JP4290243B2 - 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]
This type of woven fabric inspection apparatus is disclosed in JP-A-6-65843 and JP-A-9-273068.
[0003]
In the device disclosed in Japanese Patent Laid-Open No. 6-65843, a spatial filter is used as a photoelectric sensor, and the amplitude of an electric signal obtained by the spatial filter changes according to increase or decrease in the amount of received light. When a defect on the woven fabric is captured, the amplitude of the electric signal increases. The electrical signal is subjected to full-wave rectification, peak value hold, and smoothing processing, and the duration time when the magnitude of the electrical signal subjected to such processing is equal to or greater than a reference value is measured. If this duration exceeds the reference time, a determination that there is a defect is made.
[0004]
In the apparatus disclosed in Japanese Patent Laid-Open No. 9-273068, a pair of light receiving elements are used as photoelectric sensors, and each electric signal obtained by the pair of light receiving elements is passed through a difference calculation circuit. The difference calculation circuit outputs a difference between the two electric signals, and the difference signal has a signal component having a period corresponding to the arrangement pitch of the warps. If this period is out of the reference range, a determination of a defect is made.
[0005]
[Problems to be solved by the invention]
The sensor head is guided along the rail, but when the fluff is inserted between the rail and the sensor head, the traveling speed of the sensor head is lower than a predetermined speed. Alternatively, when the motor for reciprocating the sensor head breaks down, the traveling speed of the sensor head decreases or the sensor head stops. When the traveling speed of the sensor head decreases, in the device disclosed in Japanese Patent Laid-Open No. 6-65843, the duration increases with a decrease in the traveling speed of the sensor head, and in the device disclosed in Japanese Patent Laid-Open No. 9-273068, The period increases as the traveling speed of the sensor head decreases. In any of the devices disclosed in Japanese Patent Laid-Open Nos. 6-65843 and 9-273068, the presence / absence of a defect is determined based on a preset reference time. Therefore, in the apparatus disclosed in Japanese Patent Laid-Open No. 6-65843, if a signal with an amplitude exceeding the reference value is output when it is not a defect, the duration time is set to the reference time when the traveling speed of the sensor head is reduced. It may exceed. In the apparatus disclosed in Japanese Patent Application Laid-Open No. 9-273068, the cycle is out of the reference range when the traveling speed of the sensor head is reduced. That is, when the traveling speed of the sensor head decreases, there is a false detection that there is a defect even though there is no defect.
[0006]
An object of the present invention is to avoid false detection caused by abnormal running of a sensor head.
[0007]
[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, and uses a photoelectric sensor that outputs an electrical signal corresponding to the amount of received light to check for the presence or absence of defects in the woven fabric. The invention is directed to a woven fabric inspection apparatus for detecting, and in the first aspect of the invention, a travel abnormality detection means for detecting the presence or absence of a travel abnormality of the sensor head and outputting a travel abnormality detection signal; Woven cloth inspection comprising: a detection stop signal output means for outputting a detection stop signal in response to an input; and a scanning control means for stopping the operation of the sensor head in response to the input of the detection stop signal. Configured the device.
[0008]
Ascertaining the presence or absence of the sensor head running abnormality makes it possible to distinguish between a determination result having a defect due to the traveling of the sensor head and a determination result having a defect due to an actual defect occurrence.
[0011]
According to a second aspect of the present invention, in the first aspect of the present invention, the running abnormality detecting means is configured to detect the presence or absence of a running abnormality of the sensor head based on the period of the electrical signal obtained according to the arrangement interval of the warps.
[0012]
The cycle of the electrical signal reflects the traveling speed of the sensor head, and the cycle becomes longer when the traveling speed of the sensor head decreases. The presence / absence of an abnormality in traveling of the sensor head is detected based on the change in the cycle. A configuration in which an electrical signal obtained from the photoelectric sensor for inspection is used for detecting whether or not the sensor head is running abnormally is simple.
[0013]
According to a third aspect of the present invention, there is provided a reciprocating means having a detection motor for reciprocating the sensor head according to the first aspect of the invention, and an abnormality in the traveling of the sensor head based on the rotation state of the inspection motor. The running abnormality detecting means for detecting the presence or absence of the vehicle is configured.
[0014]
The rotational state of the inspection motor reflects the traveling state of the sensor head. When the rotational speed of the inspection motor decreases, the traveling speed of the sensor head decreases.
According to a fourth aspect of the present invention, in any one of the first to third aspects, an abnormality presence / absence detection for setting an abnormality presence / absence detection validation range and an abnormality presence / absence detection invalidation range along the travel path of the sensor head. Abnormality presence / absence detection enabled range set by the range setting means and the abnormality presence / absence detection range setting means performs abnormality presence / absence detection, and abnormality presence / absence detection invalidation range set by the abnormality presence / absence range setting means performs abnormality presence / absence detection. The running abnormality detection means comprising an abnormality presence / absence detection control means that is substantially interrupted is configured.
[0015]
The abnormality presence / absence detection validation range and the abnormality presence / absence detection invalidation range are arbitrarily set by the abnormality presence / absence detection range setting means. The abnormality presence / absence detection control means validates only the defect presence / absence detection result in the abnormality presence / absence detection validation range arbitrarily set by the abnormality presence / absence detection range setting means.
[0016]
According to a fifth aspect of the present invention, in the fourth aspect , the abnormality presence / absence setting for setting the abnormality presence / absence detection validation range and the abnormality presence / absence detection invalidation range by designating a distance measured from a predetermined reference position on the travel route. A detection range setting means was configured.
[0017]
The abnormality presence / absence detection validation range and the abnormality presence / absence detection invalidation range can be arbitrarily and easily set by specifying a distance measured from the reference position.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
[0019]
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, and a guide pulley 16 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.
[0020]
The sensor head 14 includes a projector 17, an imaging lens 18, a pair of light receiving elements 19 and 20 that serve as photoelectric sensors, and a signal processing circuit board 21. 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.
[0021]
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.
[0022]
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. As shown in FIG. 1, the sensor head 14 reversely travels at a position indicated by a chain line near the end of the weaving width. A region surrounded by a leftward arrow Q2 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 left direction. That is, at the time of inspection, the projection light from the projector 17 on the sensor head 14 scans in the woven width direction of the woven fabric W. The woven fabric W moves in the direction of arrow R.
[0023]
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.
[0024]
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.
[0025]
The comparison circuit 32 compares the input difference signal ΔS with the reference value V (> 0) preset by the reference value setting circuit 33. When the value of the difference signal ΔS exceeds the reference value V, 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.
[0026]
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 a defect detection signal. If tx is within the range of [to−Δt, to + Δt], the comparison circuit 37 does not output a defect detection signal.
[0027]
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.
[0028]
A defect presence / absence determining means C2 including a comparison circuit 32, a reference value setting circuit 33, a control signal generation circuit 34, a counter 35, a reference clock 36, a reference value setting circuit 38, and a comparison circuit 37 is calculated by a difference calculation circuit 30. The presence / absence of a defect is determined based on the difference ΔS. The calculation of the difference ΔS eliminates the change in the electric signal due to the influence of disturbance such as illumination light and fluff.
[0029]
The warp T is passed in units of a certain number between adjacent wings, but for example, the number of warp passing through a certain wing is insufficient, and the number of warp passing between adjacent wings is more than specified. Such a situation may occur. When such a situation continues, so-called warps are generated on the woven fabric, and a defective woven fabric is produced. 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.
[0030]
An output circuit 39 is signal-connected to the comparison circuit 37, and alarm devices 25 and 42 are signal-connected to the output circuit 39. The defect detection signal output from the comparison circuit 37 is input to the output circuit 39.
[0031]
A comparison circuit 22 is signal-connected to the counter 35, and a reference value setting circuit 26 is signal-connected to the comparison circuit 22. An output circuit 39 is signal-connected to the comparison circuit 22. The comparison circuit 22 compares the reference value τ preset by the reference value setting circuit 26 with the time interval tx obtained from the counter 35. The reference value τ is, for example, twice or more larger than to + Δt. When tx is greater than or equal to the reference value τ, the comparison circuit 22 outputs a running abnormality detection signal to the output circuit 39. When tx does not reach the reference value τ, the comparison circuit 22 does not output an abnormality detection signal to the output circuit 39.
[0032]
A memory circuit 40 is signal-connected to the output circuit 39, and an input device 41 is signal-connected to the memory circuit 40. Information on the valid range is input to the memory circuit 40. Information on the valid range is input by the input device 41. As shown in FIGS. 1 and 4, the range [X1, X2] is an effective range, and the other ranges are invalidated ranges. The validation range and the invalidation range are set on the basis of the distance positions X1 and X2 measured from the reference position Xo as the reference position Xo as the chain line position of the left sensor head 14 in FIG.
[0033]
The inspection motor 13 is controlled by the scanning control device C1. As shown in FIG. 5, the scanning control device C <b> 1 includes a drive control circuit 23 and a drive circuit 24. The drive control circuit 23 commands the reciprocating operation of the inspection motor 13 based on a preset scanning program. The drive circuit 24 feedback-controls the reciprocating operation of the inspection motor 13 based on the scanning control command of the drive control circuit 23 and the rotational position information from the rotary encoder 131 incorporated in the inspection motor 13.
[0034]
An output circuit 39 is connected to the loom control computer Co and the drive control circuit 23 for controlling the operation of the loom drive motor M. A rotary encoder 131 is signal-connected to the output circuit 39, and a loom control computer Co is signal-connected to the drive control circuit 23.
[0035]
The output circuit 39, the scanning control device C1, and the loom control computer Co execute the running abnormality detection program shown in the flowcharts of FIGS.
Assume that the output circuit 39 is in the inspection state. The inspection state in the output circuit 39 is a state in which the input of the defect detection signal from the comparison circuit 37 and the input of the running abnormality detection signal from the comparison circuit 22 are permitted. The output circuit 39 grasps the scanning position of the sensor head 14 based on the rotational position information from the rotary encoder 131. It is assumed that the comparison circuit 37 outputs a defect detection signal when the scanning position of the sensor head 14 is within the valid range [X1, X2], but the comparison circuit 22 does not output a running abnormality detection signal. Then, the output circuit 39 shifts from the inspection state to the non-inspection state. The non-inspected state in the output circuit 39 is a state in which the input of the defect detection signal from the comparison circuit 37 and the input of the running abnormality detection signal from the comparison circuit 22 are not permitted. Then, the output circuit 39 outputs a weaving stop signal to the loom control computer Co in response to the input of the defect detection signal and also outputs the inspection stop signal to the scanning control device C1. The loom control computer Co stops the weaving by stopping the operation of the loom driving motor M in response to the input of the weaving stop signal. The scanning control device C1 stops the operation of the inspection motor 13 in response to the input of the inspection stop signal. The output circuit 39 outputs the first alarm signal to the alarm device 25, and the alarm device 25 is activated. Based on the operation of the alarm device 25, the worker grasps the detection of the presence of a defect.
[0036]
When the start switch 27 is turned on after weaving is stopped, the loom control computer Co operates the loom drive motor M to resume weaving and outputs a detection start signal to the scanning control device C1 and the output circuit 39. The scanning control device C1 operates the inspection motor 13 in response to the input of the inspection start signal. In response to the input of the inspection start signal, the output circuit 39 shifts from the non-inspection state to the inspection state.
[0037]
Assume that the comparison circuit 37 outputs a defect detection signal and the comparison circuit 22 outputs a running abnormality detection signal when the scanning position of the sensor head 14 is within the valid range [X1, X2]. The output circuit 39 outputs a test stop signal to the scanning control device C1 in response to the input of the defect detection signal and the running abnormality detection signal. The scanning control device C1 stops the operation of the inspection motor 13 in response to the input of the inspection stop signal. The output circuit 39 outputs a second alarm signal to the alarm device 42, and the alarm device 42 is activated. The operator grasps the occurrence of abnormal running of the sensor head 14 based on the operation of the alarm device 42.
[0038]
If the comparison circuit 37 outputs a defect detection signal when the scanning position of the sensor head 14 is not within the valid range [X1, X2], the output circuit 39 invalidates the input of the defect detection signal, and the weaving and sensor head 14 Will continue. If the comparison circuit 22 outputs a travel abnormality detection signal when the scanning position of the sensor head 14 is not within the valid range [X1, X2], the output circuit 39 invalidates the input of the travel abnormality detection signal, and the sensor The running of the head 14 is continued.
[0039]
The following effects can be obtained in the first embodiment.
(1-1) When the traveling speed of the sensor head 14 decreases so that the time interval tx measured by the defect presence / absence determining means C2 becomes equal to or larger than the reference value τ, the time interval tx is within the reference range [to−Δt, to + Δt. ], The comparison circuit 37 outputs a defect detection signal. The output circuit 39 stops weaving as a defect detection only by inputting a defect detection signal. However, when the traveling speed of the sensor head 14 decreases so that the time interval tx becomes equal to or greater than the reference value τ, the comparison circuit 22 outputs a traveling abnormality detection signal to the output circuit 39. The output circuit 39 serving as the abnormality signal output means includes a detection stop signal based on the determination of the presence of a running abnormality by the running abnormality detecting means constituted by the defect presence / absence judging means C2, the comparison circuit 22 and the reference value setting circuit 26. An abnormality detection signal called an alarm signal is output. Therefore, the running abnormality of the sensor head 14 is not regarded as a detection with a defect, and the false detection due to the running abnormality of the sensor head 14 does not occur.
(1-2) The period (time interval tx) of the electric signal obtained from the light receiving elements 19 and 20 that are photoelectric sensors for inspection corresponds to the arrangement interval of the warps T. That is, the cycle of the electrical signal reflects the traveling speed of the sensor head 14, and the cycle becomes longer as the traveling speed of the sensor head 14 decreases. Therefore, the presence or absence of an abnormality in the traveling of the sensor head 14 is detected based on a change in the cycle of the electrical signal obtained from the light receiving elements 19 and 20. A configuration in which an electric signal obtained from the light receiving elements 19 and 20 which are photoelectric sensors for inspection is used for detecting whether or not the sensor head 14 is running abnormally is simple.
(1-3) The input device 41 and the storage circuit 40 are in an arbitrary range along the travel route of the sensor head 14, an activation range that is an abnormality presence detection valid range, and an invalidation that is an abnormality presence detection validation range. The inspection range setting means for setting the range is configured. The output circuit 39 serving as an abnormality presence / absence detection control unit substantially interrupts the inspection when the inspection position of the sensor head 14 is within the set invalidation range. The validation range [X1, X2] and the invalidation range can be arbitrarily set by an input operation of the input device 41. Such arbitrary setting of the validation range and the invalidation range enables detection of the traveling abnormality in the constant speed (speed v) traveling range of the sensor head 14, and the traveling abnormality in the acceleration / deceleration range of the sensor head 14. Inspection errors due to presence / absence detection do not occur.
(1-4) The validation range [X1, X2] and the invalidation range are set by specifying the distances X1, X2 measured from a predetermined reference position Xo on the travel route of the sensor head 14 as a starting point. The setting of the validation range and the invalidation range by specifying the distance measured from the reference position Xo is arbitrary and easy.
(1-5) The validation range [X1, X2] and the invalidation range specify whether or not the defect detection signal output from the comparison circuit 37 is valid, and the travel output from the comparison circuit 22 It defines whether the abnormality detection signal is valid. The sharing of the validation range and invalidation range for detection and the validation range and invalidation range for detecting a running abnormality makes it easy to set the validation range and invalidation range and to facilitate control. Bring.
(1-6) The output circuit 39 serving as the abnormality presence / absence detection control means selects whether or not to adopt the defect presence / absence determination result in the defect presence / absence determination means C2 in light of the validation range [X1, X2] and the invalidation range. The configuration for selecting whether or not to adopt the defect presence / absence determination result on the premise that the defect presence / absence determination unit C2 does not interrupt the defect presence / absence determination is simple in terms of control.
[0040]
Next, a second embodiment of FIG. 9 will be described. The same components as those in the first embodiment are denoted by the same reference numerals.
The output circuit 43 in this embodiment detects the rotation speed of the detection motor 13 and thus the traveling speed of the sensor head 14 based on the rotational position information of the detection motor 13 obtained from the rotary encoder 131. The detected traveling speed information of the sensor head 14 is validated in the validation range [X1, X2] and invalidated in the invalidation range.
[0041]
Also in this embodiment, the abnormal running of the sensor head 14 is not regarded as a detection with a defect, and no false detection due to the abnormal running of the sensor head 14 occurs. Further, the same effects as the items (1-3) to (1-6) in the first embodiment can be obtained.
[0042]
In the present invention, the following embodiments are also possible.
(1) The period in the difference signal ΔS is measured at a time interval between the tops of the waveforms.
(2) When the sensor head 14 is stopped due to the determination that there is a defect, the sensor head 14 is stopped immediately after the determination that there is a defect, and when the sensor head 14 is stopped due to detection of a running abnormality, the sensor head 14 is stopped within the invalidation range. In this way, when a defect is detected, the sensor head 14 stops at the defect detection position, and the defect occurrence position can be easily specified. In addition, it can be easily grasped from the stop position of the sensor head 14 whether the sensor head 14 has been stopped due to the detection of a defect or the detection of a running abnormality.
(3) When the traveling abnormality of the sensor head 14 occurs, only the traveling of the sensor head 14 is stopped and the weaving is continued.
(4) The validation range and invalidation range for inspection and the validation range and invalidation range for detection of running abnormality can be set separately.
(5) The activation range for detecting the traveling abnormality is set only in a part of the constant speed traveling range of the sensor head 14.
(6) As disclosed in JP-A-9-273068, the cloth end of the woven cloth W is detected, and only within the woven width of the woven cloth W is set as an effective range for detecting abnormal running.
[0043]
【The invention's effect】
As described above in detail, in the present invention, since the presence or absence of abnormality in the traveling of the sensor head is detected, there is an excellent effect that the false detection caused by the abnormal traveling of the sensor head can be avoided.
[Brief description of the drawings]
FIG. 1 is a front view showing a first embodiment and incorporating an enlarged sectional view of a sensor head.
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 on a woven fabric, a signal processing circuit, a running abnormality detection device, and a scanning control device.
FIG. 6 is a graph illustrating signal processing in a signal processing circuit.
FIG. 7 is a flowchart showing a running abnormality detection program.
FIG. 8 is a flowchart showing a running abnormality detection program.
FIG. 9 is a combination diagram of a detection range on a woven fabric, a signal processing circuit, a travel abnormality detection device, and a scanning control device according to a second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 14 ... Sensor head, 13 ... Inspection motor which comprises reciprocating travel means, 19, 20 ... Light receiving element used as a photoelectric sensor, 22 ... Comparison circuit which comprises travel abnormality detection means, 25, 42 ... Alarm apparatus, 39 ... Abnormality An output circuit serving as detection signal output means and abnormality presence / absence detection control means, 40... A storage circuit constituting abnormality presence / absence detection range setting means, 41... Input device constituting abnormality presence / absence detection range setting means, and C 2. Defect presence / absence determining means to be configured.

Claims (5)

A woven fabric using a photoelectric sensor that includes a sensor head that moves in the weaving width direction of the woven fabric while picking up light reflecting the weaving state of the woven fabric on the loom, and that outputs an electrical signal corresponding to the amount of light received In the fabric inspection device that detects the presence or absence of defects,
A travel abnormality detection means for detecting the presence or absence of travel abnormality of the sensor head and outputting a travel abnormality detection signal; and a detection stop signal output means for outputting a detection stop signal in response to the input of the travel abnormality detection signal And a cloth control apparatus for a loom comprising a scanning control means for stopping the operation of the sensor head in response to an input of the inspection stop signal . The woven fabric inspection apparatus for a loom according to claim 1, wherein the running abnormality detection means detects presence or absence of running abnormality of the sensor head based on a cycle of the electric signal obtained according to a warp yarn arrangement interval . A reciprocating means having a detection motor for reciprocating the sensor head; and the travel abnormality detecting means detects presence or absence of abnormality of the sensor head based on a rotation state of the inspection motor. The woven fabric inspection apparatus in the loom according to claim 1 . The travel abnormality detection means is set by an abnormality presence / absence detection range setting means for setting an abnormality presence / absence detection valid range and an abnormality presence / absence detection invalidation range along the travel route of the sensor head, and the abnormality presence / absence range setting means. An abnormality presence / absence detection control means for performing abnormality presence / absence detection in the abnormality presence / absence detection validation range and substantially interrupting the abnormality presence / absence detection in the abnormality presence / absence detection invalidation range set by the abnormality presence / absence detection range setting means. woven fabric inspection device in a loom according to any one of claims 1 to 3 there. The abnormality presence detection range setting means, according to claim 4 for setting the abnormality presence detection enabled range and the abnormal presence detecting invalidation range with the specified distance measured a predetermined reference position on the travel route as a starting point Weaving cloth inspection device for looms .

Images