WO2018029848A1 - 見当誤差検出装置、見当誤差検出方法および印刷物 - Google Patents
見当誤差検出装置、見当誤差検出方法および印刷物 Download PDFInfo
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- WO2018029848A1 WO2018029848A1 PCT/JP2016/073734 JP2016073734W WO2018029848A1 WO 2018029848 A1 WO2018029848 A1 WO 2018029848A1 JP 2016073734 W JP2016073734 W JP 2016073734W WO 2018029848 A1 WO2018029848 A1 WO 2018029848A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/08—Cylinders
- B41F13/10—Forme cylinders
- B41F13/12—Registering devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F11/00—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination
- B41F11/02—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination for securities
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/02—Conveying or guiding webs through presses or machines
- B41F13/025—Registering devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/08—Cylinders
- B41F13/10—Forme cylinders
- B41F13/12—Registering devices
- B41F13/14—Registering devices with means for displacing the cylinders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0081—Devices for scanning register marks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/02—Arrangements of indicating devices, e.g. counters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/04—Tripping devices or stop-motions
- B41F33/14—Automatic control of tripping devices by feelers, photoelectric devices, pneumatic devices, or other detectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
- B41P2213/90—Register control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2233/00—Arrangements for the operation of printing presses
- B41P2233/50—Marks on printed material
- B41P2233/51—Marks on printed material for colour quality control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2233/00—Arrangements for the operation of printing presses
- B41P2233/50—Marks on printed material
- B41P2233/52—Marks on printed material for registering
Definitions
- the present invention relates to a registration error detection device that detects a registration error based on a registration mark, a registration error detection method, and a printed material on which the registration mark is printed.
- the automatic registration device When printing a multicolored pattern on a web with a rotary printing machine, generally one color is overlaid and printed to form one pattern. In this case, since printing may be shifted when the colors overlap, it is necessary to perform correct alignment so as not to cause misregistration.
- an automatic control device called an automatic registration device.
- the automatic registration device generally includes a registration error detection device that detects a registration error based on a registration mark printed for each color on a web, and a compensator roller or a plate of a rotary printing press so that the registration error is corrected. Control the torso.
- the register mark is also referred to as a register mark.
- the registration error detection device includes, for example, two line sensors provided with a reference interval in the web conveyance direction, and a deviation amount of the interval between the two color registration marks detected by the line sensor from the reference interval. Is a registration error (see, for example, Patent Document 1).
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a technique capable of reducing a registration mark while suppressing a decrease in detection accuracy of a registration error.
- a registration error detection device includes two first registration marks of a first color printed on a substrate by a first plate cylinder of a rotary printing press, An imaging unit that captures a second color second registration mark printed on a substrate by a second plate cylinder of a printing press, and a reference between the two first registration marks in an image captured by the imaging unit A calculation unit that compares the position with a comparison position based on the second registration mark.
- Another aspect of the present invention is a registration error detection method.
- this method two first registration marks of a first color printed on a printing material by a first plate cylinder of a rotary printing press and a first printing mark printed on the printing material by a second printing drum of a rotary printing press.
- a second registration mark of two colors is imaged, and a reference position between the two first registration marks in the captured image is compared with a comparison position based on the second registration mark.
- Still another aspect of the present invention is a printed matter.
- This printed matter is a printed matter on which a register mark for controlling a printing misalignment of a rotary printing press is printed.
- FIG. 1 is a diagram illustrating a rotary printing press 1 including a registration error detection device 100 according to the first embodiment.
- a rotary printing press 1 shown in FIG. 1 is a multicolor gravure rotary printing press capable of four-color printing on a web 30 such as a film as a substrate.
- the rotary printing press 1 includes a first printing unit 12a, a second printing unit 12b, a third printing unit 12c, a fourth printing unit 12d, an unwinding unit 14, and a winding unit. 16, a plurality of compensator rollers 32, a plurality of register motors 34, a monitor 40, and a registration error detection device 100.
- the four first printing units 12a, the second printing unit 12b, the third printing unit 12c, and the fourth printing unit 12d are arranged in series. Note that the first printing unit 12a, the second printing unit 12b, the third printing unit 12c, and the fourth printing unit 12d are collectively referred to as “printing unit 12” as appropriate.
- the unwinding unit 14 for supplying the web 30 to be printed is installed upstream of the first printing unit 12a. Further, a winding unit 16 for winding the printed web 30 is installed downstream of the fourth printing unit 12d. Each printing unit 12 is provided with a plurality of guide rollers 18 to form a conveyance path for the web 30.
- Each printing unit 12 has a cylindrical plate cylinder 20 for transferring ink as a coating agent on the lower side of the web 30 and a cylindrical impression cylinder 22 for applying pressure to the web 30 on the upper side. , Each of which is rotatably mounted around a cylindrical axis. Further, a dryer 24 for drying the printing surface of the web 30 is disposed downstream of each plate cylinder 20.
- the registration error detection device 100 includes three imaging units 26 and a control device 28.
- the control device 28 includes a calculation unit 28a and a control unit 28b.
- An imaging unit 26 is disposed between the plate cylinder 20 and the dryer 24 in each of the second printing unit 12b, the third printing unit 12c, and the fourth printing unit 12d.
- the imaging unit 26 is configured using, for example, a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) that receives light and converts it into an electrical signal.
- CCD Charge-Coupled Device
- CMOS Complementary Metal-Oxide Semiconductor
- the imaging unit 26 of the second printing unit 12b images the first registration mark printed by the first printing unit 12a upstream of itself and the second registration mark printed by its own plate cylinder 20.
- the first registration mark and the second registration mark are marks for controlling printing misalignment of the rotary printing press 1.
- the imaging unit 26 is electrically connected to the control device 28.
- the calculation unit 28a of the control device 28 calculates a registration error between the first registration mark and the second registration mark based on the image captured by the imaging unit 26.
- the calculation unit 28a calculates a vertical registration error that is a registration deviation in the conveyance direction of the web 30 and a horizontal registration error that is a registration deviation in a direction (referred to as a horizontal direction) orthogonal to the conveyance direction in the plane of the web 30. It can be calculated.
- each of the imaging units 26 of the third printing unit 12c and the fourth printing unit 12d also has the first registration mark printed by the printing unit 12 upstream of itself and the first registration mark printed by its own plate cylinder 20. 2. Image the register mark.
- the calculation unit 28a also calculates a registration error between the first registration mark and the second registration mark based on the image captured by the imaging unit 26 for each of the third printing unit 12c and the fourth printing unit 12d. Details of the calculation of the registration error will be described later.
- the supply phase of the web 30 is between the first printing unit 12a and the second printing unit 12b, between the second printing unit 12b and the third printing unit 12c, and between the third printing unit 12c and the fourth printing unit 12d.
- a compensator roller 32 for adjusting the above is disposed.
- the compensator roller 32 is driven by a register motor 34.
- Each register motor 34 is electrically connected to the control device 28, and moves the compensator roller 32 up and down by an instruction from the control unit 28 b of the control device 28 so that the vertical registration error is eliminated. Thereby, the printing misalignment in the vertical direction can be corrected in each printing unit 12.
- the plate cylinders 20 of the second printing unit 12b, the third printing unit 12c, and the fourth printing unit 12d are arranged in such a way that there is no lateral registration error in accordance with an instruction from the control unit 28b of the control device 28. Move in the direction. As a result, it is possible to correct lateral printing misalignment in each printing unit 12.
- the monitor 40 is connected to the control device 28 and displays an image captured by the imaging unit 26. The user can visually recognize the misregistration situation by monitoring the monitor 40.
- the control device 28 includes a computer, and various functions of the control device 28 can be configured by hardware in circuit blocks, memories, and other LSIs, and in software, by programs loaded in the memory, etc. Realized. Therefore, it is understood by those skilled in the art that various functions of the control device 28 can be realized in various forms by hardware only, software only, or a combination thereof, and is not limited to any one.
- FIG. 2 is a diagram illustrating a part of the printed material 300 on which the registration mark 200 according to the first embodiment is printed.
- the printed material 300 includes a web 30, two first color first registration marks 202 and 204, and a second color second registration mark 210 different from the first color.
- the first registration marks 202 and 204 and the second registration mark 210 are collectively referred to as a registration mark 200.
- illustration is omitted, a pattern of the first color and a pattern of the second color are printed outside the area where the register mark 200 of the web 30 is printed.
- the two first registration marks 202 and 204 are printed on the web 30 by the plate cylinder (first plate cylinder) 20 of the first printing unit 12a of the rotary printing press 1.
- the second registration mark 210 is printed on the web 30 by the plate cylinder (second plate cylinder) 20 of the second printing unit 12 b of the rotary printing press 1.
- the distance Dis1 between the centroids of the two first registration marks 202 and 204 is substantially independent of the registration deviation. Is constant.
- the two first register marks 202 and 204 and the second register mark 210 are each circular.
- the area of each of the two first registration marks 202 and 204 is substantially 1 ⁇ 2 of the area of the second registration mark 210.
- the two first registration marks 202 and 204 and the second registration mark 210 are arranged along the conveyance direction dt of the web 30 in the rotary printing press 1.
- the second registration mark 210 is disposed between the two first registration marks 202 and 204.
- the first registration mark 202, 204 and the second registration mark 210 are arranged so that the center of gravity of the second registration mark 210 coincides with the center of gravity of the two first registration marks 202, 204. Yes.
- the center of gravity of the second register mark 210 does not coincide with the center of gravity of the two first register marks 202 and 204.
- the center of gravity of the two first registration marks 202 and 204 represents the midpoint between the center of gravity of one first registration mark 202 and the center of gravity of the other first registration mark 204.
- FIG. 3 is a diagram showing an image of the register mark 200 imaged by the imaging unit 26 of FIG.
- the calculation unit 28a of the registration error detection apparatus 100 performs a comparison based on the reference position P1 between the two first registration marks 202 and 204 in the image captured by the imaging unit 26 and the second registration mark 210 shown in FIG.
- the position P2 is compared, and a registration error is calculated based on the number of pixels between the reference position P1 and the comparison position P2.
- the calculation unit 28a uses the center of gravity of the two first registration marks 202 and 204 obtained by known image processing as the reference position P1, and uses the center of gravity of the second registration mark 210 obtained by known image processing.
- the comparison position is P2. During image processing, it is possible to easily specify the second registration mark 210 having an area different from that of the first registration marks 202 and 204.
- the calculation method of the reference position P1 that is the center of gravity of the two first registration marks 202 and 204 is not particularly limited.
- the computing unit 28a may obtain the center of gravity of the first register mark 202 by known image processing, obtain the center of gravity of the first register mark 204, and obtain the midpoint of these centers of gravity as the reference position P1.
- the calculation unit 28a can directly calculate the reference position P1 based on the areas of the two first registration marks 202 and 204 by known image processing.
- the area of each of the two first registration marks 202 and 204 is substantially 1 ⁇ 2 of the area of the second registration mark 210, the number of samplings of the two first registration marks 202 and 204 in the image ( That is, the sum of the number of pixels) and the sampling number of the second register mark 210 are substantially equal. Therefore, the number of samplings used when directly calculating the center of gravity using the two first registration marks 202 and 204 is substantially equal to the number of samplings used when calculating the center of gravity of the second registration mark 210. . Therefore, such calculation can suppress an error in calculation of the center of gravity.
- the calculation unit 28a calculates the number of pixels between the centroids of the two first registration marks 202 and 204 in the image and the known distance Dis1 between the centroids of the two printed first registration marks 202 and 204. Based on the above, the distance per pixel is calculated. For example, when the known distance Dis1 is 10 mm and the number of pixels is 100 pixels, the distance per pixel is 0.1 mm / pixel. The calculation of the distance per pixel may be performed every time a new image of the first registration marks 202 and 204 is captured, or may be performed every predetermined period.
- the calculation unit 28a calculates the product of the calculated distance per pixel and the number of pixels between the reference position P1 and the comparison position P2 as a registration error. Specifically, the calculation unit 28a calculates a registration error in a direction d1 of a straight line passing through the two first registration marks 202 and 204 in the image and a direction d2 orthogonal to the straight line. The direction d1 is equal to the transport direction dt. The calculation unit 28a calculates the product of the distance per pixel and the number of pixels between the reference position P1 and the comparison position P2 in the direction d1 as a vertical registration error. The calculation unit 28a calculates the product of the distance per pixel and the number of pixels between the reference position P1 and the comparison position P2 in the direction d2 as a lateral registration error.
- the control unit 28b adjusts the conveyance of the web 30 in the conveyance direction dt according to the obtained vertical registration error, adjusts the conveyance of the web 30 in the horizontal direction according to the obtained horizontal registration error, and print misalignment. To correct. Imaging, calculation of registration error, and correction of printing misalignment as described above are performed every time the second registration mark 210 is printed between the two first registration marks 202 and 204, and real-time is performed during printing. The print misalignment is corrected.
- the registration error can be calculated with high accuracy regardless of the distance between the imaging unit 26 and the registration mark 200.
- the user When printing another type of printed matter after printing a certain type of printed matter, the user replaces the plate cylinder 20, but the new plate cylinder 20 is different in width and circumference from those before the replacement. There are many cases. In that case, it is necessary to adjust the position of the imaging unit 26 in accordance with the new plate cylinder 20, but in this embodiment, the registration error can be detected with high accuracy regardless of the distance between the imaging unit 26 and the registration mark 200.
- the position of the imaging unit 26 can be easily adjusted. That is, it is not necessary to accurately match the distance between the imaging unit 26 and the registration mark 200 to a certain distance. Therefore, printing of other types of printed matter can be started in a short time. As a result, the printing time for a plurality of types of printed matter can be shortened.
- FIG. 4 is a diagram illustrating an image of the registration mark 200 when the imaging unit 26 of FIG. 1 is rotated in the in-plane direction of the web 30.
- the imaging unit 26 may rotate in the in-plane direction of the web 30.
- the captured image also rotates as shown in FIG.
- the calculation unit 28a calculates a registration error in the direction d1, that is, the transport direction dt and the direction d2. Therefore, even if the imaging unit 26 rotates in the in-plane direction of the web 30, the vertical registration error in the transport direction dt and the horizontal lateral registration error orthogonal to the transport direction dt are not affected by the rotation. Can be calculated. Therefore, it is not necessary to adjust the rotation angle of the imaging unit 26 in the in-plane direction of the web 30 to exactly 0 °. This also makes it easy to adjust the position of the imaging unit 26.
- FIG. 5 is a diagram illustrating an image of another registration mark 200X when the imaging unit 26 of FIG. 1 rotates in the in-plane direction of the web 30.
- the shape of each registration mark may be a quadrangle as shown in FIG. However, in the case of a quadrilateral, the relationship between the direction of the quadrangular sides and the arrangement direction of the pixels of the image changes according to the rotation of the imaging unit 26 in the in-plane direction of the web 30, so that the end of each registration mark An error may occur in That is, the sampling number of each registration mark in the image may vary between when the imaging unit 26 rotates in the in-plane direction of the web 30 and when the imaging unit 26 does not rotate in the in-plane direction of the web 30. . Therefore, an error may occur in the coordinates of the center of gravity.
- the first register marks 202 and 204 and the second register mark 210 are each circular. For this reason, the number of samplings of the first register mark 202, 204 and the second register mark 210 in the image is unlikely to vary between when the imaging unit 26 rotates in the in-plane direction of the web 30 and when it does not rotate. . Therefore, the error of the center of gravity can be suppressed. That is, the shape of the first register marks 202, 204, etc. is preferably circular.
- the two first register marks 202 and 204 printed by the plate cylinder 20 of the second printing unit 12b and the second register mark 210 printed by the plate cylinder 20 of the third printing unit 12c are also third.
- the registration error can be calculated as described above.
- the second first registration marks 202 and 204 printed by the plate cylinder 20 of the third printing unit 12c and the second registration marks 210 printed by the plate cylinder 20 of the fourth printing unit 12d are also the fourth.
- the registration error can be calculated in the same manner as described above.
- the distance per pixel is obtained using images obtained by imaging the two first color registration marks 202 and 204 of the first color and the second color registration mark 210 of the second color.
- the product of the pixel number between the reference position P1 and the comparison position P2 of the image is calculated as a registration error.
- the reference position P1 can be determined with high accuracy.
- the register mark 200 is imaged by the imaging unit 26, the register mark 200 can be reduced by using the high-resolution image capturing unit 26.
- the register mark 200 can be made small while suppressing a decrease in registration error detection accuracy.
- the registration mark 200 can be reduced, and the two first registration marks 202 and 204 and the second registration mark 210 are arranged in a line along the transport direction dt, so that the registration mark 200 is printed.
- the width of the area can be reduced. After printing, the area where the registration mark 200 of the web 30 is printed is cut, so that waste can be eliminated.
- the second embodiment is different from the first embodiment in that an additional second registration mark is further provided. Below, it demonstrates centering around difference with 1st Embodiment.
- FIG. 6 is a view showing a part of a printed material 300A on which a register mark 200A according to the second embodiment is printed.
- an additional second registration mark 212 of the second color is further printed on the web 30.
- the additional second registration mark 212 is printed on the web 30 by the plate cylinder (second plate cylinder) 20 of the second printing unit 12 b of the rotary printing press 1, similarly to the second registration mark 210.
- the additional second registration mark 212 is also circular.
- the areas of the two first registration marks 202, 204, the second registration mark 210, and the additional second registration mark 212 are substantially equal.
- the first line segment L1 connecting the centroids of the two first registration marks 202 and 204 is orthogonal to the second line segment L2 linking the centroid of the second registration mark 210 and the centroid of the additional second registration mark 212. is doing.
- the 1st line segment L1 and the 2nd line segment L2 should just cross
- the first registration marks 202 and 204 are arranged so that the centroids of the second registration mark 210 and the additional second registration mark 212 coincide with the centroids of the two first registration marks 202 and 204.
- a second registration mark 210 and an additional second registration mark 212 are arranged.
- the centroids of the second registration mark 210 and the additional second registration mark 212 do not coincide with the centroids of the two first registration marks 202 and 204.
- the center of gravity of the second register mark 210 and the additional second register mark 212 is the midpoint between the center of gravity of the second register mark 210 and the center of gravity of the additional second register mark 212.
- the imaging unit 26 further images an additional second registration mark 212 in addition to the two first registration marks 202 and 204 and the second registration mark 210.
- FIG. 7 is a diagram illustrating an image of the register mark 200A captured by the imaging unit 26 according to the second embodiment.
- the calculation unit 28a sets the center of gravity of the second registration mark 210 and the additional second registration mark 212 in the image illustrated in FIG. 7 as the comparison position P2.
- the calculation unit 28a When the angle ⁇ formed by the first line segment L1 and the second line segment L2 in the image is within a predetermined angle range, the calculation unit 28a is similar to the distance per pixel as in the first embodiment. And the product of the number of pixels between the reference position P1 and the comparison position P2 is calculated as a registration error. Then, the calculation unit 28a instructs the control unit 28b to control printing misalignment of the rotary printing press 1.
- the angle range is, for example, a range from (90 ⁇ ) ° to (90 + ⁇ ) °, where ⁇ is a constant, and the optimum value can be appropriately determined by experiments or the like.
- FIG. 8 is a diagram illustrating another image of the registration mark 200A captured by the imaging unit 26 according to the second embodiment.
- the first line segment L1 is inclined with respect to the transport direction dt. Such a situation can occur, for example, when the web 30 moves laterally between the time when the first register mark 202 is printed and the time when the first register mark 204 is printed.
- the calculation unit 28a differs from the case where the angle ⁇ is within the predetermined angle range when the angle ⁇ formed by the first line segment L1 and the second line segment L2 is outside the angle range in the image. Perform the action. For example, when the angle ⁇ is out of the angle range, the calculation unit 28a instructs the control unit 28b to prohibit printing deviation control of the rotary printing press 1.
- the control of the printing misalignment based on the registration mark 200A having an arrangement different from the normal is prohibited, the control of the misprinting that may be erroneous can be suppressed. Accordingly, it is possible to improve the accuracy of printing misalignment control.
- the registration error detection device 100 is applied to the rotary printing press 1 for gravure printing, but the present invention is not limited thereto.
- the registration error detection device 100 can be applied to a rotary printing press for offset printing.
- the rotary printing machine 1 should just be a multicolor rotary printing machine, and is not limited to 4 color printing.
- the registration error can be calculated in the same way as.
- the registration error can be calculated in the same way as.
- the printing misalignment can be corrected in each printing unit 12 based on the registration error calculated based on the first registration marks 202 and 204 printed by the plate cylinder 20 of the same first printing unit 12a.
- the calculation unit 28a may correct the registration error based on the areas.
- the imaging unit 26 is inclined in the transport direction dt with respect to the surface of the web 30, the areas of the two first registration marks 202 and 204 in the image are different from each other.
- the registration error is not accurate. In this modification, a more accurate registration error can be obtained in consideration of the influence of the inclination of the imaging unit 26.
- This invention can be used for a rotary printing press.
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Abstract
Description
図1は、第1の実施形態に係る見当誤差検出装置100を備えた輪転印刷機1を示す図である。図1に示す輪転印刷機1は、被印刷物であるフィルム等のウェブ30に対して4色刷りが可能な多色グラビア輪転印刷機である。
第2の実施形態では、追加の第2見当マークがさらに設けられている点において第1の実施形態と異なる。以下では、第1の実施形態との相違点を中心に説明する。
Claims (12)
- 輪転印刷機の第1の版胴により被印刷物に印刷された第1色の2個の第1見当マークと、前記輪転印刷機の第2の版胴により前記被印刷物に印刷された第2色の第2見当マークとを撮像する撮像部と、
前記撮像部で撮像された画像における前記2個の第1見当マークの間の基準位置と前記第2見当マークに基づく比較位置とを比較する演算部と、
を備えることを特徴とする見当誤差検出装置。 - 前記演算部は、前記基準位置と前記比較位置との間の画素数に基づいて見当誤差を演算する、ことを特徴とする請求項1に記載の見当誤差検出装置。
- 前記演算部は、前記画像における前記2個の第1見当マークのそれぞれの重心間の画素数と、印刷された前記2個の第1見当マークのそれぞれの重心間の既知の距離とに基づいて1画素あたりの距離を演算し、前記1画素あたりの距離と、前記基準位置と前記比較位置との間の画素数との積を前記見当誤差として演算する、ことを特徴とする請求項2に記載の見当誤差検出装置。
- 前記2個の第1見当マークと前記第2見当マークは、前記輪転印刷機における前記被印刷物の搬送方向に沿って配置され、
前記第2見当マークは、前記2個の第1見当マークの間に配置され、
前記演算部は、前記第2見当マークの重心を前記比較位置とする、ことを特徴とする請求項2または3に記載の見当誤差検出装置。 - 前記演算部は、前記画像における前記2個の第1見当マークを通る直線の方向と、当該直線に直交する方向とにおいて前記見当誤差を演算する、ことを特徴とする請求項4に記載の見当誤差検出装置。
- 前記2個の第1見当マークのそれぞれの面積は、前記第2見当マークの面積の実質的に1/2である、ことを特徴とする請求項1から5のいずれかに記載の見当誤差検出装置。
- 前記2個の第1見当マークと前記第2見当マークは、それぞれ円形である、ことを特徴とする請求項1から6のいずれかに記載の見当誤差検出装置。
- 前記撮像部は、前記第2の版胴により前記被印刷物に印刷された前記第2色の追加の第2見当マークをさらに撮像し、
前記2個の第1見当マークを結ぶ第1線分は、前記第2見当マークと前記追加の第2見当マークとを結ぶ第2線分と交差しており、
前記演算部は、前記第2見当マークと前記追加の第2見当マークの重心を前記比較位置とする、ことを特徴とする請求項1から3のいずれかに記載の見当誤差検出装置。 - 前記演算部は、前記画像において前記第1線分と前記第2線分とが成す角度が予め定められた角度範囲外である場合に、前記輪転印刷機の印刷ずれの制御を禁止する、ことを特徴とする請求項8に記載の見当誤差検出装置。
- 輪転印刷機の第1の版胴により被印刷物に印刷された第1色の2個の第1見当マークと、前記輪転印刷機の第2の版胴により前記被印刷物に印刷された第2色の第2見当マークとを撮像し、
撮像された画像における前記2個の第1見当マークの間の基準位置と前記第2見当マークに基づく比較位置とを比較する、ことを特徴とする見当誤差検出方法。 - 輪転印刷機の印刷ずれを制御するための見当マークが印刷された印刷物であって、
被印刷物と、
前記輪転印刷機の第1の版胴により前記被印刷物に印刷された2個の第1色の第1見当マークと、
前記輪転印刷機の第2の版胴により前記被印刷物に印刷された第2色の第2見当マークと、
を備えることを特徴とする印刷物。 - 前記2個の第1見当マークと前記第2見当マークは、前記輪転印刷機における前記被印刷物の搬送方向に沿って配置され、
前記第2見当マークは、前記2個の第1見当マークの間に配置されている、ことを特徴とする請求項11に記載の印刷物。
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