JP2008055783A - Printing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printing machine, in which stable web cutting controlling can be performed since the arrival of the starting speed of a web cutting controlling and consequently can reduce spoilage. <P>SOLUTION: In the printing machine 1 equipped with a sawing cylinder 33, a mark detector 23 for detecting a mark 2 in a web 15, a compensator roller 17 and a cutoff controller 59 for adjusting the cutting position D of the web 15 with the sawing cylinder 33 by changing the position of the compensator roller 17 based on the difference between the cutting timing of the web 15 with the sawing cylinder 33 and the detection timing of the mark 2 by the mark detector 23, this printing machine includes an initial position setting means 47 for setting the initial position of the compensator roll 17 at its controlling starting speed, at which the cutoff controller 59 starts its controlling action based on the mutual relations of the setting positions of the compensator roller 17 respectively corresponding to its production speed and to its adjusting speed lower than the production speed. <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 traveling 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 traveling path length and finely adjust the web phase relative 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.
In this case, the initial position of the compensator roller and the mark detection timing are set to values that are estimated to be optimal at the production speed so that the cutting control is started at the start of printing.

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

By the way, in the printing machine, before starting printing (operating at the production speed), the web is run at a low speed, and operations such as preliminary ink supply, color tone adjustment, and register adjustment are performed.
Since the tension of the web changes according to the traveling speed, and the elongation changes accordingly, the traveling path length changes in these work areas compared to the production speed.
For this reason, the compensator roller position that gives an accurate cutting position changes in accordance with the traveling speed of the web.
Therefore, when the control technique shown in Patent Document 2 is adopted, the waste paper is reduced as compared with the conventional technique, but at a speed lower than the production speed, the speed is lower than the production speed due to the cutting deviation due to the change in the compensator position. It took time to adjust the cutting position, and it took time until stable cutting control was performed.
Therefore, in order to further increase productivity, it has been a problem to reduce the waste paper generated until the cutting control is stabilized.

  In view of the above-described problems, an object of the present invention is to provide a printing machine capable of performing stable cutting control from the cutting control start speed and reducing waste paper.

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. Based on a difference between a detector, a compensator roller that changes the travel path length of the web by moving the position, 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 cutting control means for adjusting the cutting position of the web by the cutting means by changing the position of the compensator roller, when the cutting control means starts a cutting control operation. The initial position of the compensator roller is set to the competition speed corresponding to each of the production speed and a predetermined speed lower than the production speed. Wherein the initial position setting means for setting, based on the correlation between the set position of Setarora is provided.

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 compensator roller when the initial position setting means starts the cutting control operation based on the correlation between the production speed and the setting position of the compensator roller corresponding to each of the predetermined speeds lower than the production speed. Since the initial position is set, the cutting deviation at the cutting control start speed lower than the production speed can be suppressed, the mark on the web and the mark detection timing can be matched, and the cutting control operation of the cutting control means can be started. it can.
Thus, since the position of the compensator roller can be set to a predetermined value from the cutting control start speed that is lower than the production speed, the cutting control can be started, so that the shift to the production speed is performed while controlling the position of the compensator roller. .
Therefore, since stable cutting control can be performed at an early stage from the cutting control start speed, it is possible to reduce the amount of waste paper generated during that time.

  In the printing machine according to the present invention, the mark is selected based on the image data, and the relative positional relationship is obtained for calculating the 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 region based on the relative positional relationship acquired by the relative positional relationship acquiring means. It is provided.

According to the present invention, the relative positional relationship acquisition means selects 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 target cutting position of the web The relative positional relationship 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, in the printing press according to the present invention, the initial position setting means is configured so that when the speed at the start of the cutting control is substantially equal to the predetermined speed, the production speed and the predetermined speed at the previous operation are the same. A setting position of the compensator roller is acquired from logging data, mutual correlation data is created, and an initial position of the compensator roller at the start of the control is set based on the correlation data.

According to the present invention, if the speed at the start of the cutting control is substantially equal to the predetermined speed, the initial position setting means acquires the setting position of the compensator roller at the production speed and the predetermined speed in the previous operation from the logging data. Since the mutual correlation data is created and the initial position of the compensator roller at the cutting control start speed is set based on the correlation data, the compensator position and the mark detection timing can be matched from the start of the cutting control. The control operation of the cutting control means can be started.
Thus, the cutting control can be started from the speed at the start of the cutting control lower than the production speed, so that the shift to the production speed is performed while controlling the position of the compensator roller.
Therefore, since stable cutting control can be performed at an early stage from the speed at the start of cutting control, the amount of lost paper generated during that time can be reduced.

  Further, in the printing press according to the present invention, the initial position setting means is configured so that when the speed at the start of the cutting control is a speed lower than the predetermined speed, the initial position setting means The setting position of the compensator roller is acquired from logging data, mutual correlation data is created, and the initial position of the compensator roller at the start of the control is estimated and set based on the correlation data.

According to the present invention, the optimum position of the compensator roller at the start of control is set to be the same as that at the predetermined speed.
Since the speed difference between the predetermined speed and the cutting control start speed is considerably smaller than the speed difference between the predetermined speed and the production speed, the mark on the web and the mark detection timing at the cutting control start speed are There is almost no deviation. For this reason, since the cutting control can be started from the control start speed lower than the predetermined speed, the process shifts to the production speed while controlling the position of the compensator roller.
Therefore, since stable cutting control can be performed at an early stage from the cutting control start speed, it is possible to reduce the amount of waste paper generated during that time.

  Further, in the printing press according to the present invention, the initial position setting means is configured so that when the speed at the start of the cutting control is a speed lower than the predetermined speed, the initial position setting means The setting position of the compensator roller is acquired from logging data, mutual correlation data is created, and the initial position of the compensator roller at the start of the control is set using an interpolation method based on the correlation data. To do.

According to the present invention, the initial position of the compensator roller at the start of the cutting control is estimated and set using the interpolation method based on the setting position of the compensator roller at the production speed and the predetermined speed in the previous operation. Thus, the cutting deviation at the cutting control start speed can be suppressed rather than using the setting position of the compensator roller at the predetermined speed.
For this reason, the deviation between the mark on the web and the mark detection timing at the cutting control start speed can be reduced, and the cutting control can be started from the cutting control start speed lower than the predetermined speed, so that the production can be performed while controlling the position of the compensator roller. It will move to speed.
Therefore, since stable cutting control can be performed at an early stage from the cutting control start speed, it is possible to reduce the amount of waste paper generated during that time.

  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.

According to the present invention, when the initial position setting means starts the control operation based on the correlation between the production speed and the setting position of the compensator roller corresponding to each of the predetermined speeds lower than the production speed. Since the initial position of the compensator roller is set, stable cutting control can be performed at an early stage from a speed lower than the production speed.
As a result, the amount of waste paper generated can be reduced.

A printing machine 1 according to an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic configuration diagram schematically showing a printing press 1 according to an 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.
FIG. 3 is a block diagram showing the cutting control mechanism.
The compensator roller 17 extends in a direction substantially orthogonal 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 (up and down movement in the case of FIGS. 1 and 3). The travel path length of the web 15 is changed.
The cut-off controller 59 is configured to determine the timing of the detection signal of the mark detector 23 and the timing of the reference pulse of the encoder 35 to operate the compensator roller moving motor 21 and move the compensator roller 17 as will be described later. Yes.

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 25, 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 a mark detector moving motor 25, 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 25 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 the present 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 compensator roller position setting unit (hereinafter referred to as a compensator position setting unit). 47, a detector position control means 49, a detection timing control means 51, a logging data storage means 53, and a mark detector that changes the width direction position of the mark detector 23. A moving motor 25, a display 55, a current position estimating means 57 for estimating the current position of the mark detector 23, and a cut-off controller 59 for adjusting the position of the compensator roller 17 to adjust the deviation of the cutting position. Yes.

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, DTP (Desk Top
Publishing), RIP (Raster Image
Image data stored in a RIP of a plate making system comprising a processor and a 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 if the image data is the basis of a picture to be printed, and image data with a resolution of about 50 to 60 dpi if the digital data is 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 compensation position setting unit 47 are provided as functional elements of the production management system 61.
The detector position control means 49, the detection timing control means 51, and the logging data storage means 53 are provided as functional elements of the control device 62.
The detection timing control means 51 may be provided as a functional element of the cut-off controller 59.

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. 4B, the image 63 whose resolution has been converted by the image data conversion means 41 is matched with a 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 lattice-shaped portion 69 corresponds to 0.5 mm at 10.8 pixels at 50.8 dpi, a 20 × 20 lattice is formed by imitating a blank of 10 mm or more necessary on the upstream side 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 candidates that can be used as marks.

Then, the mark position acquisition means 43 calculates the mark closest to the current position in the web 15 width direction of the mark detector 23 estimated by the current position estimation means 57 to be described later from the plurality of mark candidates, and the mark Is set as an optimum mark, 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) 2.

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 with respect to the web 15 in the direction B is, as shown in FIG. 2, the margin distance (margin) m from the edge of the image area (picture area) 4 to the cutting position (target cutting position D). Therefore, it is necessary to calculate the sum of the distance l and the margin distance m, not the distance l from the end of the image area 4 to the mark 2 alone.
The relative position acquisition unit 45 determines the position X in the direction B of the mark 2 with respect to the web 15 (the distance from the cutting position to the mark 2) X with respect to the position in the direction B of the mark 2 with respect to the web 15. 43 is calculated and acquired as the sum of the distance 1 acquired by 43 and the margin distance m on the web 15 (T = 1 + 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. 5 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 misregistration amount L can be obtained from the position B in the direction B of the mark 2 with respect to the web 15 (distance from the cutting position to the mark 2) T and the phase difference d, and the distance T 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 T 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 production management system 61 estimates the magnitude of the signal voltage when the mark detector 23 detects the selected mark 2. The production management system 61 has a function of setting a threshold voltage (threshold) S by multiplying the estimated signal voltage by a threshold calculation coefficient.
Here, 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. Do. 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 59 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 57 determines whether the mark detector 23 is at the reference position (for example, from the rotational speed of the mark detector moving motor 25 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 25 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 57 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 25, and the mark detector 23 23 is stopped at that position.

Further, 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 55.
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 55. When the mark 2 passes through the position 5 cm below in FIG. 2, “−5 cm” or the like is displayed on the display 55.
Therefore, the operator can see the display 55 and confirm how much the mark detector 23 should be moved to which side.

The logging data storage means 53 includes paper type data such as paper width, paper quality, and paper thickness, a corresponding adjustment speed (predetermined speed), a tension pattern corresponding to the production speed, the compensator roller 17 adjustment position (optimum position), a triangular plate Control data such as the paper width interlocking position and turn bar position are stored as logging data.
When there are a plurality of folding machines 13, the logging data is managed for each folding machine.
The logging data storage means 53 stores adjustment values before factory shipment of the printing press 1, control data obtained by previous printing, and the like.
The logging data storage unit 53 may be provided as a function of the production management system 61.

The compensation position setting unit 47 sets an initial position of the compensator roller 17 (hereinafter also referred to as an optimal initial compensation position) when the cut-off controller 59 starts cutting control.
The compensation position setting means 47 transmits the set initial position of the compensator roller 17 to the control device 62 and the cut-off controller 59.
The timing for starting the cutting control (the speed at the start of the cutting control becomes the cutting control starting speed) is, for example, the time between cylinder insertion (cylinder insertion speed), adjustment (adjustment speed), and between the cylinder insertion and adjustment. Conceivable. Here, the adjustment speed is set for each print job at a speed reduced by a predetermined rate with respect to the production speed. By providing such a speed, the print adjustment can be performed at a speed lower than the production speed, so that it is possible to suppress the amount of lost paper generated during the print adjustment.

Compensation position setting means 47 takes in the data corresponding to the paper type to be printed from the logging data of the adjustment position of compensator roller 17 corresponding to the adjustment speed and production speed stored in logging data storage means 53, As shown in FIG. 8, a conversion function between the compensator roller 17 adjustment position at the production speed and the compensator roller 17 adjustment position at the adjustment speed is created.
In consideration of practicality, the paper type is defined by an infeed tension proportional to the paper basis weight, and the adjustment position of the compensator roller 17 is taken in even though the infeed tension is close.

The compensator position setting means 47 is a production speed corresponding adjustment position of the compensator roller 17 set in accordance with the production speed based on the conversion function shown in FIG. 8 (hereinafter, sometimes referred to as an optimum compensation position during production). The adjustment position corresponding to the adjustment speed of the compensator roller 17 corresponding to the adjustment speed corresponding to (hereinafter also referred to as the optimum compensation position during adjustment) is calculated. Specifically, when the trimming control is started at the time of adjustment, the compensation position setting unit 47 acquires the optimum compensation position information at the time of production according to the production speed defined as the condition of the print job to be executed. Then, the optimum compensation position at the time of adjustment corresponding to the obtained compensation position information at the time of production is calculated as the optimum compensation initial position at the cutting control start speed.
However, when starting trimming control other than at the time of adjustment, as will be described in detail later, the compensation position setting means 47 determines the speed from the optimum compensation position during production and the optimum compensation position during adjustment as shown in FIG. It has a function to estimate the position corresponding to.

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. From the plurality of mark 2 candidates, the position of the mark 2 closest to the current position of the mark detector 23 estimated by the current position estimating means 57 is calculated, and the mark 2 is set.

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.
In this way, it is possible to prevent the pattern on the back surface from being seen through and leading to erroneous recognition of the mark 2.
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 (distance from the cutting position D to the mark 2) T in the direction B of the mark 2 with respect to the web 15. To do.

On the other hand, the detection timing control unit 51 determines the position of the mark 2 in the direction B relative to the web 15 acquired by the relative positional relationship acquisition unit 45 and the cutting timing (cutting position D) from the phase difference d between the reference pulse 37 of the encoder 35. 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. 5), 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 59 capture the detection signal of the mark detector 23 only during the period during which the gate signal Gs is output.

At this time, if the compensator roller 17 is displaced from the optimum position by, for example, the distance Lz when the cutting control is started, the mark detection signal Ks may be out of the range of the gate signal Gs as shown in FIG. is there.
In such a state, the cut-off controller 59 cannot detect the mark 2 and cannot perform cutting control.
Therefore, in the present embodiment, a setting operation by the below-described compensation position setting unit 47 suppresses the deviation of the compensator roller 17 from the optimum position at the cutting control start speed. That is, the control for reducing the cutting deviation at the start of the cutting control is realized.
If the mark detection signal Ks is out of the range of the gate signal Gs as shown in FIG. 6 even if the setting operation by the compensation position setting means 47 is performed, the mark detection signal Ks is detected by shifting the generation timing of the gate signal Gs. To do.

At the same time, the setting operation of the compensation position setting means 47 will be described with reference to FIGS.
The compensation position setting means 47 creates a conversion function between the optimum compensation position during production and the optimum compensation position during adjustment in the flow shown in FIG.
First, the compensation position setting means 47 is the optimum compensation position at production and the optimum compensation position at adjustment recorded when a web having an infeed tension close to the infeed tension of the web 15 to be printed from the logging data storage means 53 is used. Is taken in (step S1).

The acquired logging data is narrowed down according to the following procedure (step S2).
First, the amount of movement of the compensator roller from the time of adjustment to the time of production in each printing operation, that is, the optimum compensator position during production-the optimum compensator position during adjustment is calculated.
Next, an average value of the movement amounts is obtained. When the amount of movement of each printing operation is far from this average value (for example, other than the 2σ section), the logging data is excluded from the target. That is, the data as indicated by region E in FIG. 8 is excluded from the target.

Next, data having the same paper width and close infeed tension (for example, reference value ± 5 daN) is extracted (step S3).
Then, the extracted optimum compensation position data during production and optimum compensation position during adjustment are plotted as shown in FIG. 8, and a least square method is applied to the data to create a position conversion function F of the compensator roller.

As shown in FIG. 7, when the cutting control is started from the point where the adjustment speed is reached (when the adjustment speed becomes the cutting control start speed), the position conversion function F corresponds to the printing production speed. The optimum compensation position at the time of adjustment corresponding to the optimum compensation position at the time of production is calculated and transmitted to the cutoff controller 59 for setting.
For example, when cutting control is started at the time of cylinder insertion J, which is in a speed range slightly slower than the adjustment speed, the setting position Y is the production speed X1, the optimum compensation position Y1 during production, the adjustment speed X2, and the adjustment. Using the hourly optimal compensation position Y2 and the barrel insertion speed X, the following formula is used.
(Equation 1)
Y = (Y1-Y2) / (X1-X2) * (X-X1) + Y1

It should be noted that the adjustment speed X2 and the cylinder insertion speed X are not greatly different from each other, and therefore the optimum compensator position at the time of adjustment calculated in FIG. 8 may be set as the compensator roller setting position Y at the time of cylinder insertion.
In addition, when the cutting control is started at a speed equal to or lower than the adjustment speed, the interpolation method performed for estimating the cutting control start speed and the optimum initial position of the optimum compensation is not limited to the above-described interpolation method. An interpolation method such as an interpolation formula or spline interpolation may be used.

As described above, in this embodiment, since the optimum position of the compensator roller corresponding to the speed at the adjustment speed at which cutting control is started or at the cylinder feeding speed is set, the cutting deviation at these speeds is suppressed and the mark on the web is set. The mark detection timing can be matched, that is, the mark detection signal Ks can be kept within the range of the gate signal Gs, and the cutting control operation by the cut-off controller 59 can be started.
As described above, since the trimming control can be started from the adjustment speed or from the case of inserting the cylinder, the position is shifted to the production speed while controlling the position of the compensator roller 17.
Therefore, since stable cutting control can be performed at an early stage from the cutting control start speed, it is possible to reduce the amount of waste paper generated during that time.

The detector position control means 49 drives the mark detector moving motor 25 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 means 49 stops driving the mark detector moving motor 25 when the position of the mark detector 23 estimated by the current position estimation means 57 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 55.

  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 and the setting of the cutoff controller 59 is completed, a normal printing operation is started.
When the printing press is driven, 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. Initially, the web 15 is conveyed at a substantially constant low speed, and the drying unit 9 is reheated. Also, preliminary ink supply is performed.
Thereafter, the web 15 is accelerated. While the speed is increased, the cylinders J are performed in each printing unit 7, and the pattern 4 is printed on both surfaces of the web 15 running in 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.

After the cylinder J, the web 15 is conveyed at a substantially constant adjustment speed, and an adjustment process for adjusting the color tone and the registration of the web 15 is performed.
At the start of this adjustment process, the cut-off controller 59 starts cutting control. At this time, since the position of the compensator roller 17 is the optimum compensation position at the time of adjustment, the mark detection signal Ms surely enters the range of the gate signal Gs. Thereby, cutting control is performed reliably.

At this time, the cut-off controller 59 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 59 is provided with a threshold set by the threshold setting means 47.
The cutoff controller 59 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 59 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 59 determines that this is the rise of the mark detection signal Ks. .
When the cut-off controller 59 detects the mark detection signal Ks, it calculates a phase shift amount between the mark detection signal Ks and the reference pulse signal 37, and determines whether or not there is a deviation from the phase shift amount L calculated by the relative position acquisition means 45. To do.
If there is this deviation, the cut-off controller 59 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.

At the time point G2 immediately before the end of the adjustment process, the position of the compensator roller that has changed or has not changed during the cutting control is taken into the logging data storage means 53.
Thereafter, the printing press 1 is accelerated to a substantially constant production speed, and a printing operation is performed.
At this time, since the production speed is reached with the cutting position controlled, the cutting control at the production speed can be stabilized at an early stage.
At the time point G1 when the cutting control at the production speed is stabilized, the position of the compensator roller that has changed or not changed during the cutting control is taken into the logging data storage unit 53.

In this embodiment, since the production management system 61 sets a threshold value for the mark detection signal Ms, the cut-off controller 59 does not recognize a detection signal below this threshold value as a mark detection signal.
For this reason, even if there is a show-through image 6 that is detected by the mark detector 23 in the vicinity of the mark 2 when the image printed on the opposite surface (back side) is show-through, they are marked 2. Therefore, it is possible to prevent the cutting position D from being misaligned and contribute to reducing the loss of paper.

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.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to these Embodiment, It can implement in various deformation | transformation in the range which does not deviate from the meaning of this invention.
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 a design, is used as the mark 2, but a dedicated cut printed outside the margin that is not a design of 4 copies. A register mark may be used as the mark 2.

In each of the above embodiments, the detector position control means 49 controls the mark detector moving motor 25 of the drive means 22 based on the position of the mark 2 selected by the mark position acquisition means 43, thereby 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 57 are simply provided. It is also possible to provide only a device (cutting assisting device) configured to display the distance between and the display 55 on the display 55.
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 55.

Further, without providing a system for automatically moving the mark detector 23 in the same manner as described above, the positional relationship between the current position of the mark detector 23 estimated by the current position estimating means 57 and the position of the mark 2 is simply displayed on the display 55. 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 55. .

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 55. 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 cutting control device concerning one embodiment of the present invention. It is a top view explaining the drive means concerning one Embodiment of this invention. It is a schematic block diagram which shows typically the cutting control means concerning one Embodiment of this invention. It is a schematic diagram for demonstrating the mark position acquisition means concerning one Embodiment of this invention, Comprising: (a) is a schematic diagram which shows the template, (b) is for explaining the pattern matching using the template It is a schematic diagram. It is a schematic diagram explaining the signal state of the cutoff controller concerning one Embodiment of this invention. It is a schematic diagram explaining the signal state of the cutoff controller concerning one Embodiment of this invention. It is explanatory drawing which shows the state of the driving speed of the printing press concerning one Embodiment of this invention. It is a graph explaining the function of the compensation position setting means concerning one Embodiment of this invention. It is a flowchart which shows the function of the compensation position setting means concerning one Embodiment of this invention. It is a graph explaining the function of the compensation position setting means concerning one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printing machine 2 Mark 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 Compensation position setting means 49 Detector position control means 51 Detection timing control means 63 image data

Claims (6)

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;
A compensator roller that changes the travel path length of the web by moving the position;
The position of the compensator roller is changed 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 to adjust the cutting position of the web by the cutting means. A printing machine equipped with a cutting control means,
The initial position of the compensator roller when the cutting control means starts the cutting control operation is set based on the correlation between the setting speed of the compensator roller corresponding to each of the production speed and a predetermined speed lower than the production speed. An initial position setting means is provided. Relative positional relationship acquisition means for selecting the mark based on image data and calculating a relative positional relationship between the web traveling 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. The printing press according to claim 1, wherein:   If the speed at the start of the cutting control is substantially equal to the predetermined speed, the initial position setting means obtains the setting position of the compensator roller at the production speed and the predetermined speed in the previous operation from the logging data. 3. The printing machine according to claim 1, wherein mutual correlation data is created, and an initial position of the compensator roller at the start of the control is set based on the correlation data.   If the speed at the start of the cutting control is lower than the predetermined speed, the initial position setting means determines the setting position of the compensator roller at the production speed and the predetermined speed in the previous operation from the logging data. The acquired correlation data is created, and the initial position of the compensator roller at the start of the control is estimated and set based on the correlation data. Printer.   If the speed at the start of the cutting control is lower than the predetermined speed, the initial position setting means determines the setting position of the compensator roller at the production speed and the predetermined speed in the previous operation from the logging data. The acquired correlation data is created, and the initial position of the compensator roller at the start of the control is set using an interpolation method based on the correlation data. Printing machine. 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 5 to 6.

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