JPH10310952A - Control of jet from sub-nozzle and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an air consumption from sub-nozzles in an air jet-type loom by stabilizing weft carrying with sub-nozzles in an overrunning state of weft insertion in stating of the loom and just after changing of a yarn feeding body, etc., and preventing generation of inferiority of the weft insertion. SOLUTION: A normal weft carrying is performed by setting a standard jetting period of sub-nozzles 14a, 14b, 14c and 14d, and putting forward a jet starting timing of the sub-nozzles 14a, 14b, 14c and 14d when an overrunning state of the weft insertion is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an air jet loom,
The present invention relates to a method and an apparatus for controlling an injection period of a sub-nozzle.

[0002]

2. Description of the Related Art In an air jet loom, weft insertion is performed by:
This is performed by injecting air from the main nozzle together with the weft yarn and flying the weft yarn into the warp yarn opening.
At this time, the sub-nozzles of the plurality of groups assist the flying state of the weft yarn by relay-injecting air in the weft insertion direction toward the leading end portion of the weft yarn in the flying state.

[0003] By the way, in a weft insertion, particularly in a transient state of the weft flight, for example, at the time of starting the loom or immediately after the switching of the yarn feeder, the arrival position of the weft flight with respect to a fixed rotation angle of the main shaft of the loom is determined by the weft flight. It precedes the position in the standard condition of running. Depending on the increase in the load at the time of starting the loom or the type of yarn, the leading amount becomes large, and the weft yarn is not normally conveyed by the sub-nozzle, resulting in poor weft insertion. On the other hand, it is conceivable to give a margin to the set injection period of the sub-nozzle. However, setting an extra injection period temporarily, for example, for a transient state of about 1% of the entire weaving period, reduces air consumption. It will increase uselessly.

[0004]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an air-jet loom in which a weft injected from a main nozzle is conveyed by a plurality of sub-nozzles arranged along a flight path of the weft to perform weft insertion. An object of the present invention is to stabilize the weft yarn conveyance by the sub-nozzle in a weft-transition transient state, such as at startup or immediately after switching of the yarn feeder, thereby preventing poor weft insertion and reducing air consumption by the sub-nozzle.

[0005]

To achieve the above object, the present invention provides a method for controlling the injection of a sub-nozzle according to the first aspect of the present invention, wherein the standard state of weft flight, in other words, the state of steady weft insertion. The standard injection period of the sub-nozzle is set for the weft yarn transport in the above, and when the transient state of weft insertion is detected, the injection start timing of the sub-nozzle is advanced.

[0006] Here, the transient state of weft insertion is (1)
When the loom is started, it refers to a period from the rise of the start signal until the loom reaches the steady operation speed, or (2) a fixed period after the yarn feeder is switched. Further, the injection start timing means to advance the injection start timing by a predetermined period on the time or on the rotation angle of the main shaft.

According to a second aspect of the present invention, there is provided a detector for detecting a transient state of weft flight and a detection signal input from the detector according to the second aspect of the present invention. A switch which switches the standard injection start timing to the backup injection start timing and outputs the same, and compares the injection start timing output from this switch with the rotation angle of the main shaft of the loom, and starts the injection when the two coincide. A comparator for an injection start command that outputs a timing command, a setter for an injection end timing, and a comparison between the injection end timing output from the setter and the rotation angle of the main shaft of the loom, and when these coincide with each other, An injection end command comparator for outputting an end timing command; an injection start timing command from the injection start command comparator; A driving unit that drives an electromagnetic valve for supplying compressed air to the sub-nozzle over the injection period from the injection start timing to the injection end timing, with the command of the injection end timing from the command comparator as an input, Of the injection control device.

When the weft yarn is injected from the main nozzle and inserted into the opening of the warp yarn, the injection starts from the sub-nozzle close to the main nozzle in the state of the relay injection, so that the weft yarn is attached to the jet air from the sub-nozzle. Forced to fly along the flight path and be inserted. During the operation of the loom, when a transient state of the weft insertion is detected by the detector, the switcher switches to the backup injection start timing in order to advance the injection start timing of the sub-nozzle. For this reason, the sub nozzle normally transports the weft yarn according to the changed ejection period.

[0009]

FIG. 1 shows an outline of a weft insertion device 1 of an air jet loom. The weft yarn 2 is supplied from a plurality of, for example, two yarn-tied yarn supplying bodies 3, measured by the length measuring and storing device 4 for a length necessary for weft insertion of one pick, and stored until the start of the weft insertion. The length measuring / storing device 4 is, for example, a drum type. The rotating yarn guide 5 is rotated along the outer periphery of the drum 6 by a motor 8, and the weft yarn 2 is locked on the outer circumferential surface of the drum 6 by a locking pin 7. While wrapping the length necessary for inserting at least one pick, for example, only 4 rolls, measure the length,
And store.

At the start of the weft insertion, the retaining pin 7 is moved in the retreating direction by the operation device 9 at the unwinding timing, so that the stored weft yarn 2 is formed on the outer peripheral surface of the drum 6.
To unwind. At the same time, the main nozzle 13 as a weft insertion nozzle draws in the unwound weft yarn 2,
Opening 16 of warp 15 with pressurized air
Insert with blast air inside.

The unwinding controller 10 includes a main shaft 11 of a loom.
The signal of the rotation angle θ from the rotation detector 12, the signal of the deviation of the weft arrival time Δθe from the control device 22, the signal of the standard unwinding timing θs0, and the signal of the standard locking timing θe0 from the control device 22 are input. The forward / backward movement of the locking pin 7 is controlled by signals of the timing θs and the locking timing θe.

A state in which the weft yarn 2 is unwound from the drum 6 and the number of unwound yarns are detected by an unwinding sensor 19. The unwinding sensor 19 is configured by, for example, a combination of a pair of a light emitter and a light receiver, detects an unwound state and the number of unwound windings by blocking light by the unwound weft yarn 2, and unwinds one turn. Each time, two pulse-like unwinding signals S1 are generated and sent to the control devices 21c and 21d. In addition,
The switching state of the two yarn feeders 3 is detected by the thread switching sensor 20 as a thread switching signal S2.

By the injection of the compressed air, the weft yarn 2 rides on the jet air flow and travels along the flight path inside the opening 16. In this flight route, a plurality of, for example, four groups a, b,
c, d sub-nozzles 14a, 14b, 14c, 14d
Are arranged along the flight direction of the weft yarn 2, and FIG.
As shown in FIG. 3, depending on the flying position of the leading end of the weft yarn 2, the compressed air is supplied to, for example, the standard injection periods Ta0, Tb0,
By performing the relay injection sequentially over Tc0 and Td0, the weft 2 is assisted to fly.

The arrival sensor 17 is a feeler for detecting whether the weft is inserted or not. The arrival sensor 17 generates an arrival signal Se by detecting the leading end of the weft yarn 2 on the non-weft insertion side.
Send to control device 22.

The state of the flight speed of the weft yarn 2 is detected by an arrival sensor 18 provided in the opening 16 of the warp yarn 2 in the middle of the flight path, for example, between the sub-nozzle 14a of the group a and the sub-nozzle 14b of the group b. can do.
The arrival sensor 18 detects the leading end of the flying weft thread 2 to generate a weft thread 2 arrival signal Sb and sends it to the control devices 21c and 21d corresponding to the groups c and d.

Since the time from when the weft yarn 2 is unwound to when the weft yarn 2 reaches the installation position of the arrival sensor 18 is proportional to the unwound length of the weft yarn 2 (the number of unwound windings), The arrival time of the weft yarn 2 at the installation position of the sensor 18 can also be detected by the unwinding sensor 19 on the side of the length measuring and storing device 4 as an unwinding signal S1. In this example,
The control devices 21c and 21d of the groups c and d use the unwind signal S1 instead of using the arrival signal Sb.

The pressurized air for weft insertion is supplied from a pressurized air source 23 through a supply path 24 to a pressure regulator 2 serving also as a tank.
5, via the solenoid valve 27 to the main nozzle 13, the supply path 24, the pressure regulator 26 also serving as a tank, the solenoid valves 28a,
8b, 28c, 28d, and then each group a, b, c, d
Are supplied to the sub nozzles 14a, 14b, 14c, and 14d, respectively.

Here, the control device 22 controls the movement of the locking pin 7 and the injection of the main nozzle 13 by controlling the rotation angle θ from the rotation detector 12 and the arrival signal Se from the arrival sensor 17. , The signal of the deviation Δθe is generated to the unwinding controller 10 and the opening and closing of the solenoid valve 27 is controlled to adjust the injection period (injection start timing, injection end timing) of the main nozzle 13. .

In order to control the sub-nozzles 14a and 14b of the groups a and b, the control devices 21a and 21b receive signals of the rotation angle θ from the rotation detector 12 and open and close the solenoid valves 28a and 28b. , The normal injection periods Ta0 and Tb0 (injection start timings θa0 and θa0) of the sub nozzles 14a and 14b
b0, the injection end timing θa1, Tb1) is controlled.

Further, the control devices 21c and 21d control the sub-nozzles 14c and 14d of the groups c and d, respectively, by controlling the rotation angle θ from the rotation detector 12 and the unwinding signal S1 from the unwinding sensor 19. Is controlled to control the opening and closing of the solenoid valves 28c and 28d, so that the normal injection period Tc of the sub-nozzles 14c and 14d is
0, Td0 (injection start timings θc0, θd0, injection end timings θc1, θd1) are set, but are changed as necessary.

In this embodiment, the control device 20 for the main nozzle 13 detects the arrival time of the leading end of the weft yarn 2 by the arrival sensor 17 on the non-weft insertion side, if necessary, and outputs the arrival signal. Depending on the advance or delay of Se,
By changing the release timing of the locking by the locking pin 7 and the injection period (injection start timing) of the main nozzle 13, the arrival timing of the weft yarn 2 always becomes the standard arrival timing at the weft end on the anti-weft insertion side. Control.

Next, FIG. 2 shows, as an example, the configuration of the control device 21c of the sub-nozzle 14c corresponding to the group c. The configuration of the control device 21d is basically the same as the control device 21c.

The controller 21c includes a detector 31 in a weft insertion transient state, a detector 32 in a weft flight speed state,
A setting unit 35 for setting the backup injection start timing θc2 during the weft insertion transient state, a setting unit 36 for setting the standard injection start timing θc0, and a backup injection during the weft flight delay state. A setting device 37 for setting the end timing θc3, a setting device 38 for setting the standard injection end timing θc1, and a switching device for switching among the setting devices 35 and 36 and the setting devices 37 and 38 according to the outputs from the respective detectors 31 and 32. 33, an injection start command comparator 3 that outputs a command of the switched injection start timing θc0 or injection start timing θc2 in response to the rotation angle θ signal from the rotation detector 12.
9, an injection end command comparator 40 for outputting commands of the injection end timings θc1 and θc3 switched by the switch 34 in accordance with the rotation angle θ, these comparators 39,
The flip-flop 42 for setting the injection periods Tc0, Tc1, Tc2 according to the command of the injection start timings θc0, θc2, the injection end timing θc1, or the injection end timing θc3 from 40 and the solenoid valve 28c is driven according to the output thereof. Driving unit 41 including driving amplifier 43
It is constituted by.

The control devices 21a and 21b corresponding to the other groups a and b are also provided by the control devices 21c and 21b.
Although the configuration is almost the same as that of d, since the backup control of the end of the injection is not performed, components corresponding to the detector 32, the setting device 37, and the switching device 34 are not provided.

FIG. 3 shows a detector 31 in a weft insertion transient state.
An example is shown. Transient detector 31
Is an example in which a restart signal S or a thread change signal S2 is input and thereby a transition state of the weft insertion is detected, and two signal generators 44 and 45 receiving these signals as input for a certain period of time and their outputs OR gate 4 inputting
6 and a setter 47 for the fixed period of the fixed period signal generator 44.

Next, FIG. 4 shows an example of the detector 32 in the state of the weft running speed. Detector 32 of this embodiment
Compares the reference rotation angle θo given by the setting unit 48 with the signal of the rotation angle θ from the rotation detector 12 to determine whether the switching of the injection end timing θc1 is necessary or unnecessary. The comparator 49, which generates an output when the rotation angle becomes equal to the reference rotation angle θo, the unwinding sensor 19
The counter 51 generates an output when the number of pulses of the unwinding signal S1 from the counter 51 reaches the number of pulses set by the pulse number setting unit 52, and the time when the output of the counter 51 is generated and the output of the comparator 49 are output. When the output time from the counter 51 is later than the output time from the comparator 49, it is determined that the state of the flight speed of the weft yarn 2 in the weft insertion cycle at this time is delayed. The switching unit 34 generates a switching command, and sends the switching command to the switching unit 34.

FIG. 5 shows that the running position of the weft yarn 2 is made to correspond to the positions of the sub-nozzles 14a, 14b, 14c, 14d of the groups a, b, c, d on the rotation angle θ of the main shaft 11,
The flight characteristics of the weft yarn 2 are shown as straight lines for convenience. In the steady insertion, the sub-nozzle 14a performs the injection over the standard injection period Ta0 (injection start timing θa0, injection end timing θa1), and the sub-nozzle 14b performs the injection period Tb0 (injection start timing θb).
0, the injection is performed over the injection end timing θb1).
Further, the sub-nozzle 14c performs the injection operation over the injection period Tc0 (injection start timing θc0, injection end timing θc1), and the sub-nozzle 14d performs the injection over the injection period Td0 (injection start timing θd0, injection end timing θd1). By
The weft yarn 2 in flight is jetting air in the weft insertion direction.

However, when the state of the traveling speed of the weft yarn 2 during the weft insertion is detected as a delayed state, in the same weft insertion cycle, the control devices 21c, 21d
The sub-nozzles 14c, 14d controlled by changing the injection end timings θc1, θd1 to backup injection end timings θc3, θd3 respectively add the injection periods Tc1, Td1 after the respective injection periods Tc0, Td0. This extends the duration of these injections as a whole in the delay direction.

Further, when the weft insertion is in a transition state, the inclination of the weft flight straight line changes in a direction larger than the standard time. That is, at the rotation angle θ of the main shaft 11, the weft 2
Is relatively faster. Along with this, the control devices 21a, 21b, 21c, 21d set the early injection start timings θa2, θb2, θc2, θd2, thereby setting the standard injection periods Ta0, Tb0, Td.
Before c0, Td0, the injection periods Ta2, Tb2, Tc2,
Td2 is added. In this way, the control devices 21a, 21b, 21c, 21d
Are the standard injection periods Ta0, Tb0, Tc0, Td0.
On the other hand, the backup injection period Tc
By adding 1, Td1, and adding a backup injection period Ta2, Tb2, Tc2, Td2 before that, the sub-nozzles 14a, 14b, 14c, 14d are adjusted to the respective weft flight straight lines. Set the injection period.

The above operation will be described with respect to the control device 21c. When the weft insertion is not in the transient state, the switch 33
Sends the signal of the injection start timing θc0 at the standard time to the comparator 39. Therefore, the comparator 39 outputs the command of the injection start timing θc0 when the injection start timing θc0 matches the rotation angle θ, and sets the flip-flop 42 inside the drive unit 41 to the set state.
From that point, the solenoid valve 28c is opened.

On the other hand, when the state of the weft running speed during the weft insertion is detected by the detector 32, and as a result, it is determined that the state is the standard weft running speed,
The switch 34 outputs the injection end timing θc1 at the standard time to the comparator 40. Therefore, the comparator 40
Resets the flip-flop 42 when the rotation angle θ reaches the angle value corresponding to the injection end timing θc1. At this time, the drive unit 41 closes the electromagnetic valve 28c and ends the injection of air from the sub nozzle 14c.
As a result, the sub-nozzle 14c sets the standard injection period Tc0.
Inject about.

During the horizontal insertion operation, the comparator 49 outputs an output at the reference rotation angle θo, and the counter 51 outputs
The number of pulses of the unwinding signal S1 from the unwinding sensor 19 is counted, and when the number reaches the value set by the setting unit 52, a count-up output is generated and sent to the comparator 50. When the count-up time of the counter 51 is later than the time when the output of the comparator 49 is generated, that is, when the flight speed of the weft yarn 2 is lower than the standard during the weft insertion, the comparator 50 In the horizontal insertion cycle, a switching command is generated, and the switch 34 is switched.

Therefore, the switch 34 outputs the backup injection end timing θc3 to the comparator 40 instead of the standard injection end timing θc1. Therefore, the comparator 40 operates the drive unit 41 with the injection end timing θc1 as the backup injection end timing θc3 in the horizontal insertion cycle to be controlled. Similarly, the control device 21d also controls the standard injection period Td0.
, A backup injection period Td1 is added to the weft 2
Corresponding to the flight speed delay. As a result, the sub-nozzles 14c and 14d of the two groups c and d have the backup injection periods Tc1 and Td0 added to the standard injection periods Tc0 and Td0.
Td1 is added.

When the weft insertion is in a transitional state, for example, when the loom is started, or immediately after the yarn feeder 3 is switched, the detector 31 in the weft insertion transient state is
By outputting the transient state command, the switching device 3
3 and the backup injection start timing θc2 is sent to the comparator 39 instead of the standard injection start timing θc0. For this reason, the comparator 39 starts the injection of the sub nozzles 14c of each group c at the injection start timing θc2 earlier than the standard injection start timing θc0. In the transient state, the backup control of the injection start is performed for all the sub nozzles 14a, 14b, 14
c and 14d.

The arrival timing control (feedback control) for changing the weft insertion start timing may be used together. For example, the injection start timing of the main nozzle 13 and / or the weft unwinding timing by the locking pin 7 may be changed in a direction to eliminate the deviation between the arrival timing and the reference arrival timing.

In setting the unwinding pulse by the setting unit 52, the following is considered. In the early stage,
Since the variation is small, there is a possibility that the judgment is wrong. On the other hand, if it is too late, the effect of delaying the injection end timing will not be sufficiently reflected on the sub-nozzle 14c on the yarn supply side, and there is a possibility that poor weft insertion may occur. In consideration of the above, it is desirable that the number of pulses indicating that the number of turns corresponding to half of one pick has been unwound is set in the setting unit 52. Since the unwinding sensor 19 of the embodiment outputs two pulses each time one turn of the weft is unwound,
If four picks are used, a total of eight pulses will be output. Therefore, 4 is set in the setting unit 52. It is determined by repeating the trial weaving while appropriately changing the standard value so that the air consumption is minimized.

FIG. 6 shows an experimental example of the correlation between the unwinding signal S1 (output timing of the fourth pulse) and the arrival timing (arrival angle) of the weft at that time. It can be understood from FIG. 6 that in each weft insertion, the arrival timing of the weft yarn 2 is not always the same even if the output time point of the unwind signal S1 is the same. FIGS. 7, 8, and 9 show examples in which the distribution region in FIG. 6 is represented by an ellipse, and the reference timing (reference rotation angle θo) and the sub-nozzle off timing (injection end timing at the standard time) are set. ing.

First, FIG. 7 shows the reference timing θo and the off-timing θc1 of the sub-nozzles of the groups c and d.
It shows a state in which θd1 is set to an optimum value. That is, a state is shown in which the off-timings θc1 and θd1 of the sub-nozzles of the groups c and d are set such that the weft yarn with the latest arrival timing when the unwinding timing coincides with the reference timing θo can be normally conveyed. The hatched portion indicates an area where the sub nozzles of the groups c and d set at the off timings θc1 and θd1 cannot normally carry the weft yarn. When the output timing of the fourth pulse is output after the reference timing θo, the off timing is switched to θc3 and θd3, but the ratio of the hatched portion to the elliptical portion on the right side of the reference timing θo in FIG. 7 is relatively large. Therefore, the air-saving effect by the sub-nozzle off timing control can be expected considerably.

Next, FIG. 8 shows an example of a bad setting.
The sub-nozzle off timings θc1 and θd1 are examples in which the weft yarn with the latest arrival timing when the unwinding timing matches the reference timing is not covered. In this case, if the unwinding timing is earlier than the reference timing (the hatched portion in FIG. 8), the sub-nozzle off-timing is not extended, and the fuel is not injected at the sub-nozzle correction off-timing.
Stops due to horizontal insertion increase.

FIG. 9 shows an example in which the air saving effect is small. Here, a case is shown in which the reference timing is set too large. Also at this time, when the unwinding timing coincides with the reference timing θo, the sub-nozzle off-timings θc1 and θd are set to such an extent that normal weft conveyance can be performed for the latest weft insertion at the arrival timing.
1 is set. However, the value is larger than the value in the case shown in FIG. 7, so that more air is consumed. Further, the reference timing θ in FIG.
Since the ratio of the hatched portion to the elliptical portion on the right side of o is small, the air saving effect by the sub-nozzle off timing control cannot be expected from this point as well.

The reference value is obtained by replacing the rotation angle θ of the main shaft 11 with:
The timing may be after a predetermined delay time from a timing signal indicating the start of weft insertion, such as the timing of unlocking by the locking pin 7. Such a method of determining the reference value is particularly effective when used together with the control for changing the start time of the weft insertion to make the arrival timing constant. The control method of the present invention may be applied to arrival timing control in which the pressure on the main nozzle 13 is changed in the next and subsequent weft insertion cycles in order to set the detected weft arrival timing as a target value. As shown in FIGS. 10 and 11, the backup off period may be set by a delay time. In this case, delay circuits 53 and 54 are interposed between the comparators 39 and 40 and the switches 33 and 34, and their delay times are independently set by delay time setting units 55 and 56, respectively. It has become. The switches 33 and 34 switch the outputs of the comparators 39 and 40 or delayed outputs of the outputs according to the outputs of the detectors 31 and 32 and output the outputs to the comparators 39 and 40.

In the case of multi-color weft insertion, a standard injection end timing θc1 and a backup injection end timing θc3 are set for each yarn type, and as shown in FIG. The corresponding injection end timing may be output. The same applies to the injection start timing.

When the flight of the weft yarn 2 is in a transitional state, particularly when the yarn feeder 3 is switched, not only the injection start timing but also the injection end timing may be delayed. Depending on the yarn type, the weft flight speed may be slow, but this can be coped with.

Time periods Tc1 and Td1 for delaying the end of injection
May be a value common to a plurality of target sub-nozzle groups.

In the above-described embodiment, the injection periods Tc0, Tc0,
The backup control for terminating the injection that delays d0 is performed, but the injection period (Tc0 + Tc1), (Td0 + Td1)
Is set as the standard injection period, control for delaying the injection period can be omitted. At this time, the weft running speed detector 32, the backup setting device 37, and the switching device 34 in FIG. 2 are omitted, and the standard injection end timing θc1 by the standard setting device 38 is changed to the injection end timing θc3. Set as Thus, the injection period at the standard time is equal to the injection period (Tc0 + Tc).
1), (Td0 + Td1).

The present invention can also be carried out with the following modifications. (1) When the weft insertion is in a transition state, particularly when the yarn supplying body 3 is switched, not only the injection start timing may be advanced but also the injection end timing may be delayed. Because, depending on the thread type,
This is because the state of the weft flight speed may be reduced. (2) The injection period for setting the injection period earlier is as follows:
It can also be set as a common value for a plurality of sub-nozzle groups. Further, in each of the above embodiments, both the time when the yarn supplying body 3 is switched and the time when the loom is started up are targeted, but the injection start timing is advanced or the injection start timing is targeted for at least one of them. The injection end timing may be delayed while being advanced.

[0047]

According to the present invention, it is possible to stably convey the weft yarn even in the weft insertion transient state without unnecessarily lengthening the injection period.

[Brief description of the drawings]

FIG. 1 is a block diagram of a weft insertion device.

FIG. 2 is a block diagram of a control device for a sub-nozzle.

FIG. 3 is a block diagram of a transient state detector.

FIG. 4 is a block diagram of a detector in a state of a weft flight speed.

FIG. 5 is a graph of a weft flight straight line.

FIG. 6 is an explanatory diagram of unwinding timing and arrival timing.

FIG. 7 is an explanatory diagram of unwinding timing and arrival timing.

FIG. 8 is an explanatory diagram of unwinding timing and arrival timing.

FIG. 9 is an explanatory diagram of unwinding timing and arrival timing.

FIG. 10 is a block diagram of another embodiment.

FIG. 11 is a block diagram of another embodiment.

FIG. 12 is a block diagram of another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weft insertion device 10 Unwinding controller 11 Main shaft 12 Rotation detector 13 Main nozzle 14a, 14b, 14c, 14d Sub nozzle 17 Reaching sensor 18 Reaching sensor 19 Unwinding sensor 20 Thread change sensor 21a, 21b, 21c, 21d Control device Reference Signs List 22 Control device 27 Solenoid valve 28a, 28b, 28c, 28d Solenoid valve 31 Detector of weft insertion transient state 32 Detector of weft flight speed state 33 Switching unit 34 Switching unit 35 Setting unit 36 Setting unit 37 Setting unit 38 Setter 39 Comparator for injection start command 40 Comparator for injection end command 41 Drive unit

Claims (2)

[Claims] 1. A standard injection period of a sub-nozzle is set for a weft yarn transport in a weft insertion steady state, and the injection start timing of the sub nozzle is advanced when a weft insertion transient state is detected. Injection control method for the sub nozzle. 2. A detector for detecting a transient state of horizontal insertion, a switch for switching a standard injection start timing to a backup injection start timing when a detection signal is input from the detector, and outputting the same. A comparator for an injection start command that compares the injection start timing output from the switch and the rotation angle of the main shaft of the loom, and outputs a command for the injection start timing when the two coincide with each other; A comparison is made between the injection end timing output from the setting device and the rotation angle of the main shaft of the loom, and a comparator for the injection end instruction that outputs a command for the injection end timing when they match, and a comparison for the injection start instruction. The injection start timing command from the injector and the injection end timing command from the injection end command comparator are input and the injection start timing is A control unit for driving a solenoid valve for supplying compressed air to the sub-nozzle over an injection period up to the firing end timing.