JPS5865063A - Detection of feather - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluff detection method, and an object of the present invention is to accurately detect minute fluff that could not be removed conventionally during warping, weaving and knitting of woven or knitted fabrics, and to easily remove minute fluff. purpose.

In recent years, there has been remarkable progress in high-speed looms such as water jet looms and air jet looms, and along with rationalization of warp threads, there is an increasing demand for fluff-free warp threads, which previously did not pose problems due to warp sizing, low-speed operation, etc. Micro fluff is a problem.

On the other hand, from the perspective of the raw yarn material, there is a strong demand for a fluff detection method that can remove minute fluff due to the appearance of yarn with extremely fine fineness 41.

In the conventional two-fuzz detection method, it is not possible to distinguish between raw yarn fuzz and yarn vibration, so when the sensitivity of the detection unit is increased, the yarn vibration stops due to 1FIK, and minute fuzz cannot be removed. The reality is that the beam cannot be obtained.

In the present invention, the conventional fuzz detection method converts the amount of light interruption due to fuzz, vibration, etc. into voltage and detects the absolute value of the amplified voltage, so it is possible to distinguish between voltage changes due to fuzz and vibration. If this is not possible, and the detection sensitivity is increased, the voltage signal due to vibration and the voltage signal due to micro fluff will become approximately equal.
Focusing on the fact that it stops (running idle) due to vibration and cannot detect minute fuzz, the signal detected by the photoelectric detection method of yarn fuzz is converted into a voltage signal, amplified, integrated, and compared with the signal caused by yarn vibration, etc. It is designed to detect fluff by sorting and removing noise signals such as vibration signals.

The present invention will be described below based on drawings showing an example of implementation. Fig. 1 is a model diagram obtained by converting the fiber fuzz and vibration into voltage using an oscilloscope. The voltage signal fluctuation curve due to vibration and fuzz is expressed as t (t), f (t)
Also, if each maximum value is expressed as 1*VB, fluff can be detected by setting the detection sensitivity (level) between ^B vA and t/''B. However, in the case of minute fluff, the value of V is small, When the vibration becomes slightly higher, the values of ty,,17. become approximately equal, and the appropriate range of detection sensitivity becomes extremely narrow. Size is limited. That is, 17. −L/”, = K, fluff detection becomes possible only when K>O.The present invention was made by focusing on the fact that there is a clear difference in the voltage fluctuation curve due to fluff on yarn vibration. It is.

This shows the integrated value of voltage fluctuation between In Figures 2 and (B), the integrated voltage value due to vibration and fluff is V,
, V, then VA=S':f, (t) dt...
・・２・・−・−・−・−・・・・−・・・・・・・−
・・■■3=)t, f, (t)dt−・−・・・・−
・・・・・・－・・・・・・－・・・・・・・・・・・・・・・
・・・・・・－・・・・・・・・・■〈v, is the second
It is clear from the figure. Figure 3 is a rough version of the voltage integration value, and minute fuzz can be detected by setting the detection sensitivity level between V and tV.

Although it varies depending on the warping speed, vibration amplitude, period, etc., in order to detect finer fuzz, it is necessary to increase the amplification gain (amplification gain), lengthen the detection timing T, and set the detection sensitivity level as high as possible. Increasing T is not a desirable method because it takes a long time from detecting fluff to stopping, and it is preferable to adjust the gain and level.

FIG. 4 shows a functional diagram of the present invention, in which the fluff, vibrations, etc. detected by the detector 5 (1) consisting of a photoelectric filter are amplified to an appropriate amount by the signal amplifier (2), and the detection timing setter (3) The integration circuit (4) integrates the voltage signal for the time T microseconds set by the comparator circuit (5).
) When a signal exceeds a set level compared to the detection sensitivity level of 1.), a stop signal command device (6)K is sent to the warping machine or the like to stop the machine and remove the fuzz.

A specific example will be explained below.

Specific Example 1 As a result of warping nylon tack using a type 1 warper manufactured by Tsudakoma Kogyo Co., Ltd., there are two types of nylon tack that have been removed using the fuzz detection method of the present invention and a conventional fuzz detector (fuzz detection manufactured by Haruta Denki Co., Ltd.). As a result of comparison with the one using a warping machine T6-A type), it was found that according to the present invention, the frequency of fuzz generation during warping increases;
Improvements in weavability and gray fabric quality were observed. The setting conditions for the fluff detection method of the present invention are as follows.

Gain... Set the maximum value of the fluff voltage signal to 12V Timing... 15 x 10-5 seconds Level... 0.4
We will discuss the 5m x 0.9m fluff detection level, textile standards, and fiber manufacturing conditions.

Textile specifications Yarn used Warp nylon 70d/16f Weft nylon 70/24f Jet loom LW52-150 type Rotation speed 515r, p, m Evaluation of warving and fiber-making properties under the above conditions will be described.

Fuzz detection method Conventional method Invention method Warping speed Cm 1 min') 300 300 Warping fuzz (a/10'm) 0.03 0.09
Weaving operation rate% 95.6 97.8
Gray fabric passing rate (to) 97.5 98
．． 9 Specific Example 2 A beam warped under the same conditions as in Specific Example 1 was fiber-milled at high speed, and as a result, more significant differences were observed as shown below.

Fuzz detection method Conventional method Inventive loom rotation speed 710 710 production efficiency
85.5 95.4 Gray cloth pass rate 90
．． 197.8 However, the loom used was a water jet loom model ZW200 manufactured by Tsudakoma Kogyo Co., Ltd.

The fluff detection method of the present invention can be carried out as described above, and can accurately detect minute fluff that could not be removed conventionally during warping or fiber production of woven or knitted fabrics, and as a result, minute fluff can be easily detected. It can be removed.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention, and FIG. 1 shows voltage signal fluctuation curves due to fluff and vibrations measured by an oscilloscope, and FIG. A model diagram of the curve, FIG. 3 is a graph showing the shaded area shown in FIG. 2, and FIG. 4 is a block circuit diagram of the present invention. (1)...detection section, (2)... signal amplifier, (3)
...detection timing setter, (4)...integrator circuit,
(5) Comparison circuit, (6) Stop signal command device agent Yoshihiro Morimoto Figure 1 Figure 2

Claims (1)

[Claims] 1. When warping woven fabrics and knitted products, the signal detected by the photoelectric detection method of the raw yarn fuzz is converted into a voltage signal, amplified and integrated, and compared and sorted with signals caused by yarn vibration etc. to detect noise signals such as vibration signals. A fluff detection method characterized by detecting fluff by removing.