JPH01192851A - Weaving method with water-jet loom - Google Patents

Abstract

PURPOSE:To increase the operating properties of the loom, by detecting the position and/or change in the tension of the weft in the weft trap at the weft flying to control the weft-inserting conditions so that weft-change timing performs good weft flying. CONSTITUTION:A photoelectric sensor B is set on the path on which the weft 5 runs from the weft length-measuring roller 1 to the guide 6 to detect the timing when the weft 5 is tight-stretched, or a piezoelectric sensor A is set to the guide 6 to detect the shocks whereby the position or tension change of the weft 5 is detected at the weft trap 2b. Thus, the weft-inserting conditions are controlled so that the timing enables good weft flying.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water jet loom weaving method. More specifically, the present invention relates to a water jet loom weaving method in which weaving is performed by adjusting the weft insertion conditions so as to give the weft a good flying condition.

[Prior Art and Problems to be Solved by the Invention] If the weft threads inserted in the water jet loom do not fly appropriately over the entire woven width, the loom will stop due to poor weft insertion. Therefore, we grasped the weft flying condition during weft insertion,
The weft insertion conditions are appropriately adjusted, but conventionally,
The method used for diagnosing the weft flying condition of water jet looms is that a maintenance engineer or the like visually observes the weft flying condition using a stroboscope synchronized with the timing signal sent from the loom and determines whether it is good or bad. A common method is to evaluate. In other words, by measuring the relative positional relationship between the weft tip and the jet tip, the degree of deflection of the weft tip, or the reached position of the weft tip at any given time using a strophoscope, we can comprehensively measure these. The weft flying condition was diagnosed by evaluation or independent evaluation. However, these methods require the measurer to have a high level of skill, and are also dependent on the subjectivity of the measurer, and in the end they often rely on the measurer's experience and intuition.

Furthermore, in the above method, it is necessary for the measurer to carry the heloboscope every ms and irradiate the flying weft with a strobe light to measure it, which is not only slow but also complicated. There is a problem with this.

Under these circumstances, the diagnosis of the weft flying state has not been completely carried out in fact, and as a result, the weft insertion conditions are set empirically. Furthermore, the diagnosed looms also lacked accuracy, causing a decline in loom operability.

In order to solve these problems, several new methods have been proposed in recent years.

For example, as shown in FIG. 7, a weft tension detector C is provided between the weft gripper 3 and the injection nozzle 4, and the tension behavior of the flying weft is detected one by one, thereby forming a weft tension waveform. Therefore, methods for diagnosing the flying condition of weft threads have been considered. However, in this method, a weft tension detector is newly installed between the weft gripper and the fluid injection nozzle, and it is necessary to make the weft fly in contact with this detector. becomes a resistance when the weft yarn flies, and the installation of the detector itself becomes a factor that makes the weft flight property unstable. For this reason, it is considered inappropriate to actually use the above method.

As described above, an accurate, quick, and quantitative method for diagnosing the condition of weft yarn flying without causing weaving troubles has not been established, and it is still difficult to diagnose the condition of weft yarn flying based on the experience of maintenance workers. As a result, proper weft insertion conditions are not set, resulting in a decrease in loom operability.

Therefore, the present invention solves the above-mentioned problems of the conventional method for diagnosing the weft flying state in a water jet loom, and allows for easy and quick quantitative determination without causing any other weaving troubles. An object of the present invention is to provide a water jet loom weaving method that can improve the operability of a loom by weaving while always giving a good flying condition to the weft by using a method for diagnosing the flying condition of the weft yarn. .

[Means to solve the problem]

The object of the present invention is to detect the change in the posture and/or tension of the weft yarn in the weft storage section of the loom that occurs when the weft yarn flies, and to obtain the loom timing at which the change occurs (hereinafter referred to as weft change timing); Achieved by a water jet loom weaving method characterized in that weaving is performed by adjusting weft insertion conditions so that the weft change timing is such that a good flying condition can be given to the weft yarn. be done.

Here, first, an example of weft behavior in the weft storage section will be described with reference to the accompanying drawings.

FIG. 3 shows a model of the weft behavior in the weft storage section regarding the pool pipe type weft storage device.

FIG. 3(a) shows a state in which the weft gripper 3 of the loom is closed and the weft fed from the length measuring roller 1 is stored in the pool pipe (weft storage section) 2a.

FIG. 3(b) shows that a jet is injected from the jet nozzle 4, then the weft gripper 3 is opened, and the weft stored in the pool pipe 2a is pulled out from the pool pipe and freed depending on the speed of the jet. It shows the state of flying towards (
Hereinafter, such a weft flying state will be referred to as "free flying").

FIG. 3(c) shows a state in which all the weft yarns stored in the pool pipe 2a have finished flying (hereinafter, this timing will be referred to as ``restricted flying start timing''). At this time, the weft thread gripper is in an open state, and the weft thread continues to fly. However, from this point on, there are no weft yarns stored, and the weft yarns continue to fly because they are not fed from the length measuring roller 1.

That is, from now on, the weft continues to fly depending on the weft feed speed of the measuring roller 1 (hereinafter, such a flying state is called restrained flying, and the weft flying speed at this time is theoretically teeth,
It is equal to the weft feed speed of length measuring roller 1. ).

FIG. 3(d) shows that the weft gripper 3 is closed and the weft is held in the fabric 11.
This shows a state in which the weft yarn has completed its flight, and from this point forward, the weft yarn is stored in the pool pipe 2a until the weft gripper 3 is released.

Next, FIG. 4 shows the rotating drum type weft storage device.
This is a model-like representation of the weft behavior in the weft storage section, and will be similarly explained below.

FIG. 4(a) shows a state in which the weft yarn is stored in the rotating drum 2b, and the weft yarn gripper 3 is closed as in FIG. 3(a).

FIG. 4(b) shows a state in which a jet is jetted from the jet nozzle 4, the weft gripper 3 is opened, and the weft stored on the rotating drum 2b is unwound and flying freely. It shows.

Moreover, FIG. 4(C) shows a state in which all the weft yarns stored on the rotating drum 2b have stopped flying (restricted flight start timing). Continue.

FIG. 4(d) shows a state in which the weft yarn gripper 3 is closed and the weft yarn has completely stopped flying, indicating the timing at which the weft yarn flight has ended.

As can be seen from FIGS. 3 and 4, the weft behavior in the weft storage section can be roughly divided into four patterns for both the pool pipe method and the rotating drum method.

That is, the present inventor found that the weft behavior in the weft storage section changes greatly in this way, and in particular, even at the start timing of restrained flight, which can be a measure for evaluating the quality of the weft flight condition, the weft storage The present invention was achieved by confirming that the weft behavior in the weft section changes significantly.

It is disclosed in Japanese Patent Application Laid-Open No. 62-268847 proposed by the present inventors that the restraint flight start timing is a measure for evaluating the quality of the weft flight condition. That is, in Japanese Patent Application Laid-Open No. 62-268847, it is stated that the quality of the weft flying condition can be evaluated based on the relative relationship between the weft insertion end timing and the restrained flight start timing, and among these, the weft insertion end timing is Since it is determined in advance by the closing timing of the fixing pin for preventing weft yarn unraveling in the weft storage section, which has the same effect as a gripper, the weft flight state is actually determined by the value of the restrained flight start timing. It is said that it is difficult to evaluate whether it is good or bad.

Therefore, further explanation will be given regarding the weft behavior in the weft storage section regarding the restricted flight start timing.

First, in the pool pipe method, as shown in FIG. 3(C), the weft 5 comes into pressure contact with the guide 6 at the timing of starting the restrained flight. More specifically, the weft thread 5 that was running freely runs out of the weft threads stored in the pool pipe 2a and hits the guide 6 in FIG. 3 at a certain speed at the same time as the start of restrained flight, and then, It continues to fly in a restrained manner in pressure contact with the guide 6.

In addition, in the rotary tram system, as shown in FIG.
The section from to guide 6 is straight and tense.

More specifically, the weft 5 stored in the rotating drum 2b
is unwound while rotating in the opposite direction to that when it is stored (during free flight, the weft yarn 5 is wound from the length measuring roller 1 to the rotating drum 2b (see Fig. 4 (b)). )).On the other hand, at the start timing of restrained flight, the weft 5 is
Due to the impact caused by the speed drop, the section from the length measuring roller 1 to the guide 6 in FIG. 4(c) becomes tense, and then moves to restrained flight while remaining in the tense state.

As mentioned above, the weft yarn exhibits a peculiar behavior in the weft storage section at the start timing of the restricted flight (in the pool pipe method, the weft yarn collides with the guide 6 in Fig. 3, and in the rotating drum method, the weft yarn collides with the guide 6 in Fig. 3), , the weft is subjected to an impact and is completely under tension from the length measuring roller 1 to the guide 6 shown in Fig. 4), so by detecting the timing at which these unique weft behaviors occur, Conversely, the timing of the start of restrained flight can be detected easily, quickly, and quantitatively.

In the present invention, the timing of the loom in which the weft exhibits the above-mentioned peculiar behavior in the weft storage section is referred to as the "timing of change in the posture and/or tension of the weft in the weft storage section of the loom when the weft flies". . The timing of the loom is expressed in terms of the loom crank angle, where one revolution of the loom crank is divided into 360 degrees, and is expressed with the time when the reed of the loom is at the frontmost position as a reference (0 degrees).

Next, the accompanying drawings (
This will be explained with reference to FIGS. 1 and 2). FIG. 1 shows a pool pipe system, and FIG. 2 shows a rotating drum system.

In the pool pipe method, a piezoelectric sensor A is provided on the guide 6 in FIG. 1, and this detects the timing when the weft comes into pressure contact with the guide 6, or the weft runs in the weft storage section at the timing of the start of restrained flight. A method can be used in which a photoelectric sensor B is provided in the path to detect changes in weft behavior. In addition, in the rotating drum method, similarly, from length measuring roller 1 in FIG.
It is possible to use a method such as installing a photoelectric sensor B on each of the straight paths up to '6 and detecting the timing when the weft is straightened, or installing a piezoelectric sensor A on the guide 6 and detecting an impact. can.

As described above, by detecting changes in the posture and/or tension of the weft yarn in the weft storage section of the loom using a photoelectric sensor or a piezoelectric sensor installed in the existing guide, weaving can be done without causing any trouble. The weft flying condition can be diagnosed easily, quickly, and quantitatively.

Note that the above-described method of detecting changes in the posture and/or tension of the weft in the weft storage section of the loom is merely an example, and the present invention is not limited to these methods.

The weft change timing is changed by changing the weft insertion conditions. Furthermore, if the weft change timing changes, the flying state of the weft changes. Therefore, when weaving the target fabric, we find the weft change timing that can give the weft a good flying condition, and weave while adjusting the weft insertion conditions to achieve this weft change timing. Good weaving conditions can be maintained at all times, thereby improving loom operability.

〔Example〕

Examples of the method for detecting weft change timing according to the present invention (Example 1.2) and examples of the weaving method according to the present invention using this diagnostic method (Example 3) will be shown below. However, it is clear that the present invention is not limited to these Examples.

Figure 5 shows a model of an embodiment of a pool pipe type weft storage device. Using a guide 6 incorporating a piezoelectric sensor 8, as shown in FIG. 5, the state in which the weft is pressed against the guide 6 is detected and a signal is transmitted. Also, Bo in the figure
x7 takes in a timing signal transmitted from an encoder or the like installed in advance on the loom, and makes it possible to calculate and display the timing at which the signal from the piezoelectric sensor A is transmitted.

FIG. 6 shows, as a model, an embodiment of a rotating drum type weft storage device. A reflective photoelectric sensor B is installed at a position where a detection signal can be transmitted when the weft is under tension during the period from the length measuring roller 1 to the guide 6 shown in FIG.

Also, in Box 7 in the figure, as in the first embodiment, a timing signal transmitted from an encoder etc. installed in advance in machine m is taken in, so that the timing at which the signal from photoelectric sensor B is transmitted can be calculated and displayed.

Personnel base 1 The "timing of change in the attitude and/or tension of the weft in the weft storage section" detected by the method shown in Examples 1 and 2 is the value shown in Table 1 (when the weft is in a good flying state). Weaving was carried out for each example under the weaving conditions shown in Table 2 by adjusting the weft insertion conditions, specifically, mainly the jet injection pressure, so that the weft change timing value was as follows.

In addition, as a comparative example, even when the weft insertion conditions for each weft storage method were determined empirically as before, weaving was carried out in the same way as in the past, and the number of loom stops was measured and evaluated for the example, comparative example, and each. The results obtained are shown in Table 3.

As is clear from Table 1 and Table 3, by weaving using the weaving method using the method for diagnosing the weft flying condition according to the present invention,
It can be seen that a very stable weave is easily obtained.

〔Effect of the invention〕

Since the present invention is configured as described above, by using the weaving method according to the present invention, weaving can be performed while giving the weft a good flying condition, and the operability of the loom can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a method for detecting "timing of change in weft posture and/or tension in the weft storage section" used in the present invention in a pool pipe type weft storage device (I7). , FIG. 2 is a diagram similar to FIG. 1 showing the rotating drum type weft storage device, and FIG. 3 is a diagram similar to FIG.
Regarding the pool pipe type weft storage device, - Figures 3(a) to 3(d) sequentially explain changes in the behavior of weft yarns in the weft storage section during boat fishing; 4(a) to 4(d) are diagrams sequentially explaining changes in the yarn behavior of wefts regarding the rotating drum type weft storage device, and FIG. 1 is a diagram illustrating an apparatus for carrying out the present invention,
FIG. 6 is a diagram illustrating a device for carrying out the present invention regarding a rotating drum type weft storage device, and FIG. 7 shows the behavior of weft tension during flight using a conventionally known weft tension detector C. FIG. 2 is a diagram illustrating means for measuring. 1... Length measuring roller, 2a... Weft storage device (pool pipe), 2b...
Weft storage device (rotating drum), 3... weft gripper,
4... Spray nozzle, 5... Weft,
6...Guide, 7...Circuit Box %
A...Piezoelectric sensor, B...Photoelectric sensor,
C...Weft tension detector.

Claims (1)

[Claims] 1. Detect the change in the attitude and/or tension of the weft in the weft storage section of the loom that occurs when the weft flies, obtain the loom timing at which the change occurs (hereinafter referred to as weft change timing), and obtain the weft change timing. A water jet loom weaving method characterized in that weaving is performed by adjusting weft insertion conditions so that the weft change timing can give a good flying condition to the weft yarns that have been raised.