JP2008055782A - Printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing machine, which can prevent mistaken recognition of mark including the seeing-through of a back pattern from developing. <P>SOLUTION: In the web cutting controlling device of the printing machine 1 equipped with a web sawing cylinder 33, a mark detector 23 and a compensator roller 17 for adjusting a web cutting position, a highly dense portion based on image data 63, the resolutions of which are converted to the resolution of the mark detector 23, is selected as a mark 2. In addition, the printing machine includes a relative positional relationship acquiring means 45 for calculating the relative positional relationship between the web running directional position of the selected mark 2 and the aimed cutting position D of the web, a detection timing controlling means 51 for controlling the detection timing of the mark 2 so as to execute the detection of the mark 2 with the mark detector 23 in a specified region based on the relative positional relation acquired with the relative positional relationship acquiring means 45 and a threshold setting means 47 for setting the threshold voltage S of a mark detection signal Ks by estimating the magnitude of the mark detection signal Ks of the selected mark 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a printing machine suitable for use in cutting a printed web at a predetermined position.

2. Description of the Related Art Conventionally, in a rotary printing machine or the like, for example, as shown in Patent Document 1, when a web is cut in the width direction after printing on the web, the cutting position is set so as not to cause a cutting shift in the web flow direction. A web cutting control device is provided for controlling the above.
In this method, the cutting position is controlled using a cut mark printed on the web (specifically, a cut register mark, hereinafter also simply referred to as a mark).
Based on the reference pulse from the encoder that rotates in synchronization with the folding machine saw cylinder, the timing at which the web is cut by the saw cylinder and the timing at which the mark is detected by the mark detector mounted at a fixed position The compensator roller is moved in the vertical direction so that they match or have a predetermined difference.
By moving the compensator up and down, it is possible to finely adjust the web path length and finely adjust the web phase with respect to the rotational phase of the saw cylinder, so that the cutting position of the printed matter can be held at a fixed position.

By the way, in Patent Document 1, since the mark is printed in the vicinity of the edge of the web on the outer side in the width direction of the pattern, the pattern is reduced accordingly.
In recent years, it has been required to print a large part of the pattern, and in order to cope with this, a mark is printed between the printed pattern and the extended range of the pattern. In order to reduce the number of patterns, an appropriate mark is set.
In this case, in particular, in the latter case, the mark position changes in the width direction of the web. Therefore, it is necessary to change the position of the mark detector in the width direction. The position of the mark detector must be detected by moving it in the width direction manually or by remote control operation, and this operation takes time. In addition, since the web continues to flow until the mark detector is placed at an appropriate position, the amount of waste paper increases as the above work takes longer.

Accordingly, the inventors of the present application have proposed a technique for controlling the position in the width direction of the mark detector before printing in accordance with the position in the width direction of the mark, as shown in Patent Document 2.
This technology converts the resolution of image data for plate making or image data obtained by processing the image data for plate making into the resolution of a mark detector, and based on the converted image data, the position where the mark exists on the web is converted. The mark detector is moved to the mark position in the width direction of the web based on the calculated mark position before printing is started, so that the mark on the web can be detected from the start of printing. Since the cutting position can be kept constant, the waste paper can be greatly reduced.

JP-A-8-174804 JP 2004-82279 A

  By the way, the mark detector detects a mark on the web by a change in the amount of light (luminance) reflected from the traveling web. In other words, the amount of reflected light from the web is strong on white paper, but the portion where there is much ink transfer such as solid printing (halftone dot area ratio 100%) such as a cut mark is significantly weakened. Therefore, the mark can be detected by a sudden change in the amount of reflected light (strong → weak or weak → strong).

However, since only the cut mark is not always printed on the surface (printing surface) of the web that passes through the detection area of the mark detector, there is a possibility that a portion that is not a mark is erroneously identified as a mark.
In other words, even when a mark is printed outside the image printing area on the web 1, the pattern portion also passes through the detection area of the mark detector, so the amount of reflected light suddenly increases in the pattern. If there is a part that changes, this may be mistaken as a mark. Also, when handling the edge part in the pattern as a mark-equivalent part, if there is a part where the reflected light amount changes abruptly in other parts of the pattern that pass through the detection area of the mark detector, There is a risk of false recognition.

In this way, if the cut mark (including the mark-corresponding part) is misidentified, the web will be cut at an inappropriate position, so adjustment by the operator is necessary, and any printed sheets cut during that time will be damaged. It becomes paper.
The edge of the pattern as a mark or mark-corresponding part is a specific part in the web traveling direction, but the mark detection is performed in the configuration in which the mark is detected over the entire web traveling direction. In addition to incurring this, the burden on the memory system and calculation system for determining the mark is incurred.

  In a rotary printing machine, printing is usually performed on both front and back sides. For example, when the web is thin, the pattern on the back side may be seen through (shown back) to the front side. This may be detected by the mark detector and misidentified as a mark.

  The present invention was devised in view of the above-described problems, and recognizes in advance the web running direction position of a mark with respect to a printed pattern (image), and the mark detection by the mark detector corresponds to the recognized mark position. It is an object of the present invention to provide a printing machine that can prevent the erroneous recognition of the mark and avoid the influence of the show-through.

In order to solve the above problems, the present invention employs the following means.
That is, a printing machine according to the present invention includes a cutting unit that cuts a web that is printed and running in a width direction, and a mark that is provided upstream of the cutting unit in the web running direction and detects a mark on the web. The web by the cutting means by changing a travel path length of the web based on a difference between a detector and a timing at which the web is cut by the cutting means and a timing at which the mark is detected by the mark detector. And a compensator roller that adjusts the cutting position of the image, wherein a portion having a high density is selected as the mark based on image data whose resolution is converted to the resolution of the mark detector. A relative positional relationship acquisition means for calculating a relative positional relationship between a web running direction position of the mark and a target cutting position of the web; Detection timing control means for controlling mark detection timing so as to detect the mark by the mark detector in a specific region based on the relative positional relationship acquired by the relationship acquisition means; and for the selected mark Threshold value setting means for setting the threshold value of the mark detection signal by estimating the magnitude of the mark detection signal.

According to the present invention, the compensator roller is controlled based on the difference between the timing at which the web is cut by the cutting means and the timing at which the mark is detected by the mark detector, and the travel path length of the web is changed by the compensator roller. Thus, the cutting position of the web by the cutting means is adjusted.
At this time, the relative positional relationship acquisition means selects a portion having a high density as a mark based on the image data whose resolution is converted to the resolution of the mark detector, and the web traveling direction position of the selected mark and the web The relative positional relationship with the target cutting position is calculated.
The detection timing control means performs control so that the mark detector detects the mark in the specific area based on the calculated relative positional relationship, so that the mark detection timing is specified in the specific area. It will be.
Therefore, since mark detection is performed only for a specific area on the web, the risk of erroneous mark recognition can be reduced, which contributes to reduction of waste paper.
Further, since the threshold value of the mark detector is set by estimating the mark detection signal of the selected high-density mark by the threshold setting means, even if there is an unexpected show-through, they are erroneously recognized as marks. The fear can be reduced, which can further contribute to the reduction of waste paper.
Further, it is possible to reduce the load on the memory system and the calculation system for the mark detection determination, and it is possible to configure the memory system and the calculation system at low cost.

In the above invention, it is preferable that the relative positional relationship acquiring unit selects a portion having the highest density in the specific region as the mark.
In this way, since the threshold value can be increased, the risk of erroneous recognition of an unexpected show-through as a mark can be further reduced.

  Further, in the printing press according to the present invention, a cutting unit that cuts a web that is printed and travels in the width direction, and a mark that is provided upstream of the cutting unit in the web traveling direction and detects a mark on the web The web by the cutting means by changing a travel path length of the web based on a difference between a detector and a timing at which the web is cut by the cutting means and a timing at which the mark is detected by the mark detector. And a compensator roller that adjusts the cutting position of the image sensor, the front surface image data and the back surface image data whose resolution is converted to the resolution of the mark detector is acquired and printed on the back surface image data A front / back composite image creating means for creating a front / back composite image data by multiplying the transparency of the web to be combined with the surface image data, and the front / back composite image The mark is selected based on the data, and the relative position relation acquisition means for calculating the relative position relation between the web running direction position of the selected mark and the target cutting position of the web is acquired by the relative position relation acquisition means. And a detection timing control means for controlling a mark detection timing so as to detect the mark by the mark detector within a specific period based on the relative positional relationship.

According to the present invention, the compensator roller is controlled based on the difference between the timing at which the web is cut by the cutting means and the timing at which the mark is detected by the mark detector, and the travel path length of the web is changed by the compensator roller. Thus, the cutting position of the web by the cutting means is adjusted.
At this time, the front and back composite image creating means obtains the front surface image data and the back surface image data whose resolution has been converted to the resolution of the mark detector, and multiplies the back surface image data by the transparency of the web to be printed. Since the front and back composite image data is created by combining, the front and back composite image data is image data that can estimate the show-through state.
Since the relative positional relationship acquisition means selects the mark using the front and back composite image data, it is possible to select the mark in a portion where there is no influence of show-through.
Since the detection timing control means controls the mark detector to detect the mark in the specific area based on the relative positional relationship calculated by the relative positional relation acquisition means, the mark detection timing is set to the specific area. Will be identified within.
Therefore, since the mark detection is performed only for a specific area on the web in a state where the influence of the show-through is eliminated, it is possible to reduce the possibility of erroneous recognition of the mark and contribute to the reduction of waste paper.

  In the printing machine according to the present invention, a mark position acquisition unit that acquires a web width direction position of the mark based on the image data, a drive unit that moves the mark detector in the web width direction, and a printing And detector position control means for controlling the driving means based on the web width direction position of the mark acquired by the mark position acquisition means before starting.

According to the present invention, the mark position acquisition unit acquires the web width direction position of the mark, and the detector position control unit moves the position of the mark detector in the web width direction to a position where the mark can be detected before printing starts based on the mark position acquisition unit. Therefore, it is possible to move the mark detector to the mark position before starting printing.
Thereby, the mark on the web can be detected from the start of printing, and the cutting position of the web can be kept constant, which can contribute to reduction of waste paper.

  Further, in the printing press according to the present invention, a cutting unit that cuts a web that is printed and travels in a width direction, and a cutting position of the web by the cutting unit is adjusted by changing a traveling path length of the web. A compensator roller and a mark detector provided on the upstream side in the web running direction of the cutting means are used to detect a pattern to be a cut mark printed on the surface of the web, and based on the detection result, the compensator roller A cutting control device having a cut-off controller that adjusts a position and changes a travel path length of the web, the cutting control device including an image printed on the front surface and a back surface of the web The pattern used as the cut mark is selected based on density information with a show-through image generated on the surface of the image.

According to the present invention, the cutting control device adjusts the position of the compensator roller by the cut-off controller based on the detection result of the pattern that becomes the cut mark detected by the mark detector, and changes the travel path length of the web. Adjust the cutting position of the web by the cutting means.
At this time, the pattern used as a cut mark is selected based on density information of an image printed on the front surface and a show-through image generated on the front surface by the image on the back side of the web. The pattern to be used can be selected.
Therefore, the possibility of being erroneously recognized as a cut mark can be reduced, and it is possible to contribute to reducing waste paper.

According to the present invention, the detection timing control means performs control so that the mark detector detects the mark in the specific area based on the calculated relative positional relationship. Can be reduced, and this can contribute to reducing waste paper.
Further, the relative positional relationship acquisition means selects a high density portion in the image data as a mark, and a threshold value of the mark detection signal is set based on the selected portion, or there is no influence of show-through using the front and back composite image data. Since the mark is selected for the portion, it is possible to eliminate the influence of show-through and further reduce the possibility of erroneous recognition of the mark, thereby further contributing to the reduction of waste paper.

Embodiments according to the present invention will be described below with reference to the drawings.
[First embodiment]
A printing machine 1 according to a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic configuration diagram schematically showing the printing press 1 according to the first embodiment of the present invention together with its cutting control device.
The printer 1 includes a paper feeding unit 3 that continuously feeds the web 15, an infeed unit 5 that continuously pulls out the web 15 from the paper feeding unit 3, adjusts it to a predetermined tension, and sends it to the downstream side; The number of printing units corresponding to the number of printing colors is arranged in parallel along the running direction 16 of the web 15, and the printing unit 7 that prints on both sides of the web 15 and the drying that heats the printed web 15 and dries the ink. Section 9, cooling section for cooling web 15 (not shown), web path section 11 for adjusting tension of web 15 and supplying it to folding machine 13, and cutting and folding web 15 at a predetermined position And a folding machine 13 which is formed into a fold and then carried out to the outside.

The web pass unit 11 includes a compensator roller 17 and a mark detection device 19.
The compensator roller 17 extends in a direction substantially perpendicular to the traveling direction of the web 15, and is moved toward and away from the travel path of the web 15 by driving the compensator roller moving motor 21 (in the case of FIG. 1, it moves up and down). It is comprised so that 15 driving | running | working path length may be changed.
In FIG. 1, the control direction of the compensator roller 17 is the vertical direction, but the direction may be different depending on the arrangement of the compensator roller 17, in other words, the traveling direction of the web 15 (for example, the left-right direction).
In short, it is only necessary that the travel path length of the web 15 can be finely adjusted by moving the compensator roller 17.

FIG. 2 is a plan view showing the mark detection device 19.
The mark detection device 19 includes a mark detector 23, a mark detector moving motor 21, a support frame 27, a support rail 29, and a drive screw shaft 31.
The mark detector 23 is composed of a photodiode or the like that detects light, emits light to the traveling web, converts the amount of light (luminous intensity) reflected from the web into a voltage, and outputs it as a detection signal (mark detection signal). Is.
Support frames 27 are provided on both sides of the web 15. The support rail 29 is a bar, extends so as to be substantially orthogonal to the traveling direction 16 of the web 15, and both ends thereof are fixedly attached to the support frames 27 and 27.

The drive screw shaft 31 is disposed substantially parallel to the support rail and is rotatably supported by one support frame 27.
The mark detector 23 is screwed to the drive screw shaft 31 and is slidably supported on the support rail 29.
The other end of the drive screw shaft 31 is configured to be rotationally driven by the mark detector moving motor 21, and the mark detector 23 screwed by the rotational drive is moved in the width direction (direction A). It is configured as follows.
The mark detector moving motor 21 and the drive screw shaft 31 constitute drive means 22 of the mark detector 23.

The folding machine 13 located downstream of the mark detector 23 in the web 15 traveling direction 16 is provided with a saw cylinder (cutting means) 33 that crosses the web 15. The saw cylinder 33 is configured to traverse the web 15 once per revolution.
An encoder 35 that outputs one reference pulse 37 for each rotation of the saw cylinder 33 is provided at the shaft portion of the saw cylinder 33.

  The cutting control device for a printing press according to this embodiment includes an image data storage unit 39, an image data conversion unit 41, a mark position acquisition unit 43, a relative positional relationship acquisition unit 45, a threshold setting unit 47, a detector position control unit 49, The detection timing control means 51, the mark detector moving motor 21 for changing the position of the mark detector 23 in the width direction, the display 53, the current position estimation means 55 for estimating the current position of the mark detector 23, and the position of the compensator roller 17 And a cut-off controller 57 for adjusting the cutting position deviation by adjustment.

The image data storage means 39 is image data that is the basis of a picture printed by the printing unit 7 [image data obtained by processing digital data for plate making used in the CTP system or image data that is the origin of a picture to be printed (for example, , CIP3 / 4-PPF standard digital data)] is acquired online from the plate making process and stored.
Here, image data stored in the RIP of the plate making system including DTP (Desk Top Publishing), RIP (Raster Image Processor), and CTP (Computer To Plate) is used.

That is, in the plate making system, DTP uses a computer to edit characters, line drawings, and photographs and collects the plate, and C, M, Y, and K image data for printing from the original data collected by DTP using RIP. And a printing plate is created directly from image data (digital data) created by RIP using CTP.
The image data relating to the cutting control device is image data created and stored by this RIP, and the data storage portion of the RIP corresponds to the image data storage means 39.
The image data is, for example, image data with a resolution of about 2400 dpi for image data that is the basis of a picture to be printed, and image data with a resolution of about 50 to 60 dpi for digital data of the CIP3 / 4-PPF standard. It is stored in the storage means 39.

The image data conversion means 41 converts the image data from the above 2400 dpi or 50-60 dpi to the resolution 50.8 dpi of the mark detector 23 in order to match the resolution of the image data to the resolution of the mark detector 23. Here, a conversion server that acquires image data from the RIP is applied.
The minimum mark unit that can be detected by the mark detector 23 used in the present embodiment is 10 mm in the web 15 width direction and 1 mm in the web 15 conveyance direction 16.
Further, in order to be detected as a mark by the mark detector 23, a blank space of 10 mm or more is required on the upstream side of the mark.

Here, in order to set the mark position indication accuracy to 0.5 mm, the image data conversion means 41 converts the image data to 50.8 dpi (in the case of 50.8 dpi image data, the equivalent width of 1 pixel is 0.5 mm). ).
The mark position indication accuracy depends on the field of view (detection area) of the mark detector 23. If the field of view of the mark detector 23 is wide, the mark position indication accuracy may be coarse.
That is, in the mark detector 23 according to the present embodiment, it is possible to find a mark with an accuracy of 0.5 mm (that is, the mark enters the visual field of the mark detector 23).

The mark position acquisition unit 43, the relative position acquisition unit 45, and the threshold setting unit 47 are provided as functional elements of the production management system 59.
The detector position control means 49 and the detection timing control means 51 are provided as functional elements of the control device 61.
The detection timing control means 51 may be provided as a functional element of the cut-off controller 57.

Among these, the mark position acquisition means 43 calculates (acquires) the mark position based on the image data whose resolution is converted by the image data conversion means 41 as shown in FIG.
Specifically, as shown in FIG. 3B, the image 63 whose resolution has been converted by the image data conversion means 41 is matched with the template 65 as shown in FIG. It comes to calculate. In this matching, a residual sequential test method as shown below is used.

  The template 65 includes a black portion 67 corresponding to a mark and a lattice portion 69 on the upstream side. Since the grid portion 69 corresponds to 0.5 mm at 10.8 pixels at 50.8 dpi, a 20 × 20 grid is formed by imitating a blank space of 10 mm or more necessary upstream of the mark over a length of 10 mm in the width direction. Is formed.

First, the template 65 is superimposed on the upper left of the converted image 63, and a difference between each pixel value of the template 65 and each pixel value at a position corresponding to the template 65 of the converted image 63 is obtained and accumulated.
If this cumulative value is equal to or smaller than a certain threshold value, this position (in this case, the position corresponding to the upper left of the converted image 63) is recorded as a position where there is an image close to the template 65 (that is, a mark is likely). To do. Next, the template 65 is shifted by one pixel and the same operation is performed, and the converted image 63 is sequentially scanned.

Since it is sufficient for the mark detector 23 to be able to detect a mark, processing is usually performed with a gray scale image (so-called black and white image). This gray scale image is created by superimposing cyan (C), magenta (M), yellow (Y), and black (K) images 63 with predetermined weights.
By such pattern matching, the mark position acquisition unit 43 calculates a plurality of mark candidate images (pictures) that can be used as the mark 2.

  The mark position acquisition unit 43 assumes a region (specific region) corresponding to the existence period of the gate signal Gs generated by the detection timing control unit 51 described later, and the mark (image) having the highest density in this region. Is calculated from the plurality of mark candidate images described above, and the mark is set as the optimum mark 2, that is, a mark-corresponding portion (a specific portion of a pattern regarded as a cut mark, hereinafter also simply referred to as a mark). It is like that.

As a result, the web 15 width direction position (position in the direction A in FIG. 2) and the web traveling direction position (web traveling direction position, position in the direction B in FIG. 2) of the mark 2 can be acquired.
Among these positions, as shown in FIG. 2, the left-right center CL of the normal print picture area 4 is equal to the left-right center (width-direction center) of the web 15, as shown in FIG. The position of the mark 2 based on can be used as the position of the mark 2 with respect to the web 15 as it is.

However, the position of the mark 2 in the direction B with respect to the web 15 is the margin distance (margin) m from the edge of the image area (picture area) 4 to the cutting position (target cutting position D), as shown in FIG. Therefore, it is not obtained only by the distance l from the end of the image area 4 to the mark 2 but is calculated as the sum of the distance l acquired by the mark position acquisition means 43 and the margin distance m on the web 15. There is a need to.
Therefore, the relative position acquisition unit 45 sets the position X in the direction B of the mark 2 relative to the web 15 (the distance from the cutting position to the mark 2) X as the distance l. It is calculated and acquired as the sum (X = 1 + m) with the margin distance m.

  Further, the cutting timing by the saw cylinder 33 can be grasped by the reference pulse signal 37 from the encoder 35 output in accordance with the cutting timing, but the reference pulse signal 37 is not necessarily synchronized with the cutting timing. Each printer has a unique phase difference (timing deviation). This phase difference d can be represented by d shown in FIG. 4 if it corresponds to the position of the web 15.

Therefore, in order to specify the position of the mark 2 with respect to the reference pulse signal 37, the positional deviation amount L between the reference pulse signal 37 and the mark 2 may be obtained. The positional deviation amount L can be obtained from the position X in the direction B of the mark 2 with respect to the web 15 (distance from the cutting position to the mark 2) X and the phase difference d, and the distance X is the distance l as described above. This is the sum of the margin distance m, the distance l can be obtained from the image data, and the margin distance m can be obtained from the B direction length and the cut-off length of the pattern area obtained from the image data. The distance X can be obtained.
The phase difference d can be acquired in advance as a value unique to the printing press. Therefore, the positional deviation amount L can also be obtained. Since the web 15 is traveling (usually traveling at a constant speed), the positional deviation amount L can be replaced with a temporal deviation as it is.

The threshold setting means 47 estimates the magnitude of the signal voltage when the mark detector 23 detects the selected mark 2. A threshold voltage (threshold) S is set by multiplying the estimated signal voltage by a threshold calculation coefficient.
Even in a pattern printed using the same image data, the printing state differs depending on the paper type used, and the light reflection state also differs. Therefore, the threshold value calculation coefficient is changed according to the paper type. . For high-quality paper, for example, 0.8 is used as the threshold value calculation coefficient.
Therefore, if the signal voltage estimated from the image data of the selected mark 2 is 3 V, for example, 2.4 V obtained by multiplying this by the high-quality paper threshold calculation coefficient 0.8 is set as the threshold voltage S. .

The detection timing control means 51 outputs the gate signal Gs only for a specific period including the mark 2 on the assumption that the mark 2 exists at the position shifted by the positional shift amount L from the reference pulse signal 37 as described above. The detection signal of the mark detector 23 is taken in via the cut-off controller 57 only during the period when the gate signal Gs is output.
The fetched mark detection signal is stored in a memory (not shown), but the output period of the gate signal Gs is set corresponding to the capacity of the memory.
That is, the output or input of the detection signal of the mark detector 23 is taken in a cycle shorter than the thickness of the mark 2 in the direction B in terms of the traveling direction (direction B) distance of the web 15 and stored in the memory. However, for example, if the capacity stored in the memory is 10 cycles (that is, 10), the gate signal Gs is also set to a period of 10 cycles.

As described above, if the detection period of the detection signal from the mark detector 23 is limited by the gate signal Gs, the mark 2 should pass through the visual field of the mark detector 23 during the acquisition period. Although the mark 2 can be detected without any problem, the mark 2 may be displaced due to expansion and contraction of the web 15 and the mark 2 may not be detected during the gate signal Gs period.
In this case, the timing of the gate signal is adjusted by an appropriate period (for example, 8 periods) within a range that does not completely deviate from the original gate signal Gs, that is, so as to partially overlap the original gate signal Gs. The mark 2 is detected by shifting back and forth.

  The current position estimating means 55 determines whether the mark detector 23 is a reference position (for example, from the rotational speed of the mark detector moving motor 21 detected by a potentiometer (not shown), the groove width of the screw groove of the drive screw shaft 31, etc.). The amount of movement from the position of the mark detector 23 shown in FIG. 2 is calculated, and the current position of the mark detector 23 in the width direction of the web 15 is estimated.

The detector position control means 49 drives the mark detector moving motor 21 to move the mark detector 23 in the web 15 width direction to a position where the mark 2 calculated by the mark position acquisition means 43 can be detected. It is supposed to be.
Then, when the current position estimating means 55 determines that the mark detector 23 has moved to a position where the mark 2 can be detected, the detector position control means 49 stops driving the mark detector moving motor 21, and the mark detector 23 23 is stopped at that position.

The detector position control means 49 displays the distance between the mark position and the current position of the mark detector 23 on the display 53.
For example, in FIG. 2, when the mark 2 passes through the position 30 cm above the mark detector 23 in FIG. 2, “+30 cm” or the like is displayed on the display 53. When the mark 2 passes through the position 5 cm below in FIG. 2, “−5 cm” or the like is displayed on the display 53.
Therefore, the operator can see the display 53 and confirm how much the mark detector 23 should be moved to which side.

The operation of the cutting control device for a printing press according to the present embodiment configured as described above will be described.
First, before starting printing, the image data conversion unit 41 sets the resolution of the image data for plate making stored in the image data storage unit 39 or the image data obtained by processing the image data for plate making up to the resolution of the mark detector 23. Convert.
Next, a plurality of mark 2 candidates that can be used as the mark 2 are calculated by pattern matching of the mark position acquisition unit 43.

The mark position acquisition unit 43 considers a specific region determined based on the existence period of the gate signal Gs set by the detection timing control unit 51, and has the highest density among the corresponding specific regions, that is, the mark A mark whose detection signal voltage by the detector 23 is estimated to be high is selected.
If there are a plurality of these, the mark with the highest density is selected.
When priority is given to shortening the movement time of the mark detector 23, the position of the mark 2 closest to the current position of the mark detector 23 estimated by the current position estimating means 55 is calculated, and the mark 2 May be selected.
The mark position acquisition unit 43 may select the mark with the highest density among the plurality of mark 2 candidates. In this way, the selected mark 2 automatically becomes the mark with the highest density in the specific area including this mark.

  Based on the web travel direction position of the mark 2 selected in this way, the relative position acquisition relation means 45 calculates a position X in the direction B of the mark 2 with respect to the web 15 (distance from the cutting position D to the mark 2) X. To do.

At this time, the detection timing control unit 51 detects the phase difference d between the position and cutting timing (cutting position D) of the mark 2 in the direction B with respect to the web 15 acquired by the relative positional relationship acquiring unit 45 and the reference pulse 37 of the encoder 35. From this, the positional deviation amount L between the reference pulse signal 37 and the mark detection signal Ks of the mark 2 is obtained (see FIG. 4), and the timing for generating the gate signal Gs is set based on the positional deviation amount L.
The gate signal Gs is generated so as to exist for a predetermined period before and after the expected rising edge of the mark detection signal Ks.
The detection timing control means 51 and the cut-off controller 57 are configured to capture the detection signal of the mark detector 23 only during the period during which the gate signal Gs is output.

Then, the detector position control means 49 drives the mark detector moving motor 21 based on the position information (direction A) of the mark 2 calculated by the mark position acquisition means 43, rotates the drive screw shaft 31, The mark detector 23 that is screwed to it is moved.
The detector position control unit 49 stops driving the mark detector moving motor 21 when the position of the mark detector 23 estimated by the current position estimating unit 55 reaches a position where the mark 2 can be detected.
At this time, the distance between the mark 2 position and the current position of the mark detector 23 is displayed on the display 53.

  As described above, in this cutting control device, the position in the width direction of the mark detector 23 is moved to a position where the mark 2 can be detected before printing is started. 2 can be detected. If the mark 2 can be detected, since the cutting position of the web 15 can be kept constant at the appropriate position from the start of printing, the amount of waste paper can be greatly reduced.

Then, after the movement of the mark detector 23 is completed, a normal printing operation is started.
The web 15 is pulled out from the paper feeding unit 3 by the infeed unit 5, adjusted in tension, and conveyed to the printing unit 7.
The pattern 4 is printed on both surfaces of the web 15 traveling by the printing unit 7. The printed web 15 is heated and dried by the dryer unit 9, cooled by the cooling unit, conveyed to the folding machine 13 through the web path unit 11, and cut by the saw cylinder 33 in the width direction of the web 15.

At this time, the cut-off controller 57 adjusts the cutting position of the web 15 by driving the compensator roller 59 and adjusting the position thereof to change the travel path length (travel path length) of the web 1. This adjustment work will be described.
The cutoff controller 57 is provided with a threshold set by the threshold setting means 47.
The cut-off controller 57 receives the detection signal from the mark detector 23, the reference pulse signal 37 from the encoder 35, and the gate signal Gs from the detection timing control means 51.

The cut-off controller 57 receives the detection signal of the mark detector 23 during the period when the gate signal Gs is being output, and when a voltage exceeding the threshold voltage S is detected, the cut-off controller 57 determines that this is the rise of the mark detection signal Ks. .
When the cut-off controller 57 detects the mark detection signal Ks, the cut-off controller 57 calculates a phase shift amount between the mark detection signal Ks and the immediately preceding reference pulse signal 37, and is there any deviation from the phase shift amount L calculated by the relative position acquisition unit 45? Determine.
If there is this deviation, the cut-off controller 57 operates the compensator roller moving motor 21 to drive the compensator roller 17 and changes the travel path length of the web 15 to eliminate the deviation. Thereby, the shift of the cutting position D is adjusted, and the web 15 can be cut at a predetermined position.

Here, the mark is selected by using the image data printed on one surface of the web (the web surface (front surface) on which the mark detector 23 is present) by the mark position acquisition means 43, so that it is printed on the surface. As long as the image to be viewed is viewed, there is no image that is erroneously recognized around the mark 2 on the surface. However, as shown in FIG. 5, there is a show-through image 6 in which an image printed on the opposite side (back side) is show-through and detected by the mark detector 23 in the vicinity of the mark 2. However, in the present embodiment, the threshold voltage S is selected on the assumption that the show-through image 6 is detected.
Specifically, in this case, when the gate signal Gs falls within the range, the mark detector 23 detects the show-through image 6 and generates a show-through detection signal 6s. If the magnitude does not exceed the threshold voltage S, the cutoff controller 57 does not recognize the mark detection signal Ks.
Therefore, as described above, since the mark 2 selected by the mark position acquisition unit 43 has the highest density among the candidate marks, the threshold voltage S set by the threshold setting unit 47 increases. For this reason, when the threshold voltage S increases, even if unexpected show-through images 6 exist in the vicinity of the mark 2, it is possible to reduce the possibility that they will be erroneously recognized as the mark 2. It can be prevented from becoming paper, and can contribute to reduction of waste paper.
As a modification, even if an image with the highest density on the surface is set as the mark 2, whether or not the value multiplied by the threshold value calculation coefficient approaches the show-through value of the show-through image 6 is determined as print image data or It may be estimated by comparing the highest density from logging data or the like, and if the detected value of the show-through image is likely to approach the threshold, the threshold calculation coefficient may be corrected and set higher.

Further, since the mark detector 23 detects only during the generation of the gate signal Gs, the portion of the image 4 detected during that time is limited to a specific portion (specific region) where the mark 2 is located. It will be. For this reason, since the ratio of the pattern that generates the detection signal exceeding the threshold voltage at this specific location is markedly reduced as compared with the case where the entire image 4 is targeted, the pattern similar to the mark 2 is designated as the mark 2. The risk of erroneous detection can be greatly reduced.
Further, it is possible to reduce the memory capacity required for mark detection and the burden on the arithmetic unit, which can contribute to cost reduction.

  However, it is conceivable that the mark 2 cannot be detected during such a gate signal Gs period. In this case, the timing of the gate signal is adjusted by an appropriate period (for example, 8 periods) within a range that does not completely deviate from the original gate signal Gs, that is, so as to partially overlap the original gate signal Gs. Since the mark 2 is detected by shifting back and forth, the mark 2 can be reliably detected.

  In the present embodiment, the threshold voltage S is set by detecting the selected mark 2 and estimating the magnitude of the mark detection signal Ks generated by the mark detector 23, but is appropriate for each paper type. A threshold voltage that is set may be provided in the cut-off controller 57 and selected according to the paper type.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
In this embodiment, the basic configuration is the same as that of the first embodiment, except that front and back composite image creation means is added. Therefore, in the present embodiment, this difference will be described, and redundant description of other parts will be omitted.
In addition, the same code | symbol is attached | subjected to the component same as 1st embodiment, and the detailed description is abbreviate | omitted.

The production management system 61 includes a front / back composite image creation means 71 as a functional element.
The front / back composite image creating unit 71 combines the front image data 73 printed on the front side and the back side image data 75 printed on the back side, which have been converted up to the resolution of the mark detector 23 by the image data conversion unit 41, to create a front / back composite image. Data 77 is created.

The front / back composite image creating means 71 is provided with a transparency setting unit 79. The transparency setting unit 79 has transparency corresponding to the paper type conditions (paper type, thickness, etc.) of the web 15 and sets the transparency according to the paper type of the web 15.
The transmissivity represents the degree to which the printed pattern can be seen through the back surface. For example, the transparency is 1.0 for a transparent resin and 0 for a considerably thick opaque paper. Values up to .0 are taken. For the web 15 for printing, for example, 0.6 for thin paper and 0.1 for thick paper.

When the front and back composite image creating means 71 combines the front surface image data 73 and the back surface image data 75, the front and back composite image data is multiplied by the transparency set by the transparency setting unit 79 to the back surface image data 75. 77 is created.
The mark position acquisition unit 43 is configured to select the mark 2 using the front / back composite image data 77 created by the front / back composite image creation unit 71. In this case, unlike the first embodiment, it is not necessary to select the mark candidate having the highest density as the mark 2. For example, the mark detector 23 having the least movement is set as the mark 2, and is ready for printing. The time may be shortened or another selection may be made.

The operation of the cutting control device for a printing press according to the present embodiment configured as described above will be described.
Except where the front / back composite image data 77 is generated by the front / back composite image generation means 71 and the mark 2 is selected using this data, it is the same as in the first embodiment described above. To do.

FIG. 7 is a schematic diagram showing a state in which the front and back composite image data 77 is created and a mark is selected.
The front / back composite image creation means 71 receives the surface image data 73 (see FIG. 7A) having the high-density pattern 81 from the image data conversion means 41.
Next, the front / back composite image creation means 71 receives back side image data 75 (see FIG. 7B) having a high-density pattern 83 from the image data conversion means 41.
Then, the transparency setting unit 79 sets the transparency corresponding to the paper type condition of the web 15 to be printed. For example, the transparency is 0.6 for thin paper.
Next, the rear surface image data 75 is given (multiplied) with a transparency of 0.6, and is half-rotated in the horizontal direction, and is combined with the front surface image data 73 (see FIG. 7C).

The mark position acquisition unit 43 selects a mark using the front and back composite image data 77.
As shown in FIG. 7C, when the pattern 83 on the back surface overlaps the pattern 81 on the front surface and the transparency is large and the pattern 83 is dark, a portion 85 where the pattern 83 does not exist is selected as a mark.

For example, when the web 15 is thick paper and the transparency is small, the front / back composite image data 77 is combined as shown in FIG.
In this case, since the pattern 83 on the back surface has a darkness that has almost no influence, the mark position acquisition unit 43 can select a mark regardless of the pattern 83.
For example, if the position where the pattern 83 exists is a position where it is not necessary to move the mark detection device 23 in the width direction, the portion 85 is selected as a mark, or the possibility of erroneous recognition is reduced as much as possible. In this case, a mark is selected for the portion 85 where the pattern 83 does not exist, as in FIG.

As described above, since the mark is selected using the front / back composite image data 77 that is image data that can be used to estimate the show-through state, the mark can be selected in a portion that is not affected by the show-through.
Since the mark selected in this way is detected by the mark detector 23, the possibility that the show-through image is erroneously identified as the mark 2 can be eliminated. As a result, it is possible to prevent the cutting position D from being displaced and lost, which can contribute to reducing lost paper.

The first embodiment and the second embodiment of the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications may be made without departing from the spirit of the present invention. Can do.
For example, in the above embodiment, a mark-corresponding portion, which is a specific portion of a design that is regarded as a cut mark, such as an edge portion of the design, is used as the mark 2, but a dedicated cut printed outside the margin that is not the design 4 portion. A register mark may be used as the mark 2.

Further, in each of the above embodiments, the detector position control means 49 controls the mark detector moving motor 21 of the driving means 22 based on the position of the mark 2 selected by the mark position acquisition means 43, and the mark detector 23. However, without providing such a system for automatically moving the mark detector 23, the current position of the mark detector 23 and the position of the mark 2 estimated by the current position estimating means 55 are simply provided. It is also possible to provide only a device (cutting auxiliary device) configured to display the distance between the two on the display 53.
Thus, the operator can be prompted to move the mark detector 23 and can be informed of how much the mark detector 23 should be moved. Accordingly, the operator can directly move the mark detector 23 before starting printing by viewing the display 53.

Further, without providing a system for automatically moving the mark detector 23 as described above, the display 53 shows the positional relationship between the current position of the mark detector 23 estimated by the current position estimating means 55 and the position of the mark 2. It is also possible to provide only a cutting assistance device configured to display an image schematically.
Even with this configuration, it is possible to prompt the operator to move the mark detector 23, and the operator can directly move the mark detector 23 before starting printing by looking at the display 53. .

Even when the cutting assisting device as described above is provided, the mark detector 23 can be moved in advance to an appropriate position before the start of printing, as in the case where the cutting control device of the present embodiment is provided.
That is, since the mark 2 on the web 1 can be detected from the start of printing and the cutting position of the web 15 can be kept constant without being affected by the show-through image, the amount of waste paper is greatly reduced. be able to.
In addition to the schematic image showing the positional relationship between the current position of the mark detector 23 and the position of the mark 2, the distance between the current position of the mark detector 23 and the position of the mark 2 is displayed on the display 53. It may be displayed.

  A known linear motion device may be used as means for moving the mark detector 23 in the web 15 width direction.

It is a schematic structure figure showing typically the printer concerning a first embodiment of the present invention. It is a top view explaining the drive means concerning 1st embodiment of this invention. It is a schematic diagram for demonstrating the mark position acquisition means concerning 1st embodiment of this invention, Comprising: (a) is a schematic diagram which shows the template, (b) is for demonstrating the pattern matching using the template. FIG. It is a schematic diagram explaining the signal state of the cut-off controller concerning 1st embodiment of this invention. It is a schematic diagram which shows the influence of a show-through picture. It is a schematic diagram which shows schematic structure of the production management system concerning 2nd embodiment of this invention. It is explanatory drawing which shows the synthetic | combination process in the front and back composite image preparation means concerning 2nd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printing machine 2 Mark 4 Picture 15 Web 17 Compensator roller 22 Drive means 23 Mark detector 33 Saw cylinder 35 Encoder 43 Mark position acquisition means 45 Relative positional relationship acquisition means 47 Threshold setting means 49 Detector position control means 51 Detection timing control means 63 Image data 73 Front image data 75 Back image data 77 Front and back composite image data

Claims (5)

A cutting means for cutting a web that is printed and running in the width direction;
A mark detector that is provided upstream of the cutting means in the web running direction and detects a mark on the web;
Based on the difference between the timing at which the web is cut by the cutting means and the timing at which the mark is detected by the mark detector, the running path length of the web is changed to change the cutting position of the web by the cutting means. A cutting control device for a printing press provided with a compensator roller to be adjusted,
A portion having a high density is selected as the mark based on the image data whose resolution is converted to the resolution of the mark detector, and the relative positional relationship between the web running direction position of the selected mark and the target cutting position of the web A relative positional relationship acquisition means for calculating
A detection timing control means for controlling a mark detection timing so as to detect the mark by the mark detector in a specific area based on the relative positional relation acquired by the relative positional relation acquisition means;
And a threshold value setting unit configured to estimate a mark detection signal size of the selected mark and set a threshold value of the mark detection signal.   The printing press according to claim 1, wherein the relative positional relationship acquisition unit selects a portion having the highest density in the specific area as the mark. A cutting means for cutting a web that is printed and running in the width direction;
A mark detector that is provided upstream of the cutting means in the web running direction and detects a mark on the web;
Based on the difference between the timing at which the web is cut by the cutting means and the timing at which the mark is detected by the mark detector, the running path length of the web is changed to change the cutting position of the web by the cutting means. A printing press equipped with a compensator roller to be adjusted,
The front image data and the back image data whose resolution is converted to the resolution of the mark detector are acquired, and the front and back composite image data is synthesized by combining with the front image data based on the transparency of the web printed on the back image data. Front and back composite image creation means to create,
Relative positional relationship acquisition means for selecting the mark based on the front and back composite image data and calculating a relative positional relationship between the web running direction position of the selected mark and the target cutting position of the web;
Detection timing control means for controlling mark detection timing so as to detect the mark by the mark detector in a specific area based on the relative positional relation acquired by the relative positional relation acquisition means. A printing machine characterized by Mark position acquisition means for acquiring a web width direction position of the mark based on the image data;
Driving means for moving the mark detector in the width direction of the web;
The detector position control means for controlling the drive means based on the web width direction position of the mark acquired by the mark position acquisition means before the start of printing is provided. A printing machine according to any one of claims 1 to 3. A cutting means for cutting a web that is printed and running in the width direction;
A compensator roller that adjusts the cutting position of the web by the cutting means by changing the traveling path length of the web;
A mark detector printed on the surface of the web is detected via a mark detector provided upstream of the cutting means in the web traveling direction, and the position of the compensator roller is adjusted based on the detection result. A cutting control device having a cut-off controller for changing a running path length of a web,
The cutting control device
A printing machine that selects a picture to be used as the cut mark based on density information between an image printed on the front surface and a show-through image generated on the front surface by an image on the back surface of the web.

Images