JP6413243B2 - Quality control system, quality control method, and program - Google Patents

Description

  The present invention relates to a quality control system, and more particularly, to a quality control system for identifying a roller that generates a defect from a defect generation cycle of a web-like sheet and removing the cause of the occurrence.

  Conventionally, a method for detecting a periodic defect in a web-like sheet has been proposed (for example, Patent Document 1).

  Patent Document 1 detects defects in a web-like object, calculates the distance between defects, determines the periodicity of defects using an autocorrelation function representing the frequency of the distance between defects, A method for detecting defects is disclosed.

Japanese Patent Laid-Open No. 02-74852

However, the method of Patent Document 1 is for determining the presence or absence of periodicity by a statistical method, and has a problem that the calculation method is complicated.
Moreover, the method of patent document 1 aims at discrimination | determination of the presence or absence of the periodicity of a defect, and does not disclose performing quality control using a periodicity.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to provide a quality control that identifies the roller generating the defect from the defect generation cycle of the web-like sheet and removes the cause of the occurrence. It is to provide a system and the like.

In order to achieve the above-described object, the first invention is a quality management system for managing the quality of a web material conveyed through a plurality of rollers, the storage means storing the circumference of the rollers, An imaging unit that images the web material conveyed through the plurality of rollers, a defect extraction unit that extracts defects from an image captured by the imaging unit, and the two defects extracted by the defect extraction unit A difference in coordinates in the length direction of the web material is obtained, it is determined whether the difference is substantially equal to the circumference of the roller stored in the storage means, and the difference is substantially the same as any of the circumferences of the plurality of rollers. and that there is no periodicity when unequal, the cause of the defect and the roller as the periodicity in the case substantially equal to the circumferential length of the difference is one of the rollers is present, identify the roller that causes the defective Do A quality control system characterized by comprising a period calculating means.

The image is an image of a range of the web material having a length that is at least twice the circumference of the roller having the maximum circumference.
Said period calculating means, the two defect width direction of the coordinate of the web material defects are substantially the same, determine the difference in the length direction of the coordinate of the web material, the difference is laid the circumference and substantially equal The roller is identified as the roller causing the defect.

  According to the first invention, it is possible to automatically specify a roller that causes a periodic defect occurring in a web material conveyed and processed via a plurality of rollers without manual intervention.

Each of the plurality of rollers is provided with a doctor, and further includes doctor driving means for driving the doctor of the roller identified as the cause of the defect by the period calculating means and removing the cause of the defect. It is desirable.
Preferably, the doctor driving means ends the driving of the doctor when the cause of the defect is removed and there is no defect that occurs at a period substantially equal to the circumference of the roller that causes the defect.

  The doctor drive means can automatically remove the cause of the roller defect that causes the defect specified by the period calculation means. The cause of the defect is, for example, a foreign matter such as glue attached to the roller, and the cause of the defect is removed by cleaning the roller with a doctor.

In addition, it is preferable to further include alarm means for outputting an alarm when the difference is substantially equal to the circumference of the roller stored in the storage means .
Preferably, the alarm unit stops the output alarm when there is no defect that occurs at a period substantially equal to the circumference of the roller that causes the defect .
The alarm means can notify the occurrence of a periodic defect.

The defect extraction means may determine the unevenness of the defect based on the color tone of the defect extracted from the image and limit the roller that causes the defect.
On the image, the color of the convex defect part and the concave defect part is, for example, a whitish tone if it is a convex defect, and a blackish tone if it is a concave defect. By doing so, it is possible to identify the irregularities of the defect.

Many of the causes of defects are deposits on the roller, so it is possible to determine whether the web material has passed the upper side or the lower side of the roller by identifying the unevenness of the defect. This makes it possible to limit the rollers that can cause defects.
For example, in the case of convex, the roller causing the defect can be limited to the roller installed on the lower side of the web material, and in the case of convex, the roller can be limited to the roller installed on the upper side of the web material.

The second invention is a quality control method for managing the quality of a web material conveyed through a plurality of rollers, the storage step storing the circumference of the roller, and the material conveyed through the plurality of rollers. A shooting step of shooting the web material, a defect extraction step of extracting defects from the image shot by the shooting step, and the coordinates in the length direction of the web material of the two defects extracted by the defect extraction step A difference is obtained, it is determined whether the difference is substantially equal to the circumference of the roller stored in the storing step, and if the difference is not substantially equal to any of the circumferences of the plurality of rollers, there is no periodicity. , the cause of the defect and the roller as the periodicity in the case substantially equal to the circumferential length of the difference is one of the rollers is present, cycle calculating scan identifying the roller causing the defective And a doctor driving step for driving the doctor of the roller identified as the cause of the defect by the period calculating step and removing the cause of the defect, respectively, It is the quality control method characterized by comprising.

A third invention is a program for causing a computer to function as a quality management system for managing the quality of a web material conveyed through a plurality of rollers, and the computer stores the circumference of the rollers. Storage means, image input means for inputting a photographed image of the web material conveyed through the plurality of rollers, defect extraction means for extracting defects from the photographed image input by the image input means, and extraction by the defect extraction means A difference in coordinates in the length direction of the web material between the two defects is determined, and it is determined whether the difference is substantially equal to a circumferential length of the roller stored in the storage unit, and the difference is determined by the plurality of rollers. of the no periodicity when any perimeter to be not substantially equally, the cause of the defect person as the periodicity in the case substantially equal to the circumferential length of the roller of the difference is either there And rollers, the period calculation means for specifying said roller causing the defective drives a doctor provided causative roller of the defects identified by the period calculation means, to eliminate the cause of the defect doctor This is a program for functioning as drive means.

  According to the present invention, it is possible to provide a quality control system or the like that identifies a roller generating a defect from the defect generation cycle of the web-like sheet and removes the generation cause.

The figure which shows the outline | summary of the quality control system 1 which concerns on embodiment of this invention. Block diagram showing a hardware configuration example of the control device 6 The flowchart which shows the flow of a process of the control apparatus 6. The figure which shows the structure of the roller circumference storage table 31 The figure explaining the defect 43 The figure explaining the example of composition of doctor 7 The flowchart which shows the flow of a process of a period calculation process (S105). Diagram explaining the irregularities of the defect

  Hereinafter, preferred embodiments of a quality management system 1 according to the present invention will be described in detail with reference to the accompanying drawings. In the following description and the accompanying drawings, the same reference numerals are given to components having substantially the same functional configuration, and redundant description will be omitted.

FIG. 1 is a diagram showing an outline of the quality management system 1.
The quality management system 1 is a system that performs quality management of the web material 2 that is conveyed and processed via a plurality of rollers 3.
The web material 2 is, for example, a material such as aluminum foil, PET (Polyethylene Terephthalate), propylene, nylon, etc., and the web material 2 wound in a roll shape is drawn out and conveyed through the roller 3 to perform various processing. Applied.

FIG. 1 shows an example of a processing step for the web material 2.
The web material 2 is conveyed in the direction of arrow A from the previous process or supply roll via the conveyance roller 3a, and the web 3 has been processed by applying processing such as applying glue to the web material 2 with the rollers 3b and 3c for processing. The material 2 passes through the conveying rollers 3d and 3e and proceeds to the next step or is wound on a winding roll.

In the quality control system 1 according to the present embodiment, the illumination 4 and the camera 5 for photographing the upper surface of the web material 2 are installed between the roller 3d and the roller 3e on the transport path after processing.
The illumination 4 is, for example, bar illumination, is provided in parallel with the width direction of the web material 2, and irradiates illumination light onto the upper surface of the web material 2 after processing.

  The camera 5 is a line sensor camera, for example, and is provided in parallel with the width direction of the web material 2. An image of the upper surface of the web material 2 is obtained by continuously photographing the web material 2 being conveyed by the camera 5.

The camera 5 is connected to the control device 6.
As will be described later, the controller 6 stores in advance values of the circumferences of the rollers 3a to 3d. For example, the circumference of a roller having a diameter of 100 cm is 314 cm, and the data is stored in the storage unit of the control device 6.

The control device 6 performs image processing on the image captured from the camera 5, detects a defect, and further obtains a period of a defect having periodicity.
When a foreign substance such as glue adheres to any of the rollers 3, a defect having a period substantially equal to the circumferential length of the roller 3 on which the foreign substance has adhered occurs on the web material 2. The roller 3 causing the defect is specified by comparing the circumference data of the roller 3 stored in advance.
The processing of the control device 6 will be described later.

The control device 6 is connected to the doctor control device 8 and the alarm device 9.
When detecting a periodic defect, the control device 6 sends an alarm output signal to the alarm device 9 to notify the alarm.
Moreover, if the control apparatus 6 detects a periodic defect, it will send the signal to that effect to the doctor control apparatus 8 with the information of the roller 3 (any of 3a-3d) identified as the cause of a defect.

The roller 3 is provided with a doctor 7.
The doctor 7 is a rectangle whose long side is substantially equal to the depth of the roll 3, and is a plate-like object made of resin or metal, for example. The surface of the roller 3 is cleaned by bringing the doctor 7 into contact with the surface of the roller 3. The doctor 7 has a drive unit that controls contact and separation with the roller 3 by a signal from the doctor control device 8.

Although FIG. 1 shows that the process proceeds to the next step via the roller 3e at the right end, the web material 2 may be wound around the roller 3e to obtain a final product.
Moreover, it is desirable that the camera 5 be installed so that the web material 2 conveyed between the two rollers 3 can be photographed. This is because the web material 2 transported between the rollers 3 is photographed and the defect is detected more visually than the web material 2 is photographed at the position on the roller 3 and the defect is detected. Because it is easy to do.

  Further, the doctor 7 may be installed on all the rollers 3 or may be installed only on the rollers 3 to which foreign matter is likely to adhere. If it is determined that the roller 3 without the doctor 7 is the cause of the defect, the worker may clean the roller 3.

  The doctor control device 8 is composed of, for example, a PLC (Programmable Logic Controller) or the like, receives the identification number of the roller 3 causing the defect from the control device 6, and is driven by the drive unit of the doctor 7 installed in the roller 3. Send a signal.

The alarm device 9 is, for example, a buzzer or an indicator lamp.
By displaying the identification number of the roller 3 causing the defect together with the alarm, it becomes possible to quickly identify the problematic roller 3.
If an alarm device 9 such as an indicator lamp is provided for each roller 3, the problematic roller 3 can be immediately identified in accordance with an alarm output signal from the control device 6.

FIG. 2 is a block diagram illustrating a hardware configuration example of the control device 6.
The control device 6 can be composed of a computer device such as a personal computer, for example.
In the control device 6, for example, a control unit 11, a storage unit 12, a media input / output unit 13, a communication control unit 14, an input unit 15, a display unit 16, a peripheral device I / F (interface) unit 17 and the like are connected by a bus 18. It is the structure which was made.

  The control unit 11 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like.

The CPU calls and executes a program stored in the ROM, the storage unit 12 and the like in a work memory area on the RAM, drives and controls each device connected via the bus 18, and realizes processing performed by the computer.
The ROM is a non-volatile memory and permanently holds a computer boot program, a program such as BIOS, data, and the like.
The RAM is a volatile memory, and temporarily holds a program, data, and the like loaded from the storage unit 12, ROM, storage medium, and the like, and includes a work area used by the control unit 11 for performing various processes.

The storage unit 12 stores a program executed by the control unit 11, data necessary for program execution, an OS (Operating System), and the like. The program is a processing program of the quality management system 1 according to the embodiment of the present invention.
The processing program will be described later.
The program code is read by the control unit 11 as necessary, transferred to the RAM, and executed by the CPU.
The data stored in the storage unit 12 is, for example, data on the circumference of the roller 3, and these data may be stored in the storage unit 12 in advance.

The media input / output unit 13 (drive device) inputs / outputs data, for example, media such as a CD drive (-ROM, -R, -RW, etc.), DVD drive (-ROM, -R, -RW, etc.) Has input / output devices.
The communication control unit 14 includes a communication control device, a communication port, and the like, and performs communication control with other devices via a network. The network may be wired or wireless.

The input unit 15 inputs data and includes, for example, a keyboard, a pointing device such as a mouse, and an input device such as a numeric keypad. For example, the operator of the quality management system 1 inputs data such as the circumference of the roller 3 from the input unit 15.
The display unit 16 is a display device such as a CRT monitor or a liquid crystal panel. The display unit 16 displays captured images of defect candidates, selection inputs for visual input, and the like.

The peripheral device I / F (interface) unit 17 is a port for connecting peripheral devices, and is configured by USB, IEEE1394, RS-232C, or the like, and the connection form may be wired or wireless. A captured image captured by the camera 5 is input to the control device 6 via the peripheral device I / F unit 17, stored in the storage unit 12, and processed.
The doctor control device 8 and the alarm device 9 are also connected to the control device 6 via the peripheral device I / F unit 17.
The bus 18 is a path that mediates transmission / reception of control signals, data signals, and the like between the devices.

FIG. 3 is a flowchart showing the flow of processing of the control device 6.
First, the control unit 11 of the control device 6 inputs the circumference of each roller 3 from the input unit 15 and registers it in the storage unit 12 (step 101).

FIG. 4 is a diagram illustrating a configuration example of the roller circumferential length storage table 31 stored in the storage unit 12.
As shown in FIG. 4, the roller circumferential length 312 is stored so as to correspond to the roller identification number 311. That is, for example, the peripheral length 312 of the roller having the roller identification number 311 of “1” is “R1”.
The roller circumference registration process in step 101 may be performed in advance.

Returning to FIG. 3, the control unit 11 then initializes the value of Flag, which is a flag indicating the presence or absence of a periodic defect, to 0 (step 102).
Next, the control unit 11 captures an image captured by the camera 5 (step 103).
When a line sensor camera is used as the camera 5, a rectangular image having a long side in the width direction of the web material 2 is obtained in time series and stored in the storage unit 12.

Based on the captured image data stored in the storage unit 12 at a predetermined time, the following defect detection and cycle calculation processing is performed.
At this time, for example, the predetermined time may be set so that the length of the captured image in the conveyance direction is equal to or longer than 2Rmax when the peripheral length of the roll 3 having the maximum peripheral length is Rmax. That is, the predetermined time may be set to 2 Rmax / T seconds or more when the transport speed is Tcm / second.

Next, the control unit 11 performs a process of detecting a defect from a captured image at a predetermined time (step 104).
In the defect detection process, first, in order to facilitate the extraction of a defective portion, as preprocessing, shading correction processing, filtering processing such as differentiation, contrast enhancement, and smoothing, and gradation processing are performed on the captured image.

Next, processing for extracting defects from the image after gradation processing is executed.
That is, a threshold value for the gradation of the image is provided, and a defective area is extracted by extracting a portion higher than the threshold value. Since the defect extraction processing is also performed in a conventional defect detection apparatus using image processing (for example, Japanese Patent Laid-Open No. 08-68764), detailed description thereof is omitted here.

If no defect is detected from the captured image in step 104 (“No” in step 104), the process returns to step 102.
When a defect is detected from the captured image in step 104 (“Yes” in step 104), the control unit 11 executes a process of calculating a defect cycle (step 105).

FIG. 5 is a diagram for explaining a defect 43 generated on the web material 2.
If the web material 2 is conveyed in the direction of the arrow B, a defect such as defects 43-1 to 4 may occur in the captured image 41 of the web material 2, for example.

  The defects 43-1 to 43-3 are defects periodically generated at the same position in the width direction of the web member 2. Such a defect occurs when a foreign substance such as glue adheres on the roller 3. Incidentally, such a defect often occurs at the end of the web material 2 in the width direction.

  On the other hand, the defect 43-4 is a defect that occurs once in the web material 2. Such a defect occurs, for example, when dust such as a metal piece adheres to the web material 2 and has no periodicity.

Next, returning to step 105 in FIG. 3, calculation of the defect cycle will be described.
FIG. 7 is a flowchart showing the flow of the cycle calculation process in step 105.
Here, it is assumed that there are I defects on the captured image 41 and the number of rollers 3 in the process of the quality control system 1 is J.

First, the controller 11 initializes the defect index i on the captured image 41 to 1 (step 201).
Next, the coordinates (Xi, Yi) of the i-th defect are obtained (step 202).
In the example of FIG. 5, first, the coordinates of the defect 43-1 are obtained.
Here, the coordinate Xi is the position of the web material 2 in the width direction, and the coordinate Yi is the position of the web material 2 in the transport direction.

Next, the control part 11 calculates | requires the coordinate (X2, Y2) of the next defect of the conveyance direction of the web material 2 in the picked-up image 41 (step 203).
In the example of FIG. 5, the next defect is the defect 43-4, and the coordinates of the defect 43-4 are obtained.

  Next, the difference between the X coordinates of the i-th defect and the next defect is obtained, and it is determined whether or not the absolute value is equal to or less than a predetermined threshold A (step 204). The threshold A is an allowable value of the deviation in the width direction in the periodic defect, and is predetermined and stored in the storage unit 12.

In the example of FIG. 5, the X coordinates of the defect 43-1 and the defect 43-4 are greatly different, and No in step 204, the process proceeds to step 205, and the X coordinate of all defects on the captured image 41 with the i-th defect. It is determined whether or not comparison has been performed.
As shown in the example of FIG. 5, when the defects 43-2 and 43-3 still exist in the conveyance direction of the web material 2, No in Step 205 and the process returns to Step 203.
If there is no new defect in the conveyance direction of the web material 2 (Yes in Step 205), it is determined that the i-th defect has no periodicity (Step 206), and the process proceeds to Step 217.

If step 205 is No, the process returns to step 203, and in the case of FIG. 5, the coordinates (X2, Y2) are obtained for the next defect 43-2. In step 204, the i-th defect 43- The X coordinate Xi of 1 and X2 are compared.
If the absolute value of the X coordinate difference is equal to or smaller than the threshold value A in step 204 (Yes in step 204), the process proceeds to step 210 because there is a possibility of a periodic defect.

Next, the control unit 11 obtains the absolute value ΔY of the difference between the Y coordinate Yi of the i-th defect and the Y coordinate Y2 of the defect that may be a periodic defect (step 210).
Next, the control unit 11 initializes the index j of the identification number of the roller 3 to 1 (step 211), and the circumferential length Rj of the jth roller 3 from the roller circumferential length storage table 31 stored in the storage unit 12. Is read (step 212).

  Here, if the difference between the conveyance direction distance ΔY between the two defects and the circumferential length Rj of the j-th roller is equal to or smaller than the threshold B (| ΔY−Rj | ≦ B) (Yes in Step 213), the 2 One defect has periodicity, the period is the circumference of the jth roller, the cause of the defect is identified as the jth roller 3, and the control unit 11 has the roller identification number j and periodicity. Is stored in the storage unit 12 (step 219), and the process proceeds to step 217.

  In the case of No in step 213, the controller 11 increments the index of the roller identification number j by 1 (step 214), and when the circumference comparison has not been completed for all the J rollers (No in step 215). Then, the process returns to step 212, and if completed (Yes in step 215), it is determined that the two defects are not periodic (step 216), and the process proceeds to step 217.

In step 217, the control unit 11 increments the index i indicating the defect number on the captured image 41 by 1 and if the calculation of the period for all I defects has not been completed (No in step 218), step 202. Returning to FIG. 5, the cycle calculation process (steps 202 to 218) is repeated.
On the other hand, when the calculation of the period for all the I defects is completed (Yes in Step 218), the control unit 11 ends the period calculation process (Step 105).

  When the period calculation process (step 105) is completed, if there is a periodic defect on the captured image 41 in the storage unit 12 and there is a periodic defect, there is a possibility of causing the defect. The roller identification number j of a certain roller 3 is stored.

Next, returning to step 106 in FIG. 3, the control unit 11 refers to the storage unit 12 and determines the presence or absence of a periodic defect on the captured image 41 (step 106).
When there is a periodic defect (“Yes” in step 106), the control unit 11 substitutes 1 for a flag Flag indicating the presence or absence of the periodic defect (step 107), and causes the alarm device 9 to output an alarm. (Step 108), and sends the doctor drive signal to the doctor control device 8 together with the roller identification number j of the roller 3 identified as the cause of the defect (step 109).

In step 108, the alarm device 9 outputs an alarm using a buzzer or an indicator lamp.
In step 109, the doctor control device 8 drives the doctor 7 installed on the roller 3 with the roller identification number j.

FIG. 6 is a diagram for explaining an example of a driving method of the doctor 7.
A doctor 7 is installed in parallel to the width direction of the roller 3, and the doctor 7 is in contact with the roller 3 by operating a doctor driving unit 71 such as an air cylinder, for example, and the foreign matter on the roller 3 is rotated by the rotation of the roller 3. Remove.

  When the doctor drive unit 71 is connected to the doctor control device 8 and receives a drive signal from the doctor control device 8, for example, the air cylinder is operated to bring the doctor 7 into contact with the roller 3 and receive a stop signal from the doctor control device 8. Then, the doctor 7 is detached from the roller 3.

  Returning to step 109 in FIG. 3, when the doctor 7 removes the foreign matter from the roller 3, the process returns to step 103, the next captured image is captured (step 103), defect detection (step 104), and cycle calculation. (Step 105) is performed, and if there is still a periodic defect (“Yes” in Step 106), Step 107 to Step 109 are repeated to output an alarm by the alarm device 9 and a foreign object by the doctor 7. Continue removal.

On the other hand, if it is determined in step 106 that there is no periodic defect (“No” in step 106), the process proceeds to step 110.
That is, if Flag indicating the presence or absence of a periodic defect is “1”, it is determined that the previous periodic defect has been removed, and the control unit 11 sends a signal for stopping the alarm of the alarm device 9 ( Step 111), a signal for stopping the driving of the doctor 7 of the roller 3 with the roller identification number j is sent to the doctor control device 8 (Step 112).
As a result, the roller 3 causing the periodic defect is cleaned, and the control unit 11 returns to step 102 and repeats the process for the next captured image 41 (steps 102 to 112).

  On the other hand, if the flag indicating the presence or absence of a periodic defect is “0” in step 110, it is determined that there is no periodic defect before and the detected defect is not periodic (“0” in step 110). ”), The process returns to step 103, and the process (step 103 to step 112) for the next captured image 41 is repeated.

  Through the processing of the control device 6 described above, a defect on the web material 2 is detected, and when the defect has periodicity, the roller 3 that causes the defect is specified and the doctor 7 is driven to detect the defect. It becomes possible to eliminate the cause of the.

FIG. 8 is a diagram illustrating a method of limiting the roller 3 that causes the defect by identifying the unevenness of the defect 43.
As shown in FIG. 8A, when the web material 2 to be conveyed is irradiated with illumination 4 and photographed with the camera 5, as shown in FIG. The color tone is different, and the unevenness of the defect 43 is determined based on the color tone difference.

As shown in FIG. 8B, in the case of the convex defect 43a, the color tone of the defective portion in the photographed image 41 becomes whitish, whereas in the case of the concave defect 43b, the color tone becomes blackish.
Therefore, by setting a threshold value for the color tone, it is determined whether the detected defect is convex or concave.

  In FIG. 8, if the defect is a convex defect, the roller 3 causing the defect is the roller 3g below the web material 2. If the defect is a concave defect, the roller 3 causing the defect is It can be seen that the roller 3 f is on the upper side of the web material 2.

When there are a plurality of rollers 3 in the process, in the cycle calculation process (step 105), the rollers 3 that may cause the defect can be limited, and the processes of steps 211 to 215 in FIG. It can be simplified.
Further, when the rollers 3 having the same circumference exist on the upper side and the lower side of the web material, the roller 3 that causes the defect is identified by identifying the unevenness even if the defect generation period is the same. It becomes possible.

As described above, the embodiment of the quality management system 1 of the present invention has been described. According to the quality management system 1 of the present invention, defects on the web material 2 due to foreign matters adhering to the roller 3 are detected and generated from the cycle. The source roller 3 can be specified.
Further, by driving the doctor 7 installed on the roller 3 as the defect generation source, it is possible to automatically and quickly remove the foreign matter adhering to the roller 3, and it is expected to improve the yield. it can.

  Further, when removing foreign matter on the roller 3 manually, it is necessary to stop the production line from the viewpoint of safety, and defects continue to occur until the stop. Accordingly, there is an advantage that the foreign matter on the roller 3 can be removed without stopping the production line, and the operating rate of the production line is not reduced.

  In addition, since the doctors 7 installed on the individual rollers 3 are individually driven only when a periodic defect occurs, the frequency of replacement due to wear of the doctors 7 can be reduced, and the operating rate of the production line can be reduced. It leads to improvement. In addition, it is possible to minimize the mixing of metal powder or the like generated when the doctor 7 is worn, and an improvement in yield can be expected.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

1 ... Quality control system 2 ... Web material 3 ... Roller 4 ... Illumination 5 ... Camera 6 ... Control device 7 ... Doctor 8 ... Doctor control device 9 ......... Alarm device

Claims (12)

A quality management system for managing the quality of a web material conveyed through a plurality of rollers,
Storage means for storing the circumference of the roller;
Photographing means for photographing the web material conveyed through the plurality of rollers;
Defect extraction means for extracting defects from the image photographed by the photographing means;
Wherein determining a difference in the length direction of the coordinates of the web material of the two defects extracted by the defect extracting means, to determine substantially equal to the circumferential length of the roller that the difference is stored in the storage means, wherein and that there is no periodicity when the difference is not substantially equal with any circumferential length of said plurality of rollers, the cause of the defect as the periodicity in the case substantially equal to the circumferential length of the difference is one of the rollers there is A period calculating means for identifying the roller that causes the defect, and a roller;
A quality control system comprising:   The quality control system according to claim 1, wherein the image is a photograph of a range of a length of at least twice the circumference of the roller having the maximum circumference in the web material.   The period calculation means obtains a difference in coordinates in the length direction of the web material of two defects whose defects are substantially the same in the width direction of the web material, and the difference becomes substantially equal to the circumference. The quality control system according to claim 1, wherein the roller is identified as a roller that causes the defect. Each of the plurality of rollers is provided with a doctor, and further comprises doctor driving means for driving the doctor of the roller identified as the cause of the defect by the period calculating means, and removing the cause of the defect,
Claim wherein the doctor drive means, the cause of the defect is removed, characterized by the Turkey to end the doctor driving a defect that occurs in substantially equal period between the circumferential length of the roller that causes the defect is eliminated The quality control system according to any one of claims 1 to 3.   5. The quality control according to claim 1, further comprising alarm means for outputting an alarm when the difference is substantially equal to the circumference of the roller stored in the storage means. system.   6. The quality control system according to claim 5, wherein the alarm means stops the output alarm when there is no defect that occurs at a period substantially equal to the circumference of the roller that causes the defect.   The defect extraction means determines the unevenness of the defect based on the color tone of the defect extracted from the image, and limits the roller that causes the defect. The quality control system described in Crab. A quality control method for managing the quality of a web material conveyed through a plurality of rollers,
A storage step for storing the circumference of the roller;
A photographing step of photographing the web material conveyed through the plurality of rollers;
A defect extraction step for extracting defects from the image photographed by the photographing step;
Wherein determining a difference in the length direction of the coordinates of the two defects extracted by the defect extracting step web material, to determine substantially equal to the circumferential length of the roller that the difference is stored in the storing step, wherein and that there is no periodicity when the difference is not substantially equal with any circumferential length of said plurality of rollers, the cause of the defect as the periodicity in the case substantially equal to the circumferential length of the difference is one of the rollers there is A period calculation step for identifying a roller that is a roller and causes the defect;
Each of the plurality of rollers is provided with a doctor, and the doctor driving step of driving the doctor of the roller identified as the cause of the defect by the period calculating step and removing the cause of the defect;
The quality control method characterized by comprising.   The period calculation step obtains a difference in coordinates in the length direction of the web material of two defects whose defects are substantially the same in the width direction of the web material, and the difference becomes substantially equal to the circumference. The quality control method according to claim 8, wherein the roller is identified as a roller that causes the defect.   The quality control method according to claim 8, further comprising an alarm step of outputting an alarm when the roller causing the defect is specified by the cycle calculating step.   11. The defect extraction step determines the unevenness of the defect based on the color tone of the defect extracted from the image, and limits the roller that causes the defect. The quality control method described in Crab. A program for causing a computer to function as a quality management system for managing the quality of a web material conveyed via a plurality of rollers,
The computer,
Storage means for storing the circumference of the roller;
Image input means for inputting a photographed image of the web material conveyed through the plurality of rollers;
Defect extraction means for extracting defects from the photographed image input by the image input means;
Wherein determining a difference in the length direction of the coordinates of the web material of the two defects extracted by the defect extracting means, to determine substantially equal to the circumferential length of the roller that the difference is stored in the storage means, wherein and that there is no periodicity when the difference is not substantially equal with any circumferential length of said plurality of rollers, the cause of the defect as the periodicity in the case substantially equal to the circumferential length of the difference is one of the rollers there is A period calculating means for specifying a roller that causes the defect,
Doctor driving means for driving the doctor provided on the roller causing the defect specified by the period calculating means, and removing the cause of the defect;
Program to function as.

Images