JP2808117B2 - Horizontal insertion control method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a weft insertion device for a fluid jet loom, and more particularly to a method for controlling an actual weft arrival angle to a target arrival angle.

[Conventional technology]

In the invention of Japanese Utility Model Application Laid-Open No. Sho 62-166284, the weft insertion angle, that is, the injection start angle of the main nozzle is adjusted to control the weft arrival angle to be always constant.

However, in the control process, the amount of change in the weft arrival angle with respect to the correction amount of the weft insertion start angle, for example, the rotation angle of 2 °, is expanded from 3 ° to 5 ° in rotation angle. It is considered that such a phenomenon is caused by the fact that the timing of the start of the weft flight changes, the balance of the ejection relays of the sub-nozzle group against the flight of the weft yarn breaks, and the flight speed changes.

Due to such a phenomenon, the above-described conventional technology has the following disadvantages.

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

Second, in order to achieve high-precision response characteristics, an encoder having a small minimum resolution is required in order to make the minimum correction amount of the injection start angle smaller, and the control device becomes expensive.

Third, as described above, in response to a change in the operation amount during the control, the arrival angle of the weft yarn is enlarged and changed, and the control is not stable. Therefore, the flight characteristics of the weft yarn are not stable, and a weft insertion error occurs. The situation is likely to occur.

On the other hand, in a series of control processes, if the correction amount of the weft insertion start angle becomes large, the synchronous state between the weft flight and the opening of the warp yarn breaks down, which has an adverse effect on the synchronous state of weaving such as looseness of the weft yarn and hooking of the warp yarn. . Such an adverse effect can be solved to some extent by controlling the weft insertion end angle, that is, the injection end angle of the main nozzle. According to the control of the injection end angle, the actual arrival angle of the weft yarn does not appear to expand as in the control of the injection start angle described above, but rather, the actual arrival angle is about 1 ° with respect to the correction angle 2 °. Appearing to shrink. However, in the process of reducing the winding diameter of the yarn supplying body with the progress of weaving, the physical characteristics of the weft yarn change significantly, so that the actual amount of variation in the arrival angle eventually increases, and the injection of the weft-filling fluid ends. Only the correction of the angle cannot cope with the variation.

[Object of the invention]

Therefore, an object of the present invention is to make the actual arrival angle of the weft close to the target value while maintaining the control characteristics of the control system and the flight characteristics of the weft stably.

[Solution of the Invention]

In order to stabilize the weft arrival timing, that is, the arrival angle of the weft in the process of inserting the weft into the warp opening by the fluid ejection, the present invention provides an ejection start angle and an ejection end angle of the main nozzle. Are combined to eliminate the disadvantage of only one of the controls. In particular, according to the present invention, the influences of the injection start angle and the injection end angle of the weft filling fluid with respect to the actual arrival angle of the weft yarn are determined in advance, and the target arrival angle and the actual arrival angle are considered in consideration of these influence degrees. The distribution ratio of the correction amount of the injection start angle and the correction amount of the injection end angle with respect to the angle deviation amount is determined.

According to such control, as compared with control using only the injection start angle of the weft-filling fluid or control using only the injection end angle, those disadvantages can be eliminated, and the correction amount for the injection start angle and the injection end angle can be corrected. Optimum control suitable for the physical characteristics of the weft yarn and the actual flight characteristics of the weft yarn can be realized.

〔Example〕

First, FIG. 1 shows a configuration of the control device 10 in relation to the weft insertion device 1.

The weft insertion device 1 takes in the weft insertion fluid 3 from the pressure fluid source 2 via the on / off control valve 8 and injects the weft yarn 6 from the yarn supplying body 5 by injecting the weft yarn 3 at the weft insertion timing. And it is wedged into the warp opening 7 together with the wefting fluid 3.

On the other hand, the control device 10 controls the on / off control valve 8, measures the actual arrival timing of the weft yarn 6 by the arrival sensor 11 on the arrival side of the weft yarn 6, and determines the arrival timing by the angle detector 12. Convert to 13 rotation angles, detect the actual arrival angle θ at the time of weft insertion,
This is sent to the comparator 14. The comparator 14 obtains a deviation amount Δθ from the difference (Θ−θ) between the target arrival angle Θ of the target setting unit 15 and the actual arrival angle θ, and sends the deviation amount Δθ to the controller 16.

Here, the controller 16 executes the weft insertion control program of the present invention at regular intervals or at a predetermined number of picks,
The correction amount (α × M) of the injection start angle with respect to the deviation amount Δθ and the injection amount (β × N) of the injection end angle are set based on the following correction formula.

Δθ = (Km × α × M) + (Kn × β × N) Km, Kn: Distribution coefficient (Km ≠ 0, Kn ≠ 0) α: Injection start angle correction unit angle (α ≠ 0) β: Injection end Angle correction unit angle (β ≠ 0) M: Injection start angle correction value N: Injection end angle correction value (α × M): Injection start angle correction amount (integer) (β × N): Injection end angle Correction amount (integer) For example, the correction unit angles α and β of the injection start angle and the injection end angle are both 2 °. Weft thread 6
The actual arrival angle θ changes by 4 °, and the injection end angle 2
Assuming that the actual arrival angle θ changes by 1 ° with respect to the change of ゜, the above correction formula is set as follows.

.DELTA..theta. = 2.times.2.times.M.times. (1/2) .times.2.times..times.N That is, the distribution coefficients Km and Kn are the correction amount of the injection start angle of the main nozzle (.alpha..times.M) and the correction amount of the injection end angle (.alpha.M). β × N), which is determined by the ratio of the respective amounts of change of the actual arrival angle θ of the weft yarn 6, that is, the degree of influence.

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

Here, the correction value M of the injection start angle and the correction value N of the injection end angle corresponding to the deviation amount Δθ are within the range of the controllable weft insertion angle, and the physical coefficient of the weft yarn 6 and the actual flight of the weft yarn 6 are controlled. Considering the running characteristics, etc.
Thus, it is stored in the memory of the controller 16.

FIG. 2 is a graph showing changes in the correction value M of the injection start angle and the correction value N of the injection end angle for a plurality of deviation amounts Δθ = -4 °, 3 °, and 10 °. Deviation Δθ
Is represented as a straight line graph, but passes through the first quadrant, the second quadrant, the third quadrant, or the fourth quadrant depending on the absolute value of the deviation amount Δθ and a change in the positive or negative sign.

Therefore, the correction value M of the injection start angle and the correction value N of the injection end angle corresponding to the deviation amount Δθ can be arbitrarily determined on a straight line, but the control response speed is increased,
In order to improve the control efficiency, when the deviation amount Δθ ≧ 0, M
When ≧ 0, the first or second quadrant is specified. When the deviation amount Δθ <0, M <0, and the second or third quadrant is specified. After determining the correction value M of the injection start angle, the correction value N of the injection end angle is then determined on a straight line graph.

Of course, the correction values M and N are determined in consideration of the type of the weft yarn 6, that is, the physical characteristics of the weft yarn 6 and the actual flight characteristics of the weft yarn 6 in order to realize more appropriate control. The range of the controllable weft insertion angle that is less likely to cause misplacement is determined, and an appropriate value is set within the range.

FIG. 3 shows an example in which the injection start angle and the injection end angle are controlled simultaneously.

(1) in FIG. 3 indicates a case where the deviation amount Δθ ≧ 0, that is,
When the actual arrival angle θ is earlier than the target arrival angle Θ, the injection start angle is made slower and the injection end angle is made earlier than the standard injection angle. It corresponds to four quadrants. This control is advantageous in that the weft insertion time is not too late. Also,
Since both the injection start angle and the injection end angle are corrected in the direction of shortening the injection period, it is possible to significantly correct the arrival angle.

Next, (2) of FIG. 3 shows that when the deviation amount Δθ ≧ 0, that is, when the actual arrival angle θ is earlier than the target arrival angle Θ, the injection start angle and the injection end angle are changed. Both examples are set later than the standard injection start angle and end angle, and correspond to the first quadrant of the graph. In this case, the correction amount of the injection start angle is slightly larger than that in the first control example, but the injection end angle is delayed, so that the weft insertion is stable, and there is an advantage in that the occurrence of vent topics and chip troubles is less likely to occur. It is.

FIG. 3 (3) shows the case where the deviation amount Δθ <0, that is, the actual arrival angle θ of the weft yarn 6 is equal to the target arrival angle Θ.
In this example, the injection start angle is set earlier and the injection end angle is set later to optimize the arrival timing in the second quadrant of the graph. This control is advantageous in that warp cling is unlikely to occur. Further, since the correction amount of the injection period can be reduced as compared with the control example described later, it is effective for control of a yarn having a property of easily blowing out.

Further, (4) in FIG. 3 shows that when the deviation amount Δθ <0,
That is, in the example where the actual arrival angle θ of the weft yarn 6 is later than the actual arrival angle Θ, the injection start angle and the injection end angle are both advanced on the time axis, so that in the third quadrant of the graph, This is an example of optimizing the weft arrival timing. In this case, the injection period can be made longer by the correction, so that the flight of the weft yarn can be further stabilized.

In the above-described embodiment, the correction value M of the injection end angle and the correction value N of the injection end angle with respect to the deviation amount Δθ of the weft arrival angle are set in advance.
However, an appropriate correction value may be calculated in the controller 16.

[Other embodiments]

In the above embodiment, the injection start angle and the injection end angle are controlled at the same time. However, these are not necessarily controlled at the same time, and may be executed with the control timing shifted. For example, when the actual arrival angle θ changes as shown in FIG. 4 with respect to the target arrival angle Θ, first, only the injection end angle is controlled within a controllable weft insertion angle range. When the reaching angle θ cannot be completely corrected to the target reaching angle Θ, the injection start angle is set to 1 corresponding to the limited amount of the injection end angle.
The replacement may be performed by changing the step amount, and after the change, the injection end angle may be sequentially controlled again within the limit amount range. Such a control mode is advantageous when the injection start angle is not changed as much as possible to stabilize the control, and when the injection end angle is corrected, the control can be accurately followed in a fine range.

〔The invention's effect〕

In the present invention, the injection start timing and the injection end timing can be simultaneously controlled, and the respective correction amounts are appropriately distributed. Therefore, the response to the correction amount is proportional, and high-precision control can be realized.

In addition, when changing the injection start angle and the injection end angle, the correction amount of the injection start angle and the correction amount of the injection end angle are adjusted to an appropriate state in consideration of the physical characteristics of the weft yarn and the actual flight characteristics of the weft yarn. Because of the proportional distribution, stable control can be realized in consideration of the physical characteristics and flight characteristics of the weft yarn.

[Brief description of the drawings]

1 is a block diagram of a weft insertion device and a weft insertion control device, FIG. 2 is a graph of a deviation amount, FIG. 3 is an explanatory diagram of a control mode, and FIG. 4 is an explanatory diagram of a correction mode. 1 ... weft insertion device, 2 ... pressure fluid source, 3 ... fluid,
4 ... main nozzle, 5 ... yarn feeder, 6 ... weft, 7
... warp opening, 10 ... control device, 11 ... arrival sensor, 12 ... angle detector, 13 ... spindle, 14 ... comparator, 15
…… Target setter, 16… Controller, 17 …… Input setter.

Claims (2)

(57) [Claims] 1. A weft insertion device for inserting a weft yarn into a warp yarn opening by jetting a weft insertion fluid from a main nozzle, wherein an actual arrival angle θ of the weft yarn is measured on a weft yarn arrival side,
The difference between the actual arrival angle θ and the target arrival angle Θ (Θ−
θ), a correction amount α × M of the injection start angle of the main nozzle and a correction amount β × N of the injection end angle of the main nozzle with respect to the deviation amount Δθ are calculated based on the following correction formula. When ≧ 0, the injection start angle correction value M is a positive number, when the deviation Δθ <0, the injection start angle correction value M is a negative number, and the injection start angle correction value M is the injection end angle correction. After setting prior to the value N, the correction amount (α
× M) and (β × N), by setting the weft insertion start angle and the weft end angle within a controllable weft insertion angle range, the actual weft yarn arrival angle θ
よ approaching the target arrival angle Θ. Δθ = (Km × α × M) + (Kn × β × N) Km, Kn: Distribution coefficient (Km ≠ 0, Kn ≠ 0) α: Injection start angle correction unit angle (α ≠ 0) β: Injection end Angle correction unit angle (β ≠ 0) M: Injection start angle correction value N: Injection end angle correction value 2. The distribution coefficients Km and Kn are respectively set as the ratio of the change amount of the weft arrival angle to the change amount of the injection start angle of the main nozzle and the change amount of the weft arrival angle to the change amount of the injection end angle. 3. The method according to claim 1, further comprising the step of: