JP2011110886A - Registering device of printer and method for registering printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a registering device of printer which can make a correct registering of printing positions between the face and back sides of printing paper, and a method for registering a printer. <P>SOLUTION: The registering device of printer includes a camera 31 for photographing a transmitted image arranged opposite to one of the face or back side of printing paper with a pictorial pattern printed by a first printing part and a second printing part, and an illuminant 32 for photographing a transmitted image arranged opposite to the other side. The camera 31 for photographing a transmitted image photographs a first register mark and a second register mark simultaneously in such a state that the light emitted by the illuminant 32 for photographing a transmitted image has transmitted the printing paper. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a registration device for a printing press and a registration method for a printing press.

  Conventionally, the registration of the front and back surfaces of a double-sided printing machine is as follows. As disclosed in Patent Document 1 below, the front and back cameras are moved to the registration mark positions in the left and right directions by each motor, and the timing is adjusted to the front surface. And the back side reference register mark (black register mark), respectively, and calculating the amount of misregistration between the front and back from the position of each reference register mark in each image.

JP 61-118249 A Japanese Utility Model Publication No. 64-42135

Masatoshi Okutomi, 15 people outside, “Digital Image Processing”, 2nd edition, Association for Promotion of Image Information Education, March 1, 2006, p. 202-205

However, in the above-described registration of the front and back surfaces of the conventional double-sided printing machine, since each camera is aligned by a mechanism such as a ball screw, backlash occurs, and the positions of the front and back cameras are determined. There is a first problem that it is difficult to match accurately and a detection error occurs.
In addition, there is a second problem that it is difficult to perfectly match the imaging timing due to electrical delay, variation, and the like, and accordingly, the detection timing is slightly shifted and a detection error occurs accordingly.
In addition, in the case of web printing, since the web meanders to the left and right or expands and contracts, the third problem is that the imaging position of the web changes due to a shift in detection timing, and a detection error occurs accordingly. there were.

  In view of the above, an object of the present invention is to provide a printing press registration device and a printing press registration method capable of accurately performing registration between front and back sides.

A registration apparatus for a printing press according to the first invention for solving the above-described problems is as follows.
In a printing machine including a first printing unit that prints a pattern on the front surface of a printing paper and a second printing unit that prints a pattern on the back side of the printing paper,
The first registration mark printed by the first printing unit is imaged, the second registration mark printed by the second printing unit is imaged, and the position of the imaged first registration mark And a registration device of a printing machine that matches the position of the pattern printed by the first printing unit and the position of the pattern printed by the second printing unit from the position of the imaged second registration mark. ,
An image pickup unit facing one of the front and back surfaces of the printing paper on which a pattern is printed by the first printing unit and the second printing unit, and an illumination unit facing the other,
The image pickup means picks up images of the first register mark and the second register mark at the same time in a state where light from the illumination means is transmitted through the printing paper.

A registration device for a printing press according to a second invention for solving the above-described problem is a registration device for a printing press according to the first invention.
The printing machine is a printing machine further comprising a third printing unit that prints a pattern on the surface of printing paper,
The registration device of the printing machine further captures an image of the third registration mark printed by the third printing unit, and positions of the imaged first registration mark and the captured third registration mark. A registration device of a printing machine that aligns the position of the pattern printed by the first printing unit and the position of the pattern printed by the third printing unit from the position of the mark;
The image pickup means picks up images of the first register mark and the third register mark simultaneously in a state where light from the illumination means is transmitted through the printing paper.

A registration device for a printing press according to a third invention for solving the above-described problem is a registration device for a printing press according to the first invention.
The printing machine is a printing machine further comprising a fourth printing unit that prints a pattern on the back surface of the printing paper,
The registration device of the printing press further images the fourth registration mark printed by the fourth printing unit, and positions of the imaged second registration mark and the imaged fourth registration mark. A registration device of a printing machine that aligns the position of the pattern printed by the second printing unit and the position of the pattern printed by the fourth printing unit from the position of the mark;
The image pickup means picks up images of the second register mark and the fourth register mark at the same time in a state where light from the illumination means is transmitted through the printing paper.

A registration device for a printing press according to a fourth invention for solving the above-described problem is a registration device for a printing press according to the first invention.
The registration is characterized in that it is alignment in the left-right direction.

A registration device for a printing press according to a fifth aspect of the present invention for solving the above problem is the registration device for a printing press according to the first aspect of the invention,
The registration is a vertical alignment.

A method of registering a printing press according to a sixth aspect of the present invention for solving the above problem is as follows:
In a printing machine including a first printing unit that prints a pattern on the front surface of a printing paper and a second printing unit that prints a pattern on the back side of the printing paper,
The first registration mark printed by the first printing unit is imaged, the second registration mark printed by the second printing unit is imaged, and the position of the imaged first registration mark And a registration device of a printing machine that matches the position of the pattern printed by the first printing unit and the position of the pattern printed by the second printing unit from the position of the imaged second registration mark. ,
An imaging unit is provided facing one of the front and back surfaces of the printing paper on which a pattern is printed by the first printing unit and the second printing unit, and an illumination unit is provided facing the other.
The first register mark and the second register mark are simultaneously imaged by the imaging unit in a state where light from the illumination unit is transmitted through the printing paper.

A registration method for a printing press according to a seventh aspect of the invention for solving the above problem is the registration method for a printing press according to the sixth aspect of the invention,
The printing machine is a printing machine further comprising a third printing unit that prints a pattern on the surface of printing paper,
The registration device of the printing machine further captures an image of the third registration mark printed by the third printing unit, and positions of the imaged first registration mark and the captured third registration mark. A registration device of a printing machine that aligns the position of the pattern printed by the first printing unit and the position of the pattern printed by the third printing unit from the position of the mark;
The first registration mark and the third registration mark are simultaneously imaged by the imaging unit in a state where light from the illumination unit is transmitted through the printing paper.

A registration method for a printing press according to an eighth invention for solving the above-mentioned problem is the registration method for a printing press according to the sixth invention,
The printing machine is a printing machine further comprising a fourth printing unit that prints a pattern on the back surface of the printing paper,
The registration device of the printing press further images the fourth registration mark printed by the fourth printing unit, and positions of the imaged second registration mark and the imaged fourth registration mark. A registration device of a printing machine that aligns the position of the pattern printed by the second printing unit and the position of the pattern printed by the fourth printing unit from the position of the mark;
The second register mark and the fourth register mark are simultaneously imaged by the imaging unit in a state where light from the illumination unit is transmitted through the printing paper.

A registration method for a printing press according to a ninth invention for solving the above-described problem is the registration method for a printing press according to the sixth invention,
The registration is characterized in that it is alignment in the left-right direction.

A registration method for a printing press according to a tenth aspect of the invention for solving the above problem is the registration method for a printing press according to the sixth aspect of the invention,
The registration is a vertical alignment.

  ADVANTAGE OF THE INVENTION According to this invention, the registration apparatus of the printing press and the registration method of a printing press which can perform the registration between front and back correctly can be provided.

It is the block diagram which showed the structure of the registration apparatus of the printing press which concerns on a present Example. It is the block diagram which showed the structure of the registration apparatus of the printing press based on a present Example following FIG. 1A. It is the block diagram which showed the structure of the registration apparatus of the printing press based on a present Example following FIG. 1B. It is the operation | movement flowchart which showed the procedure of the process in the registration apparatus of the printing press which concerns on the Example of this invention, and the registration method of a printing press. It is the operation | movement flowchart which showed the procedure of the process in the registration apparatus of the printing press and the registration method of a printing press which concern on the Example of this invention following FIG. 2A. It is the schematic diagram which showed the structure of the principal part of the registration apparatus of the printing press which concerns on the Example of this invention. It is the schematic diagram which showed the example of the printing machine which concerns on the Example of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment for carrying out a printing machine registration apparatus and a printing machine registration method according to the present invention will be described with reference to the drawings.

Embodiments of a printing press registration apparatus and a printing press registration method according to the present invention will be described below.
First, an outline of the configuration of the printing press according to the present embodiment will be described.
FIG. 4 is a schematic diagram illustrating an example of a printing machine according to the present embodiment.
As shown in FIG. 4, in the double-sided four-color web rotary printing press that is the printing press according to this embodiment, the web W continuously supplied from the paper feeding device 100 is Y (yellow), M (magenta). , C (cyan), K (black), when passing through the duplex printing unit 101 of various colors, various printing is performed, and then when passing through the dryer 102, it is heated and dried, and subsequently It is cooled when passing through the cooling device 103, and after passing through the web pass device 104 and the drag device 105, after tension control or change of direction is performed, it is cut into a predetermined shape and folded by the folding machine 106. . Web guide devices 107 and 108 are provided on the upstream side (the sheet feeding device 100 in the illustrated example) and the downstream side (the drag device 105 in the illustrated example) of the dryer 102.
The above is the outline of the configuration of the printing press according to the present embodiment.

Next, the configuration of the registration device of the printing press according to the present embodiment will be described.
1A to 1C are block diagrams illustrating a configuration of a registration apparatus for a printing press according to the present embodiment.
As shown in FIGS. 1A to 1C, a registration apparatus for a printing press according to this embodiment includes a CPU 10, a ROM 11, a RAM 12, and input / output devices (hereinafter referred to as I / O) 20, 30, 40 on a bus 13. , 50.

  The printing press registration apparatus according to this embodiment includes an imaging timing detection counter 21 and a printing press rotational phase detection rotary encoder 22 via an I / O 20. Note that the rotary encoder 22 for detecting the rotational phase of the printing press is attached to a rotary member of the printing press, and outputs a clock pulse to the imaging timing detection counter 21 every time the printing press rotates by a certain angle, and at the same time the reference rotation of the printing press. A zero pulse is output to the imaging timing detection counter 21 once per revolution of the printing press in phase, and the imaging timing detection counter 21 is reset. Therefore, the imaging timing detection counter 21 counts the clock pulses of the rotary encoder 22 for detecting the rotational phase of the printing press from the reference rotational phase of the printing press, and the count value is the current rotational phase of the printing press. Represents.

Further, the registration device of the printing press according to the present embodiment includes a transmission imaging camera 31 and a transmission imaging illumination 32 via an I / O 30.
Here, the configuration of the main part of the registration device of the printing press according to the present embodiment will be described.
FIG. 3 is a schematic diagram illustrating a configuration of a main part of the registration device of the printing press according to the present embodiment. FIG. 3A is a schematic diagram showing the configuration of the main part of the registration device of the printing press according to the present embodiment, and FIG. 3B shows an example of the registration mark according to the present embodiment. It is an enlarged view.

  As shown in FIG. 3A, the registration device of the printing press according to the present embodiment includes a transmission imaging camera 31 installed above the web W and a transmission imaging illumination installed below the web W. 32.

  Further, as shown in FIG. 3B, a registration mark 1a on the front surface and a registration mark 1b on the back surface are printed in the vicinity of the paper edge portion of the web W while being shifted in position. The front registration mark 1a is composed of a front black registration mark 2a, a front cyan registration mark 3a, a front magenta registration mark 4a, and a front yellow registration mark 5a. The back registration mark 1b includes a black registration mark 2b on the back, a cyan registration mark 3b on the back, a magenta registration mark 4b on the back, and a yellow registration mark 5b on the back.

  Then, the transmission imaging camera 31 captures images at a time so that the front registration mark 1a and the rear registration mark 1b are captured. In the present embodiment, the amount of misregistration between the front and back sides is calculated using the front black register mark 2a and the back black register mark 2b as the reference color register mark.

Further, the registration device of the printing press according to the present embodiment includes an input device 41, a display device 42, a CRT 43, and a recording device (FD, HDD) 44 via an I / O 40.
In addition, the registration device of the printing press according to the present embodiment includes a first color registration adjustment device 51 via the I / O 50, and the first color registration adjustment device 51 has a first color registration on the front side. An adjustment device 52 and a first color registration adjustment device 53 on the back side are provided.

  The front side first color registration adjustment device 52 includes a front side first color vertical direction registration adjustment device motor 55 and a front side first color vertical direction registration adjustment device motor 55 which controls the front side first color vertical registration control device 55. Motor driver 54 of the adjustment device, motor 57 of the first color left and right direction registration adjustment device on the surface side, motor driver of the first color left and right direction registration adjustment device on the surface side that controls the motor 57 of the first color left and right direction registration adjustment device on the surface side 56.

  The first color registration adjustment device 53 for the first color on the back side is a motor 59 of the first color vertical direction registration adjustment device on the back side and a first color vertical direction registration on the back side that controls the motor 59 of the first color vertical direction registration adjustment device on the back side. Motor driver 58 of the adjustment device, motor 61 of the first color left and right direction registration adjustment device on the back side, motor driver of the first color left and right direction registration adjustment device on the back side that controls the motor 61 of the first color left and right direction registration adjustment device on the back side 60.

  Further, the registration device of the printing press according to the present embodiment is a second color registration adjustment device 62, a third color registration adjustment device 63, and a fourth color registration adjustment device 64 having the same configuration as the first color registration adjustment device 51. It has. Note that the structures of the first color registration adjustment device 51, the second color registration adjustment device 62, the third color registration adjustment device 63, and the fourth color registration adjustment device 64 are generally known. The description here is omitted (see Patent Documents 1 and 2 above).

In addition, the registration device of the printing press according to the present embodiment includes an imaging timing storage memory M1, an imaging data storage memory M2, and a top / horizontal position storage memory M3 for each color registration mark on the surface. , A memory M4 for storing the registration mark for each color on the back surface and the horizontal direction, a memory M5 for storing a distance in the vertical direction from the registration mark for the reference color on the front surface to the registration mark for each color on the front surface, and a registration mark for the reference color on the front surface Distance memory M6 in the horizontal direction from the registration mark of each color to the front surface, memory for memory M7 in the vertical direction from the registration color of the reference color on the back surface to the registration mark of each color on the back surface, registration mark of the reference color on the back surface Memory M8 in the left-right direction from the registration mark of each color to the registration mark on the back surface, memory M9 for storing the surface top and bottom reference distance for each color, memory for storing the surface left and right reference distance for each color 10. Back side vertical reference distance storage memory M11 for each color, left and right reference distance storage memory M12 for each color, top and bottom direction registration amount storage memory M13 for each color, and left and right registration amount storage for each color on the front surface Memory M14, memory M15 for storing a registration amount in the vertical direction between the colors on the back surface, memory M16 for storing a registration amount in the horizontal direction between the colors on the back surface, and registration of the reference color on the back surface from the registration mark on the reference color on the front surface Distance storage memory M17 to the vertical direction up to the mark, memory M18 in the horizontal direction from the registration mark of the reference color on the front surface to the registration mark of the reference color on the back surface, memory M19 for the front and back vertical reference distance storage, the front and back side reference Distance storage memory M20, memory M21 for registering the amount of misalignment between the front and back, memory M22 for registering the amount of misregistration between the front and back, and each color on the back Up-and-down direction registration amount storage memory M23, left-and-right direction registration amount storage memory M24, front-side and up-and-down direction registration device storage memory M25, and front-and-back direction color registration A correction amount storage memory M26 of the adjustment device, a correction amount storage memory M27 of the top and bottom direction registration adjustment device for each color on the back surface, and a correction amount storage memory M28 of the left and right direction registration adjustment device for each color of the back surface are provided.
The above is the apparatus configuration of the registration apparatus of the printing press according to the present embodiment.

Next, a description will be given of a processing procedure in the printing press registration apparatus and the printing press registration method according to the present embodiment.
FIG. 2A and FIG. 2B are operation flowcharts showing processing procedures in the registration device for a printing press and the registration method for the printing press according to the present embodiment.
Note that the transmission imaging illumination 32 is turned on before the operation of the operation flow of FIGS. 2A and 2B, and is turned off when the operation of the registration device is completed.

  As shown in FIGS. 2A and 2B, in step P1, the CPU 10 compares the value of the imaging timing detection counter 21 with the value stored in the memory M1 to determine whether it is the imaging timing. In step P1, when the CPU 10 compares the value of the imaging timing detection counter 21 with the value stored in the memory M1 and determines that it is the imaging timing, it executes step P2. In Step P1, when the CPU 10 compares the value of the imaging timing detection counter 21 with the value stored in the memory M1 and determines that it is not the imaging timing, it executes Step P1 again.

In step P2, the CPU 10 performs imaging and stores it in the memory M2. After completing the process in Step P2, the CPU 10 executes Step P3.
In Step P3, the CPU 10 calculates the top / bottom direction positions of the registration marks for the respective colors on the surface and stores them in the memory M3. After completing the process in Step P3, the CPU 10 executes Step P4.

  In Step P4, the CPU 10 calculates the top / bottom direction positions of the registration marks for the respective colors on the back surface and stores them in the memory M4. After completing the process in Step P4, the CPU 10 executes Step P5.

  In step P3 and step P4, the vertical and horizontal positions of the registration marks of the respective colors are calculated from the center positions of the registration marks of the respective colors in the imaging data obtained by using template matching. Since the template matching method is generally known, description thereof is omitted here (see Non-Patent Document 1 above).

  In step P5, the CPU 10 calculates the distance in the vertical direction from the registration mark of the surface reference color to the registration mark of each color of the surface and stores it in the memory M5, and from the value, the surface top and bottom reference of each color stored in the memory M9. The distance is subtracted to calculate the amount of registration in the vertical direction of each color on the surface and stored in the memory M13. The registration amount in the vertical direction is obtained from the subtracted vertical distance, the magnification of the imaging camera, and the interval between the CCD elements of the imaging camera. After completing the process in Step P5, the CPU 10 executes Step P6.

  In step P6, the CPU 10 calculates the distance in the left-right direction from the registration mark for the reference color on the surface to the registration mark for each color on the surface, stores the distance in the memory M6, and calculates the surface left-right reference for each color stored in the memory M10 from that value. By subtracting the distance, the amount of misregistration in the horizontal direction of each color on the surface is calculated and stored in the memory M14. After completing the process in Step P6, the CPU 10 executes Step P7.

  In step P7, the CPU 10 calculates the distance in the vertical direction from the registration mark for the reference color on the back surface to the registration mark for each color on the back surface, stores the distance in the memory M7, and from the value, the back surface top reference for each color stored in the memory M11. By subtracting the distance, the amount of registration in the vertical direction between the colors on the back surface is calculated and stored in the memory M15. After completing the process in Step P7, the CPU 10 executes Step P8.

  In Step P8, the CPU 10 calculates the distance in the left-right direction from the registration mark for the reference color on the back surface to the registration mark for each color on the back surface, and stores it in the memory M8. By subtracting the distance, the amount of misregistration in the left-right direction between the colors on the back surface is calculated and stored in the memory M16. After completing the process in Step P8, the CPU 10 executes Step P9.

  In Step P9, the CPU 10 calculates the distance in the vertical direction from the registration mark for the reference color on the front surface to the registration mark for the reference color on the back surface, stores it in the memory M17, and stores the front and back top reference distance stored in the memory M19 from the calculated value. Is subtracted to calculate the amount of misregistration between the front and back sides and stored in the memory M21. After completing the process in Step P9, the CPU 10 executes Step P10.

  In Step P10, the CPU 10 calculates the distance in the left-right direction from the registration mark for the reference color on the front surface to the registration mark for the reference color on the back surface, and stores the distance in the memory M18. Is subtracted to calculate the amount of misregistration in the left-right direction between the front and back sides and stored in the memory M22. After completing the process in Step P10, the CPU 10 executes Step P11.

  In Step P11, the CPU 10 calculates the amount of registration in the vertical direction between the front and back colors by adding the amount of registration in the vertical direction between the front and back sides to the amount of registration in the vertical direction between the colors on the back surface, and stores it in the memory M23. Remember. Note that the vertical misregistration amount between the front and back surfaces is obtained from the added vertical misalignment amount between the front and back surfaces, the magnification of the imaging camera, and the interval between the CCD elements of the imaging camera. After completing the process in Step P11, the CPU 10 executes Step P12.

  In Step P12, the CPU 10 adds the left-right registration amount between the front and back sides to the left-right registration amount between the respective colors on the back surface, calculates the left-right registration amount for each color on the back side, and stores it in the memory M24. Remember. After completing the process in Step P12, the CPU 10 executes Step P13.

  In Step P13, the CPU 10 calculates the correction amount of the top / bottom direction registration adjustment device for each surface color from the top / bottom registration amount of each surface color and stores it in the memory M25. The correction amount of the top / bottom direction registration adjustment device is obtained from the relationship between the top / bottom direction registration shift amount obtained in step P5 and the driving amount of the top / bottom direction registration adjustment device motor and the top / bottom direction movement amount. After completing the process in Step P13, the CPU 10 executes Step P14.

  In Step P14, the CPU 10 calculates the correction amount of the horizontal registration adjustment device for each color on the surface from the registration amount in the horizontal direction for each color on the surface, and stores it in the memory M26. It should be noted that the correction amount of the left-right direction registration adjustment device is obtained from the relationship between the left-right direction registration amount obtained in step P6 and the motor drive amount of the left-right direction registration adjustment device and the left-right direction movement amount. After completing the process in Step P14, the CPU 10 executes Step P15.

  In Step P15, the CPU 10 calculates the correction amount of the vertical direction registration adjustment device for each color on the back surface from the registration amount in the vertical direction for each color on the back surface, and stores it in the memory M27. After completing the process in Step P15, the CPU 10 executes Step P16.

  In Step P16, the CPU 10 calculates the correction amount of the horizontal registration adjustment device for each color on the back surface from the registration amount in the horizontal direction for each color on the back surface, and stores it in the memory M28. After completing the process in Step P16, the CPU 10 executes Step P17.

  In step P <b> 17, the CPU 10 outputs each correction amount to the motor driver of the top / bottom direction registration adjustment device for each color of the surface. After completing the process in Step P17, the CPU 10 executes Step P18.

In step P18, the CPU 10 outputs each correction amount to the motor driver of the top / bottom direction registration adjustment device for each color on the back surface. In this way, the position of the pattern printed by each printing unit is adjusted by driving the motor of the top / bottom direction registration adjustment device for each color of the front and back surfaces. After completing the process of Step P18, the CPU 10 ends the series of processes and repeats the operation flow until a control end command is input.
The above is the processing procedure in the registration apparatus and the registration method of the printing press according to the present embodiment.

  As described above, according to the printing press registration apparatus and the printing press registration method according to the present invention, the transmission surface registration is performed by the single transmission imaging camera 31 provided on the front side or the back side. By registering an image of the mark 1a and the registration mark 1b on the back side at a time and calculating the amount of registration deviation between the front and back sides from the position of the registration mark of each reference color, the registration between the front and back sides can be accurately performed.

  The present invention can be used for registration between front and back surfaces of a printing press.

1a surface register mark, 2a surface black register mark, 3a surface cyan register mark, 4a surface magenta register mark, 5a surface yellow register mark, 1b back register mark, 2b back register black Mark, 3b cyan register mark on the back side, 4b magenta register mark on the back side, 5b yellow register mark on the back side, 10 CPU, 11 ROM, 12 RAM, 20, 30, 40, 50 input / output device (I / O) , 21 Counter for imaging timing detection, 22 Rotary encoder for detecting rotational phase of printing press, 31 Camera for transmission imaging, 32 Illumination for transmission imaging, 41 Input device, 42 Display device, 43 CRT, 44 Recording device (FD, HDD), 51 First color registration adjustment device, 52 Front side first color registration adjustment device, 53 Back side Color registration adjustment device, 54 Motor driver of the first color vertical direction registration adjustment device on the surface side, 55 Motor of the first color vertical direction registration adjustment device on the surface side, 56 Motor driver of the first color left and right direction registration adjustment device on the surface side, 57 Front side first color left and right direction registration adjustment device motor, 58 Back side first color vertical direction registration adjustment device motor driver, 59 Back side first color vertical direction registration adjustment device motor, 60 Back side first color left and right adjustment device Motor driver of direction register adjusting device, 61 Motor of first color left and right direction register adjusting device on back side, 62 Second color register adjusting device, 63 Third color register adjusting device, 644 Color register adjusting device

Claims (10)

In a printing machine including a first printing unit that prints a pattern on the front surface of a printing paper and a second printing unit that prints a pattern on the back side of the printing paper,
The first registration mark printed by the first printing unit is imaged, the second registration mark printed by the second printing unit is imaged, and the position of the imaged first registration mark And a registration device of a printing machine that matches the position of the pattern printed by the first printing unit and the position of the pattern printed by the second printing unit from the position of the imaged second registration mark. ,
An image pickup unit facing one of the front and back surfaces of the printing paper on which a pattern is printed by the first printing unit and the second printing unit, and an illumination unit facing the other,
The registration device for a printing press, wherein the imaging unit images the first registration mark and the second registration mark at the same time in a state where light from the illumination unit is transmitted through the printing paper. The printing machine is a printing machine further comprising a third printing unit that prints a pattern on the surface of printing paper,
The registration device of the printing machine further captures an image of the third registration mark printed by the third printing unit, and positions of the imaged first registration mark and the captured third registration mark. A registration device of a printing machine that aligns the position of the pattern printed by the first printing unit and the position of the pattern printed by the third printing unit from the position of the mark;
2. The printing press according to claim 1, wherein the imaging unit simultaneously images the first registration mark and the third registration mark in a state where light from the illumination unit is transmitted through the printing paper. Registration device. The printing machine is a printing machine further comprising a fourth printing unit that prints a pattern on the back surface of the printing paper,
The registration device of the printing press further images the fourth registration mark printed by the fourth printing unit, and positions of the imaged second registration mark and the imaged fourth registration mark. A registration device of a printing machine that aligns the position of the pattern printed by the second printing unit and the position of the pattern printed by the fourth printing unit from the position of the mark;
2. The printing press according to claim 1, wherein the imaging unit simultaneously images the second registration mark and the fourth registration mark in a state where light from the illumination unit is transmitted through the printing paper. Registration device. The registration device for a printing press according to claim 1, wherein the registration is registration in a horizontal direction. The registration apparatus for a printing press according to claim 1, wherein the registration is alignment in a vertical direction. In a printing machine including a first printing unit that prints a pattern on the front surface of a printing paper and a second printing unit that prints a pattern on the back side of the printing paper,
The first registration mark printed by the first printing unit is imaged, the second registration mark printed by the second printing unit is imaged, and the position of the imaged first registration mark And a registration device of a printing machine that matches the position of the pattern printed by the first printing unit and the position of the pattern printed by the second printing unit from the position of the imaged second registration mark. ,
An imaging unit is provided facing one of the front and back surfaces of the printing paper on which a pattern is printed by the first printing unit and the second printing unit, and an illumination unit is provided facing the other.
A registration method for a printing press, wherein the first registration mark and the second registration mark are simultaneously imaged by the imaging unit in a state where light from the illumination unit is transmitted through the printing paper. The printing machine is a printing machine further comprising a third printing unit that prints a pattern on the surface of printing paper,
The registration device of the printing machine further captures an image of the third registration mark printed by the third printing unit, and positions of the imaged first registration mark and the captured third registration mark. A registration device of a printing machine that aligns the position of the pattern printed by the first printing unit and the position of the pattern printed by the third printing unit from the position of the mark;
The printing machine according to claim 6, wherein the first registration mark and the third registration mark are simultaneously imaged by the imaging unit in a state where light from the illumination unit is transmitted through the printing paper. How to register. The printing machine is a printing machine further comprising a fourth printing unit that prints a pattern on the back surface of the printing paper,
The registration device of the printing press further images the fourth registration mark printed by the fourth printing unit, and positions of the imaged second registration mark and the imaged fourth registration mark. A registration device of a printing machine that aligns the position of the pattern printed by the second printing unit and the position of the pattern printed by the fourth printing unit from the position of the mark;
The printing machine according to claim 6, wherein the second registration mark and the fourth registration mark are simultaneously imaged by the imaging unit in a state where light from the illumination unit is transmitted through the printing paper. How to register. The printing machine registration method according to claim 6, wherein the registration is registration in a horizontal direction. The registration method for a printing press according to claim 6, wherein the registration is vertical alignment.

Images