JP2003213545A - Air-injection unit in loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-injection unit in a loom, capable of automatically adjusting exhaust-staring timing according to changed quantity in air-injection timing or open-close timing, while the air-injection unit is so structured that residual air remaining in air supply pipelines is exhausted after completion of air injection from nozzles. <P>SOLUTION: In this air-injection unit 1 (picking motion of the air jet loom), electromagnetic on-off valves 13, 23 and electromagnetic exhaust valves 14, 24 are each mounted on the air supply pipelines 12, 22 for connecting a pressurized air source 11 and the nozzles (a main nozzle 10 or sub-nozzles 18), the open-close timing (open timing Bs and close timing Be) for the electromagnetic on-off valves 13, 23 and exhaust timing (the exhaust-starting timing Cs and exhaust-ending timing Ce) for the electromagnetic exhaust valves 14, 24 are independently set, and the exhaust timing (the exhaust-starting timing Cs and the exhaust-ending timing Ce) of the electromagnetic exhaust valves 14, 24 is adjusted according the changed quantity in the open-close timing when the open-close timing (the open timing Bs and the close timing Be) of the electromagnetic on-off valves 13, 23 is changed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to means for controlling the injection of pressurized air to a nozzle that applies a force to a weft by air injection in a loom.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 59-76949 discloses a weft inserting device for an air jet loom. In order to prevent damage to the warp due to the residual air flow from the sub-nozzle when the warp is closed, the weft inserting device blocks or communicates with the compressed air supply conduit connecting the air tank and the sub-nozzle. The first switching valve and the second switching valve (three-way valve) that opens the compressed air supply pipeline between the first switching valve and the sub nozzle to the atmosphere when the first switching valve is shut off.

Further, in the above-mentioned Japanese Patent Laid-Open No. 59-76949, the first switching valve and the second switching valve are composed of an on-off valve and a three-way valve, or one three-way valve. It is shown. These valves exhaust the pressurized air in the compressed air supply conduit by connecting the compressed air supply conduit communicating with the sub nozzle to the atmosphere discharge side when the injection of the sub nozzle is completed.

[0004]

In recent years, electromagnetic valves have been used as control valves for weft insertion nozzles such as sub-nozzles and main nozzles because ease of setting injection timing is required. Therefore, the latter technique in the above-mentioned Japanese Patent Laid-Open No. 59-76949, that is, the first switching valve and the second switching valve are constituted by one three-way valve, and the injection / pressure supply line of the weft insertion nozzle is provided. In the case of exhaust control of No. 3, it takes time due to a response delay until the flow path of the three-way valve is completely switched. As a result, residual pressure exhaust becomes insufficient, which is not practical.

Further, the former technique disclosed in the above-mentioned Japanese Patent Laid-Open No. 59-76949, that is, the first switching valve and the second switching valve are composed of an on-off valve and a three-way valve, or an on-off valve and a three-way valve. When it is configured by combining with a valve, the weft inserting condition and the injection timing of the weft inserting nozzle are originally adjusted in accordance with the operating condition of the loom,
Exhaust valve (three-way valve) must be used if injection timing is changed
Exhaust timing should be changed accordingly, but it does not immediately affect the operation of the loom, so it is easy to forget to adjust exhaust timing and leave the adjustment omission for a long time. High risk.
Therefore, there is a problem that the warp yarns are damaged by the residual pressure fumes for a long period of time, and the quality of the fabric is significantly deteriorated.

In any case, when the injection end timing of the weft insertion nozzle is changed, it is desirable to have a device which always exhausts rapidly immediately after the changed injection end timing.
Such a problem exists not only in the weft-inserting nozzle but also in a device such as a weft tension applying device or a tuck-in device that causes a jet flow from the nozzle to act on the weft. Therefore, an object of the present invention is to provide an air injection device that exhausts residual air in an air supply pipe after the injection of a nozzle is completed, and the operation timings of the electromagnetic opening / closing valve and the electromagnetic exhaust valve are independent of the injection timing of the nozzle. Then, the exhaust start timing can be corrected according to the change amount of the injection end timing.

[0007]

In view of the above object, the present invention relates to an air injection device of a loom, an electromagnetic opening / closing valve and an electromagnetic exhaust valve in an air supply pipe line connecting a pressure air source and a nozzle. In addition, the timings of the electromagnetic on-off valve and the electromagnetic exhaust valve can be set independently, and when the nozzle injection timing or the electromagnetic on-off valve opening / closing timing is changed, the electromagnetic The exhaust start timing of the exhaust valve is automatically corrected. Here, the nozzles to be controlled are mainly weft insertion nozzles, that is, main nozzles, sub-nozzles, or main nozzles and sub-nozzles, but are not limited thereto.
It may be a nozzle of a device that causes the jet flow from the nozzle to act on the weft, such as a weft tension applying device or a tuck-in device.

More specifically, the air injection device for a loom according to a first aspect of the present invention is an electromagnetic opening / closing valve provided in an air supply pipe line connecting a pressure air source and a nozzle, the electromagnetic opening / closing valve, and the electromagnetic opening / closing valve. An electromagnetic exhaust valve that is provided between the nozzle and opens the air supply conduit communicating with the nozzle to the atmosphere, a setting device that sets the timing for operating the electromagnetic opening / closing valve and the electromagnetic exhaust valve, and rotation of the loom It has a controller that outputs an operation command to the electromagnetic on-off valve and the electromagnetic exhaust valve based on an angle and the timing from the setter.As a characteristic matter, the setter includes the electromagnetic on-off valve. And a timing setter capable of independently setting each timing of the electromagnetic exhaust valve, and a correction means for correcting the exhaust start timing of the electromagnetic exhaust valve in accordance with the change amount of the closing timing of the electromagnetic opening / closing valve. A.

In the above air injection device for a loom, when the injection end timing of the nozzle is changed, the correction means corrects the exhaust start timing of the electromagnetic exhaust valve based on the change amount of the closing timing of the electromagnetic opening / closing valve. .

In the air injection device for a loom according to a second aspect of the present invention, the correction means is configured to control the electromagnetic force based on the difference between the arrival timing at which the tip of the weft reaches a predetermined position on the flight path of the weft and the arrival timing of the target. Correct the exhaust start timing of the exhaust valve.

In the air injection device for a loom according to a third aspect of the present invention, the setting device is set with timings for operating the electromagnetic on-off valve and the electromagnetic exhaust valve corresponding to a selected weft yarn type, respectively. With the change of the closing timing of the electromagnetic opening / closing valve, the correction means corrects the exhaust start timing of the electromagnetic exhaust valve corresponding to the selected yarn type.

[0012]

FIG. 1 shows an air injection device 1 for a loom according to the present invention. In this embodiment, the air injection device 1 of the loom is a weft insertion device of the air jet loom. In FIG. 1, the weft yarn 4 pulled out from the yarn feeder 3 supported by the holder 2 is guided to, for example, the rotary yarn guide 6 of the drum type length measurement storage device 5, and the outer peripheral surface of the drum 7 in a stationary state. While being locked by the locking pin 8, the length is measured by being wound around the drum 7 by the rotational movement of the rotary yarn guide 6, and is stored until weft insertion.

For the weft inserting operation, when the locking pin 8 is driven by the operating device 9 at the time of weft insertion and retracts from the outer peripheral surface of the drum 7, the weft yarn 4 wound around the outer peripheral surface of the drum 7 becomes The drum is unwound on the drum 7 by the length required for one weft insertion, and is guided to the main nozzle 10 as a weft insertion nozzle.

The main nozzle 10 injects the pressurized air 15 into the opening 17 of the warp 16 at the injection timing of the injection period A, that is, from the injection start timing As to the injection end timing Ae for the weft insertion operation. By doing so, the weft 4 having the length necessary for one weft insertion is opened 1
Weft insert into 7. As a result, the weft yarn 4 flies along the flight path in the opening 17. The pressure air 15 is
Pressure air source 11 to pressure regulator 19, air supply line 1
2. The air is supplied through the electromagnetic opening / closing valve 13 and the electromagnetic exhaust valve 14 in the air supply conduit 12. The pressure adjuster 19 sets the supply pressure of the pressurized air 15 to the main nozzle 10 to a predetermined pressure value.

For this injection operation at the time of weft insertion, the electromagnetic on-off valve 13 is constituted by, for example, a spring return type electromagnetically driven two-port on-off valve as shown in (1) of FIG. It is provided in the air supply conduit 12 that connects the air source 11 and the main nozzle 10, and in conjunction with the weft insertion operation, the opening / closing timing of the open period B corresponding to the injection period A, that is, from the open timing Bs to the close timing Be. During this period, the air supply pipeline 12 is communicated (opened), and after that period of time, the air supply pipeline 12 is blocked (closed). In this way, the pressurized air 15 is supplied to the main nozzle 10 during the open period B corresponding to the injection period A.

As shown in FIG. 2B, the electromagnetic exhaust valve 14 is composed of, for example, a spring return type electromagnetically driven three-port switching valve, and the electromagnetic opening / closing valve 13 and the main nozzle 10 are connected to each other. Provided in the air supply line 12 between
The air supply conduit 12 is always open (open),
The exhaust timing in the exhaust period C, that is, the exhaust start timing C for the exhaust operation is linked with the weft insertion operation and the injection operation.
During the period from s to the exhaust end timing Ce, the air supply pipe line 12 on the main nozzle 10 side is opened to the atmosphere, or as shown in (3) of FIG. It is composed of an on-off valve,
It is provided in the branch passage of the air supply conduit 12 between the electromagnetic on-off valve 13 and the main nozzle 10, and in the period from the exhaust start timing Cs to the exhaust end timing Ce of the exhaust period C.
The air supply conduit 12 on the main nozzle 10 side is opened to the atmosphere.

During weft insertion, the weft yarn 4 is urged in the weft insertion direction by the sub-nozzles 18 of groups 1 to n (G) in the course of flying along the flight path in the opening 17. These sub-nozzles 18 fly in the opening 15 by directing the pressure air 15 to the flight path of the weft yarn 4 in the flight direction and performing a simultaneous jet or a relay jet in harmony with the flight speed of the weft yarn 4. The running weft 4 is urged in the weft inserting direction. It should be noted that the pressure air 15 is supplied from the pressure air source 11 to the pressure regulator 1
9, the air supply pipeline 22, the electromagnetic opening / closing valve 23 and the electromagnetic exhaust valve 24 in the air supply pipeline 22. The pressure adjuster 19 sets the supply pressure to the sub nozzle 18 to a predetermined pressure value.

Because of the simultaneous injection or the relay injection, the electromagnetic on-off valve 23 is constituted by, for example, a spring return type electromagnetically driven two-port on-off valve as shown in FIG. The air supply conduit 22 is provided in the air supply conduit 22 that connects the pressure air source 11 and the sub-nozzle 18, and the air supply conduit 22 is opened at the opening / closing timing of the opening period B, that is, the opening timing Bs, in conjunction with the weft insertion operation. The communication is made (open), and the air supply pipeline 12 is blocked (closed) at the closing timing Be. The opening period B from the opening timing Bs to the closing timing Be of the electromagnetic opening / closing valve 23 is set for each group, and, of course, from the opening timing Bs to the closing timing Be of the electromagnetic opening / closing valve 13 corresponding to the main nozzle 10. It is set as a value different from the open period B of.

The electromagnetic exhaust valve 24 is the electromagnetic exhaust valve 14
Similarly, as shown in (2) of FIG. 2, it is constituted by, for example, a spring return type electromagnetically driven three-port switching valve,
The air supply pipe 22 is provided between the electromagnetic on-off valve 23 and the sub-nozzle 18 and always communicates (opens) the air supply pipe 22. However, for the exhaust operation in conjunction with the weft insertion operation, During the exhaust period C from the exhaust start timing Cs to the exhaust end timing Ce, the air supply pipeline 22 on the sub-nozzle 18 side is opened to the atmosphere, or as shown in (3) of FIG. 2 port on-off valve, electromagnetic on-off valve 23 and sub-nozzle 1
8 is provided in a branch path of the air supply conduit 22 and opens the air supply conduit 22 on the sub-nozzle 18 side to the atmosphere during the exhaust period C from the exhaust start timing Cs to the exhaust end timing Ce.

It should be noted that the electromagnetic exhaust valve 24 causes the exhaust period C from the exhaust start timing Cs to the exhaust end timing Ce.
In case of simultaneous injection, all groups are set to be the same, and in case of relay injection, each group is set to a state of sequentially shifting in the weft inserting direction. Of course, the exhaust start timing Cs and the exhaust end timing Ce of the electromagnetic exhaust valve 24 are set to the electromagnetic exhaust valve 1 corresponding to the main nozzle 10.
Exhaust start timing Cs and exhaust end timing C in 4
It is set as a unique value different from e.

By the jetting operation of the main nozzle 10 as the weft inserting nozzle and the sub-nozzles 18 of a plurality of groups,
The weft thread 4 which has been normally inserted is woven by the reed 20
After being beaten on the front cloth 21a and woven as the woven cloth 20, it is cut by the yarn supplying cutter 25 on the weft inserting side.

At the time of this weft insertion, the weft feeler 27 is provided in the vicinity of the weft end portion on the side opposite to the weft insertion, facing the weft flight path, and provided at a position where the weft 4 normally inserted can reach.
The arrival of the weft yarn 4 is detected within a predetermined check period, the success or failure of the weft insertion is determined, a weft arrival signal is output when the weft insertion is normal, and a weft stop signal is output when the weft insertion is defective. The signal is sent to the loom controller (not shown). The weft feeler 27 is composed of a light projecting element and a light receiving element toward the flight path (the reed groove of the deformed reed) of the weft 4, but may be of a reflective type or a transmissive type. .

At the position of the length measurement storage device 5, the unwind sensor 26
Is provided in the unwinding path of the weft yarn 4 in a state of facing the peripheral surface of the drum 7, detects passage of the unwound weft yarn 4 and generates a pulse-shaped unwinding signal, and a loom (not shown). Send to controller. The unwinding sensor 26 is of a photoelectric type and is arranged with the light projecting element and the light receiving element facing the peripheral surface of the drum 7. The unwinding sensor 26 detects the passage of the weft yarn 4 by the amount of light reflected from the drum 7 and outputs the pulsed signal. However, it can be constructed as a reflection type or a transmission type.

A solenoid opening / closing valve 1 corresponding to the main nozzle 10.
3 and the electromagnetic exhaust valve 14, and the electromagnetic opening / closing valve 23 and the electromagnetic exhaust valve 24 corresponding to the sub-nozzles 18 of the plurality of groups are controlled by the controller 30 a inside the weft insertion control device 30. This controller 30a includes an encoder 29 connected to a main shaft 28 of an air jet loom and a main shaft 28
Based on the signal of the rotation angle and the injection timing of the injection period A or the opening / closing timing of the opening period B set by the setting device 31, the opening / closing command to the electromagnetic on-off valves 13 and 23, the signal of the rotation angle and the setting device 31 Based on the set exhaust timing of the exhaust period C, the electromagnetic exhaust valve 1
The exhaust command to 4 and 24 is output, and the solenoid on-off valve 1
In addition to controlling the opening / closing operation of 3, 23 and the exhaust operation of the electromagnetic exhaust valves 14, 24, thread locking of the operating device 9 of the locking pin 8
Control the unwinding operation.

As described above, the injection period A is set by the injection start timing As and the injection end timing Ae as the injection timing, and the open period B is set by the open timing Bs and the close timing Be as the open / close timing. The exhaust period C is set by the exhaust start timing Cs and the exhaust end timing Ce as the exhaust timing. Here, the injection period A
(Injection start timing As / injection end timing Ae)
And the open period B (open timing Bs / close timing Be) directly correspond to each other and are usually set to have substantially the same timing, but there is an operation delay in the electromagnetic exhaust valves 14 and 24,
When this is so large that it cannot be ignored, the electromagnetic exhaust valve 14, during the opening period B (opening timing Bs / closing timing Be),
The operation delay of 24 is set as a timing earlier than the injection period A (injection start timing As / injection end timing Ae) on the rotation angle or time axis.

FIG. 3 shows a specific configuration of the setting device 31. The setting device 31 of FIG. 2 includes a main nozzle 10 as a weft insertion nozzle and a plurality of groups of sub nozzles 18.
Of the injection end timing Ae of the injection period A, that is, the exhaust start timing Cs of the electromagnetic exhaust valves 14 and 24 of the exhaust period C in accordance with the change of the closing timing Be of the open / close valves 13 and 23. The opening / closing valve timing setting device 32, the exhaust valve timing setting device 33, and the correction means 3 for timing correction are used as the timing setting device.
Including 4.

The on-off valve timing setting device 32 is configured to inject the injection start timing As and the injection end timing Ae of the main nozzle 10 and the sub-nozzles 18 of the plurality of groups in the injection period A or the opening timing Bs of the electromagnetic on-off valves 13 and 23 corresponding thereto. , The closing timing Be is stored, and these are sent to the controller 30a as an opening / closing command during operation, and the closing timing Be is sent to the correcting means 34. In addition, the exhaust valve timing setting device 33 includes electromagnetic exhaust valves 14 and 2 corresponding to the main nozzle 10 and the sub nozzles 18 of the plurality of groups.
4 exhaust start timing Cs, exhaust end timing Ce
Are stored in the controller 30 as an exhaust command during operation.
Send to a. Exhaust start timing Cs as an exhaust command
Is sent to the controller 30a via the correction means 34, and the exhaust end timing Ce as the exhaust command is the controller 30a.
sent directly to a.

The correction means 34 includes a correction signal generator 35 and an adder 36. The correction signal generator 35 stores, for example, the closing timing Be of the open period B at the time of initial setting and newly inputs it. The difference between the closing timing Be of the opening period B and the stored value of the closing timing Be at the initial setting is output to the adder 36 as a signal of the correction amount ΔBe. The adder 36 adds the signal of the correction amount ΔBe to the exhaust start timing Cs at the time of initial setting, and outputs a new exhaust start timing Cs matching the new close timing Be to the controller 30a.

For example, the injection end timing Ae of the injection operation
When the closing timing Be of the electromagnetic opening / closing valve 13 is changed by the correction amount ΔBe = −10 ° due to the change of
Is the currently set exhaust start timing Cs = 24
A new exhaust start timing Cs = 230 ° obtained by adding 0 ° to -10 ° is sent to the controller 30a. Of course, the injection end timing Ae can be changed not only in the minus direction, that is, in the direction of advancing the timing, but also in the plus direction, that is, in the direction of delaying the timing, and the exhaust start timing Cs is also modified accordingly. .

As described above, when the closing timing Be of the electromagnetic opening / closing valve 13 is changed, the correcting means 34 automatically corrects the exhaust start timing Cs of the electromagnetic exhaust valve 14 by the correction amount ΔBe corresponding to the change amount. . Similarly, when the closing timing Be of the electromagnetic opening / closing valve 23 is changed, the correcting unit 34 automatically corrects the exhaust start timing Cs of the electromagnetic exhaust valve 24 by the correction amount ΔBe corresponding to the change amount.

FIG. 4 shows, on the rotation angle of the main shaft 28,
As an example of the weft insertion nozzle, the main nozzle 1 has a setting example of the injection period A of the main nozzle 10, the opening period B of the electromagnetic opening / closing valve 13, and the exhaust period C of the electromagnetic exhaust valve 14, and the setting example thereof.
The injection situation of the pressure air 15 from 0 is shown. (1) of FIG. 4 is before the change of the injection period A, the opening period B, and the exhaust period C, and the opening timing Bs of the electromagnetic opening / closing valve 13 is based on the injection start timing As and the injection end timing Ae of the injection period A. , The closing timing Be is 150, respectively.
The exhaust start timing Cs and the exhaust end timing Ce of the electromagnetic exhaust valve 14 are set to 240 ° and 300 °, respectively.

FIG. 4B shows after the injection period A, the open period B and the exhaust period C are changed, and the electromagnetic opening / closing valve is based on the injection start timing As and the injection end timing Ae of the changed injection period A. The opening timing Bs and the closing timing Be of the electromagnetic on-off valve 13 of No. 13 are 150 ° and 240, respectively.
It is set as °. At the time of this change, the correction means 3
4 indicates the exhaust start timing Cs of the electromagnetic exhaust valve 14 corresponding to the change amount of the closing timing Be = 250 ° → 240 °.
Is automatically calculated, and the exhaust start timing Cs and the exhaust end timing Ce are set to 230 ° and 300 °, respectively. Before and after the change, the angle difference between the closing timing Be and the exhaust start timing Cs (10
(°) is set to compensate for the response delay of the electromagnetic exhaust valve 14.

By setting the timing as shown in FIG. 4, the injection period A of the pressurized air 15 is (1) in FIG. 4, injection start timing 150 ° to injection end timing 250 °, and injection is performed in (2) in FIG. The start timing is 150 ° to the injection end timing 240 °. Therefore, the injection of the pressurized air 15 (fumes) is performed over the injection period A described above.

The injection period A for the sub-nozzles 18 of each group, the opening period B of the electromagnetic opening / closing valve 23, and the electromagnetic exhaust valve 2
The setting of the exhaust period C of 4 and the injection state of the pressurized air 15 from the sub-nozzle 18 at that time are the same as in FIG. Of course, as described above, the injection period A, the opening period B, and the exhaust period C for the sub-nozzle 18 are the main nozzle 1
A value different from the injection period A, the open period B, and the exhaust period C corresponding to 0 is set on the rotation angle of the main shaft 28.

As described above, the opening / closing timings of the electromagnetic opening / closing valves 13 and 23 and the exhausting timings of the electromagnetic exhaust valves 14 and 24 can be set independently of each other. Of course, since the electromagnetic on-off valves 13 and 23 control the injection operation of the main nozzle 10 as the weft insertion nozzle and the sub-nozzles 18 of the plurality of groups, the injection start timing As and the injection end timing Ae of the injection period A are , Is adjusted according to the operating condition of the loom.

On the other hand, the electromagnetic exhaust valves 14 and 24 include the main nozzle 10 and the sub-nozzles 18 of a plurality of groups.
Since the residual air in the air supply pipe lines 12, 22 or its residual pressure is discharged after the end of the injection, the exhaust start timing Cs and the exhaust end timing Ce correspond to the closing timing Be of the electromagnetic on-off valves 13, 23. Is set. Therefore, the exhaust start timing Cs of the electromagnetic exhaust valves 14 and 24 is the closing timing Be of the electromagnetic opening / closing valves 13 and 23.
However, preferably, as in the above setting example, the response delay of the electromagnetic exhaust valves 14 and 24 is taken into consideration to obtain the maximum exhaust effect, so that the response delay is earlier than the closing timing Be. It is set as timing. Even if the exhaust start timing Cs is less than the response delay of the electromagnetic exhaust valves 14 and 24, the exhaust effect corresponding to the advanced amount can be expected.

If the exhaust start timing Cs is advanced more than the response delay, the pressure air 15 in the injection period A is exhausted, which is not preferable from the viewpoint of wasting the pressure air 15. On the other hand, the exhaust end timing Ce
Needs to be substantially closed from the time when the exhaust operation is completed to the start of the next injection operation at the latest, and strict setting such as the exhaust start timing Cs is unnecessary.

As described in the section of the prior art, generally, due to the residual air / residual pressure of the compressed air 15 in the air supply pipelines 12 and 22, even after the closing timing Be, the residual pressure as shown by the broken line is shown. Fume appears. Therefore, the controller 30a
The electromagnetic exhaust valves 14 and 24 are driven by the exhaust command,
Pressure air 1 remaining in the air supply lines 12 and 22
5 is positively discharged to the atmosphere at the injection end timing Ae. As a result, the main nozzle 10 and the sub-nozzles 18 of the plurality of groups have the injection end timing Ae.
After the lapse of time, the injection is promptly stopped and almost no residual pressure fumes are emitted.

The exhaust effect depends on the weft insertion nozzles (main nozzle 10 and sub-nozzles 18 of a plurality of groups). The exhaust from the main nozzle 10 and the sub-nozzles 18 in the upstream-middle stream group in the weft insertion direction is effective in reducing the damage caused by the air flow on the weft yarn 4. On the other hand, sub nozzle 1
8 moves in and out of the opening 17 due to the opening movement of the warp 16 and the repulsion movement of the reed 20, so that the residual pressure airflow of the sub-nozzle 18 directly hits the warp 16 depending on the opening state of the warp 16 and damages the warp 16. give. From this fact, the exhaust from the sub-nozzles 18 in the downstream group is effective in reducing the damage caused by the air flow on the upper and lower warps 16 at the openings 17.

In the conventional apparatus, when the administrator forgets to change the exhaust start timing, the following problems occur as described above. When the injection end timing is changed to an earlier timing, the start of exhaust is delayed and the exhaust effect is reduced, so the residual pressure fumes damage the wefts and warps. Also,
When changing to a direction that delays the injection end timing, as a result, exhaust will start before the injection end, and the original purpose improvement of the weft insertion state cannot be realized,
Further, the weft inserting fluid (pressure air) is wasted.

In FIG. 3, the opening / closing valve timing setting device 32 corresponding to the electromagnetic opening / closing valves 13 and 23 and the electromagnetic exhaust valves 14 and 24 are shown.
Is provided separately from the exhaust valve timing setter 33, but these open / close valve timing setters 32,
The exhaust valve timing setting device 3333 may be provided as one timing setting device collectively, or a timing setting device having both timing setting functions may be provided, and the all-weft insertion nozzle (main nozzle 10 and sub-nozzles of a plurality of groups may be provided. It is also possible to individually set the injection timing and the exhaust timing of 18).

The weft inserting device 1 of the air jet loom shown in FIG.
Is one-color weft insertion, but when the weft insertion device 1 of the air jet loom is a multi-color weft insertion device, the length measurement storage device 5 and the main nozzle 10 are provided for each type of weft yarn 4, and the main nozzle 10 And the injection start timing As of the sub nozzle 18
Injection end timing Ae and exhaust start timing Cs
The exhaust start timing Ce is also set according to the yarn type. When the weft selection signal is input to the weft insertion control device 30 (control device 30a), the weft insertion control device 30 (control device 30)
a) shows the electromagnetic on-off valves 13 and 23, the electromagnetic exhaust valve 1 according to the specific timing setting corresponding to the selected weft thread 4.
4 and 24 will be driven.

Next, FIG. 5 shows another specific setter 31.
Is shown. The setting device 31 changes the injection end timing Ae of the sub-nozzles 18 of the final group (nth group) as an example according to the flying condition of the weft 4 (timing to reach the non-feeding side), and accordingly, Then, the corresponding closing timing Be of the electromagnetic opening / closing valve 23 and the corresponding exhaust start timing Cs of the electromagnetic exhaust valve 24 are corrected. Of course, the change target is the sub nozzle 18 of the final group (nth group).
However, the sub nozzles 18 of all groups or groups other than the final group or the main nozzles 10 may be used.

In FIG. 5, a setter 31 is an open / close valve timing setter 32, an exhaust valve timing setter 33, and a correction means 3.
4 (correction signal generator 35, adder 36, reference timing setter 39), adder 37 and arrival angle detector 38.

The arrival angle detector 38 is used for the weft feeler 27.
The weft arrival signal of the weft yarn 4 from and the rotation angle signal from the encoder 29 are input, and the correction signal generator 3 uses the rotation angle signal when the weft arrival signal is input as the arrival timing.
Output to 5. Here, the correction signal generator 35 compares the detected arrival timing with the arrival timing of the target (reference) preset by the reference timing setting device 39, and calculates the deviation Δθ from the difference between the comparison results. , And sends it to the adders 36 and 37 as a signal of the correction amount Δθ.

Here, the adder 37 adds the correction amount Δθ to the injection end timing Ae or the closing timing Be of the on-off valve timing setting device 32, and the sum thereof is set as a new injection end timing Ae and closing timing Be. It is sent to the controller 30a of the weft insertion control device 30. Also, the adder 36
Is added to the exhaust start timing Cs of the opening / closing valve timing setter 32 by the correction amount Δθ, and the sum is used as a new exhaust start timing Cs for the controller 30 of the weft insertion control device 30.
Send to a. In this way, the setter 31 corrects the injection end timing Ae, the closing timing Be, and the exhaust start timing Cs according to the actual flying condition of the weft 4 (timing to reach the non-feeding side), and the final group The exhaust period C of the (nth group) sub-nozzle 18 is changed.

It should be noted that the weft 4
The injection end timing Ae and the exhaust start timing Cs are delayed when the arrival of the weft yarn is late, and conversely, the injection end timing Ae and the exhaust start timing Cs are advanced when the weft yarn 4 arrives earlier than the target arrival timing. As a result, in the weft insertion process, the weft yarn 4 reaches the cloth edge on the side opposite to the weft insertion within the range of the target arrival timing.

Therefore, the weft insertion control device 30 (controller 30a) does not change the injection timing of the main nozzle 10 or the sub nozzles 18 of the group upstream of the nth group, but by the above change control, the final group (nth group) The corresponding electromagnetic opening / closing valve 23 and electromagnetic exhaust valve 24 are operated according to the changed injection end timing Ae and the changed exhaust start timing Bs for the sub-nozzles 18 of the (group). As a result, the pressure air 15 for weft insertion can be saved because the sub-nozzles 18 are not jetted for more than the required period, and damage to the wefts 4 and the warp 16 at the openings 17 can be reduced.

The correction of the exhaust start timing Cs is more preferable if it can be reflected in the weft insertion in the weft insertion cycle in which the arrival of the weft 4 is detected. Therefore, if the time is enough, the arrival of the weft 4 is detected. It is executed in the weft insertion cycle, but if it is not in time, it is executed so as to be reflected in the weft insertion of the next weft insertion cycle in which the arrival of the weft thread 4 is detected. Although the cycle of timing correction is every weft insertion cycle, it may be every weft insertion cycle of several picks.

The following are possible modes of timing correction. (1) When the arrival timing of the weft yarn 4 varies widely, a statistical value such as an average value of the arrival timing detected over a predetermined number of picks is used.
(2) When the flying characteristics of the weft yarn 4 suddenly change temporarily such as when the yarn feeder 3 is switched, the above timing correction is reset and returned to the initial set value as necessary. (3) The range of timing correction can be limited by means such as a limiter in order to avoid an adverse effect on operation due to excessive timing correction.

In the example of FIG. 5, the weft filler 27 is used to detect the arrival timing of the tip of the weft 4.
As an alternative, the unwinding sensor 26 arranged in the length measurement storage device 5 may be used. The unwinding sensor 26 detects the unwinding number of the unwound yarn 4 to be unwound and outputs a plurality of pulse signals. The timing of generation of these pulse signals is at the tip of the weft yarn 4 on the flight path of the weft yarn 4. This is because it corresponds to the reaching distance of.

3 and 5, the internal configuration of the setter 31 and the correction means 34 in the setter 31 is not limited to those shown in FIGS. 3 and 5, and a control computer and software may be used. It can also be configured by utilizing. The function of correcting the exhaust timing includes other weft insertion control, for example, pressure control by the pressure adjuster 19 that makes the arrival timing of the weft yarn 4 constant, and the weft insertion nozzle (main nozzle 10 / sub nozzle 1).
The injection timing control of 8) may be combined and implemented.

The weft insertion nozzle to be subjected to exhaust control is only the main nozzle 10 or any one of the sub nozzles 18 of the first to nth groups, depending on the generation state of the residual pressure air 15.
Only one group or a combination of two or more groups,
A combination of the main nozzle 10 and any one or more of the first to nth groups is used. The timing is corrected not only by the exhaust start timing Cs but also by the exhaust start timing Cs in the same manner as the exhaust start timing Cs.
You can also do about. The timing setting is
Since the time corresponding to the rotation angle may be used as a reference instead of the rotation angle of the main shaft 28, the meaning of the rotation angle should be understood as a concept including time.

As already mentioned, the invention is also applicable to multicolor weft weaving looms. In the multicolor weft insertion, the injection period A (injection start timing As / injection end timing Ae) is set in accordance with the selected weft yarn type 4, so the exhaust period C (exhaust start timing Cs / exhaust end The correction function of the timing Ce) is also applied to a device that sets according to the yarn type.

Further, the nozzle to be exhausted is not limited to the weft insertion nozzle of the air jet loom, and for example, a weft tension applying device for exerting a tension on the weft by the jet flow from the nozzle or a weft end is used for cutting. It may be a nozzle of a device that causes the jet flow from the nozzle to act on the yarn, such as a tuck-in device that folds the yarn end back into the opening by the jet flow from the nozzle to form a tuck-in selvage.

[0056]

According to the first aspect of the present invention, in the air injection device of the loom, the operation timings of the electromagnetic on-off valve and the electromagnetic exhaust valve can be independently set in the setter, so that the response delay of the electromagnetic exhaust valve is reduced. When the exhaust start timing can be set in consideration, and when the closing timing of the electromagnetic on-off valve is changed, the correction means automatically corrects the exhaust start timing of the electromagnetic exhaust valve according to the change amount of the closing (injection end) timing. Therefore, it is not necessary to purposely correct the exhaust start timing of the electromagnetic exhaust valve according to the injection timing of the nozzle or its change, and the setting work is simplified.

According to the second aspect of the present invention, the correction means corrects the exhaust start timing based on the difference between the timing when the weft tip reaches the predetermined position and the target arrival timing. The residual air in the air supply conduit can be quickly exhausted, and the damage to the weft and the warp can be reliably reduced compared to the conventional case.

According to the third aspect, the operation timings corresponding to the yarn types selected by the setter are respectively set, and the correction means corresponds to the selected yarn types in accordance with the change of the closing timing of the electromagnetic opening / closing valve. Since the exhaust start timing of the exhaust valve to be corrected is corrected, an appropriate timing corresponding to the yarn type can be set.

[Brief description of drawings]

FIG. 1 is a system diagram of an air injection device of a loom (weft insertion device of an air jet loom).

FIG. 2 is an explanatory diagram of an electromagnetic opening / closing valve and an electromagnetic exhaust valve.

FIG. 3 is a block diagram of a setter and a controller.

FIG. 4 is an explanatory diagram of an injection period, an open period, an exhaust period, and an injection situation.

FIG. 5 is a block diagram of another setter and controller.

[Explanation of symbols]

1 Loom air injection device (weft insertion device for air jet loom) 2 Holder 3 Yarn feeder 4 Weft yarn 5 Length measurement storage device 6 Rotating yarn guide 7 Drum 8 Locking pin 9 Operating device 10 Main nozzle 11 Pressure air source 12 Air Supply line 13 Electromagnetic on-off valve 14 Electromagnetic exhaust valve 15 Pressure air 16 Warp 17 Opening 18 Sub-nozzle 19 Pressure regulator 20 Reed 21 Woven fabric 21a Weaving cloth 22 Air supply line 23 Electromagnetic on-off valve 24 Electromagnetic exhaust valve 25 Yarn supply cutter 26 Unwinding sensor 27 Weft feeler 28 Spindle 29 Encoder 30 Weft insertion control device 30a Controller 31 Setting device 32 Opening / closing valve timing setting device 33 Exhaust valve timing setting device 34 Correcting means 35 Correction signal generator 36 Adder 37 Adder 38 Arrival angle Detector 39 Reference timing setting device

Claims (3)

[Claims] 1. An electromagnetic on-off valve provided in an air supply pipe line connecting a pressure air source and a nozzle, and an air supply pipe provided between the electromagnetic on-off valve and the nozzle and communicating with the nozzle. An electromagnetic exhaust valve that opens the passage to the atmosphere, a setting device that sets the timing for operating the electromagnetic opening / closing valve and the electromagnetic exhaust valve, and the electromagnetic opening / closing valve based on the rotation angle of the loom and the timing from the setting device. And a controller that outputs an operation command to the electromagnetic exhaust valve, wherein the setting device is a timing setting device capable of independently setting each timing of the electromagnetic opening / closing valve and the electromagnetic exhaust valve, and An air injection device for a loom, comprising: a correction unit that corrects an exhaust start timing of the electromagnetic exhaust valve according to a change amount of a closing timing of the electromagnetic opening / closing valve. 2. The correction means corrects the exhaust start timing of the electromagnetic exhaust valve based on the difference between the arrival timing at which the tip of the weft reaches a predetermined position in the flight path of the weft and the arrival timing of the target. The air injection device for a loom according to claim 1, wherein: 3. The setting device is set with a timing for operating the electromagnetic opening / closing valve and a timing for operating the electromagnetic exhaust valve corresponding to a selected weft yarn type, respectively. The air injection device for a loom according to claim 1 or 2, wherein the correction means corrects the exhaust start timing of the electromagnetic exhaust valve corresponding to the selected yarn type in accordance with the change of the closing timing. .