · Bn + 1. In addition, 11 is a printing plate, 12 is a pattern, and 13 is a photoelectric sensor.
[0006]
The conventional method configured in this way is a method in which the pattern area ratio of each equally divided ink zone is measured and set by a photoelectric sensor having a measurement area of a certain width. That is, this photoelectric sensor adjusts the pattern area ratio data for the ink key zone to the pattern area ratio data measured by shifting the ink key zone at a specific interval, and this adjustment data is influenced by the left and right pattern amounts for the ink key zone. Is adjusted to calculate the pattern area ratio data, and further converted into the ink fountain key opening and preset to the ink fountain key.
[0007]
[Problems to be solved by the invention]
In the present invention, the ink key opening correction amount is calculated from the left and right ink key opening and the ink key preset data is corrected to obtain an appropriate ink key opening, without using the conventional method of measuring the pattern area ratio by the photoelectric sensor. Has a problem to be solved.
[0008]
[Means for Solving the Problems]
The present invention has been developed to solve the above-described problems, and in a method for setting the ink key opening according to the pattern area ratio of each equally divided ink key zone, the preset data for each ink key opening is used. In contrast, the amount of ink flowing to the left or right or the amount of ink flowing from the left or right is corrected, and the total of the ink key opening of the ink key preset data before and after correction in this correction step is compared with the correction step for obtaining the appropriate ink key opening for the printed matter. , Ru ink key preset values correction method der of the plate image area ratio data, characterized in that a confirmation step of confirming the appropriateness of the correction value.
[0009]
That is, an object of the present invention is to calculate the amount of ink that diffuses in the left-right direction on the ink roller and to correct the ink key preset data to obtain an appropriate ink key opening, and the configuration is desired ink key preset data. On the other hand, the difference between the left and right ink key openings is obtained, the desired ink key preset data is corrected, and the appropriate ink key opening is obtained. That is, the present invention calculates the difference between the ink key opening degree adjacent to the left and right with respect to the desired ink key preset data, and calculates the ink inflow and outflow based on this difference to correct the desired ink key preset data. Is added to obtain the key opening in the proper printing state, and the total of the corrected ink key preset data is compared with the total of the ink key preset data before correction to check whether the correction value is appropriate. It is a method to do.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention relates to a method for setting an ink key opening according to a pattern area ratio of individual ink key zones that are equally divided, and an ink amount that flows to the left or right with respect to preset data of each ink key opening or ink that flows from the left and right A correction process that corrects the amount and finds the appropriate ink key opening for the printed material, and a confirmation process that compares the total ink key opening of the ink key preset data before and after correction in this correction process to confirm the correctness of the correction value. Since the ink key preset value correction method for printing plate pattern area ratio data is characterized in that it is provided , correction data can be obtained for the ink fountain key without using a pattern area ratio meter using a conventional photoelectric sensor. it can.
[0011]
Further embodiments of the present invention includes a conversion step of converting the ink key opening of the image area ratio data in accordance with a predetermined calculation formula for Inkikizo over emissions, the key of the left and right after conversion into an ink key opening by said conversion step A data correction step for correcting the pattern area ratio data by calculating a difference in the opening amount, and a left and right ink amount calculated by the data correction step when there is an extreme difference in left and right ink key openings in the data correction step If the pattern area ratio data corrected for the influence of the negative value is a negative value, the value is distributed to the pattern area ratio data for the left and right ink key zones to make a positive value, and the data correction process or the distribution process An opening degree determining step for determining a value obtained according to a predetermined calculation formula from the corrected pattern area ratio data obtained as a final ink key opening degree; A preset process for presetting the final ink key opening degree determined by the open degree determining process in the ink fountain key, a ink key preset values correction method of the plate image area ratio data, characterized in that it consists of, the opening further in this method A comparison step for comparing the sum of the final ink key openings obtained in the determination step with the sum of the ink key openings before correction obtained in the conversion step before correction, and the difference between the sums in the comparison step being a predetermined value In this case , the ink key preset value correction method further includes an error display step for displaying an error, so that the amount of ink diffusing left and right on the ink roller is calculated and corrected to ink key preset data. And an appropriate ink key opening degree of the printed matter can be obtained.
[0012]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 show a method for correcting ink key preset values of printing plate pattern area data according to the present invention. The present invention is an improvement of a conventional printing plate pattern area ratio measuring method (Japanese Patent Laid-Open No. 10-315437), and can be carried out without using a pattern area ratio meter using a photoelectric sensor or the like. Therefore, only the features will be described.
[0013]
First, the pattern area ratio data for the ink keyzone is converted into the ink fountain key opening, and the difference in the amount of opening between the left and right ink keys is calculated to correct the ink amount. With the given correction, the ink key opening degree that corrects the influence of the right and left ink amounts can be preset in the ink fountain key.
Next, the concrete implementation method of the present invention is carried out by the following method.
(1) Convert the pattern area ratio data to the ink key opening.
(2) The difference between the left and right ink key openings is calculated.
(3) The amount of ink flowing to the left and right is calculated based on the calculated value.
(4) The pattern area ratio data is corrected based on the calculated ink amount.
(5) If there is an extreme difference between the left and right ink key openings, the pattern area value may be negative. Sort out.
(6) In order to confirm the above calculation, the total of the pattern area ratio before correction and the total of the corrected value are compared. If the value exceeds a certain value, an error message is displayed. . At this time, a calculation formula that obtains an appropriate correction value is automatically selected by calculation using a manual correction or a calculation formula given another correction value.
[0014]
【The invention's effect】
The present invention corrects the amount of ink flowing from side to side or the amount of ink flowing from the left and right with respect to preset data of each ink key opening in a method of setting the ink key opening by the pattern area ratio of each divided ink key zone. And a correction process for obtaining an appropriate ink key opening for the printed material, and a confirmation process for comparing the ink key opening data of the ink key preset data before and after correction in this correction process to confirm the correctness of the correction value. the a ink key preset values correction method of the plate image area ratio data, wherein, also, a conversion step of converting the ink key opening of the image area ratio data in accordance with a predetermined calculation formula for Inkikizo over emissions, by the conversion step after conversion to the ink key openings to calculate the difference between the opening amount of the left and right keys to correct the image area ratio data If the data correcting step, the data correcting step in the right and left image area ratio data when there is an extreme difference in the ink key opening degree correcting the influence of the amount of ink left calculated by the data correcting step becomes a negative value The value is assigned to the pattern area ratio data for the left and right ink key zones and assigned to a positive value, and a predetermined calculation formula is obtained from the corrected pattern area ratio data obtained through the data correction process or the distribution process. And a preset step for presetting the final ink key opening determined in the opening determination step in the ink fountain key. an ink key preset value correcting method of area ratio data, the final obtained in addition the opening determining step in this process A comparison process that compares the sum of the ink key openings with the sum of the ink key openings before correction obtained in the conversion process before correction, and an error if the difference between the sums in the comparison process exceeds a predetermined value Since the ink key preset value correcting method further includes an error display step for displaying, the following many effects that cannot be obtained by the conventional method can be obtained.
A. The correction value can be calculated regardless of the pattern area ratio meter using a photoelectric sensor or the like as in the conventional method.
B) The correction value can be calculated by simple and easy calculation.
C. Correction for the ink key opening data, regardless of the format of the pattern area ratio data, for example, based on the data of the pattern area ratio meter (plate scanner), the manual input by the digital data operator from the computer, etc. It is possible to cope with the ink key opening made.
D. For the printing operator, since the color tone is adjusted during printing by adjusting the ink key opening, correction by the ink key opening is intuitively easier to understand.
Depending on the print pattern, correction may not be possible with just one correction formula. In such a case, the total of the ink key preset data is compared with the total of the ink key preset data before correction to confirm that the correction value is appropriate. Can do.
If the correction value is not correct, an error message is output, and manual correction or some other correction calculation formula can be used to automatically perform the optimal correction. It is possible to prevent the occurrence of defects.
[Brief description of the drawings]
FIG. 1 is an explanatory schematic diagram showing a method of the present invention.
FIG. 2 is an explanatory schematic diagram showing the method of the present invention.
FIG. 3 is an explanatory schematic diagram showing a conventional method.
FIG. 4 is an explanatory schematic diagram showing a conventional method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Ink fountain key 2 Ink base roller 3 Printing plate 12 Picture 13 Photoelectric sensor A Digital data B Color control stand C Printing machine

Claims (1)

  In the method of setting the ink key opening according to the pattern area ratio of each equally divided ink key zone, the amount of ink flowing to the left or right or the amount of ink flowing from the left or right is corrected for the preset data of each ink key opening, and printed A correction step for obtaining an appropriate ink key opening and a confirmation step for comparing the sum of the ink key opening of the ink key preset data before and after the correction in the correction step to confirm the correctness of the correction value are provided. Ink key preset value correction method for printing plate area data.

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