JPH0723881B2 - Weight fluctuation detector for test materials - Google Patents
Weight fluctuation detector for test materialsInfo
- Publication number
- JPH0723881B2 JPH0723881B2 JP60192496A JP19249685A JPH0723881B2 JP H0723881 B2 JPH0723881 B2 JP H0723881B2 JP 60192496 A JP60192496 A JP 60192496A JP 19249685 A JP19249685 A JP 19249685A JP H0723881 B2 JPH0723881 B2 JP H0723881B2
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- frequency
- voltage
- yarn
- tuning circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000012360 testing method Methods 0.000 title claims description 16
- 239000000463 material Substances 0.000 title claims description 15
- 206010049040 Weight fluctuation Diseases 0.000 title claims description 7
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000003570 air Substances 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Landscapes
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Description
【発明の詳細な説明】 本発明は、試験資料の重量変動を評価する主として紡織
工場に於ける糸むら試験器、電子的ヤーンクリアラ等に
使用される試験資料の重量変動検出装置に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weight variation detecting device for evaluating the weight variation of a test material, which is mainly used in a yarn unevenness tester, an electronic yarn clearer or the like in a textile factory. .
一般に、紡織工場に於いては糸中に含まれる糸むら変動
乃至二重糸、太糸、細糸等の糸欠陥を監視乃至除去する
ために、糸むら試験器、電子的ヤーンクリアラ等の糸欠
陥検出装置が設備されているが、この装置は一対の金属
平面板から成る測定コンデンサー内に挿入された糸が同
コンデンサー内を走行するとき、糸の重量変動による誘
電率の変化によって測定コンデンサーの電気容量が変化
することを電子的に検出し、この容量変化でもって間接
的に糸の重量変動を評価するようにしたものである。Generally, in a weaving factory, in order to monitor or remove fluctuations in yarn unevenness contained in yarns or yarn defects such as double yarns, thick yarns and thin yarns, yarns such as yarn unevenness tester and electronic yarn clearer are used. Although a defect detection device is installed, this device uses a measuring capacitor consisting of a pair of flat metal plates, and when a thread inserted in the measuring capacitor runs inside the capacitor, the change in the dielectric constant due to the weight change of the thread causes the measuring capacitor to change. The change in the electric capacity is electronically detected, and the weight change of the yarn is indirectly evaluated by the change in the capacity.
然しながら、測定コンデンサー内への糸挿入による容量
増加は1/1000PF程度であり、糸欠陥を検出するためには
非常に高感度かつ高安定の検出装置が要求される。However, the capacity increase due to the insertion of the yarn into the measuring condenser is about 1/1000 PF, and a very sensitive and highly stable detection device is required to detect the yarn defect.
而して、現在実用化されているこの種の検出装置とし
て、測定コンデンサーをLC発振器のＣ要素として用い、
この容量変化による周波数変動を評価するようにしたも
の、或いは、上記容量変化によるＱ特性の変化を利用す
るようにしたものがあるが、前者にあっては周波数変動
の復調手段たる電気回路が高価であり、後者にあっては
調整時Ｑ特性の微分特性を求める必要があり、調整法が
煩雑であると共に、検出に利用できるリニヤー範囲が狭
いという欠点を有していた。Thus, as a detection device of this type that is currently in practical use, the measurement capacitor is used as the C element of the LC oscillator,
There are those which evaluate the frequency fluctuation due to this capacitance change, and those which utilize the change of the Q characteristic due to the above capacitance change. In the former case, the electric circuit as the frequency fluctuation demodulation means is expensive. In the latter case, however, the differential characteristic of the Q characteristic at the time of adjustment needs to be obtained, and the adjustment method is complicated, and the linear range available for detection is narrow.
然るに、本発明は、上記既存の検出装置の欠点を除去解
決するために、測定コンデンサーをＣ要素として含むLC
並列回路に別のコンデンサーを直列接続して同調回路を
構成し、この同調回路に高周波電圧を抵抗を介して印加
し、同調回路への入力電圧とコンデンサーからの出力電
圧それぞれのピーク検波出力電圧の差を求めたときに得
られるＳ字特性を利用した、調整法が極めて簡単で、特
に高価な電気回路を必要としない検出装置を提供するも
のである。Therefore, the present invention, in order to eliminate the drawbacks of the existing detection device described above, solves the problem of LC including a measurement capacitor as a C element.
Another capacitor is connected in series to the parallel circuit to form a tuning circuit, and a high-frequency voltage is applied to this tuning circuit via a resistor. The input voltage to the tuning circuit and the output voltage from the capacitor It is an object of the present invention to provide a detection device utilizing an S-shaped characteristic obtained when a difference is obtained, which has an extremely simple adjustment method and does not require an expensive electric circuit.
以下、図示する実施例について本発明の具体的構成を説
明する。Specific configurations of the present invention will be described below with reference to the illustrated embodiments.
即ち、本発明に係る試験資料の重量変動検出装置は、糸
等の試験資料を挿入する一対の金属平面板から成る測定
コンデンサー１にインダクタンス２を並列接続して形成
したLC回路にコンデンサー３を直列接続して同調回路Ａ
を構成し、該同調回路Ａに抵抗５を介して高周波電圧を
印加する周波数固定の高周波発振器４を設けると共に、
同調回路Ａへの入力電圧と、コンデンサー３からの出力
電圧をそれぞれピーク検波するピーク検波器６、７並び
に両ピーク検波器からの検波出力電圧の差をとる差動増
幅器８を設けたことを特徴とするものである。That is, in the weight fluctuation detecting apparatus for a test material according to the present invention, the capacitor 3 is connected in series to the LC circuit formed by connecting the inductance 2 in parallel to the measuring capacitor 1 formed of a pair of flat metal plates into which the test material such as a thread is inserted. Connect and tune circuit A
And a fixed frequency high frequency oscillator 4 for applying a high frequency voltage to the tuning circuit A via a resistor 5,
It is characterized in that peak detectors 6 and 7 for respectively peak-detecting the input voltage to the tuning circuit A and the output voltage from the capacitor 3 and a differential amplifier 8 for detecting the difference between the detection output voltages from both peak detectors are provided. It is what
而して、本発明の上記構成に従い、図示する実施例につ
いて本発明装置の作用、効果を説明する。The operation and effect of the device of the present invention will be described below with reference to the illustrated embodiment according to the above-described structure of the present invention.
即ち、測定コンデンサー１内に試験資料を挿入していな
い状態に於いて高周波発振器４から同調回路Ａに高周波
電圧を印加し、その周波数f0を変化させると、同調回路
Ａへの入力電圧をピーク検波するピーク検波器６から出
力される電圧VAとコンデンサー３からの出力電圧をピー
ク検波するピーク検波器７から出力される電圧VBはそれ
ぞれ入力周波数f0に対して第２図に示されるような曲線
を描くから、これら電圧VA、VBの差をとる差動増幅器８
から出力される電圧V0は、入力周波数f0に対して第３図
実線に示されるようなＳ字曲線を描くことになる。これ
をＳ字特性という。That is, when a high-frequency voltage is applied from the high-frequency oscillator 4 to the tuning circuit A in a state where the test material is not inserted in the measuring capacitor 1 and the frequency f 0 is changed, the input voltage to the tuning circuit A peaks. The voltage V A output from the peak detector 6 for detection and the voltage V B output from the peak detector 7 for peak detection of the output voltage from the capacitor 3 are respectively shown in FIG. 2 for the input frequency f 0 . Since such a curve is drawn, a differential amplifier 8 that takes the difference between these voltages V A and V B
The voltage V 0 output from the device draws an S-shaped curve as shown by the solid line in FIG. 3 with respect to the input frequency f 0 . This is called an S-shaped characteristic.
このＳ字曲線は、測定コンデンサー１内に空気よりも誘
電率の高い試験資料が挿入され、測定コンデンサー１の
容量が微小変化しても第３図点線の如く前よりも低い周
波数域に平行移動するだけで形状が変わることがないの
で、試験資料を挿入しない状態のとき、出力電圧V0が零
となるように入力周波数f0を調節しておけば、試験資料
例えば糸挿入と同時にΔV0の電圧が出力され、この挿入
時の糸の太さを平均太さとすれば、糸が測定コンデンサ
ー１内を走行している間に糸むら、二重糸、細糸等の重
量変動があると出力電圧V0が変化するので、この出力電
圧V0を監視することによって糸むらの大、小を評価する
とか、二重糸、細糸等の糸欠陥があるとかを検出するこ
とができるものである。This S-shaped curve moves in parallel to the lower frequency range as shown by the dotted line in Fig. 3 even if the capacitance of the measuring capacitor 1 is slightly changed by inserting the test material with a higher dielectric constant than air into the measuring capacitor 1. Since the shape does not change when the test material is not inserted, if the input frequency f 0 is adjusted so that the output voltage V 0 becomes zero when the test material is not inserted, the test material, for example, ΔV 0 Is output, and if the thickness of the thread at the time of this insertion is taken as the average thickness, there is a fluctuation in the weight of thread unevenness, double thread, fine thread, etc. while the thread is running in the measuring condenser 1. Since the output voltage V 0 changes, it is possible to evaluate whether the yarn unevenness is large or small by monitoring the output voltage V 0 or to detect whether there is a yarn defect such as double yarn or thin yarn. Is.
つまり、本発明に係る試験資料の重量変動検出装置によ
れば、試験資料の重量変動を電気容量の変化に置換する
測定コンデンサーをＣ要素とするLC並列回路にコンデン
サーを直列接続して同調回路を構成し、この同調回路に
周波数固定の高周波電圧を抵抗を介して印加し、同調回
路への入力電圧とコンデンサーからの出力電圧それぞれ
のピーク検波出力電圧の差を求めたときに得られるＳ字
特性を利用して試験資料の重量変動を検出するようにし
たものであるから、従来公知の周波数変動を直接評価す
る検出装置のように周波数変動を復調するための高価な
電気回路を必要とせず、また、Ｑ特性の変化を利用する
検出装置のように調整法が複雑であるというようなこと
がなく、検出に利用できるリニヤー範囲が広いため、最
初に入力周波数を調節しておけば、環境空気、環境温度
の変化によって測定コンデンサーの固有容量が変化して
も出力電圧からその変化分だけ削除することによって正
確な検出値が得られるという利点を有し、周波数固定の
高周波発振器を使用することができ、調節不要の検出装
置を提供することができる等極めて多大な効果を奏し得
るものである。In other words, according to the weight fluctuation detecting apparatus for the test material according to the present invention, the capacitor is connected in series to the LC parallel circuit having the C element as the measuring capacitor for replacing the weight fluctuation of the test material with the change in the electric capacity to form the tuning circuit. S-shaped characteristics obtained when a high frequency voltage with a fixed frequency is applied to this tuning circuit through a resistor and the difference between the peak detection output voltage of the input voltage to the tuning circuit and the output voltage from the capacitor is obtained. Since it is intended to detect the weight fluctuation of the test material by utilizing, does not require an expensive electric circuit for demodulating the frequency fluctuation like the conventionally known detection device for directly evaluating the frequency fluctuation, In addition, the adjustment method is not complicated unlike the detection device that uses the change in the Q characteristic, and the linear range that can be used for detection is wide. In short, even if the characteristic capacitance of the measuring capacitor changes due to changes in the ambient air and ambient temperature, it has the advantage that an accurate detection value can be obtained by deleting that amount from the output voltage, and the frequency is fixed. The high-frequency oscillator can be used, and it is possible to provide a detection device that does not require adjustment.
尚、本発明装置として、本実施例では糸むら試験器、電
子的ヤーンクリアラ等糸欠陥検出装置を挙示したが、糸
になる前段階のスライバー、ロービング等の試験器或い
はフィルム状シートの厚さ試験器等の試験資料の重量変
動を測定コンデンサーの容量変化によって検出するよう
にした測定器全般に使用することができること勿論であ
る。As the device of the present invention, a yarn unevenness tester and a yarn defect detecting device such as an electronic yarn clearer are shown in the present embodiment. However, a sliver before the yarn is formed, a roving tester or a film-like sheet thickness Needless to say, the present invention can be used for all measuring instruments in which the weight fluctuation of the test material such as the testing instrument is detected by the capacitance change of the measuring capacitor.
図面は、本発明の実施態様を例示するもので、 第１図は、本発明装置の電気回路図、 第２図は、本発明装置に於けるピーク検波出力電圧を入
力周波数に対してプロットしたグラフ、 第３図は、第２図のピーク検波出力電圧の差を入力周波
数に対してプロットしたグラフである。 １……測定コンデンサー、２……インダクタンス、３…
…コンデンサー、４……高周波発振器、５……抵抗、
６、７……ピーク検波器、８……差動増幅器The drawings exemplify embodiments of the present invention. FIG. 1 is an electric circuit diagram of the present invention device, and FIG. 2 is a plot of peak detection output voltage in the present invention device against input frequency. A graph and FIG. 3 are graphs in which the difference between the peak detection output voltages of FIG. 2 is plotted against the input frequency. 1 ... Measuring capacitor, 2 ... Inductance, 3 ...
… Capacitor, 4 …… High frequency oscillator, 5 …… Resistor,
6, 7 ... Peak detector, 8 ... Differential amplifier
Claims (1)
成る測定コンデンサー１にインダクタンス２を並列接続
して形成したLC回路にコンデンサー３を直列接続して同
調回路Ａを構成し、該同調回路Ａに抵抗５を介して高周
波電圧を印加する周波数固定の高周波発振器４を設ける
と共に、同調回路Ａへの入力電圧と、コンデンサー３か
らの出力電圧をそれぞれピーク検波するピーク検波器
６、７並びに両ピーク検波器からの検波出力電圧の差を
とる差動増幅器８を設けたことを特徴とする試験資料の
重量変動検出装置。1. A tuning circuit A is constructed by connecting a capacitor 3 in series to an LC circuit formed by connecting an inductance 2 in parallel to a measurement capacitor 1 composed of a pair of flat metal plates into which test materials are inserted. A fixed frequency radio-frequency oscillator 4 for applying a radio-frequency voltage via a resistor 5 is provided to A, and peak detectors 6 and 7 for detecting the input voltage to the tuning circuit A and the output voltage from the capacitor 3 and both are provided. A weight fluctuation detecting device for test material, comprising a differential amplifier 8 for detecting a difference between detection output voltages from a peak detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60192496A JPH0723881B2 (en) | 1985-08-30 | 1985-08-30 | Weight fluctuation detector for test materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60192496A JPH0723881B2 (en) | 1985-08-30 | 1985-08-30 | Weight fluctuation detector for test materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6252447A JPS6252447A (en) | 1987-03-07 |
| JPH0723881B2 true JPH0723881B2 (en) | 1995-03-15 |
Family
ID=16292270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60192496A Expired - Fee Related JPH0723881B2 (en) | 1985-08-30 | 1985-08-30 | Weight fluctuation detector for test materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0723881B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3879660A (en) * | 1973-10-24 | 1975-04-22 | John S Piso | Capacitive measuring system |
| JPS60135753A (en) * | 1983-12-23 | 1985-07-19 | Koa Sangyo Kk | Noncontacting moisture detector |
-
1985
- 1985-08-30 JP JP60192496A patent/JPH0723881B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6252447A (en) | 1987-03-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |