JP7156140B2 - AIR-JET LOOM AND CONTROL METHOD OF AIR-JET LOOM - Google Patents

Description

The present invention relates to an air-jet loom and an air-jet loom control method.

Air-jet looms generally have a weft inserting nozzle and a plurality of sub-nozzles. A plurality of sub-nozzles are arranged along the running path of the weft that runs by jetting air from the weft inserting nozzle. A plurality of sub-nozzles are divided into groups of a plurality of sub-nozzles in the order of their arrangement. A plurality of sub-nozzles belonging to the same group are each connected to a common on-off valve, and inject air only during the period in which this on-off valve is in an open state.

Air jet looms are required to reduce the amount of air consumed by jetting air from nozzles. However, if the air consumption is simply reduced, the target position arrival timing of the weft will be delayed, which may lead to weft insertion errors.

Therefore, for example, in Patent Document 1, in order to reduce the air consumption of the sub-nozzles, one injection amount reduction pattern is selected from a plurality of injection amount reduction patterns with different air injection amounts, and the selected injection amount reduction pattern A technique for confirming whether or not it is appropriate by trial weaving is described. Specifically, when trial weaving is performed based on the selected injection amount reduction pattern, if the target position arrival timing is within the allowable range, the injection amount reduction pattern is determined to be appropriate, and the target position arrival timing is determined. is delayed beyond the permissible range, or the weft yarn is loosened or the like, it is determined that the injection amount reduction pattern is inappropriate. Then, when it is determined that the selected injection amount reduction pattern is inappropriate, the injection amount reduction pattern is selected again, and the adequacy of the injection amount reduction pattern is confirmed by test weaving again.

JP 2012-117156 A

By the way, when the weft yarn is inserted by jetting air from the nozzle, the timing of reaching the target position varies depending not only on the amount of air injected by the weft insertion nozzle or sub-nozzle, but also on the physical properties of the weft yarn used for weft insertion. Further, the physical properties of the weft may vary in the longitudinal direction of the weft even if the type of weft (material, count, etc.) is the same. In addition, the weft used for weft insertion is supplied in a state of being wound around a weft cheese, but even if the same type of weft is wound on the weft cheese, the physical properties of the weft may vary among the weft cheeses. be.

However, in the technique described in Patent Document 1, the appropriateness of the selected injection amount reduction pattern is determined mainly based only on the target position arrival timing. Therefore, it may not be possible to correctly determine whether the injection amount reduction pattern is appropriate. Specifically, when the physical property values of the weft inserted in the trial weaving deviate greatly from the average values, it is determined that the selected injection amount reduction pattern is appropriate even though it is inappropriate, Conversely, the selected injection amount reduction pattern may be determined to be inappropriate even though it is appropriate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. Another object of the present invention is to provide a control method for an air jet loom.

An air-jet loom according to the present invention comprises a weft insertion nozzle for inserting a weft yarn, and a plurality of sub-nozzles arranged along a flight path of the weft yarn flying by jetting air from the weft insertion nozzle. a control unit for controlling air injection by a plurality of sub-nozzles; a first detection sensor for detecting physical property values of the weft yarn inserted by the weft insertion nozzle; a second detection sensor that detects the timing of reaching the target position, a storage unit that stores a plurality of injection amount reduction patterns prepared in advance for reducing the amount of air injected by the plurality of sub-nozzles, and a plurality of injection amounts a selection unit that selects one injection amount reduction pattern from among the reduction patterns, and the control unit controls air injection by the plurality of sub-nozzles based on the injection amount reduction pattern selected by the selection unit. In addition to performing the trial weaving, the physical properties of the weft inserted by the trial weaving and the target position arrival timing are determined using the detection result of the first detection sensor and the detection result of the second detection sensor obtained by the trial weaving. is specified after performing trial weaving, and if the physical property values of the specified weft yarn are within a preset range and the specified target position arrival timing is within a preset allowable range, it is selected. It is determined that the injection amount reduction pattern obtained is appropriate.

In the air-jet loom according to the present invention, when the physical property values of the identified weft yarn are out of the predetermined range, the control unit may repeat the test weaving until the physical property values of the weft yarn are within the predetermined range.

A control method for an air-jet loom according to the present invention comprises a weft insertion nozzle for inserting a weft yarn, and a plurality of weft yarns arranged along a flight path of the weft flying by jetting air from the weft insertion nozzle. a first detection sensor for detecting the physical property value of the weft inserted by the weft insertion nozzle; and a target position arrival timing for the weft inserted by the weft insertion nozzle to reach the target position. A control method for an air jet loom comprising 2 detection sensors, wherein one of a plurality of injection amount reduction patterns prepared in advance for reducing the amount of air injected by a plurality of sub-nozzles is selected. performing trial weaving by controlling air ejection from a plurality of sub-nozzles based on the selected ejection amount reduction pattern; detecting the result of the first detection sensor obtained by performing the trial weaving; 2, a step of specifying the physical property values of the weft inserted by the trial weaving and the timing of reaching the target position after the trial weaving using the detection results of the detection sensors, and setting the physical property values of the specified weft in advance. judging that the selected injection amount reduction pattern is appropriate when it is within a predetermined range and the identified target position arrival timing is within a preset allowable range.

According to the present invention, it is possible to more appropriately determine whether an injection amount reduction pattern for reducing the air injection amount of the sub-nozzles is appropriate.

1 is a schematic diagram showing the configuration of a weft insertion device of an air-jet loom according to an embodiment of the present invention; FIG. 2 is a block diagram showing the configuration of a control device provided in the weft insertion device of the air-jet loom of FIG. 1; FIG. It is a figure explaining a plurality of injection quantity reduction patterns. 4 is a flow chart showing an example of processing performed for setting an injection amount reduction pattern in the weft insertion device of the air-jet loom according to the embodiment of the present invention. FIG. 4 is a diagram showing the relationship between weft arrival timing at a target position and weft mass. FIG. 5 is a diagram for explaining the relationship between the weft arrival timing at the target position and the reduction amount of the sub-nozzle injection amount;

FIG. 1 is a schematic diagram showing the configuration of a weft insertion device of an air jet loom according to an embodiment of the present invention.
As shown in FIG. 1, the weft insertion device 1 has a weft cheese 2 on the upstream side in the weft conveying direction. A weft state detection sensor 3 is arranged downstream of the weft cheese 2 , and a weft storage device 4 is arranged downstream of the weft state detection sensor 3 .

The weft cheese 2 supplies the weft 11 used for weft insertion to the weft storage device 4 . The weft state detection sensor 3 constitutes a first detection sensor for detecting physical property values of the weft 11 inserted by the weft insertion nozzle. The detection result of the weft state detection sensor 3 is notified to the control device 31 .

The physical property values of the weft 11 that can be detected by the weft state detection sensor 3 include, for example, the mass of the weft per unit length (hereinafter referred to as "mass of the weft"), the fluffiness of the weft, the diameter of the weft, and the like. can be done. The weft mass can be detected by configuring the weft state detection sensor 3 with a capacitive sensor. The fluffiness of the weft and the diameter of the weft can be detected by configuring the weft state detection sensor 3 with an optical sensor. Incidentally, a method for detecting physical property values (mass, fluffiness, diameter, etc.) of the weft 11 is also described in Japanese National Publication of International Patent Application No. 2014-500914 (see paragraph numbers 0002, 0003, and 0041 in particular).

The weft mass, the fluffiness of the weft, and the diameter of the weft are all physical property values of the weft that affect the target position arrival timing. The target position arrival timing is the timing at which the weft 11 reaches the target position. Under the same condition of air injection from the weft inserting nozzle, the target position reaching timing is delayed when the weft mass is large, and the target position reaching timing is early when the weft mass is small. Further, when the weft yarn has little fluffiness, the target position arrival timing is delayed, and when the weft yarn has much fluffiness, the target position arrival timing is advanced. Also, when the diameter of the weft yarn is large, the timing of reaching the target position is delayed, and when the diameter of the weft yarn is small, the timing of reaching the target position is advanced. In this embodiment, as an example of the physical property value of the weft, the weft state detection sensor 3 detects the mass of the weft.

The weft storage device 4 stores the weft before weft insertion. The weft storage device 4 has a measuring drum 15 and a locking pin 17 . The weft accumulating device 4 winds the weft 11 supplied from the weft cheese 2 to the weft accumulating device 4 around a measuring drum 15 and accumulates the weft.

The locking pin 17 is a pin capable of locking the weft 11 used for weft insertion. The locking pin 17 operates according to the driving of the electromagnetic solenoid 19 . Driving of the electromagnetic solenoid 19 is controlled by a control device 31 . The operating state of the locking pin 17 can be switched by the control device 31 controlling the driving of the electromagnetic solenoid 19 . The operating state of the locking pin 17 includes a first operating state in which the tip of the locking pin 17 is separated from the length measuring drum 15 to allow the weft 11 to be fed out, and a first operating state in which the tip of the locking pin 17 is separated from the length measuring drum 15 to allow the feeding of the weft 11 . There is a second operating state in which the weft yarn 11 is inhibited from being let out by abutment.

A balloon sensor 20 is arranged near the length measuring drum 15 . The balloon sensor 20 is a sensor that detects the balloon of the weft yarn 11 sent out from the length measuring drum 15 by the first operating state of the locking pin 17 and outputs the detection result to the control device 31 as an electric signal. The weft tension correction device 5 is a device that corrects the tension applied to the weft 11 so that the weft 11 is not subjected to excessive tension.

The main nozzle 6 and the main nozzle 7 constitute a weft inserting nozzle. The main nozzle 7 is arranged downstream of the tandem nozzle 6 in the weft conveying direction. A plurality of sub-nozzles 8 are arranged downstream of the tandem nozzle 7 .

The main nozzle 7 is connected to the main tank 16 via the main valve 12 , and the tandem valve 14 is connected to the main tank 16 via the tandem valve 14 . A regulator 18 is connected to the main tank 16 . A regulator 18 adjusts the pressure of compressed air generated by an air compressor (not shown). The main tank 16 stores compressed air whose pressure is regulated by the regulator 18 . Compressed air stored in the main tank 16 is supplied to the main nozzle 7 via the main valve 12 and to the tandem nozzle 6 via the tandem valve 14 .

The main nozzle 7 injects or stops air depending on whether the main valve 12 is opened or closed. The tandem nozzle 6 injects or stops air depending on whether the tandem valve 14 is opened or closed. Specifically, the main nozzle 7 injects air when the main valve 12 is open, and stops injecting air when the main valve 12 is closed. Similarly, the tandem nozzle 6 injects air when the tandem valve 14 is open, and stops injecting air when the tandem valve 14 is closed. The main valve 12 and the tandem valve 14 are electrically connected to the control device 31 respectively. The control device 31 individually controls the open/close state of the main valve 12 and the open/close state of the tandem valve 14 .

When inserting the weft yarn 11 by jetting air from the tandem nozzle 6 or the main nozzle 7, the main valve 12 or the tandem valve 14 is opened at a predetermined timing so that the nozzles 6 and 7 Compressed air is injected.

A plurality of sub-nozzles 8 are arranged at predetermined intervals from each other. Each of the sub-nozzles 8 jets air in a direction that assists the flight of the weft yarn 11 that runs in the longitudinal direction of the reed 9 by jetting air from the tandem nozzle 6 and the main nozzle 7, i.e., in the downstream direction. , serves to stabilize the weft insertion. The reed 9 is arranged along the flight path of the weft 11 . The reed 9 performs a beating operation once each time the weft 11 is inserted by one pick. A cutter 21 is arranged between the main nozzle 7 and the reed 9 . The cutter 21 cuts the weft 11 each time one weft 11 is inserted, that is, each pick. Driving of the cutter 21 is controlled by the controller 31 .

A plurality of sub-nozzles 8 are arranged along the flight path of the weft yarn 11 . Also, the plurality of sub-nozzles 8 are divided into groups of a plurality of sub-nozzles 8 in the order of their arrangement. Specifically, the plurality of sub-nozzles 8 are divided into a total of six groups, with four sub-nozzles 8 adjacent in the longitudinal direction of the reed 9 forming one group. The number of sub-nozzles 8 belonging to one group and the number of groups of sub-nozzles 8 can be appropriately set or changed according to the weaving width and the like.

Each group of sub-nozzles 8 is connected to a sub-tank 23 via a corresponding sub-valve 22 . A regulator 24 is connected to the sub tank 23 . The regulator 24 adjusts the pressure of compressed air generated by an air compressor (not shown). The sub-tank 23 stores compressed air whose pressure is adjusted by the regulator 24 . Compressed air stored in the sub-tank 23 is distributed and supplied to the sub-nozzles 8 of each group via each sub-valve 22 .

The sub-nozzles 8 of each group inject or stop air according to the open/close state of the corresponding sub-valves 22 . Specifically, the sub-nozzles 8 in each group inject air when the corresponding sub-valve 22 is open, and stop injecting air when the sub-valve 22 is closed.

The weft feeler 10 constitutes a second detection sensor that detects the target position timing at which the weft inserted by the weft insertion nozzle reaches the target position. The weft feeler 10 detects that the weft 11 has reached a preset target position when inserting the weft 11 by jetting air from the tandem nozzle 6, the main nozzle 7 and the plurality of sub-nozzles 8, respectively. . The target position is set in accordance with the width of the fabric on the weft-insertion end side, which is the side farther from the main nozzle 7 in the longitudinal direction of the reed 9 .

The weft feeler 10 is composed of, for example, an optical sensor. The weft feeler 10 outputs a detection signal when the tip of the weft 11 flying by the air injection from each nozzle 6, 7, 8 reaches a target position. Therefore, the target position reaching timing is the timing when the weft feeler 10 outputs the detection signal.

The control device 31 controls the operation of the weft insertion device 1 . The control device 31 is configured by, for example, a central processing unit, a ROM (Read-Only Memory), a RAM (Random Access Memory), and the like. The control device 31 has a nozzle control section 311, a storage section 312, and a selection section 313, as shown in FIG. The nozzle control unit 311 controls the injection of air by the tandem nozzle 6 by opening and closing the tandem valve 14 . Further, the nozzle control unit 311 controls the injection of air by the main nozzle 7 by opening and closing the main valve 12 . Further, the nozzle control unit 311 controls the injection of air by the plurality of sub-nozzles 8 by opening and closing the plurality of sub-valves 22 .

The storage unit 312 stores a plurality of injection amount reduction patterns prepared in advance to reduce the amount of air injected by the plurality of sub-nozzles 8 . The plurality of injection amount reduction patterns stored in the storage unit 312 are, for example, injection amount reduction pattern 0, injection amount reduction pattern 1, injection amount reduction pattern 2, injection amount reduction pattern 3, . It includes an amount reduction pattern m-1 and an injection amount reduction pattern m. Among them, the injection amount reduction pattern 0 is the initial setting pattern when reducing the air injection amount of the sub-nozzle 8, and the other injection amount reduction patterns 1 to m are selected when reducing the air injection amount of the sub-nozzle 8. Candidate pattern.

The amount of air injected by the plurality of sub-nozzles 8 can be reduced by shortening the opening period of each sub-valve 22 when opening and closing the plurality of sub-valves 22 corresponding to the sub-nozzles 8 of each group. The open period of the sub-valve 22 is the period from when the sub-valve 22 is opened to when it is closed. The amount of air injected by the sub-nozzle 8 can be reduced by changing at least one of the timing for opening the sub-valve 22 and the timing for closing the sub-valve 22 . In order to reduce the amount of air injected by the sub-nozzles 8, it is not necessary to shorten the open periods of all the sub-valves 22, and it is possible to shorten the open periods of some of the sub-valves 22 only.

Here, when the reduction amount of the air injection amount is compared among the plurality of injection amount reduction patterns 0 to m shown in FIG. The reduction amount of 2 is larger than the injection amount reduction pattern 1 . Further, the reduction amount of the injection amount reduction pattern m is larger than that of the injection amount reduction pattern m−1. That is, the reduction amount increases stepwise from the injection amount reduction pattern 0 to the injection amount reduction pattern m, with the reduction amount of the injection amount reduction pattern 0 being the minimum and the reduction amount of the injection amount reduction pattern m being the maximum.

The selection unit 313 selects one injection amount reduction pattern from among the plurality of injection amount reduction patterns 0 to m described above. The selection of the injection amount reduction pattern by the selection unit 313 may be performed according to the operator's operation, or may be performed without the operator's operation. When the injection amount reduction pattern is selected according to the operator's operation, the injection amount reduction patterns 1 to m are displayed as selection candidates on the display section of the function panel 32, and the operator can perform key operation, touch operation, etc. from among the selection candidates. The injection amount reduction pattern specified by is selected. When the injection amount reduction pattern is selected without intervention of the operator, the injection amount reduction patterns 1 to m are selected as candidates for selection, and the injection amount reduction patterns are selected in order from the one with the smallest air injection amount reduction amount. good. In this embodiment, the selection unit 313 selects an injection amount reduction pattern without intervention of an operator's operation.

The function panel 32 is connected to the control device 31 as an input/output device for various data necessary for weft insertion. The function panel 32 has a display section and an input section. A setting screen for weft insertion of the weft 11 is displayed on the display section. The data input using the function panel 32 includes at least the type of weft yarn 11 to be used for weft insertion. The type of weft 11 can be identified by the material and count of the weft 11 . The type of the weft yarn 11 to be used for weft insertion is input by the operator's input operation while the setting screen is displayed on the display unit.

Next, a control method for the air jet loom according to the embodiment of the invention will be described.
FIG. 4 is a flow chart showing an example of processing performed for setting the injection amount reduction pattern in the weft insertion device of the air jet loom according to the embodiment of the present invention. The processing shown in this flowchart is performed by the control device 31 having the configuration shown in FIG.

First, the nozzle control unit 311 sets the value of the variable i to 1 (step S1).
Next, the selection unit 313 selects the injection amount reduction pattern i corresponding to the variable i from among the plurality of injection amount reduction patterns 0 to m stored in the storage unit 312 (step S2). Since the variable i is set to 1 at this stage, the selector 313 selects the injection amount reduction pattern 1 .

Next, the nozzle control unit 311 controls air jetting from the plurality of sub-nozzles 8 based on the jetting amount reduction pattern i selected in the previous step S2 to perform trial weaving (step S3). When trial weaving is performed, the nozzle control unit 311 controls not only air jetting from the plurality of sub-nozzles 8, but also air jetting from the tandem nozzles 6 and air jetting from the main nozzles 7, thereby controlling the weft yarn 11. Insert the weft. In addition, test weaving based on the selected ejection amount reduction pattern is performed for a plurality of picks per test weave. The number of picks per trial weave is set, for example, in the range of several hundred picks to several thousand picks.

When trial weaving is performed, the weft state detection sensor 3 detects the mass of the weft as a physical property value of the weft inserted by the tandem nozzle 6 and the main nozzle 7 and notifies the controller 31 of the detection result. The weft feeler 10 also detects the target position arrival timing Tw at which the weft inserted by the trial weaving reaches the target position, and notifies the control device 31 of the detection result. Then, the nozzle control unit 311 identifies the mass of the weft using the detection result of the weft state detection sensor 3 obtained in one trial weaving (step S4). As a specific example, the nozzle control unit 311 sequentially adds the weft masses detected by the weft state detection sensor 3 for each pick in one trial weaving, and calculates the added value as the weight of the pick per trial weaving. Determine the weft mass by dividing by the number. Further, the nozzle control section 311 specifies the target position arrival timing Tw using the detection result of the weft feeler 10 obtained in one trial weaving (step S5). As a specific example, the nozzle control unit 311 sequentially adds the amount of deviation between the target position arrival timing Tw of the weft detected by the weft feeler 10 and the reference arrival timing for each pick in one trial weaving. The target position arrival timing Tw is specified by dividing the value by the number of picks per test weave. Either the process of step S4 or the process of step S5 may be performed first. Further, the method of specifying the weft mass and the method of specifying the target position arrival timing Tw are not limited to the above methods, and other methods may be employed.

Next, the nozzle control unit 311 confirms whether or not the mass of the weft identified in step S4 is within a preset range (step S6). The predetermined range is defined by a predetermined numerical range around the reference value of the weft mass. Then, if the mass of the specified weft yarn is out of the predetermined range, the process returns from step S6 to step S3 and the trial weaving is performed again. As a result, trial weaving is repeated until the mass of the weft identified in step S4 falls within a predetermined range.

On the other hand, if the identified weft mass is within the predetermined range, the nozzle control unit 311 checks whether the target position arrival timing Tw identified in step S5 is within a preset allowable range (step S7). The allowable range is defined by a predetermined time width around the target value of the target attainment timing. If the detected target position arrival timing Tw is within the preset allowable range, it is determined Yes in step S7, that is, it is determined that the injection amount reduction pattern selected in step S2 is appropriate. In this case, the process proceeds from step S7 to step S8. Then, in step S8, the value of the variable i is incremented by one. This sets the variable i to two. Therefore, when returning from step S8 to step S2, the selection unit 313 selects the injection amount reduction pattern 2. FIG. The injection amount reduction pattern selected by the selection unit 313 in step S2 is changed to an injection amount reduction pattern with a larger air injection amount reduction each time the value of the variable i is incremented in step S8.

On the other hand, if the specified target position arrival timing Tw is out of the allowable range, it is determined No in step S7, that is, it is determined that the injection amount reduction pattern selected in step S2 is inappropriate. In this case, the process proceeds from step S7 to step S9. Then, in step S9, the nozzle control unit 311 sets the final sub-nozzle injection amount reduction pattern based on the value of the variable i at that time. For example, if the value of the variable i is 4 when it is determined No in step S7, injection amount reduction patterns 1 to 3, which are determined to be appropriate until i=4, are selected. The injection amount reduction pattern 3 or the injection amount reduction pattern 2, which has a smaller reduction amount than the amount reduction pattern 4, is set as the final injection amount reduction pattern for the sub-nozzles. The final injection amount reduction pattern of the sub-nozzles is the injection amount reduction pattern that is applied to the actual operation after the trial weaving.

As described above, in the embodiment of the present invention, when setting the ejection amount reduction pattern of the sub-nozzles, not only the target position arrival timing detected by the weft feeler 10 but also the target position arrival timing detected by the weft state detection sensor 3 is detected. The appropriateness of the ejection amount reduction pattern is determined by taking into consideration the physical property values of the weft yarn. Therefore, it is possible to more appropriately determine the suitability of the injection amount reduction pattern for reducing the air injection amount of the sub-nozzles.

Further, when the physical property value of the weft identified by the nozzle control unit 311 is out of the predetermined range, test weaving is repeated until the physical property value of the weft falls within the predetermined range. It is possible to determine the appropriateness of the injection amount reduction pattern under certain conditions.

The effects of the embodiments of the present invention will be described below with specific examples.
FIG. 5 is a diagram showing the relationship between the weft target position arrival timing and the weft mass, in which the vertical axis indicates the target position arrival timing Tw and the horizontal axis indicates the weft mass.
As shown in FIG. 5, as the weft mass increases, the target position arrival timing Tw becomes later, and as the weft mass decreases, the target position arrival timing Tw becomes earlier. Here, assuming that the reference value of the weft mass is gm, the predetermined range E of the weft mass is defined around the reference value gm. Further, the weft mass g1 specified based on the detection result of the weft state detection sensor 3 at time t1 is the same value as the reference value gm, and the detection result of the weft state detection sensor 3 is obtained at time t2 after time t1. Assume that the mass g2 of the weft yarn specified based on the above is outside the predetermined range E and smaller than the reference value gm. Furthermore, at time t3 after time t2, the weft mass g3 specified based on the detection result of the weft state detection sensor 3 is outside the predetermined range E, is smaller than the reference value gm, and is larger than the mass g2. value. In this case, the weft mass gradually decreases from time t1 to time t2, and after the change in mass reverses from a decreasing trend to an increasing trend at time t2, it gradually increases from time t2 to time t3. ing.

FIG. 6 shows a case in which the mass of the weft does not change over time and a case in which the mass of the weft changes over time in test weaving performed to set the ejection amount reduction pattern of the sub-nozzles. is a diagram for explaining the relationship between the weft arrival timing at the target position and the reduction amount of the sub-nozzle injection amount. In FIG. 6, the vertical axis indicates the target position arrival timing Tw, and the horizontal axis indicates the time corresponding to the number of picks. there is In FIG. 6, the curve A shows the change in the target position arrival timing Tw when the weft mass does not change with the passage of time, and the target position arrival timing Tw when the weft mass changes with the passage of time. Curve B shows the change in Tw.

First, when the mass of the weft does not change with time, as shown by curve A in FIG. The target position arrival timing Tw hardly changes. However, after the time Ts has elapsed, the target position arrival timing Tw is delayed as the sub-nozzle injection amount reduction amount increases. The reason for this is that the target position arrival timing Tw is almost constant when the amount of air injection from the sub-nozzles 8 is secured above an appropriate amount, and when the amount of air injection from the sub-nozzles 8 is less than the appropriate amount, the amount of air injection is insufficient. is slowed down by In this case, it is determined that all of the ejection amount reduction patterns selected for trial weaving until the time Ts has passed are appropriate. Therefore, the injection amount reduction pattern to be applied to the actual operation after trial weaving is set to the injection amount reduction pattern that provides the reduction amount before the target position arrival timing Tw starts to be delayed.

On the other hand, it is assumed that the target position arrival timing Tw changes as shown by the curve B in FIG. 6 when the mass of the weft yarn changes over time as shown in FIG. In this case, from time t1 to time t2, although the weft mass decreases from mass g1 to mass g2 as shown in FIG. As shown by curve B, there is almost no change from time t1 to time t2. As a result, during the period from time t1 to time t2, the decrease in the mass of the weft yarn accelerates the target arrival timing, and the increase in the reduction amount of the sub-nozzle injection amount delays the target arrival timing. means that

On the other hand, at time t2 in FIG. 6, the target position arrival timing Tw abruptly changes in a later direction, and thereafter, until time t3, the target position arrival timing Tw is gradually delayed. . This is because the change in the weft mass reverses from a decreasing trend to an increasing trend at time t2 in FIG. 5, and thereafter the weft mass gradually increases until time t3. In this case, if the appropriateness of the injection amount reduction pattern is determined based only on the target position arrival timing Tw, all the injection amount reduction patterns selected in the trial weaving from time t1 to time t2 in FIG. 6 are determined to be appropriate. be. Therefore, the injection amount reduction pattern that is applied to the actual operation after trial weaving is set to the injection amount reduction pattern that obtains the reduction amount at time t2 or the reduction amount at a time slightly before time t2. However, when the air jet loom is operated by applying the injection amount reduction pattern set in this way to actual operation, the physical property values of the weft yarn used in the trial weaving and the physical property values of the weft yarn used in the actual operation differ from each other. Due to the difference, the amount of reduction in the amount of air injection is too large, causing a delay in the timing of reaching the target position, which increases the possibility of causing a weft insertion error.

Therefore, in the embodiment of the present invention, the physical property value of the weft specified by using the detection result of the weft state detection sensor 3 when trial weaving is performed is used as a basis for determination, instead of making a determination based only on the target position arrival timing Tw. In addition, it judges whether the injection amount reduction pattern is appropriate. Therefore, even if the mass of the weft fluctuates beyond the predetermined range E as shown in FIG. It is no longer judged that the injection amount reduction pattern selected by the trial weaving is appropriate. On the other hand, if the weft mass is within the predetermined range E and the target position arrival timing Tw is within the allowable range from time t1 to time t2 in FIG. All injection amount reduction patterns selected for trial weaving up to time t2 are determined to be appropriate. As described above, according to the embodiment of the present invention, it is possible to more appropriately determine the suitability of the injection amount reduction pattern for reducing the air injection amount of the sub-nozzles. Therefore, it is possible to more appropriately set the injection amount reduction pattern that is applied to the actual operation after trial weaving.

It should be noted that the technical scope of the present invention is not limited to the above-described embodiments, and includes forms with various modifications and improvements within the range where specific effects obtained by the constituent elements of the invention and their combinations can be derived. .

For example, in the above-described embodiment, as an example of the physical property value of the weft 11 detected by the weft state detection sensor 3, the mass of the weft is used. A configuration may be adopted in which fluff or the diameter of the weft is detected as the physical property value of the weft 11 . In addition to the mass of the weft, the fluffiness of the weft, and the diameter of the weft, if there is a physical property value of the weft that affects the target position arrival timing, the weft state detection sensor 3 detects the physical property value. may be adopted. In addition, the physical property value of the weft 11 used to determine the propriety of the injection amount reduction pattern is not limited to one physical property value. or three physical property values such as weft mass, weft fluffiness and weft diameter are detected by the weft state detection sensor 3, and each physical property value is within a predetermined range. A configuration for determining whether or not there is may be adopted.

Further, in the above-described embodiment, when the injection amount reduction pattern is selected one by one from the plurality of injection amount reduction patterns stored in the storage unit 312, the injection amount Although an example of selecting the reduction pattern has been shown, the order of selecting the injection amount reduction pattern can be arbitrarily changed in determining the suitability of the injection amount reduction pattern. Also, the trial weaving based on the injection amount reduction pattern may be performed for all the injection amount reduction patterns prepared in advance. Further, when the test weaving is repeated until the physical properties of the weft are within a predetermined range, an upper limit may be set for the number of repetitions.

1 weft insertion device 3 weft state detection sensor (first detection sensor) 6 tandem nozzle (weft insertion nozzle) 7 main nozzle (weft insertion nozzle) 8 sub-nozzle 10 weft feeler (second detection sensor) 11 weft, 311 nozzle control unit (control unit), 312 storage unit, 313 selection unit.

Claims (3)

a weft insertion nozzle for inserting the weft yarn;
a plurality of sub-nozzles arranged downstream of the weft-insertion nozzle in the weft-conveying direction;
a control unit that controls the injection of air by the plurality of sub-nozzles;
a first detection sensor for detecting a physical property value of the weft inserted by the weft insertion nozzle;
a second detection sensor for detecting a target position arrival timing at which the weft yarn inserted by the weft insertion nozzle reaches the target position;
a storage unit that stores a plurality of injection amount reduction patterns prepared in advance for reducing the amount of air injected by the plurality of sub-nozzles;
a selection unit that selects any one injection amount reduction pattern from among the plurality of injection amount reduction patterns,
The control unit performs trial weaving by controlling the jetting of air from the plurality of sub-nozzles based on the jetting amount reduction pattern selected by the selection unit, and the first pattern obtained by performing the trial weaving. Using the detection result of the detection sensor and the detection result of the second detection sensor, the physical property value of the weft inserted by the test weaving and the target position arrival timing are specified after the test weaving , The selected injection amount reduction pattern when the identified physical property value of the weft yarn is within a predetermined range and the identified target position arrival timing is within a preset allowable range. air jet loom. 2. The control unit according to claim 1, wherein, when the identified physical property value of the weft is out of the predetermined range, the control unit repeats the trial weaving until the physical property value of the weft falls within the predetermined range. air jet loom. A weft insertion nozzle for inserting a weft yarn, a plurality of sub-nozzles arranged downstream of the weft insertion nozzle in the weft conveying direction, and physical property values of the weft yarn inserted by the weft insertion nozzle. A control method for an air jet loom comprising a first detection sensor for detecting and a second detection sensor for detecting a target position arrival timing at which a weft yarn inserted by the weft insertion nozzle reaches a target position, comprising:
a step of selecting any one injection amount reduction pattern from among a plurality of injection amount reduction patterns prepared in advance for reducing the amount of air injected by the plurality of sub-nozzles;
performing trial weaving by controlling the jetting of air from the plurality of sub-nozzles based on the selected jetting amount reduction pattern;
Using the detection result of the first detection sensor and the detection result of the second detection sensor obtained by performing the trial weaving, the physical property value of the weft inserted by the trial weaving and the arrival timing of the target position are determined. a step of specifying after performing the trial weaving ;
When the identified physical property value of the weft yarn is within a predetermined range and the identified target position arrival timing is within a preset allowable range, the selected injection amount reduction pattern A control method for an air-jet loom, comprising a step of determining that is appropriate.

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