JP2008285783A - Method for detecting abnormal warp tension in loom - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for detecting an abnormal warp tension, enabling the setting of an abnormal tension reference value capable of appropriately dealing with the optimal weaving condition of a woven fabric. <P>SOLUTION: On the completion of the weaving of the woven fabric of a scheduled length, operated at present, the loom is stopped, and a warp setting work of exchanging a cross roller 13 with a new cross roller, exchanging a warp beam 4 with a new warp beam, and a linkage of new warp yarns with an old warp yarns are performed. After the completion of the warp setting work, the kind of a woven fabric, weaving conditions, etc., including the warp tension are set in a memory part of a controlling device 2, and a test operation is performed. The controlling device 2 calculates the abnormal tension reference value based on the maximum value of the warp tension on the test operation of a new fabric, which is output from a load cell 19 during the operation. After setting the abnormal tension reference value, the loom is stopped, and then the operation of the loom is started by operating a starting switch. During the operation of the loom, the presence or absence of the abnormal warp tension is detected by comparing the warp tension detected by the load cell 19 with the abnormal warp tension reference value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for detecting an abnormal tension of a warp that enters a high tension state exceeding a limit during operation of the loom and stopping the loom.

  If an abnormal tension occurs in the warp that is in a high tension state exceeding the limit during the operation of the loom including inching, there is a risk that warp damage or weaving may occur if weaving is continued. For this reason, conventional warp tension is detected by the warp tension detecting mechanism and compared with a preset reference value in the control device of the loom to determine the abnormal tension of the warp and stop the loom. It is generally done from.

  For example, in Patent Document 1, the worker sets in advance the upper and lower limits of the warp tension according to the process conditions and quality requirements of work in progress, which is one of the weaving conditions, in the setting devices 11 and 13. The warp tension detected by the tension detection lever 2 of the tension roller 1 during the operation of the loom is compared with the upper limit value and the lower limit value in the comparators 9 and 12, and when the upper limit value or lower limit value is exceeded, it is determined that abnormal tension has occurred. And the loom is stopped.

Further, in Patent Document 2, a value that cannot be generated when the warp is normal and a value at which the warp does not cut is preset as a reference value. Similar to Patent Document 1, the warp tension detected by the warp tension detection sensor 4 during the operation of the loom is compared with the reference value. If the reference value is exceeded, the loom is judged to be abnormal.
Japanese Patent Laid-Open No. 61-13849 JP-A-8-109549

  In recent years, in the looms, so-called electronic opening devices that allow free opening movement by a dedicated motor arranged in each frame and so-called electronic dobby opening devices that can electrically control the dobby mechanism have become widespread, and complex fabrics. The warp opening movement corresponding to can be performed at high speed. For this reason, the versatility of the loom increases and a wide variety of fabrics are woven. However, with the increase in the types of fabrics, the types of warps also increase, and depending on the warp used, the upper and lower limits or reference values (hereinafter simply referred to as reference values) set in advance as in Patent Document 1 and Patent Document 2 described above. In other words, the actual warp tension does not sufficiently correspond. That is, the conventional reference value is generally calculated by multiplying the warp tension set as one of the weaving conditions corresponding to the new woven fabric after the machine setting by a predetermined constant. When the loom is operated on the basis of the reference value, the optimum weaving conditions are actually set and the detected warp tension may vary depending on the type of warp used, even though weaving is possible. There is a frequent problem that the loom stops because the reference value is exceeded. This problem tends to occur more frequently as the warp tension set for the fabric is lower. That is, in the method of determining the upper limit value by multiplying the set warp tension by a predetermined constant, the lower the set warp tension, the narrower the allowable range between the set warp tension and the upper limit value. Therefore, even if the warp tension is increased so as not to cause problems such as cutting of the warp, the upper limit value may be exceeded and the loom may stop abnormally. Such unnecessary stoppage of the loom often occurs immediately after the start of the operation of the loom. In this case, there is a serious problem that the operation cannot be started.

  An object of the present invention is to provide a method for detecting an abnormal warp tension that enables setting of an abnormal tension reference value that can appropriately correspond to an optimum weaving condition of a woven fabric.

  The invention of claim 1 is directed to a loom equipped with a dedicated warp feeding motor, a warp tension detecting mechanism, and a control device for them provided separately from the loom driving motor. Weaving conditions are set, a trial operation of the loom is performed based on the weaving conditions, and an abnormal tension reference value of the warp is calculated based on the warp tension during the trial operation detected by the warp tension detection mechanism during the test operation. The loom is set in the control device, the warp tension detected by the warp detection mechanism during the subsequent operation of the loom is compared with the abnormal tension reference value, and the loom when the warp tension reaches the abnormal tension reference value. It is characterized by stopping. The trial operation in the present invention includes all operations such as continuous operation of the loom and intermittent forward rotation or reverse inching before the operation operation of the loom after the machine work.

  According to the present invention of claim 1, the warp tension at the time of trial operation of the new fabric after the machine work is detected before the operation of the loom, and the abnormal tension reference value is calculated based on the detected warp tension, Therefore, an abnormal tension reference value suitable for a new fabric can be obtained, and an unnecessary stoppage of the loom is not caused during the operation.

  The invention of claim 2 is characterized in that it is calculated based on the maximum value of the warp tension during the trial operation, so that there is no problem that the loom stops at the warp tension within the appropriate range of the new fabric. can do.

  The present invention of claim 3 is characterized in that it is calculated based on the average value of the warp tension at the time of the trial operation. A suitable abnormal tension reference value can be set.

  The present invention can set an appropriate abnormal tension reference value for a wide variety of fabrics, and can avoid an unnecessary stopping operation during the operation of the loom.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 shows a warp feeding mechanism, a woven fabric winding mechanism and a control mechanism of a loom for carrying out the present invention.

  The loom drive motor 1 receives the operation control of the control device 2. A warp feeding motor 3 capable of forward and reverse rotation independent of the loom driving motor 1 drives the warp beam 4 and feeds the warp T. The warp yarn T fed from the warp beam 4 is passed through the back roller 5 and the tension roller 6 to the reeds 7 and 8. A woven fabric W formed by beating a weft thread (not shown) inserted between the warp threads T passes through an expansion bar 9, a surface roller 10, a press roller 11, and a wrinkle removing guide member 12. It is wound around the cross roller 13. The surface roller 10 that pulls the woven fabric W toward the cross roller 13 in cooperation with the press roller 11 obtains a driving force from the loom driving motor 1. The cross roller 13 rotates in conjunction with the surface roller 10.

  The tension roller 6 is attached to one end of the tension lever 14, and tension is applied to the warp T by a tension spring 16 attached to the other end arm 15 of the tension lever 14. The tension lever 14 is rotatably supported by the other end arm 18 of the detection lever 17, and a load cell 19 is connected to one end of the detection lever 17. The warp tension is transmitted to the load cell 19 via the tension roller 6, the tension lever 14 and the detection lever 17, and the load cell 19 outputs an electric signal corresponding to the warp tension to the control device 2 described later. Accordingly, the tension roller 6, the tension lever 14, the detection lever 17 and the load cell 19 constitute a warp tension detection mechanism of the present invention.

  The function panel 20 indicated by phantom lines has an input means 21 for inputting a weaving condition including warp tension corresponding to the fabric type and each fabric, a loom start switch 22, a loom stop switch 23, and a forward rotation inching switch of the loom. 24 and a reverse inching switch 25 of the loom are provided and are electrically connected to the control device 2 respectively. The control device 2 includes a rotary encoder 26 for detecting the rotational angle of the loom disposed in the drive system of the loom driving motor 1 and a rotary encoder for detecting the rotational angle of the motor disposed on the rotary shaft of the warp feeding motor 3. 27 are electrically connected to each other. In the embodiment shown in FIG. 1, it is described that the loom driving motor 1, the warp feeding motor 3 and the like are controlled by one control device 2, but a warp opening device, a woven fabric take-up motor, etc., not shown. It is possible to implement the present invention even in a control system that includes a dedicated control device including each of them and connects each control device to the control device 2 having a function as a host.

  The control device 2 outputs drive signals to the loom driving motor 1 and the warp feeding motor 3 to start the operation of the loom. During the operation of the loom, the control device 2 outputs the warp tension detection signal output from the load cell 19, the motor rotation angle detection signal output from the rotary encoder 27 of the warp feeding motor 3, and the rotary encoder 26. A loom rotation angle detection signal is input. Based on each detection signal, the control device 2 outputs a drive signal to the warp feeding motor 3 so as to coincide with the warp tension preset in the storage unit.

On the other hand, the control device 2 includes a calculation unit, a storage unit, an input / output interface, and the like (not shown), and various data and various calculation formulas input from the input unit 21 are stored in the storage unit. The calculation formula includes the following formula (1) for calculating the abnormal tension reference value of the warp and the following formula (2) for comparing the presence / absence of the abnormal tension of the warp, and calculates the abnormal tension reference value and the abnormal tension of the warp. The presence / absence of this is performed by the calculation unit of the control device 2 based on the input detection signal.
Abnormal tension reference value = Warp tension during trial operation x Constant (1)
Warp tension ≧ Abnormal tension reference value (2)

  As the warp tension at the time of trial operation in the formula (1), the warp tension detected by the load cell 19 at the time of test operation after the machine work is used. Here, the trial operation is intended for all operation states including the following operations performed before the start of the operation of the loom after the machine work. That is, a continuous operation of the loom for moving the warp seam to the woven fabric winding side by operating the forward rotation inching switch 24 and a continuous operation of the loom for checking the weft insertion operation by operating the normal rotation inching switch 24 are performed. Examples include a weft insertion operation check operation, adjustment of each part of the loom by operation of the normal rotation inching switch 24 or the reverse rotation inching switch 25, and intermittent inching operation for other adjustments. The constant of the formula (1) is determined experimentally and empirically based on the machine specification corresponding to the type of fabric. Further, the abnormal tension reference value calculated in the equation (1) is automatically stored and set in the storage unit of the control device 2, but the operator manually inputs and sets the input means 21 by looking at the calculation result. A method is also possible. The warp tension in the formula (2) is the warp tension detected by the load cell 19 during the operation of the loom.

Based on the above configuration, the warp abnormal tension detecting method in the present embodiment will be described with reference to the flowcharts of FIGS.
In FIG. 2, the operation operation of the currently set fabric is performed, and when the weaving of the predetermined length of the fabric is completed, the loom is stopped. The cross roller 13 around which the woven fabric is wound is removed by an operator or an automatic machine, and a new cross roller is mounted at the winding position. Next, when weaving a new fabric using a warp different from the warp of the fabric that has been set up until now, the machine work of exchanging the warp beam 4 and the new warp beam and connecting the new warp and the old warp is performed. Done. When the machine work is completed, the operator operates the input means 21 to input the fabric type, the weaving conditions including the warp tension, or select various data displayed on the display (not shown) of the function panel 20. Set in the storage unit of the control device 2. When the setting of the weaving conditions is completed, the operator operates the forward rotation inching switch 24 or the reverse rotation inching switch 25 to perform a trial operation. The load cell 19 constituting a part of the warp tension detection mechanism performs the warp tension detection operation even during the trial operation, and detects and outputs the warp tension during the trial operation when the loom is operated. The control device 2 calculates and stores the warp abnormal tension reference value using the formula (1) set in the storage unit based on the maximum value of the warp tension among the input warp tension signals during the trial operation. Set the part. When the setting of the abnormal tension reference value is completed, the loom is once stopped and preparation for starting is made, and then the operator operates the start switch 22 to start the operation of the loom. The operations of stopping the loom, preparing for starting the loom, and starting the operation of the loom can be performed manually by the operator or automatically by the control device 2.

  The operation shown in the flowchart of FIG. 3 is performed during the operation of the loom for weaving a new fabric. That is, the load cell 19 always detects and outputs the warp tension. The control device 2 compares the warp tension input at a predetermined timing during one rotation of the loom with the abnormal tension reference value according to the equation (2), and determines whether or not the warp tension has reached the abnormal tension reference value. When the warp tension does not reach the abnormal tension reference value, the operation of the loom continues, but when the warp tension reaches the abnormal tension reference value, the control device 2 immediately sends a stop signal to the loom drive motor 1 and the warp feed motor 3. And stop the loom. At the same time, the operator is notified of the fact that the loom has stopped due to the occurrence of a warp tension abnormality by using a lamp, a buzzer, a display on the function panel 20, or another alarm device. The operator recognizes the alarm, adjusts the loom that has stopped, repairs the cause of the warp tension abnormality, and operates the start switch 22 to resume the operation of the loom. If the cause of the warp tension abnormality cannot be resolved at an early stage, the operation of the loom will be stopped and other countermeasures will be considered.

The above-described embodiment of the present invention has the following effects.
(1) Since the warp tension during the trial operation of the new fabric is detected during the trial operation before the operation of the loom, and the abnormal tension reference value is calculated and set based on the warp tension during the trial operation, the optimum weaving for the new fabric An appropriate reference value that meets the conditions can be set, and unnecessary loom stop operation does not occur. In particular, an unnecessary stop immediately after the operation of the loom can be prevented.
(2) Implementation is easy without adding a special configuration.
(3) Since the abnormal tension reference value is calculated and set based on the maximum value of the warp tension during the trial operation, it is possible to eliminate the problem that the loom stops due to the warp tension within the appropriate range of the new fabric.

  The present invention is not limited to the configuration of each of the embodiments described above, and various modifications are possible within the scope of the gist of the present invention, and can be implemented as follows.

(1) In the calculation of the abnormal tension reference value in the above embodiment, the maximum value of the warp tension at the time of trial operation detected during the trial operation was used, but the average value of the warp tension at the time of test operation detected a plurality of times or many times was used. It may be used. With this configuration, even if there is a warp tension that occurs infrequently, it is averaged, and an abnormal tension reference value suitable for a new fabric can be set.
(2) In the above embodiment, the comparison between the abnormal tension reference value and the warp tension during the operation of the loom is performed every time the warp tension is detected by the load cell 19, but the warp tension detected multiple times or many times is detected. You may carry out by an average value and may carry out by a moving average value.
(3) In the above embodiment, as shown in FIG. 2, the method for detecting abnormal warp tension has been described with an example in which a new woven fabric is set. However, only the cross roller 13 is replaced and the warp beam 4 remains the same. Even if it is used, the present invention can be implemented. Accordingly, the machine work in the present invention includes a case where only the cross roller 13 is replaced, and the trial operation includes an operation in the normal rotation direction for winding a part of the woven fabric cut around the new cross roller, Includes a fabric woven after the cross roller 13 is replaced. In this embodiment, the weaving conditions set in the control device 2 are not changed between the old fabric and the new fabric, but the abnormal tension reference value is newly set based on the warp tension during the trial operation of the fabric after the machine setting. Therefore, more accurate control can be expected.

It is the schematic which shows the whole loom. It is a flowchart at the time of the setting of an abnormal tension reference value. It is a flowchart at the time of the abnormal tension detection during operation driving | operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Loom drive motor 2 Control apparatus 3 Warp sending motor 6 Tension roller 14 Tension lever 17 Detection lever 19 Load cell 20 Function panel 21 Input means 22 Start switch 23 Stop switch 24 Forward rotation inching switch 25 Reverse rotation inching switch 26, 27 Rotary encoder

Claims (3)

In a loom equipped with a dedicated warp feeding motor, a warp tension detecting mechanism and a control device for them, provided separately from the loom drive motor,
After the completion of the machine work, weaving conditions including warp tension are set, a trial operation of the loom is performed based on the weaving conditions, and based on the warp tension during the trial operation detected by the warp tension detection mechanism during the test operation. An abnormal tension reference value of the warp is calculated and set in the control device, and the warp tension detected by the warp detection mechanism during the subsequent operation of the loom is compared with the abnormal tension reference value. A method for detecting abnormal warp tension in a loom, wherein the loom is stopped when an abnormal tension reference value is reached.   The warp abnormal tension detection method for a loom according to claim 1, wherein the abnormal tension reference value of the warp is calculated based on a maximum value of the warp tension during the trial operation.   The warp abnormal tension detection method for a loom according to claim 1, wherein the abnormal tension reference value of the warp is calculated based on an average value of the warp tension during the trial operation.

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