JPH0848028A - Misregister detection method and apparatus in multicolor rotary press and register adjusting automatic controller - Google Patents

Abstract

PURPOSE:To obtain an accurate misregister by a relatively small and ordinary register mark in a multicolor rotary press. CONSTITUTION:The register marks each having a material or immaterial inherent reference point printed on running paper 1 by printing parts 18-1-18-4 and a circular image sensor 3-1 wherein a plurality of detection elements capable of detecting one register mark all at once are circularly arranged are provided and an image sensor camera 13-1 is provided so as to be capable of corresponding to the printing position of each of the register marks and the circular image sensor 3-1 is scanned in the timing related to the rotation of the printing parts 18-1-18-4 to take in pixel data. An operation means 87 operating the coordinates positions of the reference points of the register marks and the deviation to the coordinates positions should be present of the reference points in the coordinates wherein the center of the circular image sensor 3-1 is set to the origin on the basis of the pixel data is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a register error of a register mark printed by each printing section, a device for detecting a register error, and a method for detecting a register error in a multi-color printing press. The present invention relates to a register adjustment automatic control device for register adjustment control performed to eliminate register errors.

[0002]

2. Description of the Related Art In a multi-color printing machine, a desired color image cannot be obtained unless the printing positions for the respective colors are aligned. Therefore, an error in the printing register for each color is detected and the registration is made to eliminate this error. I am trying to adjust.

A method and an apparatus for detecting a registration error in multicolor printing and a registration adjustment for eliminating the detected error are described in a type for detecting a register mark printed on a sheet and a type for detecting a registration mark on a plate cylinder. There is a type that detects a register mark. Similar to the present invention, as a type for detecting a register mark printed on a sheet, there are Japanese Patent Laid-Open Nos. 63-22651, 62-234934, 62-231755 and 62-231755. 58-
What is disclosed in Japanese Patent No. 217362 is publicly known.

[0004] The technical content disclosed in Japanese Patent Application Laid-Open No. 63-22651 is that image data substantially equivalent to two-dimensional scanning is obtained by performing one-dimensional scanning of a rhombic mark printed by each printing unit at a plurality of locations. After obtaining this image data in the memory sequentially, calculate the coordinates of the upper and lower vertices of each mark, calculate the coordinates of the center of the mark from the coordinates of the upper and lower vertices, and further calculate the coordinates of the calculated center. Is compared with predetermined coordinates that have already been registered to calculate a register error, and to correct the register error, to perform register adjustment on the top, bottom, left and right. The coordinates of the vertices are determined by averaging.

The technical content disclosed in Japanese Patent Application Laid-Open No. 62-234934 relates to a method for detecting a registration error in a vertical direction, in which a register mark of each printing section is set to a side orthogonal to the moving direction of the running paper and an oblique side. Formed by a pair of triangles having
Each mark is arranged side by side in the traveling direction of the traveling paper, and the marks are sequentially photoelectrically detected by one detector according to the traveling of the traveling paper, and the center of each mark and the distance from the reference position to the center are determined. This is a method of obtaining a registration error in the up-down direction by comparing the obtained distance with a predetermined distance.

The technical content disclosed in Japanese Patent Application Laid-Open No. 62-231755 relates to a method of detecting a register error in the right and left direction. Formed by a pair of triangles having
Each mark is arranged side by side in the traveling direction of the traveling paper, and this mark is sequentially and photoelectrically detected by one detector according to the traveling of the traveling paper, and the distance between the orthogonal side and the hypotenuse is calculated for both of a pair of triangles of each mark. In addition, a difference between the obtained intervals of the triangles is obtained, and a registration error in the left-right direction is obtained from the value of the difference.

Japanese Patent Application Laid-Open No. 58-217362 discloses a technique disclosed in Japanese Patent Application Laid-Open No. 58-217362. A predetermined print field in which a plurality of lines are overprinted is provided at a plurality of locations separated for each comparative color, and each print field is irradiated with electromagnetic energy (usually visible, infrared, or ultraviolet light), and from each print field, The amount of reflected energy is sensed to determine the difference in the proportion of the non-printing area of each print field, and from the proportion, the registration error in the direction perpendicular to the line of each print field, that is, in the vertical or horizontal direction. Further, the difference in the ratio of the non-printing area between the printing fields of the same comparative color at the isolated positions is obtained, and the registration error in the skew direction of the body, that is, the twisting direction is obtained from the difference. Was in order to eliminate the registration error, heaven and earth,
This is a device for performing register adjustment in the left, right, and twist directions.

[0008]

The objects disclosed in the above publications have the following drawbacks. That is, the one disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 63-22651 has a disadvantage that the accuracy of detecting a register error is reduced when the printing speed is increased or decreased, and therefore the accuracy of register adjustment is reduced. That is, one-dimensional scanning by the CCD is started with a signal related to the phase of the plate cylinder rotation, and subsequently the above-mentioned scanning is repeated every 26 μs based on a clock signal, the number of times of scanning is counted, and the scanning is continued. For calculating the coordinate in the running direction (top-bottom direction) of the running paper when the CCD scans and detects the register mark by dividing the rotational circumference of the plate cylinder by the number of scans above to obtain the pitch for each scan. Since it is used for printing, for example, in newspaper printing, the printing speed is 1 second per second.
If the speed is increased / decreased to 10,000 copies / hour, the running speed of the running paper at this time increases or decreases by 760 mm / s, which is 26 μs which is the scanning cycle.
A variation of about 20 μm will occur between them, and the above-mentioned coordinates will be inaccurate accordingly, and the accuracy of register error detection and register adjustment accuracy in the vertical direction will be reduced.

Further, although each scanning is performed in one dimension, scanning is repeated a plurality of times for each register mark to capture image data of an amount substantially equivalent to two-dimensional scanning, and arithmetic processing is performed on this to register. Since the error is detected, a corresponding processing time is required and the burden on the calculation means is large.

The ones disclosed in Japanese Patent Laid-Open Nos. 62-234934 and 62-231755 require register marks composed of two triangles, and the register marks inevitably become large and printing This is contrary to the user's desire for the smallest possible register mark due to surface expansion requests. In addition, the detection accuracy cannot be increased unless the spot diameter of the light beam applied to the paper surface is reduced. That is, the detection accuracy is 10
It must be less than μm, and an expensive device is required.

Further, since the method of irradiating a light beam is used, the photoelectric device must be disposed close to the traveling paper in order to improve the detection efficiency, which is disadvantageous in the paper threading and maintenance work.

The one disclosed in Japanese Patent Laid-Open No. 58-217362 is an overlapping print of parallel lines (register mark) for detecting a register error in the vertical direction and an overlap of parallel lines for detecting a register error in the horizontal direction. Printing (register mark)
Cannot be shared, and it is necessary to separately provide print fields for these register marks.
As in the case of Japanese Patent Application Laid-Open No. 934 and No. 62-231755, it is against user demand.

Further, since the amount of electromagnetic energy (normally visible light, infrared light, or ultraviolet light) applied to the overprinted field is reflected from the above field to detect the registration error, printing is performed. It is necessary to select the frequency of the electromagnetic energy to be used in consideration of the color and the background color of the printing material, and in some cases, it is necessary to provide an electromagnetic energy irradiation means and / or detection means.

An object of the present invention is to solve the above-mentioned drawbacks, and it is possible to use a relatively small register mark in detecting the register error, and the register error detection accuracy is high, and therefore the register adjustment accuracy is also high. It is an object of the present invention to provide a register error detecting method, a register error detecting device, and a register adjusting automatic control device which are relatively inexpensive and easy to handle in a multi-color rotary press which becomes higher in height.

[0015]

In order to solve the above-mentioned problems, a register error detecting method in a multi-color rotary press of the present invention has at least one register mark having a unique reference point on a running paper for each printing section. Image sensor in which a plurality of detection elements are arranged in a circle while scanning is performed.The circular image sensor of the camera is scanned to detect the pixel data of each register mark, and the detection is made with the coordinates with the center of the circular image sensor as the origin. Calculate the coordinate position of the above reference point for each register mark from the pixel data
The feature is that the deviation of the reference point from the desired coordinate position is obtained and the register error in the multi-color printing press is detected.

The register mark having the unique reference point has a tangible reference point in which at least two lines intersect in a predetermined relationship or an intangible reference point determined in a predetermined relationship. Shape is used.

Further, the coordinate position where the reference point of each register mark should exist is predetermined for each register mark, and the coordinate position where the reference point of each register mark should exist is the reference point of a predetermined register mark. It may be determined based on the coordinate position of.

Further, in calculating the coordinate position of the reference point, the average value of the first pixel number of the line forming the register mark that changes from light to dark and the last pixel number of the line that changes from dark to light is calculated as the line. The center line position of.

A register error detecting device in a multi-color rotary press according to the present invention includes a register mark printed on a running paper by each printing unit and having a tangible or intangible unique reference point, and a register mark.
Equipped with a circular image sensor in which multiple detection elements are arranged in a circle so that one register mark can be detected simultaneously, and an image sensor camera provided corresponding to the printing position of the register mark and the rotation of the printing unit are associated. Scanning start signal generating means for outputting a scanning start signal of the circular image sensor at a timing, and taking in pixel data detected by the circular image sensor by scanning start,
Coordinates with the center of the circular image sensor as the origin, including a coordinate position of the reference point of the register mark and a calculating means for calculating a deviation from the coordinate position of the reference point,
The feature is that the register error in the multi-color rotary press is detected.

The register error detecting device may include a deviation calculated by the calculating means and a display means for displaying the deviation when the deviation exceeds a predetermined value and cannot be adjusted. The automatic register adjustment control device in the multi-color rotary press of the present invention is a multi-color rotary press having an adjusting means for adjusting the phase of the plate cylinder of the printing section, in which the printing paper is printed by each printing section on a running paper, and a tangible or intangible unique reference point. A register mark having a, a circular image sensor in which a plurality of detection elements are arranged in a circle so that the register marks can be detected all at once, an image sensor camera provided corresponding to the printing position of the register mark, and rotation of the printing unit. A scan start signal generating means for outputting a scan start signal of the circular image sensor at the associated timing, and pixel data detected by the circular image sensor when scanning is started are taken in, and the register mark is a coordinate with the center of the circular image sensor as the origin. The coordinate position of the reference point of the And a registration signal output means for outputting an adjustment signal to the register adjusting means for adjusting the phase of the plate cylinder of the printing unit based on the deviation calculated by the calculating means. And is characterized in that the register error in the multi-color rotary press is automatically adjusted.

[0021]

With the coordinates with the center of the circle of the circular image sensor as the origin, the coordinates of the positions of two or more different lines detected by the circular image sensor are obtained for one of the register marks having a unique reference point. . Based on the coordinates of the positions of the two or more lines, the coordinate position of the reference point of the register mark is calculated, and the original coordinate position of the reference point is compared with the coordinate position calculated. , The deviation is calculated as a registration error.

The adjustment signal output means generates an adjustment signal for adjusting the phase of the plate cylinder based on this registration error, and causes each printing section of the multicolor printing press to automatically perform the registration adjustment operation.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a layout view of an embodiment of a register mark according to the present invention. The registration mark 2 is printed in the order of black, cyan, magenta, and yellow on the leading edge and the trailing edge of the printed image on a straight line with respect to the running direction of the running paper 1. The distances between the register marks of the same color, that is, black L1, cyan L2, magenta L3, and yellow L4 are all equal. The two register marks 2 are arranged in order to detect the twist of each printing plate, and the paper width L0 is the printing plate L with the point A as the fulcrum and the point B as the vertical direction. Has a structure that can be moved. If twisting occurs, adjust either upward or downward. The top, bottom, left and right, and the twist are detected by using the register mark 2. The method of detecting the top, bottom, left and right, and the twist will be described later.

FIG. 2 shows a diagram for explaining the relationship between the circular image sensor and the register mark. In the circular image sensor 3 used in the present invention, an array of light receiving elements composed of 720 pixels is arranged in a circle as shown in FIG. 1A, and the center of the circular image sensor 3 and the registration mark 2 are unique. In the state where the reference point, that is, the intersection point, of the registration mark 2 coincides with the array of the light receiving elements on the right side of the side perpendicular to the traveling direction of the running paper 1, the intersection number is 0 °, and the array number of the light receiving element is That is, the pixel number is assigned as 1. Then counterclockwise 0 °, 90 °, 180
Pixel numbers from the second to the 720th are sequentially assigned to the array at °, 270 °, and 359.5 °.

As shown in FIG. 3B, the register mark 2 to be printed has, for example, a line (hereinafter referred to as a "bar" to avoid confusion) 2-1 having a width of 0.2 mm. 2x
It is printed on a 4.2 mm cross, while the detection area of the circular image sensor 3 is set to 4 mm in diameter.

The usual offset rotary press has a maximum vertical displacement of 2.5 mm, a maximum horizontal displacement of 2.5 mm, and a maximum twist of 0.3 mm. Therefore, the registration mark 2 must be within the detection area of the circular image sensor 3 even if the maximum deviation occurs, and if the registration mark 2 is within the maximum deviation, the circular image sensor 3 To be detected.

FIG. 3 is a diagram for explaining the displacement between the right and left of the register mark and the top and bottom. (A) shows black, (B) shows cyan, (C) shows magenta, and (D) shows the left and right of the yellow dragonfly mark, and the top-bottom deviation, that is, the intersection of the black dragonfly mark 2 of (A), that is, The unique reference point (hereinafter, this intersection of the register marks 2 is referred to as a reference point) is displaced from the basic position of the circular image sensor 3, that is, the center a of the circle to the point a '. Similarly, the cyan register mark 2 in (B) is displaced from the center b of the circle of the circular image sensor 3 to the point b ′, and the magenta register mark 2 in (C) is shown.
Indicates that the center c of the circle of the circular image sensor 3 is displaced from the point c ', and the yellow registration mark 2 in (D) is displaced from the center d of the circle of the circular image sensor 3 to the point d'. ing.

FIG. 4 shows a twisting explanatory view. The registration mark mark 2 on the same printing plate to be printed on a straight line corresponding to the traveling direction of the traveling paper 1 is the registration mark mark 2 on the upper surface of the plate.
On the other hand, the lower part of the register mark 2 has a left or right displacement, and in this case, the printing plate or the image on the printing plate mounted on the plate cylinder is twisted, that is, inclined with respect to the axis of the plate cylinder. Is waking up. These can similarly occur in each plate, black, cyan, magenta, and yellow. In the figure, d1 and d2 represent shift amounts.

Next, a method of detecting the amount of vertical displacement and the amount of plate twist will be described. FIG. 5 shows an explanatory diagram for detecting the amount of vertical displacement. In the figure, when the circular image sensor 3 detects the registration mark 2, the intersections a and c between the circular image sensor 3 and the registration mark 2 are coordinates with the center of the circular image sensor 3 as the origin when there is no twist. (Hereafter, the coordinates are for this circular image sensor 3
The coordinate of the center of the circle image sensor 3 indicates the angle of the center coordinates of the circle image sensor 3, and the circle image sensor 3 calculates ∠abd (from the pixel number allocated in FIG. 2A). θ1) and ∠cbd (θ
2) can be read.

Therefore, the amount of deviation of the register mark 2 from the right and left can be obtained by obtaining the coordinate position of the reference point of the register mark 2. That is, the coordinate position (x,
y) is obtained by x = r · cos θ1 and y = sin θ2. r represents the radius of a circle in which the array of light receiving elements of the circular image sensor 3 is arranged in a perfect circle.

FIG. 6 shows an explanatory diagram for detecting the twist amount of the plate. In the figure, the first black dragonfly mark 2
The black register mark 2 on the rear side is in a twisted state, and when the position of the register mark 2 on the rear side is displaced from the set line to be n2, the twist amount D of the plate is D
= L0 · tan θ1 Here, L0 is the paper width in FIG. 1, tan θ1 = d2 / L1, and L1 is the fixed print length.

When the position of the rear register mark 2 is displaced from the set line by n1, the twist amount D of the plate is D = L.
It is calculated by 0 · tan (180 ° −θ2). In correcting the amount of twist of the plate, L0 is configured such that one of the plate cylinders serves as a fulcrum and the other rotates. Dragonfly mark 2 is n
When it is shifted to the 2 side, the twist amount D is corrected in the top direction, and when the register mark 2 is shifted to the n1 side, the twist amount D is corrected to the ground direction.

FIG. 7 shows another detection explanatory diagram of the plate twist amount. In the figure, the circle of the circular image sensor 3 is used. As shown in the figure, the bar 2-1 of the register mark 2 is twisted diagonally at the intersection of the circular image sensor 3 and the points a and c. In this case, ∠cdb is a double angle of ∠cab, and the register mark 2 orthogonal to the traveling direction of the traveling paper 1 has the θ / 2 twist shown in FIG. Therefore, the twist amount D of the plate is D = L0 · tan θ / 2
Is required.

In this method, the register mark 2 on the top of the plate is 1
It can be detected only by individual pieces. FIG. 9 shows an explanatory diagram of detection of a register mark bar. When the register mark 2 is printed, if the register mark 2 is thick or thin due to the dot gain, the detection accuracy is affected. The first bright pixel number n1 (n1 is a general number, hereinafter n2, etc. is also a general number) that changed from bright to dark and the last dark pixel number that changed from dark to bright so as not to affect the detection accuracy. n2 is detected, the average (n1 + n2) / 2 pixel number is obtained, and the pixel number of the center line position of the bar 2-1 of the register mark 2 is set as the pixel number to eliminate the influence when obtaining the intersection of the register mark 2. I have to. The pixel numbers of the center line positions of n3 and n4, n5 and n6, n7 and n8 of FIG.

Registration mark 2 and circular image sensor 3
Pixels in the Y direction at the time of alignment with or near the alignment are not shown because they extend over the first quadrant and the fourth quadrant of the coordinates with the center of the circular image sensor 3 as the origin, but n2 and n9 ( For n9, a pixel number corresponding to 1/2 of the first bright pixel number which changed from light to dark in the fourth quadrant) is obtained and set as the center line position.

FIG. 10 and FIG. 11 are explanatory views showing a pattern in which the circular image sensor captures the image of the register mark. There are 21 patterns in which the register mark 2 crosses the pixel of the circular image sensor 3.
When classified by the number of intersections, there are three kinds of intersections, four intersections, three intersections and two intersections. However, as described with reference to FIG. 3 above, in the detection range of the circular image sensor 3, the register mark 2 is misregistered within a range where one intersection does not occur.

There are the following three types depending on the coordinate position of the reference point of the register mark 2. The reference point of the register mark 2 exists in any one of the first quadrant, the second quadrant, the third quadrant, and the fourth quadrant of the circle having coordinates with the center of the circular image sensor 3 as the origin (pattern number [2] Through [5],
[10] to [21]), or what exists at the center of the circle of the circular image sensor 3 (pattern number [1]) and either X or Y of the bar 2-1 of the register mark 2 is a circular image. Those that match the coordinate axis of the circle of the sensor 3 (Pattern number [6] or

[9]).

In order to detect in which quadrant of the coordinate of the circular image sensor 3 the reference point of the register mark 2 exists from each of these patterns, the quadrant where the intersection of the register mark 2 and the circular image sensor 3 is the same. It is only necessary to detect what exists in two places.

As will be described in detail later, for example, in the pattern number [2], since the two intersection points P1 and P2 are in the first quadrant, the reference point of the register mark 2 is the first quadrant of the coordinates of the circular image sensor 3. Exists in. Therefore, the presence of the first quadrant of the reference point of the register mark 2 indicates that the register mark 2 is in a state of being displaced in the top direction and the right direction.

The pattern number [1] indicates that the reference point of the register mark 2 and the origin of the coordinates of the circular image sensor 3 are in a matched state. FIG. 12 is a partial view of an embodiment of the register error detection circuit of the multicolor printing press of the present invention. FIG. 13 is a partial view of the embodiment of the register error detection circuit of the multicolor printing press of the present invention. The left side is connected to the right side of FIG. 12, and FIG. 14 is a partial view of the configuration of one embodiment of the register error detecting circuit in the multi-color printing press of the present invention, the left side of which is connected to the right side of FIG. Shows. This will be described with reference to the tie chart of the main part of the present invention in FIG.

The adjustment of the register error between the left and right sides is performed after the adjustment of the register error of the twist, which will be described later. That is, as described with reference to FIG. 5, when the plate is not twisted, if the coordinate position of the reference point of the register mark 2 is obtained, the amount of misalignment of the register mark 2 between the top and bottom can be obtained.

12 to 14, a pulse EP of the encoder 11 generated in synchronization with the rotation of the plate cylinder, that is, a synchronizing pulse (FIG. 17 [2]) and a predetermined plate cylinder rotation position of the plate cylinder rotation. The pulse BP generated in synchronization with the synchronization pulse, that is, the reference pulse (FIG. 17 [3]) is
It is input to the scan start timing generation circuit 12. In the scan start timing generation circuit 12, the register mark 2 is aligned with the image sensor camera 13 including the circular image sensor 3 including 720 light receiving elements described above, that is, the image sensor camera 13
Is configured to generate a scan start pulse (FIG. 17 [4]) when the position reaches a position where the black register mark 2 (FIG. 17 [1]) can be captured. Each time each of the black, cyan, magenta, and yellow register mark 2 (FIG. 17 [1]) printed on the head portion reaches the alignment position of the image sensor camera 13, the scan start timing generation circuit 12 causes the scan start pulse to be generated. Is generated (FIG. 17 [4]).

The light source lamp 14 for irradiating the reading position of the image sensor camera 13 is, for example, a halogen lamp having high brightness. The black registration mark 2 printed at the leading edge reaches the reading position of the image sensor camera 13, and the scanning start timing generation circuit 12
Scan start pulse from image sensor camera 13
17 (4), the image sensor camera 13 scans to read the image of the register mark 2 and send out a video signal (FIG. 17 [5]). This video signal is discriminated by the threshold circuit 15 for light and dark of an image and a non-image, and the discriminated signal is input to the AND circuit 1 through an inverting circuit (inverter) 16.

On the other hand, the enable signal of the image sensor camera 13 is at the H level (hereinafter abbreviated as "H") while the video signal is being sent (FIG. 17).
[6]), and this H is input to the AND circuit 1.

The clock signal of the oscillator 24 (see FIG.
[7]) is input to the image sensor camera 13, and the image sensor camera 13 outputs the video signal and the enable signal in synchronization with the clock signal (FIGS. 17 [6] and [8]). .

The output signal of the AND circuit 1 is input to the two differentiating circuits 18 and 19, and in the differentiating circuit 18, the output signal of the AND circuit 1 is at L level (hereinafter abbreviated as "L"). ) To H, that is, when the video signal of the image sensor camera 13 changes from light to dark, a differential pulse is generated. Also differentiating circuit 1
Reference numeral 9 generates a differential pulse when the output signal of the AND circuit 1 changes from H to L, that is, when the video signal of the image sensor camera 13 changes from dark to bright.

The respective differential pulses of these two differentiating circuits 18 and 19 are inputted to the OR circuit 1, and the output signal thereof is inputted to the counter 22 via the frequency divider 21 having a frequency dividing ratio of 2, and the image sensor camera 13 outputs. While the enable signal is H, the differential pulse is counted by the counter 22 (FIG. 17).

[9]). That is, the counter 22 counts one set of the differential pulse from the light signal to the dark signal of the video signal output by the differentiating circuit 18 and the differential pulse from the dark signal to the light output by the differentiating circuit 19 as one pulse.

The count value of the counter 22 is decoded by the decoder 23, and its output 0 is the first intersection P1 between the circular image sensor 3 and the register mark 2 (see FIG. 10,
(See FIG. 11), the output 1 of which is the register N3, which is associated with the second intersection P2.
N4, its output 2 is the registers N5 and N6 associated with the third intersection P3, its output 3 is the registers N7 and N8 associated with the fourth intersection P4, and its output 4 is the intersection P14 (this P14 Each of the light-to-dark and dark-to-light pixels described in FIG. 9 above are detected from the beginning to the end of the video signal sent by the image sensor camera 13 by enabling a register N9 associated with A timing signal is generated to latch the number in each register (FIG. 17 [10]).

The clock signal of the oscillator 24 is the counter 2
5, the counter 25 counts 720 clock signals to 720 while receiving the enable signal of the image sensor camera 13, that is, while scanning from pixel numbers 1 to 720 (FIG. 17).

[9]).

The count value of the counter 25 is input to each of the registers N1 to N9, and the differential pulse of the differentiating circuit 18 for detecting light to dark is input to each of the registers N1, N3, N5, N7, N9. In addition, the differential pulse of the differentiating circuit 19 for detecting dark to bright is transmitted via the OR circuit 3 to the registers N2, N4 and N.
6 and N8, respectively.

Therefore, the pixel number n1 of the circular image sensor 3 which changes from bright to dark at the beginning of the first intersection P1 of the circular image sensor 3 and the register mark 2 is latched in the register N1 (see FIG. ]), The pixel number n2 of the last dark circular image sensor 3 that has changed from dark to bright at the intersection P1 is latched in the register N2 (FIG. 17 [12]).

Similarly, in the registers N3, N5, N7 and N9, the circular image sensor 3 which changes from light to dark at the beginning of each of the intersection points P2, P3, P4 and PX.
Pixel numbers n3, n5, n7, and n9 (n9 is not shown) are respectively latched (FIG. 17 [13],
[15], [17], [19]), registers N4, N
6 and N8, the last dark circular image sensor 3 that has changed from dark to bright at the intersection P2, the intersection P3, and the intersection P4.
Pixel numbers n4, n6 and n8 are latched (FIGS. 17 [14], [16] and [18]).

The enable signal of the image sensor camera 13 is also input to the timing generation circuit 41, and a certain period after the enable signal is input, that is, scanning of the array of 720 light receiving elements of the circular image sensor 3. After the end, the timing generation circuit 41 outputs pulses T1 to T6 (see [21] to [2 in FIG. 17].
6]).

With the pulse T1, the arithmetic circuits 31 to 34 and the arithmetic circuits 35 to 37 are caused to register N1 to N9.
The following calculation is performed based on the data latched in. The arithmetic circuit 31 calculates P1 = (n1 + n2-2) / 4 to obtain the angle .theta.1 of the first intersection point P1 between the bar 2-1 of the register mark 2 and the circular image sensor 3 (at this time, the register mark described in FIG. The average value of the bar 2-1 of the mark 2 is adopted. The same applies hereinafter), and in the arithmetic circuit 32, P2 = (n3 + n4-2) /
4 is calculated to obtain the angle θ2 of the second intersection P2 between the bar 2-1 of the register mark 2 and the circular image sensor 3,
The arithmetic circuit 33 calculates P3 = (n5 + n6-2) / 4 to obtain the angle θ3 of the third intersection point P3 between the bar 2-1 of the register mark 2 and the circular image sensor 3, and the arithmetic circuit 34 calculates P4 = ( n7 + n8-2) / 4 is calculated to obtain the angle θ4 of the fourth intersection P4 between the bar 2-1 of the register mark 2 and the circular image sensor 3.

In the arithmetic circuit 35, "720" latched in advance in the register 38 is used, and S1 = n2 + 72
0 is calculated, and in the calculation circuit 36, S2 = (S1 + n9-
2) / 4 is calculated and the arithmetic circuit 37 calculates the arithmetic circuit 36.
If S2 calculated in step S2 is S2 ≧ 360, the register 3
9 is pre-latched "360" and S3 = S
Calculate 2-360.

Next, the pulse T2 generated by the timing generation circuit 41 operates as follows. The value n1 latched by the register N1 and "1" are compared by the comparator 40,
In the case of n1> 1, the arithmetic circuit 31 is connected via the AND circuit 3.
The P1 obtained in step 1 is latched in the register P1. When n1 = 1, the operation circuit 37 is connected via the AND circuit 4.
S3 obtained in step S4 is latched in the register P14. When n1> 1, P1 latched in the register P1
Input to the operation determination circuit 42 via the OR circuit 2, and when n1 = 1, P14 latched in the register P14
(= S3) is input to the operation determination circuit 42 via the OR circuit 2.

Registers P2 to P4 provided corresponding to the other arithmetic circuits 32 to 34 respectively latch P2 to P4 obtained by the arithmetic circuits 32 to 34, and the latched values are arithmetic decision circuits. 42
Enter each in.

Value latched by the register N1 n1 = 1
In the case of, it means that the array of the first light receiving element of the circular image sensor 3 detects the image, and the image of the intersection P14 is in the first quadrant and the fourth quadrant of the coordinates of the circular image sensor 3. It indicates that they may exist continuously. The value n1 latched by the register N1 is n
In the case of 1> 1, since the first array of light receiving elements of the circular image sensor 3 detects light, the intersection P1
The image of No. 4 does not exist in the fourth quadrant, that is, the intersection P14 does not exist, and the bar 2-1 of the register mark 2 is present.
Indicates that it does not intersect the X axis of the circular image sensor 3.

The value n1 latched by the register N1 is n
The case of 1 = 1 will be described in more detail in relation to the intersection P14. The width of the bar 2-1 on one side of the register mark 2 is, for example, the bar 2 corresponding to the length of 10 or more pixels.
-1 is printed. Therefore, when the pixel number 1 is an image, that is, when the first array of light receiving elements of the circular image sensor 3 detects an image, it is initially dark,
There is a possibility that the array of the 719th light receiving element before that is detecting an image.

For example, if the content of the register N1 is 1, then n1 = 1 and the pixel number is 1. Therefore, the first video signal transmission is dark, the pixel number 8 is subsequently dark, and the ninth pixel is the darkest. In case of a clear change in, the content of the register N2 is 8 and n2 = 8. Bar 2 on one side of dragonfly mark 2
Since there may be 10 or more pixels in the width of -1, darkness may exist in the fourth quadrant. At this time, if the content of the register N9 is 715 and n9 = 715, for example, if the center position of the bar 2-1 with respect to the X coordinate of the coordinates of the circular image sensor 3 is represented by an angle, S2 = from the arithmetic circuits 35 and 36. (N2 + 720 + n9-2) / 4
Is calculated by. Substituting the above numbers, S2 = (720
+ 8 + 715-2) /4=360.25 degrees.

Since this angle is equal to 0.25 degrees, S2 ≧ 360 when compared by the comparator 40. Therefore, the angle S2 = θ1 = by performing the calculation of the calculation formula S3 = S2−360 of the calculation circuit 37. 0.25 degree is required. In the case of S2 <360 during the comparison by the comparator 40, the arithmetic circuit 36
The value of S2 calculated in step S1 is obtained as the angle θ1 by the calculation circuit 37 and is latched in the register P14 at the timing of the pulse T2.

That is, when the circular image sensor 3 is scanned and the first pixel number 1 is dark and is image data,
It is suggested that the pixel numbers before the pixel number 719 before that are also consecutively some dark image data, and the intersection of the bar 2-1 of the register mark 2 and the circular image sensor 3 at that time is called P14. . Then, the first dark pixel number at which the intersection P14 changes from light to dark is latched in the register N9.

In the case of n1> 1, as described above, n1 of the video signal is the pixel number when changing from bright to dark, and the angle θ1 of the intersection point P1 is calculated by the arithmetic circuit 31 as P1 = θ1.
= (N1 + n2-2) / 4.

In the latching process described above, when the value n8 latched in the register N8 is equal to 720, the value latched in the register N9, that is, the intersection point P14.
Does not occur, and the calculation is not performed in the calculation circuit 34, and the register N is stored in n9 in the calculation formula of the calculation circuit 36.
The value n7 latched at 7 is taken. Therefore, in this case, the value P4 = θ4 latched in the register P4 is not calculated by the calculation circuit 34.

The operation determining circuit 42 is activated by the next pulses T3 and T4 generated by the timing generating circuit 41, and the register adjusting device 43 is activated by the next pulses T5 and T6. The operations of both of them will be described in detail with reference to FIGS.

Although not shown, register N1
Through register N9, register P1 through register P4
The register P14 is reset by an appropriate timing after the register errors dx and dy described in FIGS. 15 and 16, for example, the pulse T6 shown in FIG.

FIG. 15 is a partial view of the configuration of an embodiment of the operation determination circuit used in FIG. 14, and FIG. 16 is shown in FIG.
15 is a partial view of the configuration of an embodiment of the operation determination circuit used in FIG. 1, the left side of which is connected to the right side of FIG.

The calculation determining circuit determines in which quadrant of the coordinates of the circular image sensor 3 the reference point of the register mark 2 exists, and the left and right of the reference point with respect to the origin.
This is a circuit that calculates each top-bottom registration error.

Register P1 or P14, P2, P3, P
The angle data of No. 4 is input to the comparators 53 to 63 and compared with preset values. That is, the comparators 53 to 56 compare the first intersection point P1 or P14 to determine in which quadrant of the coordinates of the circular image sensor 3 it exists, and the comparators 57 to 59 compare the second intersection point P2. With respect to the quadrant, and the comparators 60 to 62 compare and compare the third intersection P3 with the quadrant with respect to the third intersection P3. The device 63 compares the fourth intersection point P4 to determine whether it is in the fourth quadrant.

In the comparators 54, 57 and 60, the intersections P1 or P14, P2 and P3 are circular image sensors 3 respectively.
Are compared in order to determine whether they are present in the first quadrant of the coordinates, and the comparators 55, 58, 61 determine whether each intersection P1 or P14, P2, P3 is present in the second quadrant. Comparing to determine, comparators 56, 59, 6
2 is compared to determine if each intersection P1 or P14, P2, P3 is in its third quadrant. From the combination of these comparators 54 to 63, when the reference point of the register mark 2 is in the first quadrant of the coordinates of the circular image sensor 3 (not on the coordinate axis), the AND circuit 14 outputs a signal. The AND circuit 14
The signal is output from the case of [2] in FIG. 10 and [10], [11], and [18] in FIG. 11, and at this time, the signal is output to the multiplexer 64 via the OR circuits 1, 6, and 5. Then, the multiplexer 64 selects the angle θ2 of P2. The angle θ2 of P2 is input to the X register error circuit 66, and the register error dx = r · cos θ2 is calculated. r is the radius of the circle of the circular image sensor 3.

The signal of the AND circuit 14 is also sent to the multiplexer 65, and the multiplexer 65 outputs P
An angle θ1 of 1 is selected. The angle θ1 of P1 is input to the Y registration error circuit 67, and the registration error dy = r · sin θ
Calculation of 1 is performed.

These register errors dx and dy are transmitted to the register adjusting means 68. The register adjusting means 68 makes each adjustment based on the register errors dx and dy. When the reference point of the register mark 2 is in the second quadrant of the coordinates of the circular image sensor 3 (not including the coordinate axis), signals are output from the AND circuits 15 and 18. The signals output from the AND circuit 15 are [13] and [1] in FIG.
9], a signal is sent to the multiplexer 64 via the OR circuit 2 at this time, and the multiplexer 64 outputs P
An angle θ1 of 1 is selected. Further, a signal is also sent to the multiplexer 65 via the OR circuit 7, and the multiplexer 65 selects the angle θ2 of P2. Thereafter, the register errors dx and dy are respectively obtained in the same manner as described above, and the register adjusting means 68 makes the respective adjustments.

A signal is output from the AND circuit 18 in the cases of [3] of FIG. 10 and [12] of FIG.
At this time, a signal is sent to the multiplexer 64 via the OR circuits 3 and 5, and the multiplexer 64 concerned makes an angle θ2 of P2.
Is selected. Further, a signal is also sent to the multiplexer 65, and the multiplexer 65 selects the angle θ3 of P3. Thereafter, the register errors dx and dy are respectively obtained in the same manner as described above, and the register adjusting means 68 makes the respective adjustments.

When the reference point of the register mark 2 is in the third quadrant of the coordinates of the circular image sensor 3 (not including the coordinate axis), signals are output from the AND circuits 16 and 17. The signal output from the AND circuit 16 is shown in FIG.
In the case of 1 [15] and [20], at this time, a signal is sent to the multiplexer 64 via the OR circuits 1, 6 and 5, and the multiplexer 64 selects the angle θ2 of P2. Further, a signal is also sent to the multiplexer 65, and the multiplexer 65 selects the angle θ1 of P1. Thereafter, the register errors dx and dy are respectively obtained in the same manner as described above, and the register adjusting means 68 makes the respective adjustments.

A signal is output from the AND circuit 17 in the cases of [4] of FIG. 10 and [14] of FIG.
At this time, a signal is sent to the multiplexer 64 via the OR circuit 4, and the multiplexer 64 selects the angle θ3 of P3. Further, via the OR circuit 7, the multiplexer 6
The signal is also sent to 5, and the multiplexer 65 selects the angle θ2 of P2. Thereafter, the register errors dx and dy are respectively obtained in the same manner as described above, and the register adjusting means 68 makes the respective adjustments.

When the reference point of the register mark 2 is in the fourth quadrant of the coordinates of the circular image sensor 3 (not including the coordinate axis), signals are output from the AND circuits 7, 8, 9. The signal output from the AND circuit 7 is shown in FIG.
In the case of [21], the signal is sent to the multiplexer 64 through the OR circuit 2 at this time, and the multiplexer 6
At 4, the angle θ1 of P1 is selected. Further, a signal is also sent to the multiplexer 65 via the OR circuit 7, and the multiplexer 65 selects the angle θ2 of P2. The registration errors dx and dy are obtained in the same manner as described above,
Each adjustment is performed by the register adjusting means 68.

The signal is output from the AND circuit 8 in the cases of [16] and [17] in FIG. 11, at which time the signal is sent to the multiplexer 64 via the OR circuits 3 and 5, and the multiplexer 64 is connected. At 64, the angle θ2 of P2 is selected. Further, a signal is also sent to the multiplexer 65, and the multiplexer 65 selects the angle θ2 of P3.
Thereafter, the register errors dx and dy are respectively obtained in the same manner as described above, and the register adjusting means 68 makes the respective adjustments.

Further, the signal is output from the AND circuit 9 in the case of [5] in FIG. 10, and at this time, the signal is sent to the multiplexer 64 through the OR circuit 4, and the angle θ3 of P3 is transmitted by the multiplexer 64. To be selected. Further, a signal is also sent to the multiplexer 65, and the multiplexer 6 concerned
At 5, the angle θ4 of P4 is selected. Thereafter, the register errors dx and dy are respectively obtained in the same manner as described above, and the register adjusting means 68 respectively adjusts them.

On the other hand, when the reference point of the register mark 2 is on the X coordinate axis of the coordinates of the circular image sensor 3,
The comparator 53 outputs a signal indicating that the reference point is on the X coordinate axis. The comparator 53 outputs a signal as shown in FIG.
In the case of 0 [1], [6], and [7], the signal of the comparator 53 is input to the AND circuits 11 and 12 at this time.

In the case of [1] in FIG. 10, a signal indicating that the intersection P2 coincides with the Y axis of the coordinates of the circular image sensor 3 is further output from the comparator 57, and the signal is the AND circuits 12 and 13. And enter. As a result, an XY matching signal is output from the AND circuit 12, and XY matching is displayed on the display unit 69. That is, the register errors dx and dy are each 0, which means that no adjustment is required.

In the case of [6] and [7] in FIG. 10, a signal indicating that the intersection P3 coincides with the X axis of the coordinates of the circular image sensor 3 is further output from the comparator 61, and the signal is an AND circuit. Enter in 11. As a result, the AND circuit 11
A P1Y matching signal is output from the display unit 69, Y matching is displayed on the display unit 69, and a signal is also sent to the multiplexer 64 via the OR circuit 5, and the multiplexer 64 is connected.
The angle θ2 of P2 is selected with. Thereafter, the register error dx due to the angle θ2 of the P2 is obtained in the same manner as described above, and the register adjusting means 68 adjusts only the register error dx.
That is, since the Y axes are aligned, it is not necessary to adjust the register error dy.

When the reference point of the register mark 2 is on the Y coordinate axis of the coordinates of the circular image sensor 3, the comparators 54 and 57, for example, output a signal indicating that the reference point is on the Y coordinate axis. . The comparator 54 outputs a signal in FIG.

In the case of [9], the comparator 57
Outputs a signal in the case of [8] in FIG.
At this time, the signal of the comparator 54 is input to the AND circuit 10,
The signal from the comparator 57 is input to the AND circuit 13.

Then, in FIG.

In the case of [9], the comparator 62 further outputs a signal indicating that the intersection P3 coincides with the Y axis of the coordinates of the circular image sensor 3, and the signal is input to the AND circuit 10. As a result, the P1X matching signal is output from the AND circuit 10, the X matching is displayed on the display unit 69, and the signal is also sent to the multiplexer 65 via the OR circuit 7, and the multiplexer 65 causes the angle θ2 of P2. Is selected. After that, the register error dy due to the angle θ2 of the P2 is obtained in the same manner as described above, and the register adjusting means 68 adjusts only the register error dy. That is, since the X axis is aligned, it is not necessary to adjust the register error dx.

Further, in the case of [8] in FIG. 10 described above, a signal indicating that the intersection point P4 coincides with the Y axis of the coordinates of the circular image sensor 3 is further output from the comparator 63, and the signal is sent to the AND circuit 13. input. As a result, the AND circuit 13
The P2X matching signal is output from the display unit 69, the X matching is displayed on the display unit 69, and the signal is also sent to the multiplexer 65 via the OR circuit 6, and the multiplexer 65 is connected.
The angle θ1 of P1 is selected with. Thereafter, the register error dy due to the angle θ1 of the P1 is obtained in the same manner as described above, and the register adjustment means 68 adjusts the register error dy. At this time, a signal is also sent to the multiplexer 64 via the OR circuit 5, and the multiplexer 64 selects the angle θ2 of P2. However, the angle θ2 of P2 is θ2 = 90 °
Data is input to the X register error circuit 66, the register error dx = 0 is obtained, and the register error dx need not be adjusted. That is, the X-axis is aligned as displayed by the display means 69.

Although the black register mark 2 has been described above, similar registration error detection is performed for cyan, magenta and yellow (FIG. 17).
[1]). In this way, the registration error for each color is detected, the registration error is adjusted, and color matching is performed.

FIG. 18 shows the construction of an embodiment of the twist amount detecting circuit. In the figure, 68 corresponds to that of FIG. 16, 71 and 72 are reference point detection units, 73, 74 and 75 are registers, 76 and 77 are calculation units, and 78 is a comparator.

The reference point detecting section 71 detects the reference point in the X direction of the leading black register mark 2, for example,
Data of the coordinate position of the reference point is obtained using the circuit described above. The data Xf at the leading reference point is latched in the register 73. Similarly, the reference point detection unit 72 detects the reference point in the X direction of the rear black register mark 2, and this data Xr is latched in the register 74.

The register 75 has a paper width L described in FIG.
The length L1 of the black dragonfly mark 2 between 0 and the front and back
The ratio L0 / L1 of the above is latched as a fixed value in advance. The arithmetic unit 76 calculates d = Xf-Xr based on the data latched in the registers 73 and 74, and multiplies the ratio L0 / L1 latched in the register 75 by d obtained by the arithmetic unit 76. Is calculated by the calculation unit 77 to detect the twist amount D. The calculated twist amount D is transmitted to the register adjusting means 68 together with the correction direction instruction signal obtained by detecting in which direction the comparator 78 deviates. The register adjusting means 68 adjusts the twist amount D based on this data.

When one of the printed register marks of the desired coordinate position of the register mark 2 is used as the register mark detection calculation coordinates, an appropriate signal (not shown), for example, the first register mark from the operation panel is used. The detection calculation coordinate Xf of the register mark 2 to be the reference is latched in the register 73 by the instruction signal having the reference value of 2 and the rear register mark 2 latched in the register 74.
The registration error with the data Xr of is calculated. With respect to the register error between the colors to be overprinted, similarly, the register error of the other color can be obtained with reference to the register mark 2 of any color.

FIG. 19 shows a schematic construction of an embodiment of an automatic register adjustment automatic control device in a multi-color rotary press. In the figure, the running paper 1 printed with the register marks in the order of black, cyan, magenta, and yellow in the printing units of the first to fourth printing units 81-1 to 81-4 is the chill roller 82 and the roller 83. After being cut, etc., they are appropriately cut and stored in the folding portion 84. The image sensor cameras 13-1 and 13-2 for capturing the register marks 2 on the front side and the back side of the running paper 1 are installed on the way, and the circular images inside the image sensor cameras 13-1 and 13-2 are installed. The respective scan data obtained by the sensors 3-1 and 3-2 are respectively held in the video buffer 85-1 and the video buffer 85-2.

The respective scan data which are respectively latched in the video buffer 85-1 and the video buffer 85-2 are input to the processing means 86 which performs computer processing. The processing means 86 includes the register error detection circuit shown in FIGS. 12, 13 and 14 shown in FIG. 3, the operation determination circuit shown in FIGS. 15 and 16 shown in FIG. 2, and the twist amount detection circuit shown in FIG. It also has a calculation means 87 and an adjustment signal output means 88. Based on the signal of the register mark 2 input in the order of black, cyan, magenta, and yellow via the OR circuit 89, and based on the rotation pulse and one rotation pulse from the encoder 11 generated in synchronization with the rotation of the plate cylinder, Each timing pulse is generated by the scan start timing generator 12, and the processing means 86 is given proper timing.

As described above, the processing means 86 obtains the register error of the register mark 2 in the top-bottom direction and the left-right direction and the register error of the twist amount for each color, and the known register adjusting means 68 is used to eliminate the register error. Activate and register the print.

Referring to the inside of the register adjusting means 68, the plate cylinder fine movement motors 68-1 to 68-4 for the respective colors are shown.
Are shown for adjusting the horizontal direction, for adjusting the horizontal direction, and for adjusting the twist, but in a rotary press that prints multiple colors on both sides of the running paper 1, each of the above-mentioned plate cylinders for both colors has the above Three
It goes without saying that individual plate cylinder fine movement motors 68-1 to 68-4 are provided.

Although not shown in the figure, in the processing means 86, a proper comparator or the like determines whether or not the obtained registration error can be adjusted by the registration adjusting means 68. When the adjustable range of the means 68 is exceeded, the register adjusting means 68 is disabled and
X, Y registration error, XY alignment, X alignment,
In addition to the display of Y alignment, a display indicating that the register adjusting means 68 cannot be adjusted is displayed, and an alarm is issued at that time.

That is, when the number of detection points of the intersection with the registration mark 2 by the circular image sensor 3 is less than 2 due to an extreme misregistration or the like, the registration error cannot be calculated. This judgment is made by counting the signal from the decimal decoder 23 in FIG. 12 by a counter (not shown) and checking whether or not the counted number has reached a predetermined number. That is, when the value n1 latched in the register N1 is n1> 1 and the number of signals from the decimal decoder 23 is less than 2 (that is, the number of signals in FIG. 2 is at most signal 1), or n1 = 1 and the number of signals from the decimal decoder 23 is less than 3 (that is, at most signals 2 in FIG. 2 are signals 2), it is determined that the register error cannot be calculated. Then, the processing when the adjustment is impossible is performed as described above.

Although the register mark 2 having a tangible reference point has been described in the above description, the register mark has another shape, for example, a shape having a tangible reference point shown in FIG. Although the reference point is not specified, it may be a circle having a specific reference point and the reference point being detected, or a circle.

The reference point of the register mark having a shape having an intangible reference point where two lines or three lines of them can intersect in a predetermined relationship is also as described above.
Its position can be detected. When the register mark is a circle, it is as follows.

FIG. 21 shows a reference point detection explanatory diagram when the register mark is a circle. In the figure, 3 is a circular image sensor, 4 is a circle of a register mark,
The circle of the register mark 4 has the same diameter as the circle of the circular image sensor 3.

At the coordinates having the center of the circular image sensor 3 as the origin, when the intersections of the circular image sensor 3 and the register mark 4 are B and D, the reference point peculiar to the register mark 4, that is, the center point C is as follows. Is asked for.

The coordinates of the intersections B and D are (X1, Y1),
When (X2, Y2), ΔABE and ΔCDH are congruent, and ΔADF and ΔCBG are congruent. Therefore, X1 = Xa, X2 = Xb, Y1 = Ya, Y2 = Yb. The coordinates (X, Y) of the center point C of the register mark 4 are X = X1 + X2, Y = Y1 + Y2.

That is, the coordinate position of the center point C of the register mark 4 can be detected from the pixel number detected by the circular image sensor 3. Register mark 4
Even if the circle is filled, it is exactly the same as above.

[0102]

As described above, according to the present invention, it is not necessary to use a register mark having a special shape for register error detection. For example, a so-called register mark is used.
Using the register mark that has been used conventionally, the register mark is detected by one trigger scan for each register mark, the coordinate position of the reference point is obtained, and the deviation from the position where this point should be, That is, the register error can be easily obtained. Also, a relatively large variety of register marks can be used.

Further, in obtaining the coordinate position of the reference point, the center line position of the register mark is obtained and the calculation is performed based on this, so that the thick and thin lines of the printing line at the time of printing or printing the printing plate can be obtained. There is almost no effect of. Therefore, highly accurate register error detection and register adjustment control can be performed.

Since the display means displays X alignment, Y alignment, XY alignment, etc., it is possible to know where the adjustment is unnecessary, and when the register mark cannot be detected in a predetermined state and the detected register. When the error, that is, the deviation is too large and the automatic register adjustment control cannot be performed, an alarm is displayed together with the display, and it is possible to take immediate action.

Further, since the register mark can be easily read and the register error can be easily detected, an inexpensive register error detecting device and register adjusting control device can be realized.

[Brief description of drawings]

FIG. 1 is a layout view of an embodiment of a register mark according to the present invention.

FIG. 2 is an explanatory diagram of a relationship between a circular image sensor and a register mark.

FIG. 3 is a diagram for explaining a deviation between right and left of a register mark and a vertical direction.

FIG. 4 is an explanatory diagram of twisting.

FIG. 5 is an explanatory diagram for detecting the amount of vertical displacement.

FIG. 6 is an explanatory diagram for detecting a twist amount of a plate.

FIG. 7 is a diagram for explaining another detection of the twist amount of the plate.

FIG. 8 is an explanatory diagram of twist detection by calculation.

FIG. 9 is a diagram illustrating the detection of a register mark bar.

FIG. 10 is an explanatory diagram in which a range in which a circular image sensor captures an image of a register mark is patterned.

FIG. 11 is an explanatory diagram showing a pattern in which a circular image sensor captures an image of a register mark.

FIG. 12 is a partial view of the configuration of one embodiment of the register error detection circuit in the multi-color rotary press of the present invention.

FIG. 13 is a partial view of the configuration of one embodiment of the register error detection circuit in the multi-color rotary press of the present invention, the left side of which is shown in FIG.
It is connected to the right side of 2.

FIG. 14 is a partial view of the configuration of an embodiment of the register error detection circuit in the multi-color rotary press of the present invention, the left side of which is shown in FIG.
Is connected to the right side of.

15 is a partial view of the configuration of an embodiment of the operation determination circuit used in FIG.

16 is a partial view of the configuration of an embodiment of the operation determination circuit used in FIG. 14, the left side of which is connected to the right side of FIG.

FIG. 17 is a tie chart of the main part of the present invention.

FIG. 18 shows a configuration of an embodiment of a twist amount detecting circuit.

FIG. 19 is a schematic configuration of an embodiment of an automatic register adjustment automatic control device in a multi-color rotary press.

FIG. 20 is a view showing another embodiment of the register mark.

FIG. 21 is an explanatory diagram of reference point detection when a register mark is a circle.

[Explanation of symbols]

 1 Running Paper 2 Registration Mark 3 Circular Image Sensor 4 Register Mark 13 Image Sensor Camera 42 Calculation Judgment Circuit 68 Register Adjustment Means 69 Display Means

Claims (9)

[Claims] 1. At least one register mark having a specific reference point is printed on a running paper for each printing unit, and a circular image sensor of an image sensor camera in which a plurality of detection elements are arranged in a circle is scanned. The pixel data of each register mark is detected, the coordinate position of the reference point is calculated for each register mark from the detected pixel data at the coordinates with the center of the circular image sensor as the origin, and the reference point A register error detection method for a multicolor printing press, wherein a deviation from a desired coordinate position is obtained to detect a register error in the multicolor printing press. 2. The register according to claim 1, wherein the register mark having the unique reference point is a tangible reference point where at least two lines intersect in a predetermined relationship. Error detection method. 3. The register error detecting method in a multi-color printing press according to claim 1, wherein the register mark having the unique reference point is an intangible reference point determined by a predetermined relationship. 4. The register error detecting method in a multi-color printing press according to claim 1, wherein the coordinate position of the reference point of each register mark is predetermined for each register mark. 5. The register in a multi-color press as claimed in claim 1, wherein the coordinate position of the reference point of each register mark is determined with reference to the coordinate position of the reference point of a predetermined register mark. Error detection method. 6. In calculating the coordinate position of the reference point according to claim 1, a first pixel number of a line forming a register mark that changes from light to dark and a last pixel number that changes from dark to light. A method for detecting a registration error in a multi-color printing press, wherein an average value of the above is set as the center line position of the above line. 7. A register mark printed on a running paper by each printing unit and having a tangible or intangible unique reference point, and a plurality of detection elements arranged in a circle so that one register mark can be detected simultaneously. Equipped with an image sensor,
An image sensor camera provided so as to correspond to the printing position of the register mark, a scanning start signal generating means for outputting a scanning start signal of the circular image sensor at a timing associated with the rotation of the printing section, and a circular image by the scanning start. The multi-color printing is equipped with the pixel data detected by the sensor, the coordinate position of the center of the circular image sensor as the origin, and the calculating means for calculating the deviation of the coordinate position of the reference point of the register mark and the desired coordinate position A register error detection device for a multicolor printing press, which is adapted to detect a register error in the rotary press. 8. The register error in a multi-color rotary press according to claim 7, further comprising display means for displaying the deviation calculated by the calculation means and the deviation when the deviation exceeds a predetermined value and cannot be adjusted. Detection device. 9. A multi-color printing press having adjusting means for adjusting the phase of the plate cylinder of the printing section, wherein a register mark and a register mark, which are tangible or intangible and have unique reference points, are printed on the running paper by each printing section. An image sensor camera equipped with a circular image sensor in which a plurality of detection elements are arranged in a circle so that they can be detected all at once, and which is provided so as to correspond to the printing position of the register mark,
A scanning start signal generating means for outputting a scanning start signal of the circular image sensor at a timing associated with the rotation of the printing unit, and the pixel data detected by the circular image sensor by the scanning start are taken in, and the center of the circular image sensor is set as the origin. The register error detecting device having the coordinate position of the reference point of the register mark and the calculating means for calculating the deviation of the reference point from the desired coordinate position, and printing based on the deviation calculated by the calculating means. A register in a multicolor press, which is provided with an adjustment signal output unit for outputting an adjustment signal to the register adjusting unit to adjust the phase of the plate cylinder of the printing section, and automatically adjusts the register error in the multicolor press. Adjustment automatic control device.