JP2009286086A - Printing image detection method and its usage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect defects at the time of printing quickly and easily, and to control waste sheets in printing articles which are not necessary to cut in a succeeding printing process and do not need many webs (printing paper) by mono-color printing. <P>SOLUTION: The invention refers to a printing image detection method which is characterized by administering perpendicular printing balance in the printing direction, by detecting the state of the printing image from the fine line information obtained by measuring the fine lines printed utilizing the detection device that responds to the fine lines which are arbitrarily allotted perpendicularly to the printing direction on the printing image, and by keeping the fine lines located on the printed section which is not cut in the succeeding printing process. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for detecting the state of a print image and a method for using the same in order to inspect print quality.

  Conventionally, in order to inspect the print quality, a defect is detected based on the data obtained by putting a control strip in the surface of the printing paper and measuring the density of the patch of the control strip as in Patent Document 1. A method is disclosed.

  Patent Document 2 discloses a method for detecting a defect by comparing the data obtained by detecting the amount of reflected light for each pixel divided by n lines × m columns on the printing paper surface with a reference value. Yes.

  However, the method of inserting a control strip as in Patent Document 1 prints a 100% solid patch of each color of K, C, M, and Y having a certain area for measuring the density or a range of flat patches. It must be placed in the margin of the paper, etc., and cannot be used for printed materials such as folded flyers that are not cut by post-processing.

  In addition, in the method of detecting the amount of reflected light for each pixel obtained by dividing the entire printing paper surface by n lines × m columns as in Patent Document 2, a line sensor including cells corresponding to the number of light sources and n lines is required. In addition, a processing device for determining whether or not one sheet is detected is necessary.

JP 2004-001378 A JP-A-7-323527

  By the way, the method of inserting the control strip as described above is rarely used in single color printing, but a 100% solid patch or the like is arranged in the margin, and the density of the solid patch is measured at the time of printing. There are also attempts to recognize this.

  However, in this case as well, since it is necessary to cut a 100% solid patch portion by post-processing, there is a problem that it cannot be used for printed matter that is not cut by post-processing such as a leaflet.

  In addition, in the case of four-color printing that needs to be adjusted for each color or newspaper printing with a large number (for example, three or more) of webs (printing paper), if there is a defect, the burden on the operator is high and Since it is necessary to remove defective portions in a short time, the method of detecting the amount of reflected light for each pixel obtained by dividing the entire printing paper by n lines × m columns is effective, but it is monochrome printing and a large number of webs (printing) For printed matter that does not require (paper), the burden on the operator is small, and considering the cost, the effect of using an apparatus that detects the entire printed surface is low.

  The problem to be solved by the present invention is that it is not necessary to cut by post-processing of printing, and in a printed matter that does not require a large number of webs (printing paper) in monochromatic printing, the print density in the direction perpendicular to the printing direction is reduced. An object is to provide a method for quickly and easily finding unevenness and variation, reducing lost paper, and a printed matter printed using this method.

  A first aspect of the present invention is a method used for managing a print balance in a direction perpendicular to a printing direction, wherein a thin line is arbitrarily arranged in a direction perpendicular to the printing direction in the print image, and the fine line Is a method for detecting the state of a printed image from thin line information obtained by measuring a printed thin line by a detection device corresponding to the printing method, wherein the thin line is in a printing unit that is not cut by post-processing. This is an image detection method.

  According to a second aspect of the present invention, there is provided a method used for managing a print balance in a direction perpendicular to a printing direction, wherein a thin line is arbitrarily arranged in a direction perpendicular to the printing direction in the print image, and the fine line Is a method for detecting the state of a printed image from fine line information obtained by measuring a thin line printed by installing a detection device corresponding to the thin line, and the fine line is in a printing unit that is not cut by post-processing. A print image detection method characterized by the above.

  A third invention of the present invention is the printed image detection method according to the first or second invention of the present invention, wherein the thin line is a part of a design.

  A fourth invention of the present invention is the printed image detection method according to the first or second invention of the present invention, wherein the thin line is a part of a character.

  A fifth invention of the present invention is the printed image detection method according to the first or second invention of the present invention, wherein the thin line is a part of a symbol.

  A sixth invention of the present invention is the printed image detection method according to the first or second invention of the present invention, wherein the thin line is a multiple line.

  A seventh invention of the present invention is the printed image detection method according to the first or second invention of the present invention, wherein the fine lines are in a straight line.

  An eighth invention of the present invention is a printed matter by a printing method using the printed image detection method according to any one of the first to seventh inventions of the present invention.

  According to the present invention, the detection device corresponding to the fine line arbitrarily arranged in the direction perpendicular to the print direction of the print image performs measurement of the printed fine line, and obtains the fine line information, thereby causing excessive density or You can check or recognize the shortage. That is, the portion where the thin line width is thick is excessively concentrated, and the portion where the thin line width is thin is excessively concentrated. With this information, it is possible to quickly correct the printing operation and suppress the occurrence of lost paper.

  In addition, by forming the thin line into a printed portion that is not cut by post-processing, it is possible to apply the thin line as a part of the design to a printed material that is not cut by post-processing such as an insert flyer.

  Furthermore, the ink consumption is reduced and the cost is reduced because it is a finer line than the method that requires a solid patch to measure the density as in Patent Document 1.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows an example in which fine lines 10 a, 10 b, 10 c, 10 d, and 10 e are arranged to recognize the print state of the print image 40. Moreover, it is the example which installed the detection apparatus 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h in eight places. The print state of each fine line represents the print density in the print direction of each fine line.

  As the detection device, a known measuring device or imaging device can be used, and fine line information can be obtained from the amount of reflected light detected by the detection device.

  Furthermore, a control device or an alarm device when a print image state changes and a printing defect occurs may be suitably selected. Or it is good also as a structure controlled by printing machine itself by sending an alarm signal to a printing machine.

  Further, even if the above apparatus cannot be installed due to a burden in terms of funds, the present invention can be implemented with a sample taken at the time of printing. In this case, thin line information can be obtained by using a handy type measuring instrument, for example, a spectro plate manufactured by Tesicon or Tri-PMC manufactured by Nihon Himeki Equipment Co., Ltd.

  FIG. 2 shows an example in which rectangular designs 12a, 12b, 12c, and 12d and a triangular design 13 are arranged as a design of the print image 40, and fine lines 10f, 10g, 10h, 10i, and 10j included in each design are arranged.

  FIG. 3 shows an example in which fine lines 10k and 10l are arranged on a straight line as a design of the print image 40.

  FIG. 4 shows an example in which fine lines 10n, 10s and rectangular symbols 12e, 12f, 12g, 12h, 12i are arranged as a design of the printed image 40, and fine lines 10m, 10o, 10p, 10q, 10r included in each symbol are arranged. is there.

  FIG. 5 shows an example of a print image showing the state of the line width of the print portion and the fine line normal portion 30 corresponding to that portion as an example of a non-defective print, and showing that the print normal portion 20 is formed.

  FIG. 6 shows the state of the line widths of the printed portion and the fine line normal portion 30 and the fine line defective portion 31 corresponding to the printed portion as an example of the defective print product, and the fine line extending in the direction perpendicular to the print direction. This is an example of a print image showing that the density of the print portion of the print image 40 is increased and the print failure portion 21 is formed corresponding to the thin line defect portion 31 having a large width.

In the example of this invention, it is a schematic diagram showing that the thin line was arbitrarily arranged in the printed image and the detection apparatus was installed so as to correspond to this thin line. In this example, the detection devices are installed at eight locations. In the example of the present invention, a printed image has a design as a design, and a thin line is an example of a printed image showing that it is arranged as a part of the design. In the example of the present invention, it is an example of a printed image showing that a thin line is on a straight line. In the example of the present invention, the print image is an example of the print image showing that the fine line and the fine line included in a part of the design are arranged as a design. It is an example of a print image showing a normal print portion in the case of a non-printable product and a state of a fine line corresponding to that portion. It is an example of a print image showing the state of a fine line corresponding to a normal print portion and a bad print portion in the case of a defective print product.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mouth side part 2 Mouth side part 4a, 4b, 4c, 4d, 4e, 4f, 4g, 4h Detector 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10i, 10j, 10k, 10l, 10m, 10n, 10o, 10p, 10q, 10r, 10s Fine wire 12a, 12b, 12c, 12d, 12e, 12f, 12g, 12h, 12i Rectangular design 13 Triangle design 20 Print normal part 21 Print defective part 30 Fine line normal part 31 Fine line Defective part 40 Print image

Claims (8)

  This is a method used to manage the print balance in the direction perpendicular to the print direction. The print image is printed with a thin line arbitrarily in the direction perpendicular to the print direction and printed by a detection device corresponding to the fine line. A method for detecting a state of a print image from thin line information obtained by measuring a thin line, wherein the thin line is in a printing part that is not cut by post-processing.   This is a method used to manage the print balance in the direction perpendicular to the print direction. Arbitrary fine lines are placed in the print image in the direction perpendicular to the print direction, and a detector is installed to correspond to the fine lines. A method for detecting a state of a printed image from thin line information obtained by measuring a printed thin line, wherein the thin line is in a printing unit that is not cut by post-processing.   The printed image detection method according to claim 1, wherein the thin line is a part of a design.   The print image detection method according to claim 1, wherein the thin line is a part of a character.   The printed image detection method according to claim 1, wherein the thin line is a part of a symbol.   The print image detection method according to claim 1, wherein the thin line is a multiple line.   The print image detection method according to claim 1, wherein the thin lines are arranged on a straight line.   A printed matter using a printing method using the print image detection method according to claim 1.

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