JPS6312738A - Wefting method in jet loom - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial Field of Application) The present invention relates to a method of controlling the injection timing of an injection fluid that makes weft threads fly.

(Prior art) A plurality of auxiliary nozzles are arranged along the flight path of the weft yarn that is injected from the main weft insertion nozzle into the warp opening and inserted,
In the weft insertion method in which the weft is caused to fly by relay jetting from these auxiliary nozzles, relay jetting control in the auxiliary nozzle is extremely important in improving weft insertion stability.

Therefore, in the weft insertion method disclosed in JP-A-56-107046, a weft detector is placed at the end of the weave width, and the preset weft tip arrival time and the actual weft tip arrival time at the weft detector installation position are The timing at which the weft tip reaches the end of the weft is compared, and the fluid injection pressure is controlled based on the comparison result. or,
In the weft insertion method disclosed in Japanese Unexamined Patent Publication No. 58-36242, the tip of a flying weft is detected by a weft detector,
Based on this detection signal, the injection timing of the auxiliary nozzle downstream of the same weft detector is controlled. That is, the pulse motor for controlling the opening and closing of the mechanical valve that controls the injection timing in the auxiliary nozzle receives a predetermined operation command from the control circuit based on the weft tip detection signal from the weft yarn detector, thereby opening and closing the mechanical valve. controlled.

In this control process, due to the responsiveness of the pulse motor, the length of the fluid conduit, etc., a delay time occurs between the time when the weft tip detection signal is sent and the time when the fluid is ejected from the auxiliary nozzle. Therefore, the number of auxiliary nozzles whose injection timing is controlled by the weft tip detection signal is small (in other words, the number of auxiliary nozzles is positioned downstream of the weft yarn detector by a distance corresponding to the delay time and the weft flying speed, and fluid injection is started at the same position). The timing and the time when the weft tip reaches are synchronized.

(Problem to be Solved by the Invention) However, in the weft insertion method disclosed in Japanese Patent Application Laid-Open No. 56-107046, the injection timing is fixed to the initial setting, and therefore the injection start timing is set at the fastest speed of the weft. It is necessary to set the injection end timing in consideration of the flight and the slowest flight of the weft. In other words, the jetting time width must be set large in consideration of variations in the weft flight time, and waste of jetting fluid is unavoidable.

On the other hand, according to the weft insertion method disclosed in Japanese Patent Application Laid-open No. 58-36242, injection timing control in an auxiliary nozzle located a predetermined distance downstream from a weft detector within the weaving width is based on the detection of the weft tip by the weft detector. Can be controlled for each weft insertion,
It is possible to reduce fluid consumption. However, the timing control in this weft insertion method ultimately depends on the weft flight speed. For example, if the weft flight is slow, the injection timing is controlled to match this slow flight, eliminating the delay in weft flight. I can't. Therefore, unless the operator controls the injection pressure, the occurrence of weft insertion troubles is unavoidable.

Structure of the Invention (Means for Solving the Problems) Therefore, in the present invention, a weft detector for detecting the tip of the weft that is guided in flight through the warp opening by a jetting fluid is disposed near the end of the weaving width, and a preset The weft tip position information from the weft yarn detector detects the tip of the inserted weft at the specified injection timing, and the appropriate injection timing is selected or calculated, and the selected or calculated injection timing is used as the set injection timing. If the timing is different, the set injection timing is corrected to the calculated or selected injection timing.

(Function) In other words, by changing the set injection timing as described above in accordance with the actual weft flying state while the loom is operating, the injection time width is narrowed by the injection timing that corresponds to this weft flying state. be able to. This is a fluid extinguisher
m, and does not lead to an increase in weft insertion troubles.

(Example) Hereinafter, an example in which the present invention is embodied in a jet loom equipped with a weft length measurement and storage device of a winding length measurement and storage type will be described with reference to the drawings.

As shown in FIG. 1, a weft guide path S is formed in the front of the reed 2 that is installed upright on the slay 1, and the weft Y that has passed through the weft length measuring and storage device is passed from the main nozzle 3 for weft insertion. The weft is inserted into the weft guide path S. The weft insertion main nozzle 3 is connected to a compressed air supply tank 23 via an electromagnetic valve 22. There is a mounting groove 1a on the front of Slay 1.
is formed in the groove 1a, and a plurality of support blocks 4 (16 in this embodiment, but 6 (flit
(only shown) are tightened and fixed at predetermined intervals so that the mounting position can be adjusted. Each block 4 has an auxiliary nozzle 5A,
5B, 6A, 6B, ? A, 7B, 8A.

8B, 9A, 9B, IOA, 10B, IIA, 11
B, 12A, 12B are vertically supported, and each of these auxiliary nozzles 5A to 12B is connected to a solenoid valve 13° 14.15,
It is connected to the compressed air supply tank 21 via 16.17.1B and 19.20.

Each of the auxiliary nozzles 5A to 12B is connected to one electromagnetic valve in adjacent pairs in order from the side of the main weft insertion nozzle 3.

A support block 24 is tightened and fixed to the mounting groove 1a corresponding to the outer side of the pair of auxiliary nozzle groups 12 near the ends of the weave width, so that the mounting position can be adjusted. Support body 25A.

25B is strongly supported. Both supports 25A.

The tip of the support 25B has reached the vicinity of the weft guide path S, and the tip of one support 25A has a light projecting element (path shown) embedded therein, and the tip of the other support 25B has a light receiving element ( (Illustrated road) is buried. That is, the pair of supports 25A and 25B constitute a weft yarn detector 25, which detects the weft yarn Y flying in the weft guide path S.

As shown in FIG. 1.2, the weft detection signal output from the weft detector 25 is input to the control device C. Control device C
is the input/output interface and the central processing unit CPU
and a memory for storing the initial opening/closing timings of the electromagnetic valves 13 to 20, 22 input and set in advance by the injection timing setter 26, and these initial opening/closing timings are set according to the set weft jump shown in FIG. It is set based on the input of the run start angle α and the set weft run end angle β. The initial opening/closing timing of each electromagnetic valve 13 to 20.22 is shown in block Tl in FIG.

T2. T3. T4. T5. T6. T7. T8. It is indicated by To. In addition, the control device C stores opening/closing timings corresponding to a large number of weft flying curves obtained from past weft flying data, and stores one weft flying curve and the opening/closing timing corresponding to the same curve. Di and T11.
Ti2. Ti3゜Ti4. Ti5. Ti6. Ti7. T
Shown as i8.

Now, the control device C controls the opening and closing timing of the electromagnetic valves 13 to 20 according to the control block diagram shown in FIG.
This control action will be explained below.

As the loom starts, the control device C adjusts the initial opening/closing timing T.
1-T8. The TO commands the operation of the electromagnetic valves 13 to 20.22, and the electromagnetic valves 13 to 20.22 are activated at initial opening/closing timings T1 to T8. It is opened and closed by TO. As a result, the weft yarn Y is ejected from the weft insertion main nozzle 3 and pulled by the auxiliary nozzle groups 5 to 12 that carry out relay injection. As such weft insertion is performed, the control device C detects the weft tip based on the machine rotation angle detection signal from the rotary encoder 27 for detecting the machine rotation angle and the weft tip detection signal from the weft detector 25. The arrival time θ(Di) is calculated and stored in the memory. Then, in the central processing unit CPU, a predetermined number n of weft tip arrival timing data θ(Di)
Calculate the mean value μ and standard deviation value λ of the population consisting of
These calculated values μ and λ are stored in the memory. continue,
The control device C determines whether the calculated average value μ satisfies the following inequality.

β−Δμμμβ×Δ Note that Δ is a constant.

If μ satisfies the above inequality, the control device C continues to control the operation of the electromagnetic valves 13 to 20 at the initial opening/closing timings T1 to T8. If the average value μ does not satisfy the above inequality, the control device C selects the opening/closing timings T1 to T8 corresponding to the weft tip arrival time μ, therefore, the weft flight curve Di, and operates the electromagnetic valve at the opening/closing timings T1 to T8. 13 to 20 are controlled.

The control value ZC is the new weft tip arrival timing data θ (Dk)
The above calculation and judgment are performed for each input of , but in this process, new weft tip arrival time data θ(Dk
) is added, and a new mean value σ and standard deviation value δ
are calculated and set. Then, it is calculated whether the average value σ satisfies the following inequality.

μ−g+1λ×σ×μ0g−λ Note that g in the inequality is a constant.

If σ satisfies the above inequality, the control device C continues to control the operation of the electromagnetic valves 13 to 20 at the opening and closing timings Tit to Ti8. The average value σ is.

If the above inequality is not satisfied, the control device C selects the opening/closing timing corresponding to the weft tip arrival time σ, and controls the operation of the electromagnetic valves 13 to 20 using this opening/closing timing.

In this embodiment, the opening/closing timing of the electromagnetic valves 13 to 20 is changed during operation of the loom in accordance with the actual time when the weft reaches the tip. Therefore, it is possible to select appropriate injection timings, thereby making it possible to reduce the injection width in each of the auxiliary nozzle groups 5 to 12. Therefore, by performing weft insertion while keeping the initial opening/closing timing fixed, it is possible to significantly reduce fluid consumption without causing an increase in weft insertion troubles compared to the conventional method. Auxiliary nozzle group 5-12
The weft detector 25 installed near the end of the weave width is the only weft detector that obtains the weft tip position information for selecting the injection timing at the end of the weave width. This is because there is a nearly constant correlation with the travel curve. Therefore, if we know when the weft tip reaches the end of the weaving width, we can identify the weft flight curve that reaches this time from past weft flight data, and select a group of auxiliary nozzles that corresponds to the identified weft flight curve. Injection timings 5 to 12 can also be extracted from past data.

The present invention is of course not limited to the above-mentioned embodiments; for example, in the above-mentioned embodiments, only the injection timing of the auxiliary nozzle is changed, but it is also possible to change the injection timing of the main nozzle for weft insertion. good. In addition, comparing the weft tip arrival time measured in one weft insertion with the weft tip arrival time measured in the next weft insertion,
If this difference is greater than the set interval, the injection timing corresponding to the weft tip arrival time in the latter weft insertion may be adopted for subsequent weft insertion, or the weft tip arrival timing obtained from past weft flight data may be used as a variable. (the same number of equations as the set number of opening/closing timings of electromagnetic valves) is input into the control device, and the injection timing is calculated from the above equation based on the actual weft tip arrival data grasped by the control device. It is also possible to apply the present invention to a jet loom of a sanitizing type consisting of a combination of a weft guide member and an auxiliary nozzle, or a jet loom equipped with a weft length measuring and storage device of an air bubble type.

Furthermore, the present invention can be applied to so-called multicolor weft insertion in which different types of weft yarns are inserted, and in this case, it is preferable to perform calculations for changing the injection timing for each type of weft yarn.

Effects of the Invention As detailed above, in the present invention, the subsequent injection timing is changed in accordance with the actual weft flying condition, so fluid consumption can be reduced without increasing weft insertion troubles. It has the excellent effect of being able to significantly reduce the amount of water.

[Brief explanation of drawings]

Figure 1 is a perspective view showing an embodiment embodying the present invention, Figure 2 is a block diagram, Figure 3 is a graph showing a weft flight curve, and Figure 4 is a control block diagram. Auxiliary nozzles 5A, 5B, 6A, 6B, TA, 7B, 8A
, 8B, 9A, 9B, IOA, IOB. 11A, IIB, 12A, 12B, solenoid valve 13.1
4, 15, 16, 17. 18, 19, 20, weft detector 25, control device C, cotton weft.

Claims (1)

[Claims] 1. A weft detector for detecting the tip of the weft yarn which is guided by the jetting fluid inside the warp shedding is placed near the end of the weave width, and the tip of the weft yarn inserted is detected at a preset injection timing. An injection timing adapted to the weft tip position information from the weft detector is selected or calculated, and if the selected or calculated injection timing is different from the set injection timing, the set injection timing is changed to the calculated or selected injection timing. Weft insertion method in jet loom that corrects timing.