JP2017145537A - Weft insertion control method and weft insertion control device in air jet loom - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the consumption of compressed air in an air jet loom without increasing the number of faulty wefts.SOLUTION: A control device C comprises a target weft arrival timing setting section 43a, a delay limit value setting section 43b, and a feed-forward control amount setting section 43c as setting sections for setting a target weft arrival timing TWm, a delay limit value TWLim of a weft arrival timing, and a feed-forward control amount Tmα. In addition, the control device C comprises: a feed-forward control amount changing control section for changing the feed-forward control amount Tmα on the basis of the comparison of a most delayed weft arrival timing TWLat which is most delayed when weft insertion is performed under setting conditions set by the setting sections 43a-43c, with the delay limit value TWLim of a weft arrival timing TW; and a target weft arrival timing changing control section for delaying the target weft arrival timing TWm in a range in which the most delayed weft arrival timing TWLat can be made earlier than the delay limit value TWLim by feed-forward control.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a weft insertion control method and a weft insertion control device in an air jet loom, and more particularly, to a weft insertion control method and a weft insertion control in an air jet loom that performs weft insertion by air injection from a main nozzle and a sub nozzle. Relates to the device.

  Since the air jet loom includes a weft insertion mechanism that uses compressed air for weft insertion, the amount of compressed air used is directly related to the energy consumption of the weaving factory. 2. Description of the Related Art Conventionally, a weft insertion control device in an air jet loom has been proposed that reduces the energy of the air jet loom and the consumption of compressed air and increases the productivity of the air jet loom (for example, see Patent Document 1). In this weft insertion control device, the control device calculates the expected weft arrival time from the yarn parameters of the weft measured by the sensor device, and calculates the weft arrival time measured by the weft breakage stop device (weft breakage stop) Compared with the target weft arrival timing to the device). If the expected weft arrival time is shorter than the measured weft arrival time, the nozzle opening time is reduced in order to reduce compressed air consumption. In the opposite case, the nozzle opening time is slightly extended to prevent the possibility of the loom stopping.

Special table 2014-500914 gazette

  Even if weft insertion is performed under the same conditions, variations occur in the flying state of the wefts. Therefore, the weft arrival timing has a normal distribution centered on the target weft arrival timing TWm as shown in FIG. In the weft insertion control of Patent Document 1, when the expected weft arrival timing is earlier than the target weft arrival timing TWm, the nozzle open time can be reduced to reduce compressed air consumption, but the expected weft arrival timing is the target weft arrival timing. There are only cases where the timing is later than the arrival timing TWm, and in this case, the nozzle opening time is extended, so that the effect of reducing the compressed air consumption is eventually canceled out.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a weft insertion control method in an air jet loom that can reduce the consumption of compressed air in the air jet loom without increasing a weft error. And providing a weft insertion control device.

  A weft insertion control method for an air jet loom that solves the above-described problem includes a main nozzle for weft insertion and a sub nozzle for weft insertion, and is an air in which wefts are inserted by air injection from the main nozzle and the sub nozzle. This is a weft insertion control method for a jet loom. When the weft condition before the weft insertion is detected by the weft condition detection device and the weft arrival timing predicted from the weft condition detected by the weft condition detection device is later than the delay limit value, the main nozzle The feedforward control is performed to increase the air injection amount from the target, and the target weft arrival timing is delayed within the range in which the weft arrival timing can be made earlier than the delay limit value by the feedforward control.

  According to this configuration, the target weft arrival timing can be delayed without increasing weft errors, and the compressed air pressure of the main nozzle and the sub nozzle can be lowered. Therefore, it is possible to reduce the consumption of the compressed air of the air jet loom without increasing the wetting error.

  After performing the weft insertion at the target weft arrival timing for a preset time, the rate (amount) of the weft error is confirmed, and if the weft error rate is less than the preset rate, the delay limit value may be delayed. Good. In the present invention, when the ratio of weft errors is small, the target weft arrival timing can be further delayed by delaying the delay limit value, and the consumption of compressed air in the air jet loom can be further reduced.

  A weft insertion control device for an air jet loom that solves the above problems includes a main nozzle for weft insertion and a sub nozzle for weft insertion, and wefts are inserted by air injection from the main nozzle and the sub nozzle. A feed that increases the air injection amount from the main nozzle when the state of the weft yarn before being inserted by the state detection device is detected and the weft arrival timing predicted from the detected weft state is later than the delay limit value This is a weft insertion control device for an air jet loom that performs forward control. A setting unit for setting the target weft arrival timing, the delay limit value of the weft arrival timing, and the feedforward control amount; and the latest latest weft arrival timing when weft insertion is performed under the setting conditions set by the setting unit; A feedforward control amount change control unit that changes the feedforward control amount based on a comparison with the delay limit value, and a range in which the latest weft arrival timing can be made earlier than the delay limit value by the feedforward control. A target weft arrival timing change control unit that delays the target weft arrival timing.

  According to the weft insertion control device of the present invention, the target weft arrival timing can be delayed without increasing weft errors, and the compressed air pressure of the main nozzle and sub nozzle can be lowered. Therefore, it is possible to reduce the consumption of the compressed air of the air jet loom without increasing the wetting error.

  The weft insertion control device preferably includes a setting screen for displaying a setting result of the setting unit. According to this configuration, when setting the target weft arrival timing, the weft arrival time delay limit value, and the feedforward control amount by the setting unit, whether or not each set value that has been set is set to a correct value is set. Can be confirmed.

  The weft insertion control device may include a progress confirmation screen that displays the progress of weft insertion under the conditions set by the setting unit and the changed conditions. According to this configuration, the operator can appropriately determine whether or not the consumption of the compressed air of the air jet loom can be reduced by checking the progress confirmation screen.

  According to the present invention, it is possible to reduce the consumption of compressed air in an air jet loom without increasing weft errors.

The schematic block diagram of a weft insertion apparatus. The schematic diagram which shows a setting screen. The schematic diagram which shows a progress confirmation screen. The schematic diagram which shows a setting screen. The schematic diagram which shows a progress confirmation screen. The schematic diagram for demonstrating the outline | summary of invention. The schematic diagram for demonstrating the outline | summary of invention. The schematic diagram for demonstrating the outline | summary of invention. The flowchart in the case of setting target weft arrival timing. (A) is a schematic diagram of a setting screen at the start of the first step, (b) is a schematic diagram of a setting screen during execution of the first step, and (c) is a schematic diagram of a setting screen at the end of the first step. (A) is a schematic diagram of the setting screen during execution of the second step, (b) is a schematic diagram of the setting screen at the end of the second step. (A) is a schematic diagram of the setting screen during execution of the third step, (b) is a schematic diagram of the setting screen at the end of the third step. (A) is a schematic diagram of a setting screen during the second step when the value of the latest weft arrival timing by sampling differs when setting the target weft arrival timing, and (b) is a setting screen at the end of the second step. (C) is a schematic diagram of a setting screen during execution of the third step. The schematic diagram of the setting screen in 4th step implementation in case the value of the latest weft arrival timing by sampling differs when setting target weft arrival timing. The schematic diagram which shows a progress confirmation screen. The flowchart in the case of setting target weft arrival timing. The flowchart in the case of setting target weft arrival timing. (A) is a schematic diagram showing a setting screen at the time when the target weft arrival timing search routine is completed, and (b) is a schematic diagram showing a setting screen at the end of the search for the optimum target weft arrival timing. The schematic diagram which shows the progress confirmation screen after completion | finish of search for the optimal target weft arrival timing.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIG. 1, a weft insertion device 10 of an air jet loom includes a weft storage device 11, a main nozzle 12 for weft insertion, a tandem nozzle 13 disposed upstream of the main nozzle 12, and a main nozzle. 12, a plurality of weft insertion sub-nozzle groups 14 </ b> A to 14 </ b> F disposed on the downstream side of 12, and a flange 15. The eaves 15 are formed by arranging a plurality of eaves having guide recesses in the weft insertion direction. The tandem nozzle 13 includes an ABS (automatic weft braking device) 16. The sub-nozzle groups 14A to 14F have a configuration in which a plurality of (four in this embodiment) sub-nozzles 14 are collectively arranged as one group.

  The weft storage device 11 is configured to wind and store the weft Y supplied from the weft cheese 17 serving as a yarn supplying section via the weft state detection device 18 around the length measuring drum 19. The weft storage device 11 has a locking pin 20 a that is driven by an electromagnetic solenoid 20 and can be attached to and detached from the length measuring drum 19. The weft Y wound around and stored on the length measuring drum 19 is controlled to be pulled out from the length measuring drum 19 by engagement / disengagement between the locking pin 20a and the length measuring drum 19. The measuring drum 19 includes a photoelectric balloon sensor 21 that detects the balloon of the weft Y drawn from the measuring drum 19. The balloon sensor 21 detects a weft Y balloon when wefts are inserted.

  The weft state detection device 18 is the state of the weft Y. As the weft Y state, when the weft Y is inserted by the action of compressed air, the weft Y has an influence on the flight of the weft Y, the yarn mass per unit length, and the yarn diameter. , Yarn surface structure, yarn fluff, and yarn material can be continuously detected. Examples of the weft state detection device 18 include a device disclosed in Patent Document 1.

  The air supply source 22 is connected to the main tank 25 via a pipe 23 and a regulator 24. The main tank 25 is connected to the main nozzle 12 via a pipe 23 and a main valve 26, and is connected to the tandem nozzle 13 via a pipe 23 and a tandem valve 27. The air supply source 22 is connected to a sub tank 29 via a pipe 23 and a regulator 28. The main valve 26 and the tandem valve 27 are controlled by the control device C, and the injection timing of the compressed air from the main nozzle 12 and the tandem nozzle 13 is controlled. The air supply source 22 is configured by, for example, an air compressor.

  The sub tank 29 includes a plurality of sub valves 30, and each sub valve 30 is connected to a plurality of sub nozzle groups 14 </ b> A to 14 </ b> F by a pipe 23. When each sub valve 30 is opened, compressed air is simultaneously injected from the four sub nozzles 14 of the corresponding sub nozzle groups 14A to 14F. Each sub-valve 30 is controlled by the control device C, and is controlled to open and close like a relay at a predetermined timing during weft insertion, so that compressed air is relay-injected from the sub-nozzle groups 14A to 14F. A weft feeler 31 is provided on the side opposite to the main nozzle of the reed 15. The weft feeler 31 detects the end of the weft Y at the end of the weft insertion of one pick.

  The control device C includes a CPU 35 and a memory 36 as a determination unit. The control device C controls the pressure of the main tank 25 via the regulator 24 and controls the pressure of the sub tank 29 via the regulator 28. The control device C controls the injection timing of the compressed air from the main nozzle 12 and the tandem nozzle 13 by opening / closing control of the main valve 26 and the tandem valve 27. The control device C controls relay injection of the sub nozzle groups 14 </ b> A to 14 </ b> F by opening / closing control of the sub valve 30. The control device C determines whether or not the weft insertion is defective based on the detection signal of the weft feeler 31, and detects the weft arrival timing TW in each pick.

  In the control device C, various fabric conditions and weaving conditions are registered and stored. The weaving conditions include, for example, the material of the yarn used for the weft Y, the type of weft such as the count, the density of the weft, the material of the yarn used for the warp, the type of warp such as the count, the warp density, the weaving width, the fabric structure, etc. include. The weaving conditions include, for example, the rotational speed of the loom, the pressure of compressed air in the main tank 25 and the sub tank 29, the opening degree of the main valve 26 and the tandem valve 27, the weft insertion start timing, the target weft arrival timing TWm, and the like.

  A function panel 40 as an input / output device is connected to the control device C. The function panel 40 includes a display screen 41 for various data and input keys (not shown). The display screen 41 includes a setting screen 42 (shown in FIG. 2) for setting weft insertion conditions for performing weft insertion control with feed forward control (FF control) for performing weft insertion with reduced consumption of compressed air. There is a progress confirmation screen 46 (shown in FIG. 3) for confirming the progress until the setting is completed and the progress after the operation is started under the set conditions after the setting is completed.

  As shown in FIG. 2, the setting screen 42 includes a target weft arrival timing setting unit 43a that sets a target weft arrival timing TWm, a delay limit value setting unit 43b that sets a delay limit value TWLim of the weft arrival timing TW, and feedforward control. A feedforward control amount setting unit 43c for setting the amount Tmα, a latest weft arrival timing display unit 43d for displaying the latest latest weft arrival timing TWLat within a sampling period in which weft insertion is performed a plurality of times, and a sampling amount setting unit 43e Is provided. The setting screen 42 includes a comment display screen 44, a target weft arrival timing investigation switch 45a, a sampling switch 45b, and an investigation method setting switch 45c. The delay limit value TWlim of the weft arrival timing TW means a threshold value for feedforward control. The feedforward control amount Tmα means the opening adjustment amounts of the main valve 26 and the tandem valve 27.

  The CPU 35 of the control device C inserts 1000 picks set in the sampling amount setting unit 43e under the conditions set by the target weft arrival timing setting unit 43a, the delay limit value setting unit 43b, and the feedforward control amount setting unit 43c. It functions as a change control unit that changes the feedforward control amount Tmα based on a comparison between the latest latest weft arrival timing TWLat and the delay limit value TWLim of the weft arrival timing TW. In addition, the CPU 35 of the control device C also functions as a target weft arrival timing change control unit that delays the target weft arrival timing TWm within a range in which the latest weft arrival timing TWLat can be made earlier than the delay limit value TWlim by feedforward control.

  As shown in FIG. 3, the progress confirmation screen 46 includes a step display unit 47, a target weft arrival timing display unit 48a, a delay limit value display unit 48b of the weft arrival timing TW, a feedforward control amount display unit 48c, and the latest weft arrival. A timing display unit 48d, a sampling amount display unit 48e, and a comment display unit 49 are provided.

  Here, the step display unit 47 means a series of operation steps when a flowchart for performing a setting operation of the target weft arrival timing TWm described later is executed. The sampling amount indicates the sampling time or the number of picks. The comment display unit 49 is a part for displaying symbols A to C corresponding to comments displayed on the setting screen 42 when a flowchart for performing the setting operation of the target weft arrival timing TWm described later is executed.

  FIG. 4 shows an example of the setting screen 50 when setting the target weft arrival timing TWm. The setting screen 50 includes a target weft arrival timing setting unit 43a, a delay limit value setting unit 43b, a feedforward control amount setting unit 43c, and a latest weft arrival timing display unit 43d similar to the setting screen 42. The setting screen 50 includes a comment display screen 44, a target weft arrival timing investigation switch 45a, a sampling switch 45b, and an investigation method setting switch 45c. Furthermore, the setting screen 50 includes a weft error amount display unit 51a, a sampling amount display unit 51b, and a reference weft error display unit 52.

  FIG. 5 shows a part of the progress confirmation screen 53 when the target weft arrival timing TWm is set. The progress confirmation screen 53 includes a step display unit 47, a target weft arrival timing display unit 48a, a delay limit value display unit 48b, a feedforward control amount display unit 48c, a latest weft arrival timing display unit 48d, the same as the progress confirmation screen 46. A sampling amount display section 48e is provided. The progress confirmation screen 53 includes a weft error amount display unit 54 and an advice display unit 55. The advice display unit 55 performs reference numerals A to C corresponding to comments displayed on the setting screen 50 when executing a flowchart for setting the target weft arrival timing TWm described later or a flowchart for searching for the optimum target weft arrival timing. , F are displayed.

  Even if the weft insertion is performed in the same state, variations occur in the flying state of the weft Y. Therefore, the weft arrival timing TW of the weft Y has a normal distribution as shown in FIG. If the weft arrival timing TW is later than the machine base angle X and it is known in advance that the probability of a weft error is very high, the normal distribution of the weft arrival timing TW should not exceed the straight line L indicating the machine angle X. Then, a target weft arrival timing TWm that is the median value of the normal distribution is set. If the straight line L indicating the machine base angle X is a weft miss occurrence frequent boundary line and the weft arrival timing TW is earlier than the machine base angle X, the occurrence of a weft error is reduced. The control device C predicts the weft arrival timing TW based on the state of the weft Y detected by the weft state detection device 18, and when the weft Y is inserted, the predicted weft arrival timing TW is later than the delay limit value TWlim. By increasing the opening degree of the main valve 26 and the tandem valve 27 by the feedforward control amount Tmα by feedforward control, the air injection amount from the main nozzle 12 and the tandem nozzle 13 is increased, and the actual weft arrival timing TW is set as a delay limit value. It is made earlier than TWLim (see FIG. 7).

  By performing the feedforward control as shown in FIG. 7, the weft arrival timing TW does not exceed the delay limit value TWLim, so the target weft arrival timing TWm can be delayed by that amount (solid line in FIG. 8). Thereby, the pressure of the main tank 25 and the sub tank 29 can be lowered | hung and consumption of compressed air can be decreased.

Next, a case where the target weft arrival timing TWm is set will be described. The control device C searches for the optimum target weft arrival timing TWm according to the flowchart of FIG.
First, in step S1, initial setting for setting the target weft arrival timing TWm, the delay limit value TWlim, and the feedforward control amount Tmα is performed. As the values of the target weft arrival timing TWm, the delay limit value TWlim, and the feedforward control amount Tmα, values input by the operator while the setting screen 42 is displayed on the display screen 41 of the function panel 40 are used. At this time, the setting screen 42 shown in FIG. In this state, when the operator presses the target weft arrival timing investigation switch 45a on the setting screen 42, weft insertion is started. Then, the setting screen 42 shown in FIG. 10B is displayed on the display screen 41. The numerical value is displayed in the machine base angle (the rotation angle of the loom).

  After the weft insertion is started, the weft arrival timing TW is controlled in step S2, and it is determined in step S3 whether or not the weft arrival timing TW is stable. The weft arrival timing TW being stable means that the weft arrival timing TW is within a preset range. When the weft arrival timing TW is stabilized in step S3, the process proceeds to step S4, sampling for 1000 weft insertions is performed, and data of the weft arrival timing TW of each pick is stored in the memory 36. Next, the process proceeds to step S5, and the control device C determines whether or not the latest weft arrival timing TWLat is equal to the delay limit value TWLim based on the sampling data. Since the latest weft arrival timing TWLat = 265 ° and the delay limit value TWlim = 260 °, the control device C proceeds to step S6, and determines whether or not the latest weft arrival timing TWLat is greater than the delay limit value TWLim. Since the latest weft arrival timing TWLat = 265 ° and the delay limit value TWlim = 260 °, the process proceeds to step S7, where it is determined whether or not the feedforward control amount Tmα is 30 °. Since Tmα = 0 °, the control device C proceeds to step S8, and the comment display screen 44 of the setting screen 42 has a comment display of A “There is a delay of TW. Increase the FF control amount by 15 °. "Is displayed. As a result, the setting screen 42 is in the state shown in FIG. The first step is completed in steps S2 to S8.

  When the operator confirms the display of “There is a delay of TW. Increase the FF control amount by 15 °” on the comment display screen 44, the worker sets the angle set in the feedforward control amount setting unit 43 c of the setting screen 42. An operation of adding 15 ° is performed, and step S9 is executed.

  After step S9 is executed, the control device C executes step S2 and starts the second step. That is, when the second step is started, the feedforward control amount Tmα is changed to 15 ° instead of the feedforward control amount Tmα = 0 °, which is different from the first step.

  Next, the control device C performs steps S2 to S4 in the same manner as the first step. As a result of sampling in step S4, the latest weft arrival timing TWLat has changed from 265 ° to 260 °. Therefore, the setting screen 42 shown in FIG. Since the delay limit value TWlim and the latest weft arrival timing TWLat are both 260 °, the determination result in step S5 is YES, and the controller C proceeds to step S10 to determine whether the feedforward control amount Tmα = 30 °. Judgment is made. At this stage, since the feedforward control amount Tmα = 15 °, the process proceeds to step S11, and the comment display screen 44 of the setting screen 42 is displayed with a comment display of B “FF control amount is increased by 15 ° and TWm is delayed by 5 °. Please display ". As a result, the setting screen 42 is in the state shown in FIG. The second step is completed from step S2 to step S5, step S10, and step S11.

  When the operator confirms on the comment display screen 44 that “please increase the FF control amount by 15 ° and delay TWm by 5 °”, the angle is set to the feedforward control amount setting unit 43c of the setting screen 42. The operation of adding 15 ° and adding 5 ° to the angle set in the target weft arrival timing setting unit 43a is performed, and step S12 is executed.

  After step S12 is executed, the control device C executes step S2 and starts the third step. That is, when the third step is started, the feed forward control amount Tmα is changed to 30 ° instead of the feedforward control amount Tmα = 15 °, which is different from the second step.

  Next, the control device C performs steps S2 to S4 in the same manner as the second step. As a result of the sampling in step S4, the latest weft arrival timing TWLat remained 260 °. Therefore, the setting screen 42 shown in FIG. Since the delay limit value TWlim and the latest weft arrival timing TWLat are both 260 °, the determination result in step S5 is YES, and the controller C proceeds to step S10 to determine whether the feedforward control amount Tmα = 30 °. Judgment is made. At this stage, since the feedforward control amount Tmα = 30 °, the process proceeds to step S13, and the comment display screen 44 of the setting screen 42 displays “Cm comment display“ TWm search end (FF control amount has reached the limit. .) ”Is displayed. As a result, the setting screen 42 is in the state shown in FIG. The third step is completed from step S2 to step S11. Then, the search for the optimum target weft arrival timing TWm ends, and the air jet loom performs weaving with the target weft arrival timing TWm and the feedforward control amount Tmα at the end of the third step. When the progress confirmation screen 46 is displayed on the display screen 41 after the search for the target weft arrival timing TWm is completed, the progress confirmation screen 46 shown in FIG. 3 is displayed. That is, since the search for the target weft arrival timing TWm has been completed in three steps, the progress confirmation screen 46 displays the target weft arrival timing TWm and the delay limit value TWLim when the first step, the second step, and the third step are performed. , Feedforward control amount Tmα, latest weft arrival timing TWLat, sampling number, and comment display content are displayed.

  Next, an example in which the values of the latest weft arrival timing TWLat by sampling in step S2 are different even when the initial settings of the target weft arrival timing TWm, delay limit value TWlim, and feedforward control amount Tmα are the same will be described. . The control device C searches for the optimum target weft arrival timing TWm according to the flowchart of FIG.

  In the first step, since the value of the latest weft arrival timing TWLat obtained by sampling in step S4 is the same, steps S2 to S9 are performed in the same manner as described above. Then, the operator confirms the comment display screen 44 of the setting screen 42 in FIG. 10C and performs an operation of adding 15 ° to the angle set in the feedforward control amount setting unit 43c of the setting screen 42. After step S9 is executed, the control device C executes step S2 and starts the second step.

  In this example, as a result of the sampling in step S4 of the second step, the latest weft arrival timing TWLat changes from 265 ° to 255 °. Therefore, a setting screen 42 shown in FIG. Since the latest weft arrival timing TWLat is 255 ° with respect to the delay limit value TWLim of 260 °, the determination result in step S5 is NO, and the control device C proceeds to step S6, where the latest weft arrival timing TWLat is reached. Is greater than the delay limit value TWlim. Since the latest weft arrival timing TWLat = 255 ° and the delay limit value TWlim = 260 °, the process proceeds to step S14, and the comment display screen 44 of the setting screen 42 shows the comment display of D “TWm with the FF control amount as it is” "Please delay 5 °". As a result, the setting screen 42 is in the state shown in FIG. The second step is completed from step S2 to step S6, step S14 and step S15.

  When the operator confirms that “Please delay TWm by 5 ° with the FF control amount as it is” on the comment display screen 44, the operator performs an operation of adding 5 ° to the angle of the target weft arrival timing TWm on the setting screen 42. Step S15 is executed.

  After step S15 is executed, the control device C executes step S2 and starts the third step. That is, when the third step starts, the target weft arrival timing TWm is changed to 245 ° instead of 240 °, which is different from the second step.

  Next, the control device C performs steps S2 to S4 in the same manner as the first step. As a result of sampling in step S4, the latest weft arrival timing TWLat changed from 255 ° to 260 °. Therefore, a setting screen 42 shown in FIG.

  Next, in step S5, the control device C determines whether or not the latest weft arrival timing TWLat is equal to the delay limit value TWlim, and the latest weft arrival timing TWLat = 260 ° and the delay limit value TWlim = 260 °. Therefore, the control device C proceeds to step S10 and determines whether or not the feedforward control amount Tmα = 30 °. At this stage, since the feedforward control amount Tmα = 15 °, the process proceeds to step S11, and the comment display screen 44 of the setting screen 42 is displayed with a comment display of B “FF control amount is increased by 15 ° and TWm is delayed by 5 °. Please display ". As a result, the setting screen 42 is in a state where the angle set in the target weft arrival timing setting unit 43a is 245 ° in FIG. The third step is completed from step S2 to step S11.

  When the operator confirms on the comment display screen 44 that “please increase the FF control amount by 15 ° and delay TWm by 5 °”, the angle is set to the feedforward control amount setting unit 43c of the setting screen 42. An operation of adding 15 ° and adding 5 ° to the angle of the target weft arrival timing TWm is performed, and step S12 is executed.

  After step S12 is executed, the control device C executes step S2 and starts the fourth step. That is, at the beginning of the fourth step, the feedforward control amount Tmα is changed to 30 ° instead of the feedforward control amount Tmα = 15 °, and the target weft arrival timing TWm is changed to 250 ° instead of 245 °. Different from the third step.

  Next, the control device C performs steps S2 to S4 in the same manner as the third step. As a result of sampling in step S4, the latest weft arrival timing TWLat was 260 °. Therefore, a setting screen 42 shown in FIG. 14 is displayed on the display screen 41.

  Next, in step S5, the control device C determines whether or not the latest weft arrival timing TWLat is equal to the delay limit value TWlim, and the latest weft arrival timing TWLat = 260 ° and the delay limit value TWlim = 260 °. Therefore, the control device C proceeds to step S10 and determines whether or not the feedforward control amount Tmα = 30 °. At this stage, since the feedforward control amount Tmα = 30 °, the process proceeds to step S13, and the comment display screen 44 of the setting screen 42 displays “Cm comment display“ TWm search end (FF control amount has reached the limit. .) ”Is displayed. As a result, the setting screen 42 is in a state where the angle set in the target weft arrival timing setting unit 43a in the setting screen 42 in FIG. 12B is changed to 250 °. The fourth step is completed from step S2 to step S5, step S10, and step S13. Then, the search for the target weft arrival timing TWm ends, and the air jet loom performs weaving with the target weft arrival timing TWm and the feedforward control amount Tmα at the end of the fourth step.

  When the progress confirmation screen 46 is displayed on the display screen 41 after the search for the target weft arrival timing TWm is completed, the progress confirmation screen 46 shown in FIG. 15 is displayed. That is, since the search for the target weft arrival timing TWm is completed in four steps, the progress confirmation screen 46 displays the target weft arrival timing TWm when the first step, the second step, the third step, and the fourth step are performed. The delay limit value TWlim, the feedforward control amount Tmα, the latest weft arrival timing TWLat, the number of samplings, and the comment display content are displayed.

  Next, a case where the target weft arrival timing TWm is set while changing the delay limit value TWLim in consideration of a wetting error will be described. The loom is operated at the target weft arrival timing TWm set as described above, and the target weft arrival timing TWm is changed to a more appropriate state based on the ratio of weft errors that occur when the loom is operated for a predetermined time set in advance. To do.

The control device C searches for the optimum target weft arrival timing TWm according to the flowcharts of FIGS. 16 and 17.
As shown in FIG. 16, in step S1, an initial setting for setting a target weft arrival timing TWm, a delay limit value TWlim, and a feedforward control amount Tmα is performed. As the values of the target weft arrival timing TWm, the delay limit value TWlim, and the feedforward control amount Tmα, values input by the operator in a state where the setting screen 50 shown in FIG. 4 is displayed on the display screen 41 of the function panel 40 are used. The The operator also inputs the numerical values of the sampling amount display part 51b and the reference side error display part 52 of the setting screen 50. In this state, when the operator presses the target weft arrival timing investigation switch 45a on the setting screen 50, weft insertion is started, and the “S1: TWm search routine” in the flowchart of FIG. 16 is executed.

  As shown in FIG. 17, the “S1: TWm search routine” is the same as the flowchart of FIG. 9 described above. Therefore, the results of the first step (S1-1), the second step (S1-2), and the third step (S1-3) shown in FIG. 19 are the same as those in the first embodiment, and “S1” in the flowchart of FIG. Step S102 and subsequent steps after “: TWm search routine” will be described.

  At the end of the “S1: TWm search routine”, the angles of the target weft arrival timing TWm, the delay limit value TWlim, and the feedforward control amount Tmα are 245 °, 260 °, and 30 °, respectively. A search for the weft arrival timing TWm is performed. In step S102, the weft arrival timing TW is controlled. In step S103, it is determined whether or not the weft arrival timing TW is stable. If it is determined in step S103 that the weft arrival timing TW is stable, the process proceeds to step S104 where weft insertion data for 2 hours is sampled and the weft arrival timing TW data of each pick is stored in the memory 36. Is done. That is, if it is determined in step S103 that the weft arrival timing TW is stable, the air jet loom proceeds to step S104, and the target weft arrival timing TWm, delay limit value TWLim, and feedforward control amount Tmα in that state are used. Weaving is performed for a predetermined time (2 hours in this embodiment) set in advance, and the weft arrival timing TW of each pick during that time is sampled.

  Then, after weaving is performed for 2 hours, the control device C confirms the angle of the latest weft arrival timing TWLat and the weft error amount (lines / hr) from the sampling result, and the display screen 41 shows in FIG. A setting screen 50 is displayed. Further, the control device C proceeds to step S105 in the flowchart of FIG. 16 and determines whether or not the latest weft arrival timing TWLat is larger than the delay limit value TWLim + 5 ° based on the sampling data. Since the latest weft arrival timing TWLat = 260 ° and the delay limit value TWLim = 260 °, the control device C proceeds to step S106, and whether or not the weft miss amount (Wmiss) is larger than the reference weft miss (2 / hr). Determine whether. Since the weft error amount is 0.5 / hr, the process proceeds to step S107, and the comment display screen 44 of the setting screen 50 displays "Please delay TWLim by 5 degrees." The optimal target weft arrival timing search first step (BS1) is completed from step S102 to step S107.

  When the operator confirms the message “Please delay TWLim by 5 °” on the comment display screen 44, the operator adds 5 ° to the angle of the delay limit value setting unit 43b of the setting screen 50, and sets the delay limit value TWLim to 5 °. An operation of delaying is performed, and step S108 is executed.

  After step S108 is executed, the control device C executes “S1: TWm search routine” shown in FIG. At the start of the current “S1: TWm search routine”, the target weft arrival timing TWm is 245 ° and the delay limit value TWLim is 265 °, which is different from the previous time.

  After the weft insertion is started, the weft arrival timing TW is controlled in step S2, and when the weft arrival timing TW is stabilized in step S3, the process proceeds to step S4, and sampling for 1000 weft insertions is performed. The data of the weft arrival timing TW is stored in the memory 36. Next, the process proceeds to step S5, and the control device C determines whether or not the latest weft arrival timing TWLat is equal to the delay limit value TWLim based on the sampling data. Since the latest weft arrival timing TWLat = 260 ° and the delay limit value TWlim = 265 °, the control device C proceeds to step S6, and determines whether or not the latest weft arrival timing TWLat is greater than the delay limit value TWLim. Since the latest weft arrival timing TWLat = 260 ° and the delay limit value TWLim = 265 °, the control device C proceeds to step S14, and the comment display screen 44 of the setting screen 50 displays a comment “D” as it is. “Please delay TWm by 5 ° by the controlled variable” is displayed. The first step (BS2-1) of the “S1: TWm search routine” for the second step (BS2) for searching for the optimum target weft arrival timing is completed in steps S2 to S6 and S14.

  When the operator confirms the display of “Please delay TWm by 5 ° with the FF control amount as it is” on the comment display screen 44, the target weft arrival timing TWm set in the target weft arrival timing setting unit 43a of the setting screen 50 is displayed. An operation of delaying the target weft arrival timing TWm by 5 ° is performed by adding 5 ° to the angle and step S15 is executed.

  After step S15 is executed, the control device C executes step S2 and executes the second step (BS2-2) of “S1: TWm search routine” for the optimal target weft arrival timing search second step (BS2). To start. At the start of the second step (BS2-2), the target weft arrival timing is changed to 250 ° instead of 245 °, which is different from the first step (BS2-1).

  Next, the control device C performs steps S2 to S4 in the same manner as the first step (BS2-1). As a result of sampling in step S4, the latest weft arrival timing TWLat changed from 260 ° to 265 °.

  Next, in step S5, the control device C determines whether or not the latest weft arrival timing TWLat is equal to the delay limit value TWLim, and the latest weft arrival timing TWLat = 265 ° and the delay limit value TWLim = 265 °. Therefore, the control device C proceeds to step S10 and determines whether or not the feedforward control amount Tmα = 30 °. At this stage, since the feedforward control amount Tmα = 30 °, the process proceeds to step S17, and the comment display screen 44 of the setting screen 50 displays “Cm comment display“ TWm search end (FF control amount has reached the limit. .) ”Is displayed. As a result, the setting screen 50 is in the state shown in FIG. The second step (BS2-2) of “S1: TWm search routine” for the second step (BS2) for the optimum target weft arrival timing search (BS2) is completed through steps S2 to S5, step S10, and step S17. The second step of searching for the weft arrival timing (BS2) ends.

  Then, the air jet loom performs weaving at the target weft arrival timing TWm, the delay limit value TWlim, and the feedforward control amount Tmα at the end of the second step (BS2) for searching the optimum target weft arrival timing. While weaving is being performed, the weft insertion data is sampled by the control device C, and the data of the weft arrival timing TW of each pick and the amount (number) of weft errors are stored in the memory 36.

  After weaving is performed for 2 hours, the control device C proceeds to step S105 in the flowchart of FIG. 16, and determines whether the latest weft arrival timing TWLat is greater than the delay limit value TWlim + 5 ° based on the sampling data. Since the latest weft arrival timing TWLat = 265 ° and the delay limit value TWLim = 265 °, the control device C proceeds to step S106, and whether or not the weft miss amount (Wmiss) is larger than the reference weft miss (2 / hr). Determine whether. Since the weft error amount is 0.5 / hr, the process proceeds to step S107, and the comment display screen 44 of the setting screen 50 displays "Please delay TWLim by 5 degrees."

  When the operator confirms the message “Please delay TWLim by 5 °” on the comment display screen 44, the worker adds 5 ° to the angle set in the delay limit value setting unit 43 b of the setting screen 50, and the delay limit value TWLim. Is delayed by 5 °, and step S108 is executed.

  Next, the control device C executes “S1: TWm search routine” shown in FIG. At the start of the current “S1: TWm search routine”, the difference is that the weft arrival timing TW is 250 ° and the delay limit value TWLim is 270 °.

  The control device C performs steps S2 to S4 in the same manner as the first step. As a result of the sampling in step S4, the latest weft arrival timing TWLat changed from 265 ° to 270 °. In step S5, the control device C determines whether or not the latest weft arrival timing TWLat is equal to the delay limit value TWLim based on the sampling data. Since the latest weft arrival timing TWLat = 270 ° and the delay limit value TWlim = 270 °, the control device C proceeds to step S10 and determines whether or not the feedforward control amount Tmα = 30 °. At this stage, since the feedforward control amount Tmα = 30 °, the process proceeds to step S17, and the comment display screen 44 of the setting screen 50 displays “Cm comment display“ TWm search end (FF control amount has reached the limit. .) ”Is displayed. As a result, the setting screen 50 is in a state in which the values of the delay limit value setting unit 43b and the latest weft arrival timing display unit 43d in FIG. 18B are changed to 270 °.

  Next, the control device C performs steps S102 to S103 in the flowchart of FIG. 16 in the same manner. When it is determined in step S103 that the weft arrival timing TW is stable, the process proceeds to step S104, where weft insertion data for two hours is inserted. And the number of weft misses is counted, and the result is stored in the memory 36. As a result, the latest weft arrival timing TWLat was 270 ° and the weft miss was 3 / hr.

  Then, the control device C proceeds to step S105 in the flowchart of FIG. 16, and determines whether or not the latest weft arrival timing TWLat is larger than the delay limit value TWLim + 5 ° based on the sampling data. Since the latest weft arrival timing TWLat = 270 ° and the delay limit value TWLim = 270 °, the control device C proceeds to step S106, and whether or not the weft miss amount (Wmiss) is larger than the reference weft miss (2 / hr). Determine whether. Since the weft error amount is 3 / hr, the control device C proceeds to step S109, delays the delay limit value TWLim by 5 °, and decreases the target weft arrival timing TWm by 5 °. Next, the control device C proceeds to step S110, displays the comment display screen 44 of the setting screen 50, "GWLM search ends", and the optimum target weft arrival timing search is performed. finish.

  In step S105 of the flowchart shown in FIG. 16, if the latest weft arrival timing TWLat is larger than the delay limit value TWlim + 5 °, the control device C proceeds to step S112, and the comment display screen 44 of the setting screen 50 displays E. The comment display “Please advance TWm by 5 °” is displayed. When the operator confirms the message “Please advance TWm by 5 °” on the comment display screen 44, the operator subtracts 5 ° from the angle displayed on the target weft arrival timing display section 48a of the setting screen 50 to reach the target weft arrival. An operation of advancing the timing by 5 ° is performed, and step S113 is executed. After step S113 is executed, the control device C executes “S1: TWm search routine” shown in FIG.

  After the optimal target search in consideration of the weft error is completed, the progress confirmation screen 53 shown in FIG. 19 is displayed when the progress confirmation screen 53 is displayed on the display screen 41 for the history of the search process. When the optimum target search is performed once, a progress confirmation screen 53 showing the process until the operation sampling for 2 hours is completed once is displayed, and when the optimum target search is performed twice, 2 is displayed. A progress confirmation screen 53 is displayed that shows the process until the time operation sampling is completed twice.

  When the operator sets the target weft arrival timing TWm when the delay limit value TWLim is not changed in accordance with the ratio of the weft error, the setting screen 42 is displayed on the display screen 41 of the function panel 40 connected to the control device C. Is displayed. Then, the target weft arrival timing TWm, the delay limit value TWLim, and the feedforward control amount Tmα are set using the target weft arrival timing setting unit 43a, the delay limit value setting unit 43b, and the feedforward control amount setting unit 43c on the setting screen 42. After that, the target weft arrival timing investigation switch 45a is turned on. Thereafter, the control device C performs a series of search steps according to the flowchart of FIG. Since an instruction to the worker is displayed on the comment display screen 44 of the setting screen 42 during the search process, the worker performs an operation displayed on the comment display screen 44 so that an appropriate target weft arrival timing TWm is obtained. Is set. In addition, the operator can confirm the progress on the progress confirmation screen 46.

  In addition, the operator displays the setting screen 50 on the display screen 41 of the function panel 40 when setting the optimum target weft arrival timing TWm when changing the delay limit value TWLim in consideration of the weft error. Then, the target weft arrival timing setting unit 43a, the delay limit value setting unit 43b, and the feedforward control amount setting unit 43c on the setting screen 50 are used to set the weft arrival timing TWm, the delay limit value TWLim, and the feedforward control amount Tmα. . The operator presses the target weft arrival timing investigation switch 45a on the setting screen 50 after inputting the values of the sampling amount and the reference weft error to the sampling amount display portion 51b and the reference weft error display portion 52 of the setting screen 50. Thereafter, the control device C performs a series of search steps according to the flowcharts of FIGS. 16 and 17. Since an instruction to the worker is displayed on the comment display screen 44 of the setting screen 50 during the search process, the worker performs an operation displayed on the comment display screen 44 so that an appropriate target weft arrival timing TWm is obtained. Is set.

  Then, when the air jet loom is operated for a predetermined time (for example, 2 hours) in a state where an appropriate target weft arrival timing TWm is set, a weft error amount and an instruction to the operator during that time are set on the setting screen 50. Is displayed. Moreover, if the progress confirmation screen 53 is displayed, the operator can confirm the operation status up to that point.

  Further, the operator confirms the progress confirmation screen 53 after the air jet loom has been operated for a predetermined time (for example, 2 hours), and sets the target weft arrival timing TWm in order to reduce the air consumption from the occurrence state of the weft error. It is possible to appropriately determine whether or not to change.

According to this embodiment, the following effects can be obtained.
(1) The weft insertion control method in the air jet loom includes a main nozzle 12 for weft insertion and a sub nozzle 14 for weft insertion, and weft Y is inserted by air injection from the main nozzle 12 and the sub nozzle 14. This is a weft insertion control method for an air jet loom. The state of the weft Y before being inserted by the weft state detection device 18 is detected, and the weft arrival timing TW predicted from the weft state detected by the weft state detection device 18 is later than the delay limit value TWLim. Performs feedforward control to increase the amount of air injection from the main nozzle 12 and the tandem nozzle 13, and delays the target weft arrival timing TWm within a range in which the weft arrival timing TW can be made earlier than the delay limit value TWlim by feedforward control.

  According to this configuration, the target weft arrival timing TWm can be delayed without increasing weft errors, and the compressed air pressure of the main nozzle 12 and the sub nozzle 14 can be lowered. Therefore, it is possible to reduce the consumption of the compressed air of the air jet loom without increasing the wetting error.

  (2) After performing weft insertion at the target weft arrival timing TWm for a preset time, check the rate (amount) of the weft error, and if the weft error rate is less than the preset rate, the delay limit value is set. Delay. When the ratio of weft errors is small, it is possible to further delay the target weft arrival timing TWm by delaying the delay limit value TWLim, and the consumption of compressed air in the air jet loom can be further reduced.

  (3) The control device C as a weft insertion control device includes a main nozzle 12 for weft insertion and a sub nozzle 14 for weft insertion, and the weft Y is inserted by air injection from the main nozzle 12 and the sub nozzle 14. When the weft arrival time TW predicted from the detected weft state is later than the delay limit value TWLim, the state of the weft Y before being inserted by the weft state detection device 18 is detected. Feed forward control for increasing the amount of air injection from the nozzle 13 is performed. Then, the control device C includes a target weft arrival timing setting unit 43a, a delay limit value setting unit 43b, a feed as a setting unit for setting the target weft arrival timing TWm, the delay limit value TWLim of the weft arrival timing, and the feedforward control amount Tmα. A forward control amount setting unit 43c is provided. Further, the control device C is based on the comparison between the latest latest weft arrival timing TWLat when weft insertion is performed under the setting conditions set by the setting units 43a to 43c and the delay limit value TWlim of the weft arrival timing TW. A feedforward control amount change control unit that changes the feedforward control amount Tmα, and a target weft arrival timing change that delays the target weft arrival timing TWm within a range in which the latest weft arrival timing TWLa can be made earlier than the delay limit value TWLim by feedforward control. A setting unit.

  Therefore, the target weft arrival timing TWm can be delayed without increasing the weft error, and the compressed air pressure of the main nozzle 12 and the sub nozzle 14 can be lowered. Therefore, it is possible to reduce the consumption of the compressed air of the air jet loom without increasing the wetting error.

  (4) The control device C includes setting screens 42 and 50 for displaying the setting result of the setting unit. According to this configuration, when the setting unit sets the target weft arrival timing TWm, the delay limit value TWlim of the weft arrival timing TW, and the feedforward control amount Tmα, whether or not each set setting value is set to a correct value. Can be confirmed on the setting screens 42 and 50.

  (5) The control device C may include progress confirmation screens 46 and 53 for displaying progress that has been inserted according to the conditions set by the setting unit and the changed conditions. According to this configuration, the operator can appropriately determine whether or not the consumption of the compressed air of the air jet loom can be reduced by checking the progress confirmation screens 46 and 53. Become.

  (6) The same screen on which the target weft arrival timing TWm, the delay limit value TWlim, the feedforward control amount Tmα, the measurement value, which is the set value set by the setting unit, and the weft error amount are displayed. The work instruction to the worker is displayed. Therefore, it is easy for the worker to confirm in which situation the work instruction is given.

The embodiment is not limited to the above, and may be embodied as follows, for example.
○ When the delay limit value TWLim of feedforward control is not changed in consideration of the weft error, or when the delay limit value TWlim is changed in consideration of the weft error, the initially set target weft arrival timing TWm, the delay limit The value TWLim and the value of the feedforward control amount Tmα are not limited to the values described in the above embodiment, and may be appropriately changed depending on the type of woven fabric and the weaving conditions.

  ○ When the delay limit value TWLim is changed in consideration of a weft error, the target weft arrival timing TWm, the delay limit value TWLim, and the feedforward control amount Tmα when the sampling is performed for 2 hours are performed in a state different from the above. As an example, the conditions of Table 1 can be mentioned.

制御装置Ｃは、表１のステップ１の条件、即ち、目標緯糸到達タイミングＴＷｍ＝２４０°、遅れ限界値ＴＷＬｉｍ＝２６０°、フィードフォワード制御量Ｔｍα＝０°で図１６及び図１７のフローチャートを実行する。ステップＳ４で最遅緯糸到達タイミングＴＷＬａｔ＝２６５°、よこミス量＝０．５本／ｈｒとなる場合を説明すると次のようになる。ステップＳ２〜ステップＳ４経てステップＳ５の判断でステップＳ６、ステップＳ１６、ステップＳ８、ステップＳ９を経てフィードフォワード制御量Ｔｍα＝１５°となり、ステップＳ２〜ステップＳ６、ステップＳ１６、ステップＳ８、ステップＳ９を経てフィードフォワード制御量Ｔｍα＝３０°となる。その状態で、ステップＳ２〜ステップＳ６、ステップＳ１６、ステップＳ１７を経て、目標緯糸到達タイミングＴＷｍ＝２４０°、遅れ限界値ＴＷＬｉｍ＝２６０°、フィードフォワード制御量Ｔｍα＝３０°でステップＳ１０２、ステップＳ１０３、ステップＳ１０４へ進み、ステップＳ１０４のサンプリング結果で、最遅緯糸到達タイミングＴＷＬａｔ＝２６５°、よこミス量＝０．５本／ｈｒとなる。そして、ステップＳ１０５からステップＳ１１２に進み、Ｅのコメントである「ＦＦ制御量１５°でＴＷｍを５°、ＴＷＬｉｍを５°遅らせて下さい。」を表示する。このＥのコメントは、前記実施形態の図１７におけるＥのコメント「ＴＷｍを５°早めて下さい。」とは異なる。そのため、ステップＳ１１３で目標緯糸到達タイミングＴＷｍと遅れ限界値ＴＷＬｉｍを共に５°遅らせる操作が行われる。

The control device C executes the flowcharts of FIGS. 16 and 17 under the conditions of Step 1 in Table 1, that is, the target weft arrival timing TWm = 240 °, the delay limit value TWLim = 260 °, and the feedforward control amount Tmα = 0 °. To do. The case where the latest weft arrival timing TWLat = 265 ° and the weft error amount = 0.5 / hr in step S4 will be described as follows. After step S2 to step S4, the feedforward control amount Tmα = 15 ° is obtained through step S6, step S16, step S8, and step S9 based on the determination in step S5. The feedforward control amount Tmα = 30 °. In this state, the target weft arrival timing TWm = 240 °, the delay limit value TWlim = 260 °, and the feedforward control amount Tmα = 30 ° through steps S2 to S6, step S16, and step S17, step S102, step S103, Proceeding to step S104, with the sampling result of step S104, the latest weft arrival timing TWLat = 265 ° and the weft error amount = 0.5 / hr. Then, the process proceeds from step S105 to step S112, and the comment of E, “Please delay TWm by 5 ° and TWLim by 5 ° when the FF control amount is 15 °,” is displayed. This E comment is different from the E comment “Please advance TWm by 5 °” in FIG. Therefore, in step S113, an operation of delaying both the target weft arrival timing TWm and the delay limit value TWlim by 5 ° is performed.

  Then, through Step S113, Step 2 in Table 1 is executed by the controller C with the target weft arrival timing TWm = 245 °, the feedforward control amount Tmα = 15 °, and the delay limit value TWLim = 265 °. After step S2 to step S4, the process proceeds to step S10 and step S11 based on the determination in step S5. After step S12, the target weft arrival timing TWm = 250 °, the delay limit value TWLim = 265 °, and the feedforward control amount Tmα = 30. Then, go to step S2. The process proceeds from step S3 to step S5, step S10, and step S17 to step S102 to step S104, and the amount of wetting errors = 0.5 / hr in the sampling result in step S104. Then, the process proceeds from step S105 to step S106 and step S107, and F comment “Please delay TWm by 5 ° and TWLim by 5 ° with the FF control amount unchanged” is displayed. This F comment is different from the F comment “Please delay TWLim by 5 °” in FIG.

  Then, after step S108, step 3 in Table 1 is executed by the controller C with the target weft arrival timing TWm = 250 °, the feedforward control amount Tmα = 15 °, and the delay limit value TWLim = 270 °. Proceeding from step S2 to step S4, the latest weft arrival timing TWLat = 270 ° is obtained as a result of the sampling in step S4. Then, the process proceeds to Steps S102 to S104 through Steps S10 and S17 based on the determination in Step S5. As a result of the sampling in Step S104, the latest weft arrival timing TWLat = 270 ° and the weft miss amount = 3 / hr. Then, the process proceeds to step S106, step S109, and step S110 according to the determination in step S105, and the comment “G is increased. Weak mistakes have increased. Set the FF control amount to 30 ° and advance TWLim by 5 °” is displayed. To do. This G comment is different from the G comment “TWLim search ends” in FIG.

  Then, Step 4 in Table 1 is executed by the controller C at the target weft arrival timing TWm = 250 °, the feedforward control amount Tmα = 30 °, and the delay limit value TWLim = 265 °. Proceeding from step S2 to step S4, the latest weft arrival timing TWLat = 265 ° is obtained as a result of the sampling in step S4. Then, in step S5, the process proceeds to step S17 through step S10, and the display of “comment end of TWm (FF control amount has reached the limit)” which is a C comment display is performed. In the air jet loom, weaving is performed at the target weft arrival timing TWm = 250 °, the feedforward control amount Tmα = 30 °, and the delay limit value TWlim = 265 °. While weaving was being performed, weft insertion data was sampled by the control device C, resulting in a weft error amount of 0.5 / hr.

  The values of the target weft arrival timing TWm, the delay limit value TWLim, and the feedforward control amount Tmα set by the target weft arrival timing setting unit 43a, the delay limit value setting unit 43b, and the feedforward control amount setting unit 43c are displayed on the function panel 40. The structure which is not displayed may be sufficient. For example, as the setting unit, the set values of the target weft arrival timing TWm, the delay limit value TWlim, and the feedforward control amount Tmα input by the numerical value input unit are respectively stored in the memory 36, and a set numerical value display unit is provided. There may be no configuration.

○ The value of the sampling amount is not limited to 1000 picks or 2 hours. For example, it may be changed according to fabric conditions (type of fabric) or weaving conditions.
○ The value of the standard weigh error is not limited to 2 / hr (hour).

  ○ The setting unit is not limited to a configuration in which an operator directly inputs a numerical value to be set. For example, numerical values of the target weft arrival timing TWm, the delay limit value TWLim, and the feedforward control amount Tmα are stored in the memory 36 of the control device C corresponding to various fabric conditions (fabric types) and weaving conditions. An appropriate target weft arrival timing TWm, delay limit value TWLim, and feedforward control amount Tmα may be set by the person setting the weaving condition and the weaving condition.

  The sampling amount and the set value of the reference weigh error are also stored in the memory 36 of the control device C corresponding to various fabric conditions (fabric types) and weaving conditions, and the operator can select the weaving conditions and weaving conditions. An appropriate setting value may be set by setting.

  ○ The target weft arrival timing TWm, delay limit value TWlim, feedforward control amount Tmα, sampling amount and reference weft error setting values are set in advance as standard values, and the operator can change them as necessary. Also good.

  In the flowchart for searching for the target weft arrival timing TWm, the change amount when changing the value of the target weft arrival timing TWm or the delay limit value TWLim based on the comparison between the latest weft arrival timing TWLat and the delay limit value TWLim Is not limited to an increase / decrease of 5 °, but may be a value larger than 5 ° or a value smaller than 5 °.

  ○ In the flowchart for searching for the target weft arrival timing TWm, the change amount when changing the value of the feedforward control amount Tmα is increased by 15 ° based on the comparison between the latest weft arrival timing TWLat and the delay limit value TWlim. The value is not limited to 15 °, and may be a value larger than 15 ° or a value smaller than 15 °.

  In the flowchart for searching for the target weft arrival timing TWm, when changing the target weft arrival timing TWm, the feedforward control amount Tmα, and the delay limit value TWlim, the control device C instructs the operator to change it on the screen. Instead of the operator confirming the screen and performing the instructed change work, the control device C may automatically make the change.

  ○ When setting the target weft arrival timing TWm in consideration of the weft error, after the completion of the “S1: TWm search routine”, when a work instruction is given to the worker after a predetermined time has been given, You may provide the notification lamp which alert | reports to. In this case, it becomes easy for the operator to quickly perform the necessary work.

  ○ The setting screens 42 and 50 may be omitted. However, if the setting screen is provided, the operator can check on the setting screens 42 and 50 whether or not each set value is set to a correct value.

  ○ The progress confirmation screens 46 and 53 may be omitted. However, when the progress confirmation screens 46 and 53 are provided, the operator can determine whether or not the consumption of compressed air of the air jet loom can be reduced by checking the progress confirmation screens 46 and 53. It becomes possible to do appropriately.

  The control device C is configured to have only the function of setting the target weft arrival timing TWm without considering the weft error without having the function of setting the target weft arrival timing TWm in consideration of the weft error. Also good.

  ○ The tandem nozzle 13 may be omitted.

  C: Control device as a weft insertion control device, Y ... Weft, 12 ... Main nozzle, 14 ... Sub nozzle, 18 ... Weft status detection device, 35 ... Feed forward control amount change control unit and target weft arrival timing change control unit CPU, 42, 50 ... setting screen, 43a ... target weft arrival timing setting unit as setting unit, 43b ... delay limit value setting unit as setting unit, 43c ... feedforward control amount setting unit as setting unit, 46, 53 … Progress confirmation screen.

Claims (5)

A weft insertion control method in an air jet loom comprising a main nozzle for weft insertion and a sub nozzle for weft insertion, wherein wefts are inserted by air injection from the main nozzle and the sub nozzle,
The state of the weft before being inserted by the weft state detection device is detected, and when the weft arrival timing predicted from the weft state detected by the weft state detection device is later than the delay limit value, A method for controlling weft insertion in an air jet loom, wherein feedforward control for increasing an air injection amount is performed, and the target weft arrival timing is delayed by a range in which the weft arrival timing can be made earlier than a delay limit value by the feedforward control.   The weft insertion is performed at the target weft arrival timing for a preset time, and then a weft error rate is confirmed. If the weft error rate is less than a preset rate, the delay limit value is delayed. Control method for air jet looms. A main nozzle for weft insertion and a sub nozzle for weft insertion are provided, and wefts are inserted by air injection from the main nozzle and the sub nozzle, and the state of the wefts before being inserted by the weft state detection device is detected. A weft insertion control device for an air jet loom that performs feedforward control to increase the amount of air injection from the main nozzle when the weft arrival timing predicted from the detected weft condition is later than the delay limit value. ,
A setting unit for setting a target weft arrival timing, a delay limit value of the weft arrival timing, and a feedforward control amount;
A feedforward control amount change control unit that changes the feedforward control amount based on a comparison between the latest slowest weft arrival timing when weft insertion is performed under the setting conditions set by the setting unit and the delay limit value When,
A weft insertion control in an air jet loom, comprising: a target weft arrival timing change control unit that delays a target weft arrival timing within a range in which the latest weft arrival timing can be made earlier than the delay limit value by the feedforward control. apparatus.   The weft insertion control device for an air jet loom according to claim 3, further comprising a setting screen for displaying a setting result of the setting unit.   5. The weft insertion control device for an air jet loom according to claim 3, further comprising a progress confirmation screen that displays the progress of weft insertion according to the conditions set by the setting unit and the changed condition.

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