JPS63127987U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は実施例に係わる糸条加工機の説明図、
第２図は実施例のブロツク図、第３図はその各部
の信号波形の説明図、第４図は実施例の糸条太さ
と検出信号の関係を示すグラフである。 １００：光電検出装置、１０１：発光回路、１
０２：受光回路、１０５：出力演算回路、１０６
：遅延回路、１０８：比較調整回路。 FIG. 1 is an explanatory diagram of a yarn processing machine according to an embodiment;
FIG. 2 is a block diagram of the embodiment, FIG. 3 is an explanatory diagram of signal waveforms of each part thereof, and FIG. 4 is a graph showing the relationship between yarn thickness and detection signal of the embodiment. 100: Photoelectric detection device, 101: Light emitting circuit, 1
02: Light receiving circuit, 105: Output calculation circuit, 106
: Delay circuit, 108: Comparison adjustment circuit.

Claims (1)

【実用新案登録請求の範囲】 １ 光ビームを発する発光部と、物体によつて遮
断若しくは反射された該光ビームを受光し、物体
による光ビームの光量変化に比例した直流検出信
号を出力する光電変換部とを備えた光電検出装置
において、光電変換部にその直流検出信号を所定
の時定数で設定値に調整する自動利得調整回路を
設けると共に、該直流検出信号に対して前記自動
利得調整回路の時定数より小さい遅れ時間だけ遅
延して追従する基準信号を発生する遅延回路と、
該基準信号と前記検出信号の差を演算して出力す
る出力演算回路とを設け、光量の急激な変化をパ
ルス状信号として出力するようになしたことを特
徴とする光電検出装置。 ２ 前記遅延回路が所定時定数の積分回路であり
、前記出力演算回路が差動増巾回路である実用新
案登録請求の範囲第１項記載の光電検出装置。 ３ 前記遅延回路が出力演算回路に対してフイー
ドバツクループを構成する実用新案登録請求の範
囲第１項若しくは第２項記載の光電検出装置。 ４ 光ビームが物体により間欠的に遮断若しくは
反射され、光電変換部は遮断若しくは反射された
光ビームを電気信号に変換する受光素子と、受光
素子の出力を増巾する交流増巾器と、交流増巾器
のパルス出力をアナログ信号に変換する変換回路
と、該アナログ信号が設定値になるように所定の
時定数で前記交流増巾器の利得を調整する自動利
得調整回路とからなる実用新案登録請求の範囲第
１項〜第３項記載のいずれかの光電検出装置。 ５ 物体が複数の糸条が合糸された合糸糸条であ
る実用新案登録請求の範囲第１項〜第４項記載の
いずれかの光電検出装置。[Claims for Utility Model Registration] 1. A light emitting unit that emits a light beam, and a photoelectric device that receives the light beam blocked or reflected by an object and outputs a DC detection signal proportional to the change in the amount of light of the light beam caused by the object. In a photoelectric detection device comprising a conversion section, the photoelectric conversion section is provided with an automatic gain adjustment circuit that adjusts the DC detection signal to a set value with a predetermined time constant, and the automatic gain adjustment circuit is provided with respect to the DC detection signal. a delay circuit that generates a reference signal to be followed by delaying by a delay time smaller than a time constant;
A photoelectric detection device comprising: an output calculation circuit that calculates and outputs the difference between the reference signal and the detection signal, and outputs a sudden change in light amount as a pulsed signal. 2. The photoelectric detection device according to claim 1, wherein the delay circuit is an integration circuit with a predetermined time constant, and the output calculation circuit is a differential amplification circuit. 3. The photoelectric detection device according to claim 1 or 2, wherein the delay circuit constitutes a feedback loop for the output calculation circuit. 4. A light beam is intermittently blocked or reflected by an object, and the photoelectric conversion unit includes a light receiving element that converts the blocked or reflected light beam into an electrical signal, an AC amplifier that amplifies the output of the light receiving element, and an AC amplifier that amplifies the output of the light receiving element. A utility model comprising a conversion circuit that converts the pulse output of an amplifier into an analog signal, and an automatic gain adjustment circuit that adjusts the gain of the AC amplifier with a predetermined time constant so that the analog signal becomes a set value. A photoelectric detection device according to any one of registered claims 1 to 3. 5. The photoelectric detection device according to any one of claims 1 to 4 of the utility model registration claim, wherein the object is a spliced yarn in which a plurality of yarns are spliced.