JP5391928B2 - Abnormality detection method of weft insertion defect detection device - Google Patents

Description

  The present invention relates to an abnormality detection method for diagnosing whether or not there is an abnormality in the second weft detection device in a weft insertion failure detection device in which first and second weft detection devices are provided outside the weaving width of the loom.

  In the loom, in addition to the first weft detection device arranged at a position where the weft thread that has been normally inserted can be reached, the second weft detection device is arranged at a position where the weft yarn cannot be reached. Detection devices are known. The second weft detection device detects a weft insertion failure (hereinafter collectively referred to as a barrel break) such as a cut out of the weft cut in the middle of the weaving width or a blowout where the tip of the weft is cut. Have Therefore, as long as weft insertion is performed normally, the weft detection signal is not transmitted from the second weft detection device.

  For this reason, even if the second weft detection device cannot detect the weft due to, for example, disconnection, dirt due to adhesion of dust or fluff, or aged deterioration of the detection element, the control device cannot recognize this. . When the second weft detection device is in an abnormal state, when a torso cut occurs during the weaving operation of the loom, the second weft detection device cannot detect the torso cut, and therefore a weaving wound due to the torso cut occurs. There is a problem that the weaving operation is continued in the state and the quality of the woven fabric is remarkably lowered. In addition, the cause of the torsion is often due to the lack of adjustment of the type of weft and the air injection pressure.

  Patent Document 1 discloses an invention for monitoring the function of the second weft detection device. In Patent Document 1, the second weft detection device is referred to as a second light barrier and described. The invention disclosed in Patent Document 1 aims to eliminate the illegal function during the weaving process by continuously monitoring the function of the second light barrier and to avoid the production of defective fabrics. It is configured as follows. The second light barrier is blocked by a protrusion provided on the fabric table (corresponding to a fer plate) entering the weft insertion path every time it is beaten. If a signal is generated every beat due to the interruption of the second light barrier, the loom control device determines that the second light barrier is functioning properly and proceeds with the weaving process.

Japanese Patent Laid-Open No. 10-317261

  In the invention of Patent Document 1, it is necessary to configure the fabric table as a special component provided with the second light barrier blocking projection, so that general-purpose components cannot be used, and the fabric table is complicated. There is a problem that it must be a structure. In addition, the loom control device performs a work for detecting the presence / absence of a signal from the second light barrier and a work for determining whether the second light barrier is normal or abnormal in addition to the processing work for functions necessary for weaving every time the hammering is performed. Since this is necessary, there is a problem that the entire processing program becomes complicated and a load is applied to the loom control device.

  The present invention provides an abnormality detection method capable of diagnosing the presence or absence of abnormality of the second weft detection device with a simple configuration.

  In the present invention of claim 1, the first weft detection device is disposed at a position where the weft thread drawn out from the weft length measuring device by the weft insertion nozzle and normally inserted into the warp opening can be reached, In an abnormality detection method of a weft insertion failure detection device in which a second weft detection device is disposed at a position where a normal weft insertion cannot reach, the weft length measurement of the weft length measurement device based on a long weft insertion command signal When a weft of a length that can reach the second weft detection device is inserted by controlling the amount, and a weft detection signal is transmitted from the second weft detection device after weft insertion, the second weft detection device When the diagnosis is normal and there is no weft detection signal, the second weft detection device diagnoses an abnormality.

  According to the first aspect of the present invention, it is possible to diagnose the presence or absence of abnormality of the second weft detection device with only a simple configuration of controlling the weft insertion length of the weft, and a special mechanical diagnosis mechanism is provided. It is not necessary to provide it in the existing loom and can be easily implemented. In addition, since the control of the weft insertion length can be realized by software, it is not necessary to consider repairs or replacements due to failure or malfunction or aging deterioration of the mechanism as compared with a mechanical diagnosis and control mechanism. . In the present invention, the operation of the loom is a concept including a weaving operation of the loom, a weaving operation of the loom, and an inching operation of the loom that temporarily operates while the loom is stopped.

  The present invention according to claim 2 sets either one of the specified number of weft insertions in the weaving operation of the loom or the specified elapsed time including when the loom is stopped in the control device, and the long weft insertion command signal is It is transmitted when the number of times of insertion or the elapsed time has reached the specified number of times of insertion or the specified elapsed time. Therefore, there is no need to frequently perform long weft insertion for diagnosis of the second weft detection device, and basically it is sufficient to perform one long weft insertion at the time of diagnosis, which may affect the weaving operation. Few.

  According to a third aspect of the present invention, the specified weft insertion count and the specified elapsed time are both set in a control device, and the long weft insertion command signal includes the weft insertion count or elapsed time and the specified weft insertion count and the It is transmitted when either one of the specified elapsed times is reached. Therefore, there is a possibility that the second weft detection device may malfunction while the loom is stopped or when the loom is being transported. However, since the elapsed time continues to be counted even when the loom is not operating, it is always at an appropriate timing. The second weft detection device can be diagnosed.

  According to a fourth aspect of the present invention, when the second weft detection device transmits a weft detection signal while less than the specified number of weft insertions or the specified elapsed time, the number of weft insertions and the elapsed time are counted. It is characterized by returning to zero. Therefore, for example, if a weft insertion failure such as a torsion is detected, it can be confirmed that the second weft detection device is normal. Therefore, by counting the number of weft insertions or the elapsed time again from zero, an extra long Weft insertion can be eliminated.

  According to a fifth aspect of the present invention, when the second weft detection device is diagnosed as normal, it is determined whether or not there is a setting for stopping the operation of the loom. The operation is stopped. Accordingly, it is possible to selectively set whether or not the loom is stopped during normal diagnosis of the second weft detection device, and the loom can be operated efficiently.

  According to a sixth aspect of the present invention, when the long weft insertion command signal is transmitted, the loom stop operation by the weft detection signal of the second weft detection device is invalidated, and after the diagnosis of the second weft detection device Before starting the operation of the loom, the loom stop operation by the weft detection signal of the second weft detection device is validated. Accordingly, it is possible to eliminate the wasteful stop of the loom during diagnosis of the second weft detection device.

  The present invention according to claim 7 is characterized in that the long weft insertion command signal is transmitted based on a weaving operation command after machine setting. Therefore, since the woven fabric at the time of weaving operation is not used as a product, the quality of the long weft insertion is irrelevant. Therefore, the diagnosis of the second weft detection device should be performed without stopping the loom. Can do. Further, when the frequency of machine work is high, it can be set to perform long weft insertion only during the weaving operation, and control for diagnosing the second weft detection device during the weaving operation becomes unnecessary.

  According to the present invention, it is possible to easily diagnose the presence or absence of an abnormality in the second weft detecting device only by temporarily controlling the weft length measuring device in order to change the weft length in the weft insertion.

It is a schematic plan view of the loom provided with the weft insertion defect detection device. It is the first half flowchart which shows 1st Embodiment. It is a latter half flowchart which shows 1st Embodiment. It is a flowchart which shows 2nd Embodiment. It is a flowchart which shows the basic idea of this invention.

(First embodiment)
The first embodiment will be described with reference to FIGS. In FIG. 1, the outline of each part of an air jet loom (hereinafter simply referred to as a loom) embodying the present invention will be described. The weft Y drawn from the yarn feeding bobbin 1 is wound around the drum 4 by the yarn winding tube 3 of the weft measuring device 2 and is stored in a certain amount by engagement with the electromagnetic locking pin 5. The locking pin 5 is connected to the control device 6 by a signal line K1, and the photoelectric sensor 7 is connected to the control device 6 by a signal line K2.

  The locking pin 5 performs a weft releasing operation according to a command transmitted from the control device 6 at a weft insertion start timing programmed in the control device 6. The photoelectric sensor 7 detects the consumption amount of the weft Y on the drum 4 and transmits it to the control device 6. When the control device 6 receives a detection signal corresponding to a predetermined consumption amount of the weft Y from the photoelectric sensor 7, it sends a command signal to the locking pin 5 to perform the weft locking operation. The timing at which the weft locking operation of the locking pin 5 based on the signal from the photoelectric sensor 7 is the weft insertion end timing.

  When the weft insertion start timing comes during the operation of the loom, the compressed air is first jetted from the weft insertion nozzle 8, and then the locking pin 5 releases the weft Y. Accordingly, the weft Y is injected into the warp opening formed by the warp T, and is inserted while being assisted by the air flow injected from the plurality of auxiliary nozzles 9 disposed along the weft path. Although not shown, the weft path is formed by a weft guide groove of deformed rods arranged in parallel on the sley 10 in the weft insertion direction.

  A first weft detection device 11 and a second weft detection device 12 that constitute a weft insertion failure detection device are disposed on a slay 10 located outside the woven fabric W on the opposite side to the weft insertion nozzle 8. The signal lines K3 and K4 are connected to the control device 6 respectively. The first weft detection device 11 is disposed at a position where the weft tip Y1 that has been normally inserted can be reached, and when the weft Y is normally inserted during the weaving operation of the loom, the control device 6 sends a weft detection signal. Call to. The control device 6 receives the weft detection signal from the first weft detection device 11, confirms normal weft insertion, and allows the weaving operation to continue.

  The second weft detection device 12 is disposed at a position where the weft front end Y1 that is normally inserted cannot be reached, and does not transmit a weft detection signal as long as the weft Y is normally inserted. However, when the body breakage occurs, the weft Y reaches the position of the second weft detection device 12 like the weft tip Y2 indicated by the dotted line, or the second weft detection is performed by the air flow injected from the auxiliary nozzle 9. The weft tip Y2 passes through the position of the device 12. For this reason, the second weft detection device 12 detects the weft tip Y2 and sends a detection signal to the control device 6. The control device 6 receives the weft detection signal from the second weft detection device 12 and determines that the weft leading end Y2 is out of the body. Therefore, the control device 6 sends a loom stop command and stops the loom.

  Although not shown, cutters are provided at the weft end (woven fabric end) on the weft insertion nozzle 8 side and the weave end on the opposite side of the weft insertion nozzle 8, and at an appropriate timing after the weft insertion is completed. Cut the weft Y. The function panel 13 includes an input unit 14 and a display unit 15 having data input keys and various switches, and is connected to the control device 6 through a signal line K5. The rotary encoder 16 inputs the origin signal and the rotation angle signal during one rotation of the loom to the control device 6 through the signal line K6.

  In the control device 6, in addition to various programs for executing the weaving operation, a program for detecting the presence or absence of abnormality of the second weft detection device 12 is set and stored. Before explaining the configuration, the basic idea of the abnormality detection method in the present invention will be described with reference to FIG. The long weft insertion shown in the figure means that the weft measuring device 2 controls the weft Y having a length that can reach the position of the second weft detecting device 12 like the weft tip Y2 in FIG. It is to insert.

  In step 1, the controller 6 detects the presence or absence of a long weft insertion command signal. When a long weft insertion command signal is detected, weft insertion by the weft insertion nozzle 8 is started and the weft length measurement by the weft length measuring device 2 is controlled for long weft insertion. Step 2 detects whether a weft having a long weft insertion length has been measured (whether the photoelectric sensor 7 has detected a consumption corresponding to the long weft insertion length of the weft Y on the drum 4). When the control device 6 detects the long weft insertion length, it ends the weft insertion. Step 3 detects the presence or absence of a weft detection signal from the second weft detection device 12. When the control device 6 receives the weft detection signal of the second weft detection device 12, the controller 6 diagnoses that the second weft detection device 12 is normal, and when the control device 6 does not receive the weft detection signal, the second weft detection device 12 is abnormal. Diagnose it. When the control device 6 diagnoses the abnormality of the second weft detection device 12, it sends a loom stop signal and stops the loom.

  Next, the configuration of the abnormality detection method based on the first embodiment in which the basic idea of FIG. 5 is implemented will be described with reference to FIGS. The control device 6 is programmed with software for executing the abnormality detection method, and the following contents are set in advance. (1) In the control device 6, a specified number of weft insertions and a specified elapsed time are set. The control device 6 counts the number of weft insertions during the weaving operation, and also counts the elapsed time including all during the weaving operation, when the loom is stopped, during the loom maintenance and during the loom transport.

  (2) In response to a count-up signal generated when either the number of weft insertions or the elapsed time reaches a specified value, the control device 6 transmits a long weft insertion command signal and pays each count value to zero (count value) To zero). In addition, the count value of the number of weft insertions and the elapsed time count are zeroed when the second weft detection device 12 transmits a weft detection signal due to a shortage to the control device 6 while neither reaches the specified value. When the specified elapsed time has elapsed while the loom is stopped, a long weft insertion command signal is transmitted from the control device 6 during the weaving operation by restarting the loom thereafter. The transmission timing of the long weft insertion command signal may be set simultaneously with the restart of the loom, or may be set at an appropriate timing after the restart. (3) The second weft detection device 12 transmits a weft detection signal when a trunk break occurs, and the control device 6 is set to stop the loom based on the weft detection signal of the second weft detection device 12. However, the stop operation of the loom is invalidated when the long weft insertion command signal is transmitted.

  (4) When the control device 6 receives the detection signal of the photoelectric sensor 7 three times, for example, the control of the length measurement in the weft length measuring device 2 is determined as the length of the weft Y during normal weft insertion, and the locking pin This is performed by instructing the weft lock operation to No.5. When the long weft insertion command signal is transmitted, the control device 6 receives the detection signal of the photoelectric sensor 7 four times, thereby determining the length of the weft Y at the time of long weft insertion, Command the operation.

  (5) When the long weft insertion is performed, the control device 6 diagnoses whether the second weft detection device 12 is normal or abnormal based on the presence / absence of a signal from the second weft detection device 12. When the second weft detection device 12 is normal, a selection item is set in the control device 6 to stop the loom or continue the weaving operation. This loom stop setting can be freely made based on the user's weaving management standards in the weaving factory (for example, whether or not the long weft insertion weft Y is removed from the weaving cloth at the time of abnormality diagnosis of the second weft detecting device 12). Is set. (6) When the loom stops during long weft insertion, the function panel 13 indicates that the stop is based on the diagnosis of the second weft detection device 12 such as normal diagnosis or abnormal diagnosis on the display unit 15 and the second weft. Whether the detection device 12 is normal or abnormal is displayed.

  The abnormality detection method in the first embodiment configured as described above will be described below. During the weaving operation of the loom, in step 1, the control device 6 counts the number of weft insertions and the elapsed time at the same time. In Step 2, when the second weft detection device 12 transmits a weft detection signal due to a weft cut while neither the number of weft insertions nor the elapsed time reach the specified value, the loom stops and weft insertion occurs for the weaving cut process. Zero the count of count and elapsed time. When the processing of the weft cut weft ends, the loom is restarted and the weaving operation is started.

  If no torso cut occurs, the number of weft insertions and the elapsed time are continuously counted. When the count value of either the number of weft insertions or the elapsed time reaches a specified value, in Step 3, the control device 6 transmits a long weft insertion command signal. In the weft insertion after the long weft insertion command signal is transmitted, the loom stop operation by the weft detection signal of the second weft detection device 12 is invalidated. At the weft insertion timing, first, the weft insertion nozzle 8 injects an air flow, and then the locking pin 5 releases the weft Y on the drum 4 to start weft insertion.

  The control device 6 changes the count number of the detection signal of the photoelectric sensor 7 from the usual 3 times to 4 times in order to control the weft length measurement based on the long weft insertion command signal. The photoelectric sensor 7 transmits a detection signal to the control device 6 every time the optical path is interrupted by the weft Y drawn from the drum 4. In step 4, when the control device 6 counts the detection signal of the photoelectric sensor 7 four times, the control device 6 determines that the weft Y having a long weft insertion length has been measured, and instructs the locking pin 5 to perform the weft locking operation. The locking pin 5 locks the weft Y on the drum 4 and the weft insertion ends.

  In step 5, the control device 6 detects the presence or absence of a weft detection signal from the second weft detection device 12, and if there is a weft detection signal, the second weft detection device 12 diagnoses that it is normal, and the weft detection signal is If not, the second weft detection device 12 diagnoses an abnormality. Step 6 confirms whether the loom is set to stop when the second weft detection device 12 is diagnosed as normal. If there is a setting for stopping, the loom is stopped and the point of the diagnosis stop and the point that the diagnosis result is normal are clearly shown on the display unit 15 of the function panel 13. After the loom stops, when the predetermined work is finished, the loom is restarted. At the same time, the weft insertion count and elapsed time count are zeroed and the loom stop operation by the weft detection signal of the second weft detection device 12 is effective. And weaving operation is resumed. If there is no stop setting, the weft insertion count and the elapsed time count value are zeroed, and the weaving machine stop operation by the weft detection signal of the second weft detection device 12 is validated to continue the weaving operation.

  On the other hand, if the second weft detection device 12 is diagnosed as abnormal in step 5, the loom is immediately stopped. The display unit 15 of the function panel 13 clearly indicates that the diagnosis is stopped and the diagnosis result is abnormal. Thereafter, the second weft detection device 12 is inspected and repaired. When the abnormality repairing operation of the second weft detection device 12 is completed and a weaving operation command for the loom is subsequently issued by the operator's operation, the control device 6 pays zero the weft insertion count and elapsed time count value. The weaving operation is performed by enabling the loom stop operation by the weft detection signal of the two weft detection device 12.

The first embodiment described above has the following operational effects.
(1) Since it is possible to detect the presence or absence of an abnormality in the second weft detection device 12 only by temporarily performing long weft insertion, there is no need to prepare another special device.
(2) Since the presence or absence of abnormality of the second weft detection device 12 can be detected only by software programmed in the control device 6, the configuration is simple.

(Second Embodiment)
The second embodiment shown in FIG. 4 is obtained by changing the transmission timing of the long weft insertion command signal in the first embodiment. The same reference numerals are given to the same components as those in the first embodiment, and details are shown. The detailed explanation is omitted. In the second embodiment, the long weft insertion is performed at the time of weaving operation after completion of the machine work performed when the fabric specification is changed or when the warp T is exhausted. The control device 6 is set so that a weft operation command transmitted by an operator's switch operation or the like is programmed as a long weft insertion command signal and long weft insertion is started.

  With reference to FIG. 4, the abnormality detection method of the 2nd weft detection apparatus 12 in 2nd Embodiment is demonstrated. When the predetermined work is completed after the start of the mechanism, the mechanism is completed. In step 1, when the weaving operation command is transmitted by the operator's operation, the control device 6 determines that the long weft insertion command signal is transmitted. At this stage, the loom stop operation by the weft detection signal of the second weft detection device 12 is invalidated, and long weft insertion in the weaving operation is started. In order to control the weft length measurement for long weft insertion, the control device 6 changes the number of detection signals received from the photoelectric sensor 7 of the weft length measurement device 2 from 3 to 4 in the normal weaving operation. .

  In step 2, when the control device 6 receives the detection signal transmitted from the photoelectric sensor 7 four times, it is determined that the weft Y having the long weft insertion length has been measured, and the weft locking operation is commanded to the locking pin 5. To do. The weft insertion ends when the locking pin 5 locks the weft Y on the drum 4. In step 3, the control device 6 determines the presence or absence of a weft detection signal from the second weft detection device 12. If there is a weft detection signal, the control device 6 diagnoses that the second weft detection device 12 is normal, and detects the weft detection signal. If there is no, the second weft detection device 12 is diagnosed as abnormal.

  When it is diagnosed that the second weft detection device 12 is normal, the weaving operation is continued and the loom stop operation by the weft detection signal of the second weft detection device 12 is validated. When the weaving operation is performed for a predetermined time, it is stopped, and when the weaving operation command for the loom is subsequently issued by the operator's operation, the loom is started and the weaving operation is started.

  On the other hand, when it is diagnosed that the second weft detection device 12 is abnormal, the weaving operation is immediately stopped, the display unit 15 of the function panel 13 is stopped by diagnosis, and the diagnosis result is abnormal. Is displayed. When the abnormality repair work of the second weft detection device 12 is completed, the weaving operation is resumed, and thereafter, the same steps as when the second weft detection device 12 is diagnosed as normal are taken to reach the weaving operation of the loom. .

  In the second embodiment, since the woven fabric for the weaving operation is not used as a product, there is no problem even if weft Y longer than usual is woven by long weft insertion. Accordingly, the long weft insertion can be set continuously or intermittently as necessary, so that the second weft detection device 12 can be reliably diagnosed.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications are possible within the scope of the gist of the present invention, and can be implemented as follows.

(1) In the first embodiment, the long weft insertion performed when the number of weft insertions or the elapsed time reaches the specified value is not limited to one time, but may be intermittent even if set to be performed a plurality of times continuously. It may be set to be performed several times.
(2) In the first embodiment, in order to transmit the long weft insertion command signal, both the specified number of weft insertions and the specified elapsed time are set in the control device 6 and counted. Alternatively, it may be configured to set only.
(3) The setting for invalidating the stop operation by the weft detection signal of the second weft detection device 12 after step 3 in FIG. 2 is not necessarily required. In this case, even when a long weft is inserted, the loom is stopped when the second weft detecting device 12 detects the weft, and the setting for determining the loom stop in step 6 in FIG. 3 is not required.
(4) Although the first embodiment and the second embodiment have been described as being programmed independently, it is also possible to implement the program as a combination of both embodiments. That is, during the weaving operation of the loom, the long weft insertion is performed by counting up the number of weft insertions or the elapsed time, and the long weft insertion is also performed during the weaving operation of the loom after machine setting. In this case, after the diagnosis of the second weft detection device 12 by long weft insertion during the weaving operation, the number of weft insertions and the count value of the elapsed time are configured to be zero paid.

(5) The long weft insertion command signal may be transmitted based on an operation signal of a diagnostic switch (not shown) provided on the function panel 13 while the loom is stopped. In this case, the loom is inchingly operated by normal rotation or low-speed rotation, and steps similar to the flowchart of FIG. 5 are performed to diagnose the second weft detection device 12. Even if the diagnosis result of the second weft detection device 12 is normal or abnormal, it may be set to stop the loom, or in the normal case, it may be set to shift to the weaving operation as it is. The number of long weft insertions can be set to one or a plurality of times.
(6) The long weft insertion command signal may be configured to be transmitted based on a weaving machine restart signal after stoppage due to defective weft insertion or warp cutting, and the flowchart of FIG. 5 may be implemented. In this case, when the diagnosis result of the second weft detection device 12 is normal, the normal weaving operation by restarting is continued.
(7) The present invention can be implemented not only in the air jet loom shown in the first embodiment but also in other looms such as a water jet loom, a gripper loom, and a rapier loom.

2 Weft Measuring Device 5 Locking Pin 6 Control Device 7 Photoelectric Sensor 8 Weft Inserting Nozzle 9 Auxiliary Nozzle 11 First Weft Detection Device 12 Second Weft Detection Device 13 Function Panel 15 Display Unit

Claims (7)

The first weft detection device is disposed at a position where the weft thread drawn out from the weft length measuring device by the weft insertion nozzle and normally weft inserted into the warp opening can be reached. In the abnormality detection method of the weft insertion failure detection device in which the second weft detection device is disposed at a possible position,
Based on a long weft insertion command signal, a weft length of the weft length measuring device is controlled to insert a weft of a length that can reach the second weft detecting device,
After weft insertion, when the weft detection signal is transmitted from the second weft detection device, the second weft detection device is diagnosed as normal, and when there is no weft detection signal, the second weft detection device is diagnosed as abnormal. An abnormality detection method for a weft insertion defect detection device.   Either the specified number of weft insertions in the weaving operation of the loom or the specified elapsed time including when the loom is stopped is set in the control device, and the long weft insertion command signal includes the specified weft insertion time or elapsed time. The abnormality detection method for a weft insertion defect detection device according to claim 1, wherein the abnormality detection method is transmitted when the number of times or the specified elapsed time is reached. The specified number of weft insertions and the specified elapsed time are both set in the control device, and the long weft insertion command signal has reached either one of the specified number of weft insertions or the specified elapsed time. The abnormality detection method of the weft insertion defect detection device according to claim 2 , wherein the abnormality detection method is transmitted at the time.   When the second weft detection device transmits a weft detection signal while the number of weft insertions or elapsed time is less than the specified number of weft insertions or the specified elapsed time, the count of the number of weft insertions and the elapsed time is reset to zero. The abnormality detection method of the weft insertion defect detection device according to claim 2 or 3, characterized by the above.   When the second weft detection device is diagnosed as normal, it is determined whether or not there is a setting to stop the operation of the loom, and if there is a setting to stop, the operation of the loom is stopped even during normal diagnosis. The abnormality detection method of the weft insertion defect detection device according to any one of claims 1 to 4.   When the long weft insertion command signal is transmitted, the loom stop operation by the weft detection signal of the second weft detection device is invalidated, and after the diagnosis of the second weft detection device, the second weft operation is started. The abnormality detection method for a weft insertion failure detection device according to any one of claims 1 to 5, wherein a stop operation of the loom according to the weft detection signal of the weft detection device is validated.   The abnormality detection method for a weft insertion failure detection device according to any one of claims 1 to 6, wherein the long weft insertion command signal is transmitted based on a weaving operation command after machine setting.