阅读说明：本技术 喷气织机的异常检测方法和喷气织机 (Abnormality detection method for air jet loom and air jet loom ) 是由 牧野洋一 八木大辅 于 2021-04-13 设计创作，主要内容包括：提供检测副阀系统所产生的异常的喷气织机的异常检测方法和喷气织机。一种喷气织机的异常检测方法,上述喷气织机通过设置于纬纱走纱路径(150a)的走纱传感器(170)对被利用来自主喷嘴(142A、142B)和副喷嘴(160)的空气喷射经由纬纱走纱路径(150a)有选择地引纬的纬纱(YA、YB)的走纱状态进行检测,针对纬纱(YA、YB)从纬纱测长存积部(130A、130B)退绕的纬纱退绕时刻与基于走纱传感器(170)的纬纱检测信号的纬纱到达时刻之差亦即偏角,在分别针对多个纬纱(YA、YB)的偏角超过规定阈值时,检测副阀系统所产生的异常。(Provided are an abnormality detection method for an air jet loom, which detects an abnormality generated in a sub-valve system, and an air jet loom. An abnormality detection method for an air jet loom, wherein a yarn running sensor (170) provided in a weft yarn running path (150A) detects the running state of weft yarns (YA, YB) selectively fed through the weft yarn running path (150A) by air injection from main nozzles (142A, 142B) and an auxiliary nozzle (160), and an abnormality generated by an auxiliary valve system is detected when the deviation angle for each of a plurality of weft yarns (YA, YB) exceeds a predetermined threshold value with respect to a deviation angle, which is the difference between the weft unwinding timing at which the weft yarns (YA, YB) are unwound from weft yarn length measurement storage units (130A, 130B) and the weft arrival timing based on a weft detection signal from the yarn running sensor (170).)

1. An abnormality detection method for an air jet loom that detects a weft yarn running state of a weft yarn inserted through a weft yarn running path by air injection from a main nozzle and an auxiliary nozzle by a yarn running sensor provided in the weft yarn running path,

the abnormality detection method for an air jet loom is characterized in that,

a plurality of weft yarns respectively drawn by the air injection from any one main nozzle selected from the plurality of main nozzles are inserted through the common weft yarn running path by the air injection from the common sub-nozzle,

and a deviation angle that is a difference between an unwinding time at which the weft yarn is unwound from the weft yarn length measuring storage unit and a weft arrival time based on a weft detection signal of the yarn feeding sensor, wherein the deviation angle for each of the plurality of weft yarns exceeds a predetermined threshold value, and an abnormality occurring in the sub-valve system is detected.

2. The abnormality detection method for an air jet loom according to claim 1,

the yarn running sensor is a terminal sensor provided at a weaving end on a downstream side of a weaving width in the weft yarn running path, and a weaving width inner sensor provided on an opposite side of a center of the weaving width from the main nozzle and on an upstream side of the terminal sensor in the weft yarn running path,

and a knitting width inner slip angle as the slip angle of the position of the end sensor and the slip angle of the position of the knitting width inner slip angle, wherein the abnormality generated in the sub-valve system is detected when the knitting end slip angle and/or the knitting width inner slip angle for each of the plurality of weft yarns exceeds the predetermined threshold value.

3. The abnormality detection method for an air jet loom according to claim 2,

determining a region in which an abnormality has occurred in the sub valve system, based on a pattern of changes in the weaving end slip angle and the weaving width slip angle for each of the plurality of weft yarns.

4. The abnormality detection method for an air jet loom according to claim 2 or 3,

and detecting an abnormality in the sub-valve system on an upstream side of the in-knitting-width sensor when the knitting-width toe-in angle of the knitting-end toe-in angle and the knitting-width toe-in angle exceeds the predetermined threshold value.

5. The abnormality detection method for an air jet loom according to claim 2 or 3,

and detecting an abnormality in the sub-valve system on a downstream side of the knitting width inside sensor when the toe-off angle of the toe-off angle and the knitting width inside angle exceeds the predetermined threshold value.

6. The abnormality detection method for an air jet loom according to claim 2 or 3,

detecting an abnormality generated in the sub-valve system in front of the knitting width inside deflection angle and the knitting end deflection angle when the knitting width inside deflection angle and the knitting end deflection angle exceed the predetermined threshold values.

7. The abnormality detection method for an air jet loom according to any one of claims 1 to 6,

detecting the abnormality occurring in addition to the sub-valve system when the slip angle exceeds the predetermined threshold value for any of the plurality of weft yarns.

8. An air jet loom, wherein a yarn running sensor provided in a weft yarn running path detects the running state of a weft yarn inserted through the weft yarn running path by air injection from a main nozzle and an auxiliary nozzle,

the air-jet loom is characterized in that,

comprises a control unit for detecting an abnormality occurring in the sub-valve system,

the control unit detects an abnormality generated in the sub-valve system by executing the abnormality detection method according to any one of claims 1 to 7.

9. The air jet loom of claim 8,

further comprises a reporting unit for reporting the content instructed by the control unit,

the reporting unit reports the content of the abnormality of the sub-valve system detected by the control unit.

Technical Field

The present disclosure relates to an abnormality detection method for an air jet loom and an air jet loom.

Background

The air jet loom is configured to accumulate the weft yarn of the yarn feeding portion in the weft yarn length measuring accumulating portion, to unwind the accumulated weft yarn by the main nozzle to start weft insertion, to convey the weft yarn subjected to weft insertion by the sub-nozzle within the weaving width, and to end weft insertion.

Such an air jet loom controls the running of weft yarns by injecting compressed air from a main nozzle and an auxiliary nozzle, so that proper air injection is important. Therefore, it is necessary to appropriately manage a valve for supplying compressed air to the nozzle. For example, patent document 1 proposes a method of detecting a valve abnormality of an air jet loom based on the pressure reduction characteristic of a tank.

Patent document 1: japanese patent laid-open publication No. 2013-83016

As an abnormality of the valve of the air jet loom, there are two cases (1) in which the valve is kept open and the air is always ejected, and (2) in which the valve is not smoothly opened and the air is not ejected or is not fully opened. Since air leakage occurs when the valve of (1) is kept open, air leakage can be detected by the method of patent document 1.

On the other hand, in the case of (2), if the sub-valve for supplying air to the sub-nozzle is not properly opened, the air injection from the sub-nozzle is reduced. However, since the air injection pressure from the main nozzle is increased, the weft yarn may be run to the end of the weaving width.

Therefore, the presence of an abnormality is not easily detected with respect to the air injection from the sub-nozzle that affects the stability of weft insertion. Therefore, in the air jet loom, it is desirable to be able to detect an abnormality generated by the sub-valve system regardless of the control of the air injection from the main nozzle. Here, the sub valve system refers to the sub valve, the sub nozzle, and the piping thereof, and the abnormality occurring in the sub valve system refers to a failure occurring in the sub valve, the sub nozzle, and the piping thereof.

Disclosure of Invention

The present disclosure has been made to solve the above-described problems, and an object thereof is to provide an abnormality detection method for an air jet loom and an air jet loom, which can detect an abnormality generated in a sub-valve system.

In the abnormality detection method for an air jet loom according to the present disclosure, the air jet loom detects a state of weft yarn running of weft yarn inserted through a weft yarn running path by air injection from a main nozzle and an auxiliary nozzle by a yarn running sensor provided in the weft yarn running path, and in the abnormality detection method for an air jet loom, a plurality of weft yarns respectively drawn by air injection from any selected one of the plurality of main nozzles are inserted through the common weft yarn running path by air injection from the common auxiliary nozzle, and an abnormality generated by an auxiliary valve system is detected when an angle deviation for each of the plurality of weft yarns is outside a predetermined threshold range with respect to a difference between an unwinding timing at which the weft yarn is unwound from a weft yarn length measurement storage portion and a weft arrival timing based on a weft detection signal from the yarn running sensor, that is an angle deviation.

In the air jet loom of the present disclosure, a plurality of weft yarns respectively drawn out by air injection from any selected one of the plurality of main nozzles are inserted through a common weft yarn running path by air injection from a common sub-nozzle, and a running state of the plurality of weft yarns is detected by a running sensor provided in the weft yarn running path, the air jet loom is provided with a control unit that detects an abnormality of the sub-valve, and the control unit detects an abnormality generated by the sub-valve system when the deviation angle for each of the plurality of weft yarns is outside a predetermined threshold range with respect to a deviation angle that is a difference between a weft unwinding timing from the weft yarn length measurement storage unit and a weft arrival timing based on a weft detection signal of the running sensor. The monitoring device further comprises a reporting unit for reporting the content instructed by the control unit, and the reporting unit reports the content of the abnormality detected by the control unit.

The yarn running sensor is a weaving width inner deflection sensor provided on the downstream side of the weaving width of the weft yarn running path and on the opposite side of the main nozzle from the center of the weaving width and on the upstream side of the end sensor, and detects an abnormality generated in the sub-valve system when the weaving end deflection angle and/or the weaving width inner deflection angle for each of the plurality of weft yarns is outside a predetermined threshold range with respect to the weaving end deflection angle as a deflection angle at the position of the end sensor and the weaving width inner deflection angle as a deflection angle at the position of the weaving width inner deflection sensor.

An area where an abnormality occurs in the sub-valve system is determined based on the pattern of variation in the fabric end bias angle and the weave width internal bias angle for each of the plurality of weft yarns.

When the knitting width inner deflection angle of the knitting end deflection angle and the knitting width inner deflection angle is out of a predetermined threshold value range, an abnormality generated in the sub-valve system on the upstream side of the knitting width inner deflection angle sensor is detected.

When the fabric end deflection angle of the fabric end deflection angle and the fabric width inner deflection angle is out of a predetermined threshold range, an abnormality generated in the sub-valve system on the downstream side of the fabric width inner sensor is detected.

When the knitting width inner deflection angle and the knitting end deflection angle are out of the predetermined threshold value range, an abnormality generated in the sub valve system in front of the knitting width inner deflection angle sensor is detected.

When the deflection angle of any one of the plurality of weft yarns is out of a predetermined threshold range, an abnormality other than the sub-valve system is detected.

According to the abnormality detection method for an air jet loom and the air jet loom, it is possible to detect an abnormality generated in the sub-valve system.

Drawings

Fig. 1 is a block diagram showing a configuration of a weft insertion device of an air jet loom according to embodiment 1.

Fig. 2 is an explanatory view for explaining the deflection angle calculated from the yarn running curve and the unwinding curve in embodiment 1.

Fig. 3 is an explanatory diagram for explaining a change in the deflection angle in embodiment 1.

Fig. 4 is an explanatory diagram for explaining a change in the deflection angle in embodiment 1.

Fig. 5 is an explanatory diagram for explaining a change in the deflection angle in embodiment 1.

Fig. 6 is a flowchart showing the procedure of abnormality detection in embodiment 1.

Fig. 7 is an explanatory diagram for explaining a setting screen in embodiment 1.

Fig. 8 is an explanatory diagram for explaining the automatic input of the setting screen in embodiment 1.

Fig. 9 is an explanatory diagram for explaining a state after the automatic input of the setting screen in embodiment 1.

Fig. 10 is an explanatory diagram for explaining an information screen according to embodiment 1.

Fig. 11 is an explanatory diagram for explaining the warning screen in embodiment 1.

Fig. 12 is an explanatory diagram for explaining an information screen according to embodiment 1.

Fig. 13 is an explanatory diagram for explaining the warning screen in embodiment 1.

Fig. 14 is an explanatory diagram for explaining an information screen according to embodiment 1.

Fig. 15 is an explanatory view for explaining the warning screen in embodiment 1.

Fig. 16 is an explanatory diagram for explaining a setting screen in embodiment 1.

Fig. 17 is an explanatory diagram for explaining an information screen according to embodiment 1.

Fig. 18 is an explanatory diagram for explaining an information screen according to embodiment 1.

Description of the reference numerals

A weft insertion device; a control portion; a CPU; a functional panel; a yarn feeding portion; a yarn feeding portion; a weft length measuring and accumulating part; a weft length measuring and accumulating part; a storage drum; a 131b. 132a. 132b.. a weft yarn catch pin; a balloon sensor; a balloon sensor; a weft insertion nozzle; a weft insertion nozzle; a tandem nozzle; a series nozzle; a primary nozzle; a primary nozzle; a main regulator; a main regulator; a main tank; a primary tank; a series valve; a series valve; a main valve; a main valve; a brake; a 147b. Reed; a weft yarn path; a secondary nozzle; tubing; a secondary regulator; a tubing; a secondary canister; a secondary valve; tubing; a yarn feed sensor; an in-weave width sensor; an end sensor; MA... 1 st primary system; MB... 2 nd primary system; s.. a secondary system; SV.. a secondary valve system; TL.. weave width; YA.. weft yarns; YB..

Detailed Description

Hereinafter, embodiments of an air jet loom and an abnormality detection method thereof will be described with reference to the drawings. In the drawings, the same reference numerals are given to the same parts.

Embodiment 1.

First, the structure of weft insertion device 100 of the air jet loom according to embodiment 1 will be described with reference to fig. 1. Fig. 1 is a block diagram showing a configuration of a weft insertion device 100 of an air jet loom according to embodiment 1. In the present specification, the opposite side to the weft insertion direction is referred to as upstream and the weft insertion direction side is referred to as downstream with respect to the weft insertion direction in which the weft is inserted into the warp opening and conveyed. The source flow side is set as upstream and the opposite side to the source flow is set as downstream with respect to the flow direction of the compressed air.

[ Structure of weft insertion device 100 ]

The weft insertion device 100 shown in fig. 1 mainly includes a control unit 110, a 1 st main system MA, a 2 nd main system MB, a sub-system S, a reed 150, and a yarn running sensor 170. The weft insertion device 100 shown in fig. 1 is a 2-color weft insertion device having 2 main systems, i.e., a 1 st main system MA and a 2 nd main system MB, as a specific example, but may be a multicolor weft insertion device having 3 or more main systems.

The 1 st main system MA includes a yarn supplying portion 120A, a weft length measuring and accumulating portion 130A, and a weft insertion nozzle 140A. The 2 nd main system MB includes a yarn supplying portion 120B, a weft length measuring and accumulating portion 130B, and a weft insertion nozzle 140B. The control unit 110 is provided with a CPU111 and a function panel 112. The CPU111 performs various controls of the weft insertion device 100, and particularly detects an abnormality generated by the sub-valve system by executing an abnormality detection method. The function panel 112 is a report unit that reports an abnormality, has a display function and an input function, displays various information based on the contents instructed from the CPU111, and transmits the input information to the CPU 111. The function panel 112 is a reporting unit that reports the content of the instruction from the control unit and the content of the abnormality of the sub-valve system detected in the control unit.

In the 1 st main system MA, the yarn supplying section 120A is provided upstream of the weft length measuring and accumulating section 130A and holds the weft YA. The weft YA of the yarn supplying section 120A is drawn out by the weft length measuring accumulating section 130A.

The weft length measuring and accumulating unit 130A is provided with an accumulating drum 131A, a weft locking pin 132A, and a balloon sensor 133A. The accumulating drum 131A draws out the weft YA of the yarn supplying section 120A and accumulates the weft YA in a wound state. The weft yarn locking pin 132A and the balloon sensor 133A are disposed around the accumulating drum 131A. The balloon sensor 133A is arranged on the unwinding direction side of the weft YA with respect to the weft yarn locking pin 132A.

The weft yarn engagement pin 132A unwinds the weft yarn YA accumulated in the accumulation drum 131A at a loom rotation angle preset by the control unit 110. The timing at which the weft yarn YA is unwound by the weft yarn locking pin 132A is the weft insertion start timing.

The balloon sensor 133A detects the weft YA unwound from the accumulating drum 131A during weft insertion, and transmits a weft unwinding signal to the control section 110. When receiving the weft unwinding signal a predetermined number of times, the control section 110 activates the weft yarn locking pin 132A. In the present embodiment, three times are assumed as the number of times preset for receiving the weft unwinding signal. The weft yarn locking pin 132A locks the weft yarn YA unwound from the accumulating drum 131A, and ends the weft insertion.

The operating time of the weft yarn locking pin 132A for locking the weft yarn YA is set according to the number of windings required to store the weft yarn YA having a length corresponding to the knitting width TL in the storage drum 131A. In the present embodiment, the length of the weft YA wound around the accumulating drum 131A for three turns corresponds to the knitting width TL, and therefore, the control unit 110 is set to transmit an operation signal for locking the weft YA to the weft locking pin 132A when receiving a weft unwinding signal of the weft locking pin 132A three times. The weft detection signal of the weft yarn locking pin 132A is an unwinding signal of the weft yarn YA unwound from the accumulating drum 131A, and the control unit 110 recognizes this signal as the weft yarn unwinding timing based on the loom rotation angle signal obtained from the encoder.

The weft insertion nozzle 140A has a tandem nozzle 141A and a main nozzle 142A. The tandem nozzle 141A draws out the weft YA of the accumulating drum 131A by the jet of the compressed air. The main nozzle 142A picks up the weft YA to the weft yarn running path 150a of the reed 150 by the jet of the compressed air.

A brake 147A for braking the weft YA to be fed before the end of weft insertion is provided upstream of the tandem nozzle 141A.

The main nozzle 142A is connected to a main valve 146A via a pipe P146A. Main valve 146A is connected to main tank 144A via pipe P144A. The tandem nozzle 141A is connected to the tandem valve 145A via a pipe P145A. The series valve 145A is connected to a main valve 146A and a common main tank 144A via a pipe P144A. The main tank 144A is supplied and stored with compressed air supplied from an air compressor provided in a textile factory adjusted to a set pressure by the main regulator 143A through a pipe P143A.

In the 2 nd main system MB, as in the 1 st main system MA, the weft YB of the accumulating drum 131B is drawn out by the jet of the compressed air in the weft insertion nozzle 140B, and the weft YB is inserted into the weft running path 150a of the reed 150. Note that the same configuration and operation as those of the 1 st main system MA in the 2 nd main system MB will not be described in detail. In addition, in the 1 st and 2 nd main systems MA and MB, a plurality of systems can be combined into one system and used in common, such as the main regulators 143A and 143B and the main tanks 144A and 144B.

The reed 150 is disposed downstream of the weft insertion nozzle 140A of the 1 st main system MA and the weft insertion nozzle 140B of the 2 nd main system MB, is configured by a plurality of dents, and includes a weft yarn running path 150A. A plurality of nozzles constituting the sub-nozzle 160 and a yarn running sensor 170 are arranged along the weft yarn running path 150a.

In the sub-system S, the sub-nozzle 160 is arranged along the weft yarn path 150a of the reed 150 and is composed of a plurality of nozzles. As an example, the sub-nozzles 160 are divided into six groups, and each group is composed of four nozzles. Six sub-valves 165 are provided corresponding to each group of the sub-nozzles 160. The sub-nozzles 160 are connected to the sub-valves 165 of the respective groups via pipes 166, respectively. The sub-valves 165 of each group are connected to a common sub-tank 164. Here, the sub-nozzle 160, the sub-valve 165, and the pipe 166 constitute a sub-valve system SV.

The sub tank 164 is connected to the sub regulator 162 via a pipe 163. The sub-regulator 162 is connected to a pipe P143A between the main regulator 143A and the main tank 144A via a pipe 161. Therefore, the sub-tank 164 stores compressed air that is adjusted to a set pressure by the sub-regulator 162 via the main regulator 143A.

The yarn feeding sensor 170 includes a weaving width inner sensor 171 and an end sensor 172. The intra-knitting-width sensor 171 is disposed upstream of the end sensor 172 and on the opposite side of the main nozzles 142A and 142B from the center of the knitting width TL in the weft yarn running path 150a, and optically detects the arriving weft yarns YA and YB. The intra-weaving-width sensor 171 transmits a weft detection signal generated by detecting the weft YA, YB to the control unit 110. The weft detection signal from the intra-weaving-width sensor 171 IS recognized by the control unit 110 as the weft intermediate arrival time IS at which the ends of the weft yarns YA, YB inserted in the weft reach the position where the intra-weaving-width sensor 171 IS provided, based on the loom rotation angle signal obtained from the encoder.

The end sensor 172 is disposed downstream of the weft yarn running path 150a and downstream of the weaving width TL, and optically detects the arriving weft yarns YA, YB. The end sensor 172 transmits a weft detection signal generated by detecting the weft YA, YB to the control unit 110. The weft detection signal from the end sensor 172 is an arrival signal of the weft YA, YB, and is recognized as the weft insertion end time IE by the control unit 110 based on the loom rotation angle signal obtained from the encoder.

The main nozzles 142A and 142B, the reed 150, and the sub-nozzle 160 are disposed on a sley, not shown, and reciprocally swing in the front-rear direction of the air jet loom. The yarn feeding portions 120A and 120B, the weft length measuring and accumulating portions 130A and 130B, the tandem nozzles 141A and 141B, and the stoppers 147A and 147B are fixed to a frame of an air jet loom, not shown, or a bracket attached to the floor.

In the above configuration, the main valve 146A, the tandem valve 145A, and the brake 147A of the 1 st main system MA, and the main valve 146B, the tandem valve 145B, the brake 147B, and the sub-valve 165 of the 2 nd main system MB are controlled in operation timing and operation period by the control unit 110. Then, the plurality of weft yarns YA and YB drawn out by the air injection from any one of the selected main nozzles 142A and 142B are inserted through the common weft yarn running path 150a by the air injection from the common sub nozzle 160. A plurality of weft yarns YA and YB are selectively inserted.

In the 1 st main system MA, the operation command signals are given from the control unit 110 to the tandem valve 145A and the main valve 146A at a timing earlier than the weft insertion start timing at which the weft yarn locking pin 132A operates, and compressed air is injected from the main nozzle 142A and the tandem nozzle 141A. The control unit 110 outputs an actuation command signal to the brake 147A at a timing earlier than the weft insertion end time IE at which the weft yarn lock pin 132A is actuated to lock the weft yarn YA on the accumulating drum 131A. The brake 147A brakes the weft YA that is traveling at a high speed to reduce the traveling speed of the weft YA and to alleviate the impact of the weft YA at the weft insertion end time IE.

In the 2 nd main system MB, the operation command signal is given from the control unit 110 to the tandem valve 145B and the main valve 146B at a timing earlier than the weft insertion start timing at which the weft engagement pin 132B operates, and compressed air is injected from the main nozzle 142B and the tandem nozzle 141B. The control unit 110 outputs an actuation command signal to the brake 147B at a timing earlier than the weft insertion end time IE at which the weft engagement pin 132B is actuated to engage the weft YB of the accumulating drum 131B. The brake 147B brakes the weft YB that is traveling at a high speed to reduce the traveling speed of the weft YB, thereby alleviating the impact of the weft YB at the weft insertion end time IE.

In the above description, the weft insertion device 100 has 2 sets of the 1 st main system MA and the 2 nd main system MB as a specific example, but may be configured as a multicolor weft insertion device in which 3 or more main systems (MA, MB, MC …) are arranged. The concept of the multicolor weft insertion device includes not only a case where the weft yarns YA and YB as a plurality of weft yarns are different in color but also a case where the weft yarns YA and YB use the same color. The sub-system S is commonly used for 2 or more main systems MA and MB ….

[ principle of abnormality detection ]

Next, the principle of abnormality detection of weft insertion device 100 according to embodiment 1 will be described with reference to fig. 2 and the following drawings. As a premise of embodiment 1, the opening degrees of main valve 146A and main valve 146B are automatically set, and the opening degree of sub-valve 165 is set to a predetermined value.

First, the deflection angle will be described with reference to fig. 2. Fig. 2 is an explanatory view for explaining the deflection angle calculated from the yarn running curve and the unwinding curve in embodiment 1. The skew angle is a difference between the weft unwinding time from the weft length measuring storage units 130A and 130B and the weft arrival time based on the weft detection signal from the weft sensor 170.

In fig. 2, the horizontal axis represents the loom rotation angle, and the vertical axis represents the weft insertion direction position within the knitting width TL. In fig. 2, an unwinding curve (1) and a yarn running curve (1) are shown for the weft yarn YA of the 1 st color of the multicolor.

In fig. 2, the unwinding curve (1) represents the moment of unwinding of the weft yarn YA. The unwinding curve (1) shows an almost straight line characteristic. The yarn feeding curve (1) shows the actually measured state of the weft yarn YA. The yarn running curve (1) shows a state in which the brake 147A is operated between the position of the sensor 171 and the position of the end sensor 172 in the knitting width, and the speed of the weft yarn YA decreases and the inclination thereof becomes gentle after the brake operation. Although not shown, the same unwinding curve (2) and running curve (2) can be obtained for the weft YB of the 2 nd color. In the description of embodiment 1, the weft YA and the weft YB may be different colors or the same color, and the side of the weft YA is referred to as the 1 st color and the side of the weft YB is referred to as the 2 nd color.

Here, the difference in time, which is the deviation in the horizontal axis direction between the unwinding curve (1) and the yarn running curve (1) at the position of the intra-knitting-width sensor 171, is the knitting-width slip angle. Hereinafter, this braid width inner deflection angle is referred to as Ti deflection angle. Similarly, the difference in the timing, which is the deviation between the unwinding curve (1) and the yarn running curve (1) in the horizontal axis direction at the position of the end sensor 172, is the fabric end slip angle. Hereinafter, this weaving end slip angle is referred to as TW slip angle.

Next, a mode in which the delivery capacity of the sub-valve system SV (hereinafter, referred to as "sub-system delivery capacity") and the deflection angle change depending on the presence or absence of an abnormality will be described with reference to fig. 3 to 5. Here, the sub-valve system SV refers to the sub-nozzle 160, the sub-valve 165, and the pipe 166 thereof, and the abnormality occurring in the sub-valve system SV refers to a failure occurring in the sub-nozzle 160, the sub-valve 165, and the pipe 166 thereof. In embodiment 1, a case will be described in which a region in which an abnormality occurs in the sub-valve system SV is specified according to the pattern of changes in the sub-system delivery capacity and the drift angle. Here, a case where the multicolor is 2 colors is taken as a specific example.

Fig. 3 is an explanatory diagram for explaining a change in the deflection angle in embodiment 1. If there is some abnormality in the sub-valve system SV on the upstream side of the intra-braid sensor 171, the slip angle changes as shown in fig. 3.

In fig. 3, the TW deviation angle shown by the solid line is an average value between the TW deviation angle (1) of the 1 st color and the TW deviation angle (2) of the 2 nd color. Here, the variation of the TW deflection angle is small regardless of the variation of the sub-system transport capacity. The Ti off angle shown by the solid line is an average value between the Ti off angle (1) of the 1 st color and the Ti off angle (2) of the 2 nd color. Here, the Ti declination varies to a greater extent than the TW declination with a variation in the sub-system conveyance capacity. In addition, with respect to the change in the deflection angle, the upper limit and the lower limit can be determined as predetermined threshold values based on the range of the deflection angle of the valve standard opening, and it can be determined that there is an abnormality when the upper limit and the lower limit are out of the threshold value range. When the slip angle exceeds the upper limit or falls below the lower limit, it can be determined that there is an abnormality.

In the case of fig. 3, it is considered that there is an abnormality in the Ti deflection angle at the position of the intra-braid width sensor 171, and therefore, it is considered that there is an abnormality in a portion of the sub-valve system SV corresponding to the sub-nozzle 160 that is present upstream of the intra-braid width sensor 171. That is, the control unit 110 detects that some abnormality has occurred in a portion of the sub-valve system SV corresponding to the sub-nozzle 160 upstream of the intra-knitting-width sensor 171.

Fig. 4 is an explanatory diagram for explaining a change in the deflection angle in embodiment 1. If there is an abnormality in the sub-valve system SV on the downstream side of the intra-braid sensor 171, the slip angle changes as shown in fig. 4.

In fig. 4, the TW deviation angle shown by the solid line is an average value between the TW deviation angle (1) of the 1 st color and the TW deviation angle (2) of the 2 nd color. Here, the TW deflection angle greatly changes with a change in the sub-system transport capacity. On the other hand, the Ti declination shown by the solid line is an average value between the Ti declination (1) of the 1 st color and the Ti declination (2) of the 2 nd color, and the variation of the Ti declination is smaller than the variation of the TW declination regardless of the variation of the sub-system transport capacity.

In the case of fig. 4, it is considered that there is an abnormality in the TW deflection angle at the position of the end sensor 172, and therefore, it is considered that there is an abnormality in a portion of the sub-valve system SV corresponding to the sub-nozzle 160 existing between the intra-braid width sensor 171 and the end sensor 172. That is, the control unit 110 detects that some abnormality occurs in a portion of the sub-valve system SV corresponding to the sub-nozzle 160 between the intra-knitting-width sensor 171 and the end sensor 172.

Fig. 5 is an explanatory diagram for explaining a change in the deflection angle in embodiment 1. If there is an abnormality in the sub-system conveyance capability immediately before the intra-knitting-width sensor 171, the slip angle changes as shown in fig. 5.

In fig. 5, the TW deviation angle shown by the solid line is an average value between the TW deviation angle (1) of the 1 st color and the TW deviation angle (2) of the 2 nd color. Here, the TW deflection angle greatly changes with a change in the sub-system transport capacity. The Ti off angle shown by the solid line is an average value of the Ti off angle (1) of the 1 st color and the Ti off angle (2) of the 2 nd color. Here, the Ti declination angle also greatly changes with a change in the sub-system transport capacity.

In the case of fig. 5, it is considered that both the Ti deflection angle at the position of the weaving width inner sensor 171 and the TW deflection angle at the position of the end sensor 172 are abnormal, and therefore, it is considered that a portion of the sub valve system SV corresponding to the sub nozzle 160 existing in the upstream vicinity immediately before the weaving width inner sensor 171 is abnormal. That is, the control unit 110 detects that some abnormality has occurred in a portion of the sub-valve system SV corresponding to the sub-nozzle 160 in the upstream vicinity immediately before the intra-knitting-width sensor 171.

[ order of abnormality detection ]

Next, the processing procedure of the abnormality detection method of weft insertion device 100 according to embodiment 1 will be described with reference to fig. 6. Fig. 6 is a flowchart showing the procedure of abnormality detection in embodiment 1.

In step S101, the control unit 110 sets various parameters for abnormality detection using input values or actual measurement values from the function panel 112. As the parameters, a target value, a lower limit value, and an upper limit value are associated with the TW deflection angle and the Ti deflection angle of the 1 st color and the 2 nd color, respectively. The upper limit value and the lower limit value correspond to the threshold values used for the above determination. Here, the outside of the threshold range includes a case where the deflection angle exceeds the upper limit value and a case where the deflection angle is lower than the lower limit value. Thereafter, the process advances to step S102.

In step S102, the control unit 110 acquires the TW skew angles and Ti skew angles of the 1 st color and the 2 nd color from the unwinding curve and the running curve shown in fig. 2. Thereafter, the process advances to step S103.

In step S103, the control unit 110 determines whether or not the change in the TW skew angle and the Ti skew angle match in each of the plurality of colors.

When the variation in the TW off-angle and the Ti off-angle do not match in each of the multiple colors, the process proceeds to step S104. In step S104, since the change in the TW skew and the Ti skew do not match in each of the colors of the plurality of colors, the control unit 110 determines that there is an abnormality other than the sub valve system SV. Thereafter, the process advances to step S111.

On the other hand, when it is determined in step S103 that the variations in the TW skew angle and the Ti skew angle match in each of the plurality of colors, an abnormality occurs in any one portion of the sub-valve system SV, and the abnormal portion is identified, so the process proceeds to step S105. In step S105, control unit 110 determines whether the Ti declination angle is outside the threshold range. If it is determined that the Ti declination is outside the threshold range, the process proceeds to step S106. In step S106, the control unit 110 determines whether the TW deflection angle is outside the threshold range.

On the other hand, if it is determined in step S105 that the Ti declination angle is not outside the threshold range, the process proceeds to step S107. In step S107, the control unit 110 determines whether the TW deflection angle is outside the threshold range.

If it is determined in step S106 that the TW deflection angle is not outside the threshold range, only the Ti deflection angle is outside the threshold range, and the process proceeds to step S108. In step S108, the control unit 110 detects that some abnormality has occurred in a portion of the sub-valve system SV corresponding to the sub-nozzle 160 upstream of the intra-braid sensor 171. Thereafter, the process advances to step S111.

If it is determined in step S106 that the TW deflection angle is outside the threshold range, both the Ti deflection angle and the TW deflection angle are outside the threshold range, and the process proceeds to step S109. In step S109, the control unit 110 detects that some abnormality has occurred in a portion of the sub-valve system SV corresponding to the sub-nozzle 160 in the upstream vicinity immediately before the intra-knitting-width sensor 171. Thereafter, the process advances to step S111.

If it is determined in step S107 that the TW deflection angle is outside the threshold range, only the TW deflection angle is outside the threshold range, and the process proceeds to step S110. In step S110, the control unit 110 detects that some abnormality has occurred in a portion of the sub valve system SV corresponding to the sub nozzle 160 between the intra-braid width sensor 171 and the end sensor 172. Thereafter, the process advances to step S111.

In step S111, the control unit 110 displays the contents of the abnormality determined based on the deflection angle on the function panel 112, and issues a warning if necessary. Thereafter, the process advances to step S112.

On the other hand, if it is determined in step S107 that the TW deflection angle is not out of the threshold range, it is determined in step S105 that the Ti deflection angle is not out of the threshold range and neither the Ti deflection angle nor the TW deflection angle is out of the threshold range, and therefore the process proceeds to step S112.

In step S112, the control unit 110 determines whether to continue weaving or to end weaving. When the weaving is finished, the processing of the flowchart of fig. 6 is finished. On the other hand, if the weaving is continued, the process returns to step S102. That is, the control unit 110 repeatedly executes the processing of steps S102 to S111 as the abnormality detection of the weft insertion device 100 until the weaving is completed.

[ setting of setting screen and information display (1) ]

Next, a specific example of a setting screen of the function panel 112 when abnormality detection of the weft insertion device 100 according to embodiment 1 is performed will be described with reference to fig. 7. Fig. 7 is an explanatory diagram for explaining the setting screen 112P according to embodiment 1.

The setting screen 112P shown in fig. 7 is capable of executing an automatic correction switch (a) for the warning range, a warning on-off switch (b) for the measured value TW of the end sensor 172, a warning on-off switch (c) for the TW off angle, a warning on-off switch (d) for the Ti off angle, a lower limit (e) for the measured value TW of the 1 st color, an upper limit (f) for the measured value TW of the 1 st color, an actual measured value (g) for the measured value TW of the 1 st color, a lower limit (h) for the measured value TW of the 2 nd color, an upper limit (i) for the measured value TW of the 2 nd color, an actual measured value (j) for the measured value TW of the 2 nd color, a lower limit (k) for the TW off angle of the 1 st color, an actual measured value (n) for the TW off angle of the 1 st color, a lower limit (o) for the TW off angle of the 2 nd color, an upper limit (P) for the off angle of the 2 nd color, and, A screen display, selection operation, and input of a measured value (q) of the TW cast angle of the 2 nd color, a lower limit value (r) of the Ti cast angle of the 1 st color, an upper limit value(s) of the Ti cast angle of the 1 st color, a measured value (t) of the Ti cast angle of the 1 st color, a lower limit value (u) of the Ti cast angle of the 2 nd color, an upper limit value (v) of the Ti cast angle of the 2 nd color, and a measured value (w) of the Ti cast angle of the 2 nd color.

On the setting screen 112P, numerical values can be manually input as the upper limit value and the lower limit value of the target range for (e), (f), (h), (i), (k), (m), (o), (P), (r),(s), (u), and (v). On the other hand, when the warning range automatic correction switch (a) is pressed on the setting screen 112P, the control unit 110 reads the actual measurement values (g), (j), (n), (q), (t), and (w) measured at the present time, and automatically inputs the upper limit value and the lower limit value of the target range with the actual measurement values as the center.

The automatic input of the setting screen 112P will be described with reference to fig. 8 and 9. Fig. 8 is an explanatory diagram for explaining the automatic input of the setting screen 112P in embodiment 1. Fig. 9 is an explanatory diagram for explaining a state after the automatic input of the setting screen 112P in embodiment 1.

When the warning range automatic correction switch (a) is pressed on the setting screen 112P in fig. 8 while the injection pressure of the sub-nozzle 160 is kept in an appropriate state, the control unit 110 reads a value "240" of the measured value (g) of the measured value TW of the 1 st color, a value "240" of the measured value (j) of the measured value TW of the 2 nd color, a value "5.0" of the measured value (n) of the TW deflection angle of the 1 st color, a value "5.3" of the measured value (q) of the TW deflection angle of the 2 nd color, a value "3.4" of the measured value (t) of the Ti deflection angle of the 1 st color, and a value "3.8" of the measured value (w) of the Ti deflection angle of the 2 nd color.

The control unit 110 sets the lower limit value and the upper limit value to the specific example shown in the setting screen 112P in fig. 9 described below with reference to the read actual measurement values. The ranges of the lower limit and the upper limit with respect to the reference value can be set to arbitrary values.

The control unit 110 sets 215 the lower limit value (e) of the measurement value TW of the 1 st color to the reference value of-25 and sets 265 the upper limit value (f) of the measurement value TW of the 1 st color to the reference value of +25, based on the value "240" of the actual measurement value (g) of the measurement value TW of the 1 st color. Similarly, the control unit 110 sets the lower limit value (h) of the measured value TW of the 2 nd color to 215 of the reference value of-25 and sets the upper limit value (i) of the measured value TW of the 2 nd color to 265 of the reference value of +25, based on the value "240" of the measured value (j) of the measured value TW of the 2 nd color.

Similarly, the control unit 110 sets the 1 st color TW deviation angle lower limit value (k) to 5.0 equal to the reference value and sets the 1 st color TW deviation angle upper limit value (m) to 7.0 of the reference value +2.0, with reference to the value "5.0" of the 1 st color TW deviation angle actual measurement value (n). Similarly, the control unit 110 sets the 2 nd color TW off-angle lower limit value (o) to 5.3 equal to the reference value and sets the 2 nd color TW off-angle upper limit value (p) to 7.3 of the reference value +2.0, with reference to the value "5.3" of the actual TW off-angle measurement value (q) of the 2 nd color.

Similarly, the control unit 110 sets the lower limit value (r) of Ti cast angle of 1 st color to 3.4 equal to the reference value and sets the upper limit value(s) of Ti cast angle of 1 st color to 4.4 of +1.0 with reference to "3.4" of the actually measured value (t) of Ti cast angle of 1 st color. Similarly, the control unit 110 sets the lower limit value (u) of the Ti cast angle of the 2 nd color to 3.8 equal to the reference value and sets the upper limit value (v) of the Ti cast angle of the 2 nd color to 4.8 of the reference value +1.0, based on the value "3.8" of the actually measured value (w) of the Ti cast angle of the 2 nd color. The numerical values used here are examples and can be changed.

Next, a specific example of display will be described with reference to fig. 10 to 15 with respect to information display on the function panel 112 when it is determined that there is an abnormality when abnormality detection is performed in the weft insertion device 100 according to embodiment 1.

The information display state of the function panel 112 in the case where an abnormality is detected will be described with reference to fig. 10 and 11. Fig. 10 is an explanatory diagram for explaining the information screen 112P1 according to embodiment 1. Fig. 11 is an explanatory diagram illustrating the warning screen 112P2 according to embodiment 1.

When the weft insertion device 100 is operated, as shown in the information screen 112P1 of fig. 10, a state in which the measured Ti deflection angle value (t) of the 1 st color and the measured Ti deflection angle value (w) of the 2 nd color exceed the upper limit value is shown as a specific example. The state shown in fig. 10 belongs to the abnormality detection state of step S109 of the flowchart of fig. 6. Therefore, the control unit 110 reports to the user or the administrator that some abnormality has occurred in the portion of the sub-valve system SV corresponding to the sub-nozzle 160 in the upstream vicinity immediately before the intra-braid sensor 171 on the warning screen 112P2 in fig. 11. For example, as shown in fig. 11, the CPU111 in the control unit 110 controls the Ti declination angle including "color 1 and color 2 to be outside the allowable range. There is a possibility that an abnormality occurs in the sub-valve system on the upstream side of the sensor in the knitting width. Please check the sub-valve, sub-nozzle, and piping system. "or the like message warning screen 112P2 is displayed on the function panel 112. The CPU111 in the controller 110 controls the function panel 112 to display the warning screen 112P2 as the information screen 112P1 in a switched manner, or to display the warning screen 112P2 on the information screen 112P1 by pop-up display.

Another state of information display on the function panel 112 in the case where an abnormality is detected will be described with reference to fig. 12 and 13. Fig. 12 is an explanatory diagram for explaining the information screen 112P1 according to embodiment 1. Fig. 13 is an explanatory diagram for explaining the warning screen 112P2 according to embodiment 1.

When the weft insertion device 100 is operated, as shown in the information screen 112P1 in fig. 12, a state in which the TW misalignment angle actual measurement value (n) of the 1 st color and the TW misalignment angle actual measurement value (q) of the 2 nd color exceed the upper limit value is shown as a specific example. The state shown in fig. 12 belongs to the abnormality detection state of step S110 of the flowchart of fig. 6. Therefore, the control unit 110 reports to the user or the administrator that some abnormality is present in the portion of the sub-valve system SV corresponding to the sub-nozzle 160 on the downstream side of the intra-braid width sensor 171 on the warning screen 112P2 of fig. 13.

For example, as shown in fig. 13, the CPU111 in the control unit 110 controls the TW off-angle including "color 1 and color 2 to be outside the allowable range. There is a possibility that an abnormality occurs in the sub-valve system on the downstream side of the sensor in the knitting width. Please check the sub-valve, sub-nozzle, and piping system. "or the like message warning screen 112P2 is displayed on the function panel 112. The CPU111 in the controller 110 controls the function panel 112 to display the warning screen 112P2 as the information screen 112P1 in a switched manner, or to display the warning screen 112P2 on the information screen 112P1 by pop-up display.

Still another situation of information display on the function panel 112 in the case where an abnormality is detected will be described with reference to fig. 14 and 15. Fig. 14 is an explanatory diagram for explaining the information screen 112P1 according to embodiment 1. Fig. 15 is an explanatory diagram illustrating the warning screen 112P2 according to embodiment 1.

When the weft insertion device 100 is operated, as shown in the information screen 112P1 of fig. 14, a state in which only the actually measured Ti deviation angle (t) in the 1 st color exceeds the upper limit value is shown as a specific example. The state shown in fig. 14 belongs to the abnormality detection state of step S104 of the flowchart of fig. 6. Therefore, the control unit 110 reports to the user or the manager that there is some abnormality in the weft yarn YA of, for example, the 1 st color other than the sub-valve system SV through the warning screen 112P2 in fig. 15.

For example, as shown in fig. 15, the CPU111 in the control unit 110 controls the Ti declination angle including "color 1 to be outside the allowable range. There is a possibility that an abnormality is generated in addition to the sub-valve system. Please identify the weft yarn of color 1. "or the like message warning screen 112P2 is displayed on the function panel 112. In the case of using weft yarns of 4 colors or more, the presence or absence of an abnormality in the weft yarns can be detected similarly from the change in the TW bias angle and the Ti bias angle of any 2 colors.

[ setting of setting screen and information display (2) ]

Next, a specific example of a setting screen of the function panel 112 when abnormality detection of the weft insertion device 100 according to embodiment 1 is performed will be described with reference to fig. 16. Fig. 16 is an explanatory diagram for explaining the setting screen 112P3 according to embodiment 1. In the following description, the injection pressure of the main nozzles 142A and 142B is automatically controlled not only by controlling the opening degrees of the main valves 146A and 146B, but also by controlling the opening degree of the sub valve 165 according to the setting, the injection pressure of the sub nozzle 160 can be automatically controlled.

The setting screen 112P3 shown in fig. 16 can perform setting of the value (a) of the target TW for each color, the on/off setting (B) of the injection pressure control of the main nozzles 142A, 142B for each color, the injection pressure range (c) of the main nozzles 142A, 142B for each color, the control cycle (d) of the injection pressure of the main nozzles 142A, 142B, the color selection (e) of the Ti bias angle used for controlling the injection pressure of the sub-nozzle 160, the value (f) of the target Ti bias angle, the presence or absence of the control of the injection pressure of the sub-nozzle 160 (g), the control range (h) of the injection pressure of the sub-nozzle 160, and the control cycle (i) of the injection pressure of the sub-nozzle 160.

When the setting of the setting screen 112P3 of fig. 16 is finished, the control unit 110 controls the injection pressures of the main nozzles 142A and 142B so as to match the target TW within a range of ± 1 ° for each color, for example. The feedback control at this time is performed at the designated control cycle. Then, the control unit 110 controls the injection pressures of the main nozzles 142A and 142B at this time so as not to be outside the set injection pressure ranges of the main nozzles 142A and 142B.

Here, if the average Ti declination of the color selected in fig. 16 (e) is smaller than the target Ti declination, the control unit 110 decreases the ejection pressure of the sub-nozzle 160 by a predetermined amount, for example, by 0.01 MPa. On the other hand, if the average Ti declination of the selected color is larger than the target Ti declination, the ejection pressure of the sub-nozzle 160 is increased by a predetermined amount, for example, by 0.01 MPa. The allowable range of the target Ti declination at this time is, for example, a target value ± 0.5 °. The feedback control at this time is executed by the control unit 110 at a designated control cycle. Then, the control unit 110 controls the injection pressure of the sub-nozzle 160 at this time so as not to be outside the set injection pressure range of the main nozzles 142A and 142B.

Next, a description will be given of a state of information display on the function panel 112 in the case where an abnormality is detected, with reference to fig. 17 and 18.

With reference to fig. 17: an example of the information screen 112P4 is shown when an abnormality occurs in any one of the positions of the sub-valve 165 when the weft insertion device 100 is operating and the jet pressure of the sub-nozzle 160 is not automatically controlled. Fig. 17 is an explanatory diagram for explaining the information screen 112P4 according to embodiment 1. The items (a) to (w) in fig. 17 are the same as those in (a) to (w) in fig. 7 to 10, and redundant description is omitted. Further, (x) of fig. 17 shows the injection pressure of the main nozzle 142A of the 1 st color, (y) of fig. 17 shows the injection pressure of the main nozzle 142B of the 2 nd color, and (z) of fig. 17 shows the injection pressure of the sub-nozzle 160.

The information screen 112P4 shown in fig. 17 shows a state in which the measured Ti cast angle value (t) of the 1 st color exceeds the upper limit value(s), and the measured Ti cast angle value (w) of the 2 nd color exceeds the upper limit value (v). The state shown in fig. 17 belongs to the abnormality detection state in step S109 of the flowchart in fig. 6, and shows that there is some abnormality in the portion of the sub valve system SV corresponding to the sub nozzle 160 in the upstream vicinity immediately before the intra-braid sensor 171.

On the other hand, description will be made with reference to fig. 18: an example of the information screen 112P5 is shown when an abnormality occurs in any one of the positions of the sub-valve 165 when the jet pressure of the sub-nozzle 160 is automatically controlled during operation of the weft insertion device 100. Fig. 18 is an explanatory diagram for explaining the information screen 112P5 according to embodiment 1. The items (a) to (z) in fig. 18 are the same as those in fig. 17, and redundant description thereof will be omitted.

In the information screen 112P5 shown in fig. 18, the actual Ti deflection angle measurement value (t) of the 1 st color and the actual Ti deflection angle measurement value (w) of the 2 nd color are smaller than those on the information screen 112P4 shown in fig. 17 by controlling the ejection pressure of the sub-nozzles 160. However, the injection pressure (z) of the sub-nozzle 160 reaches the upper limit of the control range (see fig. 16 (h)), and the injection pressure of the sub-nozzle 160 cannot be further increased. In this state, the Ti deflection angle actual measurement value (t) of the 1 st color exceeds the upper limit value(s), and the Ti deflection angle actual measurement value (w) of the 2 nd color exceeds the upper limit value (v). Therefore, the state shown in fig. 18 belongs to the abnormality detection state in step S109 of the flowchart in fig. 6, and shows that there is some abnormality in the portion of the sub-valve system SV corresponding to the sub-nozzle 160 in the upstream vicinity immediately before the intra-braid sensor 171.

That is, during the operation of the weft insertion device 100, the abnormality occurring in the sub-valve 165 can be detected in any control state of the case where the injection pressure of the sub-nozzle 160 shown in fig. 17 is not automatically controlled and the case where the injection pressure of the sub-nozzle 160 shown in fig. 18 is automatically controlled.

As described above, according to embodiment 1, the following effects can be obtained.

(1) When a plurality of weft yarns YA and YB drawn out by air injection from any one of the main nozzles selected from the plurality of main nozzles 142A and 142B are inserted through the common weft yarn running path 150A by air injection from the common sub nozzle 160, an abnormality occurring in the sub valve system SV can be detected when deviation angles, which are differences between weft unwinding times unwound from the weft length measurement storage units 130A and 130B and weft arrival times based on weft detection signals from the yarn running sensor 170, exceed a predetermined threshold value in accordance with sub system transport capacity, respectively for the deviation angles of the plurality of weft yarns YA and YB.

(2) The yarn passage sensor 170 includes a terminal sensor 172 provided at a downstream weaving end of the weft yarn passage 150a in the weaving width and an in-weaving width sensor 171 provided on the opposite side of the main nozzles 142A and 142B from the center of the weaving width of the weft yarn passage 150a and on the upstream side of the terminal sensor 172. Further, when the TW skew at the position of the end sensor 172 and/or the Ti skew at the position of the sensor 171 in the weaving width exceeds a predetermined threshold value in accordance with the sub-system transport capacity for each of the plurality of weft yarns, it is possible to detect an abnormality occurring in the sub-valve system SV.

(3) From the patterns of the changes in the TW skew angle and Ti skew angle for each of the plurality of weft yarns, it is possible to specify the region where an abnormality occurs in the sub-valve system SV.

(4) When the Ti deflection angle of the TW deflection angle and the Ti deflection angle for each of the plurality of weft yarns exceeds a predetermined threshold value in accordance with the sub-system transport capacity, it is possible to detect an abnormality occurring in a portion of the sub-valve system SV corresponding to the sub-nozzle 160 on the upstream side of the intra-weaving-width sensor 171.

(5) When the TW skew angle of the TW skew angles and the Ti skew angles for the plurality of weft yarns exceeds the sub-system transport capacity in accordance with the predetermined threshold value, it is possible to detect an abnormality occurring in a portion of the sub-valve system SV corresponding to the sub-nozzle 160 on the downstream side of the intra-weaving-width sensor 171.

(6) When the Ti deflection angle and the TW deflection angle for each of the plurality of weft yarns exceeds a predetermined threshold value in accordance with the sub-system transport capacity, it is possible to detect an abnormality occurring in a portion of the sub-valve system SV corresponding to the sub-nozzle 160 in front of the weaving width inner sensor 171.

(7) When a weft yarn YA and a weft yarn YB drawn out by air injection from any one of the plurality of main nozzles 142A, 142B are inserted through the common weft yarn running path 150a by air injection from the common sub nozzle 160, it is possible to detect that there is an abnormality in the sub valve system SV when the deflection angle corresponding to the sub system transport capacity exceeds a predetermined threshold value for both of the plurality of weft yarns YA, YB, and it is possible to detect that there is an abnormality in the sub valve system SV when the deflection angle corresponding to the sub system transport capacity exceeds a predetermined threshold value for any one of the plurality of weft yarns YA, YB.

[ other embodiments ]

A modification of embodiment 1 will be described below.

In the above description, the abnormality of the slip angle is determined using the in-knitting-width sensor 171 and the end sensor 172 for each color in accordance with the knitting width TL, but the abnormality of the slip angle may be detected using only one of the in-knitting-width sensor 171 and the end sensor 172 for each color. In this case, it is possible to detect an abnormality in the sub-system transport capacity corresponding to the sub-nozzle 160 in the region around only one sensor.

The case where the yarn feeding sensor 170 includes one knitting width inner sensor 171 and one end sensor 172 for each color has been described, but the present invention is not limited to this. For example, by providing a plurality of intra-knitting-width sensors 171 for each color, it is possible to more finely grasp the position of occurrence of an abnormality in the sub-system conveyance capability.

In the above description, the control unit 110 is shown as a single unit, but the control unit for controlling the operation and the control unit for detecting an abnormality may be configured separately. The functional panel 112 is not limited to the case of being disposed at a position close to the weft insertion device 100, and may be provided at a position away from the weft insertion device 100 via a communication unit. For example, the function panel 112 may be provided in a management terminal that centrally manages a plurality of weft insertion devices 100.

Instead of the display screen of the function panel 112 or the display screen of the function panel 112, the result of detecting an abnormality may be reported by lighting a warning display lamp or sounding a buzzer or a siren. The report of the abnormality detection result may be made not only in the vicinity of the weft insertion device 100 but also to the management terminal.

In the above description, the upper limit and the lower limit are determined as the predetermined threshold values based on the range of the deflection angle at the valve standard opening degree, and it is determined that there is an abnormality when the deflection angle is out of the threshold range between the upper limit and the lower limit.