JP5522363B2 - Position shift amount control device and position shift amount control method - Google Patents

Description

  The present invention relates to a positional deviation amount control device and the like for controlling a pattern positional deviation amount of printed matter.

  As a pattern position deviation control method for an offset rotary printing press, a register mark provided on only one of the operation side, drive side, and center part on the web is detected, and the pattern in the transport direction calculated from this register mark position is detected. There is a method of automatically correcting the positional deviation amount and the pattern positional deviation amount in the left-right direction which is a direction perpendicular to the conveying direction. However, since the offset rotary printing press performs printing by attaching a plate-like plate to the plate cylinder of each printing unit, if the plate mounting accuracy is poor at this time, one (for example, the operating side) pattern position in the driving direction. Even if they match, an error may occur in the pattern position on the other side (drive side). Such a pattern position shift is called a pattern position shift in the twist direction. In order to correct the pattern position misalignment in the twist direction, it is necessary for the operator to visually check the printed material and perform manual fine adjustment work. In this case, the pattern position must be adjusted through trial and error. There is a problem that much time is required for alignment.

  Therefore, Patent Document 1 discloses a method for calculating and correcting a twisted pattern position shift.

JP 07-290693 A

  However, when this method is applied to an offset rotary printing press, it is necessary to stop and confirm and adjust the printing press after printing, and cannot always cope with a picture position shift that changes with time. In addition, the vertical direction and the twist direction are closely related, and if the picture position deviation in the twist direction is adjusted, the vertical direction also moves, so that there is a problem that it takes too much time for individual correction for each direction.

  The present invention has been made in view of such problems, and collectively controls the pattern position deviation in the vertical direction, the left-right direction, and the twist direction generated in the printed material, and is designed to be a pattern position deviation that constantly changes over time. An object of the present invention is to provide a positional deviation amount control device and a positional deviation amount control method that can be used.

In order to solve the above-mentioned problem, the invention described in claim 1 is a positional deviation amount control device that corrects a pattern positional deviation amount of a printed matter by a multicolor printing machine, and is a direction perpendicular to the conveyance direction of the printed matter. The captured image data acquisition means for acquiring the captured image data obtained by capturing the image position deviation measurement mark group including the measurement marks of the respective colors, printed on each of the both end portions in the left-right direction, and the captured image data Based on the position of the one measurement mark that is predetermined as a reference measurement mark among the measurement marks of the pattern position deviation measurement mark group at both ends of the printed material, the printed material Measures the positional deviation in the vertical direction, which is parallel to the transport direction, the positional deviation in the horizontal direction, and the positional deviation in the twist direction, which is an oblique direction with respect to the vertical direction and the horizontal direction. A position shift amount calculating means for calculating a pattern position shift amount, and a control means for calculating a position shift correction amount based on the pattern position shift amount and transmitting a correction signal to the printing unit of the multicolor printing machine; It has a camera for capturing the picture position offset measurement marks group, the distance between the paper edge of the printed matter paper edge sensor detects, from a preset the paper end to the picture position offset measurement marks group Based on the above, the image position deviation measurement mark group is moved near the center of the shooting range of the camera, and the captured image data acquisition means is provided on both sides of the front and back sides of the printed matter. Each of the captured image data obtained by capturing the printed image positional deviation measurement mark group is acquired, and the positional deviation amount calculation means is configured to determine the position of the reference measurement mark based on the captured image data. Based on a positional displacement amount control device and calculates the picture position offset quantity including a relative positional deviation of the pattern position of the front and back sides of the printed material.

In order to solve the above-described problem, the invention according to claim 2 is that the printed matter by the multicolor printing machine is a printed matter printed by an offset printing system, and the captured image data acquisition means includes the printed matter of the web. The positional deviation amount control device according to claim 1, wherein the captured image data is acquired by picking up an image with a CCD camera while irradiating the web printed matter with an instantaneous light emitting device while transporting the web.

In order to solve the above-mentioned problems, the invention according to claim 3 is characterized in that when the size of the mark position measurement mark group when the pattern position deviation does not occur is 1.5 mm to 8.0 mm, printed matter transport speed is 600 meters / minute to a 700 meters / min, flash time of the instantaneous light emitting device is a 4 .mu.s, in claim 2 in which the shutter speed of the CCD camera is characterized in that it is a 20ms It is a position shift amount control apparatus of description.

In order to solve the above-mentioned problem, the invention according to claim 4 is a positional deviation amount control method for correcting a picture positional deviation amount of a printed matter by a multi-color printing machine, and the camera performs the positional deviation amount control method with respect to the printed matter conveyance direction. The step of imaging a pattern position measurement mark group consisting of measurement marks for each color printed on both side edges in the horizontal direction, which is the vertical direction, and a position shift amount control device, The acquired image is acquired as captured image data, and based on the captured image data, the measurement mark of the pattern position deviation measurement mark group at both ends of the printed material is determined in advance as a reference measurement mark. Based on the position of the one measurement mark, the positional deviation in the vertical direction, which is parallel to the transport direction of the printed material, the positional deviation in the horizontal direction, the vertical direction and the horizontal direction A positional deviation amount calculating step of measuring a positional deviation in a twist direction that is an oblique direction with respect to the position and calculating a pattern positional deviation amount, and the positional deviation amount control device is based on the pattern positional deviation amount. It calculates the deviation correction amount, wherein the control step of transmitting the printing unit to the correction signal multicolor printing machine, have a, the camera, the paper edge of the printed matter paper edge sensor detects, preset Further, based on the distance from the paper edge to the pattern position deviation measurement mark group, the pattern position deviation measurement mark group is moved near the center of the shooting range of the camera, and the camera The image positional deviation measurement mark group printed on each of the both ends of the front and back surfaces of the printed matter is imaged, and the positional deviation amount control device adds the captured image data to the captured image data in the positional deviation amount calculation step. Base Te, based on the position of the mark for the reference measurement is the positional displacement amount control method characterized by calculating the picture position shift amount including the relative positional deviation of the pattern position of the front and back sides of the printed material .

In order to solve the above-described problem, the invention according to claim 5 is that the printed matter by the multicolor printing machine is a web printed matter printed by an offset printing system, and the camera is a CCD camera, and the CCD 5. The positional deviation amount control method according to claim 4 , wherein the camera picks up an image while irradiating the web printed matter with an instantaneous light emitting device while transporting the web printed matter. 6.

In order to solve the above-mentioned problem, the invention according to claim 6 is characterized in that when the size of the mark position measurement mark group when the pattern position deviation does not occur is 1.5 mm to 8.0 mm, printed matter transport speed is 600 meters / minute to a 700 meters / min, flash time of the instantaneous light emitting device is a 4 .mu.s, in claim 5 in which the shutter speed of the CCD camera is characterized in that it is a 20ms This is the positional deviation amount control method described.

  According to the present invention, the positional deviation correction amount for correcting the vertical position, the horizontal direction and the twist direction of the pattern position generated in the printed matter is calculated at once, and the pattern position shift is automatically performed by feedback control to the printing unit. It can be corrected with.

(A) is a figure which shows the winding paper 1 (web) on which the register mark group LM was printed. FIG. 2B is a schematic diagram illustrating an enlarged portion of the register mark group LM illustrated in FIG. It is explanatory drawing of the register mark group LM. It is explanatory drawing which shows the structure of the offset printing system S in this embodiment. It is a figure which shows an example of the pattern position shift | offset | difference of the surface of a twist direction.

  A preferred embodiment of a positional deviation amount control method according to the present invention will be described below with reference to the accompanying drawings. This embodiment shows an example in which the present invention is applied to an offset printing system.

  FIG. 1A is a view showing a web 1 on which a register mark group LM is printed.

  On the web 1, a pattern, a register mark group LM, a cutting mark, and the like are printed. One end of the web 1 is referred to as an operation side, and the other end is referred to as a drive side, and the register mark group LM has both left and right side ends (operations perpendicular to the conveyance direction of the web 1) (operations). Printing on both the driving side and the driving side). Note that the web 1 is an example of a printed material.

  The register mark group LM includes a vertical displacement that is parallel to the conveyance direction of the web 1, a horizontal displacement of the web 1, and a direction that is oblique to the vertical and horizontal directions. It is a mark for measuring a positional deviation in a certain twist direction, and is an example of a mark position measurement mark group of the present invention. The left-right direction is the width direction of the paper, and is also referred to as a driving direction because it is parallel to a straight line connecting the operating side and the driving side of the offset printing system.

  FIG. 1B is a schematic diagram showing an enlarged portion of the register mark group LM shown in FIG.

  As shown in the figure, the register mark group LM is preferably printed on the outer side of the cut mark of the web 1 and finally printed on the cut portion. The inside of the cutting mark is defined as an effective area, and a predetermined pattern to be finally printed on one printed matter is printed in the effective area.

  Such register mark groups LM are printed at corresponding positions on the front and back sides of the web 1.

  FIG. 2 is an explanatory diagram of the register mark group LM.

  The register mark group LM is composed of register marks Lm for each color printed by each printing unit described later. The register mark group LM in this embodiment includes a cyan register mark Lm (C), a magenta register mark Lm (M), a yellow register register Lm (Y), and a black register (black). Register mark Lm (K). In the following description, any or all of the register marks Lm (C), Lm (M), Lm (Y), and Lm (K) are referred to as register marks Lm.

  Each register mark Lm of the present embodiment is a square having the same size. When the pattern position deviation does not occur, the length B of one side is, for example, about 500 μm both vertically and horizontally, and the distance A between the center of gravity of each register mark Lm is, for example, about 800 μm. The register mark Lm is an example of a measurement mark according to the present invention. Further, in the present embodiment, the register mark Lm is a square, but may have other shapes.

  In the present embodiment, a register mark group LM printed on the web 1 is photographed by a camera, which will be described later, and an image processing apparatus, which will be described later, acquires captured image data of the captured register mark group LM, and registers each register. The coordinates of the mark Lm are measured. In the example shown in FIG. 2, the x direction indicates the pattern position deviation in the left-right direction of the winding paper 1, and the y direction indicates the pattern position deviation in the vertical direction of the winding paper 1.

The example shown in FIG. 2 is a register mark group LM on the driving side of the web 1,
The coordinate value of the center of gravity of the cyan register mark Lm (C) is (Cx, Cy),
The coordinate value of the center of gravity of the magenta register mark Lm (M) is (Mx, My),
The coordinate value of the barycentric point of the yellow register mark Lm (Y) is (Yx, Yy),
The coordinate value of the barycentric point of the black register mark Lm (K) is (Kx, Ky),
And

Further, the register mark group LM on the operation side on the surface of the web 1 is
The coordinate value of the center of gravity of the cyan register mark Lm (C) is (C′x, C′y),
The coordinate value of the center of gravity of the magenta register mark Lm (M) is (M′x, M′y),
The coordinate value of the barycentric point of the yellow register mark Lm (Y) is (Y′x, Y′y),
The coordinate value of the barycentric point of the black register mark Lm (K) is (K′x, K′y),
And

The register mark group LM on the driving side on the back of the web 1 is
The coordinate values of the center of gravity of the cyan register mark Lm (C) are (C _# x, C _# y),
The coordinate value of the center of gravity of the magenta register mark Lm (M) is (M _# x, M _# y),
The coordinate value of the barycentric point of the yellow register mark Lm (Y) is (Y _# x, Y _# y),
The coordinate value of the barycentric point of the black register mark Lm (K) is (K _# x, K _# y),
And

The register mark group LM on the operation side on the back side of the web 1 is
The coordinate value of the center of gravity of the cyan register mark Lm (C) is (C _{# ′} x, C _{# ′} y),
The coordinate value of the center of gravity of the magenta register mark Lm (M) is (M _{# ′} x, M _{# ′} y),
The coordinate value of the barycentric point of the yellow register mark Lm (Y) is (Y _{# '} x, Y _#' y),
The coordinate value of the barycentric point of the black register mark Lm (K) is (K _{# '} x, K _#' y),
And In the present embodiment, the coordinate value of the barycentric point is used to specify the position of the register mark Lm as described above. However, the present invention is not limited to this. For example, an arbitrary vertex of a square (for example, the upper left vertex) ) May be used.

  FIG. 3 is an explanatory diagram showing a configuration of the offset printing system S in the present embodiment.

  The offset printing system S prints a pattern, a register mark group LM, and the like on a web 1 with a double-sided printing processing unit 2 and performs a drying process and a cooling unit (not shown) by a drying processing unit (not shown). A plurality of printed materials are created through a cooling process (not shown), the imaging unit 3, and a cutting / folding processing unit (not shown). The image processing apparatus ST acquires the captured image data Di of the register mark group LM and measures the coordinates of the register mark Lm. The arithmetic processing unit SS receives the coordinate information I of the register mark Lm from the image processing unit ST, automatically calculates the pattern position deviation amount, and transmits a correction signal Ds to the printing unit described later via the cable. The printing unit adjusts the position of the printing unit according to the received correction signal Ds, and corrects the pattern position deviation. The image processing device ST and the arithmetic processing device SS are examples of the positional deviation amount control device of the present invention.

  An operator (administrator) can remotely manage the image processing apparatus ST and the arithmetic processing apparatus SS from the management terminal MT. Specifically, the operator can confirm the image of the captured image data Di using a monitor provided in the management terminal MT. In addition, an operator can start an application of the offset printing system S and can give an operation instruction to the image processing apparatus ST and the arithmetic processing apparatus SS on the application. The management terminal MT transmits the instructed information to the image processing device ST or the arithmetic processing device SS.

  This will be specifically described below.

  The duplex printing processing unit 2 includes printing units 21 for cyan, magenta, yellow, and black. These printing units 21 print colors, register mark groups LM, and the like by sequentially applying colors to the web 1. In order to simplify the illustration, FIG. 3 shows only one register mark group LM on the operation side and the drive side of the surface of the web 1, and omits other illustrations and the register mark group LM. did.

  The printing unit 21 includes an upper cylinder 21a and a lower cylinder 21b. The upper cylinder 21a is composed of a plate cylinder 21a1 and a blanket 21a2, and the lower cylinder 21b is composed of a plate cylinder 21b1 and a blanket 21b2. Printing is performed on the surface of the web 1 by the upper cylinder 21a, and printing is performed on the back surface of the web 1 by the lower cylinder 21b.

  In the imaging unit 3, each register mark group LM of the winding paper 1 is imaged by cameras R 1, R 2, R 3, and R 4 such as a CCD camera while the winding paper 1 is conveyed. At this time, a captured image as a still image is obtained using an instantaneous light emitting device (strobe) as the light source 31. The camera R1 images the drive side register mark group LM on the surface of the web 1, the camera R2 images the operation side register mark group LM on the surface of the web 1, and the camera R3 The operation side register mark group LM on the back side of the paper 1 is imaged, and the camera R4 images the drive side register mark group LM on the back side of the winding paper 1. In the following description, any or all of the cameras R1, R2, R3, and R4 are referred to as a camera R. The camera R is connected to a traverser (not shown) for controlling the movement of the camera R in the left-right direction.

  In addition, a paper edge sensor 32 is provided near both ends of the web 1. The paper edge sensor 32 is for detecting the paper edge of the web 1. When the paper edge sensor 32 detects the paper edge of the web 1, the paper edge sensor 32 transmits a paper edge detection signal Dd to the arithmetic processing unit SS via the cable. The arithmetic processing unit SS stores in advance the distance of the register mark group LM from the paper edge of the web 1 and registers the register mark group near the center of the photographing range of the camera R based on the received paper edge detection signal Dd. The position of each camera R is determined so that the LM is located. Then, the processing unit SS transmits the determined position designation signal Da to the traverser. The traverser moves each camera R according to the received position designation signal Da. In order to simplify the illustration, the paper edge sensor and the light source provided on the back surface of the web 1 are not shown.

  The four cameras R1 to R4 respectively photograph the corresponding register mark group LM and transmit the captured image data Di to the image processing device ST. Then, the image processing apparatus ST measures the coordinates of the register mark Lm from each received captured image data Di and transmits the coordinates as coordinate information I to the arithmetic processing apparatus SS.

  The arithmetic processing unit SS automatically calculates the pattern position deviation amount based on the coordinate information I. Specifically, the amount of pattern position shift is 16 register marks Lm in total (four register marks Lm on the front side operation side of the web 1, four register marks Lm on the back side operation side, four registers on the front side drive side) Of the four register marks Lm on the mark Lm and the back side drive side), one register mark Lm is used as a reference, and the deviation from the reference register mark Lm is obtained. In the present embodiment, the reference register mark Lm is the magenta register mark Lm (M) on the surface driving side, and the distance difference between the register mark Lm (M) and the other register mark Lm is calculated as the pattern position deviation amount. . An example of calculating each picture position shift amount is shown below.

(1) Calculation of pattern position shift amount in the vertical direction Calculation of the pattern position shift amount in the vertical direction will be described.

(1-1) Vertical Surface The vertical position of the black register mark Lm (K) on the surface driving side (Ky (zure)) is the y coordinate of the barycentric point of the black register mark Lm (K). Based on the value (Ky), the y-coordinate value (My) of the center point of the register mark Lm (M) on the surface driving side that is the reference register mark Lm, and the distance A of the center point of each register mark Lm, It calculates | requires by following formula (1).
My−Ky−A = Ky (zure) (1)

Similarly, Cy (zure) is the vertical position of the cyan register mark Lm (C) on the front side, and the vertical position of the yellow register mark Lm (Y) is on the front side. Yy (zure) is used, and the respective pattern position deviation amounts are obtained by the following equations (2) and (3).
My−Cy = Cy (zure) (2)
My−Yy−A = Yy (zure) (3)

(1-2) Top-and-bottom direction back side Similarly, the pattern position shift in the top-and-bottom direction is calculated for the back side. Specifically, the pattern position shift amount of each register mark Lm on the back surface drive side is expressed by the following formulas (4) to (7) based on the reference register mark Lm (magenta register mark Lm (M) on the front surface drive side). Ask. The vertical position of the cyan register mark Lm (C) on the back side driving side is C _# y (zure), and the vertical position of the magenta register mark Lm (M) on the back side driving side is shifted. M _# y (zure), and the vertical position of the yellow register mark Lm (Y) on the back side drive side is Y _# y (zure) The vertical direction of the black register mark Lm (K) on the back side drive side Is set to K _# y (zure). Based on the pattern position deviation M _# y (zure) of the magenta register mark Lm (M) on the back surface driving side calculated by the expression (4), the other register marks Lm of the expressions (5) to (7) The pattern position deviation is calculated.
My-M _# y = M _# y (zure) (4)
My-C _# y-M _# y (zure) = C _# y (zure) (5)
My-Y _# y-A-M _# y (zure) = Y _# y (zure) (6)
My-K _# y-AM _# y (zure) = K _# y (zure) (7)

(2) Calculation of pattern position shift amount in twist direction Calculation of the pattern position shift amount in the twist direction will be described.

  Generally, the drive side of the plate cylinders 21a1 and 21b1 of the printing unit 21 is fixed, and only the operation side can be controlled. In other words, the twist position shift is caused by control of the twist direction on the operation side of the plate cylinders 21a1 and 21b1 of the printing unit 21. Therefore, the pattern position shift in the twist direction is calculated as a shift on the operation side with respect to the drive side. Note that the drive side of the plate cylinders 21a1 and 21b1 is not fixed and is not limited to this when control is possible.

(2-1) Twist direction surface The pattern position shift amount of each register mark Lm on the surface operation side is obtained by the following formulas (8) to (11). It should be noted that the pattern position deviation amount in the twist direction of the cyan register mark Lm (C) on the surface operation side is C ′ (hineri), and the image position deviation amount in the twist direction of the magenta register mark Lm (M) on the surface operation side is M ′ (hineri), Y ′ (hineri) is the amount of pattern displacement in the twist direction of the yellow register mark Lm (Y) on the surface operation side, and the image in the vertical direction of the black register mark Lm (K) on the surface operation side The positional deviation amount is K ′ (hineri).
Cy−C′y = C ′ (hineri) (8)
My−M′y = M ′ (hineri) (9)
Yy−Y′y = Y ′ (hineri) (10)
Ky−K′y = K ′ (hineri) (11)

  FIG. 4 is a diagram illustrating an example of a pattern position shift on the surface in the twist direction. The example shown in the figure is an example in the case where the pattern position shift occurs only in the yellow register mark Lm (Y). The register mark Lm (Y) on the operation side is shifted from the register mark Lm (Y) on the driving side by an amount Y ′ (hineri) of the pattern position.

(2-2) Twist direction back side Similarly, about the back side, the pattern position shift | offset | difference of a twist direction is calculated | required by following formula (12)-(15). Note that the pattern position deviation amount in the twist direction of the cyan register mark Lm (C) on the back operation side is C ′ (hineri), and the image position deviation amount in the twist direction of the magenta register mark Lm (M) on the back operation side is M ′ (hineri), Y ′ (hineri) is the pattern displacement amount in the twist direction of the yellow register mark Lm (Y) on the back operation side, and the top and bottom pattern of the black register mark Lm (K) on the back operation side The positional deviation amount is K ′ (hineri).
C _# y-C _# 'y = C _# ' (hineri) (12)
M _# y-M _# 'y = M _# ' (hineri) (13)
Y _# y-Y _# 'y = Y _# ' (hineri) (14)
K _# y-K _# 'y = K _# ' (hineri) (15)

(3) Calculation of left and right pattern position displacement amount Calculation of the left and right pattern position displacement amount will be described.

(3-1) Left and right direction surface The x position of the center of gravity of the register mark Lm (M) on the surface driving side which is the reference register mark Lm is the coordinate value of the pattern position displacement in the left and right direction of each register mark Lm on the surface ( Based on (Mx), the following formulas (16) to (18) are used. It should be noted that the pattern displacement amount in the left-right direction of the cyan register mark Lm (C) on the front surface is C (sayu), and the image position displacement amount in the left-right direction of the yellow register mark Lm (Y) on the front surface is Y (sayu). Let K (sayu) be the amount of pattern position deviation in the left-right direction of the black register mark Lm (K) on the surface.
((Mx−Cx) + (M′x−C′x)) ÷ 2 = C (sayu) (16)
((Mx−Yx) + (M′x−Y′x)) ÷ 2 = Y (sayu) (17)
((Mx−Kx) + (M′x−K′x)) ÷ 2 = K (sayu) (18)

(3-2) Left and right direction rear surface The amount of pattern position deviation in the left and right direction of each register mark Lm on the back surface is expressed by the x-coordinate value of the barycentric point of the magenta register mark Lm (M) on the front surface driving side which is the reference register mark Lm ( Based on (Mx), the following formulas (19) to (22) are used. The left and right pattern position deviation amount of the front cyan register mark Lm (C) is C _# (sayu), and the left and right pattern position deviation amount of the magenta register mark Lm (M) is M _# (sayu). ), Y _# (sayu) is the horizontal position of the yellow register mark Lm (Y) on the front surface, and K _# (sayu) is the horizontal position of the black register mark Lm (K) on the front surface. ). In equation (19), the pattern position deviation of the back side magenta, which is the reference for the right and left direction picture position deviation of the back side, is calculated.
((M _# x-M _# x) + (M'x-M _{# '} x)) / 2 = M _# (sayu) (19)
_{((M ♯ x-C ♯} x) + (M ♯'x-C ♯'x)) ÷ 2 = C ♯ (sayu) ··· formula (20)
((M _# x-Y _# x) + (M'x-Y _{# '} x)) / 2 = Y _# (sayu) (21)
((M _# x-K _# x) + (M'x-K _{# '} x)) / 2 = K _# (sayu) (22)

  The arithmetic processing unit SS calculates the amount of positional deviation correction for each color in a lump after calculating the amount of pattern positional deviation in the vertical direction, twist direction, and left-right direction. Then, the arithmetic processing unit SS generates a correction signal Ds for controlling the corresponding printing unit 21 based on each calculated positional deviation correction amount. Then, the arithmetic processing unit SS transmits the generated correction signal Ds to each printing unit 21. Each printing unit 21 adjusts the position of each plate cylinder 21a1, 21b1 according to the received correction signal Ds to correct the pattern position deviation.

  As described above, according to the present embodiment, register mark groups LM are provided at both end portions of the web 1, and each register mark group LM is based on captured image data Di obtained by imaging with the camera R. Of the register marks Lm that constitute the register mark group LM, one register mark is used as a reference color to calculate the image position misalignment amount in the vertical direction, twist direction, and left / right direction, and the misalignment correction amount is calculated for each color collectively. Configured to do. Then, the arithmetic processing unit SS generates a correction signal Ds based on the misregistration correction amount and transmits it to each printing unit 21, and adjusts the position of each plate cylinder 21a1, 21b1 according to the correction signal Ds received by each printing unit 21. Configured to do. As a result, it is possible to collectively calculate a positional shift correction amount for correcting the pattern position shift in each direction (top, bottom, left and right, twist), and to automatically correct the pattern position shift by feedback control to the printing unit 21. it can. In addition, it is possible to reliably control and correct the pattern position deviation that always changes over time.

  Further, register mark groups LM are provided at both end portions on the front and back sides of the web 1 so that each captured image data Di can be acquired. It is possible to collectively calculate and collectively correct the pattern position deviation amount in the direction, twist direction, and left-right direction.

  Through experimentation, a pattern positional deviation of about 1 μm was measured under all the following conditions, and correction control was possible.

Condition 1: The length B of one side of the square of the register mark Lm is about 500 μm, and the distance A between the center of gravity of each register mark Lm is about 800 μm when there is no pattern position deviation.
Condition 2: The conveyance speed of the web 1 is about 600 m / min to 700 m / min. Condition 3: The flash time of the light source 31 is about 4 μs.
Condition 4: Camera R shutter speed is 20 ms

  The above conditions can be changed as appropriate. For example, the size of the register mark group LM when the pattern position deviation does not occur may be about 1.5 mm to 8.0 mm.

  In the above-described embodiment, the four register mark groups LM provided on both end portions on the front and back sides of the web 1 are set as one set, and the pattern position deviation amount is measured and feedback control is performed for each set. You may comprise so that it may control for every set. For example, when the pattern position deviation amount for 10 sets is measured and 10 pattern position deviation amounts are obtained, the average value or the average value based on the moving average may be used as the pattern position deviation amount. In addition, the maximum value and the minimum value of the pattern position deviation amount measured at this time may not be calculated. According to this, the amount of pattern position deviation can be obtained with higher accuracy. In this case, the operator designates the number of measurements, the average value method, and the like on the application of the management terminal MT. Then, the management terminal MT transmits instruction information such as the number of measurements designated by the arithmetic processing unit SS and an average value method. The arithmetic processing unit SS calculates the pattern position deviation amount according to the received instruction information.

  In the above embodiment, the image processing device ST and the arithmetic processing device SS have been described as examples of the positional deviation amount control device of the present invention. However, only the arithmetic processing device SS can be used as an example of the positional deviation amount control device of the present invention. Good. In this case, the arithmetic processing unit SS receives the captured image data Di from the camera R, and the arithmetic processing unit SS measures the coordinates of the register mark Lm to obtain the coordinate information I.

  Furthermore, in the said embodiment, after printing in the double-sided printing process part 2, after passing through a drying process part (not shown) and a cooling part (not shown), it described that imaging was performed with the camera R, The present invention is not limited to such a configuration, and may be applied to inspection in a wet state by performing imaging with the camera R after printing in the duplex printing processing unit 2 and before drying and cooling. Is possible.

  In the above embodiment, the case where the present invention is applied to the offset printing system S has been described. However, the present invention can also be applied to other printing methods such as gravure printing.

DESCRIPTION OF SYMBOLS 1 Winding paper 2 Duplex printing process part 21 Printing unit 21a Upper cylinder 21a1 Plate cylinder 21a2 Blanket 21b Lower cylinder 21b1 Plate cylinder 21b2 Blanket 3 Image pick-up part 31 Light source 32 Paper edge sensor R (R1, R2, R3, R4) Camera LM register Mark Lm (Lm (C), Lm (M), Lm (Y), Lm (K)) Register mark ST Image processing device SS Arithmetic processing device Dd Paper edge detection signal Da Position designation signal Ds Correction signal Di Captured image data I Coordinate information

Claims (6)

A misregistration amount control device that corrects a pattern misregistration amount of a printed matter by a multicolor printer,
Captured image data that captures captured image data obtained by capturing a pattern position measurement mark group made up of measurement marks for each color, printed on each side edge in the left-right direction, which is perpendicular to the transport direction of the printed material Data acquisition means;
Based on the position of one of the measurement marks predetermined as a reference measurement mark among the measurement marks of the pattern position deviation measurement mark group on both side edges of the printed material based on the captured image data. A positional deviation in a vertical direction that is a direction parallel to the transport direction of the printed material, a positional deviation in the left-right direction, and a positional deviation in a twist direction that is oblique to the vertical direction and the left-right direction; A positional deviation amount calculating means for calculating the pattern positional deviation amount by measuring
Control means for calculating a positional deviation correction amount based on the pattern positional deviation amount and transmitting a correction signal to a printing unit of the multicolor printing machine;
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The camera that captures the pattern position deviation measurement mark group is based on a paper edge of the printed matter detected by a paper edge sensor and a preset distance from the paper edge to the pattern position deviation measurement mark group. , Moved so that the mark position measurement mark group is located near the center of the shooting range of the camera,
The captured image data acquisition means respectively acquires the captured image data obtained by capturing the pattern position deviation measurement mark group printed on each of both end portions of the front surface and the back surface of the printed matter,
The positional deviation amount calculation means calculates the pattern positional deviation amount including a relative positional deviation between the pattern positions of the front surface and the back surface of the printed material based on the position of the reference measurement mark based on the captured image data. A positional deviation amount control device characterized by calculating . The printed matter by the multicolor printing machine is a web printed matter printed by an offset printing system,
2. The captured image data acquisition unit acquires the captured image data by capturing an image with a CCD camera while irradiating the web print with an instantaneous light emitting device while transporting the web print. Position shift amount control device. When the size of the mark position measurement mark group when the pattern position deviation does not occur is 1.5 mm to 8.0 mm,
The conveyance speed of the printed web is 600 m / min to 700 m / min,
The flash time of the instantaneous light emitting device is 4 μs,
3. The positional deviation amount control device according to claim 2, wherein the shutter speed of the CCD camera is 20 ms . A positional deviation amount control method for correcting a pattern positional deviation amount of a printed matter by a multicolor printing machine,
A step of imaging a pattern position measurement mark group consisting of measurement marks of each color, printed on each of both side edges in the left-right direction, which is a direction perpendicular to the conveyance direction of the printed material, by a camera;
A positional deviation amount control device acquires the captured image from the camera as captured image data, and based on the captured image data, for the measurement of the pattern positional deviation measurement mark group at both ends of the printed matter Among the marks, based on the position of one of the measurement marks that is predetermined as a reference measurement mark, a positional shift in the vertical direction that is parallel to the transport direction of the printed material, and a positional shift in the left-right direction A positional deviation amount calculating step of measuring a positional deviation in a twist direction that is an oblique direction with respect to the vertical direction and the horizontal direction, and calculating a pattern positional deviation amount;
The positional deviation amount control device calculates a positional deviation correction amount based on the pattern positional deviation amount, and transmits a correction signal to a printing unit of the multicolor printing machine;
Have
The camera is located near the center of the shooting range of the camera based on the paper edge of the printed matter detected by the paper edge sensor and a preset distance from the paper edge to the pattern position deviation measurement mark group. Moved so that the mark position measurement mark group is located,
The camera images the pattern position deviation measurement mark group printed on each of both side edges of the front and back surfaces of the printed matter,
The positional deviation amount control device, in the positional deviation amount calculation step, based on the captured image data, based on the position of the reference measurement mark, relative positional deviation between the pattern positions on the front surface and the back surface of the printed matter. A positional deviation amount control method, comprising: calculating the pattern positional deviation amount including. The printed matter by the multicolor printing machine is a web printed matter printed by an offset printing system,
5. The positional deviation amount control according to claim 4, wherein the camera is a CCD camera, and the CCD camera captures an image while irradiating the web printed material with an instantaneous light emitting device while transporting the web printed material. Method. When the size of the mark position measurement mark group when the pattern position deviation does not occur is 1.5 mm to 8.0 mm,
The conveyance speed of the printed web is 600 m / min to 700 m / min,
The flash time of the instantaneous light emitting device is 4 μs,
6. The positional shift amount control method according to claim 5, wherein the shutter speed of the CCD camera is 20 ms .

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