JP2562594B2 - How to determine the replacement of the yarn feeder - 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 automatically determining the quality of a weft feeder.

BACKGROUND OF THE INVENTION During the weaving stage, weft yarns are fed from a yarn feeder and, after measurement storage, are wefted into a warp yarn opening. In such a weft insertion process, the arrival timing of the weft yarn on the non-feeding side is electrically detected by one or more feelers. If there is a defective insertion, the feeler will
A poor weft insertion condition is detected and a signal for stopping the loom is generated by the loom controller.

Such a weft insertion defect, for example, weft entanglement, long pick or show topic, or weft thread breakage is detected by the feeler. However, it is not possible to determine whether the cause of the weft insertion failure is due to the physical property of the weft insertion thread or the misalignment of the weft insertion device itself based on only the signal from the feeler. For this reason, at the weaving factory, the weaver observes past weaving conditions, etc., and uses empirical intuition to determine the cause of the poor weft insertion, and if the weft insertion device is not properly adjusted,
This is adjusted, and if the quality of the yarn feeder is poor, the yarn feeder is replaced.

However, such a countermeasure is not performed in advance because it is performed after confirming the wedling state, that is, the stop of the loom. As a result, there is a possibility that poor quality fabrics will be continuously woven while the loom is actually stopped.

Therefore, an object of the present invention is to determine the quality of the yarn feeder in advance before the weaving stop of the loom, and to automatically replace the yarn feeder if necessary. The purpose is to prevent side-by-side stoppage due to poor physical properties.

Therefore, in the weaving process, the present invention measures the physical properties of the weft yarn at an appropriate period, detects the arrival timing of the weft yarn on the side opposite to the weft yarn at the time of weft insertion, and obtains those data. By comparing or statistically calculating the quality of the yarn feeder, the current yarn feeder is replaced with a new yarn feeder when the yarn feeder is defective. We try to prevent weaving due to defects and weaving of poor quality.

Here, the change situation of the physical properties of the weft thread, the change situation of the arrival timing, etc. are the difference between the maximum value and the minimum value, the difference between the average value and the actual measured value statistically obtained in advance, or the occurrence frequency. It is compared with the standard occurrence frequency and processed according to the result.

Structure and Operation of Weft Inserting Device First, FIG. 1 shows a schematic structure of the weft inserting device 1. The weft yarn 2 is drawn out from one of the plurality of yarn feeders 3, enters the inside of the funnel-shaped guide body 4, passes through the inside of the yarn guide tube 5, and is, for example, a drum type length measuring and storage device 6 After the length is measured and stored, the yarn is passed through the yarn guide 7 and the weft insertion nozzle 8 and is put into the warp yarn opening 9 together with the weft insertion fluid.

The weft yarn 2 in the weft insertion state has one or more feelers 1 at the tip end of the weft yarn on the side opposite to the yarn feeding side.
The electric signals detected photoelectrically by 1 and 12 are input to the control device 10 at the time of the detection. Here, the two feelers 11 and 12 are weft-insertion detection feelers as described, for example, in Japanese Utility Model Publication No. 57-50303, and one feeler 11 reaches the tip of the weft thread 2 which has been normally put in. The feeler 12 on the other side is provided at a position where the tip of the weft thread 2 that has been normally inserted cannot reach. Further, the weft yarn 2 passes through the tension detector 13 or the thickness detector 14 between the length measuring storage device 6 and the weft insertion nozzle 8, for example. This tension detector 13 uses a piezoelectric element, a load cell, etc. while the weft 2 is running.
The tension of the weft thread 2 is electrically detected and the signal is detected by the control device.
Send to 10. Further, the thickness detector 14 detects the thickness of the weft thread 2 as a light amount change by an optical sensor or the like, converts the change into the magnitude of an electrical signal, and similarly the control device.
I am sending it to 10.

On the other hand, the plurality of yarn feeders 3 are not knotted,
Independently, for example, an endless conveyor
It is attached to 15 holders 16 at regular intervals,
By the movement of the conveyor 15, the yarn feeding positions are sequentially indexed. That is, the conveyor 15 is wound around a pair of wheels 17 on, for example, a horizontal plane, and one of the wheels 17 has an indexing motor 18 and an indexing mechanism 19.
Depending on, it rotates by a predetermined index amount. In this way, the plurality of yarn feeders 3 are automatically guided to positions facing the funnel-shaped guide bodies 4 as needed. A cutter 26 and a drive unit 27 for the cutter 26 are provided on the inlet side of the guide body 4 and can be moved back and forth by a cylinder or the like.

The rotation control of the indexing motor 18 is controlled by the control device 10 and is turned on / off by the drive circuit 20. Further, the guide body 4 is provided with a suction nozzle 21 at the neck portion thereof, and by generating an air flow in the yarn guiding direction inside the yarn guiding tube 5, the weft yarn 2 is guided to the guiding body 4 and the yarn guiding tube. 5 is guided through the inside of the rotary yarn guide 61 of the length measurement storage device 6. For this purpose, this suction nozzle 21 is connected to the electromagnetic on / off valve by a pipe 22.
It is connected via 24 to a pressurized air source 23. Like the drive circuit 20, the on / off valve 24 is placed under the control of the control device 10 and is driven by the driver 25.

By the way, the control device 10 includes a microcomputer, and together with the control device 28 of the loom,
The program based on the method of the present invention is stored, data from the outside is input, necessary functions such as calculation, storage, and control are sequentially executed, and the quality of the current yarn feeder 3 is determined. Accordingly, the weft yarn 2 from the new yarn feeder 3 is guided to the length measuring and storing device 6 in place of the current yarn feeder 3.

Method of the Present Invention During weaving, the length measuring and storage device 6 pulls out the weft yarn 2 from the yarn feeder 3 at the yarn feeding position and winds the weft yarn 2 around the drum 62 by a predetermined number by the rotational movement of the rotary yarn guide 61. The length is measured and stored, and the latch pin 62 is unwound at the weft insertion timing to enable the weft insertion. Therefore, at this weft insertion timing, the weft insertion nozzle 8 injects a weft insertion fluid into the warp yarn opening 9 and, together with this jet flow, wefts the weft yarn 2 of a predetermined length into the warp yarn opening 9. I will do it.

During this period, the control device 10 starts the program of the method for determining the replacement of the yarn feeder based on the present invention and sequentially executes the program, as shown in FIG.

That is, during such weaving, feelers 11, 12
The tip of the weft yarn 26 in the weft insertion state is detected for each pick or for each predetermined pick, and an electrical signal is generated according to the time when the weft yarn tip reaches the end or the presence or absence of the weft yarn 2, and The data is sent to the control device 10 as data on the variation of arrival timing. In addition, the tension detector 13
And the thickness detector 14 respectively detect the changing state of the physical properties of the weft thread 2 during running during weft insertion, that is, its tension and thickness, and the magnitude corresponding to the tension value and thickness. Control device for electrical signal data of 10
Has been sent to.

Therefore, the control device 10 aggregates the data of the physical properties and the data of the arrival timing for each predetermined cycle, for example, for each predetermined number of picks, or for each constant time, and the variation thereof, for example, the maximum value of the thickness. And the minimum value, or the difference between the maximum tension value and the minimum tension value, the maximum arrival timing and the minimum arrival timing detected by the first feeler 11, or the first feeler 11 and the second feeler 12. The occurrence frequency per unit time (rotation number) detected by is aggregated, and the difference value thereof and the standard difference value are compared, or the occurrence frequency and the standard occurrence frequency are compared, and the Quantitatively determine the magnitude relationship.

Now, for example, when the difference between the maximum tension value and the minimum tension value is larger than the standard difference value, and the frequency detected by the second feeler 12 is larger than the standard occurrence frequency, that is, the weft thread 2 When the situation of the change in the physical properties of the machine and the variation of the arrival timing are largely changed from the standard situation or state, the control device 10 causes the cause of such a great change to the current quality of the yarn feeder 3. In order to replace the current yarn feeder 3 with a new yarn feeder 3 after determining that the yarn is defective, a replacement command signal is sent to the drive unit 27 and the drive circuit 20 of the cutter 26, and the loom controller 28 is activated. Send a signal to stop automatically.

Therefore, the cutter 26 first advances from the retracted position to cut the weft yarn 2 being fed between the current yarn feeder 3 and the guide body 4. At the same time or after that, the on / off valve 24 is in the open state in response to the exchange command signal,
The suction nozzle 21 generates an airflow in the threading direction inside the yarn guide tube 5, and discharges the cut weft thread 2 together with the airflow through the inside of the rotary yarn guide 61 to the outside. after this,
Between the length measuring and storage device 6 and the weft insertion nozzle 8, the weft yarn 2 is wound and removed from the outer circumference of the drum 62 by a weaving machine or a known automatic yarn processing device. Examples of this known automatic yarn processing device include a weft yarn discharging mechanism (for example, a suction tube, a winding roller, etc.) provided on the outlet side of the weft insertion nozzle 8. According to this, the weft thread 2 is automatically ejected to the outside by the ejection mechanism and is removed together with the jetting of the weft insertion nozzle 8.
After that, the control device 10 confirms the above-described series of operations, and then drives the indexing motor 18 and the indexing mechanism 19 by giving a start signal to the drive circuit 20 to supply the yarn currently in use. Move body 3 to the next position,
A new yarn feeder 3 is automatically guided to this yarn feeding position and stopped there. Of course, the winding end of the weft yarn 2 of the new yarn feeder 3 is in a free state. Therefore, after that, when the suction nozzle 21 generates an airflow in the suction direction inside the guide body 4, the new end of the weft thread 2 of the yarn supplying body 3 moves together with the airflow inside the guide body 4. ,
It is guided inside the yarn guide tube 5, jumps out from the rotary yarn guide 61, and is ready to be wound around the outer periphery of the drum 626. After a lapse of a certain time, the control device 10 confirms the pulled-in state of the weft yarn 2 by, for example, a sensor, terminates the operation of replacing the yarn feeder, and gives a starting permission signal to the loom control device 28. In addition, the defective yarn feeder 3 that has moved to the position next to the yarn feeding position is engaged with the base portion of the defective yarn feeder 3 so as not to be used again by the movement of the conveyor 15. Removal lever 31 provided at an appropriate position
Is driven by the drive unit 30 such as a rotary solenoid in the direction of the arrow in the figure to the standby position, and is automatically removed from the holder 16.

After that, the weft yarn 2 is preliminarily wound on the side length storage device 6 for the length required for the next weft insertion, and then passed through the weft insertion nozzle 8. Such pre-winding operation and weft thread pulling operation are described in Japanese Patent Application No. 60-
It can be realized by the invention of the patent applicant of 199540 or Japanese Patent Application No. 60-196822.

As described above, the control device 10 first executes the program according to the present invention to grasp the change status of the physical properties of the weft thread 2, and confirms the change of the weft insertion status on the condition of the large change. , And the change in the physical properties of the weft yarn 2 and the change in the arrival timing are used as the AND condition, and an exchange command is issued for the current yarn feeder 3 only when both are in a large change state. If there is no significant change in the physical properties of weft yarn 2,
When the arrival timing fluctuates greatly, the control device 10
Determines that the arrival timing is unstable and that the weft insertion device 1 is not adjusted properly, and does not issue a replacement command. If necessary, a warning signal such as readjustment is generated to notify the weaver. Do the action.

Modified Example of the Invention In the above-described embodiment, the tension and the thickness of the weft yarn are simultaneously detected as the physical properties of the weft yarn. However, the situation of the change of the physical properties takes into account one or two of these information. Done. Further, the variation of the arrival timing may be detected by only one of the feelers 11 and 12, or both data from them may be simultaneously captured and processed.

Further, the change state of the physical property is not limited to the one determined from the difference between the maximum value and the minimum value of the measurement item, and for example, the frequency of occurrence of abnormal tension, the number of times of occurrence of abnormal tension per predetermined number of picks, per predetermined time It may be judged from the situation of continuous occurrence of defects, the density of occurrence of abnormal tension per unit time, and the like. Further, these physical properties and changes in arrival timing can also be determined by a statistical method.
Such a statistical method is useful for highly reliable judgment of the quality of the yarn feeder. In the statistical method, physical properties and arrival timing data are aggregated as a normal distribution curve, and the average value or standard deviation is calculated to compare with the standard value, and the current salary is based on the comparison result. The quality of the thread 3 will be judged.

Further, in the above-described embodiment, the arrival timing is detected by the cloth edge position of the anti-fiber feeding body, but the arrival timing can also be indirectly detected on the side of the length measurement storage device 6. That is, at the time of weft insertion, the weft thread 2 is unwound while running on the outer peripheral surface of the drum 62, and the movement along the outer peripheral surface of the weft thread 2 at that time is proportional to the flight distance of the tip of the weft thread 2. . Therefore, assuming that the length required for weft insertion of one pick is four turns on the drum 62, when the four weft yarns 2 are completely unwound, at that time, the arrival timing of the tip of the weft yarn 2 is reached. It corresponds to. Further, a feeler for detecting thread breakage may be provided on the inlet side of the weft insertion nozzle 8.

Furthermore, the tension detector 13 and the thickness detector 14 may be provided in the vicinity of the yarn guiding tube 5 and in the path thereof.

EFFECTS OF THE INVENTION In the present invention, the physical properties of the weft yarn are continuously measured during weaving, and the variation of the weft insertion is observed in relation to this physical property, and the physical property data is a defect of the yarn. Is displayed, and when there is a large variation in the actual arrival timing, it is judged that the current yarn feeder is defective and a new yarn feeder is automatically supplied. The inconvenience of continuous weaving can be prevented. Further, unlike the conventional case, empirical intuition or the like is not required for determining the quality of the yarn feeder, so that high skill is not required and management of the weaving state is simplified.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a weft insertion device, FIG. 2 is a flow chart of the method of the present invention, and FIG. 3 is a flow chart of a yarn feeder replacement operation. 1 ... weft insertion device, 2 ... weft thread, 3 ... thread feeder, 4
...... Guide body, 5 ...... fiber guide tube, 6 ...... length measuring storage device, 8 ・ ・ ・
… Weft insertion nozzle, 10 …… Control device, 11,12 …… Feeler, 13 …… Tension detector, 14 …… Thickness detector, 15 …… Conveyor, 18 …… Indexing motor, 21 …… Suction nozzle, twenty four…
… On / off valve, 26 …… Cutter, 28 …… Loom control device.

Claims (4)

(57) [Claims] 1. A weft insertion device for pulling out a weft from a yarn supplying body and inserting the weft in the warp yarn opening after length measurement storage,
In addition to measuring the physical properties of the weft thread, the arrival timing of the weft thread on the anti-feeding side during weft insertion is detected, and the data of the change status of the physical properties of the weft thread and the fluctuation status of the arrival timing are calculated and processed. , The value of each processing result is compared with the respective reference value, and when both data exceed the reference value, a replacement command for the current yarn supply body is generated. How to determine. 2. The method for discriminating replacement of a yarn feeder according to claim 1, wherein the arithmetic processing is obtained by a difference between a maximum value and a minimum value. 3. The method for discriminating the replacement of a yarn feeder according to claim 1, wherein the arithmetic processing is obtained by a difference between a standard average value and a measured value which are obtained in advance. 4. The method of discriminating replacement of a yarn feeder according to claim 1, wherein the calculation processing is performed by comparing the occurrence frequency of each measured value with a standard occurrence frequency.