阅读说明：本技术 织机的织疵检查方法和织机的织疵检查装置 (Weaving defect inspection method and weaving defect inspection device for weaving machine ) 是由 铃木昭宏 松井正清 辻良平 于 2019-06-26 设计创作，主要内容包括：本发明提供能够通过一次拍摄检测正常间距、并能够以高精度检查织疵的有无的织机的织疵检查方法和织机的织疵检查装置。以使织物(W)的纬纱(Y)中的织机停止后的织造再次开启时所被引纬的纬纱亦即织造接头纱(Ys)包含于拍摄范围的方式拍摄织物(W),根据织物(W)的拍摄图像(S)中的从织造接头纱(Ys)以规定距离(L)向织物卷绕侧分离的第1图像域(E1),对纬纱(Y)的正常间距进行计算,通过将包含织造接头纱(Ys)的第2图像域(E2)中的纬纱的间距与正常间距进行比较,来判定织物(W)中的织疵的有无。(The invention provides a weaving defect inspection method for a weaving machine and a weaving defect inspection device for a weaving machine, which can detect a normal pitch by one-time shooting and can inspect the existence of weaving defects with high precision. The method comprises the steps of photographing a fabric (W) so that a weaving joint yarn (Ys), which is a weft yarn inserted when weaving is restarted after stopping the loom, is included in a photographing range, calculating a normal pitch of the weft yarn (Y) from a 1 st image field (E1) of a photographed image (S) of the fabric (W), the 1 st image field being separated from the weaving joint yarn (Ys) to a fabric winding side by a predetermined distance (L), and comparing the pitch of the weft yarn in a 2 nd image field (E2) including the weaving joint yarn (Ys) with the normal pitch to determine the presence or absence of a weaving defect in the fabric (W).)

1. A weaving defect inspection method for a weaving machine,

the fabric is photographed in such a manner that a weft yarn inserted when weaving is restarted after the loom is stopped, that is, a weaving joint yarn, among weft yarns of the fabric is included in a photographing range,

calculating a normal pitch of weft yarns based on a 1 st image field separated from the weaving joint yarns by a prescribed distance to a fabric winding side in the photographed image of the fabric,

determining the presence or absence of a weaving defect in the fabric by comparing the pitch of the weft yarn in the 2 nd image field containing the weaving joint yarn with the normal pitch.

2. A weaving defect inspection method for a weaving machine according to claim 1,

the weaving joint yarn is separated from the center of the shooting range to the reed side for shooting.

3. A weaving defect inspection method for a weaving machine according to claim 1 or 2,

the 1 st image field occupies 2/3 on the wound side of the web in the captured image.

4. A weaving defect inspection device for a weaving machine is characterized by comprising:

a camera which photographs a fabric so that a weaving joint yarn, which is a weft inserted when weaving is started again after a loom is stopped, among weft yarns of the fabric is included in a photographing range;

a calculation unit that calculates a normal pitch of weft yarns based on a 1 st image area separated from the weaving joint yarn by a predetermined distance toward a fabric winding side in the captured image of the fabric; and

and a determination unit that determines the presence or absence of a weaving defect in the fabric by comparing the pitch of the weft yarn in the 2 nd image field containing the weaving joint yarn with the normal pitch.

5. A weaving defect inspection apparatus for a weaving machine according to claim 4,

and a camera for shooting the fabric, wherein the weaving joint yarn is separated from the center of the shooting range to the reed side for shooting.

6. A weaving defect inspection apparatus for a weaving machine according to claim 4 or 5,

the 1 st image field occupies 2/3 on the wound side of the web in the captured image.

Technical Field

The present invention relates to a weaving defect inspection method for a weaving machine and a weaving defect inspection device for a weaving machine.

Background

The loom in weaving may stop operating for some reason. When the loom stops operating, a defect called a weaving defect may occur in the fabric being woven. In order to eliminate the weaving defect, it is necessary to detect the weaving defect when the weaving defect occurs in the fabric. Patent document 1 describes a weaving defect inspection method for a weaving machine for inspecting a weaving defect by imaging the weaving defect, and a weaving defect inspection apparatus for a weaving machine provided with a camera for imaging the weaving defect. In the weaving defect inspection method of the loom of patent document 1, a normal weft pitch is set in advance, and the presence or absence of a weaving defect is inspected by imaging the fabric.

Patent document 1: japanese patent laid-open publication No. 2004-131867

However, in the weaving defect inspection method of the weaving machine of patent document 1, it is difficult to inspect the weaving defect with high accuracy. The reason for this is that the actual normal pitch of the fabric sometimes deviates from the preset normal pitch. Specifically, in the loom, even when the normal pitch is set in advance at 50 pieces/inch, for example, the normal pitch of the fabric actually woven may be 49.5 pieces/inch. In this case, if the difference in divergence is larger than a difference (threshold value) between a preset normal pitch and a pitch of the weaving defect, the presence or absence of the weaving defect cannot be accurately checked. In addition, for another reason, a dimensional error occurs between the actual imaging range and the preset imaging range. In order to check the presence or absence of a weaving defect, image analysis including processing for converting the size of the imaging range into the number of pixels is performed, but if a dimensional error occurs between the actual imaging range and a preset imaging range, the accuracy of checking the presence or absence of a weaving defect is degraded by the conversion including the dimensional error.

However, there is a conceivable weaving defect inspection method for a weaving machine in which a normal pitch set in advance in the weaving machine is not used, but the normal pitch is detected by imaging a woven fabric, and the presence or absence of a weaving defect is inspected based on the detected normal pitch. However, imaging for detecting a normal pitch and imaging for inspecting the presence or absence of a weaving defect are required, respectively, and there is a problem in that the number of imaging times increases.

Disclosure of Invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a weaving defect inspection method for a weaving machine and a weaving defect inspection device for a weaving machine, which can calculate a normal pitch by one shot and can inspect a weaving defect with high accuracy.

In order to solve the above-described problems, the present invention is characterized in that the fabric is photographed so that a weaving joint yarn, which is a weft yarn to be inserted when weaving is restarted after the loom is stopped, is included in a photographed range, a normal pitch of the weft yarn is calculated from a 1 st image field separated from the weaving joint yarn by a predetermined distance toward a fabric winding side in a photographed image of the fabric, and the presence or absence of a weaving defect in the fabric is determined by comparing the pitch of the weft yarn in a 2 nd image field including the weaving joint yarn with the normal pitch.

In the present invention, the normal pitch of weft yarns is calculated from the 1 st image field of the captured image, and the pitch of weft yarns in the 2 nd image field containing weaving joint yarns is compared with the normal pitch, thereby determining the presence or absence of a weaving defect in the captured image. Therefore, the calculation of the normal pitch and the determination of the presence or absence of a weaving defect with high accuracy based on the calculated normal pitch can be performed from the captured image obtained by one shot. As a result, the time required for inspecting the presence or absence of a weaving defect can be reduced.

In the weaving defect inspection method for a weaving machine, the weaving joint yarn may be separated from the center of the imaging range to the reed side and imaged.

In this case, the image region to be subjected to the calculation of the normal pitch can be enlarged, and the error in the calculation of the normal pitch can be reduced. As a result, the discrimination rate of the weaving defect in the judgment of the presence or absence of the weaving defect based on the normal pitch is improved.

In the weaving defect inspection method for a weaving machine, the 1 st image area may occupy 2/3 on the side of the captured image where the fabric is wound.

In this case, since the region of the 1 st image separated from the weaving joint yarn by a predetermined distance toward the fabric winding side occupies 2/3 on the fabric winding side in the captured image, the number of weft yarns to be subjected to the calculation of the normal pitch becomes large, and the accuracy of the calculation of the normal pitch can be improved. As a result, the discrimination rate of the weaving defect in the judgment of the presence or absence of the weaving defect based on the normal pitch is further improved.

Further, the present invention is characterized by comprising: a camera which photographs the fabric so that a weaving joint yarn, which is a weft inserted when weaving is started again after the loom is stopped, among weft yarns of the fabric is included in a photographing range; a calculation unit that calculates a normal pitch of weft yarns based on a 1 st image region separated from the weaving joint yarn by a predetermined distance toward a fabric winding side in the captured image of the fabric; and a determination unit that determines the presence or absence of a weaving defect in the fabric by comparing the pitch of the weft yarn in the 2 nd image field including the weaving joint yarn with the normal pitch.

In the present invention, the normal pitch is calculated from the 1 st image field of the captured image, and the pitch of the weft in the 2 nd image field including the weaving joint yarn is compared with the normal pitch, whereby the presence or absence of the weaving defect in the captured image can be determined.

According to the present invention, it is possible to provide a weaving defect inspection method for a weaving machine and a weaving defect inspection device for a weaving machine, which can calculate a normal pitch by one shot and can inspect a weaving defect with high accuracy.

Drawings

Fig. 1 is a perspective view showing an outline of an air jet loom and a weaving defect inspection device for an air jet loom according to embodiment 1 of the present invention.

Fig. 2 is a side view showing a main part of a weaving defect inspection apparatus of an air jet loom.

Fig. 3 is a schematic block diagram of a weaving defect inspection device of an air jet loom.

Fig. 4 is a diagram showing a captured image of a fabric.

Fig. 5(a) is a graph showing a normal pitch in each captured image, and (b) is a graph showing a pitch ratio in each captured image.

Fig. 6 is a diagram showing a captured image of the fabric according to embodiment 2.

Fig. 7 (a) is a graph showing a normal pitch in each captured image according to embodiment 2, and (b) is a graph showing a pitch ratio in each captured image according to embodiment 2.

Description of the reference numerals

An air jet loom; a head rail; reed; a functional panel; a weaving defect inspection device; a camera; an image monitor; a controller; an image analysis unit; a calculation section; a determination section; s. shooting an image; e1, E3... 1 st image domain; e2, E4... 2 image domain; l.. distance; p.. normal spacing; pt.. average pitch; t. warp yarns; y.. weft yarns; ys..

Detailed Description

(embodiment 1)

A weaving defect inspection method for a weaving machine and a weaving defect inspection device for a weaving machine according to embodiment 1 will be described below with reference to the drawings. First, a loom according to the present embodiment will be described, and the loom of the present embodiment is an air jet loom.

As shown in fig. 1, the air jet loom 10 includes a pair of left and right side frames 11 and 12. The pair of left and right side frames 11 and 12 are coupled by a plurality of cross rails (not shown). The air jet loom 10 includes a warp beam (not shown) around which warp yarns are wound and a cloth roller 13 around which a woven fabric W is wound. The warp beam forms part of a delivery device for delivering warp yarns, and the cloth roller 13 forms part of a take-up device for taking up the fabric W.

The air jet loom 10 includes a head rail 14 at an upper portion thereof. A reed 15 for beating up the weft inserted between the warp yarns opened vertically is provided below the head rail 14. The side frame 11 at the left end of the air jet loom 10 is provided with a function panel 16 for checking and operating the operating state of the air jet loom 10. In fig. 1, illustration of a delivery device including a warp beam, a weft insertion device including a weft insertion nozzle, and a shedding device including a heald frame is omitted.

As shown in fig. 1 and 2, the weaving defect inspection device 17 of the present embodiment is attached to the head rail 14. The weaving defect inspection device 17 includes a camera 18 and an image monitor 19 as a display unit. The camera 18 is fixed to one end portion of a support plate member 20 bent substantially in an L shape. The vicinity of the other end of the support plate member 20 is attached to the head rail 14 by a bracket 21 and a bolt 22.

The support plate member 20 is provided with a through hole 23 through which the bolt 22 is inserted. The bracket 21 is a plate member having a plurality of screw holes 24 into which the bolts 22 are screwed. In a state where the support plate member 20 is mounted on the head rail 14, the axis of the camera 18 is orthogonal to the fabric W. The image monitor 19 is attached to the head rail 14 near the camera 18 by a fixing metal fitting (not shown). The camera 18 is provided with an illumination lamp 25 that illuminates the same direction as the axis of the camera 18. The illumination lamp 25 includes: the ability to capture the illumination required of the fabric W with the camera 18 is achieved even if the fabric W is dark. The illuminance formed by the illumination lamp 25 can be adjusted.

As shown in fig. 3, the weaving defect inspection apparatus 17 includes a controller 30 connected to the camera 18 and the image monitor 19. The controller 30 includes an image analyzing unit 31, a calculating unit 32, and a determining unit 33. The image analysis unit 31 analyzes the captured image S of the web W captured by the camera 18. The calculation unit 32 calculates the normal pitch of the weft yarn from the analysis result by the image analysis unit 31. The determination unit 33 determines the pitch ratio based on the normal pitch of the weft yarn calculated by the calculation unit 32 to determine the presence or absence of the weaving defect. The image monitor 19 displays the normal pitch of the weft and the determination result obtained by the determination unit 33. The following is made for the normal pitch and pitch ratio of the weft yarns.

Next, a method of inspecting a weaving defect of the air jet loom 10 according to the present embodiment will be described. In the present embodiment, a weaving defect is inspected for a woven fabric W woven in a trial run. Specifically, the air jet loom 10 in the test operation is once stopped, and after the operation is started again after the stop, the operation is further stopped, and the weaving defect in the fabric W is inspected. Further, the weaving defect of the web W may be checked without stopping the operation.

First, the position of the camera 18 with respect to the web W is adjusted, and the web W is photographed by the camera 18. More specifically, as shown in fig. 4, the position of the camera 18 is adjusted so that the weaving joint yarn Ys, which is the weft inserted between the warp T and the stop of the air jet loom 10 among the weft Y of the fabric W, is included in the imaging range of the camera 18 when the weaving is started again, and then the fabric W is imaged. In the present embodiment, the weaving joint yarn Ys is separated toward the reed 15 side from the center between the fabric winding side end and the reed 15 side end in the imaging range of the camera 18. In the present embodiment, the camera 18 photographs the fabric W so that 30 weft yarns Y are included in the photographed image S.

Next, image analysis processing including conversion processing for converting the captured image S of the web W captured into the number of pixels in the image analysis unit 31 is performed. The weft yarn Y in the captured image S can be identified by image analysis processing. The image analysis unit 31 outputs the pitch between all the weft yarns Y identified from the captured image S by image analysis processing.

After the analysis processing of the captured image S, the calculation unit 32 calculates the normal pitch P of the weft yarn Y. The normal pitch P of the weft yarns Y is calculated based on the pitch of the weft yarns Y in the 1 st image field E1. Specifically, the average pitch of the pitches of the weft yarns Y included in the 1 st image field E1 is obtained, and the obtained average pitch is defined as the normal pitch P. The 1 st image field E1 corresponds to an image field separated from the weaving joint yarn Ys by a predetermined distance L toward the fabric winding side (front side). The 1 st image field E1 of the present embodiment is a region occupying 2/3 of the entire captured image S, and 20 weft yarns Y are present in the 1 st image field E1. The pitch of the weft yarn Y in the 1 st image field E1 is output from the image analysis unit 31.

The graph shown in FIG. 5(a) shows the normal pitch P of the weft yarns Y contained in the 1 st image field E1 for each 30 shot images (S-1 to S-30). The 30 captured images S can be obtained by, for example, capturing the web W30 times while changing the position in the web width direction.

The calculation unit 32 also obtains the average pitch Pt of the weft yarns Y in the 2 nd image field E2. The average pitch Pt is obtained by calculating the average pitch of the pitches of the weft yarns Y in the 2 nd image field E2. The 2 nd image area E2 corresponds to an image area on the reed 15 side (rear side) with respect to the weaving yarn Ys in the captured image S. The pitch of weft yarn Y in the 2 nd image field E2 is output from the image analysis unit 31. The 2 nd image field E2 contains woven connector yarns Ys.

If the air jet loom 10 stops weaving for some reason, a weaving defect is likely to occur after the weaving after the stop is started again. In other words, a weaving defect is easily generated in the 2 nd image area E2 in the captured image S. In the weaving defect, there are a thick portion in which the pitch of the weft yarn Y is smaller than the normal pitch P, a thin portion in which the pitch of the weft yarn Y is larger than the normal pitch P, and a pillow portion in which the weft yarn is shifted in position in the vertical direction. In the present embodiment, a thick portion and a thin portion are targeted for inspection. The calculation unit 32 determines the ratio (Pt/P) between the normal pitch P obtained by the calculation unit 32 and the average pitch Pt of the 2 nd image area E2. The graph shown in fig. 5 (b) shows the pitch ratio (Pt/P) between the normal pitch P and the average pitch Pt of the 2 nd image field E2 for each 30 captured images (S-1 to S-30).

Next, the determination unit 33 determines the presence or absence of a weaving defect (thick or thin) in the web W based on the pitch ratio (Pt/P) which is the ratio between the normal pitch P obtained by the calculation unit 32 and the average pitch Pt of the 2 nd image area E2. In the case where the 2 nd image area E2 contains a thick segment, the pitch ratio (Pt/P) is less than 1. In the case where the 2 nd image area E2 contains a thin section, the pitch ratio (Pt/P) exceeds 1. At a pitch ratio (Pt/P) of 1, thick and thin sections are not present in the 2 nd image field E2. In the graph shown in fig. 5 (b), the photographed images (S-1 to S-15) indicate the presence of thick sections, and the photographed images (S-16 to S-30) indicate the presence of thin sections.

In this way, in the present embodiment, the normal pitch P of the 1 st image region E1 and the average pitch Pt of the 2 nd image region E2 are calculated from 1 captured image S, and the presence or absence of a weaving defect in the web W can be determined based on the pitch ratio (Pt/P) between the normal pitch P and the average pitch Pt. In other words, the presence or absence of a weaving defect of the fabric W can be determined by comparing the average pitch Pt of the weft yarns in the 2 nd image field E2 containing the weaving joint yarns Ys with the normal pitch P. Based on the determination result, each part of the air jet loom 10 is adjusted so that no weaving defect occurs even when the air jet loom 10 stops. Specifically, the operator may input a numerical value or the like corresponding to the adjustment item to the function panel 16.

The method for inspecting a weaving defect of the air jet loom 10 and the weaving defect inspection apparatus 17 according to the present embodiment have the following operational advantages.

(1) A normal pitch P is calculated from a 1 st image area E1 of a captured image S, an average pitch Pt is calculated from a 2 nd image area E2 including a weaving yarn Ys, and the presence or absence of a weaving defect in the captured image S is determined by comparing the average pitch Pt with the normal pitch P. Therefore, the calculation of the normal pitch P and the average pitch Pt and the determination of the presence or absence of a weaving defect with high accuracy based on the calculated normal pitch P and average pitch Pt can be performed from the captured image S obtained by one shot. As a result, the time required for inspecting the presence or absence of a weaving defect can be reduced.

(2) Since the weaving yarn Ys is separately photographed from the center of the photographing range to the reed 15 side, the 1 st image area E1 to be the object of calculation of the normal pitch P can be enlarged. Therefore, the number of weft yarns Y to be subjected to the calculation of the normal pitch P can be increased, and the error in the calculation of the normal pitch P can be reduced. As a result, the discrimination rate of the weaving defect in the judgment of the presence or absence of the weaving defect based on the normal pitch P is improved.

(3) Since the 1 st image field E1 occupies 2/3 on the fabric winding side in the captured image S, the number of weft yarns Y to be subjected to calculation of the normal pitch P increases, and the accuracy of calculation of the normal pitch P can be improved. As a result, the discrimination rate of the weaving defect in the judgment of the presence or absence of the weaving defect based on the normal pitch P is further improved.

(4) The weaving defect inspection device 17 includes: the device includes a camera 18 for imaging the fabric W so that a weaving joint yarn Ys in a weft yarn Y of the fabric W is included in an imaging range, a calculation unit 32 for calculating a normal pitch P and an average pitch Pt, and a determination unit 33 for determining the presence or absence of a weaving defect in the fabric W. Therefore, the normal pitch P is calculated from the 1 st image area E1 of the captured image S, and the average pitch Pt is calculated from the 2 nd image area E2 including the weaving joint yarn Ys, so that the presence or absence of a weaving defect in the captured image S can be determined by comparing the average pitch Pt with the normal pitch P.

(5) In the present embodiment, the normal pitch P and the average pitch Pt are calculated based on the photographed image S of the fabric W, instead of setting the normal weft pitch in advance and photographing the fabric to check the presence or absence of a weaving defect as in the conventional art. Therefore, the actual normal pitch of the woven fabric does not deviate from the preset normal pitch as in the conventional art, and the weaving defect can be inspected with high precision.

(embodiment 2)

Next, a weaving defect inspection method for a weaving machine and a weaving defect inspection apparatus for a weaving machine according to embodiment 2 will be described. In the present embodiment, the weaving joint yarn of the captured image is positioned at the center of the captured range, which is different from embodiment 1, but the order of the weaving defect inspection method and the configuration of the weaving defect inspection apparatus are the same as those in embodiment 1.

As shown in fig. 6, in the present embodiment, the position of the camera 18 is adjusted so that the weaving joint yarn Ys is included in the imaging range of the camera 18, but the weaving joint yarn Ys is located at the center of the imaging range of the camera 18. The normal pitch P of the weft yarns Y in the present embodiment is calculated based on the pitch of the weft yarns Y in the 1 st image field E3. The average pitch of the pitches of the weft yarns Y included in the 1 st image field E3 is obtained, and the obtained average pitch is defined as the normal pitch P. The 1 st image field E3 corresponds to an image field separated from the weaving joint yarn Ys by a predetermined distance L toward the fabric winding side (front side).

The 1 st image field E3 of the present embodiment is a region occupying 1/3 of the entire captured image S, and 10 weft yarns Y are present in the 1 st image field E3. The graph shown in FIG. 7 (a) shows the normal pitch P of the weft yarns Y contained in the 1 st image field E3 for each 30 shot images (S-1 to S-30). Since 10 weft yarns Y are present in the 1 st image field E3, which is the subject of the normal pitch P, the variation in the normal pitch P among the captured images S is large when compared with the graph of fig. 5(a) of embodiment 1.

The calculation unit 32 determines the average pitch Pt of the weft yarns in the 2 nd image area E4 on the reed 15 side (rear side) with respect to the weaving joint yarn Ys in the captured image S. The number of weft yarns to be subjected to the average pitch Pt in the 2 nd image field E4 including the weaving joint yarn Ys is 15. The 2 nd image area E4 corresponds to an image area on the reed 15 side (rear side) with respect to the weaving yarn Ys in the captured image S. The calculation unit 32 determines the ratio (Pt/P) between the normal pitch P obtained by the calculation unit 32 and the average pitch Pt of the 2 nd image area E4. The graph shown in fig. 7 (b) shows the pitch ratio (Pt/P) between the normal pitch P and the average pitch Pt of the 2 nd image field E4 for each 30 captured images (S-1 to S-30).

The determination unit 33 determines the presence or absence of a weaving defect (thick or thin) in the web W based on a pitch ratio (Pt/P) which is a ratio of the normal pitch P obtained by the calculation unit 32 to the average pitch Pt of the 2 nd image area E4. In other words, the presence or absence of a weaving defect in the captured image S is determined by comparing the average pitch Pt with the normal pitch P. In the graph shown in fig. 7 (b), the photographed images (S-1 to S-15) indicate the presence of thick sections, and the photographed images (S-16 to S-30) indicate the presence of thin sections. In fig. 7 (b), the captured images S-2 and S-11 show the pitch ratio of the thin sections, but actually show the thick sections. This is false recognition caused by 10 weft yarns Y in the 1 st image field E3 to be the subject of the normal pitch P and 15 weft yarns Y to be the subject of the average pitch Pt in the 2 nd image field E4.

This embodiment has the same operational effects as the operational effects (1), (4), and (5) of embodiment 1. The center position in the imaging range corresponds to a portion of a lens (not shown) provided in the camera 18 where distortion of the lens is minimum. Therefore, the weaving yarn Ys is hardly affected by the distortion of the lens in the image analysis of the captured image S, and erroneous recognition due to the lens distortion does not occur.

The above-described embodiment shows one embodiment of the present invention, but the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the invention as described below.

The 1 st image area for calculating the normal pitch is defined as an area occupying 2/3 in the entire captured image in the above-described 1 st embodiment, and is defined as an area occupying 1/3 in the entire captured image in the 2 nd embodiment, but is not limited thereto. The proportion of the 1 st image domain used for calculating the normal pitch to the entire captured image may be, for example, a proportion other than 2/3 and 1/3 as in 1/2 or the like.

In the above-described embodiment, the 1 st image field for calculating the normal pitch is set to a section from a position separated from the weaving joint yarn by a predetermined distance to the fabric winding side (front side) to the end of the fabric winding side (front side), but is not limited thereto. The 1 st image area for calculating the normal pitch may be from a position separated by a predetermined distance to the position near the end of the web winding side (front side). Similarly, the 2 nd image area on the reed side (rear side) with respect to the weaving joint yarn for solving the average pitch may be from the weaving joint yarn to the front of the end on the reed side. The predetermined distance from the weaving joint yarn may be appropriately changed according to weaving conditions. Further, the entire area on the reed side of the 1 st image area for calculating the normal pitch or a partial area including at least the weaving joint yarn may be set as the 2 nd image area.

In the above-described embodiment, the camera of the weaving defect inspection device is fixed to the air jet loom and the imaging is performed, but the present invention is not limited thereto. The weaving defect inspection device may be a device that photographs a fabric as being movable without being fixed to an air jet loom, for example.