JPH01207441A - Method for maintenance and control in shuttleless loom and apparatus therefor - Google Patents

Abstract

PURPOSE:To enable more improvement in high productivity originally held by a shuttleless loom, by continuously sensing weft yarn tension, taking out the tension as a wavy curve corresponding to a crank angle per rotation of a loom, finding out an abnormal wave form and carrying out maintenance and control. CONSTITUTION:A tension sensor 10 is provided between a gripper 4 on the yarn feeding side and a nozzle 3 and tension of a weft yarn (Yb) during flying is continuously sensed, converted into an electric signal, then passed through an A/D converter and inputted to a computer, which displays the tension as a wavy curve corresponding to a crank angle per rotation of a loom in a display device. The wavy curve is compared for plural rotations of the loom to find out an abnormal wave form. Maintenance and control are carried out by regulating at least one of picking timing, pump or nozzle conditions causing the above- mentioned abnormal wave form.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is applicable to water jet looms and air jet looms.
The present invention relates to an efficient maintenance management method for shuttleless looms such as looms, and an apparatus for implementing this method.

[Prior art]

Conventionally, as a method for adjusting the weft insertion timing in shuttleless looms, an abnormality in the weft insertion timing was detected and adjusted while observing the state of the weft thread at the moment it flew using a stroboscope. There is. However, this method requires a lot of training, takes a long time to make adjustments, and lacks accuracy. Another drawback is that it is not possible to know the continuous weft flight state per pick.

Therefore, a method was devised to adjust the weft insertion timing by detecting the weft thread tension between the gripper and the nozzle on the weft supply side and recording the detection signal on an electromagnetic oscilloscope. Kaisho 60-5265
(See Publication No. 3). Although this method can continuously detect the flying state of the weft yarn per pick, it has the disadvantage that it requires a great deal of effort to organize the data if you want to know the degree of variation. there were. In addition, with this method, it is not possible to know in real time how the weft thread flight state after adjusting the weft insertion timing has changed compared to before the adjustment, and in order to know the change, it is necessary to collect data. We had to repeatedly organize the data and compare the adjustment results. Therefore, it has been unavoidable that it takes some time for the adjustment to be completely completed.

Further, Japanese Patent Application Laid-Open No. 60-52652 proposes a device that evaluates the cause of stoppage and weft insertion performance based on fluctuations in a detection signal indicating the presence or absence of a weft yarn detected by a weft yarn feeler. However, since this device performs evaluation based on signals only when the presence or absence of weft yarn is detected, it is difficult to perform highly accurate evaluations of various factors such as weft insertion timing conditions, pump conditions, nozzle conditions, etc. However, it was still difficult to perform the evaluation correctly in real time.

In this way, with conventional maintenance management methods, it is not possible to make real-time adjustments in a short period of time, so it takes time to make initial adjustments before starting the loom, making it impossible to take full advantage of the high productivity inherent in shuttleless looms. The current situation is that there was no such thing.

[Purpose of the invention]

An object of the present invention is to provide a maintenance management method and device for a shuttleless loom that can eliminate the problems of the prior art as described above, enable real-time maintenance adjustment, and thereby greatly improve productivity. It is in.

[Structure of the invention]

The maintenance management method of the present invention that achieves the above object includes a tension detector provided between the gripper and the nozzle on the weft yarn supply side, and this tension detector continuously detects the tension of the weft yarn in flight. , by extracting a waveform curve corresponding to the crank angle per revolution of the loom and comparing this waveform curve for multiple revolutions of the loom, an abnormal waveform was found, and the weft insertion timing conditions that caused this abnormal waveform were found.

This method is characterized by adjusting at least one of pump conditions or nozzle conditions.

Further, the device of the present invention provides a shuttleless loom with a tension detector that detects the weft tension between the gripper and the nozzle on the weft supply side of the loom and converts it into an electric signal, and A crank angle detector that detects the angle and converts it into an electrical signal is provided, and a maintenance management device that inputs electrical signals from both the tension detector and the crank angle detector is provided, and this maintenance management device includes a crank angle detector that detects the angle and converts it into an electrical signal. an A/D converter that converts the electrical signal into a digital signal, and inputs the output of this A/D converter and the signal of the crank angle detector to form a waveform curve corresponding to the crank angle per revolution of the loom. The present invention is characterized in that it includes a central processing unit and a display device that outputs the waveform curve.

As described above, the present invention detects the tension of the weft yarn injected from the nozzle between the gripper and the nozzle, and extracts the weft yarn tension as a waveform curve corresponding to the crank angle per revolution of the loom. There are certain characteristics. By extracting the waveform curve corresponding to the crank angle in this way, it is possible to know the weft thread flight state per pick as a continuous change. - By comparing these waveform curves with each other, the presence or absence of an abnormality can be found from the degree of variation detected. Further, since the degree of variation detected in this way takes a different form depending on the cause of the abnormality, it becomes possible to know in real time in which part of the loom operating state the abnormality is located.

In the present invention, the weft tension can be detected by a tension detector installed between the gripper and the nozzle of the shuttleless loom. Although the detection principle of this tension detector is not particularly limited, it is preferable to use one that converts the detected tension into an electrical signal in order to process it with a computer and create a waveform curve corresponding to the above-mentioned crank angle. Such tension detection devices include a three-point type using multiple levers, which is commonly used as a tension detection mechanism for running yarn, and a 9-point tension detection device.
As shown in the figure, a device in which the detection lever 10a of the tension detector 10 is brought into contact with the weft yarn Yb flying between the gripper 4 and the nozzle 3 in a bent state can be preferably used.

In order to display the waveform curves for multiple rotations of the loom in an overlapping manner, it is preferable to directly display the waveform curves as images on the screen of the display device. This makes it possible to detect abnormalities in real time. Further, the display of such a plurality of waveform curves may be printed and displayed on paper using a printer. Further, it is desirable to save the detected data on a floppy disk, magnetic tape, etc. so that it will not be erased even if the device power is turned off.

By overlapping the waveform curves of multiple rotations of the loom, a band-shaped waveform curve with a constant width of tension variation is formed on the display screen or printed paper surface. The width of this band-like variation is constant when the loom operating conditions are normal, but if there is an abnormality somewhere in the operating conditions, the tension will be abnormally higher in the angular part along the crank angle than in other parts. This causes a large amount of variation. Therefore, the presence or absence of an abnormality can be easily discovered from this abnormally large tension variation portion.

Furthermore, as described above, the abnormally large tension variations occur at different parts (crank angles) depending on the cause of the abnormality. In other words, causes of abnormalities include weft insertion timing conditions such as injection start angle, gripper opening/closing angle, and weft thread cut angle, pump conditions such as water volume, water pressure, and spring elastic force, and nozzle conditions such as injection hole diameter and injection direction. , the part where abnormal tension variation occurs differs depending on these conditions. Therefore, by investigating the form of tension variation for each abnormality cause in advance, it is possible to easily know in real time whether there is an abnormality by comparing the form of tension variation investigated in advance with the waveform curve under inspection. will be possible.

In addition, by storing data on the form of tension variation for each cause of abnormality investigated in advance in the computer memory and comparing it with the waveform curve under inspection, the presence or absence of an abnormality and the location of the abnormality can be automatically determined. It can be displayed.

The invention will now be explained with reference to embodiments shown in the figures.

FIG. 1 shows an example of a water jet room for carrying out the method of the invention.

In this water jet loom, a large number of aligned warp yarns Ya are pulled out at a constant speed and a shed 2 is formed behind the reed 1 by the alternating up and down movement of the pair of healds 5,5.

Cutters 12.12 are provided on both sides of this shed 2,
A nozzle 3 is provided outside one of the cutters 12, and a gripper 4 is further provided outside the nozzle 3.

A pump 6 is connected to the nozzle 3, and pressurized water is supplied from the pump 6 every time the weft is inserted, so that the weft yarn Yb is jetted from the nozzle 3 toward the shed 2 together with the pressurized water. The weft yarn Yb injected into the shed 2 reaches the reed 1 at the same time as it finishes flying.
is driven into the fabric F side, and at the same time both ears are cut with cutter 1.
2.Cut by 12. The weft yarn Yb is continuously supplied from the package 7 by the supply roller 8, but is once sucked and stored in the negative pressure storage pipe 9. The suctioned and stored material is drawn out by the nozzle 3 at each weft, and the remaining insufficient portion is directly supplied from the supply roller 8.

In such a shuttleless loom, a tension detector 10 is provided between the gripper 4 and the nozzle 3 to detect the tension of the weft thread during flight. Furthermore, a tweeter 1) for detecting the arrival of the weft yarn yb is provided on the opposite side to the nozzle installation side, on the side where the weft yarn yb arrives.

FIG. 2 schematically shows a maintenance management device 20 for carrying out the present invention, in which a tension detector 1 provided in the above-mentioned shuttleless loom is shown.
It has a built-in computer that forms a waveform curve corresponding to the crank angle from the weft thread tension detected by the machine. In this embodiment, the maintenance management device 20 also forms the tweeter energization amount based on the detection signal of the tweeter 1) as a waveform curve corresponding to the crank angle.

The maintenance management device 20 has an A/D (analog/digital) converter 21 as an input section, and a central processing unit (CPU) 22 and a memory 23 as data processing sections.
have. Further, a display device 24 and a printer 25 are connected to the central processing unit 22 as output devices, and a floppy disk 26 is also connected for data storage.

A keyboard 27 is also connected for inputting operating conditions and the like.

The A/D converter 21 is connected to receive signals from a tension detector 1o and a tweeter 1) installed on the shuttleless loom side, respectively. The tension detector 10 generates an electric signal depending on the magnitude of the detected tension, and the tweeter 1) generates an electric signal indicating whether or not the weft yarn has arrived. This tweeter 1) consists of a pair of electrodes, and when a water-containing weft thread bridges, electricity is applied to generate a signal. The signal of this tweeter 1) is transmitted to the control panel 30.
The amplifier 28 increases the A/D converter 21.
is input.

In addition, a tweeter timing detection iron piece 31 is installed on the shuttleless loom side.
and a proximity switch 32 are provided as crank angle detectors. The tweeter timing detection iron piece 31 rotates at the same rotation speed as the loom, and generates a pulse to the proximity switch 32 by approaching the proximity switch 32 once per rotation of the loom, and the pulse signal is sent to the control panel. The signal is input to the central processing unit 22 via 30 amplifiers 29.

The reason for inputting the pulse signal as described above is to obtain a weft tension fluctuation curve in synchronization with the crank angle every rotation of the loom. Therefore, the means for generating such a pulse signal itself may be performed by a method other than the method based on detecting the tweeter timing, for example, it may be performed by means such as detecting the rotation of the crankshaft or the position of the reed. .

In order to inspect whether the operating condition of a loom is normal using the maintenance management bag 220 described above, first, the operating condition of the loom to be inspected is input to the central processing unit 22 using the keyboard 27.
Enter. On the other hand, the weft tension signal and the tweeter signal detected by the tension detection device 10 and the tweeter 1) are converted into digital signals by the A/D converter 21 and input to the central processing unit 22. The central processing unit 22 processes these signals together with the tweeter timing signal (rotation signal) input from the proximity switch 32 as described below, and displays the results as a waveform curve corresponding to the crank angle on the display device 24, printer 25. Output to floppy disk 26 or the like.

To explain in detail with reference to FIGS. 3A and 3B, after inputting the operating conditions using the keyboard 27, when a command to start data sampling is sent to the central processing unit 22, the data display flow in FIG. 3A changes from F6 to Fl. and calls the data sampling flow of FIG. 3B. In this data sampling flow, the data counter is first cleared to 0, and waits for the feeler timing signal (loom rotation signal) 8 from the proximity switch 32 to enter the central processing unit 22 at Sl.

When this feeler timing signal C is input, the process moves to 82.
The weft tension signal A and the feeler signal port are A/D converted, and the converted data is stored at 83. Then,
At S4, it is checked whether or not the feeler timing signal C is input after the second rotation of the loom. If this signal is not input, the process moves to S5 and the data counter is incremented. Then, until the next feeler timing signal C is input, S2. S3, 34°S5, S2-
Repeating the loop 1-----, A/D conversion of the tension signal A and the feeler signal port is continued. Since the time during this period is constant, the data counter is incremented at constant time intervals.

Then, when the check in S4 indicates that the feeler timing signal after two revolutions of the loom is input, the process moves to S6 and moves to F2 of the called data display flow. In this way, the data sampled between the previous feeler timing signal C and the feeler timing signal C after two revolutions of the loom is formed as a waveform curve corresponding to the crank angle. Here, data for two rotations of the loom is sampled because data for one rotation of the loom can only be obtained from the feeler timing to the next feeler timing. This is because it cannot be obtained continuously. However, if the crank angle 06 is detected by another detector, it is possible to continuously obtain data from 0 to 360 degrees using data for one revolution of the loom.

After moving to F2 of the data display flow, it is checked whether the rotation speed is stable. This is because the tension signal A and the feeler signal at the time of starting and stopping the loom are unstable data, so it is desirable to omit these data from the inspection data. Therefore, when checking with F2, if the rotation speed is not stable, F2 is checked.
6 and re-acquire the data again.

If the rotation speed is stable by checking F2, move to F3,
Check whether to perform overlapping display according to the present invention or to erase the previous sampling data waveform.

In the present invention, displaying images in an overlapping manner is an extremely effective means for observing variations.

When deleting once and once, it is best to use it when you want to observe the adjustment results in real time, for example when adjusting the pump water pressure during operation to match the restraint transition start angle to the desired crank angle. If you do not want to display overlapping data as a result of the above check, move to F4, delete the previous waveform, and move to F5 to display the waveform of new data.If you want to display overlapping data as a result of the check, move to F5. Displays new data over the previously displayed waveform.

Below, F6. Fl, F2. F3. (F4).

Repeat the loop of F5, F6------. When a necessary number of data have been obtained by repeating this process, a command to end sampling is inputted from the keyboard 27 to stop the sampling. This number of times may be appropriately commanded while driving, but it is also possible to set the number of times of display in advance and automatically end the display when the number of times of display is reached.

As described above, the maintenance management device 20 uses the tension signal of the weft yarn yb detected by the tension detector 10 and the feeler timing signal (rotation signal) generated by the feeler timing detection iron piece 31 and the proximity switch 32 for each rotation of the loom. ), a waveform curve of weft thread tension corresponding to the crank angle is formed and displayed. At the same time, a waveform curve of the energization amount corresponding to the crank angle is formed and displayed based on the energization amount signal detected by the feeler 1).

Among these, the waveform curve of the weft thread tension becomes, for example, a waveform curve as shown in FIG. 4 when the flying state of the weft thread is normal. This waveform curve has a, b, corresponding to the crank angle.
,b',c,d.

There is a significant change in the weft thread tension at each position d', e, and e'.

Here, a is the time of weft thread cutting (weft thread cutting angle), and since the weft thread is cut almost at the same time as beating, the weft thread tension is high, and the tension decreases rapidly immediately after the cutting. In addition, b is when the nozzle 3 starts jetting for the next weft insertion (injection start angle), b゛ is the tension peak generated when the weft thread is pulled by water at the start of jetting (injection start tension peak angle) , c is when the weft yarn starts flying from nozzle 3 (flying start angle), e is when the flying ends (flying end angle), and e'' is when the flying yarn is caught in the gripper. This is when a tension peak occurs due to a sudden drop in flight speed (tension peak angle at the end of flight).

The intermediate point d between the flight start angle C and the flight end angle e is called the restraint start angle. That is, from C to d is a process in which the weft threads of the stored bones in the storage pipe 9 are pulled out in an unrestrained state, and the point at which the stored bones are exhausted and begins to be pulled out while being restrained by the supply roller 8 is the above-mentioned restraint start angle. It becomes d. Above b % C is the leading angle, c and d is the free flight angle,
The range between d and % e is called a restrained flight angle, and the weft tension is relatively low at a free flight angle where the yarn is pulled out without restraint, but becomes high at a restrained flight angle where it is pulled out while being restrained. Also,
d'' is the time when the tension peak occurs due to the transition from free flight to restrained flight and the flight speed suddenly decreases to the supply speed of the supply roller 8 (restricted flight tension peak angle),
Create a very large peak.

When such waveform curves for multiple rotations of the loom are displayed superimposed on the display device 24 or the printer 25, the curves drawn from the plurality of waveform curves are shown in FIGS. 5, 6,
As shown in Fig. 7, the result is a band-like pattern with varying width.

Of these, Figure 5 shows the situation when the weft thread flight state is stable, and Figures 6 and 7 show the situation when the operating conditions are abnormal and the weft thread flight state becomes unstable. It is what it is when you are there. Specifically, the abnormality shown in FIG. 6 occurs when the amount of water supplied by the pump is insufficient, and the abnormality shown in FIG. 7 occurs when the water pressure supplied by the pump is insufficient.

The waveform curve for multiple runs under normal conditions in Figure 5 shows that although there is some variation in the weft thread tension, the variation is the same as that of the loom.
With respect to the crank angle per revolution, at any angle, the variation is within a certain range.

On the other hand, in the abnormal state shown in Figs. 6 and 7, the degree of variation in the weft thread tension in the restraint flight tension peak angle d' and the flight end tension peak angle e' is different from that of other injection start tensions. The peak angle b'' is abnormally large compared to the flight start angle C. Therefore, by finding such abnormal variations, it is possible to know in real time that there is an abnormality in the operating state. Furthermore, the forms of these variations vary depending on the cause of the abnormality, as shown in Figures 6 and 7. When the amount of water supplied by the pump is insufficient, the form shown in Figure 6 is different. In addition, when the water pressure of the pump is insufficient, the condition shown in Fig. 7 occurs, and the weft thread tension at the flight end tension peak angle e゛ is abnormally higher than the restraint flight tension peak angle d゛. Therefore, if the form of variation at the time of such an abnormality is obtained in advance, the cause of the abnormality can be easily determined by comparing it with this.

In this example, the abnormal waveform curve was illustrated for the case of insufficient water volume or insufficient water pressure in the pump, but similar abnormal waveform curves can be created for conditions such as weft timing conditions and nozzle conditions, and these can be created in advance. By doing so, the same detection as above can be performed.

Furthermore, from the signal of the energization amount of the tweeter 1) that detects the arrival of the weft thread, the rotation signal of the tweeter timing detection iron piece 31 and the proximity switch 32, a waveform curve corresponding to the rank angle is formed as shown in FIG. . In this FIG. 8, a narrow peak P8 that appears before and after the restraint start angle d is
This indicates that only water has reached the tweeter 1) before the weft, and the large peak P, which appears before and after the flight end angle e, indicates that the weft containing water has arrived. There is. When a peak PT with such a large width cannot be obtained, it means that the weft yarn has not reached the target.

〔Effect of the invention〕

As described above, according to the maintenance management method of the present invention, the operational status of the loom can be grasped in real time, and when there is an abnormality, the cause can also be reliably grasped. Therefore, unlike the conventional method, deep experience is not required for the adjustment work, and the work can be done easily and quickly.

Furthermore, since quantitative adjustment becomes possible, the operating conditions of multiple looms can be matched accurately. Further, the maintenance management method of the present invention can be implemented by the apparatus according to the present invention.

Therefore, according to the present invention, it is possible to efficiently maintain and manage a shuttleless loom, and the high productivity inherently inherent in a shuttleless loom can be further improved.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of a shuttleless loom (water jet loom) for implementing the present invention, Fig. 2 is a block diagram of a maintenance management device equipped on the same shuttleless loom, and Fig. 3 A and B are ,
A data flow diagram (Figure 3A) and a data sampling flowchart (Figure 3B) for operating the same maintenance management device, respectively.
It is. Fig. 4 is a waveform curve diagram corresponding to the crank angle of the weft thread tension formed by the same maintenance management device, and Figs.
Figure 7 is a diagram of the waveform curves for multiple rotations of the loom displayed overlappingly. Figure 5 is for normal operation, Figures 6 and 7 are
The figure shows abnormal operation. FIG. 8 is a waveform curve diagram of the amount of current detected by the warp feeler formed by the maintenance management device, which corresponds to the crank angle. FIG. 9 is a perspective view showing an example of a tension detector. Ya... warp thread, Yb... weft thread, 2... shed,
3... Nozzle, 4... Gripper, 6... Pump,
10...Tension detector, 1)...Tweeter, 20...
・Maintenance management device, 21...A/D converter, 22・
...Central processing unit, 23...Memory, 24...Display device, 25...Printer. Agent Patent Attorney Nobuo Ogawa −

Claims (5)

[Claims] (1) A tension detector is provided between the gripper and the nozzle on the weft supply side, and this tension detector substantially continuously detects the tension of the flying weft yarn, and the tension is detected per rotation of the loom. A waveform curve corresponding to the corner is extracted, and this waveform curve is compared for multiple rotations of the loom to find an abnormal waveform, and at least one of the weft timing conditions, pump conditions, or nozzle conditions that caused this abnormal waveform is adjusted. A maintenance management method for shuttleless looms characterized by the following. (2) The maintenance management method for a shuttleless loom according to claim 1, wherein the waveform curves for multiple rotations of the loom are displayed superimposed on the screen of a display device. (3) The maintenance management method for a shuttleless loom according to claim 1, wherein the waveform curves corresponding to multiple rotations of the loom are printed and displayed in an overlapping manner on paper using a printer. (4) A tension detector is installed between the gripper and the nozzle on the weft yarn supply side, and this tension detector converts the tension of the flying weft yarn into an electric signal, and this electric signal is sent to a computer using an A/D converter. find the abnormal waveform by displaying it on a display device as a waveform curve corresponding to the crank angle per revolution of the loom, and adjust at least one of the weft insertion timing conditions, pump conditions, or nozzle conditions that caused this abnormal waveform. A maintenance management method for a shuttleless loom, which is characterized by: (5) A shuttleless loom is provided with a tension detector that detects the weft tension between the gripper and the nozzle on the weft supply side of the loom and converts it into an electrical signal, and also detects the crank angle of the loom. A crank angle detector that converts into an electrical signal is provided, and a maintenance management device is provided that inputs the electrical signals of both the tension detector and the crank angle detector. A/D to convert to signal
a converter, a central processing unit that inputs the output of the A/D converter and the signal of the crank angle detector to form a waveform curve corresponding to the crank angle per revolution of the loom, and a display that outputs the waveform curve. A maintenance management device for a shuttleless loom, characterized in that it is provided with a device.