JP2015123576A - Cutting controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting controller capable of improving follow ability of compensation when positional deviation of a cutting position occurs.SOLUTION: A cutting controller for controlling a cutting position when it cuts a web 10 on which patterns are printed at predetermined interval at each pattern comprises: a cutting unit 1 having at least one cutting blade 12 for cutting the web 10 between the patterns; a first detector 2 disposed on an upstream side of the cutting unit 1 on a transport path of the web 10 and detecting a specification part for specifying the positions of the respective patterns on the web 10; and a control part 3 for controlling cutting operation by the cutting blade 12, on the basis of the specification part detected by the first detector 2.

Description

  The present invention relates to a cutting control device.

  A web printed with a pattern or the like by a rotary printing machine or the like is cut between the patterns by a cutting device to form a printed sheet on which each pattern is printed. At this time, a cutting control device is mounted on the cutting device so that the pattern does not shift in each printed matter. As such a cutting control device, various devices have been proposed. For example, a cutting control device as shown in Patent Document 1 has been proposed.

  This cutting control device controls a cutting position by setting a web on which a mark is printed between adjacent pictures as a cutting target and detecting the mark. More specifically, the mark is detected by a detector disposed in the web conveyance path, and the rotational position of the cutter cylinder is detected. If the cutting position by the cutter cylinder is shifted based on the detected mark position, the shift is corrected.

  In the above apparatus, a compensator roller is used when the cutting position is corrected. The compensator roller is arranged on the upstream side of the cutting position, and is supported so as to be movable in parallel with the web being stretched. Thus, the movement of the compensator roller adjusts the web conveyance path length and corrects the cutting position.

JP 2004-18192 A

  By the way, the apparatus using the above compensator roller has the following problems. First, in the above apparatus, since the web conveyance path length is adjusted by driving the compensator roller, and the cutting position is corrected as a result, it takes time until the correction. For this reason, there is a problem that the followability of correction is low and accurate correction cannot be performed. Further, since the tension of the web is changed by the movement of the compensator roller, there is a possibility that the web may be damaged if it is suddenly moved. For this reason, the compensator roller cannot be moved at a high speed, and this also causes a decrease in follow-up performance.

  The present invention has been made to solve the above-described problem, and provides a cutting control device capable of improving the followability of correction when the cutting position is displaced and performing accurate correction. With the goal.

  The present invention is a cutting control device that controls a cutting position when a web on which a pattern is printed at a predetermined interval is cut for each pattern, and includes at least one cutting blade that cuts the web between the patterns. A cutting unit, a first detector that is arranged upstream of the cutting unit in the web conveyance path and detects a specific portion that specifies the position of each pattern on the web, and is detected by the first detector And a control unit for controlling a cutting operation by the cutting blade based on the specified part.

  According to this configuration, when the web is cut, the first detector located upstream of the cutting unit detects the specific portion that specifies the position of the pattern, and based on this, the cutting operation by the cutting blade is controlled. doing. That is, since the cutting operation of the cutting blade is directly controlled, the followability of the cutting control after the specific part is detected by the first detector is higher than that of the compensator roller as in the conventional example. Therefore, when a cutting position shift occurs, the position shift can be accurately corrected at high speed. Further, since it is not necessary to change the tension of the web as in the conventional example, it is possible to control cutting without damaging the web such as breaking of the web.

  Note that the “picture” according to the present invention is not only a picture but also a printed display of various forms such as characters. In addition, the “specific part for specifying the position of the pattern” may be, for example, a cutting register mark printed between adjacent patterns, but may also be a specific position of the pattern, for example, an end of the pattern or It is also possible to detect the portion where the shading changes in the pattern as the specific portion. In this case, not only one specific unit but also a plurality of specific units can be detected. By doing so, for example, even if one specific part cannot be detected due to dirt or the like, the cutting position can be controlled based on detection by another specific part.

  In the cutting control device, the cutting operation can be controlled in various ways. For example, the control unit can control the cutting timing by the cutting blade.

  In each of the cutting control devices described above, the cutting unit can include various types of cutting blades. For example, the cutting unit includes a rotary cutter having at least one cutting blade, and the web is cut by rotating the rotary cutter. It can be performed. If such a cutting blade is configured to perform a circular motion, it can cope with a high web conveyance speed. In addition, a cutter that performs a box motion type operation can also be used to perform a circular motion.

  In the case of using the rotary cutter as described above, for example, the cutting unit includes a second detector that detects a rotational position of the cutting blade, and the control unit detects the specific unit detected by the first detector. And the phase of the cutting blade with respect to the cutting position of the web can be corrected based on the rotational position of the cutting blade detected by the second detector.

  The said cutting control apparatus WHEREIN: The said control part can correct | amend the phase of the said cutting blade by adjusting the rotational speed of the said rotary cutter. In this case, the rotation speed of the rotary cutter is adjusted after the one cutting blade cuts and before the next cutting blade cuts. When the next cutting blade cuts, the rotary cutter rotates. The speed (circumferential speed) is controlled so as to coincide with the web conveyance speed.

  In each of the cutting control devices, the first detector is disposed within the reference distance from the cutting position of the web by the cutting unit, where a distance of one pitch between adjacent pictures is a reference distance. be able to. In this way, it is possible to detect a position shift immediately before cutting, that is, a position shift generated in one pattern, and control the cutting position based on the detected position shift. For this reason, there are the following advantages. For example, if the first detector is arranged at a plurality of pitches before the cutting position, an accumulated shift of a plurality of patterns will be detected, but the first detector is arranged within one pitch from the cutting position as described above. Then, since the shift | offset | difference which generate | occur | produced in one pattern can be detected, more exact position shift correction | amendment can be performed.

  According to the cutting control device according to the present invention, it is possible to improve the follow-up performance of correction when the cutting position is displaced.

It is a top view of the web made into object with the cutting control device concerning one embodiment of the present invention. It is a schematic block diagram of the cutting control apparatus which concerns on one Embodiment of this invention.

  Hereinafter, an embodiment of a cutting control device according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a cutting control device according to the present embodiment.

<1. Web>
The cutting control device according to the present embodiment is a device that cuts between patterns on a web on which a pattern has been printed by a rotary printing press and forms a printed matter for each pattern. First, the web will be described. As shown in FIG. 1, a web 10 targeted in the present embodiment is obtained by printing a plurality of patterns 101 on a sheet material such as paper or a resin film at predetermined intervals in the length direction X of the web. It is. A reference cutting position Z to be cut with a cutting blade described later is set between the adjacent patterns 101. The pattern 101 has been subjected to various types of printing such as photographs, illustrations, and characters. A mark 102 for detection by a mark detector described later is printed between adjacent pictures 101. The form of the mark 102 is not particularly limited as long as it can be detected by the mark detector, and can be various forms such as a figure as well as a line as shown in FIG. In the present embodiment, a one-pitch distance S between adjacent patterns 101 is referred to as a reference distance.

<2. Cutting control device>
Next, the cutting control device will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of the cutting control device. As shown in the figure. The cutting control device includes a rotary cutter 1 that cuts the web 10 at a predetermined interval, a mark detector (first detector) 2 disposed on the upstream side of the rotary cutter 1 in the conveyance path of the web 10, and And a control unit 3 for controlling the cutting operation by the rotary cutter 1. The rotary cutter 1 includes a cylindrical base portion 11 that is rotatably supported, and a plurality of cutting blades 12 that are arranged on the outer peripheral surface of the base portion 11 at predetermined intervals. Are arranged so as to extend radially from the axis of the base 11. Then, while the rotary cutter 1 rotates, each cutting blade 12 continuously cuts the reference cutting position Z between the patterns 101 on the web 10. A rotary encoder (second detector) 4 is attached to the base 11 of the rotary cutter 1 so that the rotational position of the rotary cutter 1 is output as a rotation signal composed of pulses.

  In addition, the number of the cutting blades 12 provided in the rotary cutter 1 is not particularly limited. In the example of FIG. 2, the four cutting blades 12 are arranged every 90 degrees. However, for example, six cutting blades can be arranged at 60 degrees, and two cutting blades can be arranged at various intervals such as every 180 degrees. It is also possible to have only one cutting blade.

  The mark detector 2 detects the mark 102 on the web 10 described above, and outputs a detection signal when the mark 102 is detected. As such a mark detector 2, various sensors, such as a color mark sensor, an infrared sensor, and an ultrasonic sensor, can be used as long as the mark 102 can be detected. Further, the mark detector 2 is disposed within the reference distance S from the cutting position of the web 10 by the cutting blade 12 to the upstream side of the web conveyance path.

  Next, control of the cutting control device will be described. The control unit 3 of the cutting control device can be configured by a known computer such as a PLC (Programmable Logic Controller). In order to control cutting, the rotation signal output from the rotary encoder 4 and the detection signal output from the mark detector 2 are received in real time, and based on this, the web by each cutting blade 12 of the rotary cutter 1 is received. 10 cutting timings are controlled. That is, the rotational drive of the rotary cutter 1 is controlled so that the predetermined timing of the rotation signal and the timing of the detection signal coincide or become a predetermined difference, whereby each cutting blade 12 is at the reference cutting position Z of the web 10. Try to cut. Moreover, the conveyance speed of the web 10 and the peripheral speed of the rotary cutter 1 are made to correspond so that the web 10 can be cut | disconnected smoothly. At this time, the conveyance speed of the web 10 is input from the rotary printing press to the control unit 3.

<3. Operation of the cutting control device>
Next, the operation of the cutting control device configured as described above will be described. When the web 10 printed by the rotary printing machine is carried out, the rotary cutter 1 rotates and the web 10 is cut by the cutting blades 12 at the reference cutting position Z between the patterns 101. As a result, the web 10 is divided into sheet-fed printed matter on which one picture 101 is printed, and a process such as bundling is performed by an apparatus not shown.

  At this time, the control unit 3 controls the driving of the rotary cutter 1 so that the peripheral speed of the rotary cutter 1 matches the conveyance speed of the web 10 by an input from the rotary printing press. At the same time, based on the rotation signal and the detection signal, the driving of the rotary cutter 1 is controlled so that the actual cutting position by the cutting blade 12 matches the reference cutting position Z on the web 10.

  When the actual cutting position by the cutting blade 12 deviates from the reference cutting position Z on the web 10, that is, the deviation between the predetermined timing of the rotation signal and the timing of the detection signal is not less than a predetermined value (in particular, Although it is not limited, for example, when it is detected that the rotation signal is 1 to 500 pulses away, the rotational speed of the rotary cutter 1 is adjusted so as to correct this. Specifically, the rotational speed of the rotary cutter 1 is adjusted after one of the plurality of cutting blades 12 cuts the web 10 and before the next cutting blade 12 cuts. That is, when the cutting position by the cutting blade 12 is shifted forward in the transport direction, the rotational speed is decreased, and when the cutting position is shifted backward, the rotational speed is increased. Then, after the rotation speed is adjusted, when the next cutting blade performs cutting, the peripheral speed of the rotary cutter 1 is controlled to coincide with the conveyance speed of the web 10.

<4. Features>
As described above, according to the present embodiment, when the web 10 is cut, the mark 102 on the web 10 is detected by the mark detector 2 arranged on the upstream side of the rotary cutter 1, and the cutting is performed based on the mark 102. The cutting operation by the blade 12 is controlled. That is, since the cutting operation of the cutting blade 12 is directly controlled by the control unit 3, the followability of the cutting control after the mark 102 is detected by the mark detector 2 as compared with the compensator roller as in the conventional example. Is expensive. Therefore, when a cutting position shift occurs, the position shift can be accurately corrected at high speed. Further, since it is not necessary to change the tension of the web as in the conventional example, it is possible to control cutting without damaging the web such as breaking of the web.

  In particular, since the mark detector 2 is arranged within the reference distance S from the cutting position by the cutting blade 12, it detects a position shift immediately before cutting, that is, a position shift generated in one pattern. Based on this, the cutting position can be controlled. For example, if the mark detector 2 is arranged a plurality of pitches before the cutting position, the accumulated shift of the plurality of patterns 101 is detected. As described above, the mark detector 2 is placed within one pitch from the cutting position. When arranged, it is possible to detect a shift generated in one pattern. That is, since the cutting position can be corrected for each pattern, the web 10 can be cut more accurately.

<5. Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible unless it deviates from the meaning.

<5-1>
In the above embodiment, the mark 102 arranged between the patterns is detected by the mark detector 2, but the present invention is not limited to this. That is, as long as the position of the pattern 101 can be specified, it can be adopted as appropriate. For example, the edge of the pattern 101 can be detected, or a predetermined location in the pattern 101 can be detected. The predetermined part in the pattern 101 is, for example, a boundary or region having a large difference in shading, and is not particularly limited as long as it can be detected by the detector 2. Such a mark for specifying the position of the pattern 101, the edge of the pattern, and a specific location in the pattern correspond to the specifying unit of the present invention.

  And the position of such a specific part is not specifically limited. For example, in FIG. 1, the mark 102 and the reference cutting position Z coincide, but the position of the mark 102 is not limited to this, and the mark 102 may be arranged at any position in the transport direction X, and the width of the web 10. It may be any position in the direction. This is the same even if the specific part is an aspect other than the mark.

  Further, instead of detecting one mark or the like of the web 10, it is also possible to detect a plurality of marks or the like. In this way, for example, when detecting a plurality of marks or the like, the position of the pattern can be detected if the mark or the like can be detected at one place even if the mark cannot be read due to dirt or breakage of the web. .

<5-2>
In the above embodiment, the cutting unit using the rotary cutter 1 for cutting the web 10 has been described. However, the present invention is not limited to this as long as the web 10 can be cut. For example, a cutting unit having a cutting blade that performs a motion box type circulation motion may be used.

<5-3>
In the above embodiment, the mark detector 2 is disposed within the reference distance S from the rotary cutter 1 on the upstream side of the web conveyance path, but the mark detector 2 is not limited to this position. For example, the mark detector 2 can be arranged at a position away from the rotary cutter 1 by the reference distance S or more. However, in order to increase the accuracy of the cutting position, it is preferable to arrange the cutting position within the reference distance S from the rotary cutter 1 as described above.

<5-4>
In the above embodiment, the rotary position of the rotary cutter 1 is detected using the rotary encoder 4, but other sensors may be used as long as the cutting timing of the cutting blade 12 can be detected. What is necessary is just to select suitably with respect to a cutting blade.

<5-5>
In the above embodiment, the cutting of the web carried out from the rotary printing press has been described, but it is needless to say that the present invention can also be applied to a web carried out from other printing presses.

10 Web 101 Pattern 102 Mark (specific part)
1 Rotary cutter 12 Cutting blade 2 Mark detector (first detector)
3 Control unit 4 Rotary encoder (second detector)
S Reference distance

Claims (6)

A cutting control device for controlling a cutting position when cutting a web on which a pattern is printed at a predetermined interval for each pattern.
A cutting unit having at least one cutting blade for cutting the web between the patterns;
A first detector that is disposed upstream of the cutting unit in the conveyance path of the web and detects a specific portion that identifies the position of each of the patterns on the web;
A control unit for controlling a cutting operation by the cutting blade based on the specific unit detected by the first detector;
A cutting control device comprising:   The cutting control device according to claim 1, wherein the control unit controls a cutting timing by the cutting blade.   The cutting control device according to claim 1, wherein the cutting unit includes a rotary cutter having at least one of the cutting blades, and performs cutting of the web by rotation of the rotary cutter. The cutting unit includes a second detector that detects a rotational position of the cutting blade;
The controller controls the phase of the cutting blade relative to the cutting position of the web based on the position of the specific part detected by the first detector and the rotational position of the cutting blade detected by the second detector. The cutting control device according to claim 3, wherein   The cutting control device according to claim 4, wherein the control unit corrects a phase of the cutting blade by adjusting a rotation speed of the rotary cutter. The distance of 1 pitch between the adjacent pictures as a reference distance,
6. The cutting control device according to claim 1, wherein the first detector is disposed within the reference distance from a cutting position of the web by the cutting unit.

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