JP3820316B2 - Weaving cloth inspection device in loom - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a sensor head that moves while picking up light reflecting the weaving state of a woven fabric on a loom, and uses a photoelectric sensor that outputs an electrical signal corresponding to the amount of received light to check whether or not there is a defect in the woven fabric. The present invention relates to a woven fabric inspection apparatus in a loom for detecting the above.
[0002]
[Prior art]
In this type of woven fabric inspection apparatus, when disturbance light is picked up by a photoelectric sensor, the accuracy of detecting the presence or absence of defects is lowered. Therefore, for example, in the conventional apparatus disclosed in Japanese Patent Laid-Open No. 6-65844, the sensor head is accommodated in the accommodation box in order to eliminate the influence of disturbance light as much as possible. The sensor head is supported on the traveling rail via a slidable base. The sensor head supported so as to be movable on the traveling rail is fixed to a belt that is reciprocated by a motor, and the sensor head reciprocates by the reciprocating operation of the motor.
[0003]
[Problems to be solved by the invention]
Warp yarns are passed in units of a certain number between adjacent wings, but for example, the number of warp threads in one cocoon wing is insufficient, and the number of warp knives between adjacent wings is more than specified. A situation may arise. When such a situation continues, so-called warps are generated on the woven fabric, and a defective woven fabric is produced. When such a defect on the woven fabric is detected, weaving is stopped to prevent the generation of warps. In this case, accurate detection of the warp is important in preventing the increase of the warp and avoiding the deterioration of the woven fabric quality, or avoiding the decrease in the operation rate due to the false detection. Smooth running of the sensor head is necessary to accurately find the defects. If the motor breaks down or if fluff enters between the base and the running rail, the sensor head cannot run smoothly. However, in the housing configuration in which the sensor head is housed in the housing box, the traveling state of the sensor head cannot be grasped.
[0004]
An object of the present invention is to provide a woven fabric inspection apparatus that can grasp the traveling state of a sensor head.
[0005]
[Means for Solving the Problems]
For this purpose, the present invention includes a sensor head that moves while picking up light reflecting the weaving state of the woven fabric on the loom and a cover that covers the scanning path of the sensor head, and outputs an electrical signal corresponding to the amount of light received. The present invention is directed to a woven fabric inspection apparatus that detects the presence or absence of defects in a woven fabric using a photoelectric sensor, and in the invention of claim 1, a lighting display means that moves and moves together with the sensor head, and the lighting A woven fabric inspection apparatus comprising a leakage means for leaking the lighting light of the display means to the outside of the cover is configured to light up the lighting display means when scanning the sensor head.
[0006]
The lighting light of the lighting display means can be visually recognized from outside the cover through the leakage means. The movement status of the sensor head covered with the cover can be grasped based on the movement status of the lighting light.
[0007]
Further, the gap between the cover and the fabric surface was the leak means.
The gap is convenient as a leakage means.
[0008]
According to a second aspect of the present invention, in the first aspect , the lighting display means projects light onto the woven cloth surface outside the cover from the gap.
The reflected light from the woven fabric surface is convenient for grasping the traveling state of the sensor head in the cover.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0011]
As shown in FIG. 1, a support bar 10 is disposed above the woven fabric W in the woven width direction of the woven fabric W, that is, the weft yarn direction. A rail 11, an inspection motor 13, a guide pulley 16 and an optical receiver 40 are attached to the support bar 10. A drive pulley 15 is fixed to the output shaft of the inspection motor 13, and an endless belt 12 is wound around the drive pulley 15 and the guide pulley 16. The endless belt 12 reciprocates by the reciprocating drive of the inspection motor 13. As shown in FIGS. 2 and 3, the sensor head 14 is slidably supported on the rail 11, and the sensor head 14 is fixed to the endless belt 12. The sensor head 14 reciprocates along the scanning path along the rail 11 by the reciprocating rotation of the endless belt 12. The inspection motor 13, the pulleys 15 and 16, the endless belt 12 and the rail 11 constitute reciprocating means. The sensor head 14, the inspection motor 13, the pulleys 15 and 16, the endless belt 12, and the support bar 10 are covered with a cover 41, and the cover 41 covers the scanning path of the sensor head 14.
[0012]
The sensor head 14 includes a light projector 17, an imaging lens 18, a pair of light receiving elements 19 and 20 serving as a photoelectric sensor, a signal processing circuit board 21, an optical transmitter 22, and a lighting device 25. The lighting device 25 is directed on the surface of the woven fabric W through a gap 412 between the hanging portion 411 of the cover 41 and the woven fabric W, and the projection light from the lighting device 25 is outside the cover 41 and the woven fabric W. Reflect from the surface. That is, the projection light from the lighting device 25 is reflected on the woven fabric W surface on the opposite side of the woven fabric W from the pre-woven W1 with the cover 41 interposed therebetween. The light projected from the projector 17 is directed onto the woven fabric W. The imaging lens 18 forms an image of the upper surface of the woven fabric W on a plane coinciding with the light receiving surfaces of the pair of light receiving elements 19 and 20. The light receiving elements 19 and 20 have a narrow width in the yarn arrangement direction of the warp T and a long shape in the yarn direction of the warp T.
[0013]
A detection range 191 in FIG. 5 represents a range on the woven fabric W imaged on the light receiving element 19 by the imaging lens 18, and a detection range 201 is a woven fabric imaged on the light receiving element 20 by the imaging lens 18. Represents the range on W. The widths of the detection ranges 191 and 201 in the yarn arrangement direction of the warp T are the same h, and the width h is smaller than half P / 2 of the yarn arrangement pitch P of the warp T. The lengths of the warp yarns T in the detection ranges 191 and 201 are the same, and the length is set to include about ten wefts Y, for example. Both detection ranges 191 and 201 are shifted by half the yarn arrangement pitch P in the yarn arrangement direction of the warp T.
[0014]
A region surrounded by a rightward arrow Q1 in FIG. 4 represents a scanning range of the detection ranges 191 and 201 on the woven fabric W due to the movement of the sensor head 14 in the right direction. A region surrounded by a left-pointing arrow Q2 represents a scanning range of the detection ranges 191 and 201 on the woven fabric W due to the movement of the sensor head 14 in the left direction. That is, at the time of inspection, the projection light from the projector 17 on the sensor head 14 scans within the woven width W1 of the woven fabric W. The woven fabric W moves in the direction of arrow R.
[0015]
The light receiving elements 19 and 20 convert the received light into a current. This converted current signal is an electrical signal corresponding to the amount of received light. The circuit in FIG. 5 represents a circuit configuration on the signal processing circuit board 21. The light receiving element 19 outputs the conversion current signal to the current-voltage conversion circuit 28, and the light receiving element 20 outputs the conversion current signal to the current-voltage conversion circuit 29. The current-voltage conversion circuits 28 and 29 convert the converted current signal into voltage signals S 1 and S 2 and output them to the difference calculation circuit 30. A waveform S1 in FIG. 6 represents a voltage signal output from the current-voltage conversion circuit 28, and a waveform S2 represents a voltage signal output from the current-voltage conversion circuit 29. Note that the fluctuations in the values of the voltage signals S1 and S2 are as small as about 5 millivolts for an output voltage of 1 volt, for example.
[0016]
The difference calculation circuit 30 calculates the difference between the values of the voltage signals S1 and S2 input from the current-voltage conversion circuits 28 and 29. A waveform ΔS in FIG. 6 represents a difference signal output from the difference calculation circuit 30. The difference calculation circuit 30 outputs the difference signal ΔS obtained by the calculation to the comparison circuit 32 via the band pass filter 31. The band pass filter 31 cuts a waveform signal other than a signal having a frequency near the frequency of the difference signal ΔS.
[0017]
The comparison circuit 32 compares the input difference signal ΔS with the reference value Vo (> 0) preset by the reference value setting circuit 33. When the value of the difference signal ΔS exceeds the reference value Vo, the comparison circuit 32 outputs a signal indicated by a waveform H in FIG. The control signal generation circuit 34 outputs a control signal K shown in a pulse waveform in FIG. The counter 35 measures the time interval tx between the control signals K based on the number of pulse signals output from the reference clock 36. This measurement information is sent to the comparison circuit 37.
[0018]
The comparison circuit 37 compares the reference interval [to-Δt, to + Δt] preset by the reference value setting circuit 38 with the measured time interval tx. If tx is outside the range of [to−Δt, to + Δt], the comparison circuit 37 outputs an abnormality detection signal to the output circuit 39. If tx is within the range of [to−Δt, to + Δt], the comparison circuit 37 does not output an abnormality detection signal to the output circuit 39. The output circuit 39 outputs a defect presence detection signal to the optical transmitter 22 in response to the input of the abnormality detection signal output from the comparison circuit 37. The optical transmitter 22 converts this defect detection signal into light and transmits it to the optical receiver 40.
[0019]
If the moving speed of the sensor head 14 is v and the magnification of the imaging lens 18 is m, the image combined on the light receiving planes of the light receiving elements 19 and 20 by the imaging lens 18 moves at a speed mv. The detection ranges 191 and 201 having a width h smaller than the yarn arrangement pitch P of the warp T are shifted in the arrangement direction of the warp T by half P / 2 of the yarn arrangement pitch P. Therefore, if the yarn arrangement pitch of the warp T is always equal to the predetermined yarn arrangement pitch P, the time interval tx of the control signal K is substantially equal to P / mv. P / mv is adopted as the reference value to, and Δt is an allowable tolerance.
[0020]
The defect presence / absence determining means including the comparison circuit 32, the reference value setting circuit 33, the control signal generation circuit 34, the counter 35, the reference clock 36, the reference value setting circuit 38 and the comparison circuit 37 is calculated by the difference calculation circuit 30. The presence / absence of a defect is determined based on the difference ΔS. The calculation of the difference ΔS suppresses changes in the electrical signal due to the influence of disturbances such as illumination light and fluff.
[0021]
In FIG. 6, a region Wt1 in the weaving width direction of the woven fabric W represents a rough portion due to the occurrence of a warp and a region Wt2 represents a dense portion due to the occurrence of a warp. The width h in the yarn arrangement direction of the warp T of the detection ranges 191 and 201 of the light receiving elements 19 and 20 is set to be equal to or less than the yarn arrangement pitch P of the warp T, and both detection ranges 191 and 201 are arranged in the yarn arrangement pitch in the yarn arrangement direction. It is shifted by P / 2 half P / 2. Since the width of the detection range 191, 201 of each light receiving element 19, 20 is equal to or less than the yarn arrangement pitch P, the value of the electric signal obtained when one of the detection ranges 191, 201 is on the arrangement position of the warp T, The difference from the value of the electric signal obtained when the other is between the arrangement positions of adjacent warps T is the largest. Therefore, the difference ΔS between the values of the electric signals S1 and S2 is maximized by shifting both the detection ranges 191 and 201 in the moving direction of the detection ranges 191 and 201 by half P / 2 of the yarn arrangement pitch P. The larger the difference ΔS, the more accurate the determination of the presence or absence of defects.
[0022]
As shown in FIG. 5, the inspection motor 13 and the projector 17 are controlled by a loom control computer Co that controls the operation of the loom drive motor M. The loom control computer Co performs feedback control of the reciprocating operation of the inspection motor 13 based on a preset scanning program and rotational position information from a rotary encoder (not shown) incorporated in the inspection motor 13. At the time of inspection, the loom control computer Co commands the lighting of the projector 17, and the projector 17 is turned on when the sensor head 14 is scanned. The lighting device 25 is always on when the loom is powered on. The optical receiver 40 receives communication light including a defect presence detection signal transmitted from the optical transmitter 22. The optical receiver 40 converts the received defect detection signal into an electrical defect detection signal and outputs it to the loom control computer Co. The loom control computer Co commands the loom driving motor M and the inspection motor 13 to stop operating based on the input of the defect presence detection signal, and commands the projector 17 to turn off. When the start switch 26 is turned on, the loom control computer Co commands the operation of the loom drive motor M and the cloth inspection motor 13 and also commands the lighting of the projector 17 to start weaving and cloth inspection.
[0023]
The following effects can be obtained in the first embodiment.
(1-1) Detection of the presence / absence of a defect is performed based on measurement of a time interval tx (= P / mv) between the control signals K, and the detection accuracy (examination accuracy) of the presence / absence of a defect is determined by the movement of the sensor head 14. Influenced by speed V. For this reason, when the sensor head 14 does not travel smoothly due to a failure of the inspection motor 13 or biting between the rail 11 and the sensor head 14, the accuracy of inspection decreases. The movement status of the sensor head 14 covered with the cover 41 can be grasped based on the movement status of the lighting light of the lighting device 25 which is the lighting display means. That is, the sensor head 14 is in a stopped state due to a failure of the inspection motor 13, and a decrease in the moving speed of the sensor head 14 due to the biting of the fluff can be grasped based on the moving state of the lighting light of the lighting device 25. Such a grasp makes it possible to cope with the elimination of the obstruction of the smooth running of the sensor head 14 due to the failure of the inspection motor 13 or the biting of the fluff.
(1-2) If the lighting light of the lighting device 25 is leaked from the gap 412 to the outside, the traveling state of the sensor head 14 can be grasped, and the gap 412 is simple as a leakage means.
(1-3) The projection light from the lighting device 25 can be easily visually recognized by reflection from the woven cloth W surface outside the cover 41. The configuration in which the projection light from the lighting device 25 is reflected by the woven cloth W surface outside the cover 41 is simple in grasping the traveling state of the sensor head 14 in the cover 41.
[0024]
Next, a second embodiment of FIGS. 7A and 7B will be described. The same components as those in the first embodiment are denoted by the same reference numerals.
In this embodiment, the lighting device 25 is attached to the upper part of the sensor head 14, and the cover 41 is provided with a number of leakage holes 413. The light of the lighting device 25 can be visually recognized from the outside of the cover 41 through the leakage hole 413, and the movement state of the lighting hole of the lighting device 25 through the leakage hole 413 as a leakage means is determined by the movement of the sensor head 14 in the cover 41. Enables understanding of the situation. The leakage hole 413 is on the upper side of the cover 41 and on the opposite side of the woven fabric W from the front side W1 with the cover 41 interposed therebetween. Such a position of the leak hole 413 is a position where the operator can most easily grasp the movement state of the sensor head 14 in the cover 41. The formation of the leakage hole 413 on the cover 41 increases the degree of freedom in selecting a position where the lighting light of the lighting device 25 in the cover 41 is easily visible.
[0025]
Next, a third embodiment of FIG. 8 will be described. The same components as those in the first embodiment are denoted by the same reference numerals.
In this embodiment, the scanning confirmation switch 27 is signal-connected to the loom control computer Co. If the sensor head 14 travels at a speed lower than the predetermined speed V at the time of inspection, and tx falls outside the range of [to-Δt, to + Δt], a defect presence detection signal is output. The sensor head 14 is in a stopped state in the weaving stop state due to the detection of a defect, but if the scanning confirmation switch 27 is turned on, the loom control computer Co commands the operation of the inspection motor 13. If there is no failure of the inspection motor 13 or biting of the fluff, the sensor head 14 runs smoothly at a predetermined speed V. The sensor head 14 does not run smoothly if the inspection motor 13 is broken or if there is a fluff bite. The configuration in which the scanning confirmation switch 27 is installed makes it possible to determine whether or not the inspection stop is due to a failure of the inspection motor 13 or the biting of the fluff.
[0026]
In the present invention, the following embodiments are also possible.
(1) In the first embodiment, the projection light of the lighting device 25 is reflected on the woven cloth W surface on the pre-weaving W1 side.
(2) The light emitted from the projector 17 is leaked out of the cover 41, and the projector 17 is also used as a lighting display means.
(3) In the woven fabric inspection apparatus that disposes the inspection light projecting means over the entire woven width of the woven fabric and moves only the inspection light receiving means, the reflecting mirror is moved integrally with the light receiving means, The irradiation light of the inspection light projecting means is reflected out of the cover by a reflecting mirror.
(4) A lighting display means is attached to the endless belt 12 in the first embodiment.
[0027]
It described together with its effect on inventions that can be grasped from the embodiments described above.
(1) weaving the fabric fabric inspection apparatus in a provided woven machine operation confirmation means for confirming the operation of the round trip means during stopping.
[0028]
It is possible to determine whether or not the inspection stop is due to a failure of the inspection motor 13 or the biting of the fluff.
[0029]
【The invention's effect】
As described above in detail, in the present invention, since the lighting light of the lighting display means is made visible from outside the cover, it is possible to grasp the running condition of the sensor head and grasp the abnormality of the woven fabric inspection device. Play.
[Brief description of the drawings]
FIG. 1 is a front sectional view showing an enlarged sectional view of a sensor head according to a first embodiment.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
3 is a cross-sectional view taken along line BB in FIG.
FIG. 4 is a schematic plan view showing a scanning region of a detection range.
FIG. 5 is a combination diagram of a detection range and a signal processing circuit on a woven fabric.
FIG. 6 is a graph illustrating signal processing in a signal processing circuit.
7A is a front sectional view showing an enlarged sectional view of a sensor head according to a second embodiment; FIG. (B) is CC sectional view taken on the line of (a).
FIG. 8 is a combination diagram of a detection range on a woven fabric and a signal processing circuit according to the third embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 13 ... Inspection motor which comprises reciprocating travel means, 14 ... Sensor head, 25 ... Lighting device used as lighting display means, 19, 20 ... Light receiving element used as photoelectric sensor, 41 ... Cover, 412 ... Clearance used as leakage means, 413 ... Leakage hole serving as a leakage means.

Claims (2)

A sensor head that moves while picking up light reflecting the weaving state of the woven fabric on the loom and a cover that covers the scanning path of the sensor head, and uses a photoelectric sensor that outputs an electrical signal corresponding to the amount of received light In the fabric inspection device that detects the presence or absence of defects in the fabric,
Lighting display means that moves integrally with the sensor head and lights up;
Leakage means for leaking the lighting light of the lighting display means out of the cover,
The lighting display means is turned on during scanning of the sensor head, and the leaking means is a woven cloth inspection device in a loom, which is a gap between the cover and the woven cloth surface. The woven fabric inspection apparatus for a loom according to claim 1, wherein the lighting display means projects light from the gap onto a woven fabric surface outside the cover .

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