JP3044897B2 - Weft insertion method in jet loom - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft insertion method in a jet loom, and more particularly to a method for injecting a fluid by correcting an injection timing based on at least one weft detector and a signal from the weft detector. The present invention relates to a weft insertion method in a jet loom having a plurality of auxiliary nozzles.

[0002]

2. Description of the Related Art Conventionally, in a jet loom in which a weft is caused to flow by a jet fluid from a main nozzle, a plurality of auxiliary nozzles are provided along a flight path in a warp shed, and a plurality of auxiliary nozzles are provided. The weft is accelerated and flown by fluid injection. The fluid ejection from the auxiliary nozzle is performed from upstream to downstream by a relay-type ejection, and the ejection timing is set for each weft to be used.

In order to ensure the flight of the weft, a weft detector is disposed in the warp shed and the injection timing of the downstream auxiliary nozzle is controlled based on a detection signal from the weft detector. (Japanese Patent Laid-Open No. 58-3624)
No. 2).

There is already known a device which controls not only the injection timing but also the injection pressure based on a detection signal from such a weft detector (Japanese Patent Laid-Open No. 622-2 / 1987).
No. 57441). That is, when the weft arrival time detected by the weft detector is faster or slower than a predetermined allowable range, the injection pressure from the auxiliary nozzle acting after this weft detection is corrected, and the weft deceleration is performed. Alternatively, acceleration is performed.

Specifically, in order to speed up the response operation based on the signal from the weft detector, a supply tank for high pressure and a supply tank for low pressure are prepared in addition to the supply tank for standard pressure, and the weft detector is provided. If the arrival time of the weft detected by is slow, the fluid ejected from the downstream auxiliary nozzle is supplied from the high-pressure supply tank to accelerate the flight speed of the weft, and if the arrival time of the weft is fast, The fluid jetted from the downstream auxiliary nozzle is supplied from a low-pressure supply tank to reduce the flight speed of the weft.

[0006]

However, according to the weft insertion method described in Japanese Patent Application Laid-Open No. 62-257441, if the flight of the weft is delayed, the weft is detected downstream from the leading end of the weft detected by the weft detector. Only the injection pressure of the auxiliary nozzle on the side (weft insertion end side) is corrected, there is no time margin to recover the delay of the weft yarn, and the injection pressure needs to be corrected to a considerably high pressure. For this reason, there has been a problem that a weft insertion error is induced, for example, a yarn breakage due to excessive tension of the weft.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem. Even if the flight speed of a weft is changed during flight, a jet loom such as yarn breakage does not occur. The purpose of the present invention is to provide a weft insertion method.

[0008]

In order to achieve the above object, the present invention provides at least one weft detector and corrects the injection timing based on a signal from the weft detector to inject a fluid. In a weft insertion method in a jet loom having a plurality of auxiliary nozzles, an actual weft tip arrival timing at a predetermined position in a weaving width is grasped for each weft insertion based on a signal from the weft detector, and grasped. The actual weft tip arrival timing is compared with a preset arrival timing, and based on the comparison result, the injection timing for both the upstream and downstream auxiliary nozzles of the predetermined position is corrected, and the actual weft tip arrival timing is grasped. During the weft insertion, the fluid is ejected from the auxiliary nozzle at the corrected ejection timing.

[0009]

According to the present invention, the actual arrival timing of the weft tip at a predetermined position in the weaving width is determined for each weft insertion based on the signal from the weft detector, and the determined actual arrival timing of the weft tip is determined by a predetermined arrival timing. If the predetermined position is set as the position of the weft detector based on the comparison result, based on the comparison result, not only the auxiliary nozzle downstream of the weft detector but also the auxiliary nozzle upstream thereof. During the weft insertion, fluid is ejected from each auxiliary nozzle at the compensated ejection timing. Therefore, when the arrival time of the weft is slow, the entire weft is accelerated with a substantially uniform acceleration, the delay can be quickly recovered, and the weft does not become excessively tensioned. In addition, the entire weft is decelerated almost uniformly, and the weft does not buckle. Thus, the time for the weft to reach the weft feeler can be adjusted without breaking the yarn or impairing the feel of the woven fabric.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a jet loom in a jet loom shown in FIG.

In FIG. 1, reference numeral 1 denotes a main nozzle for injecting a weft Y. The weft Y injected from the main nozzle 1 into a warp opening S is provided with a number of auxiliary nozzle groups 2, 3, and 3.
It is sequentially accelerated by the air jets of the auxiliary nozzles 4, 5, and 6, and reaches the weft feeler at the weave end. Each of the auxiliary nozzle groups 2 to 6 includes a plurality of auxiliary nozzles 2a,
2b, 2c, 2d, 2e, 3a to 3e, 4a to 4e, 5
a to 5e and 6a to 6e. The auxiliary nozzles of each group have their confluences 8, 9, 10, 11 and 12, respectively, and the injection pressure of the auxiliary nozzles of each group is the same.

The compressed air supply tank 13 is formed as a long hollow body along the machine base, and communicates with a pressure air source 15 via a regulator 14 capable of adjusting the pressure. Supply tank 13 and each junction 8 of auxiliary nozzle groups 2 to 6
In the pipelines 16 to 20, which communicate with each other, the throttles 21 to 25 for restricting the flow rate in order to adjust the injection pressure of each of the auxiliary nozzle groups 2 to 6 (relative to the pressure of the supply tank), In order to control the injection timing of each of the auxiliary nozzle groups 2 to 6, electromagnetic valves 27 to 31 controlled by the controller 26 are provided.

A plurality of weft detectors 32 to 36 are provided in the warp shed S together with the auxiliary nozzle, detect the arrival timing of the flying weft, and transmit the signal to the controller 26. The controller 26 includes:
The weft arrival signal from the weft feeler 7 is also input naturally. Further, the controller 26 includes each weft detector 32.
A preset weft arrival timing at the installation positions of ~ 36 is input, and a comparison judgment function is provided for comparing the actual weft arrival timing with the preset weft arrival timing. Further, other information necessary for weft insertion, such as a signal from a pressure sensor 37 that detects the actual fluid pressure of the supply tank 13, is input to the controller 26.

Each of the auxiliary nozzle groups 2 to 6
The first bypasses 47 to 51 having solenoid valves 37 to 41 and variable throttles 42 to 46 controlled by the controller 26 for the conduits 16 to 20 to the merging portions 8 to 12, and also controlled by the controller 26 Solenoid valves 52-5
6 and variable bypasses 57 to 61 having second bypasses 62 to 62
66 are provided (see FIG. 2).

As for the auxiliary nozzle group 2, the variable throttle 42 of the first bypass 47 is opened from the throttle 21 of the conduit 16 and is substantially not throttled. The variable throttle 57 of the second bypass 62 is connected to the pipe 1
The aperture 21 is narrowed down. Accordingly, the amount of air passing through the first bypass 47 is large, and high-pressure air can be injected from each of the auxiliary nozzles 2a to 2e, and the amount of air passing through the second bypass 62 is small as compared with the case where only the conduit 16 is provided. ,
As compared with the case of the pipeline 21, low-pressure air is injected from the auxiliary nozzles 2a to 2e. The first bypass 4
When the high pressure air is injected from each of the auxiliary nozzles 2a to 2e by omitting 7, the amount of air passing through the second bypass 62 may be adjusted to the amount of air passing through the conduit 16 at the junction 8.

Now, the actual weft arrival timing detected by the weft detector 34 is compared with a predetermined arrival timing set in advance, and if a delay exceeding a permissible range in the weft flight is detected. In response to an instruction from the controller 26, the solenoid valves 37, 38 and 39 are opened, and high-pressure air is injected from the auxiliary nozzles 2a to 2e, 3a to 3e, 4a to 4e and 5a to 5e, and the weft Y increases. Will be speeded up. This speed increase is performed at the auxiliary nozzles 2a to 2e and 3a to 3e upstream of the position of the weft detector 34 which is a predetermined position.
Since this is also performed in 3e, the delay is quickly recovered, and the weft yarn Y is not strained. Therefore, not only does the weft insertion error not occur, but also the hand of the woven fabric does not change.

If the delay in the weft detector 35 is within an allowable range, it is not necessary to inject air from each auxiliary nozzle more than the ordinary relay type injection. To perform air injection. Weft detector 3
5, the high-pressure air continues to flow through the auxiliary nozzle groups 2a to 2e, 3a to 3e, and 4a to 4
e, 5a-5e and 6a-6e. Further, when the weft detector 36 detects a delay of the weft flight beyond the allowable range, the solenoid valves 38, 39, 40 and 41 are opened by a command from the controller 26 based on the signal, and Auxiliary nozzle groups 3, 4,
High-pressure air is injected from each of the auxiliary nozzles 5 and 6, and the weft Y is uniformly accelerated from upstream to downstream to increase the speed (the shaded portion in FIG. 3 indicates the high-pressure component). Therefore, the time required for the weft Y to reach the weft feeler 7 is reduced without breaking the yarn or impairing the feeling of the woven fabric.

If the weft detector 34 detects that the arrival time of the weft exceeds the allowable range, the solenoid valve 3
0 is closed and the solenoid valves 52 to 55 are opened, so that low-pressure air is jetted from each of the auxiliary nozzles of the corresponding auxiliary nozzle groups 2, 3, 4 and 5, and the flight speed of the weft Y is reduced. Will be done. Even if the speed is reduced, if the weft detector 35 detects a speed exceeding the allowable range in the arrival time of the weft, the same is repeated (see FIG. 4).

In this case, since the weft Y is decelerated by the uniform injection of low-pressure air from upstream to downstream, there is no buckling of the weft and the time to reach the weft feeler 7 is adjusted (FIG. 4). (The shaded area is the decompression part). When decelerating the weft, instead of the above-described method, the injection pressure of the auxiliary nozzles after the weft detector may be corrected to a low pressure, or the injection timing may be corrected to perform the relay injection. In this case, the degree of deceleration can be further increased.

The first bypass 47 to 51 and the second bypass 47 to 51
The variable throttles 42 to 46 and 57 are provided in the bypasses 62 to 66.
When the weft is replaced with a new yarn, the amount of squeezing is adjusted appropriately. Also,
Regarding the first bypasses 47 to 51, in particular, the throttles 42 to 4
6 need not be provided.

The same operation and effect can be obtained by connecting the first bypass to the high-pressure supply tank and the second bypass to the low-pressure supply tank.

According to another embodiment of the present invention, when the delay is detected by the weft detector 34, as shown in FIG. 5, the auxiliary nozzle group 3 continues the injection with the normal injection pressure, and The high-pressure air is ejected from the auxiliary nozzle group 5 that has the greatest influence. In this case, the air consumption can be reduced. That is, even if high-pressure air is injected from the auxiliary nozzle group closest to the weft end, which most affects flight, and the pressure is reduced as the distance from the auxiliary nozzle group increases, almost the same effect can be obtained. Air consumption can be reduced. Note that this embodiment is preferably performed when the arrival delay of the weft is small, and when the delay is large, it is preferable to use an example in which high-pressure fluid is ejected from all the auxiliary nozzles described above. You should use them properly.

[0023]

According to the present invention, based on the signal from the weft detector, not only the auxiliary nozzles downstream from the weft detector but also the auxiliary nozzles upstream from the weft detector use the corrected injection pressure and injection timing to control the fluid. So that the weft does not become tensed even when speeding up, and the weft does not relax when decelerating.
A woven fabric having a uniform texture can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic illustration of a weft insertion device suitable for carrying out the method of the present invention.

FIG. 2 is an enlarged explanatory view of a main part of the device shown in FIG. 1;

FIG. 3 is a diagram showing a change in the injection pressure from each auxiliary nozzle when the speed is increased.

FIG. 4 is a diagram showing a change in injection pressure from each auxiliary nozzle in the case of deceleration.

FIG. 5 is a diagram showing a change in the injection pressure of each auxiliary nozzle when another method of the present invention is carried out.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Main nozzle 2,3,4,5,6 Auxiliary nozzle group 7 Weft feeler 8,9,10,11,12 Merging part 13 Supply tank 14 Regulator 15 Pressure air source 16,17,18,19,20 Pipe 21, 22, 23, 24, 25 throttle 26 controller 27, 28, 29, 30, 31 solenoid valve 32, 33, 34, 35, 36 weft detector 37, 38, 39, 40, 41, 52, 53, 54, 5
5,56 solenoid valve 42,43,44,45,46,57,58,59,6
0,61 Variable throttle 47,48,49,50,51 First bypass 62,63,64,65,66 Second bypass Y Weft S Warp shedding

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-81653 (JP, A) JP-A-2-26960 (JP, A) JP-A-62-257441 (JP, A) JP-A 58-81641 36242 (JP, A) JP-A-62-125049 (JP, A) JP-A-3-104964 (JP, A) JP-A-3-64552 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) D03D 47/28-47/38

Claims (1)

(57) [Claims] 1. A weft insertion method in a jet loom having at least one weft detector and a plurality of auxiliary nozzles for injecting a fluid by correcting an injection timing based on a signal from the weft detector, grasp the actual weft leading end arrival timing at a predetermined position in the width signal on the basis of woven from the weft detector for each weft insertion, it is grasped
Actual weft leading end arrival timing is compared with a preset arrival timing, the injection timing for the auxiliary nozzles of both upstream and downstream of the predetermined position is corrected based on the comparison result, the actual weft leading end arrival timing was
Weft insertion method in a jet room in the weft during insertion after grasping, characterized Rukoto is jetted fluid from Ri by the corrected injection timing <br/> auxiliary nozzle.