JPH0214047A - Method for controlling weft-insertion - Google Patents

Abstract

PURPOSE:To stably control the weft-insertion taking consideration of the physical properties of the weft by calculating the deviation between the actual insertion angle and the target insertion angle of a weft, calculating the correction value of a main nozzle ejection angle from the deviation using a specific formula and controlling the starting and ending timing of ejection. CONSTITUTION:The correction value of the ejection angle of a main nozzle is calculated by the following formula using the deviation calculated by the difference between the actual insertion angle measured at the destination side of the weft and the target insertion angle, theta=(KmXalphaXM)+(knXbetaXN) wherein theta is deviation; Km and kn are variation of the actual insertion angle of the weft relative to the variation of the ejection starting angle of the main nozzle and the ratio of the variation of the weft insertion angle to the variation of the ejection ending angle; alpha and beta are correction unit angle at the start and the end of ejection; M and N are correction values (integers) at the start and the end of ejection. The weft insertion is controlled based on the correction value of the main nozzle ejection angle calculated by the above formula.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a weft inserting device for a fluid jet loom, and more particularly to a method for controlling the actual arrival angle of the weft yarn to a target arrival angle.

The prior art invention disclosed in Japanese Utility Model Application Publication No. 62-166284 controls the arrival angle of the weft yarn to be always constant by controlling the weft insertion start angle, that is, the injection start angle of the main nozzle to tFRwi.

However, in the control process, the amount of variation in the arrival angle of the weft yarn is increased from 3 degrees to 5 degrees in rotation angle for a correction amount of the weft insertion start angle, for example, 2 degrees in rotation angle.

This phenomenon is thought to be because the timing at which the weft yarn starts flying changes, which causes the jet relay of the sub-nozzle group to become unbalanced with respect to the weft yarn flight, resulting in a change in the flying speed.

Due to this phenomenon, the above-mentioned conventional technology has the following drawbacks.

First of all, it is not possible to stably follow minute fluctuations in the arrival angle of the weft thread, and control characteristics tend to become unstable during the control process.

Secondly, in order to achieve highly accurate response characteristics, an encoder with a small minimum resolution is required in order to further reduce the minimum correction amount of the injection start angle, making the control device expensive.

Furthermore, thirdly, as mentioned above, the arrival angle of the weft thread expands and changes in response to changes in the amount of operation during control, making the control unstable, resulting in unstable weft flight characteristics and weft insertion errors. This is a situation where this is likely to occur.

On the other hand, in a series of control processes, if the correction amount of the weft starting angle becomes large, the synchronization between the weft thread flight and the warp thread shedding will be disrupted, which will adversely affect the weaving synchronization state such as weft thread loosening and warp thread hooking. . Such adverse effects can be overcome to some extent by controlling the lateral insertion end angle, that is, the injection end angle of the main nozzle. According to II #H of the injection end angle, the actual arrival angle of the weft thread does not appear enlarged as in the control of the injection start angle described above.
Rather, the actual arrival angle appears to be reduced to about 1" for a correction angle of 2°. However, as weaving progresses, the winding diameter of the yarn feeder decreases, and the physical characteristics of the weft greatly change. As a result, the amount of variation in the actual arrival angle eventually becomes large, and the amount of variation cannot be dealt with only by correcting the injection end angle of the wefting fluid.

OBJECTS OF THE INVENTION Accordingly, an object of the present invention is to bring the actual arrival angle of the weft closer to a target value while stably maintaining the control characteristics of the control system and the flight characteristics of the weft.

Solution to the Invention In view of the above-mentioned object, the present invention provides a method for adjusting the jetting start angle of the main nozzle in order to make the arrival timing, that is, the arrival angle of the weft constant, in the process of inserting the weft into the warp opening by fluid jetting. Control is performed in combination with the injection end angle, eliminating the drawbacks of controlling only one of them. Further, in the present invention, the degree of influence of the jetting start angle and the jetting end angle of the weft inserting fluid on the actual arrival angle of the weft yarn is determined respectively, and the target arrival angle and the actual arrival angle are determined by taking these influences into consideration. A correction amount for the angle deviation amount is determined.

According to this kind of control, compared to control based only on the injection start angle of the wefting fluid or control based only on the injection end angle, the respective disadvantages can be overcome, and the correction amount for the injection start angle and injection end angle can be eliminated. By this distribution, optimal control can be achieved that is compatible with the physical properties of the weft yarn and the actual flying characteristics of the weft yarn.

Structure of the Invention First, FIG.
The configuration of the device 10 is shown.

This weft inserting device 1 takes in a weft inserting fluid 3 from a pressure fluid a2 via an on/off control valve 8, and injects it from a main nozzle 4 at the weft inserting timing, thereby drawing out a weft yarn 6 from a yarn supplying body 5. It is placed in a vertical unopened lower lower space along with a fluid 3 for filling.

On the other hand, the control device 10 controls the on-off control valve 8, and the arrival sensor 1) is located on the arrival side of the weft thread 6.
The actual arrival timing of the weft thread 6 is measured by the angle detector 12, the arrival timing is converted into the rotation angle of the main shaft 13 by the angle detector 12, the actual arrival angle θ at the time of weft insertion is detected, and this is sent to the comparator 14. I'm here. Comparator 14
calculates the deviation amount Δθ from the difference between the target arrival angle e of the target setting device 15 and the actual arrival angle θ, and calculates this deviation amount Δθ from the controller 16.
send to.

Here, the controller 16 executes the weft insertion control program of the present invention at regular intervals or every predetermined number of picks,
Correction for the deviation amount Δθ is set based on the following correction formula.

Δθ= (KmxzxM)+ (KnxI9xN)Δθ
: Deviation amount Km, Kn: Distribution coefficient o: : Correction unit angle of injection start angle β: Correction unit angle β of injection end angle M: Correction value of injection start angle (adjustment value N: Correction value of injection end angle ( Light adjustment α×M: correction amount of injection start angle β×N2 correction amount of injection end angle With respect to the injection period, the actual arrival angle θ of the weft thread 6 changes by 4 degrees as the injection start angle 2 changes, and the actual arrival angle θ changes by 18 as the injection end angle changes 2 degrees. If you did,
The sixth correction above should be set as shown below.

Δθ=2X2"XM+ (1/2)X2° It is determined.

Although the distribution coefficients Km and Kn are determined in advance at the stage of trial weaving, they may be determined each time during actual control during weaving.

[Here, the correction value M of the injection start angle (k) and the correction value N of the injection end angle corresponding to the deviation amount Δθ are calculated by taking into account the physical coefficient of the weft thread 6k) and the actual flying characteristics of the weft thread 6. , predetermined by the input setter 17,
It is stored in the memory of the controller 16 (.

Figure 2 shows multiple deviations IΔθ=-4°, 3°, '1
The graph shows changes in the correction value M of the injection start angle and the correction value N of the injection end angle with respect to 0°. The graph of the deviation amount Δθ is expressed as a straight line graph, but depending on the absolute value of the deviation amount Δθ and changes in the positive or negative sign, the first, second, and third quadrants are Or pass through the fourth quadrant.

Therefore, the injection start angle ° corresponding to the deviation amount Δθ
The correction value M of the weft yarn 6 and the correction value N of the injection end angle can be arbitrarily determined on the straight line of the graph, but in order to achieve more appropriate control, it is necessary to Considering the actual flying characteristics of the weft thread 6,
Determine the range of the quadrant where horizontal insertion errors are unlikely to occur, and set an appropriate value within that range.

FIG. 3 shows an example of controlling the injection start angle and the injection end angle at the same time.

In (1) of the same figure, the actual arrival angle θ is the target arrival angle θ.
This is an example in which the injection start angle is made later and the injection end angle is made earlier than the standard injection angle, and this corresponds to the fourth quadrant in the graph of FIG. 2. This control is advantageous in that the timing of inserting the weft thread does not become too late. Furthermore, since both the injection start angle and the end angle are corrected in the direction of shortening the injection period, it is possible to significantly correct the arrival angle.

Next, in (2) of the same figure, when the actual arrival angle θ is earlier than the target arrival angle e, both the injection start angle and the end angle are set later than the standard injection start angle and end angle. This example corresponds to the first quadrant of the graph. In this case, the amount of correction for the injection start angle is slightly larger than that in the first control example, but the horizontal adjustment is necessary to delay the injection end angle. It is advantageous in that it is stable and is less prone to venting and chipping troubles.

Moreover, (3) and (4) of the same figure have shown the case where the actual arrival angle (theta) of the weft thread 6 became later than the target arrival angle (theta). In (3) of the same figure, the arrival timing is optimized within the second quadrant of the graph by setting the injection start angle earlier and the injection end angle later. This control is advantageous in that warp yarns are less likely to get caught. Furthermore, since the amount of correction for the injection period can be made smaller than in the control example described later, it is effective for controlling yarns that tend to break easily. Further, (4) in the same figure is an example of optimizing the arrival timing of the weft thread within the third quadrant of the graph by advancing both the injection start angle and the injection end angle on the time axis.

In this case, the injection period can be increased by correction, so that the flight of the weft yarn can be made more stable.

In the above embodiment, the correction value M of the injection start angle and the correction value N of the injection end angle are set in advance for the deviation amount of the arrival angle of the weft yarn. A correction value may be calculated within the controller 16.

Other Embodiments of the Invention In the embodiments described above, the injection start angle and the injection end angle are controlled simultaneously, but these do not necessarily have to be controlled simultaneously. For example, when the actual arrival angle θ changes with respect to the target arrival angle e as shown in Fig. 4, first,
Only the injection end angle is controlled within the limit amount, and when the actual arrival angle θ cannot be corrected to the target arrival angle θ even with this, the injection start angle is adjusted by one step corresponding to the limit amount of the injection end angle. The injection end angle may be replaced by changing the amount, and after the change, the injection end angle may be controlled again within the range of the limit amount.

Such a control mode is advantageous in stabilizing the control by not changing the injection start angle as much as possible, and in making the control follow accurately in a minute range by correcting the injection end angle.

Effects of the Invention In the present invention, the injection start timing and injection end timing can be controlled simultaneously, and each correction amount is appropriately distributed, so the response to the correction amount is proportional, and highly accurate control can be achieved. .

In addition, when changing the injection start angle and end angle, the correction amount of the injection start angle and the correction amount of the injection end angle are divided proportionally to an appropriate state, taking into account the physical characteristics of the weft yarn and the actual flying characteristics of the weft yarn. Therefore, stable control can be achieved that takes into consideration the physical characteristics and flying characteristics of the weft yarn.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the weft inserting device and the weft inserting control device, FIG. 2 is a graph of the amount of deviation, FIG. 3 is an explanatory diagram of the control mode, and FIG. 4 is an explanatory diagram of the correction mode. 1. Horizontal insertion device, 2. Pressure fluid source, 3. Fluid,
4. Main nozzle, 5. Yarn feeder, 6. Weft, 7
...Vertical unopened, 10..Control device, 1)..Achievement sensor, 12..Angle detector, 13..Main axis, 14..Comparator, 15..Target setter, 16..Controller. , 17...
Input setting device. , Patent Applicant Tsudakoma Kogyo Co., Ltd. Representative Patent Attorney Kunio Nakagawa Figure 7 Figure 2

Claims (2)

[Claims] (1) In a weft insertion device that inserts the weft yarn into the warp opening by jetting weft insertion fluid from the main nozzle, measure the actual arrival angle on the arrival side of the weft yarn,
A horizontal insertion control method characterized in that the amount of deviation is determined from the difference between the actual arrival angle and the target arrival angle, and the amount of correction of the injection angle of the main nozzle relative to this amount of deviation is set based on the following correction formula. . Δθ = (Km × α × M) + (Kn × β × N) Δθ: deviation amount Km, Kn: distribution coefficient α: correction unit angle of injection start angle β: correction unit angle of injection end angle M: injection start angle Correction value for (integer) N: Correction value for injection end angle (integer) (2) The above distribution coefficients Km and Kn are set as the ratio of the amount of change in the actual weft arrival angle to the amount of change in the injection start angle of the main nozzle, and the amount of change in the weft yarn arrival angle to the amount of change in the injection end angle, respectively. A weft insertion control method according to claim 1, characterized in that: