JP6948051B2 - Defect analysis method on the printed surface and adjustment method of the printing device based on the defect analysis method, and defect analysis system on the printed surface and the adjustment system of the printing device having the defect analysis system. - Google Patents

Description

The present invention relates to a method and a system for analyzing defects on the printed surface of a workpiece printed by a printing apparatus, and a method and a system for adjusting the printing apparatus using the same.

Conventionally, a defect and its position are detected by an inspection device for a printed work, and a mark is added to the position or information on the position is stored, and the work wound up after printing of the lot is completed. The defect is inspected in the process of rewinding the roll into another roll, and if the defect is determined to be defective, the portion is cut and pasted and excised (for example, Patent Document 1 and the like). Then, at the time of this inspection, the operator visually analyzes the defect using a loupe or the like, and adjusts the ink density, printing pressure, etc. of the printing device as necessary based on the analysis result and the operator's experience. Is being done.

Japanese Unexamined Patent Publication No. 2014-71067

However, in the conventional method of adjusting the printing apparatus by analyzing the defects at the time of inspection, many similar printing defects occur in the lot and other workpieces between the occurrence of the defects and the adjustment of the printing apparatus. Increased inspection work and many defective processes were unavoidable, which was one of the reasons why production efficiency could not be improved.

Further, since the inspection device is for judging the quality of the printed surface, it is performed when the ink is completely fixed and the printed surface is completed as a product. Furthermore, since the inspection (and analysis) of this defect is performed when the work is wound and then rewound, is the cause of the ink bleeding during the analysis, for example, the ink viscosity? It is not possible to accurately determine whether it is in the printing pressure, in the drying process, or in the rewinding process. Therefore, the adjustment of the printing apparatus based on such an analysis is largely based on the past experience of the operator, and it is difficult to adjust the printing apparatus quickly and accurately.

Therefore, in view of the above-mentioned situation, the present invention attempts to solve the problem of a printing surface defect analysis method capable of quickly and accurately adjusting the printing apparatus before many defects occur, a printing apparatus adjusting method, and the like. And to provide these systems.

As a result of diligent studies in view of the current situation, the present inventor, unlike defects caused by dust and dirt, defects caused by various misalignments of the printing apparatus tend to occur continuously at the same position once they occur. Focusing on this experience, instead of analyzing the defects themselves detected by the inspection device, the same position on the printed surface to be printed after that is imaged and analyzed at a position closer to the printing device on the upstream side than the inspection device. By doing so, it has been found that the cause of the defect can be more accurately grasped during printing, and the present invention has been completed.

That is, the present invention includes the following inventions.
(1) A first imaging means for imaging the printed surface of the work printed by the printing apparatus, and a second imaging means for imaging the printed surface of the workpiece printed by the printing apparatus, wherein the first imaging means is used. A second image pickup means, which is provided at a position on the upstream side closer to the printing apparatus than the first image pickup means and takes a more detailed image with a higher resolution than the first image pickup means, is provided by a computer. The second imaging means is operated based on the procedure of comparing the image information of the printed surface obtained by the imaging means with the reference image information and identifying the defect and its position and the position information of the defect, and the above-mentioned For defect analysis, a procedure for capturing a detailed image of a region corresponding to the position of the defect on the print surface of the work printed after the print surface and detailed image information of the region captured by the second imaging means are used for defect analysis. A method for analyzing defects on a printed surface, which comprises a procedure for storing information.

(2) The second imaging means is an imaging means that images an imaging region narrower than that of the first imaging means, and the second imaging means is moved along a direction intersecting the flow direction of the work. Before the computer operates the second imaging means, the moving means is provided so that the second imaging means is moved to a coordinate position in the work width direction corresponding to the position information based on the position information of the defect. (1) The method for analyzing defects on a printed surface, which comprises a procedure for moving.

(3) A drying device for fixing the printed surface to the work is provided on the downstream side of the printing device, the first imaging means is provided at a position downstream of the drying device, and the second imaging is performed. The method for analyzing defects on a printed surface according to (1) or (2), wherein the means is provided at a position between the drying device and the printing device.

(4) The procedure for analyzing the defect based on the information for defect analysis on the printed surface stored by the computer by the defect analysis method according to any one of (1) to (3), and the procedure based on the analysis result. A method for adjusting a printing device, which comprises a procedure for controlling a predetermined adjusting mechanism provided in the printing device.

(5) The computer further operates the second imaging means, controls the adjusting mechanism, and then re-images a region corresponding to the position of the defect on the printed surface of the printed workpiece in detail, and performs the imaging. The adjustment method for a printing apparatus according to (4), wherein the detailed image information is analyzed and feedback control is performed on the predetermined adjustment mechanism based on the analysis result.

(6) The computer analyzes the image information obtained by the first imaging means on the printed surface of the work printed after controlling the adjusting mechanism, and feeds back the predetermined adjusting mechanism based on the analysis result. The method for adjusting a printing device according to (4) or (5) to be controlled.

(7) The method for adjusting a printing device according to any one of (4) to (6), wherein the adjustment mechanism is at least one of a misregistration adjustment mechanism, a plate pressure adjustment mechanism, and an ink adjustment mechanism.

(8) A first imaging means for imaging the printed surface of the work printed by the printing apparatus, and a second imaging means for imaging the printed surface of the workpiece printed by the printing apparatus, wherein the first imaging means is used. The second imaging means, which is provided at a position on the upstream side closer to the printing apparatus than the first imaging means and performs more detailed imaging with higher resolution than the first imaging means, and the first imaging means can be obtained. A defect identification processing unit that identifies defects and their positions by comparing image information on the printed surface with reference image information, and the second imaging means is operated based on the position information of the defects from the printed surface. The image processing unit that captures a detailed image of the region corresponding to the position of the defect on the printing surface of the work printed later, and the detailed image information of the region imaged by the second imaging means are used as information for defect analysis. A defect analysis system for a printed surface, which comprises a computer having a storage processing unit for storing.

(9) The second imaging means is an imaging means that images an imaging region narrower than that of the first imaging means, and the second imaging means is moved along a direction intersecting the flow direction of the work. A movement processing unit comprising a moving means for causing the computer to operate the moving means based on the position information of the defect and moving the second imaging means to a coordinate position in the work width direction corresponding to the position information. The defect analysis system for the printed surface according to (8).

(10) A drying device for fixing the printed surface to the work is provided on the downstream side of the printing device, and the first imaging means is provided at a position downstream of the drying device. 2. The defect analysis system for a printed surface according to (8) or (9), wherein the imaging means of 2 is provided at a position between the drying device and the printing device.

(11) Defect analysis having the printing surface defect analysis system according to any one of (8) to (10), and the computer analyzing the defects based on the stored information for defect analysis of the printed surface. An adjustment system for a printing device having a processing unit and an adjustment processing unit that controls a predetermined adjustment mechanism provided in the printing device based on the analysis result.

(12) A re-imaging process in which the computer further operates the second imaging means to control the adjusting mechanism and then re-imaging in detail a region corresponding to the position of the defect on the printed surface of the printed workpiece. A unit and a reanalysis processing unit that analyzes detailed image information captured by the reimaging processing unit are provided, and the adjustment processing unit feedback-controls the predetermined adjustment mechanism based on the result of the reanalysis. (11) The adjustment system for the printing apparatus according to the above.

(13) The computer includes a second analysis processing unit that analyzes image information obtained by the first imaging means on the print surface of the work printed after controlling the adjustment mechanism, and the adjustment processing unit includes the adjustment processing unit. , The adjustment system of the printing apparatus according to (11) or (12), which feedback-controls the predetermined adjustment mechanism based on the result of this analysis.

(14) The adjustment system for a printing apparatus according to any one of (11) to (13), wherein the adjustment mechanism is at least one of a misregistration adjustment mechanism, a plate pressure adjustment mechanism, and an ink adjustment mechanism.

According to the present invention as described above, after the defect and its position are identified by using the first imaging means as in the conventional inspection apparatus, the defect itself is not the defect itself, but the printed surface to be printed thereafter. Since the region corresponding to the position of the defect is imaged in more detail by the second imaging means and the position is analyzed, it is possible to analyze during printing, and many of the same printing defects occur, leading to defects. It is possible to avoid such a situation by adjusting the printing apparatus before, and to significantly improve the production efficiency.

Further, the analysis is not performed on the defect itself extracted by inspecting the printed surface completed as a product as in the conventional case, but corresponds to the position of the defect at a position closer to the printing device on the upstream side than the inspection device. Since a detailed image of the area to be printed is acquired and analyzed, it is possible to analyze the area before it is affected by drying or rewinding of the ink, and it is possible to more accurately determine the cause of the defect. It becomes. Therefore, it is possible to more accurately adjust the adjustment of the printing apparatus based on such an analysis. Such a second imaging means can also be used for registering before inspection / analysis, analysis of contact pressure, and adjustment, which makes it possible to shorten the printing time.

Further, the second imaging means is an imaging means that images an imaging region narrower than that of the first imaging means, and the second imaging means is moved along a direction intersecting the flow direction of the work. The moving means is provided, and before the computer operates the second imaging means, the second imaging means is moved to a coordinate position in the work width direction corresponding to the position information based on the position information of the defect. By providing the procedure for making the image, the second imaging means that originally needs to image only the region corresponding to the defect is set to the minimum necessary imaging region, and the expensive second imaging means having high resolution is efficiently used. This makes it possible to reduce costs.

Further, a drying device for fixing the printed surface to the work is provided on the downstream side of the printing device, the first imaging means is provided at a position downstream of the drying device, and the second imaging means is provided. Is provided at a position between the drying device and the printing device, so that it is possible to analyze the defect handling position in the state before the influence of drying occurs, and more accurately analyze and adjust the printing device.

Further, when the computer controls a predetermined adjustment mechanism provided in the printing device based on the analysis result, the defect on the printed surface of the workpiece printed after the second imaging means is further operated and the adjustment mechanism is controlled. By performing detailed imaging of the region corresponding to the position of the above, analyzing the captured detailed image information, and feedback-controlling the predetermined adjustment mechanism based on the analysis result, more accurate adjustment becomes possible. Print quality can be improved quickly.

Similarly, when the computer controls the adjustment mechanism, the image information obtained by the first imaging means of the printed surface of the work printed after controlling the adjustment mechanism is analyzed, and based on the analysis result, the predetermined image information is obtained. By feedback-controlling the adjustment mechanism, a product having a higher quality printed surface can be quickly obtained.

The explanatory view which shows the structure of the defect analysis system which concerns on the typical embodiment of this invention, and the adjustment system of the printing apparatus which comprises this. The explanatory view which shows the structure of the computer which also has the defect analysis system and the adjustment system of a printing apparatus. The explanatory view which shows the 1st imaging means which also has a defect analysis system and the adjustment system of a printing apparatus. (A) and (b) are explanatory views which show the 2nd imaging means and the moving means which the defect analysis system and the adjustment system of a printing apparatus also have. Similarly, a flow chart showing a processing procedure of a defect analysis system. The flow chart which also shows the processing procedure of the adjustment system.

Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, the defect analysis system S1 on the printed surface according to the present invention will be described, and then the adjustment system S2 of the printing apparatus including the defect analysis system S1 will be described.

As shown in FIG. 1, the printing surface defect analysis system S1 according to the present invention is the same as the first imaging means 11 that images the printing surface 10 of the work W printed by the printing apparatus 1 (1A to 1D). A second imaging means 12 for imaging the printing surface 10 of the work W printed by the printing device 1, which is provided at a position on the upstream side closer to the printing device 1 than the first imaging means 11. It includes a second imaging means 12 that captures images in more detail with a higher resolution than the first imaging means 11, and a computer 5.

When the defect and its position are specified from the image information of the printed surface obtained by the first imaging means 11 on the downstream side, the defect analysis system S1 of the printed surface of the present invention is printed after the printed surface in which the defect is identified. This is a system in which the region 9 corresponding to the position of the defect on the printed surface is imaged in more detail by the second imaging means 12 and the defect is analyzed. As a result, it is possible to analyze defects during printing, and it is possible to analyze in a state before the effects of ink drying and rewinding occur, and the cause of defects can be determined more accurately. Is. The work W exemplifies a method of printing the same type of printing on continuous strip-shaped sheets, but the present invention is also applied to a method of printing on cut sheets instead of continuous sheets. Applicable. In addition to paper, various sheets such as synthetic resin film and aluminum foil are included in the target.

As described above, although the present invention is called "defect analysis", it does not analyze the defect itself detected by the inspection (first imaging means 11), but analyzes the region at the same position printed thereafter. By analyzing such a region 9, it is possible to analyze a defect caused by a purely misalignment of the printing device, which is not affected by other things at a position closer to the printing device than the inspection position. .. Therefore, when the defect is detected by the first imaging means 11, the region 9 corresponding to the position is analyzed by the second imaging means 12 without delay, and the printing apparatus is adjusted based on the analysis, so that the defect can be quickly performed. Can be eliminated, and the degree of defects can be dealt with before they become defective, so that production efficiency and quality can be significantly improved.

Similar to the imaging means used in the conventional inspection device, the first imaging means 11 is provided with a plurality of imaging cameras 2 in the work width direction, for example, as shown in FIG. 3, and images an area over the entire width of the work. A line sensor camera in which a plurality of CCD or CMOS image sensors are arranged side by side in the horizontal direction orthogonal to the transport direction may be used. The number and arrangement of the cameras are not particularly limited as long as they can image the work W, and in addition to the line sensor cameras, one or a plurality of area sensor cameras in which a plurality of CCD or CMOS image sensors are arranged side by side in the vertical and horizontal directions may be provided. good. An illumination means (not shown) that illuminates the work with almost uniform illuminance over the entire width in the horizontal direction is also provided for imaging, and a plurality of lamps are arranged in a row in the horizontal direction or a straight lamp that is long in the horizontal direction. Those provided with a tubular lamp are also preferable.

On the other hand, since the purpose of the second imaging means 12 is to image the pinpoint region 9 corresponding to the position of the defect as described above, for example, as shown in FIGS. A single imaging camera 3 that captures an imaging region narrower than the imaging means 11 of the above, and further, the imaging camera 3 is used as a moving means 4 for moving the imaging camera 3 along a direction intersecting the flow direction of the work W. A traverse mechanism 40 (4) is provided to support and move the crossing direction, in this example, the work width direction.

For the image pickup camera 3, for example, a 2 million pixel full high-definition camera equipped with an optical zoom having a resolution of 0.1 mm / pixel −0.016 mm / pixel, and in some cases 12.5 μm / pixel-2 μm / pixel is used, and the first image pickup is performed. Like the means 11, the lighting means is also provided. As described above, in this example, by providing the moving means 4 for moving the relatively expensive single imaging camera 3 having high resolution in the direction intersecting the flow direction, the region 9 corresponding to the defect position can be efficiently set. It is configured so that it can be imaged in detail.

Of course, as with the first imaging means 11, a plurality of imaging cameras 3 may be provided in the work width direction so that a region covering the entire width of the work can be imaged in detail. In this case, the captured image used for the analysis is a region corresponding to the position of the defect.

Although the printing apparatus 1 shows an example of a center drum type flexographic printing machine, it can be applied to various printing methods such as gravure printing, high-speed offset rotary printing, and digital printing in addition to flexographic printing. In this example, the printing device 1 is composed of four printing devices 1A to 1D for printing four kinds of color inks, and is dried to fix the printing surface 10 on the work W on the downstream side of the printing device 1. A device 6 is provided. The first imaging means 11 is provided at a position downstream of the drying device 6, and the second imaging means 12 is located between the drying device 6 and the printing device 1 located upstream of the drying device 6. It is provided at the position of.

It is also preferable to provide the second imaging means for each of the printing devices 1A to 1D at a downstream position, that is, between the printing devices 1A and 1B, between 1B and 1C, between 1C and 1D, and on the downstream side of 1D. Is. According to this, it is possible to image and analyze each color as a region corresponding to the position of the defect, and more accurate analysis and adjustment become possible. In this case, all four second imaging means will image the same corresponding position. Further, in the case of printing while drying one color at a time, by providing a second imaging means on the downstream side of the printing device for each color and at the upstream position of the drying device, accurate analysis that is not affected by drying is possible. It becomes.

The computer 5 includes a processing device 7 and a storage means 8. The processing device 7 is mainly composed of a CPU such as a microprocessor, and adjusts the first imaging means 11, the second imaging means 12, the moving means 4, and the printing devices 1A to 1B through the input / output unit and the bus line. Various information is sent and received to and from the mechanism. The storage means 8 is composed of storage memories such as RAMs and ROMs inside and outside the processing device 7, a hard disk, and the like, and stores programs and processing data that define procedures for various processing operations in the processing device 7.

As shown in FIG. 2, the storage means 8 stores the master image storage unit 8a that stores image data as a reference when detecting a defect, and the image data of the printed surface captured by the first imaging means 11. Image-captured image storage unit 8b, defect image storage unit 8c for storing the image data of the detected defect, defect position information storage unit 8d for storing the position information of the defect, and the second imaging means 12. It is provided with at least a detailed image information storage unit 8e for storing the detailed image data of the region 9.

Functionally, as shown in FIG. 2, the processing device 7 identifies the defect and its position by comparing the image information of the print surface 10 obtained by the first imaging means 11 with the reference image information. The defect identification processing unit 7a, the movement processing unit 7b that operates the moving means 4 based on the position information of the defect, and moves the second imaging means 12 to the coordinate position in the work width direction corresponding to the position information, and the above. With the imaging processing unit 7c, the second imaging means 12 is operated based on the defect position information to image the region 9 corresponding to the defect position on the printing surface of the work printed after the printing surface in more detail. A storage processing unit 7d that stores detailed image information of the region 9 captured by the second imaging means 12 as information for defect analysis is provided at least, and these functions are realized by the above program.

The defect identification processing unit 7a compares the image captured by the first imaging means 11 with the master image as a pass criterion, detects the defect portion 70, and the work W of the detected defect portion. It is composed of a position specifying processing unit 71 for specifying an upper position.

The defect detection processing unit 70 compares the image captured by the first imaging means 11 with the master image of the master image storage unit 8a, and when the difference between the comparison values of the density levels exceeds a preset allowable range. In addition, a portion exceeding the permissible range is detected as a defective portion. The master image stored in the master image storage unit 8a is a multi-gradation area image having a density level of 256 gradations or more like the captured image, and the multi-gradation area image and the master image of the image to be inspected by the comparison means. The difference in density level of each part can be obtained by comparing with the multi-gradation area image of. Then, the detected defect image is stored in the defect image storage unit 8c.

The position identification processing unit 71 counts a part of marks and patterns provided at regular intervals in the longitudinal direction of the sheet, and identifies the positions (coordinates) in the longitudinal direction and the width direction of the defective portion based on the marks and patterns. Can be done. In addition, the position in the longitudinal direction can be determined by counting the pulse signals emitted from the pulse generator every time the take-up sheet travels a certain distance. The position information of the identified defect is stored in the defect position information storage unit 8d.

The movement processing unit 7b operates the moving means 4 based on the position information of the defect position information storage unit 8d. Further, the image pickup processing unit 7c operates the second image pickup means 12 so as to image the region 9 corresponding to the defect position based on the position information of the defect position information storage unit 8d. Then, the detailed image information captured by the second imaging means 12 is stored in the detailed image information storage unit 8e as information for defect analysis by the storage processing unit 7d.

In the actual analysis, the processing device 7 is provided with a display processing unit that displays the detailed image information stored in the detailed image information storage unit 8e on a display (not shown), or the processing device is provided with a processing device such as an adjustment system described later. It is preferable to provide an analysis processing unit for automatic analysis.

The processing procedure of the above defect analysis system S1 will be described with reference to FIG.

The defect detection processing unit 70 of the defect identification processing unit 7a sequentially stores the image information of the printed surface obtained by the first imaging means 11 in the image capturing image storage unit 8b (S101), and also serves as a reference of the master image storage unit 8a. (S102). As a result of comparison, when a defect is detected (S103), the position identification processing unit 71 acquires the position information of the defect (S104), and the image and the position information of the defect are transferred to the captured image storage unit 8b and the defect image storage unit 8c, respectively. It is stored (S105).

Then, based on the position information of the defect, the movement processing unit 7b operates the moving means 4 to move the second imaging means 12 to the coordinate position in the work width direction corresponding to the position information of the defect (S106). Next, the image pickup processing unit 7c operates the second imaging means 12 based on the position information of the defect, and causes the region 9 corresponding to the position of the defect to be imaged in detail at the same timing (S107).

Next, the detailed image storage processing unit 7d stores the detailed image information of the region 9 imaged by the second imaging means 12 in the detailed image information storage unit 8e (S108). This stored detailed image information is then used as information for defect analysis. As described above, the usage pattern may be determined by the operator by displaying the image, or it is preferable that the processing device of the computer is provided with a processing unit for automatic analysis. In any case, dot-by-dot analysis is possible based on a detailed image, and it is also possible to judge the quality of the density, viscosity, etc. from the state of ink on the ink immediately after printing.

Next, the adjustment system S2 of the printing apparatus including the defect analysis system S1 will be described.

As shown in FIGS. 1 and 2, the adjustment system S2 further functionally analyzes (accurately) the defects by the processing device 7 of the computer 5 based on the stored information for defect analysis on the printed surface. Has a defect analysis processing unit 7e that analyzes the corresponding area of the printed surface printed after the defect, and a predetermined adjustment mechanism (13A to 13D) provided in the printing apparatus 1 (1A to 1D) based on the analysis result. ) Is provided, the storage means 8 further includes an analysis result storage unit 8f and an adjustment data storage unit 8g, and the computer 5 performs analysis to perform the printing device 1 (adjustment mechanism). It is controlled automatically. As a result, it is possible to perform analysis and adjustment during printing without stopping the printing apparatus 1 and reduce the occurrence of defects in the lot.

The computer 5 adjusts the predetermined adjustment mechanisms (13A to 13D) of the printing apparatus by the adjustment processing unit 7f, and then further operates the second imaging means 12, and the computer 5 further operates the second imaging means 12 to perform the adjustment on the printing surface of the work to be printed after the adjustment. A reimaging processing unit 7g for re-imaging the region 9 corresponding to the position of the defect and a re-analyzing processing unit 7h for further analyzing the detailed image information captured by the reimaging processing unit are provided for adjustment. The processing unit 7f is configured to feedback-control a predetermined adjustment mechanism (13A to 13D) based on the result of this reanalysis.

Further, in this example, the computer 5 analyzes the image information obtained by the first imaging means 11 on the printed surface printed after adjusting the adjusting mechanisms 13A to 13D of the printing apparatus by the adjusting processing unit 7f. The analysis processing unit 7i is provided, and the adjustment processing unit 7f is configured to further feedback control the predetermined adjustment mechanisms (13A to 13D) based on the result of this analysis. With this configuration, it is possible to control the printing apparatus so that the printed surface has higher quality.

Regarding these two types of feedback control of the adjustment processing unit 7f, only one of them may be used, or both of them may be omitted. Further, as for the feedback control of both, as in this example, the feedback control based on the reanalysis processing unit 7h may be performed first, and then the feedback control based on the second analysis processing unit 7i may be performed, or both may be performed simultaneously. Feedback control may be performed, or may be performed in combination as appropriate.

The adjustment mechanism (13A to 13D) of each printing device can be a misregistration adjustment mechanism, a plate pressure adjustment mechanism, an ink adjustment mechanism, or other mechanism. Conventionally, ink adjustment is performed by, for example, an operator adding water to change the viscosity, but this can also be automated as appropriate, such as by providing a device for automatically adding a set amount of water or ink stock solution. can. As described above, according to the present invention, the automation of the printing apparatus 1 can be promoted, so that the control of the entire printing system including the adjustment of the printing apparatus can be completely unmanned in the closed system.

The processing procedure of the above adjustment system S2 will be described with reference to FIG.

First, the defect analysis processing unit 7e performs analysis based on the detailed image of the detailed image information storage unit 8e based on a predetermined program determined in advance (S201), and stores the analysis result storage unit 8f (S202). The content of the analysis is, for example, comparing the state of ink in dot units with the normal state, and numerically grasping how much the shape, density, etc. deviate from the predetermined normal values. Misregistration can be analyzed in detail in the same way.

Next, the adjustment processing unit 7f generates a control command for controlling the adjustment mechanism (13A to 13D) based on the analysis result of the analysis result storage unit 8f (S203), and transmits this to the necessary adjustment mechanism. The adjustment mechanism is controlled (S204). Next, the reimaging processing unit 7g operates the second imaging means 12, and after the adjustment, the same area 9 of the printed surface is imaged again in detail (S205), and the detailed image information storage unit 8e adjusts. It is stored as later information (S206).

The reanalysis processing unit 7h analyzes the image in the same manner as in S201 (S207) and stores it in the analysis result storage unit 8f (S208). As a result of this reanalysis, when it is determined that re-adjustment is necessary (S209), the procedure of S203-is repeated in order to re-adjust the predetermined adjustment mechanisms (13A to 13D). Whether or not the adjustment is necessary again can be determined by whether or not the deviation from the above-mentioned normal value is within the range of a predetermined threshold value.

When it is determined in S209 that re-adjustment is unnecessary, the second analysis processing unit 7i next determines the area 9 corresponding to the printed surface printed after the adjustment from the image information obtained by the first imaging means 11. Is analyzed (S210). As a result of this analysis, if it is determined that the defect remains unchanged, it is considered that further adjustment is necessary, and it is configured to return to S203, generate new control information, and repeat S204 and below. With this configuration, it is possible to control the printing apparatus so that the printed surface has higher quality.

Regarding these two types of feedback control of the adjustment processing unit 7f, only one of them may be used, or both of them may be omitted. Further, as for both feedback controls, the feedback control based on the reanalysis processing unit 7h may be first completed as in this example, and then the feedback control based on the second analysis processing unit 7i may be performed, or the feedback control may be performed simultaneously. Both feedback controls may be performed, or may be combined as appropriate.

The adjustment mechanism (13A to 13D) of each printing device can be a misregistration adjustment mechanism, a plate pressure adjustment mechanism, an ink adjustment mechanism, or other mechanism. Conventionally, ink adjustment is performed by, for example, an operator adding water to change the viscosity, but this can also be automated as appropriate, such as by providing a device for automatically adding a set amount of water or ink stock solution. can. As described above, according to the present invention, the automation of the printing apparatus 1 can be promoted, so that the control of the entire printing system including the adjustment of the printing apparatus can be completely unmanned in the closed system.

The computer 5 may be distributed and configured in a plurality of devices. For example, the computer of the defect analysis system S1 and the computer dedicated to the printing device adjustment as the adjustment system S2 may be configured as separate devices, or may be configured as a part of the control computer of the printing device. It can also be configured as part of a control computer that controls operations that are responsible for the entire system, including the printing device.

Although the embodiments of the present invention have been described above, the present invention is not limited to these examples, and it goes without saying that the present invention can be implemented in various forms without departing from the gist of the present invention.

1,1A-1D printing device 2 imaging camera 3 imaging camera 4 moving means 5 computer 6 drying device 7 processing device 7a defect identification processing unit 7b moving processing unit 7c imaging processing unit 7d detailed image storage processing unit 7e defect analysis processing unit 7f adjustment Processing unit 7g Reimaging processing unit 7h Reanalyzing processing unit 7i Analytical processing unit 8 Storage means 8a Master image storage unit 8b Captured image storage unit 8c Defect image storage unit 8d Defect position information storage unit 8e Detailed image information storage unit 8f Analysis result storage Unit 8g Adjustment data storage unit 9 Area 10 Printing surface 11 First imaging means 12 Second imaging means 13A-13D Adjustment mechanism 40 Traverse mechanism 70 Defect detection processing unit 71 Positioning processing unit S1 Defect analysis system S2 Adjustment system W work

Claims (14)

A first imaging means for imaging the printed surface of the workpiece printed by the printing apparatus, and
Similarly, it is a second imaging means for imaging the printed surface of the work printed by the printing apparatus, and is provided at a position on the upstream side closer to the printing apparatus than the first imaging means, and the first imaging means. A second imaging means for capturing in more detail with a higher resolution than the means is provided.
The computer
A procedure for comparing the image information on the printed surface obtained by the first imaging means with the reference image information to identify the defect and its position, and
Based on the defect position information, the second imaging means is operated to capture a detailed image of a region corresponding to the defect position on the print surface of the work printed after the print surface.
A defect analysis method for a printed surface, comprising a procedure of storing detailed image information of the region captured by the second imaging means as information for defect analysis. The second imaging means is an imaging means that images an imaging region narrower than that of the first imaging means.
A moving means for moving the second imaging means along a direction intersecting the flow direction of the work is provided.
The computer
The first aspect of the present invention, wherein the second imaging means is moved to a coordinate position in the work width direction corresponding to the position information based on the position information of the defect before the second imaging means is operated. Defect analysis method for printed surfaces. A drying device for fixing the printed surface to the work is provided on the downstream side of the printing device.
The first imaging means is provided at a position downstream of the drying device.
The defect analysis method for a printed surface according to claim 1 or 2, wherein the second imaging means is provided at a position between the drying device and the printing device. The procedure for analyzing the defect based on the information for defect analysis on the printed surface stored by the computer by the defect analysis method according to any one of claims 1 to 3, and the printing apparatus based on the analysis result. An adjustment method for a printing apparatus comprising a procedure for controlling a predetermined adjustment mechanism provided. The computer further operates the second imaging means, controls the adjusting mechanism, and then causes the region corresponding to the position of the defect on the printed surface of the printed work to be imaged again in detail, and the captured details are captured. The adjustment method of the printing apparatus according to claim 4, wherein the image information is analyzed and the predetermined adjustment mechanism is feedback-controlled based on the analysis result. A claim in which the computer analyzes the image information obtained by the first imaging means on the printed surface of the printed work after controlling the adjusting mechanism, and feedback-controls the predetermined adjusting mechanism based on the analysis result. Item 4. The method for adjusting the printing apparatus according to item 4 or 5. The method for adjusting a printing device according to any one of claims 4 to 6, wherein the adjustment mechanism is at least one of a misregistration adjustment mechanism, a plate pressure adjustment mechanism, and an ink adjustment mechanism. A first imaging means for imaging the printed surface of the workpiece printed by the printing apparatus, and
Similarly, it is a second imaging means for imaging the printed surface of the work printed by the printing apparatus, and is provided at a position on the upstream side closer to the printing apparatus than the first imaging means, and the first imaging means. A second imaging means that captures more detail with higher resolution than the means,
A defect identification processing unit that identifies defects and their positions by comparing the image information of the printed surface obtained by the first imaging means with the reference image information, and the second imaging based on the position information of the defects. An imaging processing unit that operates the means to capture in detail a region corresponding to the position of the defect on the printing surface of the work printed after the printing surface, and a detailed image of the region imaged by the second imaging means. A defect analysis system for a printed surface, which comprises a computer having a storage processing unit that stores image information as information for defect analysis. The second imaging means is an imaging means that images an imaging region narrower than that of the first imaging means.
A moving means for moving the second imaging means along a direction intersecting the flow direction of the work is provided.
8. The eighth aspect of the present invention, wherein the computer has a movement processing unit that operates the moving means based on the position information of the defect and moves the second imaging means to a coordinate position in the work width direction corresponding to the position information. Defect analysis system for printed surfaces. A drying device for fixing the printed surface to the work is provided on the downstream side of the printing device.
The first imaging means is provided at a position downstream of the drying device.
The defect analysis system for a printed surface according to claim 8 or 9, wherein the second imaging means is provided at a position between the drying device and the printing device. A defect analysis processing unit that has the defect analysis system for the printed surface according to any one of claims 8 to 10 and that the computer analyzes the defect based on the stored information for defect analysis of the printed surface. , An adjustment system for a printing apparatus having an adjustment processing unit for controlling a predetermined adjustment mechanism provided in the printing apparatus based on the analysis result. A reimaging processing unit in which the computer further operates the second imaging means to control the adjusting mechanism and then re-images a region corresponding to the position of the defect on the printed surface of the printed workpiece in detail. 11. The adjustment processing unit includes a reanalysis processing unit that analyzes detailed image information captured by the reimaging processing unit, and the adjustment processing unit feedback-controls the predetermined adjustment mechanism based on the result of the reanalysis. The adjustment system for the printing equipment described. The computer includes a second analysis processing unit that analyzes image information obtained by the first imaging means on the print surface of the work printed after controlling the adjustment mechanism, and the adjustment processing unit performs this analysis. The adjustment system of the printing apparatus according to claim 11 or 12, wherein the predetermined adjustment mechanism is feedback-controlled based on the result of the above. The adjustment system for a printing device according to any one of claims 11 to 13, wherein the adjustment mechanism is at least one of a misregistration adjustment mechanism, a plate pressure adjustment mechanism, and an ink adjustment mechanism.

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