JP3477877B2 - Woven cloth inspection equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a woven fabric inspecting device for detecting a defect of a woven fabric by using a photoelectric sensor which outputs an electric signal according to the amount of received light.

[0002]

2. Description of the Related Art Usually, a woven woven fabric is passed through a proofing process, and the woven fabric is checked for defects.
However, defects due to abnormal warp threading between the reeds between the reeds occur as so-called warp lines continuously in the warp direction of the woven fabric, so the defect investigation in the inspection process after weaving is too late. JP-A-60-
In Japanese Patent No. 231850 and Japanese Patent Laid-Open No. 3-249243, a detection device is mounted on a loom, and the woven fabric is detected on the loom.

[0003]

However, since these conventional detecting devices are mounted on the loom, one detecting device is required for each loom. In addition, a traveling device for traveling the traveling body equipped with the photoelectric sensor in the weft width direction is also required. Therefore, the cost for inspection is generally high.

An object of the present invention is to provide a woven fabric inspection device which can reduce the cost for inspection.

[0005]

To this end, in the invention of claim 1, a traveling body that is provided with wheels and is run on a woven fabric by a manual operation, and a photoelectric sensor provided on the traveling body,
To detect the relative velocity between the traveling member and the fabric
A speed detecting means provided in the traveling body, and the traveling body
Which is provided in, the pattern correction means for correcting the signal pattern of the electric signal obtained from the photoelectric sensor to a signal pattern in the reference speed state based on the detected speed detected by the speed detection means, and the traveling body, Storage means for storing the reference signal pattern in the reference speed state and the traveling body are provided to compare the corrected signal pattern with the reference signal pattern to determine the presence / absence of a defect and detect the defect when there is a defect. A woven fabric inspection device is configured to include a determination unit that outputs a signal and a warning unit that is provided on the running body and that warns that a defect is detected based on the output of the defect detection signal.

According to the invention of claim 2, in claim 1,
A woven fabric inspection device is provided with reference signal pattern changing means for changing the reference signal pattern stored in the reference signal pattern storage means in response to a change in the warp pitch of the woven cloth. According to the invention of claim 3, the wheel is provided, and the operation is performed manually.
And the running direction of the running body
A plurality of photoelectric sensors arranged side by side on the traveling body,
Provided on the traveling body, and difference calculating means for calculating a difference between at least one electrical signal and other electrical signals of the photoelectric sensor of the plurality of photoelectric sensors, provided in the running body, storing a reference value The reference value storage means and the traveling body are provided.
A determination unit that determines the presence or absence of a defect based on a comparison between the difference value obtained by the calculation of the difference calculation unit and the reference value, and outputs a defect detection signal when it is determined that the defect exists.
A woven fabric inspection device is provided, which is provided on the traveling body and includes a warning unit that warns that a defect is detected based on the output of the defect detection signal.

[0007]

According to the invention of claim 1, when the running body is run on the woven cloth in the width direction of the cloth, the speed detecting means detects the relative speed between the woven cloth and the running body. The pattern correction means corrects the signal pattern obtained from the photoelectric sensor into a signal pattern in the reference speed state based on the detected speed. The judging means compares the corrected signal pattern with the reference signal pattern, and outputs a defect detection signal when judging that there is a defect. The warning means warns that there is a defect based on the output of the defect detection signal. Running of the running body is given is operated by hand
Therefore, the woven fabric inspection device of the present invention can be shared by a plurality of looms.
Therefore, the cost for inspection can be reduced.

[0008] In the present invention of claim 2, stored in the reference signal pattern storage means by the operation of the reference signal pattern changing means
The reference signal pattern being changed is changed. This change is made in accordance with the change in the warp pitch of the woven fabric.

According to the third aspect of the present invention, when the running body is manually run, the difference calculating means calculates the difference between the electric signal of at least one of the plurality of photoelectric sensors and the electric signal of the other photoelectric sensor. . The calculation of the difference is illumination light,
Eliminates changes in electrical signals due to disturbances such as flies. The judging means compares the calculated difference with a preset reference value. When the calculated difference exceeds the reference value, the judging means outputs a defect detection signal. The warning means warns that there is a defect based on the output of the defect detection signal. Of the running body
Since the running is manually operated, the fabric inspection of the present invention is performed.
The anti-device can be shared by multiple looms, and the cost for inspection is
Can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment embodying the present invention will now be described with reference to FIG.
~ It demonstrates based on FIG. FIG. 1 shows the inside of the traveling body 1. A light projector 2, a light receiver 3, and optical systems 4 and 5 are housed in the traveling body 1. The light receiver 3 is a single light receiving element 3
It has -1. The traveling body 1 has wheels 6 and 7 on axles 8 and 9
Is attached through. Disk 1 on the front axle 8
0 is fixed, and minute projections 1 are formed on the circumferential surface of the disk 10.
0-1 are arranged at equal pitches in the circumferential direction. A speed detector 11 of a light emitting and receiving type is installed near the peripheral surface of the disk 10. As shown in FIG. 3, the speed detector 11 includes a light projecting element 11-1, a light receiving element 11-2, a clock 11-3, and a speed calculating circuit 11-4. The light projected from the light projecting element 11-1 hits the peripheral surface of the disk 10 and is reflected, and when the disk 10 is rotating, the reflected light from the disk 10 becomes a pulse state and is reflected by the light receiving element 11-2. Be captured. The speed calculation circuit 1-4 calculates the speed by measuring the pulse interval of the pulse signal obtained from the light receiving element 11-2 with the clock 11-3.

When the wheels 6 and 7 are in contact with the woven fabric W,
The light projected from the projector 2 illuminates the woven cloth W via the optical system 4, and the light reflected from the woven cloth W is received by the light receiving element 3-1 via the optical system 5. The light receiving element 3-1 converts the received light into an electric current. This converted current signal becomes an electric signal according to the received light intensity.

An inspection control circuit 12 is incorporated in the traveling body 1. As shown in FIG. 3, the detection control circuit 12 is
It is composed of a current-voltage conversion circuit 13, a correction circuit 14, a storage circuit 15, a comparison circuit 16, and an output circuit 17. A reference signal pattern input device 18 is arranged on the upper surface of the traveling body 1. The reference signal pattern input device 18 is for inputting and setting the reference signal pattern to the storage circuit 15. The reference signal pattern in this case has a constant reference time t _0.
Is.

A power switch 19 and a warning lamp 20 are arranged on the upper surface of the traveling body 1. When the power switch 19 is turned on, the projector 2 projects light, and the photoelectric conversion function of the light receiving element 3-1, the speed detection function of the speed detector 11 and the control function of the detection control circuit 12 are activated. The warning lamp 20 is turned on based on the output of the operation signal from the output circuit 17. For the inspection of the woven cloth W, with the power switch 19 turned on, the traveling body 1 is placed on the woven cloth W and run in the weft Y direction as shown in FIG.

The light receiving element 3-1 outputs the converted current signal to the current-voltage conversion circuit 13. The current-voltage conversion circuit 13 converts the converted current signal into a voltage signal and outputs it to the correction circuit 14. The waveform S _{1 in} FIG. 4A is an example of the voltage signal. The voltage signal S ₁ represents the signal pattern of the detected electrical signal. The correction circuit 14 uses the voltage signal S based on the detected speed K ₁ detected by the speed detector 11 and the reference speed K _0.
Correct ₁ to the voltage signal in the reference speed state. Figure 4
Waveform S _{2 in} (b) represents the corrected voltage signal S ₂ . The voltage signal S ₂ represents the signal pattern of the corrected electrical signal. The correction circuit 14 compares the corrected voltage signal S ₂ with the comparison circuit 1
Output to 6.

In FIG. 4A, t _1,1 , t _2,1 and t
_3,1, t _4,1, t _5,1 represents the time position of the crest portion of the voltage signal S _1. T _1,2 , t _2,2 in FIG.
_{t 3,2, t 4, 2,} t 5,2 represents the time position of the crest portion of the voltage signal S _2. The crest portion corresponds to the arrangement position of the warp yarns T. Detection speed K ₁ , reference speed K ₀ , time difference (t _{m + 1,1} −
tm _{, 1} ) (m = 1 to 4), time difference (tm _{+ 1,2-} tm _{, 2} )
There is a relation of the following equation between (m = 1 to 4). _{V 1 / V 0 = (t} m + 1,2 -t m, 2) / (t m + 1,1 -t
_{m, 1} ) When the detected speed K ₁ is larger than the reference speed K ₀ , the time difference (t _{m + 1,1} −t _{m, 1} ) is enlarged and corrected, and the detected speed K ₁
Is smaller than the reference speed K ₀ , the time difference (t _{m + 1,1}
-T _{m, 1} ) is reduced and corrected. When V ₁ = V ₀ , the voltage signal S ₂ is the same as the voltage signal S ₁ . In the illustrated case, the detected speed K ₁ is higher than the reference speed K ₀ .

The comparison circuit 16 compares the reference time t ₀ with the corrected time difference (t _{m + 1,2-} t _{m, 2} ). The absolute value of the difference [(t _{m + 1,2-} t _{m, 2} ) -t ₀ ] between the _two is the tolerance Δt.
_When it exceeds ₀ , the comparison circuit 16 determines whether there is a defect and outputs a defect detection signal to the output circuit 17. The absolute value of the difference [(t _{m + 1,2} −t _{m, 2} ) −t ₀ ] between the _two is the tolerance Δ.
When it is within t ₀ , the comparison circuit 16 determines that there is no defect and does not output the defect detection signal. The output circuit 17 turns on the warning lamp 20 in response to the input of the defect detection signal.

When the pitch of the warp threads T on the woven cloth W is constant,
Traveling speed K of traveling body 1₁Is constant, the time difference (t
_{m + 1,1}-T_{m, 1}) Is almost constant, and the corrected time difference
(T_{m + 1, 2}-T_{m, 2}) Is also almost constant. This state is warp
Regarding T, there is no defect in the arrangement state. On woven cloth
The so-called warp, which is a drawback, is caused by the wrong threading of the warp between the reeds.
It occurs as a result. For example, a certain warp is the original reed
If it is passed between the adjacent reeds, the detected voltage signal
Regarding the time position corresponding to the original reed wing and the adjacent reed wing
When the voltage signal value at the corresponding time position is normal
Is different from. Waveform S in FIG. 4 (c)₃Is at the position where the muscles are generated
Represents a corrected voltage signal. t_1,3, T _2,3, T
_4,3, T_5,3Is the voltage signal S₃The time position of the crest of
You If there is a meridian, adjacent crests corresponding to the meridian
Interval of parts (t_4,3-T_2,3) Compared to the case without muscles
spread. This spread is (t_{m + 1,2}-T_{m, 2})> T₀Against
To respond.

The reference time t ₀ is determined by the reference speed K ₀ and the set pitch of the warp threads T, and the set pitch of the warp threads T differs depending on the fabric design. In the case of detecting another woven cloth different from the warp pitch of the woven cloth W in FIG. 1, the reference time t ₀ may be changed according to the warp pitch by operating the reference signal pattern input device 18.

Detecting by the detecting device of the present embodiment, after the operation of threading the warp between the reeds, which is performed when the warp breakage occurs,
Alternatively, it is performed when the loom is stopped for some reason. The running body 1 cannot always run at a constant speed by manual operation. However, accurate detection can be performed by correcting the voltage signal S ₁ detected based on the detected speed K ₁ and the reference speed K ₀ to the voltage signal S ₂ in the reference speed state. The device for performing the correction and performing the inspection can be used in other looms, and is very advantageous in cost as compared with the conventional device in which the inspection device is installed for each loom. or,
A drive mechanism and a guide mechanism for traveling the traveling body 1 are not required, and the cost of the inspection device itself is reduced as compared with the conventional inspection device.

Next, the embodiment shown in FIGS. 5 to 7 will be described. The same components as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. As shown in FIG. 5, the light receiver 21 includes a pair of light receiving elements 22 and 23.
Are arranged side by side in the traveling direction of the traveling body 1. The disk 10 and the speed detector 11 in the first embodiment are not incorporated in the traveling body 1. The running body 1 runs in the weft Y direction.

Reference numeral 22-1 shown in FIG. 6 indicates a detection range on the woven cloth W by the light receiving element 22, and 23-1 indicates a detection range on the woven cloth W by the light receiving element 23. The warp threads T of the woven fabric W are passed between the reeds of a reed (not shown) in units of several lines, and the detection range 22
The widths of -1, 23-1 in the weft Y direction are set to the pitch of the reed wing. The widths of the detection ranges 22-1 and 23-1 in the warp T direction are several times larger than the width of the weft Y direction.

Inspection control circuit 24 incorporated in the traveling body 1.
Is the same as the detection control circuit 12 of the first embodiment as shown in FIG.
different. The light receiving elements 22 and 23 convert the received light into an electric current.
Replace. The light receiving element 22 converts the converted current signal into current-voltage.
The converted current signal is output to the circuit 25, and the light receiving element 23 outputs the converted current signal
-Output to the voltage conversion circuit 26. Current-voltage conversion circuit 2
Reference numerals 5 and 26 denote the converted current signal and the voltage signal E.₁, E₂Converted to
And outputs it to the difference calculation circuit 27. The difference calculation circuit 27 uses both currents.
-Voltage signal E input from the voltage conversion circuits 25 and 26₁，
E₂Calculate the difference between the values of. In this calculation, the voltage signal E₁of
Value to voltage signal E₂Is subtracted. Difference calculation circuit 27
Is the difference signal ΔE obtained by calculation₁₂Output to the comparison circuit 28
To do. The comparison circuit 28 receives the input difference signal ΔE₁₂And the standard beforehand
It is set in the memory circuits 30 and 31 by the value setting device 29.
Standard value V₁, V₂Compare with. Reference value V₁Is positive, group
Quasi value V₂Is negative. Difference signal ΔE₁₂Value of range [V₁，
V ₂], The comparison circuit 28 outputs the output circuit 17
The defect detection signal is output to. Difference signal ΔE₁₂Value of range
[V₁, V₂]], The comparison circuit 28 outputs
No defect detection signal is output to the path 17.

The waveform E ₁ in FIG. 7A represents the voltage signal E ₁ output from the current-voltage conversion circuit 25, and the waveform E ₁ in FIG.
Waveform E ₂ represents the voltage signal E ₂ output from the current-voltage conversion circuit 26. The waveform E _{3 in} FIG. 7C represents the difference signal ΔE ₁₂ obtained by subtracting the value of the waveform E ₂ from the value of the waveform E ₁ . The square waves E ₄ and E _{5 in} FIG. 7D represent the defect detection signals output from the comparison circuit 28. 4 (a) to 4
The horizontal axis in (d) represents time. 4 (a) to 4
The vertical axis in (c) represents voltage.

Waveform E₁Protrusion E_1-1To the light receiving element 22
Therefore, it represents an abnormality relating to the detected warp yarn. Waveform E₂of
Projection E_2-1Is the warp detected by the light receiving element 23.
Represents a related abnormality. Projection E_1-1, E_2-1The time difference is
The light receiving elements 22 and 23 that move in the direction of the yarn Y are set to the weft Y direction.
It is caused by arranging in parallel. Waveform E₃Protrusion E
_3-1Is the protrusion E_1-1And this protrusion E_1-1In the time domain of
Corresponding waveform E₂It is the difference from the substantially flat part. Waveform E
₃Protrusion E_3-2Is the protrusion E_2-1And this protrusion E_2-1
Waveform E corresponding to the time domain of₁Due to the difference with the flat part of
is there. Square wave E_FourTime width t₁Is the reference value V₁To the positive side
Overhanging protrusion E_3-1Square wave E corresponding to the time width of_Fivetime
Interval t₂Is the reference value V₂E over the negative side_3-2of
Corresponds to the time range.

Detection ranges 22-1, 2 of the light receiving elements 22, 23
The range in the direction of the weft Y of 3-1 is set to the pitch of the reed wing. Thus, unlike in the through muscle portion and the normal portion on the light receiving amount is woven W in the light receiving elements 22 and 23, waveform E _1, E ₂ of the protrusions E _1-1, the voltage signal as shown by E _2-1 Variations of E ₁ and E ₂ are obtained.

The output of the defect detection signal represented by the square waves E ₄ and E ₅ is the difference signal ΔE ₁₂ between the voltage signals E ₁ and E ₂ obtained from the light receiving elements 22 and 23 and the reference values V ₁ and V ₂ . It is determined based on the comparison result of. Disturbances such as the presence of illuminating light other than the inspection device or the presence of cotton dust cause a voltage signal
Change ₁ and E ₂ . That is, the voltage signals E ₁ and E ₂ contain changes due to disturbance. Such changes in the voltage signals E ₁ and E ₂ do not correctly reflect the woven state of the woven cloth, and it is judged whether or not there is a defect on the woven cloth based on the result of comparison between these voltage signals E ₁ and E ₂ and the reference value. If you do, false inspection will occur. However, change due to the disturbance which has penetrated into a voltage signal E _1, the difference signal Delta] E ₁₂ In each voltage signal taking the difference E ₂ is substantially canceled. Therefore, the difference signal ΔE ₁₂ accurately reflects the presence or absence of an abnormality relating to the warp T, and the difference signal ΔE ₁₂ is compared with the reference values V ₁ and V ₂ to detect the presence or absence of an abnormality relating to the warp. Increase. Moreover, in this embodiment, the determination as to whether or not there is a defect is not affected by the traveling speed of the traveling body 1.

Also in this embodiment, the same cost advantage can be obtained as in the first embodiment. Further, since the received light intensity changes when the warp density changes, the reference values V ₁ and V ₂ also need to be changed, but the reference value can be easily changed by the operation of the reference value setting circuit 29, and it is possible to change the fabric structure. Easy to deal with.

In each of the above embodiments, the irradiation area of the projector 2 is set between the front and rear wheels 6 and 7, but the projector 2 and the light receiver 3 (or 21) are provided on the front side of the front wheel 6 as shown in FIG. An embodiment is also possible in which the irradiation area of the projector 2 is arranged so as to come to the front side of the front wheel 6. In this way, the end portions of the woven fabric W can be inspected while the wheels 6, 7 are on the woven fabric W. If the distance between the irradiation area and the optical systems 4, 5 changes, false inspection may occur, but when the wheels 6, 7 are always on the woven cloth W, the irradiation areas and the optical systems 4, 5 are different from each other. The distance between them does not change, and there is no risk of false detection. The irradiation area may be located behind the rear wheel 7.

Further, in the first embodiment, it is desirable to employ the front wheels 6 provided with slip prevention. The slip of the front wheel 6 causes an erroneous detection by the speed detector 11. As a non-slip, for example, the front wheel 6
Fine needles may be planted on the peripheral surface of the, or a large number of small protrusions hooked on the woven cloth may be provided.

[0030]

As described above in detail, the first and second claims
In any of item 3, the traveling body is manually operated.
Since it is made to run on woven cloth, the cost for inspection
Can be reduced. Further, according to the invention of claim 1, a speed detector is incorporated in a detection device that is manually run on the woven fabric,
Since so as to determine the presence or absence of a defect based on the comparison of the reference signal pattern and the detected signal pattern in the reference speed condition may Hoshino sure an accurate Kenhan.

[0031] In the invention of claim 2, since to be able to change the reference signal pattern, pressurized to the effect of cost reduction
For example, it may perform Kenhan high accuracy with respect to change of the warp pitch. Further, according to the invention of claim 3, since the inspection device for detecting the difference between the electric signals obtained from the photoelectric sensors arranged in parallel in the traveling direction of the traveling object is made to run on the woven cloth, the inspection is performed with high accuracy. the can Hoshi sure.

[Brief description of drawings]

FIG. 1 is a front sectional view of a woven fabric inspection device showing a first embodiment of the present invention.

FIG. 2 is a plan view of the fabric inspection device.

FIG. 3 is a circuit diagram showing a detection control circuit.

4A, 4B, and 4C are graphs for explaining voltage signal correction.

FIG. 5 is a front cross-sectional view of a fabric inspection device showing another example.

FIG. 6 is a combination diagram of a detection range on a woven fabric and an inspection control circuit.

7A to 7D are graphs for explaining signal processing in the detection control circuit.

FIG. 8 is a plan view showing another example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Running body, 3-1, 22, 23 ... Light receiving element used as a photoelectric sensor, 11 ... Speed detector, 14 ... Correction circuit used as pattern correction means, 15 ... Storage circuit used as reference signal pattern storage means, 16 ... a comparison circuit serving as a judging means, 18 a reference signal pattern input device serving as a reference signal pattern changing means, 20 a warning lamp serving as a warning means, 30, 31 a storage circuit serving as a reference value storage means.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01N 21/00-21/01 G01N 21/17-21/61 G01N 21/84-21/958 PATOLIS

Claims (3)

(57) [Claims] 1. A woven fabric inspection device for detecting a defect of a woven fabric by using a photoelectric sensor that outputs an electric signal according to a received light amount, the running body having wheels and running on the woven fabric by manual operation. When a photoelectric sensor provided in the running body, to detect the relative velocity between the fabric and the running body
A speed detection means provided in the traveling body, and a signal pattern in a reference speed state based on the detection speed detected by the speed detection means for a signal pattern of an electric signal provided in the traveling body and obtained from the photoelectric sensor. Pattern correction means for correcting a pattern, storage means provided in the traveling body for storing a reference signal pattern in a reference speed state , and the corrected signal pattern provided in the traveling body and comparing the reference signal pattern with each other. A determination means for determining the presence or absence of a defect and outputting a defect detection signal when it is determined that there is a defect ; and a warning means provided in the traveling body and warning the defect detection based on the output of the defect detection signal. Woven cloth inspection device equipped. 2. The warp pitch variation of the woven fabric as claimed in claim 1.
Further, if, it is stored in the reference signal pattern storage means
And it is woven fabric inspection apparatus comprising a reference signal pattern changing means for changing the reference signal pattern that. 3. A woven fabric inspection device for detecting a defect of a woven fabric by using a photoelectric sensor that outputs an electric signal according to a received light amount, the running body having wheels and running on the woven fabric by manual operation. And a plurality of units arranged on the traveling body side by side in the traveling direction of the traveling body.
A photoelectric sensor, provided in the running body, and difference calculating means for calculating a difference between at least one electrical signal and other electrical signals of the photoelectric sensor of the plurality of photoelectric sensors, provided in the traveling body a reference value storage means for storing a reference value, provided in the running body, performs determination drawbacks presence based on a comparison between the reference value and the resulting difference value by a calculation of the difference calculation means, shortcomings Yes A woven fabric inspecting device, comprising: a determination unit that outputs a defect detection signal at the time of determination, and a warning unit that is provided in the traveling body and that warns that a defect is detected based on the output of the defect detection signal.