JP2006103050A - Ink supply adjusting method and device of printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink supply adjusting method and device of a printing machine, in which the adjustment of ink supply can be finished in a short period of time and consequently the occurrence of damaged paper can be reduced. <P>SOLUTION: Every time the density value of a printed matter is measured after the adjustment of an ink supply, the correction value of the ink supply is calculated based on the density value of the measured printed matter and the density value to be at the measurement of the printed matter at its measured time so as to readjust the ink supply based on the calculated correction value. The ink supply may be readjusted based on the correction value, which is calculated based on the density value of the measured printed matter and the remaining changing amount in density to be at the measurement of this time of the printed matter at its measure time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an ink supply amount adjustment method and apparatus for a printing press that adjusts an ink supply amount to a printing plate based on a density value of a printed matter.

  FIG. 23 shows the main part of the inking device (inker) in the printing unit for each color in the 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 keys, 5 is an ink transfer roller, 6 is an ink roller group, 7 is a printing plate mounted on the plate cylinder 8, and a pattern is printed on the printing plate 7.

  In this ink device, the ink 2 in the ink fountain 1 is supplied to the ink fountain roller 3 from between the ink keys 4-1 to 4-n and the ink fountain roller 3, and the ink supplied to the ink fountain roller 3 is transferred to the ink fountain roller 3. The ink is supplied to the printing plate 7 through the ink roller group 6 by the calling operation of the roller 5. The ink supplied to the printing plate 7 is printed on printing paper through a rubber cylinder (not shown).

  FIG. 24 shows a printed matter printed by this printing machine. On the printed matter 9, a strip-shaped color bar 9-2 is printed in a blank portion excluding the pattern area 9-1. The color bar 9-2 is a patch for density measurement of black (sumi), cyan (eye), magenta (red), and yellow (ki) (solid patch with a dot area ratio of 100%) 9a1 in the case of general four-color printing. , 9a2, 9a3, 9a4, and regions S1 to Sn. The areas S1 to Sn correspond to the key zones of the ink keys 4-1 to 4-n in each color printing unit in the printing press.

[Color matching]
A reference density value is set in advance for each color printing unit. That is, reference density values are set in advance for each of the colors Sumi, Eye, Red, and Ki, and when the printed material 9 is printed, a color matching operation for matching the density value of each color with the reference density value is performed. Done. This color matching operation is based on the density of each color density measurement patch 9a (9a1, 9a2, 9a3, 9a4) in the color bar 9-2 printed on the printed matter 9, before the start of the main printing (print preparation stage) This is performed by the ink supply amount adjusting device during the main printing.

  For example, the region S1 in the printed material 9 will be described as a representative. The density value of the patch 9a for measuring the density of each color of the printed material 9 extracted before or during the main printing is measured, and the measured density value of each color. And the reference density value of each color set in advance, and the correction amount of the opening amount of the ink key 4-1 in the printing unit of each color (the amount of ink supply to the area S1) from the obtained density difference of each color A correction amount) is obtained, and the opening amount of the ink key 4-1 in each color printing unit is adjusted using the obtained correction amount as a feedback amount.

  Similarly, with respect to the areas S2 to Sn, the correction amount of the opening amount of the ink keys 4-2 to 4-n in each color printing unit (the correction amount of the ink supply amount to the areas S2 to Sn) is obtained and obtained. The opening amount of the ink keys 4-2 to 4-n in each color printing unit is adjusted using the correction amount as a feedback amount (see Patent Document 1).

Japanese Patent Laid-Open No. 2003-118077

  In the conventional ink supply amount adjustment method described above, since the ink conveyance path in the inker (conveyance path from the ink fountain roller to the rubber cylinder) is long, when adjusting the ink supply amount to the printed matter, the adjustment result of the ink supply amount Is reflected in the actual printed matter, and it is necessary to print 150 to 250 printed matter after the ink supply amount is adjusted until the ink supplied to the printed matter is stabilized.

  For this reason, conventionally, after adjusting the ink supply amount, after printing 150 to 250 printed materials, the printed product is inspected, and if it is necessary to adjust the ink supply amount, the ink supply amount The process of re-adjusting and printing 150 to 250 printed materials again is repeated many times until a normal printed material is obtained, and it takes a long time to complete the adjustment of the ink supply amount. At the same time, there was a problem that a large amount of waste paper was generated.

  In addition, after adjusting the ink supply amount, the printed matter is inspected before the supplied ink supply amount is stabilized, and the ink supply amount is adjusted again. When the ink supply is stable, the density of the printed matter becomes too thick or too thin, causing hunting phenomenon, which takes more time and often causes more paper loss. There was a problem that there was.

  The present invention has been made to solve such problems, and the object of the present invention is to provide a printing machine that can complete the adjustment of the ink supply amount in a short time and reduce the occurrence of waste paper. An object of the present invention is to provide an ink supply amount adjusting method and apparatus.

  In order to achieve such an object, the present invention measures the density value of a printed matter, obtains a density difference between the measured density value and a preset reference density value, and based on the obtained density difference. In the method of adjusting the ink supply amount of a printing press that adjusts the ink supply amount to the printing plate, the process of counting the number of printed sheets and the density value of the printed matter are measured at a desired time after adjusting the ink supply amount to the printing plate A correction value for the amount of ink supplied to the printing plate is obtained based on the process to be performed, the density value of the printed matter measured at a desired time and the count value of the number of printed sheets at that time, and the printing plate is obtained based on the obtained correction value. And a step of re-adjusting the ink supply amount. In addition, this invention can also be comprised as an apparatus to which this method is applied.

  According to the present invention, when the density value of the printed matter is measured after the ink supply amount is adjusted and before the supplied ink supply amount is stabilized, the density value of the printed matter and the count value of the number of printed sheets at that time are measured. Thus, a correction value of the ink supply amount is obtained, and the ink supply amount is readjusted based on the correction value.

  For example, the density value of the printed material is now measured (first measurement), the density difference between the measured density value and a preset reference density value is obtained, and the ink supply amount is calculated based on the obtained density difference. Is adjusted (first adjustment). After adjusting the ink supply amount for the first time, if the density value of the printed matter is measured before the supplied ink supply amount is stabilized (second measurement), the measured density value of the printed matter and the number of printed sheets at that time are counted. The ink supply amount correction value is calculated based on the value (the number of printed sheets from the previous ink supply amount adjustment to the current print density value measurement), and the ink supply amount is readjusted based on this correction value. (Second adjustment).

  Similarly, after adjusting the ink supply amount for the second time and measuring the density value of the printed matter before the supplied ink supply amount is stabilized (the third measurement), the measured density value of the printed matter and the printing at that time are measured. The correction value of the ink supply amount is obtained based on the count value of the number of sheets (the number of printed sheets from the previous adjustment of the ink supply amount to the measurement of the density value of the current printed matter), and the ink supply amount based on the correction value Is readjusted (the third adjustment).

  Thus, in the present invention, after adjusting the ink supply amount, every time the density value of the printed matter is measured, the correction value of the ink supply amount is determined based on the measured density value of the printed matter and the count value of the number of printed sheets at that time. And the ink supply amount is readjusted based on this correction value.

  In the present invention, when the ink supply amount is readjusted, a correction value of the ink supply amount is obtained based on the density value of the printed matter measured this time and the count value of the number of printed sheets at that time. Based on the count value, the density value that should be at the current measurement of the printed material is estimated, and the corrected value of the ink supply amount is calculated based on the estimated density value of the printed material at the current measurement time and the density value of the printed material that has been measured this time. The desired method can be considered. In this method, if the estimated density value of the printed material at this time is yn, this density value yn can be expressed by the following equation (1).

  In equation (1), x represents the number of printed sheets, y represents a density value, yt represents a target density value, n represents a current measurement number value, k represents 1 ≦ k ≦ n, and xnm <(xk + xs). Satisfactory minimum number of measurements, xnm is the number of printed sheets at the time of measurement, xs is the number of printed sheets required until the ink supply is stabilized, yim is the density value when the density value is measured for the i-th time, and α is Density value variation coefficient with respect to ink key opening amount, Ki is a correction value for the i-th ink key opening amount, f (x) is a density value change function (0 to 1) relating to the number of printed sheets, and xi is an i-th ink key opening amount. The number of printed sheets, yi, when the adjustment is made, indicates the density value that should be in the i-th density measurement estimated when the ink key opening amount is adjusted for the (i-1) th time.

  In the present invention, when the ink supply amount is readjusted, a correction value of the ink supply amount is obtained based on the density value of the printed matter measured this time and the count value of the number of printed sheets at that time. Based on the count value, the remaining density change amount that should be at the current measurement of the printed matter is estimated, and the ink density is determined based on the estimated remaining density change amount at the current measurement of the printed matter and the currently measured density value of the printed matter. A method for obtaining a correction value of the supply amount can be considered. In this method, if the remaining density change amount that should be estimated at this time of the printed material is yn ', this density change amount yn' can be expressed by the following equation (2).

  However, in the formula (2), x represents the number of printed sheets, y represents the density value, n represents the current measurement number value, k represents the minimum measurement number value satisfying xnm <(xk + xs) with 1 ≦ k ≦ n, xnm is the number of printed sheets at the time of this measurement, xs is the number of printed sheets required until the ink supply amount is stabilized, yim is the density value when the density value is measured for the i-th time, and α is the change in the density value with respect to the ink key opening amount. A quantity coefficient, Ki is a correction value of the i-th ink key opening amount, f (x) is a density value change function (0 to 1) relating to the number of printed sheets, and xi is the number of printed sheets when the ink key opening amount is adjusted for the i-th time. , Yi indicates a density value that should be present at the i-th density measurement estimated when the ink key opening amount is adjusted for the (i-1) th time.

  According to the present invention, after adjusting the ink supply amount, every time the density value of the printed matter is measured, a corrected value of the ink supply amount is obtained based on the measured density value of the printed matter and the count value of the number of printed sheets at that time. Based on this correction value, the ink supply amount is readjusted, and the appropriate ink supply amount is readjusted taking into account the density value that should be present and the remaining density change that should be present. In this way, the adjustment of the ink supply amount can be completed in a short time, and the generation of waste paper can be reduced.

Hereinafter, the present invention will be described in detail based on the drawings.
〔principle〕
[Number of printed sheets-Ink density characteristic curve]
FIG. 1A illustrates a characteristic curve of the number of printed sheets and ink density (number of printed sheets-ink density characteristic curve) with respect to the change amount K (%) of the ink key opening amount. In FIG. 1A, the horizontal axis represents the number of printed sheets x, the vertical axis represents the density value y, x1 represents the number of printed sheets immediately before the ink key opening amount is changed by K%, and y1 represents the ink density at the number of printed sheets x1. It is assumed that the density value is stable at y1 at the time of the number x1. xe is the number of printed sheets when the final density value is reached by changing the ink key opening amount by K%, and ye is the final density value by changing the ink key opening amount by K%.

  In FIG. 1A, assuming that the variation coefficient of the density value with respect to the ink key opening amount is α and xs is the number of printed sheets (xs = xe−x1) required until the ink density is stabilized, the ink key is K (%). The relationship between the number of printed sheets x and the density value y after the change, that is, the number of printed sheets-ink density characteristic curve shown in FIG. 1A is expressed by y = y1 + α · K · f (x−x1). Can do. However, the range of y = f (x) is normalized from 0 to 1, and the final ink density change amount is α · K. The functions f (x) and α can be calculated from experimental data, but their values vary depending on the printer model, that is, the configuration of the inking device.

[Adjustment of ink supply using the number of printed sheets-ink density characteristic curve]
FIG. 1B is a view for explaining one method of the ink supply amount adjusting method of the printing press according to the present invention. In the figure, the horizontal axis represents the number of printed sheets x, the vertical axis represents the density value y, and yt represents the target density value (reference density value). In this example, it is assumed that the density value of the printed material is stable at y1m at time t0 when the number of printed sheets x1m. That is, it is assumed that the printed material is currently being printed, and the density value of the printed material is stable at y1m at time t0 when x1m sheets are printed.

[Measurement & Adjustment: First time]
Now, at time t0, a color matching operation for matching the density value of the printed material with the reference density value yt (= y1) is started. In this case, the x1m-th printed matter is extracted, and the density value y1m of this printed matter is measured (first measurement).

Then, from the following equation (3), a correction value K1 for the ink key opening amount is obtained as K1 = (yt−y1m) / α, and the ink key opening amount is adjusted based on the correction value K1 (first adjustment).
yt = y1m + α · K1 (3)
In the equation (3), α is a density value variation coefficient with respect to the ink key opening, and is a coefficient determined in advance for the ink key.

Here, it is assumed that the time point t0 is when the density value of the printed material is measured (during the first measurement), and the time point t1 is when the ink key opening amount correction is completed (when the first correction is completed), and the printed material is printed when the first correction is completed. When the number of sheets is x1, the relationship between the number of printed sheets after x1 and the density value, that is, the estimation formula for the density value of the printed material after x1, is expressed by the following expression (4).
y = y1m + α · K1 · f (x−x1) (4)

[Measurement & Adjustment: Second time]
Next, at time t2 before the number of printed sheets reaches x1 + xs (xs: number of printed sheets required until the ink supply amount is stabilized), that is, at time t2 before the ink supply amount is stabilized, the x2m-th sheet. The printed material is extracted (x2m <(x1 + xs)), and the density value y2m of the printed material is measured (second measurement).

Then, from the following equation (5), a correction value K2 of the ink key opening amount is obtained as K2 = (y2−y2m) / α, and the ink key opening amount is readjusted based on the correction value K2 (second adjustment). .
y2 = y2m + α · K2 (5)
In equation (5), y2 is the density value of the printed material that should be present at the time of the current measurement (second measurement), and is estimated as y2 = y1m + α · K1 · f (x2m−x1) from equation (4). Is done.

Here, it is assumed that the time point t2 is when the density value of the printed material is measured (second time measurement), and the time point t3 is when the correction of the ink key opening amount is completed (second time correction is completed), and the printed material is printed when the second correction is completed. When the number of sheets is x2, the relationship between the number of printed sheets after x2 and the density value, that is, the estimation formula for the density value of the printed material after x2, is expressed by the following expression (6).
y = yt + [y1m + α · K1 · f (x−x1) −y1] + [y2m + α · K2 · f (x−x2) −y2] (6)

The above expression (6) is an expression for reaching the target density value yt in the number of printed sheets (x2 + xs), and is derived from the following expression (7).
y = yt − [(Remaining density change amount for the first correction) + (Remaining density change amount for the second correction)] (7)

In equation (7), the remaining density change amount for the first correction is expressed as y1− (y1m + α · K1 · f (x−x1)), and the remaining density change amount for the second correction is y2−2. (Y2m + α · K2 · f (x−x2)). Therefore, equation (7) is
y = yt − [{y1− (y1m + α · K1 · f (x−x1)} + {y2− (y2m + α · K2 · f (x−x2))}) (8)
The above equation (6) is obtained by developing this equation.

[Measurement and adjustment: 3rd time]
Next, at time t4 before the number of printed sheets reaches x2 + xs, the x3m-th printed matter is extracted (x3m <(x2 + xs)), and the density value y3m of the printed matter is measured (third measurement).

Then, from the following equation (9), a correction value K3 for the ink key opening amount is obtained as K3 = (y3−y3m) / α, and the ink key opening amount is readjusted based on the correction value K3 (third adjustment). .
y3 = y3m + α · K3 (9)
In equation (9), y3 is the density value of the printed material that should be present at the time of this measurement (during the third measurement). From equation (6), y3 = yt + [y1m + α · K1 · f (x3m−x1) −y1] + [y2m + α · K2 · f (x3m−x2) −y2].

Here, when the density value of the printed material is measured (when the third measurement is performed), the time point t4 is when the correction of the ink key opening amount is completed (when the third correction is completed), and the printed material is printed when the third correction is completed. When the number of sheets is x3, the relationship between the number of printed sheets after x3 and the density value, that is, the estimation formula for the density value of the printed material after x3 is expressed by the following expression (10).
y = yt + [y1m + α · K1 · f (x−x1) −y1] + [y2m + α · K2 · f (x−x2) −y2] + [y3m + α · K3 · f (xx3) −y3]・ (10)

[Measurement & Adjustment: 4th time]
Next, at time t6 before the number of printed sheets reaches x3 + xs, the x4m-th printed matter is extracted (x4m <(x3 + xs)), and the density value y4m of the printed matter is measured (fourth measurement).

Then, from the following equation (11), a correction value K4 for the ink key opening amount is obtained as K4 = (y4−y4m) / α, and the ink key opening amount is readjusted based on the correction value K4 (fourth adjustment). .
y4 = y4m + α · K4 (11)

  In equation (11), y4 is the density value of the printed material that should be present at the time of the current measurement (during the fourth measurement). From equation (10), y4 = yt + [y1m + α · K1 · f (x3m−x1) −y1] + [y2m + α · K2 · f (x3m−x2) −y2] + [y3m + α · K3 · f (x−x3) −y3]. However, in the example of FIG. 1B, the number of printed sheets x4m at the time of the current measurement is x4m> (x1 + xs), and the remaining density change amount at the time of the current measurement with respect to the first correction is zero, so [y1m + α · The term “K1 · f (x3m−x1) −y1]” is excluded.

  In the same manner, each time the density value of the printed matter is measured, the measured density value of the printed matter and the number of printed sheets at that time (printing from the previous ink supply amount adjustment until the current density value of the printed matter is measured) A correction value of the ink key opening amount is obtained based on the density value that should be obtained at the time of the current measurement of the printed matter estimated on the basis of the number of prints), and the ink key opening amount is adjusted based on the obtained correction value. As a result, each time the density value of the printed material is measured, the appropriate ink supply amount is adjusted again taking into account the density value that should be present at the time of the current measurement. Less paper is generated.

  In this method, if the density value that should be present at the time of measurement is yn, the density value yn is expressed by the following equation (12).

  In equation (12), yt is the target concentration value, n is the current measurement value, k is the minimum measurement value that satisfies 1 ≦ k ≦ n and xnm <(xk + xs), and xnm is the current measurement value. Xs is the number of printed sheets required until the ink supply is stabilized, yim is the density value when the density value is measured for the i-th time, α is the coefficient of change in density value relative to the ink key opening amount, Ki Is the correction value for the i-th ink key opening amount, f (x) is a density value change function (0 to 1) relating to the number of printed sheets, xi is the number of printed sheets when the ink key opening amount is adjusted for the i-th time, and yi is ( i-1) Indicates a density value that should be present at the i-th density measurement estimated when the ink key opening amount is adjusted for the first time.

  In the above-described method, the density value that should be at the current measurement of the printed material is estimated, and the ink key opening amount is corrected based on the estimated density value at the current measurement of the printed material and the density value of the printed material that has been measured this time. The remaining density change amount that should be present at the time of the current measurement of the printed matter is estimated, and the estimated remaining amount change amount of the printed matter at the current measurement time and the density value of the printed matter that has been measured this time are estimated. Thus, the correction value of the ink key opening amount may be obtained. In this case, if the remaining density change amount that should be estimated at the current measurement is yn ', this density change amount yn' can be expressed by the following equation (13).

  However, in the equation (13), n is the current measurement number value, k is the minimum measurement number value satisfying xnm <(xk + xs) with 1 ≦ k ≦ n, xnm is the number of printed sheets at the current measurement, and xs is the ink. The number of printed sheets required until the supply amount is stabilized, yim is the density value when the density value is measured at the i-th time, α is the coefficient of change in density value relative to the ink key opening amount, and Ki is the ink key opening amount at the i-th time. The correction value, f (x) is a density value change function (0 to 1) regarding the number of printed sheets, xi is the number of printed sheets when the ink key opening amount is adjusted for the i-th time, and yi is the ink key opened for the (i-1) -th time. The density value which should be at the time of the i-th density | concentration measurement estimated when the quantity is adjusted is shown.

[Embodiment 1: Example based on concentration value to be present at the time of measurement (method 1)]
FIG. 2 is a block diagram of a density measurement and ink supply amount adjusting device (hereinafter simply referred to as an ink supply amount adjusting device) showing an embodiment of the present invention. The ink supply amount adjusting device 10 includes a CPU 10A, a RAM 10B, a ROM 10C, an input device 10D, a display 10E, an output device 10F, input / output interfaces (I / O, I / F) 10G to 10K, a colorimeter 10L, and a colorimeter. A meter moving motor 10M, a rotary encoder 10N, a motor driver 10P, a counter 10Q, an A / D converter 10R, a D / A converter 10S, a colorimeter origin position detector 10T, and memories M1 to M22 are provided.

  The CPU 10A obtains various input information given through the interfaces 10G to 10K, and operates according to a program stored in the ROM 10C while accessing the RAM 10B and the memories M1 to M22. The input device 10D is provided with a measurement start switch SW1, a control end switch SW2, and the like. The rotary encoder 10N generates a rotation pulse at every predetermined number of rotations (angle) of the colorimeter moving motor 10M and outputs the rotation pulse to the counter 10Q.

  In FIG. 2, 11 (11-1 to 11-n) is an ink key control device provided for each of the ink keys 4 (4-1 to 4-n) of each color shown in FIG. . By these ink key control devices 11-1 to 11-n, the opening amounts of the ink keys 4-1 to 4-n with respect to the ink fountain roller 3 are adjusted to individual pieces. As shown in FIG. 3, the ink key control device 11 includes an ink key drive motor driver 11A, an ink key drive motor 11B, a rotary encoder 11C, a counter 11D, a CPU 11E, a ROM 11F, a RAM 11G, and memories 11H to 11K. And interfaces (I / O, I / F) 11L and 11M, which are connected to the ink supply amount adjusting device 10 via the interface 11L. The rotary encoder 11C generates a rotation pulse at every predetermined number of rotations (angle) of the ink key drive motor 11B and outputs it to the counter 11D.

  In FIG. 2, reference numeral 12 denotes a printing press control device. As shown in FIG. 4, the printing press control device 12 receives a pulse signal from the printing press 1 rotation detector 12A that generates a pulse signal for each rotation of the printing press and the printing press 1 rotation detector 12A. A printed sheet counter 12B that counts the number of printed sheets, a flip-flop 12C, a CPU 12D, a ROM 12E, a RAM 12F, a memory 12G that stores a count value of the printed sheet counter 12B, and an interface (I / O, I / F) 12H and 12I, and is connected to the ink supply amount adjusting device 10 via the interface 12H. In response to the instruction from the CPU 12D, the flip-flop 12C notifies the printing number counter 12B of the timing of printing start (count start) and print stop (count end).

  In FIG. 2, the memory M1 stores the number of printed sheets at the time of past correction completion. The memory M2 stores a correction amount of the opening amount of each ink key at the time of past correction. In the memory M3, the measured density value of each patch of each color at the time of past correction is stored. The memory M4 stores the correction target density value of each patch of each color at the time of past correction. The memory M5 stores the total density change amount remaining for each patch of each color that should be present during the current measurement with respect to past corrections.

  The memory M6 stores a reference density value for each color of the color bar. The memory M7 stores an allowable density difference for each color of the color bar. The memory M8 stores the position of each patch of each color of the color bar to be measured by the colorimeter. The memory M9 stores the number of printed sheets at the current measurement. The memory M10 stores the value of the counter for measuring the current position of the colorimeter. The memory M11 stores the current position of the colorimeter.

  The memory M12 stores color data of each patch of each color of the color bar. The memory M13 stores the density value at the time of the current measurement of each patch of each color. The memory M14 stores the number of printed sheets from the completion of past corrections to the current measurement. The memory M15 stores the number of printed sheets until the printing density is stabilized after correction (the number of printed sheets required until the ink supply amount is stabilized). The memory M16 stores the number of printed sheets of each color-ink density characteristic curve.

  The memory M17 stores the remaining density change amount of each patch of each color that should be present during the current measurement with respect to past corrections. The memory M18 stores the density value of each color patch that should be present at the time of measurement. The memory M19 stores a density difference to be corrected for each patch of each color. The memory M20 stores the absolute value of the density difference to be corrected for each patch of each color. The memory M21 stores a correction amount conversion table of density difference-ink key opening amount of each patch of each color. The memory M22 stores a correction amount for each ink key opening amount.

As shown in FIG. 5, the colorimeter 10L is attached to a ball screw (feed screw) 13-3 provided between the columns 13-1 and 13-2. The ball screw 13-3 is rotated forward / reversely by the calorimeter moving motor 10M. By the forward / reverse rotation of the ball screw 13-3, the colorimeter 10L moves between the columns 13-1 and 13-2 while being guided by the ball screw 13-3. The head portion 10L ₁ of the colorimeter 10L is directed to the surface 13-4a on which the measurement target of the measurement table 13-4 is placed.

[Color matching]
It is assumed that the printed material is currently printed and the density value of each color of the printed material is stable. From this state where the density value is stable, the color matching operation is started in order to make the density value of each color of the printed matter coincide with the reference density value. It should be noted that during this color matching operation, printing of the printed material can be continued without interruption.

  Prior to this color matching operation, the CPU 10A of the ink supply amount adjusting device 10 initializes the memories M1, M2, M3, and M4 (steps 101, 102, 103, and 104 shown in FIG. 6), and the color input by the operator. The reference density value and allowable density difference of each color of the bar are stored in the memories M6 and M7 (step 105). Further, the position of each patch of each color of the color bar input by the operator is captured (step 106), and the position of each patch of each color of the color bar to be measured by the colorimeter based on the position of each patch of each color (step 106). (Measurement position) is calculated, and the calculated measurement position is stored in the memory M8 (step 107).

[Measurement & Adjustment: First time]
The operator turns on the measurement start switch SW1 of the input device 10D and starts the color matching operation. The CPU 10A confirms that the measurement start switch SW1 is turned on (YES in step 109), sets the storage contents of the memory M5 to “0” (step 110), and then sets the number of prints to the printing press control device 12 (FIG. 4). A transmission command is sent (step 111 shown in FIG. 7).

  FIG. 13 shows a processing flow performed by the CPU 12D of the printing press control apparatus 12. When the start of printing is instructed (YES in step 204), the CPU 12D of the printing press control device 12 sends a set signal to the flip-flop 12C (step 205), and starts the counting operation in the printed sheet counter 12B. When printing stop is instructed (YES in step 206), a reset signal is sent to the flip-flop 12C (step 207), and the counting operation in the printed sheet counter 12B is stopped. When a print number transmission command is sent from the ink supply amount adjusting device 10 (YES in step 201), the count value of the print number counter 12B at that time is read (step 202), and the count of the read print number counter 12B is read. The value, that is, the current number of printed sheets is transmitted to the ink supply amount adjusting apparatus 10 (step 203).

  The CPU 10A of the ink supply amount adjusting apparatus 10 receives the number of printed sheets from the printing press control apparatus 12 (YES in step 112), and stores the received number of printed sheets as the number of printed sheets x1m at the time of the current measurement (first time). Store in M9 (step 113).

On the other hand, the operator sets the x1m-th printed matter printed by the printing machine as a measurement target and sets it on the measurement table 13-4 (FIG. 5). In this set state, the color bar 9-2 printed on the printed material 9 is located on the lower surface of the head portion 10L ₁ of the colorimeter 10L.

  In the set state of the x1m-th printed matter 9, the CPU 10A sends a normal rotation command to the motor driver 10P to cause the colorimeter moving motor 10M to perform normal rotation (step 114). The ball screw 13-3 rotates forward by the normal rotation of the colorimeter moving motor 10M, and is guided by the ball screw 13-3 so that the calorimeter 10L contacts the column 13-1 toward the column 13-2. Move.

  The CPU 10A reads the count value of the calorimeter current position measuring counter 10Q and stores the read count value in the memory M10 (step 115). Further, the current position of the colorimeter 10L is calculated from the read count value of the current colorimeter current position measurement counter 10Q and stored in the memory M11 (step 116). When the colorimeter 10L reaches the first measurement position stored in the memory M8 (YES in step 117), color data of the patch 9a positioned at the measurement position is collected by the colorimeter 10L. The collected color data is stored in the memory M12 (steps 118 and 119).

  Similarly, every time the CPU 10A reaches the measurement position stored in the memory M8, the color data of the patch 9a located at the measurement position is collected by the colorimeter 10L, and the collected color data is stored in the memory M12. Store it. That is, the CPU 10A sequentially collects color data of each patch of each color of the color bar printed on the x1m-th printed matter by automatically scanning the colorimeter 10L.

  The CPU 10A determines whether or not the color data collection of all the patches of the color bar printed on the x1m-th printed matter has been completed (step 120). Is stopped (step 121). Next, the colorimeter moving motor 10M is reversely rotated (step 122), the colorimeter 10L is returned to the origin position (YES in step 123), and the reverse rotation of the colorimeter moving motor 10L is stopped (step 123). Step 124).

  Then, the density value of each patch of each color is calculated from the color data of each patch of each color stored in the memory M12, and stored in the memory M13 as the density value at the time of the current measurement (first time) (step 125). In the present embodiment, a spectrometer is used as the colorimeter 10L, and the transmittance of each wavelength of the filter used when measuring the solid patch of each color with the densitometer is multiplied by the output value of each wavelength from the spectrometer. By summing them, the density value of each color is obtained.

  Next, the CPU 10A reads from the memory M1 the number of printed pages at the time of past correction completion (step 126 shown in FIG. 8). In this case, the memory M1 has been initialized in the previous step 101, and there is no data in the memory M1. Therefore, the CPU 10A proceeds to step 167 in FIG. 11 in response to YES in step 127, and reads the reference density value of each color from the memory M6.

  Then, the current density value of each patch of each color is read from the memory M13 (step 168), and the current density value of each patch of each color is subtracted from the reference density value of each color to correct each patch of each color. The density difference to be obtained is obtained and stored in the memory M19 (step 169). Further, the absolute value of the density difference to be corrected for each patch of each color is obtained and stored in the memory M20 (step 170).

  Next, the CPU 10A reads the allowable density difference of each color from the memory M7 (step 171). Then, the absolute value of the density difference to be corrected for each patch of each color is compared with the allowable density difference of each color (step 172), and the patch whose density difference to be corrected is smaller than the allowable density difference (YES in step 172). ) After setting the density difference to be corrected for each patch of each corresponding color in the memory M19 to zero (step 173), the process proceeds to step 174.

  In step 174, the CPU 10 </ b> A reads a correction amount conversion table for the density difference of each color patch-ink key opening amount from the memory M <b> 21. Then, using the read density difference-ink key opening amount correction amount conversion table for each color, the corresponding ink key opening amount is calculated based on the density difference to be corrected for each color patch stored in the memory M19. Is obtained and stored in the memory M22 (step 175). Further, the obtained correction amount of the opening amount of each ink key is transmitted to each ink key control device 11 (FIG. 3) (step 176).

  When each ink key control device 11 receives the correction amount of the ink key opening amount from the ink supply amount adjusting device 10 (YES in step 301 shown in FIG. 14), the received correction amount is stored in the memory 11K (step 1). 302) The count value of the counter 11D is read (step 303), and the current ink key opening amount is obtained from the read count value of the counter 11D (step 304). Then, a target ink key opening amount is obtained from the correction amount of the ink key opening amount and the current ink key opening amount (step 305).

  If the target ink key opening amount is the same as the current ink key opening amount (YES in step 306), the process immediately proceeds to step 312 to output an ink key opening amount correction completion signal to the ink supply amount adjusting device 10. .

  If the target ink key opening amount is not the same as the current ink key opening amount (NO in step 306), the ink key driving is performed until the target ink key opening amount and the current ink key opening amount are the same. After driving the motor 11B (steps 307 to 311), an ink key opening amount correction completion signal is output to the ink supply amount adjusting device 10 (step 312).

  When the CPU 10A of the ink supply amount adjusting device 10 receives a correction completion signal for the ink key opening amount from all the ink key control devices 11 (YES in step 177 shown in FIG. 11), the CPU 10A transmits the number of prints to the printing press control device 12. A command is sent (step 178 shown in FIG. 12). In response to this transmission command, when the printing machine control device 12 transmits the number of printed sheets x1 at that time (YES in step 179), the number of printed sheets x1 is set to the memory M1 as the number of printed sheets when the first correction is completed. (Step 180).

  Also, the correction amount of each ink key opening amount is read from the memory M22 (step 181), and the read correction amount of each ink key opening amount is written in the memory M2 as the correction amount of the ink key opening amount at the first correction. (Step 182). Further, the density value at the time of current measurement of each patch of each color is read from the memory M13 (step 183), and the density value at the time of current measurement of each patch of each color thus read is measured for each patch of each color at the time of the first correction. The density value is written in the memory M3 (step 184).

  Further, the density value at the time of the current measurement of each patch of each color is read from the memory M13 (step 185), the density difference to be corrected for each patch of each color is read from the memory M19 (step 186), and the current measurement of each patch of each color is performed. The density difference to be corrected for each color patch is added to the current density value to obtain the correction target density value for each color patch for the current correction (step 187), and the correction target for each color patch for the current correction. The density value is written in the memory M4 as the correction target density value of each patch of each color at the time of the first correction (step 188).

[Measurement & Adjustment: Second time]
The operator turns on the measurement start switch SW1 again after a while after the first correction of the ink key opening amount, that is, after the first adjustment of the ink supply amount. The CPU 10A confirms that the measurement start switch SW1 is turned on (FIG. 6: YES in step 109), sets the storage content of the memory M5 to “0” (step 110), and transmits the number of prints to the printing press control device 12. A command is sent (FIG. 7: Step 111). The printing press control device 12 receives a print number transmission command from the ink supply amount adjustment device 10 and transmits the print number x2m of the printed matter at that time to the ink supply amount adjustment device 10.

  The CPU 10A receives the number of printed sheets x2m from the printing press control device 12 (YES in step 112), and stores the received number of printed sheets x2m in the memory M9 as the number of printed sheets at the time of this measurement (second time) (step). 113). The operator sets the x2m-th printed matter as a measurement target and sets it on the colorimeter 10L.

  The CPU 10A collects color data of patches of each color of the color bar printed on the x2m-th printed matter by automatically scanning the colorimeter 10L (steps 114 to 124). Then, the density value of each patch of each color is calculated from the collected color data of each patch of each color, and is stored in the memory M13 as the density value at the time of the current measurement (second time) (step 125).

  Next, the CPU 10A reads from the memory M1 the number of printed pages at the time of past correction completion (FIG. 8: step 126). In this case, the memory M1 stores the number of printed sheets x1 at the completion of the first correction as the number of printed sheets at the completion of the past correction. For this reason, the CPU 10A proceeds to step 128 in response to NO in step 127, and reads the number of printed sheets x2m at the current measurement from the memory M9.

  Then, the number of printed sheets x1 at the completion of the first correction is read from the memory M1 (step 129), and the number of printed sheets x1 at the completion of the first correction is subtracted from the number of printed sheets x2m at the current measurement. The number of printed sheets “x2m−x1” up to the current measurement is obtained and stored in the memory M14 (step 130). Then, the number of printed sheets xs required until the ink supply amount is stabilized is read from the memory M15 (step 131), and the number of printed sheets “x2m−x1” from the completion of the first correction to the current measurement is compared with xs. (FIG. 9: Step 132).

  Here, if “x2m−x1” is smaller than xs (YES in step 132), that is, if the number of printed sheets x2m at the current measurement does not reach x1 + xs (x2m <(x1 + xs)), the first time from the memory M2 The correction amount of the opening amount of each ink key at the time of correction is read (step 133), the measured density value of each patch of each color at the time of the first correction is read from the memory M3 (step 134), and at the time of the first correction from the memory M4 The correction target value of each patch of each color is read (step 135), and the number of printed sheets-ink density characteristic curve of each color is read from the memory M16 (step 136).

  Then, using the number of printed sheets of each color-ink density characteristic curve, the number of printed sheets "x2m-x1" from the completion of the first correction to the current measurement, the correction amount of the opening amount of each ink key at the first correction, From the measured density value of each color patch at the time of the first correction and the correction target value of each color patch at the time of the first correction, the remaining density change of each patch of each color that should be at the time of the current measurement with respect to the first correction The amount is calculated and stored in the memory M17 (step 137). Then, in the memory M5, the remaining density change amount of each patch of each color that should be present measurement for the first correction obtained in step 137 is stored in the memory M5, and the remaining density of each patch of each color that should be present measurement for the past correction. The total amount of change is written (step 138).

  Next, the CPU 10A confirms that, in addition to x1, the number of prints at the time of completion of past correction is not stored in the memory M1 (YES in step 144), the process proceeds to step 162 shown in FIG. Read the reference density value. Further, the total value of the remaining density change amount of each patch of each color that should be presently measured for the past correction is read from the memory M5 (step 163). Then, subtract the total density change amount of each patch of each color that should be at the current measurement from the reference density value of each color to obtain the density value of each patch of each color that should be at the current measurement. Is stored in the memory M18 (step 164).

  Then, the density value at the time of the current measurement of each patch of each color is read from the memory M13 (step 165), and each color of each color read out at step 165 is obtained from the density value of each patch of each color that should be at the current measurement obtained at step 164. The density value at the current measurement of the patch is subtracted to obtain a density difference to be corrected for each color patch, and this is stored in the memory M19 (step 166).

  Thereafter, similarly to the first time, steps 170 to 176 are executed, and the opening amount of each ink key is corrected. When receiving a correction completion signal for the ink key opening amount from all the ink key control devices 11 (YES in step 177), the CPU 10A sends a print number transmission command to the printing press control device 12 (FIG. 12: step 178). In response to this transmission command, when the printing machine control device 12 transmits the number of printed sheets x2 at that time (YES in step 179), the number of printed sheets x2 is stored in the memory M1 as the number of printed sheets when the second correction is completed. (Step 180).

  Also, the correction amount of each ink key opening amount is read from the memory M22 (step 181), and the read correction amount of each ink key opening amount is written in the memory M2 as the correction amount of the ink key opening amount at the second correction. (Step 182). Further, the density value at the time of the current measurement of each patch of each color is read from the memory M13 (step 183), and the density value at the time of the current measurement of each patch of each read color is measured for each patch of each color at the time of the second correction. The density value is written in the memory M3 (step 184).

  Further, the density value at the time of the current measurement of each patch of each color is read from the memory M13 (step 185), the density difference to be corrected for each patch of each color is read from the memory M19 (step 186), and the current measurement of each patch of each color is performed. The density difference to be corrected for each color patch is added to the current density value to obtain the correction target density value for each color patch for the current correction (step 187), and the correction target for each color patch for the current correction. The density value is written in the memory M4 as the correction target density value of each patch of each color at the time of the second correction (step 188).

[Measurement and adjustment: 3rd time]
The operator turns on the measurement start switch SW1 again after a while after the adjustment of the second ink supply amount described above. The CPU 10A confirms that the measurement start switch SW1 is turned on (FIG. 6: YES in step 109), sets the storage content of the memory M5 to “0” (step 110), and transmits the number of prints to the printing press control device 12. A command is sent (FIG. 7: Step 111). The printing press control device 12 receives a print number transmission command from the ink supply amount adjustment device 10, and transmits the print number x3m of the printed matter at that time to the ink supply amount adjustment device 10.

  The CPU 10A receives the number of printed sheets x3m from the printing press control device 12 (YES in step 112), and stores the received number of printed sheets x3m in the memory M9 as the number of printed sheets at the time of the current measurement (third time) (step). 113). The operator sets the x3m-th printed matter as a measurement target and sets it on the colorimeter 10L.

  The CPU 10A collects color data of patches of each color of the color bar printed on the x3m-th printed matter by automatically scanning the colorimeter 10L (steps 114 to 124). Then, the density value of each patch of each color is calculated from the collected color data of each patch of each color, and is stored in the memory M13 as the density value at the time of the current measurement (third time) (step 125).

  Next, the CPU 10A reads from the memory M1 the number of printed pages at the time of past correction completion (FIG. 8: step 126). In this case, the memory M1 stores the number of printed sheets x1 at the completion of the first correction and the number of printed sheets x2 at the completion of the second correction as the number of printed sheets at the completion of the past correction. Therefore, the CPU 10A proceeds to step 128 in response to NO in step 127, and reads the number of printed sheets x3m at the current measurement from the memory M9.

  Then, the number of printed sheets x1 at the completion of the first correction is read from the memory M1 (step 129), and the number of printed sheets x1 at the completion of the first correction is subtracted from the number of printed sheets x3m at the current measurement. The number of printed sheets “x3m−x1” from the current measurement to the current measurement is obtained and stored in the memory M14 (step 130). Then, the number of printed sheets xs required until the ink supply amount is stabilized is read from the memory M15 (step 131), and the number of printed sheets “x3m−x1” from the completion of the first correction to the current measurement is compared with xs. (FIG. 9: Step 132).

  If “x3m−x1” is smaller than xs (YES in step 132), the correction amount of each ink key opening amount at the time of the first correction is read from the memory M2 (step 133), and the first time from the memory M3. The measured density value of each patch of each color at the time of correction is read (step 134), the correction target value of each patch of each color at the time of the first correction is read from the memory M4 (step 135), and the number of prints of each color from the memory M16 Read the ink density characteristic curve (step 136).

  Then, using the number of printed sheets of each color-ink density characteristic curve, the number of printed sheets "x3m-x1" from the completion of the first correction to the current measurement, the correction amount of the opening amount of each ink key at the first correction, From the measured density value of each color patch at the time of the first correction and the correction target value of each color patch at the time of the first correction, the remaining density change of each patch of each color that should be at the time of the current measurement with respect to the first correction The amount is calculated and stored in the memory M17 (step 137). Further, the remaining density change amount of each patch of each color that should be present measurement for the first correction obtained in step 137 is stored in the memory M5, and the remaining density of each patch of each color that should be present measurement for the past correction is stored. The total amount of change is written (step 138).

  Next, the CPU 10A checks whether or not the memory M1 has the number of printed sheets at the time of past correction completion in addition to x1 (step 144). In this case, x2 is left in the memory M1 as the number of printed sheets when past corrections are completed. Therefore, the CPU 10A proceeds to step 145 shown in FIG. 10 in response to NO in step 144, and reads the number of printed sheets x3m at the current measurement from the memory M9. Further, the number of printed sheets at the completion of the next past correction, that is, the remaining number of printed sheets x2 at the completion of the second correction is read from the memory M1 (step 146).

  Then, the number of printed sheets x2 at the completion of the second correction is subtracted from the number of printed sheets x3m at the current measurement to obtain the number of printed sheets “x3m−x2” from the completion of the second modification to the current measurement, and stored in the memory M14. (Step 147). Then, the number of printed sheets xs required until the ink supply amount is stabilized is read from the memory M15 (step 148), and the number of printed sheets “x3m−x2” from the completion of the second correction to the current measurement is compared with xs. (Step 149).

  If “x3m−x2” is smaller than xs (YES in step 149), the correction amount of the opening amount of each ink key at the time of the second correction is read from the memory M2 (step 150), and the second time from the memory M3. The measured density value of each patch of each color at the time of correction is read (step 151), the correction target value of each patch of each color at the time of the second correction is read from the memory M4 (step 152), and the number of prints of each color from the memory M16 Read out the ink density characteristic curve (step 153).

  Then, using the number of printed sheets of each color-ink density characteristic curve, the number of printed sheets “x3m−x2” from the completion of the second correction to the current measurement, the correction amount of the opening amount of each ink key at the second correction, From the measured density value of each patch of each color at the time of the second correction and the target correction value of each patch of each color at the time of the second correction, the remaining density change of each patch of each color that should be at the time of the current measurement with respect to the second correction The amount is calculated and stored in the memory M17 (step 154).

  Then, the total density change amount of each patch of each color that should be present measurement with respect to the past correction is read from the memory M5, that is, the remaining density of each patch of each color that should be present measurement with respect to the first correction. The amount of change is read out (step 155), and the remaining density change of each patch of each color that should be present during the current measurement with respect to the first correction is changed to the remaining density change of each patch that should be present during the current measurement with respect to the second correction. The amount is added, and this is written in the memory M5 as the total value of the remaining density change amount of each patch of each color that should be presently measured with respect to a new past correction (step 156).

  Next, the CPU 10A confirms that, in addition to x1 and x2, the number of prints at the time of completion of past correction is not stored in the memory M1 (YES in step 161), and the process proceeds to step 162 shown in FIG. The reference density value of each color is read out. Further, the total value of the remaining density change amount of each patch of each color that should be presently measured for the past correction is read from the memory M5 (step 163). Then, subtract the total density change amount of each patch of each color that should be at the current measurement from the reference density value of each color to obtain the density value of each patch of each color that should be at the current measurement. Is stored in the memory M18 (step 164).

  Then, the density value at the time of the current measurement of each patch of each color is read from the memory M13 (step 165), and each color of each color read out at step 165 is obtained from the density value of each patch of each color that should be at the current measurement obtained at step 164. The density value at the current measurement of the patch is subtracted to obtain a density difference to be corrected for each color patch, and this is stored in the memory M19 (step 166).

  Thereafter, similarly to the first time and the second time, steps 170 to 176 are executed to correct the opening amount of each ink key. When receiving a correction completion signal for the ink key opening amount from all the ink key control devices 11 (YES in step 177), the CPU 10A sends a print number transmission command to the printing press control device 12 (FIG. 12: step 178). In response to this transmission command, when the number of printed sheets x3 at that time is transmitted from the printing press control device 12 (YES in step 179), the number of printed sheets x3 is stored in the memory M1 as the number of printed sheets when the third correction is completed. (Step 180).

  Also, the correction amount of each ink key opening amount is read from the memory M22 (step 181), and the read correction amount of each ink key opening amount is written in the memory M2 as the correction amount of the ink key opening amount at the third correction. (Step 182). Also, the density value at the time of the current measurement of each patch of each color is read from the memory M13 (step 183), and the density value at the time of the current measurement of each patch of each color thus read is measured for each patch of each color at the time of the third correction. The density value is written in the memory M3 (step 184).

  Further, the density value at the time of the current measurement of each patch of each color is read from the memory M13 (step 185), the density difference to be corrected for each patch of each color is read from the memory M19 (step 186), and the current measurement of each patch of each color is performed. The density difference to be corrected for each color patch is added to the current density value to obtain the correction target density value for each color patch for the current correction (step 187), and the correction target for each color patch for the current correction. The density value is written in the memory M4 as the correction target density value of each patch of each color at the time of the third correction (step 188).

  In step 132 (FIG. 9), if “x3m−x1” is larger than xs, that is, if the number of printed sheets x3m at the current measurement exceeds x1 + xs (x3m ≧ (x1 + xs)), the first time from the memory M1. Is deleted (step 140), the amount of opening of each ink key at the time of the first correction is deleted from the memory M2 (step 141), and the value at the time of the first correction is deleted from the memory M3. The measured density value of each patch of each color is deleted (step 142), and the correction target density value of each patch of each color at the time of the first correction is deleted from the memory M4 (step 143).

  In step 149 (FIG. 10), if “x3m−x2” is larger than xs, that is, if the number of printed sheets x3m at the current measurement exceeds x2 + xs (x3m ≧ (x2 + xs)), the second time from the memory M1. Is deleted (step 157), the correction amount of each ink key opening amount at the time of the second correction is deleted from the memory M2 (step 158), and the second correction time is corrected from the memory M3. The measured density value of each patch of each color is deleted (step 159), and the correction target density value of each patch of each color at the time of the second correction is deleted from the memory M4 (step 160).

  Thereafter, the measurement of the density value and the adjustment of the ink supply amount are repeated in the same manner. Here, the total value of the remaining density change amounts of the patches of the respective colors that should be in the current measurement with respect to the past correction obtained in step 156 (FIG. 10) corresponds to yn ′ represented by the equation (13). . The density value of each patch of each color that should be present at the time of the current measurement obtained in step 164 corresponds to yn represented by the above equation (12). Further, the reference density value of each color of the color bar corresponds to yt in the equation (12).

[Embodiment 2: Example based on remaining amount of change in density that should be present during measurement (method 2)]
FIG. 15 is a block diagram of a density measurement and ink supply amount adjusting device (hereinafter simply referred to as an ink supply amount adjusting device) showing another embodiment of the present invention. In this ink supply amount adjusting device 10 ′, in place of the memories M3 and M4 in the ink supply amount adjusting device 10 of the first embodiment, a memory M23 for storing a density difference to be corrected for each patch of each color at the time of past correction. And a memory M24 for storing the difference between the density value of each patch of each color and the reference density value of each color.

[Color matching]
It is assumed that the printed material is currently being printed and the density value of each color of the printed material is stable. From this state where the density value is stable, the color matching operation is started in order to make the density value of each color of the printed matter coincide with the reference density value. During this color matching operation, the printing of the printed material is continued without interruption.

  Prior to this color matching operation, the CPU 10A of the ink supply amount adjusting device 10 ′ initializes the memories M1, M2, and M23 (steps 101, 102, and 189 shown in FIG. 16), and each color of the color bar input by the operator. Are stored in the memories M6 and M7 (step 105). Further, the position of each patch of each color of the color bar input by the operator is captured (step 106), and the position of each patch of each color of the color bar to be measured by the colorimeter based on the position of each patch of each color (step 106). (Measurement position) is calculated, and the calculated measurement position is stored in the memory M8 (step 107).

[Measurement & Adjustment: First time]
The operator turns on the measurement start switch SW1 of the input device 10D and starts the color matching operation. The CPU 10A confirms that the measurement start switch SW1 is turned on (YES in step 109), sets the storage content of the memory M5 to “0” (step 110), and sends a print number transmission command to the printing press control device 12. (FIG. 17: Step 111). The printing press control device 12 receives a print number transmission command from the ink supply amount adjustment device 10 and transmits the print number x1m of the printed matter at that time to the ink supply amount adjustment device 10.

  The CPU 10A receives the number of printed sheets x1m from the printing press control device 12 (YES in step 112), and stores the received number of printed sheets x1m in the memory M9 as the number of printed sheets at the time of the current measurement (first time) (step). 113). The operator sets the x1m-th printed matter as a measurement target and sets it on the colorimeter 10L.

  The CPU 10A collects color data of patches of each color of the color bar printed on the x1m-th printed matter by automatically scanning the colorimeter 10L (steps 114 to 124). Then, the density value of each patch of each color is calculated from the collected color data of each patch of each color, and stored in the memory M13 as the density value at the time of the current measurement (first time) (step 125). Further, the reference density value of each color is read from the memory M6 (step 189), the density value at the time of the current measurement of each patch of each color is subtracted from the reference density value of each color, and the density value of each patch of each color and the reference density of each color are subtracted. The difference from the value is obtained and stored in the memory M24 (step 190).

  Next, the CPU 10A reads from the memory M1 the number of printed pages at the time of past correction completion (FIG. 18: step 126). In this case, the memory M1 has been initialized in the previous step 101, and there is no data in the memory M1. Therefore, the CPU 10A proceeds to step 191 in FIG. 21 in response to YES in step 127, and reads the difference between the density value of each patch of each color and the reference density value of each color from the memory M24. Then, the difference between the read density value of each patch of each color and the reference density value of each color is stored in the memory M19 as a density difference to be corrected for each patch of each color (step 192). Further, the absolute value of the density difference to be corrected for each patch of each color is obtained and stored in the memory M20 (step 170).

  Next, the CPU 10A reads the allowable density difference of each color from the memory M7 (step 171). Then, the absolute value of the density difference to be corrected for each patch of each color is compared with the allowable density difference of each color (step 172), and the patch whose density difference to be corrected is smaller than the allowable density difference (YES in step 172). ) After setting the density difference to be corrected for each patch of each corresponding color in the memory M19 to zero (step 173), the process proceeds to step 174.

  In step 174, the CPU 10 </ b> A reads a correction amount conversion table for the density difference of each color patch-ink key opening amount from the memory M <b> 21. Then, using the read density difference-ink key opening amount correction amount conversion table for each color, the corresponding ink key opening amount is calculated based on the density difference to be corrected for each color patch stored in the memory M23. Is obtained and stored in the memory M22 (step 175). Further, the obtained correction amount of the opening amount of each ink key is transmitted to each ink key control device 11 (step 176).

  When a correction completion signal for the ink key opening amount is received from all the ink key control devices 11 (YES in step 177), the CPU 10A sends a print number transmission command to the printing press control device 12 (FIG. 22: step 178). In response to this transmission command, when the printing machine control device 12 transmits the number of printed sheets x1 at that time (YES in step 179), the number of printed sheets x1 is set to the memory M1 as the number of printed sheets when the first correction is completed. (Step 180).

  Also, the correction amount of each ink key opening amount is read from the memory M22 (step 181), and the read correction amount of each ink key opening amount is written in the memory M2 as the correction amount of the ink key opening amount at the first correction. (Step 182). Further, the density difference to be corrected for each color patch is read from the memory M19 (step 193), and the density difference to be corrected for each read color patch is corrected for each color patch at the time of the first correction. The density difference is written in the memory M23 (step 194).

[Measurement & Adjustment: Second time]
The operator turns on the measurement start switch SW1 again after a while after the first correction of the ink key opening amount, that is, after the first adjustment of the ink supply amount. The CPU 10A confirms that the measurement start switch SW1 is turned on (FIG. 16: YES in step 109), sets the stored contents of the memory M5 to “0” (step 110), and transmits the number of printed sheets to the printing press control device 12. A command is sent (FIG. 17: step 111). The printing press control device 12 receives a print number transmission command from the ink supply amount adjustment device 10 and transmits the print number x2m of the printed matter at that time to the ink supply amount adjustment device 10.

  The CPU 10A receives the number of printed sheets x2m from the printing press control device 12 (YES in step 112), and stores the received number of printed sheets x2m in the memory M9 as the number of printed sheets at the time of this measurement (second time) (step). 113). The operator sets the x2m-th printed matter as a measurement target and sets it on the colorimeter 10L.

  The CPU 10A collects color data of patches of each color of the color bar printed on the x2m-th printed matter by automatically scanning the colorimeter 10L (steps 114 to 124). Then, the density value of each patch of each color is calculated from the collected color data of each patch of each color, and is stored in the memory M13 as the density value at the time of the current measurement (second time) (step 125). Further, the reference density value of each color is read from the memory M6 (step 189), the density value at the time of the current measurement of each patch of each color is subtracted from the reference density value of each color, and the density value of each patch of each color and the reference density of each color are subtracted. The difference from the value is obtained and stored in the memory M24 (step 190).

  Next, the CPU 10A reads from the memory M1 the number of printed pages at the time of past correction completion (FIG. 18: step 126). In this case, the memory M1 stores the number of printed sheets x1 at the completion of the first correction as the number of printed sheets at the completion of the past correction. For this reason, the CPU 10A proceeds to step 128 in response to NO in step 127, and reads the number of printed sheets x2m at the current measurement from the memory M9.

  Then, the number of printed sheets x1 at the completion of the first correction is read from the memory M1 (step 129), and the number of printed sheets x1 at the completion of the first correction is subtracted from the number of printed sheets x2m at the current measurement. The number of printed sheets “x2m−x1” up to the current measurement is obtained and stored in the memory M14 (step 130). Then, the number of printed sheets xs required until the ink supply amount is stabilized is read from the memory M15 (step 131), and the number of printed sheets “x2m−x1” from the completion of the first correction to the current measurement is compared with xs. (FIG. 19: Step 132).

  Here, if “x2m−x1” is smaller than xs (YES in step 132), that is, if the number of printed sheets x2m at the current measurement does not reach x1 + xs (x2m <(x1 + xs)), the first time from the memory M2 The correction amount of the opening amount of each ink key at the time of correction is read (step 133), the density difference to be corrected for each patch of each color at the time of the first correction is read from the memory M23 (step 195), and the printing of each color is performed from the memory M16. The number-of-ink density characteristic curve is read (step 136).

  Then, using the number of printed sheets of each color-ink density characteristic curve, the number of printed sheets “x2m−x1” from the completion of the first correction to the current measurement, the correction amount of the opening amount of each ink key at the time of the first correction, and From the density difference to be corrected for each color patch at the time of the first correction, the remaining density change amount of each patch of each color that should be at the current measurement relative to the first correction is calculated and stored in the memory M17 (step 137). '). Then, the remaining density change amount of each patch of each color that should be present measurement for the first correction obtained in step 137 ′ is stored in the memory M5 as the remaining amount of each patch of each color that should be present measurement for the past correction. The total value of the density change amount is written (step 138).

  Next, the CPU 10A confirms that, in addition to x1, the number of prints at the time of completion of past corrections is not stored in the memory M1 (YES in step 144), the process proceeds to step 196 shown in FIG. The difference between the density value of each patch and the reference density value of each color is read. Further, the total value of the remaining density change amount of each patch of each color that should be presently measured for the past correction is read from the memory M5 (step 163). Then, the difference between the density value of each patch of each color and the reference density value of each color is subtracted from the total density change amount of each patch of each color that should be at the time of the current measurement with respect to past corrections. The density difference to be corrected is obtained and stored in the memory M19 (step 197).

  Thereafter, similarly to the first time, steps 170 to 176 are executed, and the opening amount of each ink key is corrected. When a correction completion signal for the ink key opening amount is received from all the ink key control devices 11 (YES in step 177), the CPU 10A sends a print number transmission command to the printing press control device 12 (FIG. 22: step 178). In response to this transmission command, when the printing machine control device 12 transmits the number of printed sheets x2 at that time (YES in step 179), the number of printed sheets x2 is stored in the memory M1 as the number of printed sheets when the second correction is completed. (Step 180).

  Also, the correction amount of each ink key opening amount is read from the memory M22 (step 181), and the read correction amount of each ink key opening amount is written in the memory M2 as the correction amount of the ink key opening amount at the second correction. (Step 182). Further, the density difference to be corrected for each patch of each color is read from the memory M19 (step 193), and the density difference to be corrected for each patch of each color thus read is corrected for each patch of each color at the time of the second correction. The density difference is written in the memory M23 (step 194).

[Measurement and adjustment: 3rd time]
The operator turns on the measurement start switch SW1 again after a while after the adjustment of the second ink supply amount described above. The CPU 10A confirms that the measurement start switch SW1 is turned on (FIG. 16: YES in step 109), sets the stored contents of the memory M5 to “0” (step 110), and transmits the number of printed sheets to the printing press control device 12. A command is sent (FIG. 17: step 111). The printing press control device 12 receives a print number transmission command from the ink supply amount adjustment device 10, and transmits the print number x3m of the printed matter at that time to the ink supply amount adjustment device 10.

  The CPU 10A receives the number of printed sheets x3m from the printing press control device 12 (YES in step 112), and stores the received number of printed sheets x3m in the memory M9 as the number of printed sheets at the time of the current measurement (third time) (step). 113). The operator sets the x3m-th printed matter as a measurement target and sets it on the colorimeter 10L.

  The CPU 10A collects color data of patches of each color of the color bar printed on the x3m-th printed matter by automatically scanning the colorimeter 10L (steps 114 to 124). Then, the density value of each patch of each color is calculated from the collected color data of each patch of each color, and is stored in the memory M13 as the density value at the time of the current measurement (third time) (step 125). Further, the reference density value of each color is read from the memory M6 (step 189), the density value at the time of the current measurement of each patch of each color is subtracted from the reference density value of each color, and the density value of each patch of each color and the reference density of each color are subtracted. The difference from the value is obtained and stored in the memory M24 (step 190).

  Next, the CPU 10A reads from the memory M1 the number of printed pages at the time of past correction completion (FIG. 18: step 126). In this case, the memory M1 stores the number of printed sheets x1 at the completion of the first correction and the number of printed sheets x2 at the completion of the second correction as the number of printed sheets at the completion of the past correction. Therefore, the CPU 10A proceeds to step 128 in response to NO in step 127, and reads the number of printed sheets x3m at the current measurement from the memory M9.

  Then, the number of printed sheets x1 at the completion of the first correction is read from the memory M1 (step 129), and the number of printed sheets x1 at the completion of the first correction is subtracted from the number of printed sheets x3m at the current measurement. The number of printed sheets “x3m−x1” from the current measurement to the current measurement is obtained and stored in the memory M14 (step 130). Then, the number of printed sheets xs required until the ink supply amount is stabilized is read from the memory M15 (step 131), and the number of printed sheets “x3m−x1” from the completion of the first correction to the current measurement is compared with xs. (FIG. 19: Step 132).

  If “x3m−x1” is smaller than xs (YES in step 132), the correction amount of each ink key opening amount at the time of the first correction is read from the memory M2 (step 133), and the first time from the memory M23. The density difference to be corrected for each color patch at the time of correction is read (step 195), and the number of printed sheets-ink density characteristic curve for each color is read from the memory M16 (step 136).

  Then, using the number of printed sheets of each color-ink density characteristic curve, the number of printed sheets “x3m−x1” from the completion of the first correction to the current measurement, the correction amount of each ink key opening amount at the first correction, and From the density difference to be corrected for each color patch at the time of the first correction, the remaining density change amount of each patch of each color that should be at the current measurement relative to the first correction is calculated and stored in the memory M17 (step 137). '). Then, the remaining density change amount of each patch of each color that should be present measurement for the first correction obtained in step 137 ′ is stored in the memory M5 as the remaining amount of each patch of each color that should be present measurement for the past correction. The total value of the density change amount is written (step 138).

  Next, the CPU 10A checks whether or not the memory M1 has the number of printed sheets at the time of past correction completion in addition to x1 (step 144). In this case, x2 is left in the memory M1 as the number of printed sheets when past corrections are completed. Therefore, the CPU 10A proceeds to step 145 shown in FIG. 20 in response to NO in step 144, and reads the number of printed sheets x3m at the current measurement from the memory M9. Further, the number of printed sheets at the completion of the next past correction, that is, the remaining number of printed sheets x2 at the completion of the second correction is read from the memory M1 (step 146).

  Then, the number of printed sheets x2 at the completion of the second correction is subtracted from the number of printed sheets x3m at the current measurement to obtain the number of printed sheets “x3m−x2” from the completion of the second modification to the current measurement, and stored in the memory M14. (Step 147). Then, the number of printed sheets xs required until the ink supply amount is stabilized is read from the memory M15 (step 148), and the number of printed sheets “x3m−x2” from the completion of the second correction to the current measurement is compared with xs. (Step 149).

  If “x3m−x2” is smaller than xs (YES in step 149), the correction amount of each ink key opening amount at the time of the second correction is read from the memory M2 (step 150), and the second time from the memory M23. The density difference to be corrected of each color patch at the time of correction is read (step 196), and the number of printed sheets-ink density characteristic curve of each color is read from the memory M16 (step 153).

  Then, using the number of printed sheets of each color-ink density characteristic curve, the number of printed sheets “x2m−x2” from the completion of the second correction to the current measurement, the correction amount of the opening amount of each ink key at the second correction, and From the density difference to be corrected for each patch of each color at the time of the second correction, the remaining density change amount of each patch of each color that should be at the current measurement with respect to the second correction is calculated and stored in the memory M17 (step 154). ').

  Then, the total density change amount of each patch of each color that should be present measurement with respect to the past correction is read from the memory M5, that is, the remaining density of each patch of each color that should be present measurement with respect to the first correction. The amount of change is read out (step 155), and the remaining density change of each patch of each color that should be present during the current measurement with respect to the first correction is changed to the remaining density change of each patch that should be present during the current measurement with respect to the second correction. The amount is added, and this is written in the memory M5 as the total value of the remaining density change amount of each patch of each color that should be presently measured with respect to a new past correction (step 156).

  Next, the CPU 10A confirms that, in addition to x1 and x2, the number of printed sheets in the past correction completion is not stored in the memory M1 (YES in step 161), and the process proceeds to step 196 shown in FIG. Thus, the difference between the density value of each patch of each color and the reference density value of each color is read. Further, the total value of the remaining density change amount of each patch of each color that should be presently measured for the past correction is read from the memory M5 (step 163). Then, the difference between the density value of each patch of each color and the reference density value of each color is subtracted from the total density change amount of each patch of each color that should be at the time of the current measurement with respect to past corrections. The density difference to be corrected is obtained and stored in the memory M19 (step 197).

  Thereafter, similarly to the first time and the second time, steps 170 to 176 are executed to correct the opening amount of each ink key. When a correction completion signal for the ink key opening amount is received from all the ink key control devices 11 (YES in step 177), the CPU 10A sends a print number transmission command to the printing press control device 12 (FIG. 22: step 178). In response to this transmission command, when the number of printed sheets x3 at that time is transmitted from the printing press control device 12 (YES in step 179), the number of printed sheets x3 is stored in the memory M1 as the number of printed sheets when the third correction is completed. (Step 180).

  Also, the correction amount of each ink key opening amount is read from the memory M22 (step 181), and the read correction amount of each ink key opening amount is written in the memory M2 as the correction amount of the ink key opening amount at the third correction. (Step 182). Further, the density difference to be corrected for each color patch is read from the memory M19 (step 193), and the density difference to be corrected for each read color patch is corrected for each color patch at the time of the third correction. The density difference is written in the memory M23 (step 194).

  In step 132 (FIG. 19), if “x3m−x1” is larger than xs, that is, if the number of printed sheets x3m at the current measurement exceeds x1 + xs (x3m ≧ (x1 + xs)), the first time from the memory M1. Is deleted (step 140), the amount of opening of each ink key at the time of the first correction is deleted from the memory M2 (step 141), and the value at the time of the first correction is deleted from the memory M23. The density difference to be corrected for each patch of each color is deleted (step 198).

  In step 149 (FIG. 20), if “x3m−x2” is larger than xs, that is, if the number of printed sheets x3m at the current measurement exceeds x2 + xs (x3m ≧ (x2 + xs)), the second time from the memory M1. Is deleted (step 157), the correction amount of each ink key opening amount at the time of the second correction is deleted from the memory M2 (step 158), and the second correction time is corrected from the memory M23. The density difference to be corrected for each patch of each color is deleted (step 199).

  Thereafter, the measurement of the density value and the adjustment of the ink supply amount are repeated in the same manner. Here, the total value of the remaining density change amounts of the patches of the respective colors that should be in the current measurement with respect to the past correction obtained in step 156 (FIG. 20) corresponds to yn ′ represented by the equation (13). .

It is a figure explaining the principle of the ink supply amount adjustment method of the printing press which concerns on this invention. It is a block diagram of an ink supply amount adjusting device showing an embodiment (Embodiment 1) of the present invention. It is a block diagram of an ink key control device connected to the ink supply amount adjusting device. It is a block diagram of the printing press control apparatus connected to this ink supply amount adjusting apparatus. It is a side view which shows the installation condition of a colorimeter. 4 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the first embodiment. 4 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the first embodiment. 4 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the first embodiment. 4 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the first embodiment. 4 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the first embodiment. 4 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the first embodiment. 4 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the first embodiment. It is a flowchart which shows the processing operation of a printing press control apparatus. It is a flowchart which shows the processing operation of an ink key control apparatus. It is a block diagram of an ink supply amount adjusting device showing an embodiment (Embodiment 2) of the present invention. 6 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the second embodiment. 6 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the second embodiment. 6 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the second embodiment. 6 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the second embodiment. 6 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the second embodiment. 6 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the second embodiment. 6 is a flowchart illustrating a processing operation of the ink supply amount adjusting apparatus according to the second embodiment. 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 top view which shows the outline of the printed matter printed by the printing machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Ink fountain, 2 ... Ink, 3 ... Ink fountain roller, 4 (4-1 to 4-n) ... Ink key, 5 ... Ink transfer roller, 6 ... Ink roller group, 7 ... Printing plate, 8 ... Plate cylinder, 9 ... Printed matter, 9-2 ... Color bar, 9a (9a1, 9a2, 9a3, 9a4) ... Patch for density measurement, 10 ... Ink supply amount adjusting device, 10A ... CPU, 10B ... RAM, 10C ... ROM, 10D ... Input Device, SW1 ... Measurement start switch, SW2 ... Control end switch, 10L ... Colorimeter, M1-M24 ... Memory, 11 ... Ink key control device, 12 ... Printing press control device.

Claims (12)

A printing machine that measures a density value of a printed material, calculates a density difference between the measured density value and a preset reference density value, and adjusts an ink supply amount to the printing plate based on the determined density difference. In the ink supply amount adjustment method,
Counting the number of printed sheets of the printed matter;
Measuring the density value of the printed matter at a desired time after adjusting the amount of ink supplied to the printing plate;
Based on the density value of the printed matter measured at the desired time point and the count value of the number of printed sheets at that time, a correction value of the ink supply amount to the printing plate is obtained, and the printing press is determined based on the obtained correction value. A method for adjusting the ink supply amount of a printing press, comprising the step of readjusting the ink supply amount to the plate. In the ink supply amount adjustment method for a printing press according to claim 1,
The count value of the number of printed sheets is the number of printed sheets from the previous adjustment of the ink supply amount to the current measurement of the density value of the printed matter. In the ink supply amount adjustment method for a printing press according to claim 1,
The step of readjusting the ink supply amount to the printing plate is performed at the time of the current measurement of the printed matter estimated based on the density value of the printed matter measured at the desired time point and the count value of the number of printed sheets at that time. A correction value of an ink supply amount to the printing plate is obtained based on a density value to be obtained, and an ink supply amount to the printing plate is readjusted based on the obtained correction value. Ink supply amount adjustment method. In the ink supply amount adjustment method for a printing press according to claim 3,
An ink supply amount adjusting method, wherein the density value yn is expressed by the following equation (1), where yn is a density value to be estimated at the time of the estimated measurement of the printed matter.

In equation (1), x represents the number of printed sheets, y represents a density value, yt represents a target density value, n represents a current measurement number value, k represents 1 ≦ k ≦ n, and xnm <(xk + xs). Satisfactory minimum number of measurements, xnm is the number of printed sheets at the time of measurement, xs is the number of printed sheets required until the ink supply is stabilized, yim is the density value when the density value is measured for the i-th time, and α is Density value variation coefficient with respect to ink key opening amount, Ki is a correction value for the i-th ink key opening amount, f (x) is a density value change function (0 to 1) relating to the number of printed sheets, and xi is an i-th ink key opening amount. The number of printed sheets, yi, when the adjustment is made, indicates the density value that should be in the i-th density measurement estimated when the ink key opening amount is adjusted for the (i-1) th time. In the ink supply amount adjustment method for a printing press according to claim 1,
The step of readjusting the ink supply amount to the printing plate is performed at the time of the current measurement of the printed matter estimated based on the density value of the printed matter measured at the desired time point and the count value of the number of printed sheets at that time. A correction value of the ink supply amount to the printing plate is obtained based on the remaining density change amount that should be, and the ink supply amount to the printing plate is readjusted based on the obtained correction value Adjusting the ink supply amount of the machine. In the method for adjusting the ink supply amount of the printing press according to claim 5,
Ink supply amount adjustment method characterized in that, when yn 'is the remaining density change amount that should be present at the time of the estimation of the printed matter, the density change amount yn' is expressed by the following equation (2): .

However, in the formula (2), x represents the number of printed sheets, y represents the density value, n represents the current measurement number value, k represents the minimum measurement number value satisfying xnm <(xk + xs) with 1 ≦ k ≦ n, xnm is the number of printed sheets at the time of this measurement, xs is the number of printed sheets required until the ink supply amount is stabilized, yim is the density value when the density value is measured for the i-th time, and α is the change in the density value with respect to the ink key opening amount. A quantity coefficient, Ki is a correction value of the i-th ink key opening amount, f (x) is a density value change function (0 to 1) relating to the number of printed sheets, and xi is the number of printed sheets when the ink key opening amount is adjusted for the i-th time. , Yi indicates a density value that should be present at the i-th density measurement estimated when the ink key opening amount is adjusted for the (i-1) th time. A density value measuring means for measuring the density value of the printed material;
A density difference calculating means for obtaining a density difference between the density value measured by the density value measuring means and a preset reference density value;
In an ink supply amount adjusting device of a printing press that adjusts an ink supply amount to a printing plate based on a density difference obtained by the density difference calculating means,
Means for counting the number of printed sheets of the printed matter;
Obtaining a correction value of the ink supply amount to the printing plate based on the density value of the printed matter measured at a desired time after adjusting the ink supply amount to the printing plate and the count value of the number of printed sheets at that time, An ink supply amount adjusting device for a printing press, comprising: means for readjusting an ink supply amount to the printing plate based on the obtained correction value. In the ink supply amount adjusting device for a printing press according to claim 7,
The count value of the number of printed sheets is the number of printed sheets from the previous adjustment of the ink supply amount to the current measurement of the density value of the printed matter. In the ink supply amount adjusting device for a printing press according to claim 7,
The means for re-adjusting the ink supply amount to the printing plate is used for the current measurement of the printed matter estimated based on the density value of the printed matter measured at the desired time point and the count value of the number of printed sheets at that time. A correction value of an ink supply amount to the printing plate is obtained based on a density value to be obtained, and an ink supply amount to the printing plate is readjusted based on the obtained correction value. Ink supply adjustment device. In the ink supply amount adjusting device for a printing press according to claim 9,
An ink supply amount adjusting device according to claim 1, wherein when the estimated density value of the printed matter at this time is yn, the density value yn is expressed by the following equation (3).

In equation (3), x represents the number of printed sheets, y represents a density value, yt represents a target density value, n represents a current measurement value, k represents 1 ≦ k ≦ n, and xnm <(xk + xs). Satisfactory minimum number of measurements, xnm is the number of printed sheets at the time of measurement, xs is the number of printed sheets required until the ink supply is stabilized, yim is the density value when the density value is measured for the i-th time, and α is Density value variation coefficient with respect to ink key opening amount, Ki is a correction value for the i-th ink key opening amount, f (x) is a density value change function (0 to 1) relating to the number of printed sheets, and xi is an i-th ink key opening amount. The number of printed sheets, yi, when the adjustment is made, indicates the density value that should be in the i-th density measurement estimated when the ink key opening amount is adjusted for the (i-1) th time. In the ink supply amount adjusting device for a printing press according to claim 7,
The means for re-adjusting the ink supply amount to the printing plate is used for the current measurement of the printed matter estimated based on the density value of the printed matter measured at the desired time point and the count value of the number of printed sheets at that time. A correction value of the ink supply amount to the printing plate is obtained based on the remaining density change amount that should be, and the ink supply amount to the printing plate is readjusted based on the obtained correction value Ink supply adjustment device for the machine. In the ink supply amount adjusting device for a printing press according to claim 11,
Ink supply amount adjusting device characterized in that, when the estimated density change amount that should be present at the current measurement of the printed matter is yn ', the density change amount yn' is expressed by the following equation (4): .

However, in the equation (4), x represents the number of printed sheets, y represents the density value, n represents the current measurement number value, k represents the minimum measurement number value satisfying xnm <(xk + xs) with 1 ≦ k ≦ n, xnm is the number of printed sheets at the time of this measurement, xs is the number of printed sheets required until the ink supply amount is stabilized, yim is the density value when the density value is measured for the i-th time, and α is the change in the density value with respect to the ink key opening amount. A quantity coefficient, Ki is a correction value of the i-th ink key opening amount, f (x) is a density value change function (0 to 1) relating to the number of printed sheets, and xi is the number of printed sheets when the ink key opening amount is adjusted for the i-th time. , Yi indicates a density value that should be present at the i-th density measurement estimated when the ink key opening amount is adjusted for the (i-1) th time.

Images