JP2009271027A - Non-defective product/defective product discrimination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallic foreign material detection device promptly discriminating a defective product in which metallic foreign material is mixed, and a non-defective product in which the metallic foreign material is not mixed. <P>SOLUTION: When a phase and amplitude of an induced voltage induced on a product to be detected are within a non-defective product area, it is determined that foreign material is not mixed in the product to be detected. When the phase and amplitude of the induced voltage induced on the product to be detected are not in the non-defective product area, it is determined that the foreign material is mixed. The detected products are thereby discriminated as the defective product with the foreign material mixed and as the non-defective product with no foreign material mixed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is a non-defective product / defective product judgment device capable of immediately discriminating a detected product such as clothing, fiber, carpet, and fabric into a defective product in which foreign matter is mixed and a good product in which foreign matter is not mixed. It is about.

  For example, when foreign objects such as metal are mixed in objects to be detected such as clothing, fibers, carpets, and fabrics, defective products such as clothing, fibers, carpets, and fabrics that contain the foreign materials are removed from the product. Need to be detected and excluded.

  Patent Document 1 discloses a foreign object detection device that detects a metal foreign object mixed in an object to be detected.

JP-A-11-118766

  4 to 8 are diagrams showing an outline of the foreign object detection device described in Patent Document 1. FIG. In the figure, reference numeral 103 denotes a transmission coil, and 201 denotes a reception coil. The detected object H is transported between the transmission coil 103 and the receiving coil 201 so that the metallic foreign matter mixed in the detected object H is magnetically detected. The transmission coil 103 is configured so that the electromagnetic wave I shown in FIG. FIG. 6 shows an induced voltage F induced in the detected object H when the detected object H is irradiated with the electromagnetic wave I.

  Here, the electromagnetic wave I is phase-modulated and amplitude-modulated by irradiating the detection object H, and the induced voltage F shown in FIG. 6 is phase-modulated and amplitude-modulated. When foreign matter is mixed in the detection object H, the form of the induced voltage F varies depending on the type of foreign matter.

  That is, for example, when iron is placed in a high frequency, the iron is directly magnetized and disturbs the high frequency alternating magnetic field. On the other hand, when the stainless steel is placed in a high frequency, the stainless steel is not easily magnetized, and a secondary magnetic field is generated by an eddy current generated inside the stainless steel to disturb the high frequency alternating magnetic field. Thus, the phase of the magnetic field generated secondarily is delayed by about 90 degrees compared to the case where the magnetic field is directly magnetized like the above-described iron. The amplitude of the magnetic field generated secondarily is also different from that of iron.

  That is, since the phase and amplitude of the induced voltage F to be induced differ depending on the type of foreign matter mixed in the object to be detected H, the object to be detected is based on the phase and amplitude of the induced voltage F. In this configuration, the type of foreign matter mixed in H is detected.

  Next, a synchronous detector 105 is provided downstream of the receiving coil 201 via a receiving amplifier 202, and the induced voltage F shown in FIG. 6 is input to the synchronous detector 105. As shown in FIG. 7, the induced voltage F is set in the synchronous detector 105 so as to be arranged on the orthogonal coordinates of the X axis and the Y axis with the phase angle φ inclined with respect to the X axis. The synchronous detector 105 is configured to decompose the induced voltage F into an X component and a Y component and output the result.

  As shown in FIG. 4, an XY phase detection arithmetic unit 108 is provided in the subsequent stage of the synchronous detector 105 through a signal filter 204 for removing noise, and the X component of the induced voltage F, and Y The components are input to the XY phase detection arithmetic unit 108. The XY phase detection arithmetic unit 108 is configured to obtain the Lissajous figure shown in FIG. 8 by combining the X component and the Y component of the induced voltage F. The Lissajous figure is a figure obtained by moving the base point P of the induced voltage F in FIG. 7 to the origin of orthogonal coordinates and removing the time element. In FIG. 8, each point P1, P22, P3,... Pn represents a vector of an induced voltage F obtained by combining the X component and the Y component.

  Since the Lissajous figure shown in FIG. 8 differs depending on the type of foreign matter mixed in the detected object H, the type of foreign matter mixed in the detected object H is detected by the form of the Lissajous figure. Is something that can be done.

  However, since the Lissajous figure differs depending on the type of metal, when trying to detect a metallic foreign object by the Lissajous waveform, a Lissajous figure for only the type of metal expected to be mixed in the product is obtained and prepared in advance. In addition, the Lissajous waveform of the metallic foreign substance actually detected must be compared with the Lissajous figure prepared in advance, but the type of metallic foreign substance expected to be mixed in the product In many cases, not only is it difficult to collate the Lissajous figure of the metallic foreign substance actually detected with the Lissajous figure prepared in advance, but it is not practical due to the complexity of the apparatus for that purpose. There was a problem.

  For this reason, for example, the invention described in Patent Document 1 is preferably used for the operation of immediately detecting and removing only defective products that are transported on a production line and mixed with foreign metal from a large amount of products. It was not a thing.

  For this reason, conventionally, there has been a demand for a non-defective product / defective product judgment device that can immediately detect only defective products mixed with metallic foreign substances from a large amount of products.

  The present invention has been made in view of the actual situation of the background art, and the purpose thereof is to immediately discriminate between a defective product in which metal foreign matters are mixed and a non-defective product in which metal foreign matters are not mixed. The object is to provide a non-defective / defective product judging device.

According to the first aspect of the present invention, the phase or amplitude of the induced voltage induced in the product to be detected is obtained by irradiating electromagnetic waves to the product to be detected such as clothing, fiber, carpet, fabric, etc. A non-defective product / defective product discriminating device capable of discriminating the product to be detected into a defective product in which foreign matter is mixed and a non-defective product in which foreign matter is not mixed based on the phase or amplitude of voltage,
A non-defective area storage means for storing a non-defective area identified by the phase or amplitude of the induced voltage induced in the non-defective sample by irradiating electromagnetic waves to the non-defective sample.
Determining means for determining whether the phase or amplitude of the induced voltage induced in the product to be detected is located in the non-defective area stored in the non-defective area storage means;
When the phase or amplitude of the induced voltage induced in the product to be detected is located in the non-defective product area, the determination unit determines that no foreign matter is mixed in the product to be detected, When the phase or amplitude of the induced voltage induced in the product to be detected is not located in the non-defective product area, it is determined that foreign matter is mixed in the product to be detected. It is a non-defective product / defective product judgment device characterized in that a product for use is discriminated as a defective product in which foreign matter is mixed and a non-defective product in which foreign matter is not mixed.

The invention according to claim 2 determines the phase and amplitude of the induced voltage induced in the product to be detected by irradiating electromagnetic waves to the product to be detected such as clothing, fiber, carpet, and fabric, Based on the phase and amplitude of the induced voltage, it is a non-defective product / defective product discriminating device capable of discriminating a product to be detected into a defective product in which a metal foreign object is mixed and a good product in which the metal foreign material is not mixed,
Non-defective area storage means for storing a non-defective area identified by the phase and amplitude of the induced voltage induced in the sample non-defective product by irradiating the sample non-defective product with electromagnetic waves,
A judgment means for judging whether the phase and the amplitude of the induced voltage induced in the product to be detected are located in a good product area stored in the good product area storage means;
When the phase and amplitude of the induced voltage induced in the product to be detected are located in the non-defective product area, the determination unit determines that no metal foreign matter is mixed in the product to be detected. If the phase and amplitude of the induced voltage induced in the detected product are not located in the non-defective product area, it is determined that a metal foreign matter is mixed in the detected product. The non-defective product / defective product judging device is characterized by discriminating the product to be detected into a defective product in which a metal foreign object is mixed and a non-defective product in which the metal foreign material is not mixed.

  According to the first aspect of the present invention, when the phase or amplitude of the induced voltage induced in the product to be detected such as clothing, fiber, carpet, or fabric is located in the non-defective area, the product to be detected. If the phase or amplitude of the induced voltage induced in the detected product is not within the non-defective product area, the detected product is contaminated with foreign matter. This makes it possible to immediately determine the product to be detected as a defective product in which foreign matter is mixed and a non-defective product in which foreign matter is not mixed.

  According to the second aspect of the present invention, when the phase and amplitude of the induced voltage induced in the product to be detected such as clothing, fiber, carpet, and fabric are located in the non-defective product area, the product to be detected. If the phase and amplitude of the induced voltage induced in the product to be detected is not within the non-defective product area, the product being detected contains foreign material. This makes it possible to immediately determine the product to be detected as a defective product in which foreign matter is mixed and a non-defective product in which foreign matter is not mixed.

  1 to 3 are diagrams showing an embodiment. FIG. 1 is an overall block diagram. 2 and 3 are diagrams for explaining the operation.

  The same components as those in the background art shown in FIG. The non-defective product / defective product judging device 1 includes a non-defective product area calculating means 2, a good product area storing means 3, and a judging means 4. Alternatively, the determination unit 4 is selected and input. The non-defective product / defective product judging device 1 can be constituted by a computer having a CPU and predetermined program software. Further, the present invention can be applied to clothing, fibers, carpets, fabrics, and the like as products to be detected. In addition, foreign substances mixed in the product to be detected are components different from the components of the product and various kinds are expected. In the following explanation, metal foreign objects are taken as an example. explain.

  As shown in FIG. 2, the input terminal of the non-defective area calculation means 2 is a product in which it is known in advance that no metallic foreign matter is mixed, that is, the data D of the Lissajous figure of the non-defective sample is in the form of polar coordinates. Is input.

Next, the function of the good area calculation means 2 will be described. First, as shown in FIG. 2, a product for which it is known in advance that no metallic foreign matter is mixed, that is, a sample good product is irradiated with electromagnetic waves and an induced voltage induced in the sample good product is obtained, as shown in FIG. Find the Lissajous figure. Each point of the Lissajous figure is specified by the distance r from the origin O to each point and the angle formed by the straight line A and the base line K connecting the origin O and each point. Next, the distance r from the origin O to all the points is obtained, the distance to the point M having the maximum distance r is R1, and the angle α formed by the straight line A connecting the point M and the origin O and the base line K is α. And Next, a distance R2 to a point B on the straight line B orthogonal to the straight line A, that is, a point on the straight line B that forms α + 90 with the base line K and the point N having the maximum distance from the origin O is obtained. In other words, the non-defective area calculation means 2 is a rectangle having a distance R1 in the direction of the angle α with respect to the base line K and a distance R2 in the direction of α + 90 degrees with respect to the base line K (in the figure, a dashed line) The area surrounded by () is determined as the non-defective area Q. From the state shown in FIG. 2, the non-defective product area Q is converted into orthogonal coordinates as shown in FIG. 3 by rotating the Lissajous figure of the sample good product clockwise by an angle α, as shown in FIG. It can also be stored in the area storage means 3.

  Next, the good area storage means 3 stores the good area Q specified by the good area calculation means 2. The non-defective area storage means 3 is constituted by a rewritable memory.

  Next, the determination means 4 determines that the point X specified by the phase and amplitude of the induced voltage induced in the detected product by actually irradiating the detected product with electromagnetic waves is the non-defective product area Q. It has a function of determining whether or not the product to be detected is a non-defective product by determining whether or not the product is located inside. That is, when the point X specified by the phase and amplitude of the induced voltage induced in the product to be detected is located in the non-defective product area Q, the determination unit 4 determines that the product to be detected is a good product. On the other hand, if the point X is not located in the non-defective product area Q, the detected product is determined as a defective product. In addition, as shown in FIG. 3, when the non-defective area Q stored in the non-defective area storage means 3 is stored in a state of being converted into orthogonal coordinates, the induced voltage induced in the product to be detected After rotating the coordinates of the point X specified by the phase and the amplitude in the clockwise direction by the angle α, the detected product is determined to be good depending on whether the coordinate of the point X is located in the good area Q or not. Or a defective product may be determined.

  And, when the metallic foreign matter is mixed in the product to be detected by the determination means 4, for example, a warning or warning that a metallic foreign matter is mixed in the product to be detected, Alternatively, the production line for the product to be detected can be stopped.

  As described above, in the present embodiment, the induced voltage induced in the sample non-defective product by irradiating the sample non-defective product with the electromagnetic wave is known in advance, that is, the product that is known to be free of metal foreign matters. The non-defective product area Q specified by the amplitude and phase is obtained in advance, while the detected product is irradiated with electromagnetic waves, so that the amplitude and phase of the induced voltage induced in the detected product are present in the non-defective product area Q. Even if the type of metallic foreign matter expected to be mixed in the product is unclear or there are many types of metallic foreign matter, It is possible to easily and immediately detect a defective product in which the product is mixed, and to reliably exclude the defective product from the product.

  In the above description, the phase and amplitude of the induced voltage induced in the product to be detected by irradiating electromagnetic waves to the product to be detected such as clothing, fiber, carpet, and fabric, and the induced voltage is obtained. The case where the product to be detected is determined to be a defective product in which a metal foreign object is mixed and a non-defective product in which the metal foreign material is not mixed is described based on the phase and amplitude of the A non-defective product or a defective product may be determined based on the phase or amplitude of the induced voltage. Here, when the phase is ignored, the non-defective product area has a circular shape specified only by the amplitude. In addition, the non-defective product area can be specified by setting the area using a pointing device such as a mouse by taking the induced voltage induced in the product to be detected into a personal computer.

FIG. 1 is a block diagram of the entire embodiment. FIG. 2 is a diagram for explaining the operation. FIG. 3 is a diagram for explaining the operation. FIG. 4 is a block diagram of a background art metallic foreign matter detection apparatus. FIG. 5 is a diagram showing an electromagnetic wave irradiated to the product to be detected. FIG. 6 is a diagram showing a state in which the electromagnetic wave shown in FIG. 5 is amplitude-modulated and phase-modulated in the product to be detected. FIG. 7 is a diagram showing the function of the synchronous detector. FIG. 8 is a Lissajous figure.

Explanation of symbols

1 non-defective product / defective product judging means 2 good product area calculating means 3 good product area storing means 4 judging means

Claims (2)

Obtain the phase or amplitude of the induced voltage induced in the product to be detected by irradiating electromagnetic waves to the product to be detected such as clothing, fiber, carpet, fabric, etc., and based on the phase or amplitude of the induced voltage, A non-defective product / defective product discriminating device capable of discriminating the detected product into a defective product mixed with foreign matter and a non-defective product containing no foreign matter,
A non-defective area storage means for storing a non-defective area identified by the phase or amplitude of the induced voltage induced in the non-defective sample by irradiating electromagnetic waves to the non-defective sample.
Determining means for determining whether the phase or amplitude of the induced voltage induced in the product to be detected is located in the non-defective area stored in the non-defective area storage means;
When the phase or amplitude of the induced voltage induced in the product to be detected is located in the non-defective product area, the determination unit determines that no foreign matter is mixed in the product to be detected, When the phase or amplitude of the induced voltage induced in the product to be detected is not located in the non-defective product area, it is determined that foreign matter is mixed in the product to be detected. Product / defective product judging device characterized by discriminating a product for use into a defective product in which foreign matter is mixed and a non-defective product in which foreign matter is not mixed. The phase and amplitude of the induced voltage induced in the product to be detected by irradiating electromagnetic waves to the product to be detected such as clothing, fiber, carpet, and fabric, and based on the phase and amplitude of the induced voltage The product to be detected is a non-defective product / defective product discriminating device capable of discriminating between a defective product in which a metal foreign object is mixed and a non-defective product in which the metal foreign material is not mixed,
Non-defective area storage means for storing a non-defective area identified by the phase and amplitude of the induced voltage induced in the sample non-defective product by irradiating the sample non-defective product with electromagnetic waves,
A judgment means for judging whether the phase and the amplitude of the induced voltage induced in the product to be detected are located in a good product area stored in the good product area storage means;
When the phase and amplitude of the induced voltage induced in the product to be detected are located in the non-defective product area, the determination unit determines that no metal foreign matter is mixed in the product to be detected. If the phase and amplitude of the induced voltage induced in the detected product are not located in the non-defective product area, it is determined that a metal foreign matter is mixed in the detected product. The non-defective product / defective product judging device characterized in that the product to be detected is discriminated between a defective product mixed with a metal foreign object and a non-defective product not mixed with the metal foreign object.

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