CN112030328B

CN112030328B - Loom shedding failure detection device

Info

Publication number: CN112030328B
Application number: CN202010473473.9A
Authority: CN
Inventors: 铃木昭宏; 松井正清; 辻良平
Original assignee: Toyota Industries Corp
Current assignee: Toyota Industries Corp
Priority date: 2019-06-03
Filing date: 2020-05-29
Publication date: 2021-08-17
Anticipated expiration: 2040-05-29
Also published as: CN112030328A; JP2020196972A

Abstract

The invention provides a shedding fault detection device of a loom, which can detect the shedding fault of a warp group with high precision. The loom opening defect detection device comprises: a camera (36) which photographs the opening of the warp yarn (T) group on one side of the warp yarn group which is opened up and down by the heald frame (17) towards the other side; a light irradiator (37) which performs surface light emission that irradiates light to the camera (36) on the other side of the warp yarn (T) group; and a control device (38) which detects the defective opening according to a camera image which is shot by the camera (36) and has an opening projected by using the light irradiator (37) as a background.

Description

Loom shedding failure detection device

Technical Field

The present invention relates to a shedding failure detection device for a loom.

Background

Conventionally, there is known a stop mechanism for a loom during warp cutting, in which an electric signal is sent from a computer to a stop device of the loom to immediately stop the loom when an image of an opening shape of an opening sent from a video camera to the computer is different from a previously registered opening shape (for example, see patent document 1). In the stop mechanism for a warp cutting loom of patent document 1, a video camera is provided on an extension line on one side in the width direction of a warp group on the opposite side of the traveling direction of the warp group across the heald frames of the loom, the shedding shape of the shedding portion formed by the heald frame is detected, and the shedding shape of the shedding portion determined by the material of the yarn, the number of the heald frames, and the like is registered in advance in a computer.

According to the stop mechanism of the loom for cutting warp in patent document 1, the video camera and the computer can stop the loom immediately at the time of cutting warp or at the time of winding warp, and thus there is no case where the stop mechanism is used, and therefore, there is no trouble in the work of attaching the warp group to the stop mechanism at all.

Patent document 1: japanese Kokai publication Hei 2-3488

However, in the stop mechanism of the loom in the warp cutting of patent document 1, although the shape of the shedding of the warp group is detected by the video camera, various objects are caught behind the shedding of the warp group in the captured image of the video camera, and therefore, there is a problem that the image processing of the shedding of the warp group becomes difficult. If the image processing of the openings of the warp yarn group becomes difficult, the defective opening of the warp yarn group cannot be detected accurately.

Disclosure of Invention

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a shedding defect detection device for a loom, which can accurately detect a shedding defect of a warp yarn group.

In order to solve the above problem, the present invention is characterized by comprising: a camera which photographs the opening of a warp group opened vertically by a heald frame from one side of the warp group toward the other side; a light irradiator for emitting light on a surface of the other side of the warp yarn group, the surface being irradiated with light toward the camera; and a detection unit that detects an opening defect based on a camera image that is captured by the camera and on which the opening is projected using the light irradiator as a background.

In the present invention, the camera photographs the warp yarn group openings on one side of the warp yarn group toward the other side. The detection unit detects an opening defect from a camera image of an opening projected with the light irradiator as a background. Specifically, the defective shedding of the warp yarn group is, for example, cutting of the warp yarn, slackening of the warp yarn, or entanglement of the warp yarn. According to the present invention, a defective opening can be detected with high accuracy using a camera. That is, in a camera image captured by the camera, an opening projected with the light irradiator as a background is captured, and therefore the opening in the camera image is shadowed, and the background of the opening is bright. Therefore, image processing is easier than in the conventional camera image in which various objects are captured.

In the shedding failure detection device for a loom, the camera may be disposed closer to the reed side than the heald frames in the front-rear direction of the warp group, and the light irradiator may be provided with a weft passage for allowing passage of a weft.

In this case, the light irradiation device is provided with a weft passage that allows the passage of weft, and thus the light irradiation device can obtain a camera image of the opening of the warp group projected in a wider range without obstructing the passage of weft. As a result, the detection unit can detect the opening defect with higher accuracy.

In the loom shedding failure detection device, the light irradiator may be turned on in accordance with the timing of shooting by the camera.

In this case, the light irradiator is turned on in conformity with the shooting timing of the camera. In other words, the light irradiator is not turned on at the timing when the camera is not photographing, and therefore, it is not necessary to continuously turn on and irradiate the light irradiator.

According to the present invention, it is possible to provide a shedding defect detection device for a loom, which can detect a shedding defect of a warp group with high accuracy.

Drawings

Fig. 1 is a side view showing a shedding failure detection device of a loom according to embodiment 1.

Fig. 2 is a plan view showing a shedding failure detection device of the loom according to embodiment 1.

Fig. 3 is a side view showing a main part of the shedding and imaging area of the warp yarn group of the present invention.

Fig. 4 is a perspective view of a light irradiator provided in the opening defect detection apparatus.

Fig. 5 is a diagram showing a reference image.

Fig. 6 is an example of a camera image showing an example of a defective opening.

Fig. 7 is a plan view showing a shedding failure detection device of the loom according to embodiment 2.

Fig. 8 is a side view showing a shedding failure detection device of a loom according to embodiment 2.

Description of reference numerals

10 … weaving machine; 11 … side frame; 15 … warp yarn opening device; 16 … reed; 17 … heald frame; 30 … in-reed passage; 31 … primary nozzle; 35. 50 … poor opening detection device; 36. a 51 … camera; 37. 52 … light illuminator; 38 … control device; 39 … a housing; 40 … a light emitting portion; 41 … a diffuser plate; 42 … notch; e1, E2 … shooting areas; ps … reference image; p1, P2, P3 … camera images; a T … warp yarn; t1 … warp yarn (cut); t2 … warp yarn (slack); t3 … warp yarns (wrap); y … weft yarn; w … fabric.

Detailed Description

(embodiment 1)

Hereinafter, a shedding failure detection device for a loom according to embodiment 1 will be described with reference to the drawings. First, a loom provided with a shedding failure detection device will be described.

The loom 10 shown in fig. 1 is an air jet loom that flies a weft yarn by compressed air and inserts the weft yarn to an opening of a warp yarn T group. As shown in fig. 2, the loom 10 includes a pair of left and right side frames 11. In fig. 1, only one side frame 11 is illustrated. The loom 10 is provided with a warp beam 12 at the rear. The warp beam 12 is supported by a beam support 13 fixed to the rear of the side frame 11. A plurality of warp yarns T are wound around the warp beam 12 in the width direction. A cross member 14 supported by the side frames 11 is provided at the front of the loom 10. The cross member 14 is used to wind the woven fabric W.

The loom 10 includes a warp shedding device 15 for shedding a group of warp yarns T fed from a warp beam 12 and a reed 16 for beating up a weft yarn Y to be inserted. The warp shedding device 15 includes a plurality of heald frames 17 driven by a loom driving motor (not shown) and moved up and down by the driving of the loom driving motor. The warp T groups opened by the heald frames 17 are formed by the upper warp T group and the lower warp T group. The reed 16 swings back and forth to perform beating-up motion by receiving transmission of driving force of a driving motor of the loom. Weaving is performed by repeating shedding of the warp T by the warp shedding device 15, weft insertion by the weft Y, and beating up by the reed 16.

A back roller 18 and a tension roller 19 are provided above the warp beam 12. The rear roller 18 and the tension roller 19 are provided on a roller mount 20 attached to the side frame 11. The warp T sent out from the warp beam 12 is guided by the rear roller 18 and the tension roller 19 and sent out to the warp shedding device 15.

A plurality of press rollers 21, a surface roller 22, and a guide roller 23 are provided above the cross beam 14. The woven fabric W is guided by a press roller 21, a surface roller 22, and a plurality of guide rollers 23, and wound around the cross member 14.

In the case of the reed 16, as shown in fig. 2, the reed 16 includes a lower holding frame 26 and an upper holding frame 27 as shown in fig. 3, in addition to a sley 24 extending in the width direction of the machine base and a plurality of reed wires 25 arranged in the weft insertion direction on the sley 24. The reed wires 25 are in a flat plate shape and held by a lower holding frame 26 and an upper holding frame 27. As shown in fig. 2, a lower holding frame 26 holding a plurality of reed wires 25 is inserted into the mounting groove 24A of the sley 24, and is fixed to the sley 24 by a wedge member 28.

As shown in fig. 3, a guide recess 29 facing forward is formed in the reed wire 25. As shown in fig. 2, the guide recesses 29 of the plural reed wires 25 are provided continuously in the weft insertion direction, whereby the in-reed passage 30 of the weft yarn Y in the reed 16 is formed. The in-reed passage 30 is formed by the guide recesses 29 of the plural reed wires 25, and corresponds to a part of the weft passage. The warp yarns T are inserted between the reed wires 25, and a large number of warp yarns T inserted between the reed wires 25 constitute a group of warp yarns T forming a row.

A main nozzle 31 for weft insertion for inserting the weft yarn Y is provided on the upstream side of the reed passage 30, that is, on the side of the slay 24. Further, a plurality of sub-nozzles (not shown) for flying the weft yarn Y inserted are attached to the front surface of the slay 24. The reed 16, the main nozzle 31, and the sub-nozzles are arranged on the slay 24 and reciprocally swing in the front-rear direction of the loom 10. The weft yarn Y is inserted into the opening of the warp yarn T group by the air jet of the main nozzle 31, and flies in the reed passage 30 by the air jet of the main nozzle. As shown in fig. 3, the loom 10 includes a fell plate 32 that guides the cloth W forward of the reed 16.

However, the loom 10 of the present embodiment includes the shedding defect detection device 35 that detects a shedding defect of the warp T group. The shedding failure detection device 35 includes a camera 36 for imaging the shedding of the warp T group, a light irradiator 37 for observing the background of the shedding of the warp T group from the camera 36, and a controller 38 as a detection unit for detecting the shedding failure of the warp T group.

The camera 36 is a known camera, for example, a camera provided with a CCD image sensor or a C-MOS image sensor, and is a camera for taking a still picture. The camera 36 is disposed on the reed 16 side of the heald frame 17 in the front-rear direction of the warp T group. Specifically, as shown in fig. 2, the camera 36 is mounted to one side frame 11 near the main nozzle 31 that ejects the weft yarn Y.

As shown in fig. 2, the camera 36 is connected to the control device 38, and a signal of a camera image captured by the camera 36 is transmitted to the control device 38. The camera 36 photographs the openings of the warp T groups opened vertically by the heald frames 17 from one side frame 11 close to the main nozzle 31 on one side of the warp T group toward the other side frame 11 distant from the main nozzle 31 on the other side of the warp T group. As shown in fig. 3, the imaging area E1 that can be imaged by the camera 36 is an area that includes the upper warp T group and the lower warp T group in the swing range of the reed 16. In order to eliminate the detection omission of the opening defect, the photographing region E1 preferably covers the openings of the warp T group as large as possible. The camera 36 performs shooting while the reed 16 is retreated toward the heald frame 17 side after beating up, and the camera 36 is controlled by the control device 38.

As shown in fig. 4, the light irradiator 37 functions as a backlight for the openings of the warp yarn T group and is provided to form a background having high brightness for the openings of the warp yarn T group which is a shadow. The light irradiator 37 includes a housing 39 that houses a light source (not shown), a light source (not shown) housed in the housing 39, and a light emitting unit 40 that includes a diffusion plate 41 that forms light from the light source into uniform surface light. The light emitting source is a Light Emitting Diode (LED) that emits white light. The light irradiator 37 is attached to the other side frame 11 which is distant from the main nozzle 31 so that light can be irradiated to the camera 36 on the other side of the warp T group. Therefore, the light irradiator 37 faces the camera 36 through the warp T group.

A notch 42 is formed in the rear portion of the light irradiator 37 by partially cutting out the case 39 and the diffuser plate 41. The notches 42 form a weft passage that allows the passage of the weft yarn Y together with the reed passage 30 formed in the reed 16, and when the warp yarn T group is opened, the notches 42 are located between the upper warp yarn T group and the lower warp yarn T group. Therefore, the notch 42 is formed in the light irradiator 37, whereby the flight of the weft yarn Y is not hindered by the light irradiator 37. The size of the notch 42 may be any size that does not affect the air injection from the main nozzle 31 and the sub-nozzles.

The controller 38 has a function of detecting a defective shedding of the warp T group in addition to a function of controlling each part of the loom 10. The control device 38 includes an arithmetic processing unit 43 and a storage unit 44. The arithmetic processing unit 43 has a function of executing various programs and performing arithmetic processing on various data. The arithmetic processing unit 43 functions as an image analysis unit that analyzes the camera image captured by the camera 36, and also functions as a determination unit that determines the presence or absence of an opening defect by comparing the analyzed camera image with the reference image Ps shown in fig. 5. The storage unit 44 stores various programs and various data, and also stores the analyzed camera image and reference image Ps. The reference image Ps is stored in the storage unit 44 in advance.

The control device 38 of the present embodiment controls the shooting by the camera 36. Specifically, the control device 38 controls the camera 36 to perform imaging in response to a rotation signal of the main motor 45 of the loom 10 shown in fig. 2. The main motor 45 is provided with an encoder 46 that detects the rotation of the main motor 45, and the encoder 46 detects the rotation of the main motor 45 and transmits the detection result to the control device 38 as a rotation signal. The controller 38 is connected to the light irradiator 37, and controls the light irradiator 37 so as to turn on the light irradiator 37 in accordance with the shooting timing of the camera 36.

A display device 47 is connected to the control device 38, and the display device 47 can display a camera image and a reference image in addition to various information. The display device 47 of the present embodiment has a touch panel type monitor screen, and functions as an input unit capable of inputting data and the like as well as displaying information.

Next, the discrimination of the defective opening in the defective opening detecting device 35 of the present embodiment will be described. The operator of the loom 10 stores in advance the reference image Ps that is not considered to have a defective shedding in the storage unit 44 of the control device 38. The reference image Ps is an image obtained by image analysis of a camera image obtained by imaging the openings of the warp T group without the opening defect by the camera 36. The warp T groups and the warp T groups on the upper side of the reference image Ps, which form the openings, are projected in a straight line. The right side of the reference image Ps is the side from which the warp T is fed before weaving. The light emitting portion 40 of the light irradiator 37 is imaged on the background of the upper warp T group and the lower warp T group. In other words, the upper warp yarn T group and the lower warp yarn T group are projected onto the light irradiator 37 functioning as a backlight.

The loom 10 is operated to start weaving, and the camera 36 performs shooting. The camera 36 shoots in response to a rotation signal of the main motor 45 of the loom 10. Specifically, the camera 36 performs shooting every time the reed 16 retreats toward the heald frame 17 side after beating up. In other words, the camera 36 performs shooting each time based on the rotation signal of 0 °. The captured camera image is transmitted to the controller 38, and the controller 38 performs image analysis. The controller 38 compares the camera image obtained by image analysis with the reference image Ps to determine whether or not an aperture defect exists. In this way, the controller 38 detects the opening defect. When the shedding failure is not detected by the comparison between the captured camera image and the reference image Ps, the operation of the loom 10 is continued. When there is a difference in position on the image exceeding the allowable range by comparing the captured camera image with the reference image Ps, a defective shedding is detected, and the operation of the loom 10 is stopped.

Fig. 6 (a) to 6 (c) are views showing examples of defective openings. The camera image P1 shown in fig. 6 (a) captures an upper warp T group including the cut warp T1 and a lower warp T group without defects. Since the camera image P1 includes the cut warp T1, the controller 38 recognizes the cut warp T1 by comparing the reference image Ps and detects a defective shedding.

In the camera image P2 shown in fig. 6 (b), a warp T group including the warp T2 which is not cut but slackened and a lower warp T group without defects are captured. Since the camera image P2 includes the warp T2 with slack, the controller 38 compares the warp T2 with the reference image Ps to recognize the slack and detects a defective shedding.

In the camera image P3 shown in fig. 6 (c), a warp T group including the warp T3 twisted around another warp T and a warp T group on the lower side without defects are captured. Since the camera image P3 includes the warp T3 twisted around the other warp T, the controller 38 recognizes the warp T3 twisted around the other warp T by comparing the reference image Ps, and detects a defective shedding.

The example of the opening defect is not limited to the example of the opening defect shown in fig. 6 (a) to 6 (c). For example, there may be a case where at least one of the shedding defects from cutting, slackening, and twisting occurs in the lower warp T group, and a case where the shedding defects occur in the upper and lower warp T groups.

The opening defect detection device 35 of the present embodiment has the following operational advantages.

(1) The camera 36 photographs the openings of the warp yarn T groups on one side of the warp yarn T groups toward the other side. The controller 38 as a detection unit detects an opening defect by comparing a camera image of an opening projected with the light irradiator 37 as a background with a reference image Ps set in advance. The defective shedding is, for example, cutting of the warp T, slackening of the warp T, or entanglement of the warp T. The opening defect detection device 35 can detect an opening defect with high accuracy using 1 camera 36. In addition, since the opening projected with the light irradiator 37 as the background is photographed in the camera image photographed by the camera 36, the opening in the camera image is shaded, and the background of the opening is bright. Therefore, image processing is easier to perform than conventional camera images of various objects.

(2) The camera 36 is disposed closer to the reed 16 side than the heald frames 17 in the front-rear direction of the warp T group, and a part of a weft passage for allowing the passage of the weft Y is formed by the notch 42 in the light irradiator 37. Therefore, the light irradiator 37 can obtain a camera image of the openings of the warp T group projected in a wider range without obstructing the passage of the weft Y. As a result, the controller 38 can detect the opening defect with higher accuracy.

(3) The light irradiator 37 is lit up in conformity with the shooting timing of the camera 36. In other words, the light is not turned on at the timing when the camera does not perform photographing, and therefore, it is not necessary to continuously turn on and irradiate the light irradiator 37. Since the light irradiator 37 is turned on in accordance with the timing of the image capturing by the camera 36, the turn-on time of the light irradiator 37 is shortened, for example, as compared with a case where the light irradiator 37 is continuously turned on. As a result, the power consumption for lighting can be reduced, and the use period of the light irradiator 37 can be increased.

(4) Compared to the case where a plurality of cameras are used and imaging is performed by the cameras from above the opening, the opening defect can be detected by one camera 36, and therefore, the manufacturing cost of the opening defect detection device 35 can be reduced. Further, it is possible to detect the shedding failure of the upper warp T group with high accuracy, and also to detect the shedding failure of the lower warp T group with high accuracy.

(5) Since the camera image obtained by image analysis of the camera image projected on the opening of the light irradiator 37 and shadowed is compared with the reference image, it is possible to detect opening defects such as cutting of the warp T, slackening of the warp T, and twisting of the warp T with high accuracy.

(embodiment 2)

Next, a shedding failure detection device of a loom according to embodiment 2 will be described. The present embodiment is different from embodiment 1 in that the camera is disposed behind the heald frame in the front-rear direction of the warp group. In the present embodiment, the description of embodiment 1 is applied to the same configuration as embodiment 1, and common reference numerals are used.

As shown in fig. 7, the shedding defect detection device 50 of the loom 10 includes a camera 51 for imaging the shedding of the warp T group, a light irradiator 52 for observing the background of the shedding of the warp T group from the camera 51, and a control device 38 for detecting the shedding defect of the warp T group.

The camera 51 has the same configuration as the camera 36 of embodiment 1. The camera 51 is disposed closer to the warp T delivery side than the heald frames 17 in the front-rear direction of the warp T group. Specifically, as shown in fig. 7, the camera 51 is mounted on one side frame 11 that is closer to the main nozzle 31 that ejects the weft yarn Y.

As shown in fig. 7, the camera 51 is connected to the control device 38, and a signal of a camera image captured by the camera 51 is transmitted to the control device 38. The camera 51 photographs the openings of the warp T groups opened vertically by the heald frames 17 from one side frame 11 close to the main nozzle 31 on one side of the warp T group toward the other side frame 11 far from the main nozzle 31 on the other side of the warp T group. As shown in fig. 8, the imaging area E2 that the camera 51 can image is an area including the upper warp T group and the lower warp T group on the rear side of the heald frame 17. The shooting timing of the camera 51 is when the reed 16 retreats toward the heald frame 17 side after beating-up.

According to the defective opening detection device 50 of the present embodiment, the same operational advantages as those of embodiment 1 can be achieved, such as the detection of defective opening using 1 camera 51 as in embodiment 1. Further, since the light irradiator 52 does not need the notch 42 as in embodiment 1, the light irradiator 52 can be easily manufactured by comparing with the light irradiator 37 having the notch 42.

The above-described embodiment represents one embodiment of the present invention, and 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.

In the above-described embodiment, the camera image of the aperture projected with the light irradiator as the background is compared with the reference image Ps set in advance to detect the aperture defect, but the present invention is not limited thereto. For example, a predetermined area where no warp yarn is present in a normal state may be determined in advance, and when an opening (warp yarn) projected with the light irradiator as a background is detected in the predetermined area, the opening defect may be detected.

In the first embodiment described above, the light irradiator is provided with a notch that forms a part of the weft passage, but the present invention is not limited to this. The notch is not essential, and a light irradiation device without a notch may be used, and in this case, for example, a light emitting portion having an area smaller than that of the light emitting portion with a notch may be used as long as the flying of the weft is not hindered.

In the above-described embodiments, the camera is provided in one side frame close to the main nozzle, and the light irradiator is provided in the other side frame opposite to the one side frame, but the present invention is not limited thereto. For example, the light irradiator may be provided in one side frame close to the main nozzle, the camera may be provided in the other side frame opposite to the one side frame, and the camera may take an image from the other side toward the one side.

In the above-described embodiments, the light irradiator is turned on in conformity with the imaging timing of the camera, but the present invention is not limited thereto. For example, the light irradiator may be continuously turned on during operation of the loom. In this case, it is not necessary to control the lighting of the light irradiator.

In the above-described embodiment, the camera is a camera that forms a still picture that is photographed at a timing when the reed moves backward toward the heald frame side after beating up, but the camera is not limited to this. The camera may be a video recorder capable of continuously shooting. It is sufficient to perform image analysis by selecting an image when the reed moves back toward the heald frame side after beating up from a captured image captured by a video recorder.

In the above-described embodiments, the description has been given of an example of the application to an air jet loom as a loom, but the application of the shedding failure detection device is not limited to the air jet loom. The shedding failure detection device of the present invention can be applied to, for example, a rapier loom and a water jet loom.

Claims

1. A shedding failure detection device for a loom, comprising:

a camera that photographs the opening of a warp group that is vertically opened by a heald frame, from one side of the warp group toward the other side;

a light irradiator that performs surface light emission that irradiates light toward the camera on the other side of the warp yarn group; and

and a detection unit that detects a defective opening based on a camera image captured by the camera and projected with the light irradiator as a background.

2. The loom shedding failure detection device according to claim 1,

the camera is arranged closer to the reed than the heald frames in the front-back direction of the warp group,

a weft passage allowing passage of a weft is formed on the light irradiator.

3. The shedding failure detection device of a weaving machine according to claim 1 or 2,

the light irradiator lights up in conformity with the shooting opportunity of the camera.