JPH0493255A - Ink supply amount preset device - Google Patents

Abstract

PURPOSE:To obtain an ink supply amount preset device capable of accurately presetting an ink supply amount according to a pattern by determining an ink call frequency and ink key opening in each pattern printing, and presetting the ink supply amount on the basis of the ink call frequency and ink key opening. CONSTITUTION:An ink supply amount preset operating board 12 detects an ink key correction factor corresponding to an ink call frequency set value on the basis of a correction factor curve, and calculates the ink key correction factor according to each ink zone each color. After that, in each ink zone, the ink supply amount preset operating board 12 corrects an ink key operating reference value with use of the ink key factor in each color. The determined ink call frequency set value and corrected ink key opening value are transmitted to an ink supply amount adjusting device 13. Namely, in each ink zone, it is possible to preset the ink supply amount in terms of the ink call frequency set value and the ink key opening value to the ink supply amount adjusting device 1-3 for each color.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is an ink system for presetting the ink supply amount for each predetermined ink zone for each color of the pattern when printing a pattern (including characters, etc.). The present invention relates to a supply amount presetting device.

(Prior art) In general, an ink supply device, that is, an ink fountain, is composed of an ink source roller, an ink blade, etc. The amount of ink supplied is controlled by adjusting the gap between

In this way, the ink supply amount adjustment device has two adjustment functions: adjusting the rotation angle of the ink source roller (ink delivery amount), which adjusts the ink feed amount at a constant rate, and adjusting the ink key opening degree. Now, the ink film thickness is quantitatively adjusted. Normally, during printing work, the ink supply amount is set in the horizontal direction of the printed matter (depending on the size of the pattern in each ink zone) by adjusting the ink key opening, and the ink supply amount is set depending on the size of the pattern in the entire printed material. This is done by adjusting the amount of calls.

There is an ideal combination of ink delivery amount and ink key opening settings depending on the pattern to be printed, but if you decide the ink delivery value for each pattern and then set the ink key opening degree for that calling value, you will have to set a large number of ink keys. Requires an opening conversion curve.

Furthermore, when printing patterns, it is necessary to preset ink supply amounts for each color and for each ink zone in accordance with various patterns.

For this reason, conventionally, when presetting the ink supply amount, the so-called ink call rate is set to a constant value, and the area ratio (picture area ratio) occupied by each color of each pattern in the pattern and the ink key opening degree are calculated. A conversion rate curve is determined by determining the relationship between the two, and the ink key opening degree is determined each time using these conversion rate curves for each pattern to be printed. Then, the ink supply amount is determined based on the ink opening degree and ink call rate determined in this way, and this ink supply amount is preset. That is, the current state of the conventional ink supply amount presetting device is to use a presetting method in which the set value of the ink supply amount is constant and only the ink key opening degree is set according to the picture area ratio.

(Problem to be solved by the invention) By the way, conventionally, when presetting the ink supply amount,
As mentioned above, it is necessary to preset the ink supply amount by determining the ink key opening degree each time using the conversion rate curve for each pattern. Therefore, in order to preset the ink supply amount, the above-mentioned conversion rate curves must be determined in advance for various patterns. In other words, an extremely large number of conversion rate curves must be prepared in advance.

For this reason, if you have no choice but to keep the ink flow rate constant and rely only on adjusting the ink key opening, you will not be able to achieve high preset accuracy (the burden of manual correction will be large, and the preset method with a constant ink flow rate will not be able to supply the ink properly. After the quantities are manually modified, it is difficult to modify the conversion curve based on the results to obtain high preset accuracy.

In other words, if only either the ink supply amount or the ink key opening is manually corrected, the conversion curve can be corrected relatively easily, but such cases are extremely rare, and both set amounts must be manually corrected. There is a problem in that it is very difficult to determine the correction rate (amount) for correcting the conversion curve, and it takes a lot of time to make the correction.

SUMMARY OF THE INVENTION An object of the present invention is to provide an ink supply amount presetting device that can preset an ink supply amount with extremely high accuracy in accordance with a pattern.

(Means for Solving the Problems) According to the present invention, when printing a pattern, there is provided an ink supply amount presetting device that presets the ink supply amount for each color of the pattern divided into each ink zone. A printing plate pattern area ratio meter that calculates the total pattern area ratio occupied by each color and/or the zone pattern area ratio for each ink zone and sends these as pattern area ratio data, and the total pattern area ratio or the zone pattern. A first storage means stores the relationship between the average picture area ratio indicating the total average value of the area ratio and the ink call rate as an ink call rate conversion curve for each color, and the relationship between the zone picture area ratio and the reference ink key opening degree. a second storage means in which the relationship between the ink recall rate and the ink key correction opening is stored for each color as a master curve; a third storage means in which the relationship between the ink recall rate and the ink key correction opening degree is stored for each color as a correction rate curve; A first step that receives the rate data, calculates the ink call rate corresponding to the picture area rate data from the ink call rate conversion curve, and sets the ink call rate setting value as the ink call rate setting value.
and a second search means that receives the zone pattern area ratio, determines a reference ink key opening corresponding to the zone pattern area ratio from the master curve for each ink zone, and sets the result as an ink key opening reference value. a third retrieval means that receives the ink call rate setting value, calculates an ink key opening correction factor corresponding to the ink call rate set value from the correction rate curve, and uses the ink key opening correction factor as a correction factor; and the ink key opening reference value. determining means for determining an ink key opening value by correcting the ink key opening value using the correction factor, and determining an ink supply amount based on the ink key opening value and the ink call rate setting value, and presetting the ink supply amount. An ink supply amount presetting device is obtained.

(Function) In the present invention, the total pattern area ratio or the average pattern area ratio of the pattern is obtained from the pattern to be printed. Then, for each color, the ink call rate corresponding to the total picture area ratio or the average picture area rate is determined as the ink call rate setting value from the ink call rate conversion curve. Further, the reference ink key opening degree corresponding to the image area ratio data of each zone is determined as the ink key opening degree reference value from the master curve for each ink zone.

Then, an ink key opening correction value corresponding to the ink calling rate set value is determined as a correction factor, and the ink key opening degree reference value is corrected with a correction coefficient to determine the ink key opening value. The ink supply amount is determined and preset from these ink key opening value and ink call rate set value. As described above, in the present invention, the ink call rate and ink key opening degree are determined each time a pattern is printed, and the ink supply amount can be easily preset based on these ink call rate and ink key opening degree.

Moreover, it is only necessary to set a correction rate curve for each color type, and there is no need to create a large number of change rate curves and master curves as in the past.

(Example) The present invention will be explained below with reference to Examples.

Referring to FIG. 1, the ink supply amount presetting device according to the present invention is equipped with a printing plate pattern area ratio meter 11 and an ink supply amount presetting operation panel 12, and as described later, the ink supply amount presetting operation panel 12 Supply amount adjustment device 13
The ink supply amount is preset for each color of the image on the printing plate. Here, the term "picture" includes letters and the like.

A pattern to be printed (hereinafter referred to as a printed pattern) is printed on the printing plate, and the printing plate pattern area ratio meter 11 divides the printing pattern into ink zones when printing, and calculates the proportion of each ink zone to the entire pattern. The area ratio (rate) (%) for each color is calculated as a zone pattern area ratio for each color and is provided to the ink supply amount presetting operation panel 12.

The ink supply amount presetting operation panel 12 receives the zone picture area ratio for each color on the printing plate, and calculates the average picture area ratio for each color by averaging the picture area ratio for each ink zone.

In addition, as an alternative to this, this average picture area ratio can be determined by calculating the total picture area (rate) for each color occupied by each color for the picture to be printed (overall), along with the zone picture area ratio using the printing plate picture area ratio meter 11. ) may be calculated and provided to the preset operation panel 12.

Further, the ink supply amount preset operation panel 12 is provided with three types of conversion curves (functions) for each color. That is, an ink call conversion curve, a master curve, and an ink key opening correction rate curve are provided for each color.

As shown in FIG. 2, the ink call ratio conversion curve represents the relationship between the average pattern area ratio or the total pattern area (ratio) and the ink call rate. Here, the ink volume is the ink fountain (
represents the ink delivery rate from the tank (not shown).

In addition, as shown in Figure 3, the master curve represents the relationship between the zone pattern area ratio and the ink key opening reference value. For example, the zone pattern area ratio and the ink key opening when the ink call rate is 20%. relationship is set.

Further, as shown in FIG. 4, the correction rate curve represents the relationship between the ink recall rate and the ink key correction rate. Since the above-mentioned master curve is set based on an ink call-up rate of a predetermined rate (for example, 20%), this correction rate curve is determined based on the ink key opening corresponding to an ink call-up rate other than the predetermined rate, as described later. It is used when finding.

The ink supply amount operation panel 12 searches the ink call rate conversion curve for each color for the ink call rate corresponding to the average picture area rate or the total picture area rate, and determines the ink call rate set value for each color.

Further, the ink key opening degree of each color is determined for each ink zone using the zone pattern area ratio. That is, the ink supply amount preset operation panel 12 searches the master curve for the reference ink key opening corresponding to the zone pattern area ratio, and
An ink key opening reference value is determined for each color and corresponding to each ink zone (these ink key opening reference values correspond to an ink call rate of 20%). Note that the ink supply amount preset operation panel 12 is provided with a correction section (not shown), and by operating this correction section, the zone pattern area ratio and ink key opening degree can be adjusted in the master curve shown in FIG. The relationship with the reference value can be varied, for example, in a range of 0.5 to 1.4 times.

Further, the ink supply amount preset operation panel 12 uses the ink call rate set value for each color to determine an ink key opening correction factor corresponding to the ink call rate set value. That is, the ink supply amount preset operation panel 12 retrieves the ink key correction factor corresponding to the ink change rate setting value from the correction factor curve, and determines the ink key correction factor for each color and for each ink zone.

Thereafter, the ink supply amount preset operation panel 12 corrects the ink key opening reference value using the ink key correction factor in each ink zone for each color to obtain a corrected ink key opening value.

The ink call rate setting value and corrected ink key opening value determined as described above are sent to the ink supply amount adjusting device 13. That is, the ink supply amount indicated by the ink call rate setting value and the corrected ink key opening value is preset in the ink supply amount adjustment device 13 for each ink zone for each color.

Note that if there is a part of the ink key opening degree for each ink zone calculated in this way that exceeds a predetermined value (for example, the ink film thickness on the ink source roller is about 200 μm),
The operation of upwardly correcting the ink call rate and correcting the ink key opening degree is repeated until there are no portions exceeding a predetermined value.

This is because when the key opening exceeds a predetermined value, the ink calling efficiency suddenly decreases, the ink supply state becomes unstable, and the preset accuracy decreases.

In this way, the ink supply amount adjusting device 13 adjusts the ink call rate setting value corresponding to all the ink zones for each color on the printing plate.
The ink supply amount adjusting device 1 presets the correction ink key opening value for each color and for each ink zone.
Preset to 3.

In other words, since the ink call-up rate and ink key opening degree are preset for each color and each ink zone, it is possible to print the pattern on the printing plate with extreme precision.

Then, by actually executing printing, evaluating the print quality of the printed material, and correcting the master curve in the correction section based on the evaluation results, it is possible to preset the ink supply amount with higher precision.

In addition, when manually correcting the ink supply amount setting value, the ink supply amount setting value when several dozen sheets are printed, that is, the ink call rate setting value, the ink key opening setting value, and the image area ratio data are accumulated. Then, by analyzing and back-calculating the data to calculate the correction coefficient for the ink key opening conversion rate and automatically correcting the master curve, it is possible to maintain high preset accuracy at all times.

(Effects of the Invention) As explained above, in the present invention, it is possible to accurately preset the ink supply amount for each color of the pattern on the printing plate and the ink supply amount indicated by the ink key opening degree in the ink supply amount adjustment device. can.

In addition, by using the ink key opening correction rate curve, the optimal ink call rate can be selected depending on the amount of the entire pattern to be printed without having to prepare a large number of conversion curves, and a stable ink supply amount can be obtained with the ink key opening. Can be set to a range. Therefore, it is possible to match the inking characteristics peculiar to various printing machines, and it is possible to perform highly accurate and ideal presetting.

Further, by automatically correcting the master curve based on the manually corrected ink supply amount setting data, there is an effect that a highly accurate preset state can be maintained at all times.

A diagram showing the relationship between the pattern area ratio or the total pattern area (rate) and the ink call-up rate. Figure 3 is a diagram showing the relationship between the design area ratio and the ink key opening reference value. Figure 4 shows the relationship between the ink call rate and the ink key. FIG. 7 is a diagram showing the relationship with the opening degree correction factor.

11... Printing plate pattern area ratio meter, 12... Ink supply amount preset operation panel, 13... Ink supply amount adjustment device (
ink pot).

[Brief explanation of drawings]

Claims (1)

[Claims] 1. An ink supply amount presetting device that presets the ink supply amount for each color of the pattern divided into each ink zone when printing a pattern, and is configured to calculate the total area ratio of the pattern occupied by each color and/or A printing plate pattern area ratio meter that calculates the zone pattern area ratio for each ink zone and sends these as pattern area ratio data, and an average pattern area ratio that indicates the total pattern area ratio or the total average value of the zone pattern area ratio. A first storage means in which the relationship with the ink recall rate is stored for each color as an ink recall rate conversion curve, and a second storage means in which the relationship between the zone pattern area ratio and the reference ink key opening degree is stored for each color as a master curve. a third storage means in which the relationship between the ink recall rate and the ink key correction opening degree is stored for each color as a correction rate curve; a first search means that obtains an ink call-up rate corresponding to the area rate data from the ink call-up rate conversion curve and sets it as an ink call-up rate set value; and a standard that receives the zone pattern area rate and corresponds to the zone pattern area rate. a second retrieval means that obtains an ink key opening degree from the master curve for each ink zone and uses it as an ink key opening reference value; a third retrieval means that calculates a degree correction factor from the correction factor curve and uses it as a correction factor; and a determining means that corrects the ink key opening degree reference value with the correction factor to determine the ink key opening degree value;
An ink supply amount presetting device characterized in that an ink supply amount is determined based on the ink key opening value and the ink call rate setting value, and the ink supply amount is preset.