JPH0782620A - Draw-false-twister - Google Patents

Abstract

PURPOSE:To provide a draw false-twister capable of reutilizing a yarn of an end-broken spindle by evaluating the yarn quality of a small package of the end-broken spindle. CONSTITUTION:This draw false-twister has a central control unit 26 provided with a means 1 for judging the end breakage, a means for evaluating the deviation of the detwisting tension T2 from a standard value until the end-breakage by comparing with the standard value and a displaying means 26a to display the evaluation result of the end-broken small package. The history of the detwisting tension of the end-broken small package is scrutinized, the extent of the deviation from the standard value used as a criterion of the quality evaluation is classified by the classification of defects and the frequency of the defect per unit length of the yarn is evaluated and displayed to enable the judgment of the reusability and the reusable level of the yarn by an operator based on the display at the manual doffing operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn tension sensor used for measuring the untwisting tension of a drawing false twisting machine using a belt type false twisting device or the like.

[0002]

2. Description of the Related Art First, the construction of a draw false twisting machine using a tension sensor will be described with reference to FIG. The filament yarn Y is pulled out from the yarn supplying package P1 and introduced into the primary heater H1 from the first feed roller F1. The filament yarn Y discharged from the heater H1 enters the belt type false twisting device NT via the balloon control plate BC, further passes through the second feed roller F2, the secondary heater H2 and the third feed roller F3 and is wound around the winding package P2. It is formed. The twist formed by the belt type false twisting device NT propagates to the first feed roller F1 and is thermally fixed by the primary heater H1.
That is, the upstream side of the belt type false twisting device NT is the twisting side, and the downstream side is the untwisting side. In the draw false twisting machine, such a unit is regarded as one weight, and a large number of the weights are arranged in the thickness direction of the paper.

The doffing of such a draw false twisting machine uses a heater H1.
Between the heater H2 and the heater H2 is automatically performed by an auto doffer AD that can travel in the thickness direction of the paper. Also, doffing is performed by sequential doffing rather than random doffing.
First, the auto doffer AD cuts and sucks the yarn reaching the winding package P2, while transferring the winding package P2 to a conveyor device (not shown) and mounting an empty paper tube,
Furthermore, the yarn is passed to the empty paper tube.

The automatic doffer AD can operate with respect to a weight that is normally wound up, but does not operate with respect to a weight with a yarn breakage occurring, and passes. for that reason,
The yarn breakage weight is detected by a filler or a tension sensor, the belt nip of the belt type false twisting device NT is released, and if necessary, the cradle arm of the winding package is flipped up to wait for the operator to recover.

Further, the drawing false twisting machine using the belt type false twisting device NT can add a high twist number of false twists at a high speed, but requires monitoring for maintaining stable operation.
For this monitoring, a tension sensor is arranged on the downstream side of the belt type false twisting device NT, the untwisting tension is measured, and the belt type false twisting device N is set so that the untwisting tension falls within a predetermined control range.
By adjusting the nip force of T, the history of the untwisting tension has been recorded.

[0006]

By the way, the small ball package before full winding remains on the thread breakage weight.
This small package was discarded as a defective product. However, not all the yarns up to the yarn breakage have defects to be discarded, and even if the yarns can be effectively used, it is not possible to determine the presence or absence of defects and they are discarded wastefully. There was a point.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to evaluate the quality of the yarn of the small ball package of the yarn breakage weight and to reuse it. The present invention is intended to provide such a drawn false twisting machine.

[0008]

Means for Solving the Problems A drawing false twisting machine that achieves the above object is a means for judging a yarn breakage and a deviation from a reference value by comparing a twisting tension value until the yarn breakage with a reference value. It has a central control device provided with a means for evaluating the degree of the thread per predetermined length of thread and a means for displaying the evaluation of the broken ball package.

[0009]

[Function] Looking back on the history of the untwisting tension of the broken small package, the degree of deviation from the standard value, which is a measure of quality evaluation, is distinguished by the defect classification, and the occurrence rate of this defect is evaluated for each predetermined length of yarn. It is possible to judge whether the operator can re-use or at what level the operator can re-use the manual operation based on the display.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart of a central control device of a drawing false twisting machine of the present invention, FIG. 2 is a graph showing how to divide defects by untwisting tension, and FIG. 3 is a flow chart of manual doffing of a small ball package.

In step # 1 of FIG. 1, it is determined which weight has caused the yarn breakage. This yarn breakage can be judged by the yarn absence signal of the filler for each weight or the output value of the tension sensor described below becoming almost zero. When the yarn breakage occurs, the untwisting tension data from the start of winding to the yarn breakage is called from the storage medium in which the output value of the tension sensor is recorded in step # 2, and is used as the data for determining the degree of the defect. Step # 3 compares the recalled data with a second threshold value (reference value) as a control limit,
At 4, the portion exceeding the second threshold value (reference value) is classified into long and short defects. The method of comparison and division will be described with reference to FIG. In FIG. 2, the deviation from the set untwisting tension is shown by the yarn length. The belt contact pressure of the false twisting device is adjusted so that the normal control limit is within the range of + a to -a. However, in the case of jumping out of this control limit, how it deviates from the separate control limit (reference value) + b to -b is classified into short or long as shown in the figure in relation to the yarn length. The control limit and the control limit (reference value) can be matched.

The frequency of occurrence of this short or long defect is converted into a unit yarn length (for example, 1 km) (step #
5) Then, the grade is determined by comparing this defect occurrence frequency with a table separately determined for each yarn type. This grade is determined in order of goodness, such as grade 1, grade A, grade A, grade C, so that class information up to the time of thread breakage, such as reusable grade A1, can be obtained. (Step # 6). As for this grade information, the weight number and its grade are displayed on the display panel of the central controller (step # 7). It should be noted that, in the case of a normal full-wound package in which no yarn breakage occurred in step # 1, normal evaluation is performed (step # 8), and the weight number and grade can be stamped on a printer and recorded (step). # 9).

By the way, since the auto doffer passes the small ball package that is broken, it is necessary for the operator to manually restore it. The procedure will be described with reference to the flowchart of FIG. First, when the timing for forming a full-roll package is reached, automatic sequential doffing by the auto doffer is started (step # 11). However, since the automatic doffer passes the small ball package with a thread break, if you dodge manually before and after this passing timing,
The doffing is sequentially restored (step # 12). It should be noted that the presence of the small ball package to be doffed manually is displayed in the operator room so that the operator can know. Then, the grade of the small ball package is displayed on the central control unit provided at the end of the machine base as shown in FIG. 2 (step # 13), and the grade is reused according to the grade (step # 1).
4).

Next, an untwisting tension control system for the whole draw false twisting machine equipped with a T2 monitor as a central control unit for controlling the flow chart of FIG. 1 will be described. The draw false twisting machine 50 has 1 to 216 spindles (SP) in the illustrated example, forms spans every 12 spindles, and there are 18 spans in total.
Then, for each span, the feedback controller 20
12 based on 12 tension sensors 1
The belt type false twisting device 55 is controlled via the air controller 21. Each feedback controller 20
Is connected to the monitor 26. This monitor 26 has a printer 27 and an operating device 28, sets an appropriate untwisting tension T2 through the operating device 28, and adjusts the belt type false twisting device 55 with the tension sensor 1 provided for each weight. , Maintain a predetermined untwisting tension T2. Printer 2
The actual untwisting tension T2 of each weight is recorded in 7, and the operator regularly confirms the data of the printer 27. From the abnormal value of the untwisting tension T2, the failure of the primary heater or the belt of the belt type false twisting device is detected. The wear of can be known at an early stage. Further, the grade of a normal winding package can be printed on the printer 27 or can be confirmed on the liquid crystal screen of the monitor. Further, the monitor 26 may be provided with an alarm device together with the printer 27.

A display example of the class of the small package on the liquid crystal panel 26a of the monitor 26 will be described. For example, if thread breakage occurs at the weight number 4, the class of the small package is displayed at A4 as A1. For the weight, the untwisting tension T2 during winding is
Is displayed as a number that changes from moment to moment. The operator can manually check the grade of the doffed bead package by looking at the monitor 26.

Further, the main part of the drawing false twisting machine provided with a tension sensor for constantly monitoring the untwisting tension will be described with reference to FIG. In order to measure the untwisting tension T2 on the downstream side of the belt type false twisting device 55, the tension sensor 1 is provided at the bent portion of the yarn between the belt type false twisting device 55 and the second feed roller 54.
Is provided. In the belt type false twisting device 55,
Two endless belts B1 and B2 each having two pulleys 5
The belts B1 and B2 are wound around 5a and 55b and are provided so as to intersect each other as shown in the drawing. The pulley 55
One of the pulleys 55a and 55b is a drive pulley driven by the tangential belt 55c, and the other pulley 55b is a driven pulley that is driven and rotated via the belts B1 and B2. The yarn Y is nipped at the point N at the intersection of the two belts B1 and B2, and the belts B1 and B2 travel in the opposite directions so that the yarns Y are fed downward and simultaneously subjected to a twisting action. In order to apply a predetermined nip pressure to the yarn Y, one belt B2 side has its position fixed, and the other belt B1 side can be swung with the driven pulley 55b around its driving pulley 55a as a center. B
It is performed by pressing and urging in two directions. And
In order to fix the nip point N, thread guides 64 and 65 are provided. The yarn guide 64 has a slit guide hole 64a at the tip of the arm, and the guide hole is located in the vicinity of the nip point N. The yarn guide 65 has a drum shape so that the reciprocating movement of the yarn by the traverse guide 54c described below does not affect the nip point. Second
The feed roller 54 includes the roller 54a and the apron belt 5.
4b combination. Then, the second feed roller 54
Traverse guide 5 that reciprocates in the thickness direction of the paper at the entrance of
4c, roller 54a and apron belt 54b
Extend the life of.

The above-mentioned belt type false twisting device 55 nips the yarn Y between the belts which intersect and run in opposite directions, and twists the yarn to obtain a processed yarn of a predetermined quality. The tension T1 and the untwisting tension T2 need to be appropriately maintained. Therefore, the untwisting tension T2 is constantly monitored by the tension sensor 1. The output of the tension sensor 1 enters the feedback controller 20, and when it deviates from the predetermined yarn tension, the nip pressure of the belt type false twisting device 55 is adjusted via the air controller 21 to control to keep the predetermined untwisting tension T2. Done.

[0018]

EFFECT OF THE INVENTION The drawing false twisting machine of the present invention looks back on the history of the untwisting tension of a broken ball-shaped package and distinguishes the degree of deviation from the reference value, which is a measure of quality evaluation, by the defect classification. The rate of occurrence is evaluated and displayed for each predetermined length of thread, and it is possible to judge whether it can be reused or at what level based on the display at the time of manual doffing by the operator. The Kodama package that had been used can be used effectively.

[Brief description of drawings]

FIG. 1 is a flow chart of a central control device of a drawing false twisting machine of the present invention.

FIG. 2 is a graph showing how to divide defects by untwisting tension.

FIG. 3 is a flow diagram of manual doffing of a small ball package.

FIG. 4 is an untwisting tension control system diagram of a drawing false twisting machine.

FIG. 5 is a side view showing a structure in the vicinity of a tension sensor of the drawing false twisting machine.

FIG. 6 is a device configuration diagram of a drawing false twisting machine.

[Explanation of symbols]

 1 Tension sensor 26 T2 monitor (central control unit)

Claims (1)

[Claims] 1. A means for judging a yarn breakage, a means for comparing the untwisting tension value up to the yarn breakage with a reference value and evaluating the degree of deviation from the reference value per predetermined length of the yarn, A drawing false twisting machine having a central control unit provided with means for displaying the evaluation of a broken small package.