CN1146826C - Device and method for checking patterns disposed on a material strip and the material strip - Google Patents

Abstract

The present invention relates to a method and a device for detecting patterns (1) on a material band (30), and the patterns (1) contain a plurality of groups of dark and bright regions (2, 2*, 3 and 3*) in a detection travelling direction (V). The detection comprises the steps that a group of dark regions (2 and 3) and/or bright regions (2* and 3*) relevant to a detector corresponding to the position of another group of dark regions and/or bright regions relevant to other detectors (8 and 9) is moved so as to be beneficial to the detection of the existence/nonexistence of the dark regions (2 and 3) and/or the bright regions (2* and 3*); an output signal sequence is generated according to the detected result; output signals are combined and contain the information of the dark regions or bright regions (2, 2*, 3 and 3*) relevant to the detectors (8 and 9), and the output signals are obtained by detecting one of the dark regions and/or the bright regions (2, 2*, 3 and 3*) in a preset mode according to the detectors (8 and 9), for example, the detectors (8 and 9) are alternately started with another detectors (8 and 9); the output signal sequence is compared with a preset signal sequence.

Description

Apparatus and method for checking patterns on a material strip and the material strip

technical field

The invention relates to a method and device for checking patterns on a material belt by using photoelectric or other devices and the material belt.

Background technique

In the prior art, the control marks printed on the strip are used to control the processing operation on a moving material belt, and can be detected by photoelectric or other optical devices. These patterns on the material belt are usually compared with the surrounding Tone printing, in order to facilitate the detection device to detect the correct position of the pattern and thus define the current position of the material strip, these patterns can also be made of magnetically sensitive materials, or use patterns that can be sensed by mechanical devices, such as holes, traces, long holes etc.

By detecting the correct position of the material tape, it is possible to apply multi-color printing on the material tape and adjust the position of the pictures. These pictures contain a variety of colors printed on the material tape by using several processors. Each processor will be used during the manufacturing process. Specific colors are printed on the picture, and other processors in the process print other colors on the material tape. Therefore, a multi-color picture can be produced and printed on the material tape, where the different colors are in the correct position. stack.

The inspection device or inspection method is also used to detect the correct position of the material strip, to facilitate the application of a specific printed design at a specific point on the top surface of the pre-printed material strip, or to facilitate the placement of a printed design and a trace line , so that they align with each other and collapse.

Other areas of existing applications, such as a web of packaging material running over the full length of the design in a packaging machine or the like, to facilitate on the one hand to obtain the printed design in the same position on the entire package, on the other hand The trace line can be overlapped with the forming device of the packaging machine, and the folding of the material can be carried out along the pre-positioned trace line. In order to make a material belt, such as punching, applying openings or other trace lines, it is necessary to know the material correct position of the belt.

As far as we know, the pattern detected by the sensor can be set in front of the material to judge the correct position of the belt. For example, the EP-A-0131241 patent uses a barcode pattern. The barcode has two sets of dark and light areas and is along the detection direction. Proceeding, wherein the position of one set of dark and/or bright regions relative to one detector corresponds to the displacement of another set of dark and/or bright regions relative to another detector. These detectors detect the presence or absence of dark and/or bright areas respectively, and generate output signals according to the detection results. This method uses one detector to activate when dark and/or bright areas are detected, and the other The detector detects the presence or absence of dark and/or bright areas, wherein the output signal of the second detector is compared with a predetermined signal sequence, and if the output signal sequence is equal to the predetermined signal sequence, the comparator outputs a trigger signal in order to activate the above-mentioned processors that require the correct position of the material tape.

These patterns usually interfere with the appearance of a tape pattern, so the control pattern needs to fit within the existing pattern, or on a very small blank surface. Basically, this surface only contains the control pattern, but this will poses a huge problem because the element used to sense the pattern will detect and register all parts of the pattern as well as the control pattern, so that the second detector will provide a lot of information depending on the dark and/or light areas of the pattern and the control pattern. Output signals, and because these output signals need to be compared in a real-time process, it is very easy to cause false signals due to the unnecessary identification of the dark and/or bright area sequence of the decorative sample and the predetermined signal sequence time, resulting in the detected material The tape is in the wrong position, and the processor then destroys the pattern or material tape by getting the wrong data.

Another problem is that the control pattern should be as small as possible, so as not to interfere optically with the pattern, but to avoid detection of false signals.

Furthermore, the packaging industry needs to be independent of any control pattern and for example use the pattern itself to detect the pattern of the material strip.

Contents of the invention

The object of the present invention is to provide a device and method for correctly and safely checking a pattern on a material strip, for example, to accurately detect the correct position of the material strip.

Another object of the present invention is to increase the stability of the inspection device without increasing the size of the control.

Yet another object of the present invention is to provide a method and device for detecting the correct position of the material strip without any other control pattern that interferes with the material strip decoration pattern.

Furthermore, it is an object of the present invention to increase the stability of the method and apparatus independently of the position of the control pattern and to use the outputs of the detectors synergistically.

The present invention provides a device for inspecting a pattern located on a material belt, the pattern comprising an array of dark and light areas along the direction of travel of the inspection, wherein no displacement occurs between the detectors in the direction of travel of the inspection Next, the position of one group of dark and bright regions is displaced relative to another group of dark and bright regions. These detectors detect the existence of dark and bright regions and generate output signals according to the detection results. The comparator comparing a sequence of output signals to a predetermined sequence of signals, wherein: a) said comparator is directly connected to at least two detectors; b) a dark or bright region representing the output signal is fed from at least two detectors to said comparator; c) said dark or bright regions representing the output signals of said at least two detectors are combined to form an output signal sequence; and d) said comparator will output said combined sequence of signals A predetermined sequence of signals is compared, and if the two sequences are similar, an output signal of the comparator is generated.

The invention provides a method for inspecting a pattern located on a material web, the pattern comprising an array of dark and light areas, said dark and light areas having different optical properties, said individual areas traveling in an inspection direction, wherein The method comprises the steps of: (a) displacing the position of one set of dark and bright regions relative to another set of dark and bright regions without displacement of the detectors relative to each other in the direction of travel of the inspection; ( b) detecting the presence of dark and bright regions; (c) generating output signals related to said detection results; and (d) comparing the sequence of said output signals to a predetermined sequence of signals, wherein the dependence is formed in a predetermined manner The sequence of output signals of at least two detectors for the detection of dark or bright areas, so that said sequence is compared with a predetermined signal sequence, and said sequence of output signals of said detectors is compared with said predetermined The order of the signals so that if the two orders are similar, the output signal of the comparator is produced.

The present invention provides a material web for preparing packages, said material web comprising a plurality of sets of dark and light areas arranged in a predetermined manner for further processing and/or disposal of the material web, wherein a first set of dark areas and light areas and a second set of dark and light areas are arranged symmetrically around a common center line, one intermediate dark area of said first set having a width and one intermediate light area of said second set having a width, arranged In the center of each group, the light and dark regions of the first group having the width are alternately arranged on both sides of the middle dark region, and the dark regions of the second group having the width and bright areas are arranged alternately on both sides of the middle bright area, the width value of the dark area and bright area of the first group is usually twice that of the dark area and bright area of the second group and the first set contains at least 3 dark regions and the second set contains at least 5 bright regions.

The present invention utilizes the output signals of at least two detectors, and combines the output signals into an output signal sequence according to a predetermined method, wherein each detector can activate the other detector, so that the edge detection result of a black or light color area will be The output signal is written into a comparator, and the order is compared with a predetermined order, wherein the output signal contains information related to the black and/or light area.

This can be achieved by combining the output signals of the two detectors in a comparator. When one of the detectors detects a dark area, a signal (such as "1") is written to the comparator, and a bright area is detected. In the zone, another signal (such as "0") is written into the comparator, and when the obtained output signal sequence is the same as a predetermined signal sequence, one or more actuators are activated.

It is also possible to use the output signal of one detector as a clock input of a comparator, so that a data input of the comparator can be used to write the output signal of the other detector into the comparator, wherein the clock input is in one of the dark and/or or an edge detection of the bright area, and vice versa, in order to improve the stability of the system, the clock input can also be used as an output signal of the output signal sequence, which is compared to a predetermined signal sequence and depends on Transitions from light to dark and from dark to light areas, as a result, the comparator can receive several output signals from multiple detectors, more helpful in preventing detection of false signals, i.e. on the same strip as the sequence of the control pattern A sequence of dark and light areas was detected within the pattern of the pattern, while the control pattern was mistakenly detected. When the output signal sequence is the same as the predetermined signal sequence, the comparator outputs an output signal, wherein the output signal activates one or more actuators of different tape processors. The above mentioned clock input may be provided by a detector depending on the moving web, which may be a relatively large white and black area and the rotation sequence of a wheel supporting the traveling web or equivalent.

The comparator may include a shift register, which registers the correct length of information given by the detector when detecting the control pattern, so that the comparator can output signals when the output signal is the same as the predetermined signal sequence.

The method can handle more signals, preferably binary signals, in order to distinguish a correct pattern from a wrong pattern without enlarging the required pattern area on the material tape.

The method for checking the pattern can be carried out by means of the above-mentioned or similar devices, wherein the pattern on the material web and which can be detected by the inspection device can have mechanical, electronic, magnetic and/or optical properties, and can be mechanically, electronically, magnetically and/or optically Magnetic and/or optical sensor and detector detection.

The dark and/or light areas of the material tape can be part of the picture, pattern or arrangement shape, and do not need to be separated from the control pattern on the material tape. Therefore, it can use the bar code of the light and dark area, because these areas The detection is more reliable, wherein the dark and light areas of one group of patterns can be displaced relative to the dark and light areas of the other group with respect to the corresponding detector, if the detectors are mutually displaced, for example on the top of the finished package The two sets of patterns can be at the same height of the material web if the detector is displaced relative to the pattern and itself.

Sometimes it is helpful for the comparator to distinguish the pulse derived by the first detector from the output pulse derived by the second detector (i.e. other field sets), to solve this problem, the pulse of the first detector can be higher and/or longer, or may be followed by a shorter secondary pulse and/or positive and negative (reverse) going pulses, respectively.

Description of drawings

Preferred examples of the present invention can be described with reference to accompanying drawings, wherein

Figure 1 discloses a schematic structure of an inspection device with a control pattern,

Figure 2 reveals the preferred size of the control pattern,

Figure 3 reveals the detector output signal and the resulting signal sequence within the comparator,

Figure 4 discloses another example related to Figure 2,

Figure 5 discloses another example related to Figure 2,

Figure 6 reveals two groups of control patterns that are shifted relative to each other,

Figure 7 reveals different patterns on the material tape as a control pattern, and

FIG. 8 shows a schematic diagram of a processor and a set of control patterns.

Detailed ways

The top of Fig. 1 discloses a pattern 1 with a dark area 2 on the right (first group) and a dark area 3 on the left (second group), and consists of a bright area 2* on the right and a dark area on the left, respectively. The bright area 3* is separated, and the dark areas 2 and 3 are connected by the connection area 4, wherein the dark area 2 is horizontal and the connection area 4 is vertical at 90 degrees on the material belt. The dark area 2 on the right has a width x, and the bright area 2* on the right has a width y, the dark and bright areas 3, 3* on the left have widths a, b respectively, and the edge 32 of the dark area 2 on the right has a width a, b, respectively. The distance between the edge 31 of the side dark area 3 is d, this arrangement can constitute a barcode used as a control pattern, and detect the correct position of the material belt moving in the direction v.

The control pattern is detected by two detectors 8, 9, and the detector can generate a binary pattern when detecting the dark and/or bright area 2, 2*, 3, 3* or the edge 31, 32 of the dark and/or bright area Output signals, wherein these output signals are sent to a comparator 10, the output signal sequence is compared to a predetermined signal sequence, the data input 13, 16 can be respectively passed through the clock input 12, 15, so that the detector 8 or 9 can make it The output signal is written to the comparator 10, whereby the output signal sequence is generated.

When the detector 8 detects a dark area 3, the detector 8 can pass the data input 16 through the clock input 15, wherein the detector 9 detects a bright area 2* at the same time, and in the data input 16 provides the respective information to the comparison device 10. When detecting the edge of a dark area 2, the detector 9 can make the data input 13 receive the information of a detected dark area 3 from the detector 8 in the clock input 12, and this process is repeated until all dark areas 2, 3 and/or bright areas 2*, 3* have been detected, and each information is sent to the comparator 10 until. If the sequence of the output signals from the detectors 8, 9 is identical to a predetermined signal sequence, the output 17 is activated and the signal is sent to one or more actuators 20 which process the material web, formed by the material web or packaging. A pipe fitting moves backward.

It will be appreciated that the output signal of detector 8 or 9 or both may be used in comparator 10 to generate a sequence of output signals.

Figure 2 reveals two groups of dark areas (2, 3) such as black areas and bright areas (2*, 3*) such as white areas, the two groups are symmetrical according to a central line M, and the central line is perpendicular to The moving direction v of the thin material (parallel to the v-axis), the middle dark area 3 of the first group I and the middle light area 2* of the second group II are spanned by the central line M, which is not shown on the thin material. As shown in Figure 2, on both sides of the central line M, the middle dark area 3 and its adjacent bright area 3* have twice as much space as the middle bright area 2*, its adjacent dark area 2, and the next bright area 2* and dark area. The width of both regions, where the width (a, b) of the first set of dark/light regions (3, 3*) is greater than the width (x, y) of the second set of dark/light regions (2, 2*) double.

Fig. 3 discloses the generation of an output signal sequence, wherein detectors 8, 9 generate binary signals when detecting dark and bright areas, and if detector 8 detects a transition from light to dark, it writes a "1" in Comparator 10, and when detector 9 detects a transition from light to dark, it writes a "1" in comparator 10, and if detector 8 detects a transition from dark to light, it writes a "1" 0" at comparator 10, and detector 9 as well. In this way, the output signals of the two detectors are combined in a predetermined way, that is, the sequence of "1" and "0" given by the shape and design of the barcode, wherein the sequence disclosed in Figure 3 is "11001101001100", here at the two poles A 14-bit sequence can be achieved within a small and narrow barcode, and since both detectors write their output signals to the comparator 10, it is easy to understand that more detectors and patterns are available for the predetermined output signal sequence The number of bits is increased, thus improving the stability of the inspection device.

The generation of another output signal sequence is disclosed in Fig. 4, wherein the detectors 8 and 9 can generate binary signals when detecting dark and bright areas, if the detector 8 receives a "1" input as the clock signal C When, the existing information of detector 9 (being " 0 " at this moment) promptly sends into comparator 10, if detector 9 receives a signal also as clock input C, the existing information of detector 8 (here When it is "1"), it is sent to the comparator 10. After detecting the entire barcode as a control pattern, the comparator receives the 14-bit input "01100111100110", which is more than 11 binary output signals.

This output signal sequence composed of binary signals is compared to a predetermined signal sequence to activate the actuator 20, usually the first "0" is not used, because the first transition from light to dark may Too close to the decoration, therefore, the comparator should contain a 13-bit data.

It can be seen from the above method that the data received from the same control pattern is extended to 13 bits, thereby improving the stability of the detection method, so the existing barcode can be used in a better way. The material belt moves at a speed of hundreds of meters per minute. The photocells used as detectors 8 and 9 can detect light and dark areas at a frequency of about 10KHz. Therefore, the speed of the photocells is quite high enough to read the moving forward at the above speed. Pattern 1 on the material belt, the width (a, b, x, y) of the bright and dark areas can be reduced to the minimum, so that the user of the detection device and detection method can use a very small pattern without interfering with the material belt The optical appearance of a decorative pattern, wherein the normal width a of a group of continuous dark areas 3 is approximately the same as the width b of the same group of continuous bright areas 3*, a, b are approximately the width x, twice the y. The width x of the continuous dark area is roughly the same as the width y of the continuous bright area, usually 1 to 3mm, wherein the smaller or larger width can be detected according to the light source supplied to the photocell or the magnetic density of the magnetic pattern on the material tape.

In order to produce the sequence of output signals shown in FIG. 4, the edges of the dark and light areas need to be located on the band 30 and relative to their detectors 8, 9 so that when a detector 8 or 9 detects, for example, the edge 32 of the first group , the other detector 8 or 9 will not detect the edge of another group of black and white areas. Experience shows that the increased number of check bits in the comparator 10 will increase the stability of the check method.

FIG. 5 shows another example of the inspection method, in which both the output signals of the detectors 8 and 9 are used, so the order of the output signals that can be received is: 1011 0100 1011 01110100 1011 0100.

Here it can be found that depending on the method using the output signal, the stability of the inspection method can be increased rapidly by using the same control pattern, here by the detection of dark areas 2, 3 and/or by the positive edge (from light to dark) ) is denoted by "1", while the output signal derived from the detection of bright areas 2*, 3* and/or from the detection of negative-going edges (from dark to bright areas) is denoted by " 0" means.

Fig. 6 discloses a configuration of control patterns, wherein the dark and light area groups are mutually shifted according to their corresponding detectors 8, 9, therefore, different pattern groups can be set at different positions on the material belt, so as to prevent the user from setting Barcodes on the material tape interfere with the optical image of the decoration.

In addition, the decorative sample itself can also be used as an inspection method. As shown in Figure 7, a specific decorative sample preferably includes white and black areas, which is used as the aforementioned inspection method, wherein each group of white and black areas is determined according to its corresponding detector. Instead, they are displaced relative to each other, so that the dark and/or bright areas are part of the picture, pattern or arrangement on the material strip.

Figure 8 discloses the use of a detector 8 to detect white and black areas on the material belt, while the material belt is moved forward by the operation wheel 31, the detector 8 is located under a wheel 31 rotating at a specific speed, the advancement of the material belt 30 The speed can be detected by the detector 9, that is, the rotational speed of the wheel 31 can be measured, and the same result as above can be obtained through the interaction of the two detectors. Depending on the speed of the material web, the detectors 9 can be placed at different positions within the processing line, or replaced by existing sensors or detectors.

Claims (24)

1. one kind is used for checking the device that is positioned at the pattern (1) on the material web (30), and this pattern (1) (v) comprises array dark space and area pellucida (2,2 along the direct of travel of checking ^*3,3 ^*), wherein (v) go up under the situation that detector (8,9) is not subjected to displacement each other one group of dark space (2) and area pellucida (2 at the direct of travel of checking ^*) the position organize dark space (3) and area pellucida (3 with respect to another ^*) and by displacement, these detectors (8,9) are surveyed dark space (2,3) and area pellucida (2 ^*, 3 ^*) existence, and produce output signal according to the result who surveys, wherein comparer (10) is compared to the prearranged signal order with the order of output signal, wherein:

A) described comparer (10) is directly connected at least two detectors (8,9);

B) represent the dark space (2,3) or the area pellucida (2 of output signal ^*, 3 ^*), be fed to described comparer (10) from least two detectors (8,9);

C) the described dark space (2,3) or the area pellucida (2 of the output signal of described at least two detectors of representative (8,9) ^*, 3 ^*), be combined to form the output signal order; And

D) described comparer (10) is compared to the prearranged signal order with the described built-up sequence of output signal, and if two orders are similar, then produces the output signal of comparer (10).

2. the device of claim 1, wherein two detectors (8,9) are in the described dark space of detecting described material web (30) (2,3) and described area pellucida (2 ^*, 3 ^*) between the edge time, the edge detection output signal is written in the described comparer (10).

3. the device of claim 2, the output signal of one of them detector (8,9), by means of the activation of another described detector (8,9) by this another detector (8,9) by indirect feed to comparer (10).

4. the device of claim 1, wherein said detector (8,9) is connected to the input end of clock (12,15) of described comparer (10), and these clock inputs make the data input pin (13,16) of described comparer (10) can detect the described dark space (2,3) and area pellucida (2 of described material web (30) at a detector in two detectors (8,9) ^*, 3 ^*) between the edge time receive output signal from another detector in two detectors (8,9).

5. the device of claim 4, wherein said input end of clock (12,15) detects zone (2,2 according to described detector ^*, 3,3 ^*) bright/dark or dark/during bright transformations, also be used as and be used to show described output signal output signal in proper order.

6. the device of claim 1, wherein said comparer (10) is when described output signal order is identical with described prearranged signals order, export an output signal (17), this output signal (17) activates at least one actuator (20) of banded processor and/or packaging machine.

7. the device of claim 1, detector wherein (8,9) also comprises the input end of clock that is used for surveying described material web (30) gait of march.

8. the device of claim 1, the shift register of wherein said comparer (10) generate described information signal order.

9. the device of claim 1, comparer wherein (10) comprise the device of the output pulse of the output pulse that is used for distinguishing a detector (8,9) and another detector (8,9).

10. one kind is used for checking the method that is positioned at the pattern (1) on the material web (30), and this pattern (1) comprises array dark space and area pellucida (2,2 ^*3,3 ^*), the optical characteristics in described dark space and area pellucida is different, described each edge, district inspection direction (v) advance, the method comprises the following step:

(a) (v) go up under the situation that detector (8,9) is not subjected to displacement each other, make one group of dark space (2) and area pellucida (2 at the direct of travel of checking ^*) the position organize dark space (3) and area pellucida (3 with respect to another ^*) and displacement;

(b) survey dark space (2,3) and area pellucida (2 ^*, 3 ^*) existence;

(c) produce and described result of detection output signal related; And

(d) order with described output signal is compared to the prearranged signal order, wherein

Form in a predetermined manner and depend at least two detectors (8,9) dark space (2,3) or area pellucida (2 ^*, 3 ^*) the output signal order of detection so that described order and prearranged signals order are compared, and

The described order of the output signal of described detector (8,9) is compared to described prearranged signal order, so that, then produce the output signal of comparer (10) if two orders are similar.

11. the method for claim 10, wherein in described at least two detectors (8,9) detects described dark space (2,3) or area pellucida (2 ^*, 3 ^*) one of the edge time, this detector is by the signal activation from another detector in described at least two detectors (8,9).

12. the method for claim 11, wherein the step of the result of detection output signal related of generation and each detector (8,9) is included in by described another detector (8,9) and detects described dark space or area pellucida (2,2 ^*, 3,3 ^*) one of the edge after, relevant described dark space or area pellucida (2,2 are provided ^*, 3,3 ^*) information, each detector (8,9) is alternately activated repeats aforesaid operations.

13. the method for claim 10, wherein said dark space (2,3) and described area pellucida (2 ^*, 3 ^*) comprise optical characteristics, and described detector (8,9) is surveyed described optical characteristics.

14. the method for claim 10, wherein said output signal comprises binary signal.

15. the method for claim 14, wherein use " 1 " to represent to detect described dark space (2,3) and/or detect the edge from the area pellucida to the dark space and the described output signal that obtains, and represent to detect described area pellucida (2 by detector with " 0 " by detector by detector ^*, 3 ^*) and/or detect the edge from the dark space to the area pellucida and the described output signal that obtains by detector, or represent to detect described dark space (2,3) and/or detect the edge from the area pellucida to the dark space and the described output signal that obtains, and represent to detect described area pellucida (2 by detector with " 1 " by detector by detector with " 0 " ^*, 3 ^*) and/or detect the edge from the dark space to the area pellucida and the described output signal that obtains by detector.

16. the method for claim 14, wherein said pattern (1) comprise two groups of dark spaces (2,3) and area pellucida (2 ^*, 3 ^*), the number in wherein said district is selected and the form that can provide more than 8 binary output signals is provided, so that form the described order of output pulse.

17. a material web (30) that is used for preparing package, described material web comprise the dark space (2,3) and the area pellucida (2 that are used for further processing and/or dispose material web (30) that many groups are settled in a predefined manner ^*, 3 ^*), wherein first group of dark space and area pellucida (3,3 ^*) and second group of dark space and area pellucida (2,2 ^*) settles symmetrically around common centreline (M), have dark space (3) in the middle of described first group of width (a) and have the described second group area pellucida (2, a centre of width (y) ^*), be arranged on the center of each group, have the described first group area pellucida (3 of described width (a) ^*) and dark space (3) alternately be arranged in described in the middle of two sides of dark space (3), and have described second group dark space (2) and the area pellucida (2 of described width (y) ^*) alternately be arranged in described in the middle of area pellucida (2 ^*) two sides, described first group described dark space and area pellucida (3,3 ^*) width (a) value be twice in described second group described dark space and area pellucida (2,2 usually ^*) width (y) value, and described first group comprise at least 3 dark spaces (3), and described second group comprise at least 5 area pellucidas (2 ^*).

18. the material web of claim 17 (30) is characterized in that: described dark space and/or area pellucida are the parts of picture, style and/or arrangement architecture on the described material web.

19. the material web of claim 18 (30), wherein said dark space and/or area pellucida (2,2 ^*3,3 ^*) be the part of bar code.

20. the material web of claim 18 (30), wherein said two groups of dark spaces and/or area pellucida (2,2 ^*3,3 ^*) all connected by the bonding pad (4) on the described material web (30).

21. the material web of claim 18 (30), wherein said one group dark space and/or area pellucida (2,2 ^*) by displacement and be separated in the described dark space and/or the area pellucida (3,3 of described another group on the described material web (30) ^*).

22. the material web of claim 18 (30), the wherein width (x) of first group continuous dark space (2) and same group continuous area pellucida (2 ^*) width (y) approximately identical.

23. the material web of claim 22 (30), the wherein width (a) of second group continuous dark space (3) and described second group continuous area pellucida (3 ^*) width (b) approximately identical, width (a, b) value approximately is twice in described first group continuous dark space and area pellucida (2,2 ^*) width (x, y) value.

24. the material web of claim 18 (30), wherein dark space and area pellucida (2,2 ^*3,3 ^*) the edge with respect to the locator meams of detector (8,9) for a detector (8,9) when detecting the edge another detector (8,9) can't detect the edge.

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