JPH111867A - Fabric inspection device for woven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fabric, inspection device capable of reducing the lowering of the detection accuracy, caused by flapping of a woven fabric and vibration of a sensor head by installing a means for keeping the distance between the sensor head and the woven fabric constant. SOLUTION: This fabric inspection device has a pressing and contacting body 20 fixed to a base plate 19 of a sensor head 14 reciprocally moving along a rail 11, and having a light projector 22, an image-forming lens 23 and a photodetector 24, attached thereto. The detecting region 241 on the woven fabric W is imaged on the photodetector 24 by the image-forming lens 23. Frictional resistance-inhibiting parts 205 of the pressing and contacting body 20 is pressed to the upper surface of the woven fabric W at the right and left of the detecting region 241 so as to keeping contact with the woven fabric W in the traveling direction of the sensor head 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a sensor head which moves while picking up light reflecting the weaving state of a woven fabric among light projected on a woven fabric from a light projecting means, and a light receiving amount of the light. The present invention relates to a woven cloth inspection device that detects a defect in a woven cloth using a photoelectric sensor that outputs an electric signal corresponding to the woven cloth.

[0002]

2. Description of the Related Art As disclosed in Japanese Unexamined Patent Publication No. 2-160957, a fixed-type woven fabric inspection device comprising a light projecting means and a light receiving means immovably arranged over the entire woven width of a woven fabric, and a woven fabric. There is a scanning woven cloth inspection device that moves a light projecting unit and a light receiving unit in a weaving width direction. The light projecting means projects light onto the surface of the woven fabric, and the light reflecting the weaving state of the woven fabric is received by the light receiving means. In this case, when the distance between the woven fabric surface and the light receiving means or the light emitting means fluctuates due to the flutter of the woven fabric due to the vibration unique to the loom or the vibration of the light emitting / receiving means, the light receiving intensity in the light receiving means changes.
Such a change in the received light intensity lowers the inspection accuracy.

In the fixed-type cloth inspection apparatus disclosed in Japanese Patent Application Laid-Open No. 2-160957, an edge of a cover for covering a light receiving means composed of a line sensor is pressed against a woven cloth surface. The variation in distance between the cloth surface and the light receiving means is suppressed.

[0004]

However, a cover having a length extending over the entire weaving width of the woven fabric is separate from a line sensor having a length also extending over the entire weaving width of the woven fabric. Irrespective of the loom, it bends and vibrates due to the vibration inherent in the loom. Therefore, the fluttering of the woven fabric does not coincide with the bending vibration of the line sensor, and the distance between the woven fabric surface and the light receiving means varies. Also, if the cover is brought into contact with the entire weaving width, there is a risk that the woven fabric will take up resistance and that foreign matter such as fly cotton will accumulate on the contact portion.

[0005] Japanese Patent Application Laid-Open No. 8-201311 discloses a woven cloth inspection device that runs on a woven cloth surface. This woven cloth inspection device is provided with four wheels for running the woven cloth surface, and the wheels are pressed against the woven cloth surface. It seems that the distance between the woven fabric surface immediately below the running body and the light emitter and light receiving element in the running body is likely to be constant, but only the vicinity of the woven fabric surface that is in contact with the wheels is partially pushed down, so the light from the floodlight hits Vibration at the woven fabric surface cannot be suppressed. For this reason, the distance between the woven fabric surface portion to which the light is projected and the projector and the light receiving element is not constant, and the detection accuracy is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to avoid a decrease in inspection accuracy due to fluttering of a woven fabric and vibration of a sensor head.

[0007]

For this purpose, the present invention comprises a sensor head which moves while picking up light reflecting the weaving state of the woven fabric among the light projected from the light emitting means onto the woven fabric, The present invention is directed to a woven cloth inspection device that detects a defect of a woven cloth using a photoelectric sensor that outputs an electric signal corresponding to an amount of received light, and in the invention according to claim 1, the illuminating means is provided on the sensor head. A woven fabric having distance defining means for invariably defining a distance between a substantial light projecting position and a detection range on a woven cloth and a distance between a substantial light receiving position of the photoelectric sensor on the sensor head and the detection range. A cloth inspection device was constructed.

[0008] The configuration in which the distance between the substantial light projecting position and the detection range on the woven fabric and the distance between the substantial light receiving position and the detection range are invariable is caused by the influence of vibration peculiar to the loom. Eliminates changes in light receiving intensity in the photoelectric sensor.

According to the second aspect of the present invention, the sensor head is supported by a rail parallel to the woven fabric surface, and the light projecting position and the light receiving position are set to be invariable with respect to the rail.
When the rail vibrates, the light projecting position and the light receiving position vibrate integrally with the rail, but the distance defining means makes the distance between the detection range and the light projecting position and the light receiving position unchanged.

In a third aspect of the present invention, a pressing contact body provided on the sensor head so as to press a woven fabric surface around the detection range is used as the distance defining means. The pressing contact body presses the woven fabric around the detection range, and the pressing action also regulates the detection range to a contact height position between the pressing contact body and the woven fabric surface.

According to a fourth aspect of the present invention, the sensor head is advanced in a direction intersecting with the yarn direction of the warp, and the pressing contact body is pressed against the woven fabric surface on the left and right sides of the detection range with respect to the advancing direction of the sensor head. I let it.

The configuration in which the left and right woven fabric surfaces in the direction in which the sensor head travels is pressed by the pressing contact body is suitable for the constant holding of the distance by the pressing action of the pressing contact body. In the invention of claim 5, the pressing contact body is brought into pressure contact with the surface of the woven fabric all around the detection range.

The configuration in which the entire periphery of the detection range is pressed by the pressing contact body is optimal for the constant holding of the distance by the pressing action of the pressing contact body. In the invention of claim 6, the contact portion of the pressing contact body with the woven fabric surface is provided with a rub resistance suppressing means.

The presence of the abrasion resistance suppressing means reduces the abrasion resistance between the woven fabric and the pressing contact body, and ensures smooth running of the sensor head.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is embodied in a cloth inspection apparatus on a loom will be described below with reference to FIGS.

As shown in FIG. 1, a rail 11 and an endless belt 12 are arranged above the woven fabric W in the width direction of the woven fabric W, that is, in the direction of the weft Y (shown in FIG. 4). I have. The endless belt 12 is stretched around a driving pulley 15 of a stepping motor 13 shown in FIG. 3 and a guide pulley 16 shown in FIG. The endless belt 12 is a stepping motor 1
By the reciprocating drive of No. 3, it reciprocates. A slider 17 is supported on the rail 11, and a suspension bracket 18 is fixed to the slider 17. The sensor head 14 is fixed to the suspension bracket 18. Sensor head 1
4 is mounted on the rail 11 via a suspension bracket 18 and a slider 17. Substrate 19 of sensor head 14
Is fixed to the endless belt 12, and the sensor head 1
4 reciprocates along the rail 11 by reciprocating the endless belt 12.

A pressing contact 20 and a signal processing / discriminating circuit board 25 are fixed to a board 19 of the sensor head 14. A support cylinder 21, a projector 22, and a light receiving element 24 serving as a photoelectric sensor are fixed to the pressing contact body 20, and an imaging lens 23 is fixed in the support cylinder 21.

A detection range 241 shown in FIG. 4 represents a range on the woven fabric W where an image is formed on the light receiving element 24 by the imaging lens 23. The width of the detection range 241 in the yarn direction of the weft Y is smaller than the yarn arrangement pitch of the warp T. Further, the length of the detection range 241 in the yarn direction of the warp T is set to a length including, for example, about 10 wefts Y. The light projection direction of the light emitted from the light projector 22 is a direction inclined with respect to the woven fabric W so as to face the detection range 241 and to face the yarn direction of the weft Y on the woven fabric W. The area surrounded by the right arrow Q1 represents the scanning range of the detection range 241 on the woven fabric W due to the rightward movement of the sensor head 14. An area surrounded by a left arrow Q2 indicates a scanning range of the detection range 241 on the woven fabric W due to the leftward movement of the sensor head 14. The woven fabric W moves in the direction of arrow R.

The light receiving element 24 converts the received light into a current. The light receiving element 24 outputs the converted current signal to the signal processing / discriminating circuit board 25. The signal processing-discriminating circuit board 25 processes the converted current signal and, based on the processed signal information, detects the defect of the warp T. Determine the presence or absence. The determination result indicating that there is a warp defect is transmitted to a loom control device (not shown) via a transmitting unit (not shown), and the loom control device stops weaving based on the transmission of the determination result.

The pressing contact body 20 includes an upper wall 201 on which the light projector 22 and the light receiving element 24 are mounted, hanging walls 202 and 203 hanging from both front and rear ends of the upper wall 201, and a hanging wall 20.
2, 203 are formed by warping at the lower ends of the abrasion resistance suppressing portions 204 and 205. The abrasion resistance suppressing portions 204 and 205 of the pressing contact body 20 are pressed against the upper surface of the woven fabric W on the left and right sides of the detection range 241 with respect to the traveling direction of the sensor head 14 in the direction crossing the warp T. The edges 206 and 207 of the abrasion resistance suppressing sections 204 and 205 are
Oblique to the direction of travel. Scratch resistance suppressor 20
Reference numerals 4 and 205 slide on the upper surface of the woven fabric W as the sensor head 14 moves. The length of the abrasion resistance suppressing sections 204 and 205 in the yarn direction of the weft Y is longer than the length of the detection range 241 in the yarn direction of the weft Y. The area between the rub resistance suppressing section 204 and the rub resistance suppressing section 205 includes the detection range 241, and the detection range 241 is located at the center of the area.

In the first embodiment, the following effects can be obtained. (1-1) The light projecting position of the light projector 22 which is the light projecting means shown in FIG. 1 is a substantial light projecting position on the sensor head 14, and the light receiving position of the light receiving element 24 which is the photoelectric sensor shown in FIG. This is a substantial light receiving position on the head 14. Although the woven fabric W flaps or the rail 11 vibrates due to the vibration unique to the loom, the rubbing resistance suppressing portions 204 and 205 of the pressing contact body 20 pressed against the upper surface of the woven fabric W
Never leave the upper surface of the The woven fabric W in the entire area immediately below the pressing contact body 20 serving as the distance defining means is provided on the left and right with respect to the traveling direction of the sensor head 14 in the abrasion resistance suppressing sections 204 and 205.
Of the warp T is pressed down equally by the pressing action against the tension of the warp T. Therefore, the detection range 241 and the projector 2
2 and the distance between the detection range 241 and the light receiving element 24 are constant irrespective of the fluttering of the woven fabric W and the vibration of the rail 11. The configuration in which the distance between the detection range 241 and the light projector 22 and the distance between the detection range 241 and the light receiving element 24 are invariable eliminates a change in the received light intensity of the photoelectric sensor due to the influence of vibration peculiar to the loom, and the accuracy of the detection accuracy. Is improved. (1-2) The vibration amount of the rail 11 increases as the weaving width of the woven fabric W increases, but this vibration amount is larger than the fluttering of the woven fabric W. The projector 22 and the light receiving element 24 are the rail 11
Vibrates integrally, but the pressing action of the pressing contact body 20 that mainly resists the tension of the warp T is detected by the detection range 241 and the light projector 2.
2 and the distance between the detection range 241 and the light receiving element 24 are not changed. (1-3) The rubbing resistance suppressing sections 204 and 205 are arranged on the left and right sides of the detection range 241 with respect to the traveling direction of the sensor head
Press down. Since the height position of the woven fabric surface is mainly maintained by the tension of the warp T, the warp portion which is pushed down at the contact portion with the abrasion resistance suppressing portions 204 and 205 is moved. Woven fabric surface is pressed down equally. The configuration in which the pressing contact body 20 presses the front and rear woven fabric W surfaces in the direction in which the sensor head 14 moves is suitable for the constant holding of the distance by the pressing action of the moving pressing contact body 20. (1-4) Scratch resistance suppressing section 20 which is a means for suppressing abrasion resistance
4,205 exists in the woven fabric W in the traveling direction of the woven fabric W.
Frictional resistance between the contact member and the pressing contact body 20 is reduced. Further, the shapes of the edges 206 and 207 reduce abrasion resistance between the woven fabric W and the pressing contact body 20 in the traveling direction of the sensor head 14. Therefore, smooth running of the sensor head 14 is guaranteed. The smooth running of the sensor head 14 is important for improving the inspection accuracy. (1-5) The detection range 241, the light projector 22, and the light reception are performed only by pressing the pressing contact body 20 against the woven fabric W so that the woven fabric W does not flutter and the vibration of the rail 11 causes the woven fabric W to separate from the pressing contact body 20. The distance to the stop 24 is defined to a desired value. Therefore, as compared with the conventional device which required precise gap adjustment between the sensor head and the woven fabric surface, the sensor head
The height position of the sensor head can be easily adjusted, and the mounting work of the sensor head 14 can be performed in a short time. (1-6) When the pressing contact body 20 is not provided, the imaging lens 2 is taken into consideration in consideration of the fluttering of the woven fabric W and the influence of the vibration of the rail 11.
It is necessary to use a lens having a large depth of focus, that is, a lens having a large focal length, but such a lens becomes large. In the present embodiment, in which the influence of the flutter of the woven fabric W and the vibration of the rail 11 need not be considered, it is not necessary to increase the depth of focus of the imaging lens 23. Therefore, a lens having a small focal length is sufficient, and the entire sensor head 14 can be reduced in size.

Next, a second embodiment shown in FIGS. 5 and 6 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. In this embodiment, the pressing contact body 26 has a bowl shape having an opening only at the lower portion, and a pressing ring 262 is integrally formed around the entire lower end of the hanging wall 261. The pressing ring 262 presses the entire circumference of the detection range 241, and the distance between the detection range 241 and the light projector 22 and the light receiving element 24 is fixed. The board 19 is composed of a pair of hanging brackets 1.
8 is attached to the slider 17.

The cross-sectional shape of the holding ring 262 is substantially circular, and the holding ring 262 serving as a means for suppressing abrasion resistance is
The frictional resistance between the contact body and the pressing contact body 26 is effectively suppressed. Next, a third embodiment shown in FIGS. 7 and 8 will be described. First
The same reference numerals are given to the same components as in the embodiment.

In this embodiment, the hanging walls 281 and 282 of the pressing contact body 28 are closer to each other toward the lower side, and the lower ends of the hanging walls 281 and 282 are integrally connected by a lower wall 283. The outer surface of the connection between the lower wall 283 and the hanging walls 281 and 282 is a curved surface. A detection hole 284 is provided through the lower wall 283, and the detection range 241 is defined by the detection hole 28.
4. The lower wall 283 presses against the upper surface of the woven fabric W, and the woven fabric W around the detection range 241 is pushed down by the lower wall 283.

The curved outer surface of the connecting portion between the lower wall 283 and the hanging walls 281 and 282 reduces abrasion resistance between the pressing contact body 28 and the woven fabric W. Further, since the entire circumference of the detection range 241 is pushed down by the lower wall 283, the distance between the detection range 241 and the light emitting device 22 and the distance between the detection range 241 and the light receiving element 24 are determined by the fluttering of the woven fabric W and the vibration of the rail 11. Is constant irrespective of.

Next, a fourth embodiment shown in FIGS. 9 and 10 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. Pressing contact body 3 in this embodiment
Reference numeral 3 denotes a hollow body, and a detection hole 332 is provided through a lower wall 331 of the pressing contact body 33. The lower wall 331 is pressed against the upper surface of the woven fabric W, and the detection range 241 is disposed in the detection hole 332. A suction pipe 34 is connected to the pressing contact body 33, and the suction pipe 34 is connected to a suction device (not shown). The height position of the lower surface of the lower wall 331 is set at the height position of the woven fabric W when weaving is stopped. During weaving, the inside of the pressing contact body 33 becomes negative pressure by the operation of the suction device.
Due to this negative pressure action, the woven fabric W immediately below the lower wall 331 is moved to the lower wall 3.
31 is adsorbed to the lower surface. Accordingly, the distance between the detection range 241 and the light projector 22 and the distance between the detection range 241 and the light receiving element 24 are constant irrespective of the fluttering of the woven fabric W and the vibration of the rail 11. Further, the suction action of the suction pipe 34 constituting the distance defining means prevents the fly waste from adhering to the detection range 241. Adhering of fly waste to the detection range 241 is one of the causes for lowering the inspection accuracy.

Next, a fifth embodiment shown in FIG. 11 will be described. The same components as those in the first embodiment are denoted by the same reference numerals. The sensor head 35 of this embodiment includes a pair of reflecting mirrors 36 and 37 and a condenser lens 38. A light projector 39 is provided outside the traveling path of the sensor head 35. The light projector 39 emits parallel light parallel to the traveling path of the sensor head 35 to the reflecting mirror 36, and the reflecting mirror 36 reflects the parallel light toward the detection range 40 on the woven fabric W. Part of the light reflected and scattered from the detection range 40 goes to the condenser lens 38. The condenser lens 38 converges the reflected scattered light from the detection range 40 into parallel light, and the parallel light is reflected by the reflector 37 toward the condenser lens 42 in the light receiver 41 outside the travel path of the sensor head 35. You. The condensing lens 42 condenses the light reflected from the reflecting mirror 37 on a light receiving element 43 in the light receiver 41.

In this embodiment, the reflecting mirror 36 serves as a substantial light emitting position of the light projector 39 in the sensor head 35, and the condenser lens 38 serves as a substantial light receiving position of the light receiving element 43. The distance between the detection range 40 and the reflecting mirror 36, and the distance between the detection range 40 and the condenser lens 38 are determined as follows:
It becomes constant irrespective of the vibration of the rail 11 and the light receiving element 43
Is not affected by the fluttering of the woven fabric W and the vibration of the rail 11.

[0029]

As described above in detail, according to the present invention, the distance between the substantial light projecting position on the sensor head of the light projecting means and the detection range on the woven fabric and the substantial distance of the photoelectric sensor on the sensor head are reduced. Since the distance between the light receiving position and the detection range is defined invariably, there is an excellent effect that it is possible to avoid the fluttering of the woven fabric and the deterioration of the inspection accuracy due to the vibration of the sensor head.

[Brief description of the drawings]

FIG. 1 is a partially omitted front view showing a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a schematic plan view.

FIG. 5 is a main part front view showing the second embodiment.

FIG. 6 is a sectional view taken along line CC of FIG. 5;

FIG. 7 is an essential part front view showing a third embodiment.

FIG. 8 is a sectional view taken along line DD of FIG. 7;

FIG. 9 is a main part front view showing the fourth embodiment.

FIG. 10 is a sectional view taken along line FF of FIG. 9;

FIG. 11 is a partially omitted front view showing a fifth embodiment.

[Explanation of symbols]

14, 35 ... sensor head, 20, 26, 28, 33 ...
Pressing contact bodies serving as distance defining means, 204, 205: rubbing resistance suppressing section serving as rubbing resistance suppressing means, 22: light projector serving as light emitting means, 24 ... light receiving element serving as photoelectric sensor, 262
... A press ring serving as a scratch resistance suppressing means, and 34.

Claims (6)

[Claims] A sensor head that moves while picking up light reflecting the weaving state of the woven fabric among the light projected onto the woven fabric from the light projecting means, and outputs an electric signal corresponding to an amount of received light. In a woven cloth inspection device for detecting a defect of a woven cloth using an output photoelectric sensor, the distance between a substantial light emitting position of the light emitting means on the sensor head and a detection range on the woven cloth and the photoelectric A woven cloth inspection device comprising distance defining means for invariably defining a distance between a substantial light receiving position of the sensor on the sensor head and the detection range. 2. The sensor head according to claim 1, wherein the sensor head is supported on a rail parallel to a woven fabric surface, and the light projecting position and the light receiving position are set to be invariable with respect to the rail. Woven cloth inspection equipment. 3. The sensor according to claim 1, wherein the distance defining means is a pressing contact body provided on the sensor head so as to press a woven fabric surface around the detection range.
Item 13. The woven cloth inspection device according to Item 1. 4. The sensor head proceeds in a direction intersecting with the yarn direction of the warp, and the pressing contact body presses and contacts the woven fabric surface on the left and right sides of the detection range with respect to the traveling direction of the sensor head. 2. The woven cloth inspection device according to 1. 5. The woven cloth inspection device according to claim 3, wherein the pressing contact body is in pressure contact with the woven cloth surface all around the detection range. 6. The woven cloth inspection device according to claim 3, wherein a rubbing resistance suppressing means is provided at a contact portion of the pressing contact body with the woven cloth surface.