JP2004050630A - Method for operating printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable the number of spoiled sheets occurring at a print starting time to be reduced. <P>SOLUTION: A method for operating a printing machine includes the steps of setting an ink in an ink roller group 30 including a plate cylinder 36 in a balanced state while the group 30 is rotated at a high speed in a state in which a printing cylinder 40 is drawn, impression throwing in the cylinder 40 while the group 30 remains rotating at a high speed after the ink balanced state is formed, and then starting printing. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of operating a printing press at the start of printing and at the end of printing, which is suitable for use in a printing press capable of removing and inserting a printing cylinder in a high-speed rotation state.
[0002]
[Prior art]
In a printing press, it is required that the printed color of the printed material matches the sample color (target color) of the printed sample, and a printed material in which the color tone difference between the printed color and the target color exceeds an allowable range is not considered a product. Treated as paper. Since the occurrence of waste paper wastes resources and increases production costs, in the field of printing, how to reduce the number of waste paper sheets generated at the start of printing has been an important issue. To date, various techniques have been proposed for suppressing the generation of waste paper.
[0003]
Conventionally proposed techniques for suppressing the occurrence of waste paper are broadly classified into those based on feedforward control and those based on feedback control. As an example of the former, there is a technique disclosed in JP-A-8-1914. In this technology, data is accumulated on the relationship between printing conditions (picture area ratio, ink source roller temperature, paper quality, etc.) that greatly affect the printing color and the amount of ink supply after color matching, and this printing is performed. By calculating the ink supply amount according to the condition from the accumulated data and presetting the ink supply device, the print color of the printed matter matches the target color.
[0004]
As an example of the latter, there is a technique disclosed in JP-A-8-132595. In this technique, first, a control wavelength and a target reflectance, which are wavelengths having the minimum spectral reflectance, are detected and stored from spectral reflectance data obtained by measuring a print sample with a spectrometer. Next, a spectral reflectance having a wavelength equal to the above control wavelength is extracted as a control reflectance from the spectral reflectance data obtained by measuring the printed matter with a spectrometer, and the control reflectance is compared with a target reflectance. Then, a deviation between them is calculated, and an ink amount increase / decrease signal for minimizing the deviation is calculated. Then, this ink amount increase / decrease signal is sent to the ink supply amount adjusting section of the printing unit of the printing press, and the ink supply amount is increased / decreased so that the print color of the printed matter matches the target color.
[0005]
[Problems to be solved by the invention]
In the former case, the printing color for determining the preset value can be matched with the target color with high accuracy by setting the printing conditions in detail, but the factors that affect the printing color include the printing surface Some factors cannot be predicted before printing starts, such as the temperature of the printer and the maintenance status of the machine. If these unpredictable factors change, the print color will deviate from the target color, and a waste sheet will be generated.
[0006]
On the other hand, in the latter case, even if the above-mentioned unpredictable factors change, the feedback can supply an accurate amount of ink for matching the print color to the target color. Therefore, by combining the former control method with the latter control method, it is considered that the number of waste sheets generated can be greatly reduced.
[0007]
However, a plurality of ink rollers (collectively referred to as an ink roller group) are arranged from the ink source roller to the plate cylinder, and ink is transferred to the plate cylinder while sequentially transferring from the ink source roller to the inside of the ink roller group. Supplied. For this reason, it takes time until the ink is equilibrated in the ink roller group and the amount of ink corresponding to the preset value is supplied to the plate surface of the plate cylinder, and the printing color of the printed matter obtained during that time is Since the color does not match the target color, a lot of waste paper is generated. The same applies to the feedback.It takes time for the ink to equilibrate in the ink roller group and supply a corrected amount of ink to the plate surface of the plate cylinder. Will also be wasted. In other words, even if the former control method is simply combined with the latter control method, the time required for the amount of ink corresponding to the preset value or the corrected amount to reach equilibrium in the ink roller group cannot be shortened. Waste paper is generated.
[0008]
SUMMARY OF THE INVENTION It is a first object of the present invention to provide a method of operating a printing press at the start of printing, which has been devised in view of such a problem, and which can further reduce the number of waste sheets generated at the start of printing. And
[0009]
By the way, conventionally, at the end of printing, an operation of reducing the overall ink amount in the ink roller group is performed by stopping the ink supply when the number of sheets to be printed is completed and performing additional printing of several sheets of paper. Was. However, this has only the effect of reducing the amount of ink in the ink roller group, and cannot eliminate the history of the ink level difference generated for each key zone of the ink key. Further, even when the ink mass balance in the ink roller group in the next printing is known in advance, it is not possible to adjust the ink mass balance and finish printing with the conventional operation method. For this reason, in the conventional operation method, it is necessary to perform an operation for eliminating the history of the ink level difference at the start of the next job or to adjust the ink mass balance, and printing cannot be started immediately. Was.
[0010]
Accordingly, a second object of the present invention is to provide a method of operating a printing press at the end of printing, which enables printing to be started immediately in the next job.
[0011]
[Means for Solving the Problems]
In order to achieve the first object, the present invention operates a printing press in the following procedure at the start of printing. First, as a first step, an ink supply amount supplied from the ink supply device or a parameter correlated to the ink supply amount is set based on predetermined printing conditions that affect a print color (initial setting step). The printing conditions include material information such as ink type and paper type, picture area ratio data, and mechanical information such as ink roller temperature. In addition, parameters correlated with the ink supply amount include an ink key opening degree, a rotation speed of an ink source roller, and the like.
[0012]
Next, while the printing cylinder is in an uncut state, the ink roller group including the plate cylinder is rotated at a high speed, and an amount of ink corresponding to the set value in the initial setting process is supplied from the ink supply device to the ink roller group. An ink equilibrium state is formed in the roller group (ink equilibrium forming step). At this time, the rotation speed of the ink roller group is preferably the same as the printing speed or a speed as close as possible. Since the equilibrium state of the ink is different between the high-speed rotation and the low-speed rotation, an ink equilibrium state close to the time of printing can be formed by rotating the ink roller group at a high speed in this manner. Also, during this time, since the printing cylinder has been removed, no waste paper occurs.
[0013]
Next, test printing is performed by inserting the printing cylinder while the ink roller group is rotating at a high speed (test printing step). By inserting the cylinder while rotating at high speed in this way, printing can be started while maintaining the ink equilibrium state close to that at the time of printing, shortening the time until the printing color is stabilized and reducing waste paper. Can be. Then, the printing color of the printed material obtained by the test printing is compared with the target color (comparing step). In addition, the printing cylinder is punched out (drum punching step). It should be noted that the cylinder punching step may be executed before the comparison step, or the cylinder punching step may be executed after the comparison step. In the former case, trial printing can be completed immediately to reduce the occurrence of waste paper, and in the latter case, if the print color of the printed material matches the target color, It is possible to shift to actual printing.
[0014]
If the print color of the printed material does not match the target color, the supply amount of ink supplied from the ink supply device or a parameter correlated to the ink supply amount is corrected based on the comparison result in the comparison step (feedback step). . Next, while the ink roller group is rotating at a high speed with the printing cylinder being in an uncut state, an amount of ink corresponding to the correction value in the feedback process is supplied from the ink supply device to the ink roller group. Is corrected (ink balance correction step). By correcting the ink supply amount in a state where the printing cylinder has been removed from the printing cylinder, it is possible to prevent the occurrence of waste paper. Further, by correcting the ink supply amount while rotating the ink roller group at a high speed, it is possible to form an ink equilibrium state close to the time of printing. Thereafter, the printing cylinder is inserted while the ink roller group is being rotated at a high speed, and a test printing is performed, and the above processing is repeatedly executed until the printing color of the printed material matches the target color.
[0015]
In addition, in order to achieve the second object, the present invention operates the printing press in the following procedure at the end of printing. First, the ink supply from the ink supply device to the ink roller group including the plate cylinder is stopped (ink supply stopping step). In addition, the printing cylinder is punched out (drum punching step). At this time, the printing cylinder may be removed before stopping the ink supply, or the printing cylinder may be removed after stopping the ink supply. Next, while rotating the ink roller group at a high speed, the oscillating roller included in the ink roller group and oscillating in the axial direction is driven to equalize the axial distribution of ink in the ink roller group (equalization processing). Process). By such processing, the number of waste sheets generated at the end of printing can be reduced, and printing can be started immediately in the next job by equalizing the axial distribution of ink.
[0016]
More preferably, the ink mass difference between the current ink mass amount in the ink roller group and the ink mass amount in the ink roller group required for the next job is calculated (ink mass difference calculating step). Then, the printing cylinder is inserted while the ink roller group is rotated at a high speed, and the number of sheets of paper corresponding to the ink mass difference is printed to reduce the amount of ink mass in the ink roller group (ink mass adjusting step). By such processing, the ink mass balance can be adjusted while minimizing the number of waste sheets, and printing can be started more quickly in the next job.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a configuration of a printing unit of a printing press and a control system thereof according to an embodiment of the present invention. As shown in FIG. 1, an ink supply device 20 including an ink source roller 26, an ink key 24, and a call roller 28 is arranged at the uppermost stream of the printing unit. An ink fountain 22 for storing ink is formed between the ink fountain roller 26 and the ink key 24, and the ink in the ink fountain 22 is drawn out from the gap between the ink fountain roller 26 and the ink key 24 by the rotation of the ink fountain roller 26. A plurality of ink keys 24 are arranged side by side in the axial direction (apparatus width direction) of the ink source roller 26, and each ink key 24 individually determines the gap amount (ink key opening degree) between the tip of the ink key 24 and the ink source roller 26. It can be adjusted. That is, the amount of ink supplied from the ink fountain 22 can be adjusted in units of the ink key 24 in the apparatus width direction.
[0018]
The call roller 28 reciprocates between the ink supply roller 26 and the ink transfer roller 34 located at the most upstream position of the downstream ink roller group 30, and transfers ink from the ink supply roller 26 to the ink transfer roller 34. I have. The supply of ink to the ink roller group 30 can be stopped by closing the ink key 24, or by stopping the swing of the call roller 28.
[0019]
A plurality of oscillating rollers 32 are arranged in the ink roller group 30. While the other ink rollers constituting the ink roller group 30 rotate only, the oscillating roller 32 also oscillates in the axial direction at the same time as it rotates, so that the ink is kneaded in the axial direction.
At the most downstream of the ink roller group 30, a plate cylinder 36 provided with a printing plate on its surface is arranged. The ink supplied from the ink supply device is appropriately kneaded in the process of sequentially transferring in the ink roller group 30, and then supplied to the plate cylinder 36. The ink supplied to the plate cylinder 36 is further transferred to the printing cylinder (blanket cylinder) 40 as a picture. Thereafter, the image is transferred to the paper surface of the printing paper traveling between the printing cylinder 40 and the impression cylinder 44, and the printing of the predetermined color is completed.
[0020]
In the present embodiment, the ink roller group 30 including the plate cylinder 36 is configured to rotate integrally, and is driven by a drive motor 46 independent of the printing press main body. As shown in FIG. 1, an ink scraping device 48 for scraping ink on the ink roller may be provided in the ink roller group 30. Further, the printing cylinder 40 is provided with a cylinder insertion mechanism 42 for attaching and detaching the printing cylinder 40 to and from the plate cylinder 36 and the impression cylinder 44. In FIG. 1, the position of the printing cylinder 40 indicated by a solid line is the position when the cylinder is removed (deposition position), and the position of the printing cylinder 40 indicated by the two-dot chain line is the position when the cylinder is inserted (wearing position). In the present embodiment, a high-speed cylinder insertion mechanism that can be attached and detached while rotating the printing cylinder 40 at a high speed equivalent to the printing speed is adopted as the cylinder insertion mechanism 42.
[0021]
The printing press according to the present embodiment includes a control device 10 for controlling the operation of the printing unit. The control device 10 includes an ink supply amount calculation unit 11, an operation operation control unit 12, a rotation control unit 13, an ink increase / decrease unit 14, a bin insertion control unit 15, and a swing control unit 16.
The ink supply amount calculation unit 11 has a function of calculating the amount of ink supplied from the ink supply device 20. Before starting printing, the ink supply amount calculation unit 11 receives input of material information such as ink type and paper type, printing conditions such as image ratio information, and past ink supply amount information. The image ratio information can be obtained from CIP4 data for plate making. Past ink supply information is read from the database 17. In the database 17, the correspondence between the ink supply amount when the print color matches the target color in the past printing and the printing condition at that time is recorded. The ink supply amount calculation unit 11 calculates an initial ink supply amount (ink preset amount) corresponding to the current printing condition from these pieces of information, and inputs the calculated initial ink supply amount to the operation control unit 12. The driving operation control unit 12 sets a preset value of a predetermined parameter (here, an ink key opening degree) for determining the ink supply amount in the ink supply device 20 based on the input calculated value of the ink preset amount. The method of setting the preset value that can be adopted here is not limited, and various methods such as the method disclosed in JP-A-8-1914 can be used.
[0022]
After the start of printing, the ink supply amount calculator 11 receives print color data obtained by measuring the actual printed matter 18 with a measuring device 50 such as a spectrometer. The ink supply amount calculation unit 11 compares the target color data of the sample print with the print color data, calculates a feedback correction amount of the ink supply amount for bringing the print color closer to the target color, and inputs the correction amount to the operation control unit 12. I do. The target color data may be obtained by measuring the sample printing in advance by the measuring device 50 or may be obtained from CIP4 data for plate making. The driving operation control unit 12 corrects the set value of the ink key opening based on the input calculation value of the ink supply amount. There is no limitation on the ink supply amount feedback method that can be adopted here, and various methods such as the method disclosed in Japanese Patent Application Laid-Open No. 8-132595 can be used.
[0023]
The driving operation control unit 12 comprehensively controls the rotation control unit 13, the ink increasing / decreasing unit 14, the cylinder insertion control unit 15, and the swing control unit 16. The rotation control unit 13 controls the rotation state of the drive motor 46, and the ink increasing / decreasing unit 14 controls the ink supply device 20 (or the ink supply device 20 or the ink scraping device 48 when the ink scraping device 48 is provided). , The ink insertion control unit 15 controls the insertion mechanism 42 to attach and detach the printing cylinder 40, and the swing control unit 16 controls the swing state of the swing roller 32.
[0024]
The set value of the ink key opening set by the operation control unit 12 based on the ink supply amount calculated by the ink supply amount calculation unit 11 is input to the ink increasing / decreasing unit 14. The ink increasing / decreasing unit 14 adjusts the opening of the ink key by moving the ink key 24 according to the input set value. At this time, the ink increasing / decreasing unit 14 increases the ink key opening when increasing the ink supply amount, and decreases the ink key opening when decreasing the ink supply amount. When the ink scraping device 48 is provided, the ink scraping device 48 is turned on to scrape and consume excess ink.
[0025]
Hereinafter, the contents of the operation control of the printing press performed by the control device 10 will be described with reference to the flowcharts of FIGS. 2, 3, and 4.
FIG. 2 is a flowchart showing the procedure of operation control at the start of printing. First, in a first step, the ink supply amount calculation unit 11 of the control device 10 calculates material information such as ink type and paper type, image streak ratio information, and past ink supply amount information necessary for calculating the ink preset amount. Obtain (step A10). The ink supply amount calculation unit 11 calculates an ink preset amount from these pieces of information, and the operation control unit 12 sets a preset value of the ink key opening based on the calculated ink preset amount, and controls the ink increasing / decreasing unit 14. The ink key opening is set to a preset value via the control unit (step A20).
[0026]
Next, the operation control unit 12 controls the press-in mechanism 42 via the press-in control unit 15 to pull out the printing cylinder 40 (solid line position in FIG. 1). Subsequently, the drive motor 46 is controlled via the rotation control unit 13 to rotate the ink roller group 30 including the plate cylinder 36 at a high speed at the same speed as when printing, so that an amount of ink corresponding to the preset value is supplied to the ink supply device 20. To supply the ink to the ink roller group 30 to make the ink permeate the ink roller group 30 (step A30). Eventually, the ink in the ink roller group 30 reaches an equilibrium state, but the equilibrium state of the ink is different between the high-speed rotation and the low-speed rotation. An ink equilibrium state can be formed.
[0027]
When the equilibrium state of the ink is formed in the ink roller group 30, the operation control unit 12 controls the loading mechanism 42 via the loading control unit 15, and drives the printing cylinder 40 at the same high speed as during printing. The cylinder is inserted while spinning (the position indicated by the two-dot chain line in FIG. 1). Then, printing (test printing) is performed on a predetermined number of printing papers (step A40). By removing the printing cylinder 40 until the ink is in the equilibrium state, printing is not performed while the ink is in the equilibrium state, and the occurrence of waste paper can be prevented. In addition, by inserting the printing cylinder 40 while rotating it at a high speed, printing can be started while maintaining an ink equilibrium state close to the time of printing, and the time until the printing color is stabilized is shortened, and Can be reduced.
[0028]
After printing the predetermined number of sheets, the operation control unit 12 controls the insertion mechanism 42 via the insertion control unit 15 to unload the printing cylinder 40 (step A50). The operator measures the printing color of the printed material 18 obtained by printing with the measuring device 50 (step A60). The ink supply amount calculation unit 11 takes in the printing color data of the printed matter 16 from the measuring device 50 and compares it with the previously acquired target color data (step A70).
[0029]
As a result of the comparison, if the print color of the printed matter 18 does not match the target color, that is, if the color tone difference between the print color and the target color is out of the allowable range, the process returns to step A20 and the ink supply amount calculation unit 11 Calculates the correction amount of the supplied ink according to the color tone difference, and the operation control unit 12 corrects the set value of the ink key opening based on the calculated correction amount, and the ink key opening via the ink increasing / decreasing unit 14. Is set to the correction value.
[0030]
Next, the operation proceeds to step A30, in which the operation control unit 12 controls the drive motor 46 via the rotation control unit 13 while keeping the printing cylinder 40 in the cylinder-extracted state, and prints the ink roller group 30 including the plate cylinder 36. The ink is rotated at a high speed at the same speed as that at the time, and an amount of ink corresponding to the corrected ink key opening is supplied from the ink supply device 20 to the ink roller group 30. Until the ink equilibrium state with the corrected ink supply amount fed back as described above is formed, the ink roller group 30 is rotated at a high speed with the printing cylinder 40 pulled out to form an ink equilibrium state close to the time of printing. can do.
[0031]
Eventually, when the equilibrium state of the ink in the ink roller group 30 is corrected to the equilibrium state corresponding to the corrected ink key opening, the operation control unit 12 controls the loading mechanism 42 via the loading control unit 15. Then, the printing cylinder 40 is inserted while rotating at the same high speed as during printing. Then, test printing is performed again on a predetermined number of print sheets (step A40).
[0032]
Thereafter, the processing is performed according to the procedures of steps A50, A60, and A70, and from step A20 until the print color of the printed matter 18 matches the target color, that is, until the color tone difference between the print color and the target color falls within the allowable range. The processing up to step A70 is repeatedly executed. If the color tone difference between the print color and the target color falls within the allowable range in the determination in step A70, the driving operation control unit 12 controls the press-in mechanism 42 via the press-in control unit 15. The printing cylinder 40 is inserted while rotating at the same high speed as during printing. Then, the printing paper is continuously supplied, and the actual printing is performed (step A80).
[0033]
By performing the operation control at the start of printing in such a procedure, the number of waste sheets generated at the start of printing can be significantly reduced. As a result of an actual test, it was found that about 70 to 100 sheets of waste paper which had been generated in the conventional simple feedback control could be reduced to about 25 sheets by performing the operation control in the above procedure. Although not shown in the flowchart, when the print color of the printed material 18 matches the target color, it is preferable to record the ink supply amount at that time in the database 17 in association with the current printing condition. By accumulating / updating the data in the database 17 in this manner, the accuracy of the preset can be improved, and the occurrence of waste paper can be expected to be further suppressed.
[0034]
The operation control at the start of printing that can be executed by the control device 10 is not limited to the procedure shown in the flowchart of FIG. The control device 10 can also execute the operation control at the start of printing according to the procedure shown in the flowchart of FIG. The difference from the procedure shown in the flowchart of FIG. 2 is that the process of step A50 of removing the printing cylinder 40 after the test printing in step A40 is eliminated, and instead, after the determination in step A70, the printing color is changed to the target color. The process of step A90 of removing the printing cylinder 40 when the value does not match with the above is provided. According to such a procedure, when the print color of the printed material 18 matches the target color, it is not necessary to insert the printing cylinder 40 again in step A80, and the process can immediately proceed to the main printing. Will be possible. On the other hand, according to the procedure shown in the flowchart of FIG. 2 described above, although it is necessary to insert the printing cylinder 40 in step A80, if the printing color does not match the target color, By immediately removing the printing cylinder 40 at A50, the occurrence of waste paper can be minimized.
[0035]
FIG. 4 is a flowchart showing the procedure of the operation control at the end of printing. First, in the first step, after the number of sheets to be printed is completed, the operation control unit 12 of the control device 10 closes the ink key 14 via the ink increasing / decreasing unit 14 or turns off the swing of the call roller 28 to supply ink. The ink supply from the device 20 to the ink roller group 30 is stopped (step B10). Subsequently, the driving operation control unit 12 controls the insertion mechanism 42 via the insertion control unit 15 to remove the printing cylinder 40 (step B20). By stopping the ink supply and removing the printing cylinder 40 in this manner, the number of waste sheets at the end of printing is reduced. Note that the processing of step B10 and the processing of step B20 may be performed in a reverse order, or may be performed in parallel.
[0036]
Next, the operation control unit 12 controls the drive motor 46 via the rotation control unit 13 to rotate the ink roller group 30 including the plate cylinder 36 at the same speed as that during printing, while controlling the swing control unit 16. The oscillating roller 32 is driven in the axial direction via (step B30). By such processing, the axial distribution of ink in the ink roller group 30 is equalized, and printing can be started immediately in the next job.
[0037]
In addition, the ink supply amount calculation unit 11 of the control device 10 compares the current ink mass in the ink roller group 30 with the ink mass in the ink roller group 30 required for the next job (step B40). If the amount of ink mass required in the next job is larger, it can be dealt with by supplying ink according to the ink mass difference at the time of presetting in the next job. On the other hand, if the amount of ink mass required for the next job is smaller, printing is performed again to reduce abrasion, or if an ink scraping device 48 is provided, this is turned on to scrape excess ink. Perform the taking. Even in the case of abrasion, the operation control unit 12 controls the insertion mechanism 42 via the insertion control unit 15 and inserts the printing cylinder 40 while idling at high speed. Then, printing is performed on a number of sheets of printing paper corresponding to the difference in the ink mass, and the amount of ink mass in the ink roller group 30 is reduced, thereby reducing waste paper (step S50). By such processing, it is possible to adjust the ink mass balance in the ink roller group 30 while minimizing the number of waste sheets, and printing can be started more quickly in the next job. Note that the processing of steps B40 and B50 may be performed in a reverse order to the processing of steps B10 to B30. Alternatively, after the processing of steps B10 and B20, the processing of steps B40 and B50 may be performed in parallel with the processing of step B30.
[0038]
As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and can be variously modified and implemented without departing from the gist of the present invention. For example, in the embodiment, a printing machine equipped with an ink key type ink supply device is described as an example, but the present invention can also be applied to a printing machine equipped with another type of ink supply device such as an ink rail type. .
[0039]
【The invention's effect】
As described above in detail, according to the method of operating a printing press at the start of printing according to the present invention, the ink roller group including the plate cylinder is rotated at a high speed by adjusting the equilibrium state of the ink in the ink roller group. By forming while rotating and printing by inserting the printing cylinder while the ink roller group is rotated at a high speed, the number of waste sheets generated at the start of printing can be further reduced.
[0040]
According to the method of operating a printing press at the end of printing according to the present invention, printing is performed by stopping the ink supply and removing the printing cylinder, and driving the swing roller while rotating the ink roller group at a high speed. The number of waste sheets at the end can be reduced, and printing can be started immediately in the next job by equalizing the axial distribution of ink.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating a configuration of a printing unit of a printing press and a control system thereof according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating an example of a procedure of operation control at the start of printing by the control device of FIG. 1;
FIG. 3 is a flowchart showing a modified example of the operation control procedure shown in FIG.
FIG. 4 is a flowchart showing a procedure of operation control at the end of printing by the control device of FIG. 1;
[Explanation of symbols]
10 Control device
11 Ink supply amount calculation unit
12 Operation control unit
13 Rotation control unit
14 Ink increase / decrease section
15 Body control unit
16 Swing control unit
17 Database
18 Printed matter
20 Ink supply device
22 Ink fountain
24 Ink key
26 Ink base roller
28 Call Roller
30 Ink roller group
32 swing roller
34 Ink delivery roller
36 plate cylinder
40 printing cylinder
42 Body insertion mechanism
44 impression cylinder
46 Drive motor
48 Ink scraping device
50 Measuring device

Claims (6)

A method of operating the printing press at the start of printing,
An initial setting step of setting a supply amount of ink supplied from the ink supply device or a parameter correlated to the ink supply amount based on predetermined printing conditions that affect a print color;
In a state where the printing cylinder is removed, while rotating the ink roller group including the plate cylinder at a high speed, an amount of ink corresponding to the set value in the initial setting step is supplied from the ink supply device to the ink roller group. An ink equilibrium forming step of forming an equilibrium state of the ink in the ink roller group;
After forming the ink equilibrium state, a cylinder inserting step of inserting the printing cylinder while rotating the ink roller group at a high speed,
After inserting the printing cylinder, a trial printing step of trial printing through printing paper,
A comparison step of comparing the print color of the printed matter obtained in the test printing with the target color,
A cylinder removing step of removing the printing cylinder,
A feedback step of correcting a parameter correlated with an ink supply amount or an ink supply amount supplied from the ink supply device based on a comparison result in the comparison step;
While the printing cylinder is in an uncut state, while rotating the ink roller group at a high speed, an amount of ink corresponding to the correction value in the feedback step is supplied from the ink supply device to the ink roller group. An ink equilibrium correcting step of correcting the equilibrium state of the ink in the printing press. A method of operating the printing press at the start of printing,
A trial printing process for trial printing through printing paper;
A comparison step of comparing the print color of the printed matter obtained in the test printing with the target color,
A blanking process for blanking the printing cylinder;
A feedback step of correcting a parameter correlated with an ink supply amount or an ink supply amount to be supplied from the ink supply device based on the comparison result in the comparison step;
While the printing cylinder is in an uncut state, while rotating the ink roller group at a high speed, an amount of ink corresponding to the correction value in the feedback step is supplied from the ink supply device to the ink roller group. An ink equilibrium correction process for correcting the equilibrium state of the ink in the ink;
And a cylinder inserting step of inserting the printing cylinder while the ink roller group is being rotated at a high speed. The method according to claim 1, wherein the cylinder removing step is performed prior to the comparison step. 3. The method according to claim 1, wherein the cylinder removing step is performed after the comparing step. A method of operating the printing press at the end of printing,
An ink supply stopping step of stopping ink supply from the ink supply device to the ink roller group including the plate cylinder;
A blanking process for blanking the printing cylinder;
An equalizing process of driving the oscillating roller included in the ink roller group and oscillating in the axial direction while rotating the ink roller group at a high speed to equalize the axial distribution of ink in the ink roller group; And a method for operating a printing press. An ink mass difference calculating step of calculating an ink mass difference between the current ink mass amount in the ink roller group and the ink mass amount in the ink roller group required in the next job;
The printing cylinder is inserted while the ink roller group is rotated at a high speed, and an ink mass adjusting step of reducing the amount of ink mass in the ink roller group by printing a number of papers according to the ink mass difference is further performed. The method for operating a printing press according to claim 5, wherein:

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