JPH0611459A - Fabric inspection device - Google Patents

Abstract

PURPOSE:To enhance the fabric inspection accuracy through heightening the scan density of a sensor head and inspect a web with good precision even though it consists of a wide or a quickly transported woven fabric. CONSTITUTION:An accommodation box 7 provided in its upper part with a transparent window 8 is installed between a web front W1 and an expansion bar 3. A reflex board 9 is mounted removably on the oversurface of the window 8, and the web W travels in the condition as pinched by the window 8 and reflex board 9. A runner rail 10 is laid at the bottom in the accommodation box 7, and on this rail 10, two sensor heads 13 coupled by a coupling rod 12 are reciprocated by a motor 14, in regular and reverse direction, through a scanning belt 17 at a certain speed in the direction across the width of the web W. The spacing of sensing windows 13a in the sensor heads 13 is set to approx. one half of the web width, and each head 13 inspects the web in a half region as divided into widths.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection device for optically detecting a defect of a woven cloth.

[0002]

2. Description of the Related Art When a woven fabric inspection process is separated from a weaving process to determine the quality of the woven fabric, the quality of the woven fabric can be determined only after the woven fabric is woven. Therefore, even when the warp is threaded through the heddle or the reed, or when the warp is brought in due to the entanglement of the upper and lower warps during the shedding motion, the loom continues to operate until the completion of weaving. The defects in the warp direction continue until the completion of weaving. It is desirable that such defects of the woven fabric be found and repaired early during weaving.

As a method of solving this problem, the applicant of the present application has proposed in Japanese Patent Application No. 3-139145 a probing device which can be installed in a loom to detect defects of a woven cloth in the weaving process. There is.

This inspection device is provided between a cloth fell and an expansion bar, and is provided with a storage box in which a window made of a transparent material is fitted, and a reflection plate installed on the upper surface of the window. There is. Then, the woven woven fabric moves between the storage box and the reflection plate. One sensor head for detecting the defect of the woven cloth is installed inside the storage box, and the sensor head is configured to reciprocate along the traveling rail in the width direction of the woven cloth at a predetermined speed. At that time, the sensor head moves while irradiating the woven cloth with light, and determines the defect of the woven cloth based on the reflected light.

That is, as shown in FIG. 8, a light projector 41 is installed inside the sensor head, and a half mirror 42 is arranged in a passage path of light from the light projector 41. Above the half mirror 42, a convex lens 43 is provided at a predetermined distance H from the woven cloth W, and a spatial filter 44 is provided at a predetermined distance D from the convex lens 43. The light emitted from the projector 41 is reflected by the half mirror 42 and is emitted vertically to the woven cloth W, and reaches the reflection plate 45 arranged on the upper surface (lower surface in the figure) of the woven cloth W from the gap of the warp threads T. And reflect. Then, this reflected light is reflected by the half mirror 4.
After passing through 2, the light passes through the convex lens 43, is focused on the spatial filter 44, and forms an image as brightness.

The spatial filter 44 comprises two comb-shaped filter portions 47 having a large number of light receiving elements 46a and 46b arranged at a constant pitch P in parallel with the warp T direction of the imaged woven fabric W.
It is composed of a and 47b. Double comb filter unit 47
a and 47b convert the received light into an electric signal and output it,
The differential operation circuit 48 obtains the difference between the outputs from the comb filter units 47a and 47b. Then, when the gain of the output frequency f of the output signal based on this difference exceeds a preset value, the determination circuit 49 determines that the woven fabric W has a defect such as warp breakage, and lamp lighting or warning sound generation. A warning is given by an appropriate method such as.

[0007]

By the way, the woven woven fabric gradually moves in the longitudinal direction while being wound by the take-up roller, and the sensor head is woven in comparison with the woven fabric moving in the longitudinal direction. The fabric is scanned by reciprocating in the width direction. As a result, the locus drawn by the irradiation light from the sensor head has a zigzag shape that advances in the longitudinal direction while oscillating in the width direction of the woven fabric. Therefore, the sensor head is moved back and forth sufficiently faster than the moving speed of the woven fabric so that the trajectory of the irradiation light uniformly fills the entire woven fabric detection region, ensuring the entire woven fabric detection region. I was inspected.

However, when a wide woven cloth is inspected over its entire area, the stroke by which the sensor head reciprocates in the width direction of the woven cloth is relatively long, so that the woven cloth is moved by a unit length. The number of reciprocating scans of the sensor head (hereinafter referred to as scan density) is relatively reduced. Further, even when the weaving speed of the woven cloth is high, the sensor head cannot follow the moving speed of the woven cloth, so that the scanning density of the sensor head is relatively lowered. As a result, a region where the irradiation light from the sensor head is not emitted occurs, and defects of the woven fabric may be overlooked when a wide woven fabric or a woven fabric having a high weaving speed is inspected.

As a solution to this problem, it is conceivable to speed up the sensor head to increase the scanning density.
For that purpose, it was necessary to improve the performance of the motor for driving the sensor head so as to support high speed and to add a transmission. As a result, the inspection device is inevitably increased in size and cost. In particular, the increase in size of the device is a problem to be avoided because the inspection device is installed in a relatively narrow space between the cloth fell of the loom and the expansion bar. Therefore,
There is a limit to the speeding up of the sensor head, and it is the current situation that sufficient detection accuracy cannot be obtained for a wide woven fabric or a woven fabric with a high weaving speed.

The present invention has been made in order to solve the above problems, and its purpose is to increase the scanning density of the sensor head to improve the inspection accuracy, and to widen the woven cloth or the weaving speed. An object of the present invention is to provide an inspecting device capable of inspecting a woven cloth with sufficient accuracy.

[0011]

In order to solve the above problems, the present invention is directed to a light-emitting body that moves in the width direction of a woven cloth along a guide member and irradiates light to the inspection area of the woven cloth. A detection unit including a light receiving body that receives the reflected light from the inspection area and converts the light into an electric signal, and a determination unit that determines whether or not there is a defect in the woven fabric based on the electric signal from the light receiving unit. In the inspection device, at least two or more of the detection means are arranged on the guide member.

[0012]

Therefore, according to the present invention, at least two detecting means move in the width direction of the woven fabric along the guide member to scan the woven fabric. In that case, the detection means is at least 2
Since the number of the detecting means installed is one or more, the inspection area of the woven cloth is shared according to the number of the detecting means. Therefore, even for a wide woven fabric or a woven fabric having a high weaving speed, the scanning density in the inspection area is sufficiently high, and the defect of the woven fabric can be reliably detected.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment embodying the present invention will now be described with reference to FIGS.
It will be described with reference to FIG. As shown in FIG. 3, the weft yarn inserted into the opening of the warp yarn T formed by the shedding motion of the heddle frame 1 that constitutes the shedding device is rewound by the reed 2 to the front W of the woven fabric W.
1 is struck and the woven fabric W is formed. The woven cloth W is taken up at a predetermined speed by the take-up action of the press roller 4 and the surface roller 5 which constitute the woven cloth take-up section via the expansion bar 3 at a predetermined speed, and is taken up by the take-up roller 6. Orizen W1 and expansion bar 3
Immediately below the woven cloth passing position between and, a storage box 7 having a length equal to or larger than the width of the woven cloth W is installed such that the longitudinal direction thereof is the width direction of the woven cloth W.

As shown in FIGS. 1 and 2, a window 8 having a length equal to or larger than the width of the woven cloth W is formed in the upper part of the storage box 7.
The plate 8 is made of transparent material such as glass or synthetic resin.
a is fitted. Therefore, the inside of the housing box 7 is shielded from the outside so that dust and cotton dust do not enter. Further, a reflection plate 9 that covers the window 8 is detachably attached to the storage box 7, and the woven cloth W moves while being sandwiched between the window 8 and the reflection plate 9. The lower surface of the reflection plate 9 facing the woven cloth W is mirror-finished.

As shown in FIGS. 1, 2 and 4, a traveling rail 10 having a length equal to or larger than the width of the woven fabric W is laid along the longitudinal direction of the storage box 7 at the bottom of the storage box 7.
Two bases 11 are provided on the traveling rail 10
It is installed so that it can be moved along. An aluminum connecting rod 12 having a length about half the width of the woven cloth W is fitted and fixed to the base 11 by two recesses 12a formed at the bottom thereof. Two sensor heads 13 are installed at both ends of the connecting rod 12 so that the detection windows 13a face outward, and the distance between the detection windows 13a is slightly shorter than half the width of the woven fabric W. ing. Therefore, the two sensor heads 13 are integrated with each other at a predetermined distance via the connecting rod 12 so as to move along the traveling rail 10.

Further, as shown in FIG. 4, the storage box 7
A motor 14 including an AC servomotor is installed at one end of the inside, and a drive pulley 15 is attached to a drive shaft of the motor 14. The motor 14 is driven and controlled by a controller (not shown) to rotate forward and backward. Further, a driven pulley 16 is provided at the other end in the storage box 7,
A scanning belt 17 is wound around the pulleys 15 and 16. The connecting rod 12 is fixed to the scanning belt 17 at the side contacting with the scanning belt 17. In the controller, the connecting rod 12 moves the width center of the woven fabric W as the movement center, and the woven fabric W
Traveling rail 1 with a stroke slightly longer than half the width of
The forward / reverse rotation of the motor 14 is controlled so as to reciprocate along 0. Therefore, the inspection area of the two sensor heads 13 is a half area that divides the woven cloth W into two halves in the width direction except both ends of the woven cloth W, and a part of the boundary is set to overlap.

Further, one end of a signal cable 18 made of an FPC (flexible wiring board) is connected to each sensor head 13 so that the movement of each sensor head 13 can be followed. The other end of each signal cable 18 is connected to a power source and a controller (not shown) so as to supply power to the sensor head 13 and output a detection signal of the sensor head 13 to the controller.

Next, the structure of the sensor head 13 will be described with reference to FIGS. As shown in FIG. 5, inside the case 19 of the sensor head 13, a projector 20 as a light emitter is fixed downward in the front (to the left in the figure).
A half mirror 21 is arranged below the projector 20 in a state of being inclined by 45 degrees with respect to the vertical direction. Further, a mirror 22 is arranged in front of the half mirror 21 in a state of being inclined by 45 degrees in a direction different from the half mirror 21 with respect to the vertical direction. A convex lens 23 is arranged above the mirror 22 while being fitted in the detection window 13a. Further, the convex lens 2 is provided behind the half mirror 21.
4 is arranged, and a spatial filter 25 as a light receiving body of a differential structure is installed behind the convex lens 24.

As shown in FIG. 6, the spatial filter 25 includes a large number of light receiving elements 26 that output electric signals according to the amount of received light.
a and 26b are composed of two comb-shaped filter portions 27a and 27b in which four a and 26b are arranged in parallel at a constant pitch P. The direction of the light receiving elements 26a and 26b is the spatial filter 25.
The direction orthogonal to the moving direction of the woven fabric W imaged on the light receiving surface of the woven fabric, that is, the warp direction T of the image of the woven fabric W (Y in the figure).
Direction). The light projector 20 and the spatial filter 25 are arranged so that no interference occurs.

Each of the comb filter units 27a and 27b converts the received light into an electric signal and outputs it to the differential operation circuit 28,
The differential operation circuit 28 finds the difference between the outputs from the comb filter units 27a and 27b. Then, when the gain of the output frequency f of the output signal based on this difference exceeds a preset value, the determination circuit 29 determines that the woven fabric W has a defect such as warp breakage, and lamp lighting or warning sound generation. A warning is given by an appropriate method such as.

Next, the operation of the inspection device configured as described above will be described. When performing the inspection of the woven cloth W,
As shown in FIGS. 1 and 4, the controller (not shown) is a motor 1.
4 is driven and controlled, and the motor 14 rotates forward and backward. The driving force of the motor 14 is transmitted to the connecting rod 12 via the scanning belt 17 wound around the driving pulley 15 and the driven pulley 16. Then, the connecting rod 12 reciprocates along the traveling rail 10 via the base 11, and accordingly, the two sensor heads 13 installed at both ends of the connecting rod 12 also reciprocate along the traveling rail 10.

At this time, when power is supplied to the two sensor heads 13 from a power source (not shown) through the signal cables 18, the projector 20 emits light inside each sensor head 13, as shown in FIG. The light from the light projector 20 is emitted downward, is reflected in the horizontal direction by the half mirror 21, and is again reflected upward by the mirror 22. Then, the light from the mirror 22 becomes parallel light by the convex lens 23 and is radiated perpendicularly to the woven fabric W from the detection window 13a.

The light applied to the woven cloth W is reflected directly on the back surface of the woven cloth W or through the gap between the warp threads T of the woven cloth W and on the lower surface of the reflection plate 9, and is incident again as reflected light from the detection window 13a. To do. The reflected light passes through the convex lens 23, is reflected in the horizontal direction by the mirror 22, is transmitted through the half mirror 21, is focused by the convex lens 24, and is spatially filtered by the spatial filter 25.
An image is formed as a pattern of the woven cloth W on the light receiving surface of the. Both comb-shaped filter units 27a and 27b convert the imaged light into an electric signal and output it, and the differential operation circuit 28 obtains the difference between the outputs from the comb-shaped filter units 27a and 27b. When the gain of the output frequency f of the output signal based on this difference exceeds a preset value, the determination circuit 29 determines that the woven fabric W has a defect such as warp breakage. Based on this determination, a warning is given by an appropriate method such as lighting a lamp or generating a warning sound.

Thus, the two sensor heads 13 irradiate the woven cloth W with light from the detection windows 13a, and move along the traveling rails 10 in the respective inspection areas of the woven cloth W while detecting the reflected light. To do. At that time, the two sensor heads 13 are installed on the connecting rod 12 such that the distance between the detection windows 13a is slightly shorter than one half of the width of the woven fabric W, and the connecting rod 12 is at the center of the width of the woven fabric W. Is used as the center of movement, and reciprocates with a stroke slightly longer than half the width of the woven fabric W. As a result, each of the sensor heads 13 inspects the halves of the woven cloth W in the width direction, except for both ends of the woven cloth W. That is, FIG.
In the figure, the sensor head 13 on the right side in the figure detects the right half area of the woven cloth W, and the sensor head 13 on the left side in the figure detects the left half area of the woven cloth W. Further, since the inspection area of each sensor head 13 partially overlaps at the boundary portion, the woven fabric W has two sensor heads 1 in the entire area except both end portions.
It is surely checked by 3.

The two sensor heads 13 are woven cloth W.
The sensor head 13 is compared with the conventional inspecting device because it inspects the regions that are divided into left and right in the width direction.
Since each scanning stroke is halved, even if the scanning speed is the same, the scanning density is approximately doubled. As a result, a sufficiently high scanning density can be obtained even for a wide woven cloth W or a woven cloth W having a high weaving speed, so that the inspection accuracy can be significantly improved and the defects of the woven cloth W cannot be overlooked.

Therefore, according to the inspection device of this embodiment, as the connecting rod 12 reciprocates along the traveling rail 10, the two sensor heads 13 installed on the connecting rod 12 are woven cloth W. The halves in the width direction are inspected.

As a result, the scanning density in the inspection area can be increased without increasing the scanning speed of the sensor head 13 even for the wide woven cloth W or the woven cloth W having a high weaving speed, and thus the wide cloth is wide. It is possible to realize a highly accurate inspection even for the woven cloth W and the woven cloth W having a high weaving speed. Further, since the scanning density can be increased, the scanning speed of the sensor head 13 is reduced within a range where the inspection accuracy is secured, so that the drive system such as the motor 14 can be simplified and the inspection device can be downsized. it can.

Since the connecting rod 12 is provided between the two sensor heads 13, the vibration transmitted from the loom and the vibration generated when the sensor head 13 is running are absorbed by the rigid connecting rod 12 made of aluminum. . As a result, erroneous detection of the sensor head 13 due to vibration and the sensor head 1
3 can be prevented. Further, since the two sensor heads 13 are installed so that the respective detection windows 13a face outward, even when the size of the detecting device in the longitudinal direction is limited in relation to the loom, the woven cloth W is It is possible to check up to a nearby place.

Further, according to this inspection device, since the sensor head 13 is not made to operate at high speed, it is difficult for the sensor head 13 to receive an impact due to a change in acceleration when the moving direction is changed due to the forward / reverse rotation of the motor 14. As a result, it is possible to prevent slippage of the scanning belt 17 due to the impact force at the time of direction change, which causes the traveling position of the sensor head 13 to fluctuate, and the sensor head 13 to fail.

Further, since the sensor head 13 is housed in the housing box 7 in which the transparent plate 8a is fitted in the window 8 and is shielded from the outside, dust and cotton wool cannot enter the housing box 7, so that the dust is prevented. It is possible to prevent erroneous detection of the sensor head 13 due to cotton or cotton wool. Further, the woven cloth W has a cleaning effect on the window 8 because it moves while slidingly contacting the window 8 of the storage box 7. Therefore, no dust or cotton wool adheres to the window 8, and the upper surface of the window 8 is always maintained in a clean state, so that erroneous detection of the sensor head 13 due to dust or cotton wool can be prevented.

The present invention is not limited to the above embodiments, but may be configured as follows, for example, within the scope of the invention. (1) In the above embodiment, the vibration from the machine base and the vibration during traveling are absorbed by the rigid connecting rod 12 by interposing the connecting rod 12 between the two sensor heads 13. However, as shown in FIG. Alternatively, each sensor head 13 can be directly installed on each base 11.

(2) In the above-described embodiment, the sensor head 13 provided with each of the light projector 20 and the spatial filter 25 is used as the detection means, and two sensor heads 13 as the detection means are installed to constitute the inspection device. However, the detection means is not limited to the sensor head 13. For example, the detection unit is a detection unit including the light projector 20 and the spatial filter 25, two or more detection units are provided in one case, and a sensor head having two or more detection windows corresponding to the detection unit is provided.
It is also possible to configure the inspection device by installing only one.

(3) In the above embodiment, the sensor head 13
Although two sensor heads 13 are provided, the number of sensor heads 13 is not limited to two and may be three or more depending on the width of the woven fabric W and the weaving speed. In this case, the inspection accuracy can be improved, the scanning speed of the sensor head 13 can be reduced to simplify the drive system such as the motor 14, and the inspection device can be downsized.

(4) In the above-mentioned embodiment, the light receiving member is opposed to the light receiving member 2
Although the spatial filter 25 is composed of the two comb-shaped filter units 27a and 27b, it may be a photoelectric conversion element other than the spatial filter 25 such as a phototransistor or an image sensor.

(5) In the above embodiment, the storage box 7 is installed under the woven fabric W and the woven fabric W is scanned from the lower surface side.
The storage box 7 may be installed above the woven cloth W and the woven cloth W may be scanned from the upper surface side.

(6) In the above embodiment, the inspection device is the cloth fell W1
It is installed between the expansion roller 3 and the expansion bar 3, but the disposition position of the inspection device may be between the press roller 4 and the winding roller 6.

(7) In the above embodiment, the inspection device is the cloth cloth W1
It is installed between the expansion bar 3 and the expansion bar 3 to detect the defect of the woven fabric W in the weaving process, but the inspection device may be used alone in the inspection process after the weaving process.

(8) In the above embodiment, the two sensor heads 13 are installed on the traveling rail 10 so that the detection windows 13a face each other, but the directions of the detection windows 13a may be set appropriately.

(9) In the above embodiment, each comb filter unit 2
4 of the light receiving elements 26a and 26b formed on 7a and 27b.
Although the spatial filter 25 is formed as a pair, the number of pairs of the light receiving elements 26a and 26b forming the spatial filter 25 can be set appropriately.

(10) In the above embodiment, the reflection plate 9 is arranged above the window 8 of the storage box 7, but the reflection plate 9 may not be arranged. In this case, the defect of the woven cloth W can be determined by detecting the light reflected on the back surface of the woven cloth W.

[0041]

As described above in detail, according to the present invention, the scanning density of the sensor head is increased to improve the detection accuracy, and it is sufficient for a wide woven fabric and a woven fabric with a high weaving speed. It has an excellent effect that it can be detected with high precision.

[Brief description of drawings]

FIG. 1 is a perspective view of an inspection device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 in the inspection device according to the embodiment.

FIG. 3 is a perspective view showing an inspection device installed in a loom according to an embodiment.

FIG. 4 is an exploded perspective view of a main part of the inspection device in one embodiment.

FIG. 5 is a partially cutaway perspective view of a sensor head in one embodiment.

FIG. 6 is a front view of a spatial filter arranged in a sensor head according to an embodiment.

FIG. 7 is an exploded perspective view of a main part of a detection device according to another example.

FIG. 8 is a principle diagram of the inspection in the conventional inspection device.

[Explanation of symbols]

10 ... Running rail as guide member, 13 ... Sensor head as detecting means, 20 ... Projector as light emitting body, 2
5 ... Spatial filter as photoreceptor, 28 ... Operation calculation circuit as judging means, 29 ... Judging circuit as judging means, W
… Woven cloth.

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[Procedure amendment]

[Submission date] January 14, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsuhisa Ando 2-chome, Toyota-cho, Kariya city, Aichi stock company Toyota Industries Corp.

Claims (1)

[Claims] 1. A light-emitting body that moves in the width direction of the woven cloth along a guide member and irradiates light to an inspection area of the woven cloth,
A detection unit including a light receiving body that receives the reflected light from the inspection area and converts the light into an electric signal, and a determination unit that determines whether or not there is a defect in the woven fabric based on the electric signal from the light receiving unit. The inspection device, wherein at least two or more of the detection means are arranged on the guide member.