JP2005022111A - Apparatus for judging abnormal site of printing machine, printing machine, program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for judging an abnormal site of a printing machine, which analyzes a printing result on every changeable region on an amount of ink feeding and specifies the abnormal site of an offset printing machine, or the like. <P>SOLUTION: The printing machine 101 prints printed matter 107 of a maintenance printing plate 800 including a solid patch 801 and a ghost chart 802 arranged on every ink feeding changeable region, and a densitometer 103 measures a density distribution of the printed matter 107, and the result of measurement is transmitted to a judging apparatus 105 side. A control part 501 of the judging apparatus 105 calculates indices such as fluctuation of the density, inclination and ghost based on the density distribution of the result of measurement and the printed matter 107, and quantifies the condition of the printing machine 101, and judges the abnormal site of the printing machine 101 based on the indices to confirm/adjust the corresponding site. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of offset printing machines, and particularly relates to an apparatus for determining an abnormal part of an offset printing machine.
[0002]
[Prior art]
Conventionally, maintenance of a printing press has been instructed and performed every certain period.
[0003]
There is also an adjusting device for adjusting a roller of an offset printing machine (for example, Patent Document 1). This roller adjusting device estimates the amount of ink and the amount of dampening water on a roller close to the plate cylinder of the printing press, and adjusts the roller nip using the results.
[0004]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-205786
[Problems to be solved by the invention]
In conventional maintenance, the concept of grasping the state of the printing press and adjusting necessary parts has not been introduced, and after a certain period, the printing machine is stopped for a certain period of time, even if maintenance is not necessary, It was necessary to maintain the adjustment part. Therefore, the maintenance work takes a lot of time and the load on the operator is heavy.
[0006]
In addition, the conventional roller adjustment device has the disadvantage that it cannot be determined whether the ink supply unit or the ink roller should be adjusted, the sensor itself is very expensive, the mounting accuracy is strict, and the sensor There is a problem that it takes time and effort to maintain and prevent soiling.
[0007]
The present invention has been made in view of the above points, and provides an apparatus for determining an abnormal part of a printing press that analyzes a printing result for each ink supply amount variable region and identifies an abnormal part of an offset printing press. With the goal.
[0008]
[Means for Solving the Problems]
In order to achieve the above-described object, the first invention is a determination device for determining an abnormal portion of a printing press, and measures the density distribution of the printing result for each ink supply amount variable region printed by the printing press. Means, quantification means for calculating an index based on the density distribution as a measurement result, and the printing result, and quantifying the state of the printing press, and an abnormal part of the printing press based on the index A determination unit for determining an abnormal portion of the printing press.
[0009]
In order to achieve the above-mentioned object, a second invention is a printing machine comprising the printer abnormality site determination apparatus according to claim 1.
[0010]
The quantification unit preferably further includes a calculation unit that calculates an index such as a variation in the density distribution, an inclination, a difference between the maximum density and the minimum density in the printing machine width direction based on the density distribution. .
The quantification means preferably further comprises ghost quantification means for counting and quantifying ghosts in the linear pattern chart as the print result. In addition, it is desirable to further include an adjustment unit that confirms and adjusts the abnormal portion of the printing press specified by the determination unit.
[0011]
In the first invention, the density distribution of the printing result for each ink supply amount variable region printed by the printing press is measured, the index is calculated based on the density distribution as the measurement result and the printing result, and the status of the printing press And determining an abnormal portion of the printing press based on the index.
[0012]
The second invention is an invention relating to a printing press provided with a determination device for an abnormal portion of the printing press.
[0013]
“Print results” include “solid patches”, which are color measurement patches used for printing, in each variable ink supply amount area, and include “ghost charts”, which are multiple linear pattern charts with different thicknesses. A printing plate is used that has an image area ratio corresponding to the amount of ink supplied.
The “measuring means” is any one of a densitometer, a color meter, a CCD camera, and the like, and measures the density of a color measurement patch used for printing for each ink supply amount variable region of the printing result.
“Indicator” includes variation in density distribution, inclination, difference between maximum density and minimum density in the width direction of the printing press, ghost, and the like.
“Ghost” is a portion where shading is recognized in the solid portion of the ghost chart.
[0014]
The third invention is a program for causing a computer to function as the printer abnormal part determining apparatus according to the first invention.
A fourth invention is a recording medium on which a program for causing a computer to function as the printer abnormal part determining apparatus according to the first invention is recorded.
[0015]
The above-mentioned program may be held and distributed on a recording medium such as a CD-ROM, or the program can be transmitted and received via a communication line.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a printing press maintenance system, a printing press abnormality site determination device, and the like according to the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, the same reference numerals are given to components having substantially the same functional configuration, and redundant description is omitted.
[0017]
FIG. 1 is a diagram showing a schematic configuration of a printing press maintenance system 100 according to the present embodiment of the present invention.
[0018]
As shown in FIG. 1, the printing press maintenance system 100 includes printing presses 101-1, 101-2, 101-3, 101-4, a densitometer 103, a determination device 105, a communication line 109, and the like. The printing presses 101-1, 101-2, 101-3, and 101-4 and the densitometer 103 are connected to the determination device 105 via the communication line 109. The communication line 109 may be wired or wireless.
[0019]
The printing machines 101-1, 101-2, 101-3, and 101-4 are offset printing machines composed of a plurality of rollers, and are respectively black (blacK), indigo (Cyan), red (Magenta), and yellow. (Yellow) is a printing machine using four colors of ink, the printing machine 101-1 is a black (K) unit, the printing machine 101-2 is an indigo (C) unit, and the printing machine 101-3 is a red (M) unit. The printing machine 101-4 is a yellow (Y) unit. The printing machines 101-1, 101-2, 101-3, and 101-4 sequentially print the maintenance printed matter 107.
[0020]
The densitometer 103 measures the density of the print result for each ink supply amount variable area (for each ink key area) of the printed matter 107 and transmits the measurement result to the computer 105. In the present embodiment, the densitometer 103 is used, but a color meter, a CCD camera, or the like may be used.
[0021]
The determination apparatus 105 is an abnormal part determination apparatus for a printing press, and is a personal computer or the like. Obtains a density distribution as measurement data from the densitometer 103, calculates an index based on the density distribution and the printing result, determines an abnormal part of the printing press 101 based on the index, and confirms the corresponding part / Make adjustments.
[0022]
Next, FIG. 2 showing the movement of the printing machine 101-1 shows a schematic side sectional view of the printing unit 200 of the printing machine 101. FIG. 3 is an enlarged side sectional view of the ink key 201 and the ink base roller 202. FIG. 4 is a schematic cross-sectional view showing the configuration of the ink key 201 group.
[0023]
2, the printing unit 200 of the printing machine 101-1 includes an ink key 201, an ink base roller 202, a delivery roller 203, a rubber roller 204 group (T 1 to T 4), and a swing roller 205 group that swings in the rotation direction of the roller. (V1 to V4), ink roller 206 group (F1 to F3), plate cylinder 207, blanket cylinder (blanket cylinder) 208, water boat 209, water source roller 210, ink fountain 211, ink 212 in ink fountain, printing paper 220 grades.
[0024]
As shown in FIG. 3, the ink 212 in the ink fountain 211 is supplied to the ink source roller 202 only by the amount of the gap 301 between the ink key 201 and the ink source roller 202.
[0025]
The supplied ink is transferred from the ink source roller 202 to the delivery roller 203, passes through the rubber roller 204 group and the swing roller 205 group, and adheres to the plate cylinder 207 via the ink roller 206 group. Printing is performed by moving to the cylinder 208 and moving onto the printing paper 220. Further, the fountain solution is supplied from the water boat 209 to the plate surface of the plate wound around the plate cylinder 207 through a number of landing rollers by rotating one water source roller 210. 2 illustrates the roller arrangement of the printing unit 200 that performs single-sided printing on the printing paper 220, the printing machine 101-1 can simultaneously perform double-sided printing on the printing paper 220. A roller group of the same printing unit 200 ′ is arranged symmetrically with the printing unit 200 on the lower side.
[0026]
As shown in FIG. 4, the front end of the ink supply unit 400 of the printing machine 101-1 has a partition plate 401 at both ends, a plurality (No. 1 to No. 25) of ink keys 201, and the like. The ink supply amount can be changed every 201, and when the maintenance plate is printed, the ink key is adjusted so that the ink supply amount becomes the ink supply amount corresponding to the pattern area ratio such as the ink key width.
[0027]
Next, the hardware configuration of the determination apparatus 105 (computer) will be described. FIG. 5 is a hardware configuration diagram of the determination apparatus 105 (computer).
[0028]
As shown in FIG. 5, the determination device 105 (computer) includes a control unit 501, a storage device 502 (hard disk), a media input / output unit 503 (CD-ROM), a communication control unit 504 (communication control device, communication port, etc.). An input unit 505 (keyboard, mouse, etc.), a printing unit 506 (printer), a display unit 507 (display), etc. are connected via a bus 509.
[0029]
The control unit 501 includes a CPU, a ROM, a RAM, and the like, and drives and controls each device connected via the bus 509 in accordance with a program stored in the storage device 502 as a large-capacity storage medium.
[0030]
The storage device 502 (hard disk) stores a control program for driving and controlling each component, a determination program, and various threshold information for an index used in the determination program.
[0031]
Each of these program codes is read by the control unit 501 as necessary, transferred to the RAM, read by the CPU, and executed as various means.
[0032]
The media input / output unit 503 (CD-ROM drive device) is used to upgrade the program and information stored in the ROM of the control unit 501 and the storage device 502, and to make settings such as device settings. The main unit is switched to the management mode, a CD-ROM for upgrading is inserted into the media input / output unit 503, and data is rewritten.
[0033]
The communication control unit 504 is a communication control device, a communication port, and the like. Perform communication control.
[0034]
The input unit 505 is a keyboard, a mouse, and the like, and performs operation guidance, various processes, and operations displayed on the display unit 507 (display).
A printing unit 506 is a printer and performs print output processing.
[0035]
Next, the processing procedure of the printing press maintenance system 100 will be described with reference to FIGS.
[0036]
6 and 7 are flowcharts showing the processing procedure of the printing press maintenance system 100.
[0037]
The printing machines 101-1, 101-2, 101-3, and 101-4 print the maintenance version and output the printed matter 107 (step 601). The printers 101-1, 101-2, 101-3, and 101-4 print a maintenance plate in advance with an estimated ink supply amount in order to determine the necessity of maintenance.
[0038]
FIG. 8 shows a printed product 107 of a maintenance version. As shown in FIG. 8, the maintenance plate 800 includes a solid patch 801 and a ghost chart 802 that are arranged for each printing press ink supply variable region.
The solid patch 801 is a measurement patch for colors (indigo (C), red (M), yellow (Y), and black (K)) to be used for printing in each ink supply variable region that is an ink key region. The ghost chart 802 is a plurality of linear pattern charts whose line widths (for example, 1 pt, 2.5 pt, 5 pt, etc.) are changed step by step, and the colors to be used (indigo (C), red (M) , A ghost chart 802 is arranged for each of yellow (Y) and black (K).
[0039]
When the printing press 101 prints the maintenance plate 800 designed so that the area ratio is equal in the width direction, the ink supply amount is constant in the width direction of the printing press, and the density is measured sequentially while printing. The ink supply is adjusted so that becomes the reference density of each color. At this time, the ink supply amount is not adjusted partially, but is adjusted in the entire printing machine width direction.
[0040]
The densitometer 103 measures the density of the solid patch 801 in the width direction of the printed material 107 of the maintenance plate (step 602), and sends measurement data (corresponding to the ink key 201) to the control unit 501 of the determination apparatus 105 via the communication control unit 504. Density data to be transmitted) (step 603).
For example, the densitometer 103 places the measurement head portion of the densitometer 103 on the moving stage of the scanning mechanism. The determination device 105 controls the movement of the measurement head and the measurement operation, and collects data obtained by the measurement. The control unit 501 of the determination device 105 can calculate the density of the printed material 107 corresponding to the k-th ink key based on the measurement data obtained at an appropriate interval. That is, for example, the densitometer 33 measures the printed matter 107 and transmits the density y _i of the printed matter 107 corresponding to the i-th ink key 201- _i as a measured value.
[0041]
The control unit 501 of the determination apparatus 105 receives the measurement result from the densitometer 103 and analyzes the concentration distribution (step 604). FIG. 9 shows a concentration distribution 900 before and after maintenance.
As shown in FIG. 9, the vertical axis represents density, and the horizontal axis represents ink key No. And the density distribution 901 before the maintenance is performed from the measurement result of the density corresponding to the ink key 201. For example, a density distribution 900 with respect to the upper cylinder of the printing press 101-2 (indigo (C) unit) is represented. Reference numeral 902 denotes a concentration distribution after maintenance is performed.
[0042]
The control unit 501 calculates a density difference ΔD between the maximum density and the minimum density in the printing machine width direction from the received measurement result (step 605). It is determined whether the density difference ΔD is smaller than a predetermined threshold stored in the storage device 502 (step 606). If the density difference ΔD ≦ (predetermined threshold) (Yes in step 606), ink supply such as the ink key 201 is performed. The unit is regarded as having no abnormality, and the process proceeds to step 703 where density gradient calculation processing is performed.
[0043]
When the density difference ΔD> (predetermined threshold) (No in Step 606), the control unit 501 determines the colors (indigo (C), red (M), yellow (Y), black, based on the density distribution of the measurement result. (K)) A standard deviation σ which is a variation in density is calculated every time.
Using the density y _i (i = 1,... N) (for example, the number of measurement data n = 25) of the printed matter 107 corresponding to the i-th ink key 201-i,
The formula for calculating the standard deviation σ of concentration is
σ = √V (V: variance) (1) Formula V = (Σ (y _i −Y) ² ) / n (Y: average)
Y = Σy _i / n
It is represented by
[0044]
It is determined whether the standard deviation σ of the density is smaller than a predetermined threshold (for example, 0.07) stored in the storage device 502 (step 608). If standard deviation σ ≦ (predetermined threshold) (step 608) Yes), it is considered that there is no abnormality in the ink supply unit such as the ink key 201, and the process proceeds to step 703, and density gradient calculation processing is performed.
[0045]
If standard deviation σ> (predetermined threshold) (No in step 608), the setting of the key 0 point is confirmed and the operation of the ink supply unit such as the ink key 201 is confirmed (step 609). The key 0 point indicates that the gap 301 between the ink key 201 and the ink source roller 202 shown in FIG. 3 is a reference value, and it is confirmed whether a large deviation of the key 0 point has occurred.
[0046]
If there is an abnormality in the setting confirmation of the key 0 point and the operation confirmation of the ink supply unit such as the ink key 201 (NG in step 609), the corresponding part of the ink supply unit such as the ink key 201 is adjusted (step 610).
In the offset printing press with water, when the density at the end of the printing press is extremely low (or high), a water deficiency may be considered, so the state of the dampening apparatus is checked / adjusted.
[0047]
A roller abnormality check is performed (step 701). Check the roller rubber for deterioration, cracks, irregularities, foreign matter, etc. If there is an abnormality in the roller (NG in step 701), the corresponding part of the roller is adjusted (step 702).
[0048]
The control unit 501 calculates a concentration gradient a from the measurement result (step 703). In FIG. 9, the vertical axis represents density, and the horizontal axis represents ink key No. In this case, the gradient of density is calculated. Using a known least square method, (error ε) ² is minimized, a regression line: y _i = ax _i + b is obtained, and the slope a is calculated.
[0049]
The density y _i (i = 1,... N) of the printed matter 107 corresponding to the i-th ink key 201-i, the corresponding key No. x _i , regression line: y _i = ax _i + b, error ε _i
y _i = ax _i + b + ε _i
ε _i = y _i -ax _i -b
Σε _i ² = Σ (y _i −ax _i −b) ² ,
In order to obtain a and b such that this is minimum, the result of partial differentiation of Σε _i ² by a and b is set to 0. That is,
∂ (Σε _i ² ) / ∂a = 0 (2) Equation ∂ (Σε _i ² ) / ∂b = 0 (3)
Σy _i −aΣx _i −Σb = 0 (4) Formula Σx _i y _i −aΣx _i ² −bΣx _i = 0 (5) where the number of measurement data is n, and the average of y _i is Y, If the average of _xi is X,
Σy _i = nY, Σx _i = nX, Σb = nb, and is substituted into the equations (4) and (5),
Inclination: a = (Σx _i y _i −nXY) / (Σx _i ² −nX ² )
Intercept: b = Y-aX
Is calculated.
[0050]
It is determined whether or not the calculated density gradient a is smaller than a predetermined threshold value (for example, 0.07) stored in the storage device 502 (step 704). If density gradient a ≦ (predetermined threshold value) (step 704) 704), it is considered that there is no abnormality in the roller, the roller nip, etc., and the process proceeds to step 707, and the ghost check process is performed.
[0051]
When the density gradient a> (predetermined threshold) (No in Step 704), nip pieces of kneading rollers and dampening rollers may be considered, and the roller nip of each part is checked (Step 705). If there is an abnormality in the roller nip confirmation (NG in step 705), the roller nip of the corresponding part is adjusted (step 706).
[0052]
The control unit 501 confirms, counts, and quantifies the ghost from the ghost chart 802 of the printed matter 107 (step 707). FIG. 10 shows a ghost quantification 1000. As shown in FIG. 10, a portion of the ghost chart 802 where darkness is recognized is a ghost 1001, and the number of ghosts 2001 is quantified (for example, three ghosts are confirmed).
When the ghost 1001 is confirmed (NG in step 707), the nip balance of the oscillating roller 205 is considered to be poor, and the nip adjustment of the oscillating roller 205 is performed based on the quantified partial difference of the ghost 1001 (step 708). ).
[0053]
It should be noted that the key 0 point setting confirmation in steps 609 and 610, the operation confirmation / adjustment process of the ink supply unit such as the ink key 201, the roller abnormality confirmation / adjustment process in steps 701 and 702, the roller nip confirmation in steps 705 and 706 / For the adjustment process, the ghost confirmation / oscillation roller adjustment process in steps 707 and 708, etc., the control unit 501 uses the communication line 109 to control the printing machines 101-1, 101-2, 101-3, and 101-4. Remote operation or automatic control can be performed by issuing a confirmation instruction to the abnormal part and adjusting according to the confirmation result from the printing press 101.
[0054]
After confirming and adjusting the printing press 101, the printing press 101 prints the maintenance plate again, the densitometer 103 measures the density distribution of the printed matter 107 that has been output, and the control unit 501 performs a determination process based on the measurement result and the printed matter. Check the effect of maintenance. It can be seen that the concentration distribution 902 after the maintenance in FIG. 9 has a small concentration variation, inclination, etc., and a maintenance effect appears. Further, the adjustment is performed again for the portion where the effect does not appear.
[0055]
As described above, according to the embodiment of the present invention, the printing press 101 that is an offset printing press prints the maintenance plate 800 including the solid patch 801 and the ghost chart 802 for each ink supply variable region. The densitometer 103 measures the density distribution of the printed matter 107 and transmits the measurement result to the control unit 501 of the determination apparatus 105. Based on the density distribution of the measurement result and the printing result, the control unit 501 of the determination apparatus 105 determines the density variation (standard deviation), the inclination, the difference between the maximum density and the minimum density in the width direction of the printing press, the ghost Etc., the state of the printing press 101 is quantified, the abnormal portion of the printing press 101 is determined based on each index, and the corresponding portion is confirmed / adjusted.
[0056]
Thereby, since a maintenance required part is estimated to some extent, the load and time required for maintenance can be reduced.
In addition, since the necessity and effect of maintenance can be grasped quantitatively, it is possible to clearly determine the maintenance time and the implementation effect that were unclear.
[0057]
Note that the program for performing the processing shown in FIGS. 6 and 7 may be distributed on a recording medium such as a CD-ROM, or the program may be transmitted and received via a communication line.
[0058]
The preferred embodiments of the printing press maintenance system and the like according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.
[0059]
The preferred embodiments of the printing press maintenance system and the like according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these are naturally within the technical scope of the present invention. Understood.
[0060]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a determination device for an abnormal part of a printing press that analyzes a printing result for each ink supply amount variable region and identifies an abnormal part of an offset printing press.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a printing press maintenance system 100 according to the present embodiment. FIG. 2 is a schematic side sectional view of a printing unit 200 of a printing press 101. FIG. 3 is an enlarged view of an ink key 201 and an ink source roller 202. FIG. 4 is a schematic sectional view showing the configuration of the ink key 201 group. FIG. 5 is a hardware configuration diagram of the determination device 105 (computer). FIG. 6 is a flowchart showing a processing procedure of the printing press maintenance system 100. FIG. 8 is a flow chart showing the processing procedure of the printing press maintenance system 100. FIG. 8 is a drawing showing a maintenance version printed matter 107. FIG. 9 is a drawing showing a concentration distribution 900 before and after maintenance. [Explanation of symbols]
100 ......... Printer maintenance system 101 ......... Printer 103 ......... Density meter 105 ......... Determination device (computer)
107 .... Printed matter 109 ..... Communication line 201 ..... Ink key 501 ..... Control unit 502 ..... Storage device 801 ..... Solid patch 802 ..... Ghost chart

Claims (13)

A determination device for determining an abnormal part of a printing press,
Measuring means for measuring a density distribution of a printing result for each ink supply amount variable region printed by the printing machine;
Quantification means for calculating an index based on the density distribution as a measurement result and the printing result, and quantifying the state of the printing press,
A determination unit for determining an abnormal part of the printing press based on the index. The apparatus for determining an abnormal portion of a printing press according to claim 1, wherein the printing result uses a printing plate in which measurement patches of colors used for printing are arranged for each ink supply amount variable region. 2. The apparatus according to claim 1, wherein the printing result uses a printing plate having an image area ratio obtained by matching a printing pattern with an ink supply amount. The printing apparatus abnormality site determination apparatus according to claim 1, wherein the printing result includes a printing plate including a plurality of linear pattern charts having different thicknesses. The apparatus according to claim 1, wherein the measuring means is any one of a densitometer, a color meter, a CCD camera, and the like. 2. The apparatus according to claim 1, wherein the measuring unit measures a density of a color measurement patch used for printing for each ink supply amount variable region of the printing result. The quantification means includes
2. The calculation unit according to claim 1, further comprising: a calculation unit configured to calculate an index such as a variation in density distribution, a gradient, a difference between a maximum density and a minimum density in a printing machine width direction based on the density distribution. Judgment device for abnormal parts of printing press. The quantification means includes
The apparatus according to claim 1, further comprising a ghost quantification unit that counts and quantifies ghosts in the linear pattern chart of the printing result. 2. The apparatus for determining an abnormal part of a printing press according to claim 1, wherein the index is at least one of a variation, inclination of the density distribution, a difference between the highest density and the lowest density in the printing machine width direction, a ghost, and the like. . The apparatus for determining an abnormal part of a printing press according to claim 1, further comprising an adjusting unit for confirming and adjusting an abnormal part of the printing press specified by the determination unit. A printing machine comprising the printer abnormal part determining apparatus according to claim 1. A program for causing a computer to function as a determination device for an abnormal portion of a printing press according to any one of claims 1 to 10. 11. A recording medium on which a program for causing a computer to function as the printer abnormal part determining apparatus according to claim 1 is recorded.

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