JPH0647019Y2 - Yarn drawing false twisting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a draw false twisting machine for a yarn having a large number of draw false twisting units for continuously performing twisting, heat setting and untwisting, and particularly, The present invention relates to a yarn drawing false twisting machine provided with a quality control device for performing quality control.

[Conventional technology]

First, the device configuration of a draw false twist unit in a draw false twist machine for this type of yarn will be described with reference to FIG. In FIG. 5, a pair of left and right symmetrical false-twisting units are arranged in the thickness direction of the paper in a plurality of weights (for example, 216 weights). The equipment configuration of one weight is as follows. The yarn 50 is held by the first feed roller 51 and the second feed roller 52 at a yarn tension capable of being stretched. These two sets of feed rollers
A false twisting device 53 such as a nip twister is provided on the downstream side between 51 and 52. By this false twisting device 53, the yarn 50 up to the feed roller 51 is in a twisted state. Further, a heat fixing heater 54 is provided on the upstream side between these two sets of feed rollers 51 and 52. Since this heater 54 heats and fixes the twist of the drawn yarn, a heater of a type that heats the yarn while bringing the yarn into contact with a hot plate whose temperature is accurately controlled by Dowsome steam or the like is adopted. A third feed roller 55 is further provided after the second feed roller 52. A secondary heater 56 is provided between these two sets of feed rollers 52 and 55. This secondary heater 56 reheats the yarn after the bulking process to reduce the elasticity and leaves only the bulkiness, and is used as necessary. FIG. 6 is a perspective view showing details of the nip twister false twisting device 53. The thread 50 is completely nipped by two special twister belts 53A,
It is twisted without slip between the 3A and the yarn 50. That is, the force acting on the yarn 50 is divided into the twist component VT and the feed component VF, and VT and VF are determined by the crossing angle Θ of the twister belt 53A.

The draw false twisting machine having the above-described structure has a draw ratio DR which is a speed ratio between the first and second feed rollers 51 and 52, a crossing angle Θ of the twister belt 53A, and a feed component of the twister belt 53A.
VF-dependent speed ratio VR, heating temperature H1 of heater 54, heating temperature H2 of secondary heater 56, second and third feed rollers 52,
By setting the processing conditions such as the overfeed rate OF2, which is the speed ratio between 55, and the overfeed rate OF3, which is the speed ratio between the third feed roller 55 and the winding device 57, to the desired finished yarn for the first time. Can be processed. Also, these processing conditions DR, Θ, VR, H1, H2, OF2, OF3 are not constant, and POY
(PARTIAL ORIENTED YARN) Denier DE, POY processing speed YS, and the number of twists TPM that determines the desired crimpability. Therefore, the processing conditions of this type of false-twisting machine are generally determined by test processing. Then, as a result of the actual operation, the quality of the processed yarn is checked, and which quality (fluff, untwisted yarn, broken yarn, crimpability) and how insufficient is determined (for example, there are many fluffs). etc). Then, for example, when there are many fluffs, the processing conditions (DR, VR) that have the greatest influence are adjusted. Once adjusted, the processing conditions are maintained.

[Problems to be solved by the device]

In the drawing false-twisting machine for yarn drawn by the conventional technique, the processing conditions DR, Θ, VR, H1, H2, OF2, OF3 are controlled to be constant, which directly affects the quality of the yarn. Tension fluctuations, yarn temperature fluctuations, yarn speed fluctuations, etc. are not monitored,
There was a problem that quality abnormalities were not discovered until the sampling inspection of the product, and early countermeasures against the abnormalities could not be taken.

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 detect an abnormal yarn quality early by adding a simple device. The present invention is intended to provide a yarn drawing false twisting machine capable of producing a yarn.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the yarn drawing false twisting machine in the present invention is a yarn drawing false twisting machine equipped with multiple weights of a false false twisting unit in which a false twisting device and a heater are arranged between a pair of feed rollers. A temperature detection sensor embedded in the whole weight of a specific fixed guide on the downstream side of the heater where the yarn travels frictionally, and a means for comparing the temperature data from the temperature detection sensor between the weights to obtain a deviation, A quality control device including means for detecting and displaying a weight having a large deviation is provided.

[Action]

By measuring the temperature of the fixed guide on which the processed thread frictionally travels with all the weights and comparing between the weights, it is possible to determine which of thread tension fluctuations, thread temperature fluctuations, thread speed fluctuations, etc. that greatly affect the quality of the thread. It is possible to detect in advance that an abnormality has occurred in a specific weight.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a state where a thermocouple S as a temperature detecting sensor is embedded in the fixed guide 1. This fixed guide 1 is, for example, a ceramic bar, and a thermocouple S is embedded in the position where the yarn Y runs at the center thereof. Then, the yarn Y frictionally travels around the outer circumference of the fixed guide 1, the temperature of the entire fixed guide 1 rises due to frictional heat, and the temperature is measured by the thermocouple S. The location where the fixed guide 1 is attached to the drawing false twisting machine will be described. In FIG. 5, the secondary heater 56 and the third heater
The fixed guide 1A between the feed roller 55 and the fixed guides 1B and 1C between the third feed roller 55 and the winding device 57 are suitable. If the fixed guide at this position is where the processed thread comes into contact, and if there is any abnormality such as fluctuation in thread tension, fluctuation in thread temperature or fluctuation in thread speed, the degree of frictional heat will also change and the temperature of the fixed guide will change. Is changed. Further, the fixed guide in which the thermocouple is embedded is set to the same condition for each weight, and a fixed guide with a thermocouple is provided on all weights. The temperature detection sensor is not limited to a thermocouple, but a thermistor, a posistor, or the like can be used.

Next, the quality control device using a fixed guide with a thermocouple will be described with reference to FIG. In FIG. 2, each of the drawn false twist units U1 to U216 is provided with thermocouples S1 to S216, and the temperature data of the thermocouples S1 to S216 are sequentially taken in via the multiplexer 2. By using this multiplexer 2, it is sufficient to use only one drawing false twisting machine as a whole after that, and it is possible to use an existing one. Then, the temperature data is input to the microcomputer 5 via the amplifier 3 and the A / D converter 4. The result of data processing by the microcomputer 5 is output to the display device 7 via the D / A converter 6. The weight selection device 8 operates the multiplexer 2 according to an instruction from the microcomputer 5.

Next, data processing in the microcomputer 5 will be described with reference to FIG. First, temperature data from each weight is sequentially read through the multiplexer (block). The temperature data is not a single point, but the temperature data of each weight may be read several times at predetermined time intervals, and the average of the temperature data of each weight may be used as the temperature data of each weight.
Next, the average temperature is calculated from these temperature data (block). This average temperature is usually obtained for all spindles, but it is also possible to obtain the average for a specific group, for example, for every 12 spindles. Next, the deviation value of the temperature of each weight is calculated based on this average temperature (block).
This deviation value is not limited to the difference from the average value, but may be a standard deviation value, for example. Next, it is judged whether this deviation value is within the standard (block). If it is within the reference, the block is repeated again after a predetermined time T has passed (block). If the weight deviates from the standard, the weight is displayed as an abnormal weight (block). An example of detecting an abnormal weight by the above data processing will be described with reference to FIG. FIG. 4 shows six weights for convenience. The time t is the time when the multiplexer sequentially reads the temperature data, but it is shorter than the time when the temperature changes and is a time that can be ignored in the calculation even in the case of 216 spindles. Then, the temperature data is read at every constant time T. For example, in the Nnth measurement, the deviation value of the weight of NO.3 is displayed as an abnormal weight, and in the Nmth measurement,
The deviation value of the weight of O.5 is large and it is displayed as an abnormal weight. As a way of displaying this, when the alarm lamp lights up,
Some display the weight number on the control panel. Then, the operator can check what is abnormal by inspecting the abnormal weight and take necessary measures.

[Effect of device]

The yarn drawing false twisting machine in the present invention is a yarn drawing false twisting machine provided with a plurality of weights of a drawing false twisting unit in which a false twisting device and a heater are arranged between a pair of feed rollers. A temperature detection sensor embedded in the whole weight of a specific fixed guide on which the thread travels by friction, a means for comparing the temperature data from the temperature detection sensor between the weights to obtain a deviation, and detecting a weight with a large deviation. A quality control device consisting of a means for displaying is provided, and it is possible to confirm in advance that some abnormality such as fluctuations in thread tension, fluctuations in thread temperature, fluctuations in thread speed, etc., that greatly affect the quality of the thread, has occurred in a specific weight. Can be detected and early countermeasures can be taken. Furthermore, since the temperature detection sensor is only embedded in the fixed guide that originally exists in each weight, and since it is comparative management between weights, it is sufficient to have one expensive measuring device for the entire drawing false twisting machine, which is inexpensive as a whole. It can be a quality control device.

[Brief description of drawings]

FIG. 1 is a view showing a temperature detection sensor embedded in a fixed guide, FIG. 2 is a block diagram of a quality control device, FIG. 3 is a flow chart showing data processing of a microcomputer, and FIG. 4 is a temperature for each weight. FIG. 5 is a graph showing an example of data, FIG. 5 is a device configuration diagram of a draw false twisting machine, and FIG. 6 is a perspective view showing a twister belt false twisting device. 1 ... Fixed guide, S ... Thermocouple (temperature detection sensor), U1 to U216 ... Stretching false twisting unit, 51 ... First feed roller, 52 ... Second feed roller, 53 ... Stretching false twisting device , 54 ... heater.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A yarn drawing false twisting machine comprising a plurality of weights of a drawing false twisting unit in which a false twisting device and a heater are arranged between a pair of feed rollers, and a yarn is frictionally run downstream of the heater. Of the fixed guide, a temperature detecting sensor embedded in the whole weight, means for comparing the temperature data from the temperature detecting sensor between the weights to obtain a deviation, and means for detecting and displaying a weight having a large deviation. A yarn false-twisting machine, which is equipped with a quality control device.