JPH081914A - Ink supply amount presetting device - Google Patents

Abstract

PURPOSE:To shorten time required for color matching to sample printing, and to reduce the amount of spoilage required for color matching by a method wherein conversion formula for printing conditions affecting greatly the printing density is renewed constantly, based on the latest data (picture area ratio data or the like), and accuracy of presetting is improved therewith. CONSTITUTION:A picture area ratio data inputting part 1 receives picture area ratio for each of ink keys in the breadthwise direction of matters to be printed. A set value data inputting part 2 receives set value data for supply amount of ink after color matching to each of the ink keys. A printing condition data inputting part 8 receives printing condition data for printing speed on color matching or the like. A past data renewal/storage device 3 executes constantly renewal and storage of data inputted to each of the parts. A conversion formula computing part 4 calculates conversion formula for seeking ink supply amount setting value from picture area ratio. A preset value computing part 5 calculates ink supply amount in accordance with the conversion formula. Furthermore, an output part 6 for outputting to an ink supply amount adjustment device outputs the preset value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply amount presetting device for a printing machine.

[0002]

2. Description of the Related Art The ink supply of a printing machine will be described by taking an example of a sheet-fed printing machine. In a sheet-fed printing press, the amount of ink supplied on the printing paper surface is set by the number of rotations of the ink source roller and the opening degree of each ink key provided in each ink supply division area. At present, preset values for the number of rotations of these ink source rollers and the opening degree of each ink key before the start of printing are determined by the following procedure. Regarding the pattern to be printed, the area ratio to which the ink should adhere on the printed matter, that is, the pattern area ratio is measured for each ink key in the width direction. By substituting the pattern area ratio for each ink key into a predetermined conversion formula, the rotational speed of the ink source roller and the opening degree of the ink key, which are set values, are obtained.

The conversion formula used here is one determined formula, which is obtained by the following experiment. <Conversion formula determination method> (a) Print some typical print patterns,
Manually adjust the opening of each ink key to best match the sample print. The other set amount, the rotation speed of the ink source roller, is kept constant. (B) The relationship between the pattern area ratio and the ink key opening at this time for each pattern and each ink key is plotted as shown in FIG. (C) A conversion formula is obtained by mathematically expressing the approximated curve E at each plotted point in FIG.

The scatter of the plot points shown in FIG. 2 is because the conversion function itself is changed due to the change of the printing conditions. In the example of FIG. 2, the experiment is performed in a relatively short time, and the fluctuation amount is not large. However, as the number of days elapsed from the time when the conversion formula is determined increases, the variation amount of the printing condition increases, and the determined conversion formula includes a considerable error.

For this reason, immediately after determining the conversion formula, it was possible to match the color to the sample print with almost no correction of the preset value, but as the number of elapsed days increased, the color was changed to the sample print. It will need a lot of modification to fit. Such an increase in color correction is undesirable because it causes problems such as an increase in preparation time for printing and an increase in waste paper for color matching.

With the aim of preventing the accuracy of the conversion formula from deteriorating due to the increase in the number of elapsed days as described above, each time the print pattern changes at each of the ink key locations, the number of prints is always the predetermined number from that point. The conversion formula for calculating the preset value by the regression analysis based on the pattern area ratio data of the past print pattern and the ink key opening data after the operator has performed color matching There has been proposed a method of obtaining a preset value for a pattern to be printed from now on.

[0007]

Even if the method of obtaining the preset value is used, it may not be possible to completely correct the deterioration of the accuracy of the conversion formula due to the increase in the number of days elapsed. This depends on the temperature of the ink source roller, the printing speed, and the quality of the printed paper (art paper, coated paper, or high-quality paper) even if the number of revolutions of the ink source roller and the opening of the ink key are constant. The cause is that the ink supply amount, that is, the solid density changes as shown in FIGS. 3, 4, and 5, respectively.

The present invention is proposed in view of the above problems, and an object of the invention is to supply an ink capable of shortening a color matching time with a printed matter of a sample and reducing waste paper for color matching. The point is to provide a quantity presetting device.

[0009]

In order to achieve the above object, the ink supply amount preset device of the present invention uses a pattern area ratio data for each ink key in the width direction of a printed material, that is, an ink is printed on the printed material. A pattern area ratio data input section that receives the data of the area ratio of the portion to be attached, and a set value data input section that receives the set value data of the ink supply amount for each ink key after starting printing and performing color matching by the operator , The print condition data input section that receives print condition data such as print speed, paper quality, ink source roller temperature at the time of color matching, etc. A past data updating / storing device that stores while updating, and an approximate expression for obtaining the set value of the ink supply amount from the pattern area ratio based on the stored data, that is, conversion And a conversion formula calculation unit for calculating the conversion formula obtained by the conversion formula calculation unit to calculate the pattern area ratio for each ink key from the pattern area ratio data input unit and the color matching from the printing condition data input unit. Print speed, paper quality,
A preset value calculation unit that uses a conversion formula to calculate the set value of the ink supply amount for each ink key by substituting the ink source roller temperature, and the set value obtained by the preset value calculation unit is received and used as the ink supply amount. The ink supply amount adjusting device outputs a preset value to the adjusting device.

[0010]

The preset device for the ink supply amount of the present invention is configured as described above, and the printing conditions that have a large effect on the printing density are always past data close to the present time (picture area ratio data, the operator color Ink supply amount data after matching, printing speed data at color matching, ink source roller temperature data and paper quality data)
Since the conversion formula is updated, the preset accuracy is greatly improved.

[0011]

EXAMPLE An ink supply amount presetting device according to the present invention will now be described with reference to an embodiment shown in FIG. 1, in which 1 is a pattern area ratio data A ₁ for each ink key in the width direction of a printed matter,
A ₂ , ... A _n , that is, a pattern area ratio data input unit that receives data of the area ratio of the portion to which the ink should be attached on the printed matter.

The set value data of the ink supply amount for each ink key after the start of printing by 2 and color matching by the operator (ink source roller rotation speed (N), ink key opening (G ₁ , G ₂ , ...). _Gn ) is a set value data input unit 8 is a print condition data input unit that receives print condition data such as print speed (V), paper quality (P), ink source roller temperature (T) during color matching Is.

Reference numeral 3 denotes a past data (m number) updating / storing device which stores while constantly updating the data of each of the input sections 1, 2, and 8 with respect to a past fixed number of print patterns from the present time. Reference numeral 4 denotes a conversion formula calculation unit for calculating an approximation formula for obtaining the set value of the ink supply amount from the pattern area ratio based on the stored data, that is, a conversion formula.

5 is a conversion formula obtained by the conversion formula calculation unit 4, and the pattern area ratio for each ink key from the pattern area ratio data input unit 1 and the printing at the time of color matching from the printing condition data input unit 8 are printed. The preset value calculation unit is a conversion formula that calculates the set value of the ink supply amount for each ink key by substituting the speed (V), paper quality (P), and ink source roller temperature (T).

6 is obtained by the preset value calculation unit 5.
Received the set value and sent it to the ink supply amount adjusting device.
Output to the ink supply amount adjustment device that outputs as a reset value
It is a force. Next, the ink supply amount preset shown in FIG.
The operation of the input device will be specifically described. Printing is now open
For the printing pattern you are about to start,
Each ink key in the width direction measured using the
Pattern area ratio data (A) ₁, A₂・ ・ ・ A_n)
Is received by the pattern area ratio data input unit 1.

Also, the printing speed (V) at the time of color matching and the paper quality
(P), printing condition data such as ink source roller temperature (T)
Is received by the print condition input unit 8. And these de
The data is sent to the preset value calculation device 5 by the conversion formula. This
In the preset value calculation unit 5, the conversion formula calculation unit 4 determines
The preset value, that is, the ink source roller
Rotation amount (Np) and ink key opening (Gp₁, G
p ₂・ ・ ・ Gp_n) Is calculated.

In the conversion formula calculation unit 4, the data stored in the past data updating / storing device 3, that is, the pattern area ratio data, the printing speed data, the ink source data for the print patterns past the present by a certain number (m) are printed. A conversion formula is estimated and calculated based on the roller temperature data, the paper quality data, the ink source roller rotation amount, and the ink key opening data. Here, the procedure of the conversion formula estimation inside the conversion formula calculation unit 4 will be described. As an example, a conversion equation is estimated and calculated by the following equation for the interrelationship of the pattern area ratio data, the ink origin roller rotation amount data, the ink key opening data, the printing speed data, the ink origin roller surface temperature data, and the paper quality data.

[0018] ^{G = C0 · A a · N} b · T c · P d · V e ·············· C0, a, b, c, d, e: constant G: Ink key opening A: Design area ratio N: Ink source roller rotation amount T: Ink source roller surface temperature P: Paper quality V: Printing speed It is assumed that the number m of pattern data stored in the past data update / storage device 3 is 50.

Procedure for estimating conversion formula (a) The logarithm of the image area ratio data, the ink source roller rotation amount, the ink key opening data, the ink source roller surface temperature, the paper quality, and the printing speed are taken. G '= L0G (G), A' = L0G (A), N '= L0G (N), T' = L0G (T), P '= L0G (P), V' = L0G (V) ... (B) Arrange the data by the following formula group (formula).

G ′ _1,1 = C0 ′ + a · A ′ _1,1 + b · N ′ ₁ + c · T ′ ₁ + d · P ′ ₁ + e · V ′ ₁ G ′ _2,1 = C0 ′ + a · A ′ _2,1 + b ・ N ' ₁ + c ・ T' ₁ + d ・ P ' ₁ + e ・ V' ₁ G ' _3,1 = C 0' + a ・ A ' _3,1 + b ・ N' ₁ + c ・ T ' ₁ + d ・P ′ ₁ + e ・ V ′ ₁ ..... G'n _{, 1} = C0 '+ a-A' _{n, 1} + b-N ' ₁ + c-T' ₁ + d-P ' ₁ + e- _{V '1 G' 1,2 = C0} '+ a · A' 1,2 + b · N '2 + c · T' 2 + d · P '2 + e · V' 2 G '2,2 = C0' + a · A ' _2,2 + b ・ N ' ₂ + c ・ T' ₂ + d ・ P ' ₂ + e ・ V' ₂ ... _{······················· G 'n, 2 = C0} ' + a · A 'n, 2 + b · N' 2 + c · T '2 + d · P ′ ₂ + e · V ′ ₂・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・_{·················· G '1,50 = C0' +} a · A '1,50 + b · N' 50 + c · T '50 + d · P' 50 + e · _{V '50 G' 2,50 = C0} '+ a · A' 2,50 + b · N '50 + c · T' 50 + d · P '50 + e · V' 50 ············ ..................................................................... G ' _{n, 50 = C0 '+ a} · a' n, 50 + b · n '50 + c · T' 50 + d · P '50 + e · V' 50 , however, the index of a 'and G' 1,1~n, 50 of The first number is the in It shows the key position, and the number after it shows the pattern data number. Also, N ', T', P ', V'subscripts ₁ to ₅₀
Indicates a pattern data number, that is, a job number. G '= C0' + a * A '+ b * N' + c * T '+ d * P * + e * V' of the multiple regression model of the following equation (c) n′50) data groups, A ′, N ′,
By using T ′, P ′ and V ′ as five explanatory variables and G ′ as an objective variable, and performing multiple regression analysis on the data group of the equation, C0 ′, a, b, c, d, e Can be determined as a partial regression coefficient.

The method of multiple regression analysis is described in "Multivariate Analysis Method" by Taichi Okuno et al., Published by Nikka Giren Publishing Co., Ltd. (D) The relational expression to be obtained is as follows. ^{G = C0 · A a · N} b · T c · P d · V e ············· However, C0: ANTILOG (C0 ') transformation expression average ink source to equation N Substitute the roller rotation amount N _S ,

[0022]

[Equation 1]

It becomes an expression. In ^{G = C0 · A a · N} S b · T c · P d · V e ············ conversion formula calculating unit 4 performs calculation as described above. As described above, the preset value calculation unit 5 based on the conversion formula uses the calculated conversion formula to calculate the pattern area ratio data for the pattern to be printed, the current ink source roller surface temperature, the paper type, and the printing. The speed is separately input and substituted from the device, and preset values, that is, (G _p1 ... G _pn ) and N
_p (N _S ) is obtained. This value is sent to the ink supply amount adjusting device by the output unit 6 to the ink supply amount adjusting device, and printing is started.

After the printing is started, the operator matches the color with the sample printed matter while correcting the preset value. After the color matching is completed, the operator presses a button (not shown) so that the switches 7 and 7'contact the B side, and the set value data for which the color matching is completed immediately before, the pattern area ratio data of the relevant pattern, and the ink source at that time. The roller temperature, paper type, and printing speed data are input to the past data update / storage device 3. If the set value data at that time is not worthy of being stored for some reason, the operator does not press the previous button, and therefore the update by that data is not performed.

In the past data update / storage device 3, it is always 5
Since 0 data is stored, when new data is input, the data related to the oldest pattern is deleted,
Instead, newly input data is newly stored. That is, each time the switch 7 contacts B, the stored contents are updated. When new pattern area ratio data is input to the pattern area ratio data input section 1, the switches 7 and 7'contact A and the above operation is repeated.

[0026]

As described above, the ink supply amount presetting device of the present invention always prints past data (picture area ratio data, after the operator has performed color matching) about the printing conditions that have a great influence on the printing density. The conversion formula is updated based on the ink supply amount data, printing speed data during color matching, ink source roller temperature data, and paper quality data). It is possible to shorten the matching time and reduce waste of paper for color matching.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an ink supply amount preset device according to the present invention.

FIG. 2 is an explanatory diagram showing a relationship between a pattern area ratio, a rotation amount of an ink source roller, and an opening degree of an ink key.

FIG. 3 is an explanatory diagram showing that the ink supply amount, that is, the solid density on the paper surface changes depending on the ink source roller surface temperature even when the ink key opening and the ink source roller rotation speed are constant.

FIG. 4 is an explanatory diagram showing that the ink supply amount, that is, the solid density on the paper surface changes depending on the printing speed even when the ink key opening and the ink source roller rotation speed are constant.

FIG. 5 is an explanatory diagram showing that the ink supply amount, that is, the solid density on the paper surface changes depending on the paper quality even when the ink key opening and the ink source roller rotation speed are constant.

[Explanation of symbols]

 1 Image area ratio data input unit 2 Set value data input unit 3 Past data update / storage device 4 Conversion formula calculation unit 5 Preset value calculation unit by conversion formula 6 Output unit to ink supply amount adjustment device 7, 7'switch 8 Printing Condition data input section

Claims (1)

[Claims] 1. A pattern area ratio data input unit for receiving pattern area ratio data for each ink key in the width direction of a printed matter, that is, data of an area ratio of a portion on the printed matter to which ink should be attached, and a printing start rate start unit. A setting value data input section that receives the setting value data of the ink supply amount for each ink key after color matching by the operator, and printing condition data that receives printing condition data such as printing speed, paper quality, ink source roller temperature during color matching An input unit, and a past data update / storage device that stores while constantly updating the data of each of the input units for a past fixed number of print patterns from the present time,
Approximate expression for obtaining the set value of the ink supply amount from the pattern area ratio based on the stored data, that is, the conversion formula calculation unit for calculating the conversion formula, and the conversion formula obtained by the conversion formula calculation unit By substituting the pattern area ratio for each ink key from the data input section, the printing speed at the time of color matching from the printing condition data input section, the paper quality, and the ink source roller temperature, the set value of the ink supply amount for each ink key is set. A preset value calculation unit based on a conversion formula for calculation and an output unit to the ink supply amount adjustment device that receives the set value obtained by the preset value calculation unit and outputs the set value to the ink supply amount adjustment device as a preset value. Ink supply amount presetting device characterized by