JP2001048423A - Yarn breakage position detecting method and measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the part of a process of a yarn breakage by detecting the occurrence of a yarn breakage in a designated section of a running yarn, detecting passing of the end of a broken yarn in a reference position downstream from the designated section, and measuring the yarn breakage occurrence position from the reference position. SOLUTION: A tension detector 11 for measuring yarn tension of a yarn processing area is provided between a frictional false twister 6 and a delivery roller 7, and a yarn detector 12 for detecting passing of the end of a broken yarn in a reference position is provided in a designated position which is a reference position between guide rollers 2 immediately before winding. A tension signal form the tension detector 11 is largely lowered simultaneously with the occurrence of a yarn breakage, and a time yarn breakage occurrence signal is generated according to the level change. When a passing signal is output as a stepwise signal from the yarn detector 12 when the end of a broken yarn passes a reference position. The amount of time elapsed from the time when a yarn breakage occurrence signal is generated to the time when a passing signal is generated is measured to measure the yarn breakage position from the reference position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn breakage position detecting method and a measuring device for measuring a yarn breakage occurrence position in various fiber machines, fiber manufacturing processes and the like.

[0002]

2. Description of the Related Art As is well known, a process for producing synthetic fibers, specifically, a process for producing a processed yarn of long fibers, includes processes such as drawing and false twisting. Various processing equipment such as guides, rollers, heaters, false twisting disks, etc. are arranged, and the yarn is run to continuously produce. In such a process, usually, a yarn break detector for detecting a yarn break of the yarn is provided immediately before the winding portion of each weight, and when a yarn break occurs, the supply of the yarn of the weight is stopped. A yarn break management device that automatically performs appropriate yarn break processing is provided to manage the yarn break. As a result, the problem that the broken yarn end is wound around a roller or the like to increase the thickness and induce the breakage of the adjacent weight and the like is solved, and stable production is performed.

[0003]

By the way, in these processes, many of the above-described processing devices are arranged, and each of them causes a thread break. Therefore, the above-mentioned yarn breakage management device can identify the weight at which the yarn breakage occurs frequently, but the cause of the yarn breakage is so many that it cannot be immediately investigated. A number of packages that did not become products occurred frequently, and in short, the weight had to be stopped until regular maintenance of the machine stand, causing a problem that productivity was reduced. In recent years, as cost reduction has been greatly called out, there is a strong demand for a solution to the current situation.

[0004] An object of the present invention is to solve the present situation.
In order to clarify the cause of the yarn breakage at the time of yarn breakage, a method for detecting a yarn breakage position and a yarn breakage position capable of measuring a yarn breakage position which clarifies in which part of these processes a yarn breakage has occurred. It is an object of the present invention to provide a yarn position measuring device.

[0005]

The above object is achieved by the present invention described below. That is, the present invention detects the occurrence of a yarn break in a predetermined section of a traveling yarn, detects the occurrence of a yarn break in the predetermined section, and then downstream of the end of the yarn from the predetermined section. Detecting the passage of the thread from the reference position based on the time from the occurrence of the thread break to the passage of the reference position at the end of the thread from the reference position. In a yarn breakage position measuring device for detecting a yarn breakage occurrence position in a predetermined section of a running yarn suitable for carrying out this, a yarn breakage occurrence detecting means for detecting a time point at which the yarn breakage occurs in the predetermined section A thread end detecting means for detecting that the end of the thread passes a reference position downstream of the predetermined section; and Position detecting means for measuring the yarn breakage occurrence position from the reference position based on the time until the passage of Consisting of a yarn breakage position measuring device according to claim.

In the present invention, as is apparent from the above-described configuration, the time point of occurrence of the yarn breakage is detected, and the time until the yarn end of the yarn breakage at the predetermined reference position passes is detected. Specifically, from the time, the thread breakage position is determined as the distance from the reference position based on the time and the running speed of the yarn, so that not only the presence / absence of the conventional thread breakage but also the position of the yarn breakage occurrence can be detected. It is possible to specify which processing device caused the yarn breakage in the above-described process. Therefore, the position where the thread breaks frequently, that is, the processing device or the processing site where the thread breaks frequently can be specified, and the cause of the thread breakage and its countermeasures can be quickly investigated, and the above-mentioned problem can be achieved.

In the above-mentioned method of the present invention, the detection of the occurrence of the yarn breakage is performed if the occurrence of the yarn breakage can be immediately detected.
Although not particularly limited, a method of detecting by a fluctuation in the tension of the running yarn is preferable since a commercially available yarn tension detector can be used and stable online detection is possible. In addition, for example, the running state of the yarn is monitored by a photoelectric detector or the like at an appropriate place in a predetermined area where the running is stable, and the running state of the yarn is monitored by a CCD camera or the like. A configuration or the like that detects the change can be applied.

The detection of the passage of the end of the yarn at the reference position is not particularly limited as long as the passage can be detected. A method of detecting the presence or absence of a running yarn at the reference position is a commercially available cutting method. A yarn detector or the like can be used as it is, which is preferable in terms of stable detection and cost.

In the above-mentioned device of the present invention, the yarn breakage detecting means can be applied as long as it can detect the time point at which the yarn breakage occurs. However, a tension detector for detecting the tension of the running yarn in the predetermined section is provided. , A configuration that includes a thread breakage occurrence determination unit that determines that thread breakage occurs when an output signal from the tension detector fluctuates by a predetermined value or more can apply a commercially available detector to the detector, and stabilize detection.
It is preferable from the viewpoint of cost. In addition, for example, the running state of the yarn is monitored by a photoelectric detector or the like at an appropriate place in a predetermined area where the running is stable, and the running state of the yarn is monitored by a CCD camera or the like. A configuration or the like that detects the change can be applied. The thread break end passage detecting means can be applied as long as it can detect the passage of the end portion, but for the same reason, a yarn detector for detecting the presence or absence of a running yarn at the reference position is preferable.

Further, the position detecting means can be applied as long as the position of occurrence can be specified appropriately according to the purpose. However, the running yarn is detected during the elapsed time from the time of the yarn breakage to the passage of the end of the yarn through the reference position. It is preferable from the viewpoint of versatility and cost to determine the yarn breakage position from the reference position based on the yarn length obtained by multiplying the running speed of the strip. It should be noted that, since the yarn breakage position can be accurately detected, the measured value of the yarn length is corrected by the elongation of the yarn due to the tension of the running yarn before the yarn is broken to obtain the yarn length during running. Is preferably set as the yarn break generation position from the reference position. However, if it is only necessary to be able to identify the processing device in which the yarn breakage has occurred in the above-described process, detection accuracy is not so required, and such a structure can be omitted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings, using embodiments applied to a false twisting machine. FIG. 1 is a block diagram showing the configuration of the yarn breakage position measuring device according to the embodiment. FIG. 2 is a flowchart of the yarn breakage position detecting means of this embodiment. FIG. 3 is an explanatory diagram of the measurement result of the example. FIG. 4 is an explanatory diagram of a false twisting machine to which the embodiment is applied.

The false twisting machine shown in FIG. 4 is disclosed in Japanese Patent Publication No. 62-12 / 1987.
The yarn Y from the original yarn package 1 is supplied from the feed roller 3 to the yarn processing area via the guide roller 2. The yarn processing area includes a first heater 4, a second heater 5, a false false twist device 6 having both a twisting action and a feeding action, and a delivery roller 7. While stretching the strip Y, twisting and heat setting are performed by both the first and second heaters, and untwisted by the friction false twisting device 6 to perform predetermined false twisting. The yarn Y from the delivery roller 7 is turned by the two guide rollers 2 and formed on the product package 8 by a winding machine (not shown).

As shown in the drawing, the false twisting machine includes a tension detector 11 for measuring the yarn tension in the yarn processing area as a yarn breakage detecting means for detecting the yarn breakage of the present invention.
Between the friction false twisting tool 6 and the delivery roller 7, a yarn detector 12 for detecting the presence or absence of a yarn is provided as a yarn end detecting means for detecting the passage of the yarn end at a reference position. It is provided at a predetermined position serving as a reference position between the rollers 2. The tension detector 11 is applicable as long as the tension of the yarn can be measured online. In this example, a commercially available yarn tension detector was used. As long as the yarn detector can also detect the presence or absence of the yarn, a commercially available yarn break detector can be applied as it is, and in this embodiment, a photoelectric break detector that can detect the yarn without contact is used. A capacitance type or the like can also be applied. It is preferable to provide a yarn guide for holding the yarn in order to stably detect the broken end portion and improve the detection accuracy.

FIG. 3 shows an example of actual measurement results by the tension detector 11 and the yarn detector 12 when a yarn break occurs. As shown in the figure, the tension signal T from the tension detector 11 is greatly reduced at the same time as the occurrence of the yarn breakage, and when the level changes to a certain level or less as shown in the figure, for example, a yarn breakage generation signal S is generated. The point of occurrence of thread breakage can be detected.

On the other hand, when the yarn end passes through the detecting portion, that is, the reference position, a passing signal B is output from the yarn detector 12 as a step signal as shown in the figure. The running speed of the yarn Y is determined by measuring the elapsed time L from the time when the yarn break generation signal S is generated to the time when the passage signal B is generated, so that the yarn breakage position P from the reference position is measured. You can.

That is, the point of occurrence of a yarn break in a predetermined section such as a yarn processing area is detected, and then the passage of the end of the thread at a reference position downstream of the predetermined section is detected. The yarn breakage position can be measured based on the elapsed time up to.

Therefore, the yarn breakage position detecting device of this embodiment is
As shown in FIG. 1, the tension detector 11 and the yarn detector 12
The following configuration is used to detect the yarn breakage position based on the output signal of (1). That is, the tension signal T from the tension detector 11 is filtered by the low-pass filter (LPF) 13 for high-frequency noise. The filtered tension signal T is input via a buffer circuit 14 to a comparator 15 which is a thread breakage judging unit, and is also input to a processing means 18 comprising a computer for monitoring the tension.

The comparator 15 compares the tension signal T with a preset reference level of the tension for judging a thread breakage from the processing means 18 and outputs a thread breakage generation signal S when the tension level falls below the reference level. This thread break generation signal S is input to a set terminal of a flip-flop circuit (F / F) 17 which is a timing signal generating means for generating a timing signal at the time of thread break generation and at the time of the thread break end passing the reference position. And F
/ F17 is set. The F / F 17 outputs a set signal synchronized with the time of thread breakage occurrence to the processing means 18.

On the other hand, the output signal of the yarn detector 12 is supplied to a F / F through a photocoupler 16 for electrical isolation of the signal.
It is input to the set terminal of F17. When the yarn detector 12 detects that there is no yarn, the end passage signal B is output as an output signal and is input to the set terminal of the F / F 17, so that the F / F
Reference numeral 17 indicates count 2, which is reset, and a reset signal is output to the processing means 18.

The processing means 18 has a program for the yarn breakage position detecting means shown in the flowchart of FIG.
In response to the set signal and the reset signal of No. 17, the yarn breakage position is detected as follows. That is, the yarn breakage position detecting means starts processing in synchronization with the start of the machine base. Then, it monitors whether the output of the F / F 17 is a set signal.
Then, when the tension falls below the reference level and the set signal is output, the measurement of the elapsed time L is started, and it is monitored whether or not the output of the F / F 17 becomes the reset signal.

In the present embodiment, the following reset means is provided so that even if the elapsed time L exceeds the upper limit value LH which is several times the elapsed time L required for the normal thread end to pass, the resetting means is not required.
If the output of the / F17 is not reset to the reset signal, the F / F17 is reset as no thread breakage, and it is monitored again whether the output of the F / F17 is a set signal.

When the output of the F / F 17 becomes a reset signal within the upper limit value LH, the running speed H ₀ and the tension T _{0 of} the yarn Y set in advance based on the elapsed time L at that time are represented by the following formula ( The thread length from the reference position, that is, the thread breakage position P is obtained by 1).

[0023]

P = P ₀ + (H ₀ × L−P ₀ ) × (1 + K × T ₀ ) (1) where P ₀ is a distance from the delivery roller 7 to the yarn detector 12 at the reference position. The distance, K, is the elastic modulus of the yarn Y. In the above equation, the tension of the running yarn downstream of the delivery roller 7 is substantially zero, and is obtained by ignoring the tension.

Next, the yarn breakage position detecting means performs a termination process such as displaying the data on the display of the yarn breakage position processing means 18 and storing data in a predetermined format for management.

The measurement of the yarn breakage position according to the present embodiment having the above-described configuration will be described with reference to the measurement results shown in FIG. As shown in FIG. 3, when the tension signal T from the tension detector 11 falls below the set reference level, the thread breakage generation signal S is output from the comparator 14, the F / F 17 is set, and stored in the processing means 18. The detected thread breakage position detecting means starts measuring the elapsed time L. Then, when a yarn break actually occurs and its end passes through the yarn detector 12 at the reference position, the yarn detector 12
A passing signal B shown in the figure is output, the F / F 17 is reset at a count of 2, and the yarn breakage position detecting means of the processing means 18 captures the elapsed time L at that time, and based on this, the traveling speed set in advance. Under the conditions of H ₀ , tension T _{0, and the} like, the thread breakage position from the reference position is calculated by the above-described equation (1).
It is displayed and stored in a predetermined format for management.
By this measurement, it was confirmed that the yarn breakage position P can be measured with sufficient accuracy to specify which processing device is the yarn breakage generation position.

By the way, even if there is a large decrease in the tension below the reference level, there is a case where the thread is not actually broken. In this embodiment, the following processing is performed by the reset means.
That is, when the end passage is not detected even when the elapsed time L from the time of the occurrence of the thread breakage due to the tension drop becomes equal to or more than the preset upper limit value LH, it is reset that no thread breakage occurs, and the normal thread break monitoring is performed. I am trying to return. In addition,
In this example, a good result was obtained by using 20 seconds as the upper limit value LH.

As described above, the present invention has been described with respect to one spindle for convenience of explanation, but it goes without saying that the present invention can be extended to management of multiple spindles.

In addition, an inexpensive microcomputer can be used as the processing means, which can be installed for each weight, is advantageous in signal transmission, and is suitable for managing multiple weights. Although an example has been shown, it is also possible to directly input the output of each detector to the computer of the processing means, and to process all of them by software.

Furthermore, construction speed required for the yarn breakage positions determined from simple point H _0, showed that manual setting in advance the processing means 18 the tension T _0, the tension T ₀ is the tension detector 11
The traveling speed H ₀ can be measured using a tension detector T and automatically set together with the tension signal T. This makes the configuration slightly complicated, but has the effect of preventing erroneous condition setting and simplifying the operation. As the traveling detector, one that detects the rotation speed of a roller such as a feed roller, one that detects the winding speed of a winding machine, or the like can be used.

As described above, it is apparent from the gist of the present invention that the present invention is not limited to the embodiments.

[0031]

As described above, the present invention realizes a method and an apparatus for measuring a yarn breakage position which can measure not only the presence / absence of a yarn breakage but also the occurrence position of a yarn breakage online. It greatly contributes to online analysis of thread breakage in a fiber manufacturing plant where the process is long and complicated. It has a great effect on production.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a yarn breakage position measuring device according to an embodiment.

FIG. 2 is a flow chart of a yarn breakage position detecting means of this embodiment.

FIG. 3 is an explanatory diagram of a measurement result of an example.

FIG. 4 is an explanatory diagram of a false twisting machine to which the embodiment is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Yarn package 2 Guide roller 3 Feed roller 4, 5 Heater 6 Friction false twisting device 7 Delivery roller 8 Product package 11 Tension detector 12 Thread detector 15 Comparator 17 Flip-flop circuit 18 Processing means

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Mitsumasa Sasaki 77 Kitayoshida-cho, Matsuyama-shi, Ehime Pref. NN04 NN12 QQ05 QQ07 3F115 CA06 CA14 CA18 CB02 CB08 CC23 CC24 4L036 AA01 PA05

Claims (9)

[Claims] When measuring the occurrence position of yarn breakage in a predetermined section of a traveling yarn, the occurrence of breakage in the predetermined section is detected, and then the end of the yarn breakage downstream of the predetermined section is measured. A thread breakage position detection method, comprising detecting passage of a reference position, and measuring a thread breakage occurrence position from the reference position based on a time from the occurrence of thread breakage to the passage of the end portion of the thread through the reference position. 2. The yarn breakage position detecting method according to claim 1, wherein the occurrence of a yarn breakage is detected by a change in tension of the running yarn. 3. The yarn breakage position detecting method according to claim 1, wherein the passage of the end of the yarn break through a reference position is detected by the presence or absence of a running yarn at the reference position. 4. A yarn breakage position measuring device for detecting a yarn breakage occurrence position in a predetermined section of a traveling yarn, comprising: a yarn breakage occurrence detecting means for detecting a time point at which the yarn breakage occurs in the predetermined section; Yarn break end passage detecting means for detecting that the end of the yarn passes a reference position downstream of the predetermined section; and A yarn breakage position measuring device, comprising: a position detecting means for measuring a yarn breakage occurrence position from a reference position based on time. 5. The thread breakage detecting means for detecting a tension of a running yarn in the predetermined section, and a yarn breakage when the output signal from the tension detector fluctuates by a predetermined value or more. 5. The yarn breakage position measuring device according to claim 4, further comprising a yarn occurrence determining unit. 6. A yarn detector for detecting the presence or absence of a running yarn at the reference position, wherein the yarn end detecting means is a yarn detector.
Or the yarn breakage position measuring device according to 5. 7. The reference position based on a yarn length obtained by multiplying an elapsed time from the time of occurrence of a yarn break to the passage of an end of the yarn through a reference position by a traveling speed of a traveling yarn. The yarn breakage position measuring device according to any one of claims 4 to 6, which is a means for calculating a yarn breakage position from the thread. 8. The running position detecting means corrects the measured value of the running length with the elongation of the running yarn due to the tension of the running yarn before breaking to determine the running yarn length. The yarn breakage position measuring device according to claim 7, wherein the yarn breakage position is a yarn breakage occurrence position from the position. 9. A system according to claim 4, further comprising resetting means for resetting the occurrence of thread breakage when the time from when the thread break occurs to when the end of the thread passes through the reference position is equal to or greater than a predetermined value.
9. The yarn breakage position measuring device according to any one of items 8 to 8.