JPH08209501A - Warp yarn checking device in loom - Google Patents

Abstract

PURPOSE: To provide a warp yarn checking device capable of immediately detecting the development of an abnormality in threading warp yarns to reeds. CONSTITUTION: This warp yarn checking device is obtained by providing an endless belt 4 rotating in both ways by a reciprocating driving of a motor 5, and an image capturing camera 2 moving in both ways along a rail 1, placed out of the rocking range of deformed reeds 7 and whose image capturing range is the arranged positions of warp yarns T in the vicinity of the cloth fell W1 of woven fabric W. The image capturing camera 2 is connected to an image processing circuit 8 and the circuit deduces the number of warp yarns T between dents 7-2 of the deformed reeds 7 based on the image information obtained by the image capturing camera 2. In case the number of warp yarns T between the dents 7-2 does no agree to a prescribed number, the image processing circuit 8 outputs the signal of detecting an abnormality in warp yarn threading, which in turn becomes a stop weaving signal, to a loom controlling computer C0 and a motor controlling circuit 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warp inspection device for detecting a warp threading abnormality of a warp on a reed of a loom.

[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. Actual Kaihei 2-9
According to Japanese Patent No. 0686, a detection device is mounted on a loom, and the woven fabric is detected on the loom.

[0003]

However, the actual Kaihei 2-9
In the apparatus disclosed in Japanese Patent No. 0686, since the inspection area of the warp detector is apart from the cloth fell of the woven cloth, warp threads are generated due to abnormal warp threading between the reed blades.

In the warp threading detection device disclosed in Japanese Patent Laid-Open No. 3-161555, a warp thread detector is arranged above the warp thread opening to detect an abnormal threading of the warp thread before it becomes a woven cloth.
In this device, the warp detection time is set when the loom is stopped. The cause of the warp threading abnormality is not only a warp threading error in the warp threading operation after the warp thread breaks but also entanglement between adjacent warp threads during the operation of the loom. When such warp entanglement occurs, a warp threading abnormality occurs in which the warp thread is passed from the space between the reeds, which is the original position for threading the warp, to the space between the adjacent reeds.
Inspection of warp threading abnormality when loom is stopped
The device disclosed in Japanese Patent No. 555 cannot detect a warp threading abnormality that occurs during operation of the loom.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a warp inspection device capable of eliminating defects on a woven fabric due to abnormal warp threading on a reed.

[0006]

Therefore, according to the invention of claim 1, a warp detector having a detection region at a warp arrangement position near the front of the woven fabric is arranged outside the swinging region of the reed, A warp inspecting apparatus is configured such that whether or not there is a warp threading abnormality of the warp threaded through the reed is grasped based on the detection information from the warp detector, and the detection timing of the warp detection information is during the loom operation.

According to the second aspect of the present invention, the warp yarn detector is an image pickup camera, and the detection area of the image pickup camera includes an area where the reed dents are arranged near the beating time. According to the invention of claim 3,
A warp detector was constructed from a light projecting optical fiber and a light receiving optical fiber which were arranged in correspondence with the gap between the reeds of the reed.

[0008]

Function: The warp detector detects the warp near the cloth fell. The warp yarns are detected in units of the width between the reeds, and an abnormality of the warp threading between the reeds is detected based on the detected information.

When an imaging camera is used as the warp detector, the reed wing of the reed is also detected together with the warp, and the number of warp yarns between the detected adjacent reeds is grasped. When an optical fiber is used as the warp detector, the number of warp yarns between the reeds is grasped based on the intensity of received light.

[0010]

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

As shown in FIGS. 1 and 3, a rail 1 is arranged above the woven cloth W in the width direction of the woven cloth W. An imaging camera 2 is suspended and supported on the rail 1 via a guide body 3. The guide body 3 can move along the rail 1.
An endless belt 4 is coupled to the image pickup camera 2, and the endless belt 4 is stretched around a drive pulley 5-1 of a motor 5 and a guide pulley 6. The endless belt 4 reciprocates around by the reciprocating drive of the motor 5, and the imaging camera 2 reciprocates along the rail 1. The motor 5 is the motor control circuit 1
Receive control of 1. When the loom is stopped, the imaging camera 2 stands by at a standby position lateral to the width of the cloth W.

The weft Y, which is ejected from the weft insertion nozzle (not shown) into the opening of the warp T, is guided along the weft insertion passage 7-1 of the deformed reed 7. The image pickup camera 2 is arranged outside the swing area of the deformed reed 7, and the image pickup area of the image pickup camera 2 is the cloth fell W.
It is the arrangement position of the warp threads T near ₁ .

The image pickup camera 2 is connected to the image processing circuit 8. The image processing circuit 8 determines the number of warp yarns T between the reed blades 7-2 of the modified reed 7 based on the image information obtained by the imaging camera 2. When the number of warp threads between the reeds 7-2 in the image is not the predetermined number, the image processing circuit 8 outputs a warp threading abnormality detection signal which is a weaving stop signal to the loom control computer C ₀ and the motor control circuit 11. .

The loom control computer C ₀ operates the loom drive motor 9 in response to the ON operation of the start switch 13 and outputs a weaving start signal to the motor control circuit 11. The motor control circuit 11 operates the motor 5 in response to the input of the weaving start signal. The loom control computer C ₀ commands the operation stop of the loom drive motor 9 in response to the input of the weaving stop signal. The loom control computer C ₀ stops the loom at a predetermined rotation angle based on the rotation angle information obtained from the rotary encoder 10 for detecting the rotation angle of the loom. When the loom is stopped, the deformed reed 7 stops at the position immediately before the beating.

The motor 5 has a built-in rotary encoder 5-2. The rotary encoder 5-2 detects the rotation angle of the motor 5, and this rotation angle information is sent to the image processing circuit 8. The image processing circuit 8 grasps the moving position of the imaging camera 2 based on this rotation angle information. The moving position of the image pickup camera 2 is grasped as a distance L from the standby position. A rotary encoder 10 for detecting the machine rotation angle is connected to the image processing circuit 8. A display device 12 is connected to the image processing circuit 8.

When weaving is started in accordance with the operation of the loom drive motor 9, the image pickup camera 2 moves along the rail 1,
The arrangement position of the warp yarns T near the cloth fell W ₁ is captured by the image pickup camera 2 as image information. The image processing circuit 8 performs image processing of only the image information near the beating time based on the machine base rotation angle information obtained from the rotary encoder 10. The circles in FIG. 3 represent areas captured as images by the imaging camera 2 near the beating time. In the vicinity of the beating time, the reed wing 7-2 of the modified reed 7 is close to the cloth fell W ₁ , and the reed wing 7-2 together with the warp T is obtained as image information. The image processing circuit 8 carries out a process of ascertaining the number of warp yarns T passed between the reeds 7-2 based on the image information near the beating time.

In this embodiment, the predetermined number of warp threads T to be passed between the reeds 7-2 is two. When the warp threading abnormality that the number of the warp threads T passed between the reeds 7-2 is one or three or more, the image processing circuit 8 causes the loom control computer C ₀ and the motor control circuit 11 to operate. On the other hand, a warp threading abnormality detection signal is output. The loom control computer C ₀ stops the loom drive motor 9 in response to the input of the warp threading abnormality detection signal, and the motor control circuit 11 returns the imaging camera 2 to the standby position in response to the input of the warp threading abnormality detection signal. The operation of the motor 5 is controlled as follows.

Since the presence or absence of the warp threading abnormality is determined during the operation of the loom, even if the warp threading state changes from the normal state to the abnormal state during the operation, the occurrence of the warp threading abnormality can be immediately detected. In this case, the warp due to the abnormal warp threading does not occur on the woven fabric W. When the warp breakage occurs, a warp breakage detection device (not shown) detects the warp breakage and the weaving is stopped. The cut warp threads are connected while the loom is not operating,
When passing the cut warp between the reeds, it may be mistakenly passed through a place other than the original position for passing the warp. Such a warp threading abnormality is also captured by the imaging camera 2 immediately after the weaving is resumed, and warps are hardly generated on the woven fabric W.

The image processing circuit 8 grasps the moving position L of the image pickup camera 2 when the image with the warp threading abnormality is captured based on the motor rotation angle information obtained from the rotary encoder 5-2 of the motor 5. The image processing circuit 8 outputs and displays the grasped movement position L on the display device 12 as the warp threading abnormal position L. By displaying the abnormal position of warp threading, the operator can easily recognize the abnormal position of warp threading, and the warp threading operation for achieving a normal warp threading state is facilitated.

Although the image pickup camera 2 is returned to the standby position when the weaving is stopped, the image pickup camera 2 may be stopped at the moving position corresponding to the abnormal position of warp threading. The stop position of the image pickup camera 2 serves as a guide for grasping the abnormal position of the warp threading. Further, when the weaving is resumed after the work of repairing the abnormal warp threading, the imaging camera 2 inspects the abnormal position of the warp threading. Since the deformed reed 7 starts swinging from the stop position immediately before the beating, it is possible to immediately grasp the warp threading error due to the repair work.

Next, a second embodiment of FIGS. 4 and 5 will be described. In this embodiment, the light projecting optical fiber 14 and the light receiving optical fiber 15 are vertically arranged with the woven cloth W interposed therebetween. The tips of the optical fibers 14 and 15 forming a pair in the upper and lower directions face the yarn direction of the warp T.
Is directed toward the warp T near the cloth fell W ₁ . The upper and lower optical fibers 14 and 15 are arranged corresponding to each reed wing 7-2. The optical fibers 14 and 15 are outside the swing region of the deformed reed 7.

The light projecting optical fiber 14 is supplied with light from the light projecting device 16, and the light projecting optical fiber 14 projects light onto the warp thread that has passed through one gap between the reed blades 7-2. The light receiving optical fiber 15 captures the reflected light from the warp thread that has passed through one gap between the reed wing 7-2. The light receiving element 17 converts the light captured by the light receiving optical fiber 15 into an electric signal. The signal processing circuit 18 determines whether there is a warp threading abnormality based on the strength of the electric signal.

Also in this embodiment, it is possible to immediately detect the warp threading abnormality after the occurrence of the warp threading abnormality.
The warp yarn inspection device using the optical fibers 14 and 15 has the advantages of a simple structure with no moving parts and low cost.

Next, a third embodiment shown in FIGS. 6 and 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. The warp detector 19 supported on the lower end of the guide body 3 moves along the rail 1 by the reciprocating circulation of the endless belt 4. The warp detector 19 is composed of a reflection type photoelectric sensor type image sensor and has a linear detection area extending over a predetermined length in the weaving width direction. The movement path of the warp detector 19 is above the woven cloth W in the vicinity of the cloth fell W ₁ and outside the swing area of the deformed reed 7, and the detection area of the warp detector 19 is the arrangement position of the warp threads T in the vicinity of the cloth fell W _1. Is.

The warp detector 19 has a warp detection control circuit C.₁
Is connected, and the detection signal from the warp detector 19 is
Thread detection control circuit C₁Entered in. Reference signal creation control cycle
Road C ₂A density information input device 20 is connected to. Dense
Degree information input device 20 inputs reed densities and warp densities
Things. Reference signal creation control circuit C₂Is the reed density
And a pair of reference signals G based on the warp density₁, G₂Create
I do. Reference signal creation control circuit C₂Is the reference signal G created
₁, G₂Comparing control circuit C₃Send to. Comparison control circuit
C₃Is a reference signal generation control circuit C₂Reference signal obtained from
G₁, G₂And warp detection signal obtained from the warp detector 19
Compare with.

The waveform P in FIG. 7 is a voltage signal output from the warp detection control circuit C ₁ . The value of the voltage signal P corresponds to the value of the current signal obtained by the warp detector 19. Figure 7
When the number of warp yarns between the reeds 7-2 is not a predetermined number (two in this embodiment) as shown in Fig. ₅ , the values of the waveforms P ₁ and P ₂ representing the presence of warp yarns are the reference signals G ₁ and G _2. Outside the range of values for. In this case, the comparison control circuit C ₃ outputs a warp threading abnormality detection signal to the motor control circuit 11 and the loom control computer C ₀ . The motor control circuit 11 immediately stops the operation of the motor 5. In this embodiment as well, similar to the second embodiment, it is possible to immediately detect the warp threading abnormality after the warp threading abnormality occurs.

Next, a fourth embodiment shown in FIGS. 8 to 10 will be described. The same components as those in the first embodiment are designated by the same reference numerals,
Detailed description thereof will be omitted. As shown in FIG. 8, the guide body 3
The warp detector 21 supported by the endless belt 4 reciprocates along the rail 1 by the reciprocating circulation of the endless belt 4. Warp detector 2
1, a light projector 22, a light receiver 23, an optical system 24,
25 are accommodated. The light projected from the light projector 22 illuminates the warp T near the cloth fell W ₁ through the optical system 24, and the light reflected from the warp T is received by the light receiver 23 through the optical system 25.

As shown in FIG. 8, the light receiver 23 includes a pair of light receiving elements 26 and 27, and the light receiving elements 26 and 27 are arranged side by side in the weft Y direction of the woven fabric W. Reference numeral 26-1 shown in FIG. 9 represents a detection range on the warp yarn T row by the light receiving element 26, and 27-1 represents a detection range on the warp yarn T row by the light receiving element 27. The warp threads T are passed between the reed blades 7-2 of the deformed reed 7 in a predetermined number of units, and the widths of the detection ranges 26-1 and 27-1 in the weft Y direction are set to the pitch of the reed blades 7-2. Has been done. The widths of the detection ranges 26-1 and 27-1 in the warp yarn T direction are several times larger than the width of the weft yarn Y direction.

The light receiving elements 26 and 27 convert the received light into an electric current.
Convert to. The light receiving element 26 converts the converted current signal into a current-voltage.
The light receiving element 27 outputs the converted current signal to the conversion circuit 28.
Output to the current-voltage conversion circuit 29. Current-voltage conversion times
Paths 28 and 29 convert the converted current signal to the voltage signal S₁, S₂Strange
The data is converted and output to the difference calculation circuit 30. The difference calculation circuit 30 is
Voltage signal S input from the current-voltage conversion circuits 28 and 29
₁, S₂Calculate the difference between the values of. In this calculation, the voltage signal S
₁From the value of voltage signal S₂Is subtracted. Difference calculation circuit
30 is the difference signal ΔS obtained by calculation₁₂To the comparison circuit 31
Output. The comparison circuit 31 receives the input difference signal ΔS₁₂And in advance
Reference value V set by reference value setting circuits 32 and 33
₁, V₂Compare with. Reference value V₁Is positive, reference value V₂Is
Is negative. Difference signal ΔS₁₂Value of range [V₁, V₂] From
When it comes off, the comparison circuit 31 determines the loom control computer C.
₀A warp threading abnormality detection signal is output to. Difference signal ΔS₁₂of
Value is in the range [V₁, V₂], The comparison circuit 31
Is the loom control computer C ₀Warp threading abnormality detection signal
Do not output. Comparison circuit 31 and reference value setting circuits 32 and 3
3 is a means for determining the presence or absence of a warp threading abnormality.

Curve E in FIG. 10 (a)₁Is current-voltage conversion
The voltage signal S output from the circuit 28 ₁Is shown in FIG.
Curve E of (b)₂Is output from the current-voltage conversion circuit 29.
Voltage signal S₂Represents Curve E in FIG. 10 (c)₃Is a song
Line E₁Curve E from the value of₂Difference signal Δ obtained by subtracting the value of
S₁₂Represents Square wave E in FIG. 10 (d)_Four, E_Five, E₆Is
The warp threading abnormality detection signal output from the comparison circuit 31 is displayed.
You. The horizontal axis in each of FIGS. 10A to 10D is time.
Represents The vertical axes in FIGS. 10A to 10C are all
Represents voltage.

As shown in FIG. 8, three warps T are passed between certain reeds 7-2, and one warp T is placed between adjacent reeds 7-2.
It has been passed on. Predetermined number (2) between other reeds 7-2
The warp thread T is threaded. The protrusion E _1-1 of the curve E ₁ is
This shows a warp threading abnormality detected by the light receiving element 26 of the warp threads between the three threaded reeds 7-2. Protrusion E of curve E ₂
Reference numeral _2-1 represents a warp threading abnormality in which the light receiving element 27 detects the warp thread between the three reed blades 7-2. The falling portion E _1-2 of the curve E ₁ indicates a warp threading abnormality in which the light receiving element 26 detects the warp thread between the single reed wing 7-2. The protruding portion E _2-2 of the curve E ₂ represents a warp threading abnormality in which the light receiving element 27 detects the warp thread between the single threaded reeds 7-2. The time difference between the protruding portions E _1-1 and E _{2-1 and} the time difference between the falling portions E _1-2 and E _2-2 are obtained by arranging the light receiving elements 26 and 27 moving in the weft Y direction in the weft Y direction. Occurs.

The projection E _3-1 of the curve E ₃ is the projection E _1-1
And the substantially flat portion of the curve E ₂ corresponding to the time region of the protrusion E _1-1 . The decline E _3-2 of the curve E ₃ is
It is the difference between the decline part E _2-2 of the curve E ₂ corresponding to the time domain of the protrusion E _2-1 protrusions E _2-1 Toko. Fall portion of curve E ₃ E _3-3 is the difference between the substantially flat portion of the curve E ₁ corresponding to the time domain of the fall portion E _2-1 Toko fall portion E _2-1. The time width t ₁ of the square wave E ₄ corresponds to the time width of the protrusion E _{3-1 that} exceeds the reference value V ₁ to the positive side. Time width t of square wave E _5
2 corresponds to the time width of the falling portion E _{3-2 that} exceeds the reference value V ₂ to the negative side, and the time width t ₃ of the square wave E ₆ is the falling portion E _{3 that} exceeds the reference value V ₂ to the negative side. Corresponds to a time span of ₃ .

Detection ranges 26-1, 2 of the light receiving elements 26, 27
The range of 7-1 in the direction of weft Y is set to about the pitch of reed wing 7-2.
I have decided. Therefore, the light receiving elements 26 and 27 receive light.
The amount is different between the warp threading abnormal part and the warp threading normal part.
Curve E₁, E₂Protrusion E _1-1, E_2-1And falling
E_1-2, E_2-2Voltage signal S as shown in₁, S₂Fluctuation of
Is obtained.

Square wave E_Four, E_Five, E₆Represented by
The warp threading abnormality detection signal is output by the light receiving elements 26, 27.
Voltage signal S obtained from₁, S₂Difference signal ΔS₁₂And reference value
V₁, V₂It is determined based on the comparison result with. Warp inspection
The presence of illumination light other than the inspection device or the presence of cotton wool
Disturbance is the voltage signal S₁, S₂Change. That is, the voltage
Signal S₁, S₂Changes caused by disturbances
It Such a voltage signal S₁, S₂Changes in warp thread
The voltage signal S is not reflected correctly.₁, S₂And criteria
Whether there was a warp threading abnormality was judged based on the result of comparison with the value.
In some cases, false inspections will occur. However, the voltage signal S₁, S₂
Difference signal ΔS₁₂Now let's go into each voltage signal
The change caused by the disturbance is almost offset. Therefore,
Difference signal ΔS ₁₂Accurately reflects the presence or absence of warp threading
The difference signal ΔS₁₂And reference value V₁, V₂Compare with warp
Improve the accuracy of the warp inspection, which is the detection of the presence or absence of threading abnormality.

The warp threading abnormality caused by the warp entanglement during the operation of the loom is almost always the warp threading abnormality state as shown in FIG. In the present embodiment, which takes the difference between the voltage signal values obtained by detecting the warp thread passed between the adjacent reed blades 7-2, as shown by the falling portion E _3-2 in FIG. A difference signal of the difference value is obtained. Such signal processing facilitates the setting of the reference values V ₁ and V ₂ in detecting the presence or absence of the warp threading abnormality, and enables the presence or absence of the warp threading abnormality with high accuracy.

Inventions other than those described in the claims that can be understood from the above-described embodiments will be described below along with their effects. (1) A plurality of photoelectric sensors arranged in the weft yarn direction,
A difference calculation means for calculating a difference between an electric signal of at least one of the plurality of photoelectric sensors and an electric signal of another photoelectric sensor, and whether to output a warp threading abnormality detection signal based on a calculation result of the difference calculation means A warp inspection device in a loom, comprising: a determining unit that determines whether or not the yarn is included.

It is possible to detect the presence or absence of a warp threading abnormality with high accuracy by eliminating the influence of disturbance.

[0038]

As described in detail above, according to the present invention, a warp detector having a detection area at the warp arrangement position near the cloth fell is disposed outside the swinging area of the reed, and the warp detection is performed. Since the time is set to be during the loom operation, it is possible to immediately detect the warp threading abnormality after the occurrence of the warp threading abnormality and eliminate the defect on the woven fabric due to the warp threading abnormality with respect to the reed.

[Brief description of drawings]

FIG. 1 is a side view of a first embodiment embodying the present invention.

FIG. 2 is an enlarged perspective view showing a warp threading state between the reed blades.

FIG. 3 is a front view showing a warp threading state between the reed blades.

FIG. 4 is a side view of the second embodiment.

FIG. 5 is an enlarged perspective view of a main part.

FIG. 6 is a side view of the third embodiment.

FIG. 7 is a front view showing a warp threading state between the reeds.

FIG. 8 is a front view of the fourth embodiment.

FIG. 9 is an enlarged plan view showing a detection range of a light receiving element.

FIG. 10 is a graph showing signal processing.

[Explanation of symbols]

2 ... Imaging camera that serves as warp detector, 7 ... Deformed reed, 7-2 ...
Reeds, 14, 15 ... Optical fibers forming the warp detector, 19, 21 ... Warp detector.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G01N 21/89 C

Claims (3)

[Claims] 1. A weaving machine for driving a weft thread, which has been inserted into the opening of the warp thread, into the cloth fell of a woven cloth by a reed, and a warp detector having a detection area at a warp arrangement position near the cloth fell. It is arranged outside the moving area, and whether or not there is a warp threading abnormality of the warp threaded through the reed is grasped based on the detection information from the warp detector, and the detection timing of this warp thread detection information is set to be during the loom operation. Warp inspection device for loom. 2. The warp yarn inspection device in a loom, wherein the warp yarn detector according to claim 1 is an image pickup camera, and the detection region of the image pickup camera includes a reed wing arranging region near the beating time. 3. The warp yarn inspection device for a loom, wherein the warp yarn detector according to claim 1 comprises a light projecting optical fiber and a light receiving optical fiber which are arranged corresponding to the gaps between the reeds of the reed.