JP2016196090A - Registering device and method for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable handling of deposition paper and metal paper on which white ink is used.SOLUTION: A solid part 10-2a is printed with white ink on a surface of a base material that causes mirror reflection such as deposition paper and metal paper, and register marks (black, indigo, magenta, yellow register marks) P1-P7 other than a white register mark P8 are printed on the while solid part. The white register mark P8 is not printed on the white solid part 10-2a but formed as a dig-out part (a non-printed part where the surface of the base material is exposed) on the white solid part 10-2a.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a registering apparatus and method for a printing press that registers a pattern of each color printed on a printed material.

  Conventionally, in multicolor printing, a register mark is printed on a margin of a printed material. This register mark is composed of register marks for each color, and is used for registering the pattern of each color printed on the printed matter.

  For example, as shown in FIG. 14, in the margin of the printed material, a black register mark composed of four circular marks P1 to P4 and a yellow register mark composed of one circular mark P5 A register mark RM composed of a magenta (red) register mark made up of one circular mark P6 and a cyan (eye) register mark made up of one circular mark P7 is printed (for example, a patent) Reference 1).

  The registration device of the printing machine takes an image of the register mark RM with a two-dimensional camera (color camera), obtains the positional deviation amount of each color pattern from the positional deviation of the register mark of each color, and according to the obtained positional deviation amount. Then, adjust the position of the plate cylinder of each color that holds the printing plate of each color and the position of the transfer cylinder that conveys the printing paper in the direction of the twist, and adjust the position of the pattern of each color printed on the printed matter (register) (See, for example, Patent Document 2).

  In this case, the area including the register marks of each color is imaged with a color camera, the RGB data of each pixel of the captured image is synthesized, and the grayscale pixel value (256 tone values) of each pixel is obtained. The grayscale pixel value is binarized with a predetermined threshold value to obtain 0/1 image data.

  Here, the threshold value when binarizing the grayscale pixel value is the pixel value of “ki” having the smallest grayscale pixel value among “sumi”, “eye”, “red”, and “ki” As a standard. That is, by setting a threshold value slightly lower than the gray scale pixel value of “ki”, all color register marks are set to “1” level image data, and “sumi”, “eye”, “red”, “ Distinguish between the register mark and the background (white paper (white)). This makes it possible to know the position of the register mark for each color.

US Pat. No. 5,018,213 JP 2012-81617 A

  However, the conventional registration device of a printing machine assumes that the register marks of each color are printed on a white paper, and can cope with vapor deposition paper and metal paper in which white ink is used for normal printing. could not. White ink is used for underprinting on vapor-deposited paper and metal paper.

  For example, as shown in FIG. 15, when a white register mark P8 is added to the register marks P1 to P7 for each color of “sumi”, “eye”, “red”, and “ki” by printing, a white register Since the mark P8 has the same gray scale pixel value as that of white paper (white), it cannot be obtained as “1” level image data and cannot be detected as a register mark.

  In addition, since vapor deposition paper and metal paper are specularly reflected on the surface, it is difficult to read register marks of each color, and erroneous detection and correction are likely to occur. In FIG. 15, the surface of a base material such as vapor-deposited paper or metal paper (surface that is specularly reflected) is indicated by hatching.

  The present invention has been made to solve the above-described problems, and the object of the present invention is to provide a registration apparatus for a printing press that can cope with vapor-deposited paper or metal paper using white ink. And to provide a method.

  In order to achieve such an object, the present invention provides an image pickup means for picking up an area including register marks of each color printed on the blank portion of a base material, and register marks of each color in an image picked up by the image pickup means. In a registration apparatus for a printing press comprising a registration means for registering a pattern of each color printed on a substrate based on a position, the substrate has a mirror-reflecting surface, and each color register mark is The white register mark includes a white register mark, and the white register mark is a hollow portion formed as a non-printing portion where the surface of the substrate is exposed to a part of the solid portion printed with white ink on the surface of the substrate, The register marks other than the white register mark are printed on a solid portion printed with white ink.

  In the present invention, a solid portion is printed with white ink on the surface of the mirror-reflecting base material, and register marks (register marks such as Sumi, Eye, Red, and Ki) other than the white register mark are printed on the white solid portion. Printed. Further, the white register mark is not printed on the white solid part, but is formed as a cutout part on the white solid part.

  In the present invention, the white register mark is formed in the white solid part as a cutout part. In the cut-out portion, the surface of the base material appears as it is, and light is specularly reflected on the surface of the base material that appears in the cut-out portion. For this reason, the cut-out portion formed in the white solid portion is imaged as a blackened mark in which almost no light is detected. In the present invention, a hollowed portion imaged as the blackened mark is detected as a white register mark. Further, in the present invention, the background of each color register mark is not a surface of the base material but a solid white portion. For this reason, there is no specular reflection in the background, and it is possible to detect each color register mark clearly.

  According to the present invention, a white register mark is formed as a cutout part (a non-printing part where the base material is exposed) on a part of the solid part printed with white ink on the surface of the base material. Since the register mark is printed on the solid part printed with white ink, the cut-out part formed on the white solid part can be detected as a white register mark. The register mark of each color can be clearly detected with the background as a background, and it is possible to cope with vapor deposition paper or metal paper using white ink.

It is a figure which shows the principal part of the ink apparatus (inker) in the printing unit of each color in a printing machine. It is a side view showing a sheet-fed rotary printing machine of five colors including white. It is a figure which illustrates the printed matter printed by this printing machine. It is a figure which illustrates the printed matter which made it print a register mark in the center of the left-right margin part of printed matter. It is a figure which illustrates the register mark printed on the margin part of printed matter. FIG. 3 is an external view of a scanner that reads the density value of each color patch of each color of a color bar printed on a printed matter and the position of a register mark of each color of a register mark. It is a top view which shows the set state of the printed matter on the measurement stand of this scanner, and the moving direction (X direction (left-right direction), Y direction (top-and-bottom direction)) of the scanning head which moves on this measurement stand. It is an external view of a scanning head. It is a bottom view of a scanning head. It is a figure which shows the moving direction (measurement direction) of the scanning head at the time of measuring the density value of each color patch of each color of a color bar. It is a block diagram of the principal part of the registration apparatus which aligns the registration of the pattern of each color. It is a figure which shows the set state of the printed matter on the measurement stand of a scanner. It is a flowchart for demonstrating operation | movement of a registration apparatus. It is a figure which shows the conventional register mark printed on the margin part of printed matter. It is a figure which shows the example which added the white register mark by printing to the conventional register mark.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Ink machine]
FIG. 1 shows a main part of an inking device (inker) in a printing unit for each color in a printing press. In the figure, 1 is an ink fountain, 2 is ink stored in the ink fountain 1, 3 is an ink fountain roller, 4 (4-1 to 4-n) are provided in parallel in the axial direction of the ink fountain roller 3. The ink fountain key, 5 is an ink transfer roller, 6 is an ink roller group, 7 is a printing plate mounted on the plate cylinder 8, and a pattern is printed on the printing plate 7.

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

〔Printer〕
FIG. 2 is a side view showing a five-color sheet-fed rotary printing press including white. In the figure, reference numerals 9-1 to 9-5 denote printing units for the respective colors, and the above-described ink devices are provided in the printing units 9-1 to 9-5.

  In this printing machine 100, vapor-deposited paper or metal paper having a specularly reflecting surface is used as a base material, and the surface of the base material having a specularly reflecting surface has five colors including white (Sumi, Eye, Red, Ki , White) prints the pattern. In this printing machine 100, the ink of the printing unit 9-1 of the first color is white, and printing with white ink is first performed. FIG. 3 illustrates a printed matter printed by the printing machine 100.

[Color bar]
On the printed matter 10, a strip-shaped color bar 10-1 is printed in the left-right direction in the blank portion excluding the pattern areas 10A to 10D. In this example, the printed material 10 is printed in the blank area in the ground direction, but may be printed in the blank area in the top direction or may be printed in the middle blank area.

  The color bar 10-1 is composed of regions S1 to Sn including color patches (solid patches with a dot area ratio of 100%) for density measurement of each color of sumi, eye, red, red, and white. The areas S1 to Sn correspond to the key zones of the ink fountain keys 4-1 to 4-n in the printing unit 9 for each color in the printing press 100.

[Register mark]
In addition, a register mark 10-2 is printed on the margin of the printed material 10. In this embodiment, as a simple example, it is assumed that only the registration in the vertical direction and the horizontal direction is performed, and the register mark 10-2 (RM) is printed in the central margin of the printed matter 10.

  In addition, when registering not only in the vertical direction and the horizontal direction but also in the vertical direction, as shown in FIG. 4, for example, a first register mark 10-2 is provided at the center of the right margin of the printed matter 10. Register mark RM1 is printed, and the second register mark RM2 is printed as the register mark 10-2 in the center of the left margin. Such an arrangement of register marks is disclosed in Patent Document 2.

  As shown in FIG. 5, the register mark 10-2 (RM) includes a Sumi register mark composed of four circular marks P1 to P4, a key register mark composed of one circular mark P5, and a circular one. It is composed of a red register mark composed of two marks P6, an eye register mark composed of one circular mark P7, and a white (white) register mark composed of one circular mark P8.

  In this register mark 10-2 (RM), the background is not the surface of the substrate, but a rectangular solid portion 10-2a printed on the substrate with white ink. That is, in the present embodiment, a solid portion (white solid portion) 10-2a is printed with white ink on the surface of the substrate that is specularly reflected, and a white register mark is formed on the white solid portion 10-2a. Register marks (Sumi, Eye, Red, and Ki register marks) P1 to P7 other than P8 are printed. Here, the white register mark P8 is not printed on the white solid portion 10-2a, but is formed on the white solid portion 10-2a as a cutout portion (a non-printing portion where the surface of the base material is exposed). doing. In FIG. 4, the surface of the base material is indicated by oblique lines.

[Scanner]
FIG. 6 shows an external view of a scanner that reads the density value of each color patch of each color of the color bar 10-1 printed on the printed matter 10 and the position of the register mark of each color of the register mark 10-2.

  The scanner 11 includes a measurement table 11-1 on which the printed material 10 is set, and a scanning unit 11-2 that moves on the measurement table 11-1. A scanning head (sensor head) 11-3 (see FIG. 7) is provided in the scanning unit 11-2.

  The scanning unit 11-2 moves the upper surface of the measurement table 11-1 in the X direction (left-right direction) by the X drive mechanism 11-4. The scanning head 11-3 is moved in the Y direction (vertical direction) in the scanning unit 11-2 by the Y drive mechanism 11-5. As a result, the scanning head 11-3 moves in the X and Y directions on the measuring table 11-1 using the X drive mechanism 11-4 and the Y drive mechanism 11-5 as sensor head moving means. The printed matter 10 is set on the measurement table 11-1 with the left-right direction as the X direction and the top-down direction as the Y direction.

[Scanning Head]
FIG. 8 shows an external view of the scanning head 11-3. FIG. 9 shows a bottom view of the scanning head 11-3. Rollers 11-31 and 11-32 for guiding movement in the X direction are provided on the bottom surface of the scanning head 11-3. When the density value of each color patch of each color of the color bar 10-1 is measured or when the position of the register mark of each color of the register mark 10-2 is detected, the scanning head 11-3 is lowered and the roller 11 31 and 11-32 are landed on the upper surface of the measuring table 11-1.

  In addition, a spectroscopic sensor 12 and a two-dimensional camera (color camera) 13 are mounted on the scanning head 11-3. The spectroscopic sensor 12 is a detector (first detector) for measuring the density value of each color patch of each color of the color bar 10-1 printed on the printed material 10. The color camera 13 is a detector (second detector) for detecting the position of the register mark for each color of the register mark 10-2, and is a detection for detecting the position of the color bar 10-1 in the vertical direction. Also serves as a vessel.

  The color camera 13 has an imaging region with a width longer in the vertical direction than the length of the color bar 10-1 in the vertical direction, and is provided in front of the spectral sensor 12. That is, when the moving direction of the scanning head 11-3 when measuring the density value of each color patch of the color bar 10-1 is the measurement direction (see FIG. 10), the installation position is more than the spectroscopic sensor 12. As the measurement direction side, the color camera 13 is mounted on the scanning head 11-3.

[Registration device]
FIG. 11 shows a block diagram of a main part of a registration device for registering each color pattern. The registration device 14 includes the scanner 11 described above, and a registration adjustment that adjusts the registration of the control unit 15 and the printing units 9 (9-1 to 5-5) of each color in response to an instruction from the control unit 15. And a device 16 (16-1 to 16-5).

  Note that the registration adjustment includes vertical and horizontal registration adjustments and twisting registration adjustments, but as described in the description of the register mark, in this embodiment, as a simple example, Only vertical and horizontal registration adjustments shall be performed.

  In addition, as the register adjusting device 16, there are a top and bottom register adjusting device and a left and right register adjusting device. Here, one register adjusting device 16 is shown for each color as a representative of those register adjusting devices. Yes.

  The registration device 14 is realized by hardware including a processor and a storage device and a program that realizes various functions in cooperation with the hardware.

[Set printed matter on top of scanner measurement table]
The operator sets the printed material 10 on the upper surface of the measuring table 11-1 of the scanner 11 as shown in FIG.

  At this time, the position where the printed material 10 is set on the measurement table 11-1 of the scanner 11 is determined as a reference setting position, and the printed material 10 is placed on the measurement table 11-1 so as to match the reference setting position. Set to.

[Input data]
Next, the operator inputs the vertical and horizontal positions of the register mark 10-2 of the printed material 10 to the control unit 15. The control unit 15 stores the position of the input register mark 10-2 of the printed matter 10 in the vertical direction and the horizontal direction.

[Register Mark Imaging]
The control unit 15 reads the vertical and horizontal positions of the register mark 10-2, and moves the scanning head 11-3 to the vertical and horizontal positions of the read register mark 10-2 (FIG. 13: FIG. 13). Step S101).

  At this time, the register mark 10-2 of the scanning head 11-3 is quickly moved to the vertical and horizontal positions with the rollers 11-31 and 11-32 raised. When the register mark 10-2 moves to the top and bottom positions, the rollers 11-31 and 11-32 are landed on the measurement table 11-1.

  And the control part 15 images the register mark 10-2 with the color camera 13 (step S102). That is, an area including register marks P1 to P8 (FIG. 5) for each color is imaged and the captured image data is stored.

  After the register mark 10-2 is imaged by the color camera 13, the control unit 15 returns the scanning head 11-3 to the origin position. The return of the scanning head 11-3 to the origin position at this time is also performed quickly with the rollers 11-31 and 11-32 raised.

[Adjustment of each color register]
Next, the control unit 15 obtains the positions of the register marks P1 to P8 for each color from the image of the register mark 10-2 captured by the color camera 13.

  In this case, the control unit 15 synthesizes RGB data of each pixel of the image captured by the color camera 13 and obtains a grayscale pixel value (256 gradation values) of each pixel (step S103). Then, the obtained gray scale pixel value of each pixel is binarized with a predetermined threshold value to obtain 0/1 image data (step S104).

  Here, the threshold value for binarizing the grayscale pixel value is the same as that for the case where a blank printing paper is used as a base material, and the threshold value for gray is “gray” among “sumi”, “eye”, “red”, “ki”. The pixel value of the scale is set as a value slightly lower than the pixel value of “K” that is the smallest.

  In this embodiment, the white register mark P8 in the register mark 10-2 is not printed on the white solid portion 10-2a, but is cut into the white solid portion 10-2a (the surface of the base material). Is formed as a non-printing part). In the cut-out portion, the surface of the base material appears as it is, and light is specularly reflected on the surface of the base material that appears in the cut-out portion. For this reason, the hollow portion formed in the white solid portion 10-2a is imaged as a blackened mark in which almost no light is detected, and the pixel value of the gray scale exceeds the threshold value.

  As a result, not only the register marks P1 to P7 of each color of “sumi”, “eye”, “red”, and “ki”, but also the white register mark P8 is obtained as “1” level image data. The background of the register marks P1 to P8 for each color is not a surface of the base material but a white solid portion 10-2a. For this reason, there is no specular reflection in the background, and the register marks P1 to P8 of each color are clearly detected.

  The control unit 15 pattern-matches the binarized image data with a register mark pattern (0.5 mm circle), and obtains the positions of the register marks P1 to P8 for each color (step S105). Here, since the register marks P1 to P8 are not yet determined as to what color the register marks are, the positions of the register marks P1 to P8 are obtained.

  Then, the control unit 15 sets the positions of the register marks P1 to P8 obtained by pattern matching using the corresponding positions of the register marks of the respective colors determined in advance using the lower left position of the captured image as a reference. Corresponding to the position of the register mark (step S106).

  That is, register marks P1 to P4 are the Sumi register mark, register mark P5 is the key register mark, register mark P6 is the red register mark, register mark P7 is the eye register mark, and register mark P8 is the white (white) register. Confirm as a mark.

  Then, the control unit 15 registers the register marks P5, P6, P7, P8 around the intersection (intersection of diagonal lines) between the line connecting P1 and P4 of the register marks P1 to P4 of the sumi and the line connecting P2 and P3. , The difference from predetermined reference positions of the register marks P5, P6, P7, and P8 is obtained, and the top and bottom of each color with respect to “sumi” and the left-right color registration error amount are obtained (step S107). .

  Then, the control unit 15 drives the registration adjusting device 16 of the printing unit 9 of each color by the amount of registration error between the top and bottom of each color and the horizontal direction with respect to the obtained “sumi”, and the plate in the printing unit 9 of each color. The vertical and horizontal positions of the cylinder are adjusted (step S108), and the positions (registers) of the patterns of each color printed on the printed material are matched.

  In the embodiment described above, the register marks P1 to P8 of the respective colors are circular marks. However, the mark is not limited to a circular shape, and may be a square or a star.

[Extension of the embodiment]
The present invention has been described above with reference to the embodiment. However, the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the technical idea of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Ink fountain, 2 ... Ink, 3 ... Ink fountain roller, 4 ... Ink fountain key, 5 ... Roller, 6 ... Ink roller group, 7 ... Printing plate, 8 ... Plate cylinder, 9 (9-1 to 9-5) ... Printing Unit: 10: Printed matter, 10-1: Color bar, 10-2 (RM): Register mark, 10-2a: Solid part (white solid part), P1 to P4: Sumi register mark, P5: Key register Mark, P6 ... Red register mark, P7 ... Eye register mark, P8 ... White (white) register mark, 11 ... Scanner, 11-1 ... Measurement table, 11-2 ... Scanning unit, 11-3 ... Scanning head , 12 ... spectral sensor, 13 ... two-dimensional camera (color camera), 14 ... registering device, 15 ... control unit, 16 (16-1 to 16-5) ... register adjusting device, 100 ... printing machine.

Claims (4)

An image pickup unit that picks up an area including register marks of each color printed in a margin part of the base material, and each color printed on the base material based on the position of the register mark of each color in the image picked up by the image pickup means In a registering device for a printing press provided with registering means for registering a pattern,
The substrate has a specularly reflecting surface;
The register marks for each color include white register marks,
The white register mark is a cut-out part formed as a non-printing part where the surface of the base material is exposed to a part of a solid part printed with white ink on the surface of the base material,
The register mark other than the white register mark is printed on a solid portion printed with the white ink. In the registration device of the printing press according to claim 1,
The register means is
Registering a printing press characterized by binarizing a grayscale pixel value of each pixel in the image when the position of the register mark of each color in the image picked up by the image pickup means is obtained Alignment device. An imaging step for imaging an area including register marks of each color printed in the margin part of the base material, and the position of each color printed on the base material based on the position of the register mark of each color in the image captured by the imaging step In a registration method for a printing press comprising a registration step for registering a pattern,
The substrate has a specularly reflecting surface;
The register marks for each color include white register marks,
The white register mark is a cut-out part formed as a non-printing part where the surface of the base material is exposed to a part of a solid part printed with white ink on the surface of the base material,
The register method other than the white register mark is printed on the solid portion printed with the white ink. In the method of registering a printing press according to claim 3,
The registering step includes
Registering a printing press characterized by binarizing a grayscale pixel value of each pixel in the image with a predetermined threshold when obtaining the position of the register mark of each color in the image captured in the imaging step How to match.