JP2010169643A - Apparatus for detecting foreign substance, textile machine using apparatus for detecting foreign substance, and method for detecting foreign substance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for detecting foreign substances, detecting the foreign substances of various colors easily, and also to provide a textile machine using the apparatus for detecting the foreign substances, and a method for detecting the foreign substances. <P>SOLUTION: The apparatus for detecting the foreign substances, which detects existence of the foreign substances currently mixed in a line of thread Y, is equipped with: a light source section 41 for irradiating lights D1 and D2 to the line of the thread Y; a first light receiving section 51 for receiving reflecting lights R1 and R2 from the line of the thread Y; and a detecting section 612 for detecting existence of the foreign substances based on intensity information of the reflecting lights R1 and R2 from the first receiving section 51. The light source section 41 is equipped with a first LED 411 and a second LED 412 being light sources of blue light. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a foreign matter detection device that detects the presence or absence of foreign matter mixed in a yarn, a textile machine using the foreign matter detection device, and a foreign matter detection method.

  In the manufacture of yarns such as spun yarns, foreign matter is mixed into the raw fiber, and this foreign matter may not be removed during the manufacturing process, and the foreign matter may remain even when it becomes a yarn. For example, in the case of cotton yarn (yarn formed from cotton fibers), fibers (raw cotton taken out from cotton trees) as raw materials contain trash (trash) of cotton stems and leaves as foreign matter. Although the trash is removed from the raw cotton by a process such as carding, a part of the trash remains. If foreign matter remains on the yarn, the quality of the yarn is deteriorated. Therefore, it is necessary to detect the presence or absence of foreign matter mixed in the yarn and to remove the portion containing foreign matter.

  Patent Document 1 discloses a technique for irradiating a yarn from a light source, measuring the intensity of reflected light, and determining the presence or absence of foreign matter mixed in the yarn based on the intensity information. Yes. This technology utilizes the fact that the light reflectance of the fiber that is the raw material and the light reflectance of the foreign material are different. For example, a foreign matter having a lower light reflectance than the fiber that is the raw material is mixed. In this case, since the intensity of the reflected light is reduced, it can be determined that foreign matter is mixed. Patent Document 1 discloses that, in particular, plant foreign substances in wool fibers have a reflectance lower than that of wool fibers in the blue light source color.

JP-A-61-292046

  However, there are not only foreign materials of different materials but also foreign materials that are the same in material and differ only in color from the raw material fibers. Patent Document 1 discloses a technique that uses a blue light source to detect plant foreign substances in wool fibers, but does not disclose techniques for detecting various color foreign substances.

  The present invention has been made to solve the above-described problems, and provides a foreign object detection device capable of easily detecting foreign objects of various colors, a textile machine using the foreign object detection device, and a foreign object detection method. Objective.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  In the case where foreign matter is detected by irradiating the yarn with light and measuring the intensity of the reflected light, the detection becomes easier as the difference between the light reflectance of the raw material fiber and the light reflectance of the foreign matter is larger. In other words, it is easy to detect foreign substances of various colors by irradiating many colors of foreign substances with light having a large difference between the light reflectance of the raw material fibers and the light reflectance of the foreign substances. . Therefore, light having a large difference between the light reflectance for the raw material fibers and the light reflectance for various foreign substances was examined.

  FIG. 1 shows a case where a light of various colors is irradiated to a reflector of various colors, the intensity of the reflected light is measured with respect to the intensity of the irradiated light, and the reflected light of the reflector is measured for each color of the irradiated light. It is the figure which showed intensity | strength. The irradiation light was four colors of yellow light, green light, red light, and blue light, and the color of the reflector was seven colors of white, black, red, green, yellow, light yellow, and blue. For example, illuminate light as yellow light, change the color of the reflector from white to blue, and measure sequentially, then illuminate as green light, red light, and blue light, and the color of the reflector as white to blue. Measured sequentially after changing to.

  Each numerical value in FIG. 1 is shown for each color of light that irradiates the ratio of the intensity of the reflected light of each color reflector, where the intensity of the reflected light with respect to the white reflector is 100. For example, when the light to be irradiated is yellow light and the intensity of the reflected light when the reflecting object is white is 100, the intensity of the reflected light when the reflecting object is black is 8. Similarly, numerical values of red, green, yellow, light yellow, and blue reflectors other than black are also shown in comparison with white reflectors. According to FIG. 1, when the light to irradiate is blue light, it turns out that the intensity | strength of the reflected light of the reflector of each color is comparatively low with respect to the intensity of the reflected light of a white reflector.

  FIG. 2 is a diagram showing the color of the reflecting object and the color of light suitable for detecting the reflecting object of that color based on the numerical values in FIG. Since the detection is easier as the difference between the light reflectance of the raw material fiber and the light reflectance of the foreign material is larger, the intensity of the reflected light is 20 or less (the intensity with the white color) with respect to the intensity of the white reflected light. Difference of 80 or more), the light of that color is very suitable for the detection of foreign matter of that color, a double circle, white reflection amount of 20 more than 30 or less (the difference in intensity from white is 70 or more) Less than 80), the light of the color is considered to be suitable for the detection of foreign matter of the color, and the white reflection amount is more than 30 and less than 50 (difference in intensity from white is less than 70 and less than 70) The color light is not suitable for the detection of a foreign object of that color, it is assumed to be a triangle, the white reflection amount exceeds 50 (difference in intensity from white is less than 50), and the light of that color detects the foreign object of that color. Shown as crossed as not suitable for.

  As shown in FIG. 2, yellow light is suitable for detecting black and blue foreign matters, but is not suitable for detecting red, green, yellow, and light yellow foreign matters except white. Similarly, green light is suitable for detecting black, red, and blue foreign matters, but is not suitable for detecting green, yellow, and light yellow foreign matters except white. Red light is suitable for detecting black and blue foreign matters, but is not suitable for detecting red, green, yellow and light yellow foreign matters except white. On the other hand, blue light is not suitable for detecting blue foreign matters, but is suitable for detecting black, red, green, yellow, and light yellow foreign matters except white.

  Therefore, blue light is a light that has a large difference between the light reflectance of the raw material fiber and the light reflectance of the foreign matter for many colors of foreign matter. When detecting the foreign matter by measuring the intensity of the light, it has been found that the use of blue light makes it easy to detect foreign matter of various colors.

  In addition, blue light is not suitable for detection of blue foreign matter, but light suitable for detection of blue foreign matter, for example, light of any color of yellow light, green light, and red light, is combined with blue light. By using it, it is possible to easily detect foreign substances of various colors including blue.

From the above, the foreign object detection device according to the first invention is
A foreign matter detection device for detecting the presence or absence of foreign matter mixed in a yarn,
A light source unit for irradiating the yarn with light;
A light receiving portion for receiving reflected light from the yarn,
Based on the intensity information of the reflected light from the light receiving unit, a detection unit for detecting the presence or absence of the foreign matter,
With
The light source section includes a first light source that is a blue light source.

In the first invention, the foreign object detection device according to the second invention is:
The light source unit further includes a second light source that is a light source of light other than blue light.

In a second invention, a foreign object detection device according to a third invention,
The first light source and the second light source irradiate light alternately on the yarn, thereby forming a foreign matter detection device.

The foreign object detection device according to a fourth aspect of the present invention is the second or third aspect of the invention,
The first light source and the second light source are arranged on the upstream side and the downstream side in the running direction of the yarn, and the foreign object detection device is provided.

A textile machine according to a fifth invention is
A textile machine comprising the foreign matter detection device according to any one of the first to fourth aspects of the invention is provided.

A foreign object detection method according to a sixth aspect of the invention includes:
A foreign matter detection method for detecting the presence or absence of foreign matter mixed in a yarn,
The foreign matter detection method is characterized in that the yarn is irradiated with blue light and the presence or absence of the foreign matter is determined based on the intensity of reflected light from the yarn.

A foreign object detection method according to a seventh invention is
A foreign matter detection method for detecting the presence or absence of foreign matter mixed in a yarn,
The foreign matter detection method is characterized in that the yarn is irradiated with blue light and light other than blue light, and the presence or absence of the foreign matter is determined based on the intensity of reflected light from the yarn.

The foreign object detection method according to the eighth invention is:
A foreign matter detection method for detecting the presence or absence of foreign matter mixed in a yarn,
The foreign matter detection method is characterized in that the yarn is alternately irradiated with blue light and light other than blue light, and the presence or absence of the foreign matter is determined based on the intensity of reflected light from the yarn.

A foreign matter detection method according to a ninth aspect of the invention includes:
A foreign matter detection method for detecting the presence or absence of foreign matter mixed in a yarn,
The yarn is irradiated with blue light and light other than blue light on the upstream side and the downstream side in the running direction of the yarn, and the presence or absence of the foreign matter is determined based on the intensity of the reflected light from the yarn. This is a foreign matter detection method characterized by this.

  As effects of the present invention, the following effects can be obtained.

  According to the first, fifth, and sixth inventions, the blue light is a light having a low reflectance with respect to foreign substances of many colors. Therefore, the detection of various kinds of foreign substances can be performed by using the blue light. It can be done easily. In particular, foreign substances of various colors mixed in white yarn can be efficiently detected.

  According to the second and seventh inventions, since blue light is light having a low reflectivity with respect to foreign substances of many colors other than blue, foreign substances of various colors other than blue can be obtained by using blue light. The blue foreign matter can be easily detected by using light other than blue light for the blue foreign matter. Therefore, it is possible to easily detect foreign substances of various colors including blue.

  According to the third and eighth inventions, the light from the first light source and the second light source is alternately irradiated onto the running yarn on the yarn, so that the light from the first light source and the second light source is irradiated. Reflected light is not mixed, and foreign substances of various colors including blue can be detected easily and reliably.

  According to the fourth and ninth inventions, the first light source and the second light source are arranged on the upstream side and the downstream side in the running direction of the yarn, thereby reflecting light from the first light source and the second light source. It is possible to easily and surely detect foreign substances of various colors including blue without mixing light.

The figure which shows the intensity | strength of the reflected light of a reflector for every color of the irradiated light. The figure which shows the color of a reflective body, and the color of the light suitable for detecting the reflective body of the color. 1 is a simplified diagram of a pneumatic spinning machine 1 as a textile machine. The simplified view which shows the section of foreign object detection device 31 concerning a 1st embodiment cut in the direction which intersects perpendicularly with running yarn Y. The figure which shows the flow of the operation | movement in which the foreign material detection apparatus 31 which concerns on 1st Embodiment detects the foreign material of the yarn Y. FIG. The simplified view which shows the section of foreign object detection device 31 concerning a 2nd embodiment cut in the direction which intersects perpendicularly with running yarn Y. The figure which shows the flow of the operation | movement in which the foreign material detection apparatus 31 which concerns on 2nd Embodiment detects the foreign material of the yarn Y. The perspective schematic diagram of the foreign material detection apparatus 31 which concerns on 3rd Embodiment. FIG. 9 is a simplified diagram showing a cross section of a casing 32a at line 9-9 in FIG. 8; FIG. 10 is a simplified diagram showing a cross section of a casing 32b at line 10-10 in FIG. 8; The figure which shows the flow of the operation | movement in which the foreign material detection apparatus 31 which concerns on 3rd Embodiment detects the foreign material of the yarn Y.

  A foreign object detection device 31 according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a simplified diagram of the pneumatic spinning machine 1 as a textile machine to which the foreign object detection device 31 is applied. The pneumatic spinning machine 1 is an apparatus for producing a cotton fiber spun yarn (hereinafter referred to as yarn Y) from a cotton fiber sliver S. The pneumatic spinning machine 1 includes a can 21 (sliver container), a drafting device 22, a spinning device 23, a yarn feeding device 24, and foreign matter detection in order from the upstream along the travel path in which the yarn Y is manufactured from the sliver S. A yarn defect detecting device 25 having a device 31, a winding device 26 and the like are arranged.

  Kens 21 contains a sliver S generated by a drawing machine. The draft device 22 includes a plurality of draft roller pairs that sandwich and extend the sliver S from the cans 21. The plurality of draft roller pairs are, for example, a back roller pair 221, a third roller pair 222, a second roller pair 223, and a front roller pair 224, and are arranged in this order along the traveling direction of the sliver S.

  The spinning device 23 produces the yarn Y by causing the swirl flow to act on the fiber bundle of the sliver S in an air spinning nozzle (not shown). The spinning speed of the pneumatic spinning machine 1 is, for example, 300 to 400 m / min, and high-speed spinning that is approximately 20 times the spinning speed of the ring spinning machine (20 to 30 m / min) is possible.

  The yarn feeding device 24 is a device that feeds the yarn Y manufactured by the spinning device 23 to the winding device 26, and includes a delivery roller 241 and a nip roller 242 that nip and feed the yarn Y.

  The yarn defect detection device 25 is a device that detects a yarn defect of the yarn Y being sent to the winding device 26. Based on the yarn defect information by the yarn defect detection device 25, the portion having the yarn defect is removed, and the defective yarn Y is prevented from being wound around the package P. The yarn defect detection device 25 also includes a cutting device (not shown) that cuts the yarn Y based on the yarn defect information and a yarn splicing device (not shown) that joins the yarn Y once cut.

  The winding device 26 is a device that forms the package P by traversing and winding the yarn Y manufactured by the spinning device 23 in the axial direction of the bobbin.

  The above is a schematic description of the pneumatic spinning machine 1, and then the yarn defect detecting device 25 will be described in detail. The yarn defect detection device 25 includes the foreign matter detection device 31 according to the first embodiment of the present invention, and the foreign matter detection device 31 detects the presence or absence of foreign matter mixed in the yarn Y. The yarn defect detection device 25 also includes a thickness abnormality detection device that detects an abnormality in the thickness of the yarn Y. However, in the following description, the description of the thickness abnormality detection device is omitted, and only the foreign matter detection device 31 is used. explain in detail.

  The foreign matter detection device 31 detects foreign matters such as fibers and resin pieces of various colors having different colors from normal cotton fibers (for example, white) among the matters mixed in the yarn Y. Since the foreign matter different in color from normal cotton fiber has different light reflectance, the foreign matter detection device 31 mixes in the yarn Y by utilizing the change in the intensity of the reflected light that changes due to the difference in reflectance. It is possible to detect a foreign object.

  FIG. 4 is a simplified diagram showing a cross section of the foreign object detection device 31 cut in a direction orthogonal to the traveling yarn Y. The foreign object detection device 31 includes a casing 32, a light source unit 41, a first light receiving unit 51, and a clearer controller 61. The light source unit 41 irradiates the yarn Y with the lights D1 and D2, the first light receiving unit 51 receives the reflected lights R1 and R2 from the yarn Y, and the clearer controller 61 reflects the reflected light from the first light receiving unit 51. The presence / absence of a foreign substance is detected based on the intensity information of R1 and R2.

  The casing 32 accommodates the light source unit 41 and the first light receiving unit 51 and allows the yarn Y to be inserted therein. An opening 321 is formed on the side of the casing 32, and an insertion passage 322 through which the yarn Y is inserted is formed inside the opening 321. The yarn Y is arranged by being guided from the opening 321 of the casing 32 to the back of the insertion path 322, and travels in the direction perpendicular to the paper surface of FIG.

  Inside the casing 32, a light source unit 41 that irradiates the yarn Y with the lights D 1 and D 2, a reflected light R 1 that is reflected by the yarn Y, and a reflected light R 2 that is reflected by the yarn Y is reflected by the light D 2. A first light receiving unit 51 that receives light and outputs intensity information of the reflected lights R1 and R2 is accommodated. The light source unit 41 includes a first LED (Light Emitting Diode) 411 as the first light source 42, a second LED 412, and a light source control unit 611 that controls lighting of the first light source 42. The first LED 411 and the second LED 412 are blue LEDs. The light source control unit 611 is provided in the clearer controller 61, and includes a time division circuit that switches the first LED 411 and the second LED 412 at high speed to alternately irradiate the blue lights D1 and D2. The first light receiving unit 51 includes a first light receiving element 511 and a second light receiving element 512. The first light receiving element 511 receives the reflected light R1, and the second light receiving element 512 receives the reflected light R2.

  In the casing 32, an optical path for guiding the light D1 and D2 irradiated from the light source 41 to the yarn Y and an optical path for introducing the reflected lights R1 and R2 from the yarn Y are formed. In the first optical path 331, the first LED 411 that irradiates the yarn Y with the light D1 is disposed, and in the third optical path 333, the second LED 412 that irradiates the yarn Y with the light D2 is disposed. The first optical path 331 and the third optical path 333 are formed so that the yarns Y can be irradiated with blue light D1 and D2 from different directions. For this reason, even when the foreign matter is mixed in the position where the yarn Y is biased, it can be reliably detected.

  The second optical path 332 is formed at a position where the reflected light R1 of the light D1 from the first optical path 331 is introduced, and the first light receiving element 511 is disposed. The fourth optical path 334 is formed at a position where the reflected light R2 of the light D2 from the third optical path 333 is introduced, and the second light receiving element 512 is disposed. The communication portion between the first optical path 331 and the insertion passage 322 and the communication portion between the second optical path 332 and the insertion passage 322 are partitioned by a first transparent plate 351 that transmits the light D1 and the reflected light R1. In addition, the entry of dust into the first optical path 331 and the second optical path 332 is prevented, and the dust is prevented from adhering to the first LED 411 and the first light receiving element 511. The communication portion between the third optical path 333 and the insertion passage 322 and the communication portion between the fourth optical path 334 and the insertion passage 322 are partitioned by a second transparent plate 352 that transmits the light D2 and the reflected light R2. In addition, the entry of dust into the third optical path 333 and the fourth optical path 334 is prevented, and the dust is prevented from adhering to the second LED 412 and the second light receiving element 512.

  The detection unit 612 receives the intensity information of the reflected lights R1 and R2 from the first light receiving unit 51, and detects the presence or absence of a foreign substance based on the intensity information, and is provided in the clearer controller 61. In the detection unit 612, a criterion (threshold value) is set for determining whether or not the portion where the intensity of the reflected light R1 or R2 varies is a portion where foreign matter is mixed. The threshold value is the lower limit intensity of the intensity of the reflected light R1, R2 (for example, −10% with respect to the intensity of the reflected light of the normal part), the lower limit intensity of the intensity of the reflected light R1, R2, and the length that the state continues. (For example, -10% with respect to the intensity of the reflected light of the normal part, and the length of the continuous state is 20 mm or more), and the part that exceeds this threshold is the part where foreign matter is mixed Judge.

  Next, the flow of the operation in which the foreign matter detection device 31 detects foreign matter on the yarn Y will be described with reference to FIG.

  When the first LED 411 and the second LED 412 as the first light source 42 are alternately irradiated with the blue lights D1 and D2 while being switched at high speed by the light source controller 611 (step S11), the light D1 is reflected by the yarn Y and reflected. The light R1 is received by the first light receiving element 511, the light D2 is reflected by the yarn Y, and the reflected light R2 is received by the second light receiving element 512 (step S12). The intensity information of the reflected lights R1 and R2 received by the first light receiving element 511 and the second light receiving element 512 changes according to the foreign matter mixed in the yarn Y, and the detection unit 612 includes the first light receiving element. The intensity information of the reflected light R1 from 511 and the intensity information of the reflected light R2 from the second light receiving element 512 are input.

  The detection unit 612 compares the input intensity information with a preset threshold value (step S13). If the intensity drop of the reflected light R1 or R2 exceeds the threshold value, foreign matter is mixed into the yarn Y. If the decrease in intensity of the reflected light R1 and R2 does not exceed the threshold value, the detection of the foreign matter on the yarn Y is continued.

  According to the first embodiment of the present invention described above, blue LEDs are used for the first LED 411 and the second LED 412 as the first light source 42, and blue light is used for foreign substances of many colors. Since the difference between the light reflectance of the raw material fiber and the light reflectance of the foreign matter is light, the color of the foreign matter mixed in normal cotton fiber (for example, white) is various colors (for example, black, Even in the case of red, green, yellow, and light yellow), the intensity information of the reflected light is likely to change at the portion where the foreign matter is mixed, and foreign matters of various colors can be easily detected. In particular, foreign substances of various colors mixed in the white yarn Y can be detected efficiently.

  Next, a foreign object detection device 31 according to a second embodiment of the present invention will be described. The foreign object detection device 31 according to the second embodiment is provided with a second light source 43 that is a light source other than blue light in addition to the first light source 42 that is a blue light source. The form is very different. Detailed description of the same parts is omitted.

  FIG. 6 is a simplified diagram showing a cross section of the foreign object detection device 31 cut in a direction perpendicular to the traveling yarn Y. FIG. The foreign object detection device 31 includes a casing 32, a light source unit 41, a first light receiving unit 51, and a clearer controller 61. The light source unit 41 irradiates the yarn Y with light D1, D2, D3, and D4, the first light receiving unit 51 receives the reflected light R1, R2, R3, and R4 from the yarn Y, and the clearer controller 61 The presence / absence of a foreign object is detected based on the intensity information of the reflected light R1, R2, R3, and R4 from the one light receiving unit 51.

  Inside the casing 32, the light source 41 that irradiates the yarn Y with the light D1, D2, D3, and D4, the reflected light R1 that the light D1 is reflected by the yarn Y, and the reflected that the light D2 is reflected by the yarn Y The light R2 and the light D3 are received by the reflected light R3 reflected by the yarn Y, and the light D4 is received by the reflected light R4 reflected by the yarn Y, and the intensity information of the reflected light R1, R2, R3, R4 is output. One light receiving portion 51 is accommodated.

  The light source unit 41 controls the irradiation of the first LED 411 and the second LED 412 as the first light source 42, the third LED 413 and the fourth LED 414 as the second light source 43, and the first light source 42 and the second light source 43. With. The first LED 411 and the second LED 412 are blue LEDs, and the third LED 413 and the fourth LED 414 are yellow LEDs. The first LED 411 that is a blue LED and the third LED 413 that is a yellow LED are disposed in the first optical path 331 of the casing 32, and the second LED 412 that is a blue LED and the fourth LED 414 that is a yellow LED are the third optical path 333 of the casing 32. Placed in.

  The first light receiving unit 51 includes a first light receiving element 511 and a second light receiving element 512. The first light receiving element 511 is disposed in the second optical path 332 into which the reflected lights R1 and R3 are introduced, and the reflected light. R1 and R3 are received. The second light receiving element 512 is disposed in the fourth optical path 334 through which the reflected lights R2 and R4 are introduced, and receives the reflected lights R2 and R4.

  The light source control unit 611 is provided in the clearer controller 61, and a time division circuit that switches the first LED 411, the second LED 412, the third LED 413, and the fourth LED 414 at high speed and alternately irradiates the light D1, D2, D3, and D4. Prepare. The order of irradiating the light D1, D2, D3, and D4 may be as long as blue light and yellow light are separately applied to the yarn Y at short intervals, for example, light D1 → light D2 → light D3 → As the light D4 → light D1..., The blue lights D1 and D2 are sequentially irradiated from different directions, and then the yellow lights D3 and D4 are sequentially irradiated from different directions. Further, as light D1 → light D3 → light D2 → light D4 → light D1..., The blue light D1 and the yellow light D3 are sequentially irradiated from the same direction, followed by the blue light D2 and the yellow light. D4 may be irradiated in order from a direction different from the previous direction. As described above, the blue light D1, D2 and the yellow light are alternately emitted by switching the first LED 411, the second LED 412, the third LED 413, and the fourth LED 414 to alternately emit the blue light D1, D2 and the yellow light D3, D4. It is possible to prevent D3 and D4 from being mixed.

  The detection unit 612 receives intensity information of the reflected light R1, R2, R3, and R4 from the first light receiving unit 51 and detects the presence or absence of a foreign substance based on the intensity information. The detection unit 612 is provided in the clearer controller 61. It has been. The detection unit 612 has a criterion (threshold) for determining whether a portion where the intensity of the reflected light R1, R2, R3, R4 has changed is a portion in which foreign matter is mixed, and the blue reflected light R1, R2 and yellow Is set for each of the reflected lights R3 and R4. The threshold value is the lower limit intensity of each of the blue reflected light R1, R2 and the yellow reflected light R3, R4 (for example, −10% with respect to the intensity of the reflected light of the normal part), or the blue reflected light R1, R2. And the lower limit intensity of each of the yellow reflected lights R3 and R4 and the length that the state continues (for example, −10% with respect to the intensity of the reflected light in the normal part, the length that the state continues is 20 mm or more) It can be set, and the part where any one of the reflected lights R1, R2, R3, and R4 exceeds this threshold is determined to be a part mixed with foreign matter.

  Next, the flow of the operation of detecting the foreign matter on the yarn Y by the foreign matter detection device 31 will be described with reference to FIG.

  While the first LED 411 and the second LED 412 as the first light source 42 and the third LED 413 and the fourth LED 414 as the second light source 43 are switched at high speed by the light source control unit 611, the blue light D1 and D2 and the yellow light D3 and D4 are switched. (Step S21), the lights D1 and D3 are reflected by the yarn Y, the reflected lights R1 and R3 are received by the first light receiving element 511, and the lights D2 and D3 are reflected by the yarn Y. Then, the reflected lights R2 and R4 are received by the second light receiving element 512 (step S22). The intensity information of the reflected light R1, R2, R3, R4 received by the first light receiving element 511 and the second light receiving element 512 changes according to the color of the foreign matter mixed in the yarn Y, and the detection unit 612 The intensity information of the reflected lights R1 and R3 from the first light receiving element 511 and the intensity information of the reflected lights R2 and R4 from the second light receiving element 512 are input.

  The detection unit 612 compares the intensity information input for the blue reflected lights R1 and R2 with a preset threshold value of the blue reflected light, and the intensity input for the yellow reflected lights R3 and R4. The information is compared with a preset threshold value of the yellow reflected light (step S23), and the intensity reduction of any of the blue reflected light R1, R2 or the yellow reflected light R3, R4 exceeds the threshold value. If it is, it is determined that foreign matter is mixed in the yarn Y (steps S24 and S25). If any decrease in intensity of the blue reflected lights R1 and R2 and the yellow reflected lights R3 and R4 does not exceed the threshold, the detection of the foreign matter on the yarn Y is continued.

  According to the second embodiment of the present invention described above, blue LEDs are used for the first LED 411 and the second LED 412 as the first light source 42, and the third LED 413 and the fourth LED 414 as the second light source 43 are used. A yellow LED is used. Blue light is light that has a large difference between the light reflectance of the fiber that is the raw material and the light reflectance of the foreign material with respect to foreign materials of many colors other than blue, but the blue foreign material is a raw material. The difference between the light reflectance of the fiber and the light reflectance of the foreign matter is not large. Therefore, detection of blue foreign matter is facilitated by using yellow light, which is light with a large difference between the light reflectance of the raw material fiber and the light reflectance of the foreign matter, for the blue foreign matter. For this reason, even if the color of foreign matters mixed in normal cotton fibers (for example, white) is various colors including blue (for example, black, red, green, yellow, light yellow, blue), the foreign matters are not The intensity information of the reflected light is likely to change in the mixed part, and foreign substances of various colors including blue can be easily detected. In particular, foreign substances of various colors mixed in the white yarn Y can be detected efficiently.

  Also, the blue light D1 and D2 from the first light source 42 and the yellow light D3 and D4 from the second light source 43 are alternately radiated onto the running yarn Y so that the blue light It is possible to prevent D1 and D2 from being mixed with yellow light D3 and D4. For this reason, the blue reflected lights R1 and R2 and the yellow reflected lights R3 and R4 are not mixed, and foreign substances of various colors including blue can be detected easily and reliably.

  Further, since the blue light D1 and D2 and the yellow light D3 and D4 can be prevented from being mixed, the first light source 42 and the second light source 43 can be arranged close to each other, and the foreign object detection device 31 can be reduced in size. Can be

  Next, a foreign object detection device 31 according to a third embodiment of the present invention will be described. The foreign object detection device 31 according to the third embodiment is characterized in that the first light source 42 and the second light source 43 are arranged on the upstream side and the downstream side along the traveling direction of the yarn Y. This is very different from the embodiment. Detailed description of the same parts is omitted.

  FIG. 8 is a simplified perspective view of the foreign object detection device 31, and the yarn Y travels from the upper side to the lower side of the paper surface of FIG. 8. 9 is a simplified diagram showing a cross section of the casing 32a along the line 9-9 in FIG. 8, and FIG. 10 is a simplified diagram showing a cross section of the casing 32b along the line 10-10 in FIG. The foreign object detection device 31 includes an upstream casing 32a and a downstream casing 32b along the traveling direction of the yarn Y, and the first light source 42 and the first light receiving unit 51 are accommodated in the casing 32a. The second light source 43 and the second light receiving part 52 are accommodated in the casing 32b. A common clearer controller 61 is also provided.

  As shown in FIG. 9, in the casing 32 a, the first LED 411 and the second LED 412 as the first light source 42 irradiating the yarn Y with the light D <b> 1 and D <b> 2, and the reflected light from which the light D <b> 1 is reflected by the yarn Y. A first light receiving unit 51 that receives the reflected light R2 reflected by the yarn Y from R1 and the light D2 and outputs the intensity information of the reflected light R1 and R2 is housed. The first LED 411 and the second LED 412 are blue LEDs. A light source control unit 611 that controls lighting of the first light source 42 is provided in a clearer controller 61 that is shared with the light source control unit 613. The light source control unit 611 includes a time division circuit that switches the first LED 411 and the second LED 412 at high speed to alternately irradiate the lights D1 and D2. The first light receiving unit 51 includes a first light receiving element 511 and a second light receiving element 512. The first light receiving element 511 receives the reflected light R1, and the second light receiving element 512 receives the reflected light R2.

  Further, inside the casing 32a, an optical path for guiding the light D1, D2 irradiated from the first light source 42 to the yarn Y and an optical path for introducing the reflected light R1, R2 from the yarn Y are formed. In the first optical path 331, the first LED 411 that irradiates the yarn Y with the light D1 is disposed, and in the third optical path 333, the second LED 412 that irradiates the yarn Y with the light D2 is disposed. The 1st optical path 331 and the 3rd optical path 333 are formed so that light D1 and D2 can be irradiated to yarn Y from a different direction. For this reason, even when the foreign matter is mixed in the position where the yarn Y is biased, it can be reliably detected.

  The second optical path 332 is formed at a position where the reflected light R1 of the light D1 from the first optical path 331 is introduced, and the first light receiving element 511 is disposed. The fourth optical path 334 is formed at a position where the reflected light R2 of the light D2 from the third optical path 333 is introduced, and the second light receiving element 512 is disposed. The communication portion between the first optical path 331 and the insertion passage 322 and the communication portion between the second optical path 332 and the insertion passage 322 are partitioned by a first transparent plate 351 that transmits the light D1 and the reflected light R1. The communication part between the third optical path 333 and the insertion path 322 and the communication part between the fourth optical path 334 and the insertion path 322 are partitioned by a second transparent plate 352 that transmits the light D2 and the reflected light R2.

  The detection unit 612 receives the intensity information of the reflected lights R1 and R2 from the first light receiving unit 51, and detects the presence or absence of a foreign substance based on the intensity information. The clearer controller 61 common to the detection unit 614 is used as the detection unit 612. Is provided. In the detection unit 612, a criterion (threshold value) is set for determining whether or not the portion where the intensity of the reflected light R1 or R2 varies is a portion where foreign matter is mixed. The threshold value is the lower limit intensity of the intensity of the reflected light R1, R2 (for example, −10% with respect to the intensity of the reflected light of the normal part), the lower limit intensity of the intensity of the reflected light R1, R2, and the length that the state continues. (For example, -10% with respect to the intensity of the reflected light of the normal part, and the length of the continuous state is 20 mm or more), and the part that exceeds this threshold is the part where foreign matter is mixed Judge.

  On the other hand, as shown in FIG. 10, in the casing 32 b, the third LED 413 and the fourth LED 414 as the second light source 43 that irradiates the yarn Y with the light D <b> 3 and D <b> 4, and the light D <b> 3 is reflected by the yarn Y. A second light receiving unit 52 that receives the reflected light R3 and the reflected light R4 reflected by the yarn Y and outputs the intensity information of the reflected lights R3 and R4 is accommodated. The third LED 413 and the fourth LED 414 are yellow LEDs. A light source control unit 613 that controls lighting of the second light source 43 is provided in a clearer controller 61 that is shared with the light source control unit 611. The light source control unit 613 includes a time division circuit that switches the third LED 413 and the fourth LED 414 at high speed to alternately irradiate the light D3 and D4. The second light receiving unit 52 includes a third light receiving element 513 and a fourth light receiving element 514. The third light receiving element 513 receives the reflected light R3, and the fourth light receiving element 514 receives the reflected light R4.

  Further, inside the casing 32b, an optical path for guiding the light D3 and D4 irradiated to the yarn Y from the second light source 43 and an optical path for introducing the reflected lights R3 and R4 from the yarn Y are formed. In the fifth optical path 335, a third LED 413 for irradiating the yarn Y with the light D3 is arranged, and in the seventh optical path 337, a fourth LED 414 for irradiating the yarn Y with the light D4 is arranged. The fifth optical path 335 and the seventh optical path 337 are formed so that the yarns D can be irradiated with the light D3 and D4 from different directions. For this reason, even when the foreign matter is mixed in the position where the yarn Y is biased, it can be reliably detected.

  The sixth optical path 336 is formed at a position where the reflected light R3 of the light D3 from the fifth optical path 335 is introduced, and the third light receiving element 513 is disposed. The eighth optical path 338 is formed at a position where the reflected light R4 of the light D4 from the seventh optical path 337 is introduced, and the fourth light receiving element 514 is disposed. The communication portion between the fifth optical path 335 and the insertion passage 324 and the communication portion between the sixth optical path 336 and the insertion passage 324 are partitioned by a third transparent plate 353 that transmits the light D3 and the reflected light R3. The communication part between the seventh optical path 337 and the insertion path 324 and the communication part between the eighth optical path 338 and the insertion path 324 are partitioned by a fourth transparent plate 354 that transmits the light D4 and the reflected light R4.

  The detection unit 614 receives the intensity information of the reflected lights R3 and R4 from the second light receiving unit 52, and detects the presence or absence of a foreign substance based on the intensity information. The clearer controller 61 that is common to the detection unit 612 is used as the detection unit 614. Is provided. In the detection unit 614, a criterion (threshold value) is set for determining whether or not the site where the intensity of the reflected light R3 and R4 varies is a site where foreign matter is mixed. The threshold value is the lower limit intensity of the intensity of the reflected light R3, R4 (for example, −10% with respect to the intensity of the reflected light of the normal part), the lower limit intensity of the intensity of the reflected light R3, R4, and the length that the state continues. (For example, -10% with respect to the intensity of the reflected light of the normal part, and the length of the continuous state is 20 mm or more), and the part that exceeds this threshold is the part where foreign matter is mixed Judge.

  Next, the flow of the operation in which the foreign matter detection device 31 detects foreign matter on the yarn Y will be described with reference to FIG.

  On the upstream side of the yarn Y, the first LED 411 and the second LED 412 as the first light source 42 are switched at high speed by the light source control unit 611, and the blue light D1 and D2 are alternately irradiated to the yarn Y, and the downstream side thereof. When the yellow light D3 and D4 are alternately applied to the yarn Y while the third LED 413 and the fourth LED 414 as the second light source 43 are switched at high speed by the light source control unit 613 (step S31), the lights D1 and D2 are emitted. Reflected by the yarn Y, the reflected lights R1 and R2 are received by the first light receiving element 511 and the second light receiving element 512 of the first light receiving unit 51, and the lights D3 and D4 are reflected by the yarn Y. The reflected light R3 and R4 are received by the third light receiving element 513 and the fourth light receiving element 514 of the second light receiving unit 52 (step S32).

  The intensity information of the reflected lights R1 and R2 received by the first light receiving element 511 and the second light receiving element 512 changes according to the color of the foreign matter mixed in the yarn Y, and the detection unit 612 receives the first light receiving light. The intensity information of the reflected light R1 from the element 511 and the intensity information of the reflected light R2 from the second light receiving element 512 are input. Further, the intensity information of the reflected lights R3 and R4 received by the third light receiving element 513 and the fourth light receiving element 514 changes according to the color of the foreign matter mixed in the yarn Y, and the detection unit 614 includes The intensity information of the reflected light R3 from the third light receiving element 513 and the intensity information of the reflected light R4 from the fourth light receiving element 514 are input.

  The detection unit 612 compares the intensity information input for the blue reflected light R1 and R2 with a preset threshold value of the blue reflected light, and the detection unit 614 detects the yellow reflected light R3 and R4. Is compared with the threshold value of the yellow reflected light set in advance (step S33), and the intensity of any of the blue reflected light R1, R2 or the yellow reflected light R3, R4 is reduced. If it exceeds the threshold, it is determined that foreign matter is mixed in the yarn Y (steps S34 and S35). When the intensity reduction of any of the blue reflected lights R1 and R2 and the yellow reflected lights R3 and R4 does not exceed the threshold value, the foreign matter detection of the yarn Y is continued.

  According to the third embodiment of the present invention described above, blue LEDs are used for the first LED 411 and the second LED 412 as the first light source 42, and the third LED 413 and the fourth LED 414 as the second light source 43 are used. A yellow LED is used. Blue light is light that has a large difference between the light reflectance of the fiber that is the raw material and the light reflectance of the foreign material with respect to foreign materials of many colors other than blue, but the blue foreign material is a raw material. The difference between the light reflectance of the fiber and the light reflectance of the foreign matter is not large. Therefore, detection of blue foreign matter is facilitated by using yellow light, which is light with a large difference between the light reflectance of the raw material fiber and the light reflectance of the foreign matter, for the blue foreign matter. For this reason, even if the color of foreign matters mixed in normal cotton fibers (for example, white) is various colors including blue (for example, black, red, green, yellow, light yellow, blue), the foreign matters are not The intensity information of the reflected light is likely to change in the mixed part, and foreign substances of various colors including blue can be easily detected. In particular, foreign substances of various colors mixed in the white yarn Y can be detected efficiently.

  Further, the running yarn Y is irradiated with the blue light D1 and D2 from the first light source 42 on the upstream side and the yellow light D3 and D4 from the second light source 43 on the downstream side. By irradiating the stripe Y, the blue reflected lights R1 and R2 and the yellow reflected lights R3 and R4 are not mixed, and foreign substances of various colors including blue can be detected easily and reliably. it can.

  Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made. For example, although the white cotton fiber has been described as the fiber constituting the yarn Y, the color and type are not limited as long as the fiber can form the yarn Y, such as wool.

  Moreover, although yellow light was used as the second light source that is a light source other than blue light, the present invention is not limited to this, and visible light or invisible light other than blue can be used in addition to green and red.

  In addition, although the light source color is the color of the light source itself, a filter or the like may be provided in the light source to change the color of light to be irradiated.

  Moreover, although the foreign material detection apparatus 31 was provided in one place along the running direction of the yarn Y, you may arrange | position in multiple places along the running direction of the yarn Y.

  In the first embodiment, the blue light sources are arranged in two places, but may be arranged in one place or three places or more.

  Further, in the second and third embodiments, the blue light source and the yellow light source are arranged in two places, but the invention is not limited to this, and can be arranged in any number of places, Furthermore, you may combine the light source of 3 or more colors.

  In the first to third embodiments, the detection unit determines whether foreign matter is mixed by comparing the intensity information about each reflected light with a preset threshold value. The method is not limited to this. For example, the intensity information is not the intensity information of each reflected light, but is a combination of the reflected lights, the average value of all the reflected lights, or the intensity information of the reflected light and the light transmitted without being reflected ( It may be combined with intensity information of transmitted light.

DESCRIPTION OF SYMBOLS 1 Pneumatic spinning machine 31 Foreign material detection apparatus 32 Casing 331 1st optical path 332 2nd optical path 333 3rd optical path 334 4th optical path 41 Light source part 42 1st light source 43 2nd light source 411 1st LED
412 2nd LED
413 3rd LED
414 4th LED
51 1st light receiving part 52 2nd light receiving part 511 1st light receiving element 512 2nd light receiving element 513 3rd light receiving element 514 4th light receiving element 61 Clearer controller 611,613 Light source control part 612,614 Detection part S Sliver Y Yarn P package

Claims (9)

A foreign matter detection device for detecting the presence or absence of foreign matter mixed in a yarn,
A light source unit for irradiating the yarn with light;
A light receiving portion for receiving reflected light from the yarn,
Based on the intensity information of the reflected light from the light receiving unit, a detection unit for detecting the presence or absence of the foreign matter,
With
The foreign matter detection apparatus, wherein the light source unit includes a first light source that is a blue light source.   The foreign object detection device according to claim 1, wherein the light source unit further includes a second light source that is a light source of light other than blue light.   The foreign object detection device according to claim 2, wherein the first light source and the second light source alternately irradiate the yarn with light.   4. The foreign object detection device according to claim 2, wherein the first light source and the second light source are arranged on an upstream side and a downstream side in a running direction of the yarn. 5.   A textile machine comprising the foreign object detection device according to any one of claims 1 to 4. A foreign matter detection method for detecting the presence or absence of foreign matter mixed in a yarn,
A foreign matter detection method comprising irradiating the yarn with blue light and determining the presence or absence of the foreign matter based on an intensity of reflected light from the yarn. A foreign matter detection method for detecting the presence or absence of foreign matter mixed in a yarn,
A foreign matter detection method, wherein the yarn is irradiated with blue light and light other than blue light, and the presence or absence of the foreign matter is determined based on the intensity of reflected light from the yarn. A foreign matter detection method for detecting the presence or absence of foreign matter mixed in a yarn,
A foreign matter detection method, wherein the yarn is alternately irradiated with blue light and light other than blue light, and the presence or absence of the foreign matter is determined based on the intensity of reflected light from the yarn. A foreign matter detection method for detecting the presence or absence of foreign matter mixed in a yarn,
The yarn is irradiated with blue light and light other than blue light on the upstream side and the downstream side in the running direction of the yarn, and the presence or absence of the foreign matter is determined based on the intensity of the reflected light from the yarn. A foreign matter detection method characterized by the above.

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