JPH07258942A - Weft-detection apparatus of water-jet loom - Google Patents
Weft-detection apparatus of water-jet loomInfo
- Publication number
- JPH07258942A JPH07258942A JP6073940A JP7394094A JPH07258942A JP H07258942 A JPH07258942 A JP H07258942A JP 6073940 A JP6073940 A JP 6073940A JP 7394094 A JP7394094 A JP 7394094A JP H07258942 A JPH07258942 A JP H07258942A
- Authority
- JP
- Japan
- Prior art keywords
- weft
- signal
- photoelectric sensor
- detection
- change rate
- 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.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
- D03D47/32—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by liquid jet
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
- D03D51/18—Automatic stop motions
- D03D51/34—Weft stop motions
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
- D03J1/00—Auxiliary apparatus combined with or associated with looms
- D03J1/04—Auxiliary apparatus combined with or associated with looms for treating weft
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
- D03J2700/00—Auxiliary apparatus associated with looms; Weavening combined with other operations; Shuttles
- D03J2700/06—Auxiliary devices for inspecting, counting or measuring
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】この発明は、水噴射式織機におい
て、緯入れされた緯糸を光学的検知手段により検知する
緯糸検知装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft detecting device for detecting a weft inserted in a water jet loom by an optical detecting means.
【0002】[0002]
【従来の技術】従来、水噴射式織機の光学的緯糸検知装
置は、例えば特公昭57−13653号公報に開示され
ているように、緯入れされた緯糸が筬打ちされる際に通
過する移動軌跡をはさんで、投光器と受光器を対向して
配置し、この投光器と受光器との間隔を狭くし、その間
隙部に水が表面張力により常時保持されるようにしたも
のがある。これは、緯入れ時のウォータジェットにより
水滴が飛散し、投受光器間を、この飛散した水が横切る
ようなことがあると、ノイズとして検出され、また、緯
糸の通過時においても濡れた緯糸が通過して水滴が投受
光器に付着してノイズとなったりすることを防止するた
めのものである。そして、常時水が投受光器間に存在
し、飛散した水滴による影響が無く、検知精度が向上す
るというものである。2. Description of the Related Art Conventionally, an optical weft detecting device for a water jet loom is moved by a weft yarn when a weft yarn inserted therein is beaten as disclosed in Japanese Patent Publication No. 57-13653. There is a device in which a light emitter and a light receiver are arranged so as to face each other across a locus, and a distance between the light emitter and the light receiver is narrowed so that water is constantly held in the space by surface tension. This is because if water droplets are scattered by the water jet during weft insertion, and the scattered water may cross between the light emitter and the light receiver, it will be detected as noise. This is for preventing water droplets from passing through and adhering to the light emitter / receiver to cause noise. Then, water is always present between the light emitter and the light receiver, and there is no influence of the water droplets scattered, and the detection accuracy is improved.
【0003】しかしながら、上記技術の場合、筬打ちや
モータの回転等の製織運動にともなう振動が投受光器に
伝わると、投受光器間に保持された水が揺らぎ、この水
の揺らぎにより受光器の受光量が減少しノイズとなる波
形が検知され、緯糸の通過による信号と区別できない場
合には、このノイズを緯糸として誤検知してしまうこと
がある。However, in the case of the above-mentioned technique, when vibrations caused by weaving motion such as beating and rotation of a motor are transmitted to the light emitter / receiver, the water held between the light emitter / receiver fluctuates, and this light fluctuation causes the light receiver. When a waveform that causes noise due to a decrease in the amount of received light is detected and cannot be distinguished from the signal due to the passage of the weft, this noise may be erroneously detected as a weft.
【0004】そこで、本願出願人による特願平4−30
3112号に記載したように、受光器から得られた信号
を微分処理し、受光器から得られた信号の変化率を検出
する信号変化率検出手段と、この信号変化率検出手段に
より得られた信号を所定の基準値と比較する比較手段と
を設け、この比較手段の出力により上記信号変化率検出
手段からの信号が所定の基準値より大きい場合に緯糸と
判断し小さい場合は緯入れミスであると判断するように
した水噴射式織機の緯糸検知装置が提案されている。Therefore, Japanese Patent Application No. 4-30 filed by the applicant of the present application
No. 3112, a signal change rate detecting means for differentiating a signal obtained from a light receiver to detect a change rate of the signal obtained from the light receiver, and a signal change rate detecting means. A comparison means for comparing the signal with a predetermined reference value is provided, and if the signal from the signal change rate detection means is larger than the predetermined reference value by the output of the comparison means, it is judged as a weft and if it is smaller, a weft insertion error occurs. There has been proposed a weft detection device for a water jet loom that is determined to exist.
【0005】[0005]
【発明が解決しようとする課題】上記微分処理を行う緯
糸検知装置は、投受光器間に緯糸が侵入する時の出力信
号波形の変化率を検知し、この変化率を所定の基準値と
比較して緯糸か否かを判断しているものであるため、依
然として正確に糸の侵入であるか水滴等による信号であ
るか判別できない場合があった。即ち、投受光器を保持
した検知装置に、大きな振動が急激に加わると、投受光
器間の水が急激に揺らぎ、この水の揺らぎによる透過率
の急激な変化が受光器の出力信号の急変となって現れ、
緯糸の侵入時と同様に急峻な信号変化となる場合があっ
た。また、投受光器間に外部から水が飛び込んできた場
合も、投受光器間の水が急激に揺らぎ、緯糸の侵入時と
同様に、急峻な出力信号変化となる場合があった。さら
に、投受光器間に水が存在しない場合に、その投受光器
間に外部から水が飛び込むと、この時も、上記と同様
に、受光器の出力信号は急激な変化をする。SUMMARY OF THE INVENTION The weft yarn detecting device for performing the differential processing detects the rate of change of the output signal waveform when the weft yarn enters between the light emitter and the light receiver, and compares this rate of change with a predetermined reference value. Since it is determined whether or not it is a weft yarn, it may still not be possible to accurately determine whether it is a yarn intrusion or a signal due to a water drop or the like. That is, when a large vibration is suddenly applied to the detector holding the light emitter / receiver, the water between the light emitter / receiver suddenly fluctuates, and a sharp change in the transmittance due to this water fluctuation causes a sudden change in the output signal of the light receiver. Appears,
As in the case of weft thread intrusion, there was a case where the signal changed abruptly. In addition, when water jumps in from the outside between the light emitter and the light receiver, the water between the light emitter and the light receiver may fluctuate abruptly, and the output signal may change abruptly as in the case where the weft enters. Further, when water does not exist between the light-emitter and light-receiver, and if water jumps from the outside between the light-emitter and light-receiver, the output signal of the light-receiver also makes a sharp change at this time as in the above case.
【0006】この発明は上記従来の技術の問題点に鑑み
て成されたもので、水の揺らぎ等によるノイズ信号に影
響されることなく、正確な緯糸検知を行うことができる
水噴射式織機の緯糸検知装置を提供することを目的とす
る。The present invention has been made in view of the above-mentioned problems of the prior art, and provides a water jet loom that can perform accurate weft detection without being affected by a noise signal due to fluctuation of water. It is an object to provide a weft detection device.
【0007】[0007]
【課題を解決するための手段】この発明は、筬打ちされ
る緯糸が通過する軌跡と対面して設けられたフォトダイ
オード等の光電センサと、上記光電センサから得られた
信号の変化率を検出する微分回路等の信号変化率検出手
段と、この信号変化率検出手段により得られた信号のう
ち上記光電センサの検知部から上記緯糸が抜け出る際に
上記信号変化率検出手段により得られる信号の値、例え
ばその絶対値を所定の基準値と比較して、基準値以上で
あれば正常に緯入れが成されたとする緯入れ成否の判定
信号を出力する比較手段とを設けた水噴射式織機の緯糸
検知装置である。SUMMARY OF THE INVENTION The present invention detects a photoelectric sensor such as a photodiode provided so as to face a trajectory through which a weft to be beaten passes, and a rate of change of a signal obtained from the photoelectric sensor. A signal change rate detecting means such as a differentiating circuit, and a value of the signal obtained by the signal change rate detecting means when the weft exits from the detecting portion of the photoelectric sensor among the signals obtained by the signal change rate detecting means. , For example, comparing the absolute value with a predetermined reference value, and if it is equal to or larger than the reference value, a comparison means for outputting a judgment signal of success or failure of weft insertion is normally provided It is a weft detection device.
【0008】またこの発明は、上記信号変化率検出手段
からの信号のうち上記検知部から上記緯糸が抜け出る際
に得られる信号を積分する積分回路等の積分手段と、こ
の積分回路により得られた信号の値、例えば絶対値を、
所定の基準値と比較して緯入れ成否の判定信号を出力す
る比較手段とを設けた水噴射式織機の緯糸検知装置であ
る。さらに、上記信号変化率検出手段と上記積分器との
間には、上記検知部から上記緯糸が抜け出る際に得られ
る信号と同じ符号の信号を通過させ逆の信号を除去する
ダイオード等の信号選別手段が設けられているものであ
る。The present invention is also obtained by integrating means, such as an integrating circuit, which integrates a signal obtained when the weft yarn comes out of the detecting portion among the signals from the signal change rate detecting means, and the integrating circuit. The value of the signal
A weft detection device for a water-jet loom, which is provided with a comparison unit that outputs a determination signal indicating whether or not weft insertion has been successful in comparison with a predetermined reference value. Further, between the signal change rate detecting means and the integrator, a signal selection such as a diode for passing a signal having the same sign as the signal obtained when the weft yarn comes out of the detecting section and removing an opposite signal. Means are provided.
【0009】また、この発明の光電センサは発光素子と
受光素子とからなり、検知部は各光ファイバの一端面が
緯糸通過軌跡に対面して形成され、各光ファイバの他端
部には各々発光素子と受光素子が配置されているもので
ある。Further, the photoelectric sensor of the present invention comprises a light emitting element and a light receiving element, and the detecting portion is formed such that one end face of each optical fiber faces the weft passing locus, and the other end portion of each optical fiber is formed. A light emitting element and a light receiving element are arranged.
【0010】[0010]
【作用】この発明の水噴射式織機の緯糸検知装置は、緯
糸が光電センサの検知部から抜け出る際に得られる信号
の変化率の大きさにより緯入れを検知するようにしたの
で、投受光器間の水の揺らぎや水滴の飛び込み等による
信号は無視され、緯糸が光電センサの検知部から抜け出
る際の急峻な出力変化による信号のみが緯糸として確実
に判断されるようにしたものである。In the weft detecting device of the water jet loom of the present invention, the weft insertion is detected by the magnitude of the rate of change of the signal obtained when the weft exits from the detecting portion of the photoelectric sensor. Signals due to fluctuations in water or jumps of water droplets are ignored, and only signals due to abrupt output changes when the weft thread exits the detection section of the photoelectric sensor are reliably determined as the weft thread.
【0011】即ち、緯糸が検知部に入り込む際及び検知
部から抜け出る際の光電センサの出力信号は、ともに大
きな変化が生じ信号変化率の絶対値はともに大きい。こ
れに対して、水滴の飛び込みにより得られる信号は、水
滴が検知部に飛び込む際には、急激に検知部に水が付い
て出力信号に大きな変化が生じることがあるが、検知部
から水が出て行く際には、急激に水が完全に出ていくこ
とはあり得ず、水の表面張力により必ず一部の水は検知
部に付着したまま残る。従って、水滴が検知部から出て
行く際の光電センサの出力信号は相対的に大きな変化は
しない。また、検知部の水の揺らぎによる信号について
は、緯糸の通過時の出力信号ほど急激な変化はなく、確
実に区別可能である。従って、緯糸が検知部から出てい
く際の出力信号の値を基に、緯糸の検知を行うことによ
り、水の揺れや水の出入りによるノイズを完全に克服す
ることができるものである。That is, the output signals of the photoelectric sensor when the weft enters the detection unit and when the weft exits the detection unit undergo large changes, and the absolute values of the signal change rates are both large. On the other hand, the signal obtained by jumping in a water drop may cause a large change in the output signal when the water drop suddenly attaches to the detection part. When it goes out, the water cannot suddenly come out completely, and due to the surface tension of the water, some water always remains attached to the detection part. Therefore, the output signal of the photoelectric sensor does not change significantly when the water droplet exits the detection unit. In addition, the signal due to the fluctuation of the water of the detection unit does not change as rapidly as the output signal when the weft passes, and can be reliably distinguished. Therefore, by detecting the weft yarn based on the value of the output signal when the weft yarn exits from the detection unit, it is possible to completely overcome the noise due to the shaking of water and the ingress and egress of water.
【0012】また、緯糸の緩み等により検知部での緯糸
の移動速度が遅くなり、信号変化率検出手段の出力レベ
ルが低くても、緯糸が抜け出るまでの期間が長くなるの
で、信号変化率検出手段で得られた信号をさらに積分す
ることにより、信号変化率検出手段の出力の大小にかか
わらず、緯糸が抜け出る際の信号は一定値以上の比較的
大きな値が得られるものである。Further, the looseness of the weft and the like slows down the moving speed of the weft in the detecting section, and even if the output level of the signal change rate detecting means is low, the period until the weft comes out becomes long, so that the signal change rate is detected. By further integrating the signal obtained by the means, the signal when the weft comes out can obtain a relatively large value of a certain value or more regardless of the magnitude of the output of the signal change rate detecting means.
【0013】[0013]
【実施例】以下この発明の実施例について図面に基づい
て説明する。図1〜図4はこの発明の水噴射式織機の緯
糸検知装置の第一実施例を示すもので、この実施例の緯
糸検知装置11は、図3,図4に示すように、水噴射式
織機の反緯入れ側端部に配設され、図示しない綜絖によ
り開口された経糸10が挿通された筬12の一端部と対
面して設けられている。筬12の一端部には、筬打ちの
際に緯糸検知装置11との干渉を避けるための開口部1
2aが形成されている。経糸10の開口部には、緯入れ
用ノズル14から噴射されるウォータジェットにより緯
入れされる緯糸16が、所定の緯入れタイミングで挿通
される。Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of a weft detection device for a water jet loom according to the present invention. A weft detection device 11 of this embodiment has a water jet type as shown in FIGS. The warp thread 10 is provided at the end of the weaving machine on the side opposite to the weft insertion side and faces the one end of the reed 12 into which the warp thread 10 opened by a heddle (not shown) is inserted. At one end of the reed 12, an opening 1 is provided for avoiding interference with the weft detection device 11 during beating.
2a is formed. A weft yarn 16 inserted by a water jet ejected from a weft insertion nozzle 14 is inserted into the opening portion of the warp yarn 10 at a predetermined weft insertion timing.
【0014】この実施例の緯糸検知装置11は、緯入れ
された緯糸16が通過可能な幅の狭いスリット18が形
成された保持部材20と、このスリット18をはさん
で、スリット18の両側の保持部材20内に設けられ、
スリット18の所定位置で互いに一端面が対向した光透
過部材である光ファイバ22、24を有している。光フ
ァイバ22の他端部には、図1に示すように、発光ダイ
オード等の発光素子23が設けられ、光ファイバ24の
他端部には、フォトダイオードやフォトトランジスタ等
の受光素子25が設けられている。これら一対の発光素
子23及び受光素子25は、この発明の光電センサを形
成している。スリット18の光ファイバ22と光ファイ
バ24の端部が対面して位置した部分である検知部21
には、通常水がその表面張力により保持されている。そ
して、スリット18が筬打ちされた緯糸16の移動軌跡
中に位置するように、図示しない織機フレームに取り付
けられた取付部材28に、この保持部材20が固定され
ている。The weft detecting device 11 of this embodiment has a holding member 20 formed with a narrow slit 18 through which the weft yarn 16 inserted can pass, and a holding member 20 sandwiching this slit 18 on both sides of the slit 18. Provided in the holding member 20,
It has optical fibers 22 and 24, which are light transmitting members, one end surfaces of which face each other at a predetermined position of the slit 18. As shown in FIG. 1, a light emitting element 23 such as a light emitting diode is provided at the other end of the optical fiber 22, and a light receiving element 25 such as a photodiode or a phototransistor is provided at the other end of the optical fiber 24. Has been. The pair of light emitting element 23 and light receiving element 25 form the photoelectric sensor of the present invention. The detection unit 21 which is a portion where the ends of the optical fiber 22 and the optical fiber 24 of the slit 18 are located facing each other
In general, water is retained by its surface tension. The holding member 20 is fixed to a mounting member 28 mounted on a loom frame (not shown) so that the slit 18 is positioned in the movement trajectory of the beating yarn 16 that has been beaten.
【0015】この実施例の緯糸検知装置11の検知回路
は、図1に示すように、発光素子23には、駆動アンプ
30の出力が接続され、織機の運転中は常時発光するよ
うに設けられている。また、受光素子25は、オペアン
プ等のアンプ32の入力側に接続されている。アンプ3
2の出力は、信号変化率検出手段としての微分器34を
経て、オペアンプ等から成る比較器36の非反転入力端
子に接続されている。また、比較器36の反転入力端子
は、所定の基準電圧Vrefを介して接地されている。比
較器36の出力は、アンドゲート38に接続されてい
る。そして、図示しない織機の製織動作に対応して、所
定のタイミングでON,OFFを繰り返すタイミング信
号が、アンドゲート38に接続されている。この所定の
タイミング信号のON期間は、緯糸16が検知部21を
通過する時期を挟んだ期間であり、例えば、緯入れ完了
時点から筬打ち時点までの期間である。As shown in FIG. 1, the detection circuit of the weft detection device 11 of this embodiment is provided with a light emitting element 23 to which the output of a drive amplifier 30 is connected so that the light emission element 23 always emits light during operation of the loom. ing. The light receiving element 25 is connected to the input side of an amplifier 32 such as an operational amplifier. Amplifier 3
The output of 2 is connected to the non-inverting input terminal of a comparator 36 including an operational amplifier or the like via a differentiator 34 as a signal change rate detecting means. The inverting input terminal of the comparator 36 is grounded via a predetermined reference voltage V ref . The output of the comparator 36 is connected to the AND gate 38. A timing signal that repeats ON and OFF at a predetermined timing is connected to the AND gate 38 in response to the weaving operation of the loom (not shown). The ON period of the predetermined timing signal is a period between the times when the weft yarn 16 passes through the detection unit 21, and is, for example, a period from the completion of the weft insertion to the beating time.
【0016】この実施例の緯糸検知装置11の動作につ
いて、図2に基づいて説明する。先ず、織機の運転中
は、常時、発光素子23から光が発せられ、光ファイバ
22,24を介して受光素子25は、常時受光状態にあ
り、受光による出力信号を出している。この状態で、所
定の緯入れタイミングで緯糸16が緯入れされ、筬12
により筬打ちされると、緯糸16は、スリット18の光
ファイバ22,24の端面間を通過する。これによっ
て、緯糸16が、発光素子23からの光を遮り、受光素
子25の出力信号はアンプ32を経て出力される。アン
プ32の出力信号Aは、図2の模式的波形にに示すよう
に、光が遮られた期間T1だけ出力が減少する。そし
て、微分器34では、信号Aの変化率に対応した微分信
号Bを出力し、この微分信号Bが比較器36に入力し、
所定の基準電圧Vrefと比較される。The operation of the weft detecting device 11 of this embodiment will be described with reference to FIG. First, during operation of the loom, light is constantly emitted from the light emitting element 23, and the light receiving element 25 is always in the light receiving state via the optical fibers 22 and 24, and outputs an output signal by the light reception. In this state, the weft 16 is inserted at a predetermined weft insertion timing, and the reed 12
When beaten by, the weft yarn 16 passes between the end faces of the optical fibers 22 and 24 of the slit 18. As a result, the weft thread 16 blocks the light from the light emitting element 23, and the output signal of the light receiving element 25 is output via the amplifier 32. The output of the output signal A of the amplifier 32 decreases as shown in the schematic waveform of FIG. 2 for the period T 1 during which the light is blocked. Then, the differentiator 34 outputs a differential signal B corresponding to the rate of change of the signal A, and the differential signal B is input to the comparator 36,
It is compared with a predetermined reference voltage V ref .
【0017】ここで、この基準電圧Vrefは、アンプ3
2により増幅された受光素子25の出力信号を微分した
信号Bのうち、緯糸16が検知部21を抜け出る際に得
られる信号と同じ符号の側、この実施例ではプラス側に
設定されている。また、そのレベルは、緯糸16がスリ
ット18間の検知部21を抜け出る際に得られる信号レ
ベル以内であって、他のノイズ成分による微分値以上の
値に設定されている。そして、比較器36の出力Cは、
この緯糸16が検知部21から抜け出る際の信号Aの微
分信号Bが、基準電圧Vrefより大きいときに(H)、
低いときが(L)となる。Here, the reference voltage V ref is the amplifier 3
The signal B obtained by differentiating the output signal of the light receiving element 25 amplified by 2 is set to the same sign side as the signal obtained when the weft yarn 16 leaves the detection unit 21, that is, the plus side in this embodiment. Further, the level is set within a signal level obtained when the weft yarn 16 leaves the detection unit 21 between the slits 18 and is a value equal to or higher than a differential value due to other noise components. The output C of the comparator 36 is
When the differential signal B of the signal A when the weft 16 comes out of the detector 21 is larger than the reference voltage V ref (H),
When it is low, it becomes (L).
【0018】次に、この出力信号Cは、アンドゲート3
8に入力される。アンドゲート38には、織機の製織運
動に同期したタイミング信号であって、緯入れ完了時点
から筬打ち時点までの期間T2の間(H)となる緯糸検
知タイミング信号が入力する。この緯糸検知タイミング
信号は、緯入れ時の緯糸検知期間を定めるもので、筬打
ち時に緯糸16がスリット18を通過する際の上記期間
T1を含む期間である。このアンドゲート38の出力
が、緯糸検知信号Dとして、図示しない織機制御装置に
出力される。Next, the output signal C is supplied to the AND gate 3
8 is input. A weft detection timing signal, which is a timing signal in synchronization with the weaving motion of the loom and which is (H) during a period T 2 from the time when the weft insertion is completed to the time when the beating is performed, is input to the AND gate 38. This weft detection timing signal determines the weft detection period during weft insertion and is a period that includes the period T 1 when the weft 16 passes through the slit 18 during beating. The output of the AND gate 38 is output as a weft detection signal D to a loom control device (not shown).
【0019】これにより、正常に緯糸16がスリット1
8の検知部21を通過した場合、受光素子25の出力信
号Aの変化が比較的急峻であり、緯糸16が検知部21
から抜け出る際の微分器34の出力Bが、基準電圧V
refより高い値が得られ、比較器36の出力Cが(H)
となり、アンドゲート38を経て、緯糸16が正常に通
過したことを示す緯糸検知信号Dが出力される。As a result, the weft yarn 16 is normally slit 1
When passing through the detector 21 of No. 8, the change of the output signal A of the light receiving element 25 is relatively steep, and the weft 16 is detected by the detector 21.
The output B of the differentiator 34 when exiting from the reference voltage V
A value higher than ref is obtained, and the output C of the comparator 36 is (H).
Then, through the AND gate 38, a weft detection signal D indicating that the weft 16 has normally passed is output.
【0020】これに対し、スリット18の検知部21を
緯糸16が横切ったものではない場合、例えば、検知部
21の水の揺らぎにより受光素子25の出力に変化が生
じた場合は、信号Aは比較的緩やかな変動の波形とな
り、微分器34の出力Bは、基準電圧Vref以下の信号
しか得られない。従って、比較器36の出力信号Cは
(L)のままであり、アンドゲート38からは緯糸検知
信号は発生されない。同様に、スリット18の検知部2
1から水が流出する際の受光素子25の出力信号Aの変
動も、比較的緩やかであり、微分器34の出力Bは、基
準電圧Vref以下の信号しか得られない。また、スリッ
ト18の検知部21に、水が飛び込んできた場合は、仮
に出力信号Aの変化率が急激であったとしても、その時
の微分器34の出力Bが、基準電圧Vrefとは反対の符
号となるので確実に除外される。On the other hand, when the weft 16 does not cross the detecting portion 21 of the slit 18, for example, when the fluctuation of water in the detecting portion 21 causes a change in the output of the light receiving element 25, the signal A is The waveform has a relatively gradual fluctuation, and the output B of the differentiator 34 can obtain only a signal equal to or lower than the reference voltage V ref . Therefore, the output signal C of the comparator 36 remains (L), and the weft detection signal is not generated from the AND gate 38. Similarly, the detection unit 2 of the slit 18
The fluctuation of the output signal A of the light receiving element 25 when water flows out of 1 is also relatively gradual, and the output B of the differentiator 34 is only a signal equal to or lower than the reference voltage V ref . Further, when water jumps into the detection unit 21 of the slit 18, even if the rate of change of the output signal A is rapid, the output B of the differentiator 34 at that time is opposite to the reference voltage V ref. It is surely excluded because it becomes the sign of.
【0021】この実施例の緯糸検知装置11によれば、
緯糸16の通過とスリット18の検知部21の水の揺ら
ぎや水の出入り等による信号とが確実に区別され、正確
な緯入れ検知が可能なものである。According to the weft detecting device 11 of this embodiment,
The passing of the weft yarn 16 and the signal due to the fluctuation of the water of the detecting portion 21 of the slit 18 and the comings and goings of the water are surely distinguished, and accurate weft insertion detection is possible.
【0022】次にこの発明の第二実施例の緯糸検知装置
について、図5,図6を基にして説明する。ここで、上
記第一実施例と同様の部材は同一符号を付して説明を省
略する。この実施例の緯糸検知装置11は、アンプ32
の出力が、第一実施例と同様に微分器34に入力された
後、微分器34の出力信号が積分回路を有した積分器4
0に入力されているものである。微分器34と積分器4
0との間には、信号選別手段であるダイオード42が並
列に設けられ、緯糸16が光ファイバ22,24の端面
が位置した検知部21から抜け出る時に得られる側の符
号の信号、この実施例では、プラス側の信号のみが積分
器40に入るようにしている。Next, a weft detecting device according to a second embodiment of the present invention will be described with reference to FIGS. Here, the same members as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. The weft detection device 11 of this embodiment includes an amplifier 32.
After the output of is input to the differentiator 34 as in the first embodiment, the output signal of the differentiator 34 has an integrator 4 having an integrating circuit.
It has been input to 0. Differentiator 34 and integrator 4
A diode 42, which is a signal selection means, is provided in parallel with 0, and the signal of the sign on the side obtained when the weft thread 16 exits from the detection section 21 where the end faces of the optical fibers 22 and 24 are located. Then, only the signal on the plus side is allowed to enter the integrator 40.
【0023】この実施例の比較器36に設定されている
基準電圧Vrefは、アンプ32により増幅された受光素
子25の出力信号を微分した信号Bのうち、緯糸16が
光ファイバ22,24の端面から抜け出る時に得られる
信号Bに対する積分信号Eのレベル以内であって、他の
ノイズ成分の積分値以上の値に設定されている。The reference voltage V ref set in the comparator 36 of this embodiment is the signal B obtained by differentiating the output signal of the light receiving element 25 amplified by the amplifier 32, and the weft 16 is the optical fiber 22, 24 of the optical fiber 22, 24. It is set within the level of the integrated signal E with respect to the signal B obtained when exiting from the end face, and is set to a value equal to or higher than the integrated value of other noise components.
【0024】この実施例の緯糸検知装置11の動作は、
上記実施例と同様であるが、比較器36に入力される信
号が、微分器34のプラス側の信号を積分器40により
積分した信号である。この積分器40により積分した信
号により、基準電圧Vrefと比較して、緯糸16がスリ
ット18間の検知部21を抜け出る際に得られる信号を
確実に検知している。The operation of the weft detecting device 11 of this embodiment is as follows.
Similar to the above embodiment, the signal input to the comparator 36 is the signal obtained by integrating the plus-side signal of the differentiator 34 by the integrator 40. With the signal integrated by the integrator 40, the signal obtained when the weft 16 exits the detection unit 21 between the slits 18 is reliably detected by comparison with the reference voltage V ref .
【0025】これは、緯糸16がスリット18の検知部
21を通過する速度が遅くなる場合にも、確実に緯糸の
みを検知するようにしたものである。即ち、緯糸16
が、普通にスリット18の検知部21を通過する場合、
図6の信号Aの実線で示すような波形になり、上記第一
実施例の緯糸検知装置でも何ら問題なく正確に緯糸16
の通過を検知することができる。しかし、場合によって
は、図6の二点鎖線に示すように、緯糸16の通過時間
が長くなる場合がある。This is to ensure that only the weft yarn is detected even when the speed at which the weft yarn 16 passes through the detecting portion 21 of the slit 18 becomes slow. That is, weft 16
However, when it normally passes through the detection unit 21 of the slit 18,
The signal A has a waveform as shown by the solid line in FIG. 6, and the weft detecting device of the first embodiment described above can accurately weft 16 without any problems.
It is possible to detect the passage of. However, in some cases, as shown by the chain double-dashed line in FIG. 6, the passing time of the weft yarn 16 may be long.
【0026】これは、図8に示すように、緯糸16が筬
12に押されて検知部21を通過する際に、緯糸16が
検知部21内の水の抵抗や、スリット18の摺動面での
抵抗により、緯糸に略U字状に緩みが生じるからであ
る。この緩みがあると、筬12が緯糸検知装置11を通
過する時点よりもわずかに遅れて緯糸16が検知部21
を通過することになる。一方、筬打ち運動の筬12の速
度は、サインカーブを描く速度であり、筬12が織前に
近付くほど速度が遅くなり、筬打ち後に移動方向が反転
するものである。従って、緯糸16に、移動方向に対し
て後方側に緩みがあると、緯糸16が検知部21を通過
するタイミングが遅くなり、緯糸16は筬12に押され
て移動するので、筬12の速度が遅くなった時点で緯糸
16が検知部21を通過することになる。そして、筬1
2の速度が遅くなった時点で緯糸16が検知部21から
抜け出ると、図6の二点鎖線示すように、信号Aの立ち
上がり側の傾きが緩やかなものとなり微分信号Bのレベ
ルも相対的に低いものとなってしまう。As shown in FIG. 8, when the weft 16 is pushed by the reed 12 and passes through the detection section 21, the weft 16 has resistance to water in the detection section 21 and a sliding surface of the slit 18. This is because the resistance of the weft causes the weft to loosen in a substantially U shape. When there is this looseness, the weft 16 is detected by the detection unit 21 slightly later than when the reed 12 passes through the weft detection device 11.
Will pass through. On the other hand, the speed of the reed 12 in the beating operation is a speed that draws a sine curve, the speed becomes slower as the reed 12 approaches the cloth fell, and the moving direction is reversed after the beating. Therefore, if the weft thread 16 is loose on the rear side with respect to the moving direction, the timing at which the weft thread 16 passes the detection unit 21 is delayed, and the weft thread 16 is pushed by the reed 12 to move, so that the speed of the reed 12 is increased. The weft thread 16 passes through the detection section 21 at a time point when the movement is delayed. And reed 1
When the weft thread 16 comes out of the detection section 21 at the time when the speed of 2 becomes slow, the rising edge of the signal A becomes gentle and the level of the differential signal B becomes relatively high as shown by the chain double-dashed line in FIG. It will be low.
【0027】一方、緯糸16は、必ず、検知部21を横
切っていくものであり、移動速度が遅くなっても、その
分、検知部21から抜け出るまでの時間がより長くなっ
ている。従って、微分信号Bのレベルが低くても、緯糸
16が抜け出る際の信号Aの微分信号Bが出力されてい
る期間の積分値を取れば、微分信号の大小にかかわら
ず、緯糸16が抜け出た際の積分信号は一定値以上の比
較的大きな値が得られるものである。そして、この積分
信号を基に、上述のように基準電圧Vrefを設定するこ
とにより、確実に緯糸16の通過を検知することができ
るものである。On the other hand, the weft yarn 16 always crosses the detecting portion 21, and even if the moving speed becomes slower, the time until it comes out of the detecting portion 21 becomes longer accordingly. Therefore, even if the level of the differential signal B is low, if the integral value of the period of time during which the differential signal B of the signal A when the weft 16 is slipping out is taken, the weft 16 slips out regardless of the magnitude of the differential signal. The integral signal at this time is a signal that can obtain a relatively large value of a certain value or more. Then, by setting the reference voltage V ref as described above based on this integrated signal, it is possible to reliably detect the passage of the weft yarn 16.
【0028】この実施例の緯糸検知装置によれば、緯入
れは正常に行なわれているが緯糸がスムーズに検知部2
1を通過せず、検知信号Aがゆるやかな変化をした場合
にも、確実に緯入れを検知し、誤った緯入れミス信号を
出力することがない。According to the weft detecting device of this embodiment, the weft insertion is normally performed, but the weft is detected smoothly.
Even when the detection signal A does not pass 1 and the detection signal A changes gently, weft insertion is surely detected and an incorrect weft insertion error signal is not output.
【0029】なお、この発明の緯糸検知装置は、緯糸の
光学的検知に際して、光電センサの出力の変化率を検知
し、この変化率のうち緯糸が検知部から抜け出る際の信
号を基にして、緯糸の検知を行っているものであれば良
く、発光素子や受光素子の種類は問わないものである。
また、この発明の検知部は、図7に示すように、光透過
部材としての光ファイバの一端が緯糸通過軌跡に面して
並設して形成された反射型のものであっても良く、さら
に必要に応じて緯糸通過軌跡を挟んで各光ファイバと対
面して、黒色または白色や鏡面等の光反射部26が形成
されたものでも良い。The weft detecting device of the present invention detects the rate of change of the output of the photoelectric sensor during the optical detection of the weft, and based on the signal of the rate of change of the output of the weft, the change rate of the output of the photoelectric sensor is detected. Any type of light emitting element or light receiving element may be used as long as it is capable of detecting the weft.
Further, as shown in FIG. 7, the detection unit of the present invention may be a reflection type in which one end of an optical fiber as a light transmission member is arranged in parallel so as to face the weft passage locus, Further, a light reflecting portion 26 of black, white, mirror surface or the like may be formed facing each optical fiber with a weft passing locus interposed therebetween if necessary.
【0030】また光透過部材は、光ファイバの他にレン
ズやミラーの組み合わせであっても良く、発光素子と受
光素子の前面に別体に又は一体的に設けられたガラス又
は透明樹脂等の部材であっても良い。さらに、これら光
透過部材を省略して、発光素子及び受光素子を直接緯糸
通過軌跡に面して設けても良い。また、発光素子は、織
機の運転中に常時発光させるのに代えて、緯糸検知のた
めに必要な期間のみ、例えば、緯糸検知タイミング信号
を入力している期間のみ発光させるようにしても良い。
同様に、受光素子もまた、緯糸検知のために必要な期間
のみ作動させるようにしても良い。さらに、前掲の特公
昭57−13653号公報のものと同様に、スリット1
8の、検知部21に噴射水が直接飛び込むのを防止する
ために、スリット18の緯入れ側に適宜形状の遮蔽板を
設けても良い。The light transmitting member may be a combination of a lens and a mirror other than an optical fiber, and is a member such as glass or transparent resin provided separately or integrally on the front surface of the light emitting element and the light receiving element. May be Further, these light transmitting members may be omitted, and the light emitting element and the light receiving element may be provided directly facing the weft passing locus. Further, the light emitting element may emit light only during a period necessary for weft detection, for example, during a period when a weft detection timing signal is input, instead of constantly emitting light during operation of the loom.
Similarly, the light receiving element may also be operated only during a period necessary for weft detection. Further, as in the case of the above-mentioned Japanese Patent Publication No. 57-13653, the slit 1
In order to prevent the jet water from directly splashing into the detection unit 21 of 8, a shielding plate of an appropriate shape may be provided on the weft insertion side of the slit 18.
【0031】[0031]
【発明の効果】この発明の水噴射式織機の緯糸検知装置
は、信号変化率検出手段により得られた信号のうち、緯
糸が検知部から抜け出る際の信号を基にして、所定の基
準値と比較しているので、水等による緯糸の誤検知がな
く、正確な緯糸検知が可能となるものである。According to the weft detection device for a water jet loom of the present invention, a predetermined reference value is set based on the signal obtained when the weft thread exits from the detection section among the signals obtained by the signal change rate detection means. Since the comparison is made, there is no erroneous detection of the weft due to water or the like, and accurate weft detection is possible.
【0032】また、特に、信号変化率検出手段により得
られた信号のうち、緯糸が検知部から抜け出る際の信号
をさらに積分して、所定の基準値と比較することによ
り、緯糸通過速度が遅い場合にも、緯糸通過を検知でき
ないということがなく、しかも水等による緯糸の誤検知
がなく、より正確な緯糸検知が可能となるものである。Further, in particular, among the signals obtained by the signal change rate detecting means, the signal when the weft yarn exits from the detecting portion is further integrated and compared with a predetermined reference value, whereby the weft yarn passing speed is low. Even in this case, it is possible to detect the weft thread more accurately, without being unable to detect the weft thread passing through, and without erroneous detection of the weft thread due to water or the like.
【図1】この発明の緯糸検知装置の第一実施例の緯糸検
知回路の回路図である。FIG. 1 is a circuit diagram of a weft detection circuit of a first embodiment of a weft detection device of the present invention.
【図2】この発明の第一実施例の緯糸検知回路の動作を
示すタイムチャートである。FIG. 2 is a time chart showing the operation of the weft detection circuit of the first embodiment of the present invention.
【図3】この実施例の緯糸検知装置を示す部分斜視図で
ある。FIG. 3 is a partial perspective view showing a weft detection device of this embodiment.
【図4】この実施例の緯糸検知装置を示す平面図であ
る。FIG. 4 is a plan view showing a weft detection device of this embodiment.
【図5】この発明の緯糸検知装置の第二実施例の検知回
路の回路図である。FIG. 5 is a circuit diagram of a detection circuit of a second embodiment of the weft detection device of the present invention.
【図6】この発明の第二実施例の緯糸検知回路の動作を
示すタイムチャートである。FIG. 6 is a time chart showing the operation of the weft detection circuit of the second embodiment of the present invention.
【図7】この発明の緯糸検知装置の変形例を示す図であ
る。FIG. 7 is a diagram showing a modification of the weft detection device of the present invention.
【図8】この発明の織機の筬打ち時の緯糸の緩みを説明
する図である。FIG. 8 is a diagram for explaining looseness of the weft yarn when beating the loom of the present invention.
11 緯糸検知装置 16 緯糸 18 スリット 20 保持部材 21 検知部 22,24 光ファイバ(光透過部材) 23 発光素子 25 受光素子 30,32 アンプ 34 微分器 36 比較器 40 積分器 11 Weft detection device 16 Weft 18 Slit 20 Holding member 21 Detection unit 22, 24 Optical fiber (light transmission member) 23 Light emitting element 25 Light receiving element 30, 32 Amplifier 34 Differentiator 36 Comparator 40 Integrator
Claims (4)
して設けられた光電センサと、上記光電センサから得ら
れた信号の変化率を検出する信号変化率検出手段と、こ
の信号変化率検出手段により得られた信号のうち上記光
電センサの検知部から上記緯糸が抜け出る際に得られる
信号の値を、所定の基準値と比較して緯入れ成否の判定
信号を出力する比較手段とを設けた水噴射式織機の緯糸
検知装置。1. A photoelectric sensor provided so as to face a locus through which a weft yarn to be beaten passes, a signal change rate detecting means for detecting a change rate of a signal obtained from the photoelectric sensor, and this signal change rate. Of the signals obtained by the detection means, the value of the signal obtained when the weft yarn exits from the detection part of the photoelectric sensor is compared with a predetermined reference value, and a comparison means for outputting a weft insertion success / failure determination signal. A weft detection device for a water-jet loom provided.
して設けられた光電センサと、上記光電センサから得ら
れた信号の変化率を検出する信号変化率検出手段と、こ
の信号変化率検出手段からの信号のうち上記光電センサ
の検知部から上記緯糸が抜け出る際に得られる信号を積
分する積分手段と、この積分手段により得られた信号の
値を、所定の基準値と比較して緯入れ成否の判定信号を
出力する比較手段とを設けた水噴射式織機の緯糸検知装
置。2. A photoelectric sensor provided so as to face a trajectory through which a weft to be beaten passes, a signal change rate detecting means for detecting a change rate of a signal obtained from the photoelectric sensor, and the signal change rate. Of the signals from the detection means, an integration means for integrating the signal obtained when the weft yarn comes out of the detection part of the photoelectric sensor, and the value of the signal obtained by this integration means are compared with a predetermined reference value. A weft detection device for a water jet loom, which is provided with a comparison means for outputting a determination signal indicating whether or not the weft insertion has been successful.
からなり、上記検知部は各光ファイバの一端面が緯糸通
過軌跡に対面して形成され、各光ファイバの他端部には
各々発光素子と受光素子が配置されている請求項1又は
2記載の水噴射式織機の緯糸検知装置。3. The photoelectric sensor comprises a light emitting element and a light receiving element, and the detecting section is formed such that one end surface of each optical fiber faces a weft passing locus, and the other end portion of each optical fiber emits light. The weft detection device for a water jet loom according to claim 1 or 2, wherein an element and a light receiving element are arranged.
の間には、上記光電センサの検知部から上記緯糸が抜け
出る際に得られる信号と同じ符号の信号を通過させ逆の
信号を除去する信号選別手段が設けられている請求項2
又は3記載の水噴射式織機の緯糸検知装置。4. A signal having the same sign as the signal obtained when the weft thread exits from the detection section of the photoelectric sensor is passed between the signal change rate detecting means and the integrator, and an opposite signal is removed. 3. A signal selecting means for controlling is provided.
Alternatively, the weft detection device for the water jet loom according to Item 3.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP07394094A JP3246635B2 (en) | 1994-03-17 | 1994-03-17 | Weft detection device for water jet loom |
KR1019950005491A KR100341465B1 (en) | 1994-03-17 | 1995-03-16 | Weaving detection device of water jet loom |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP07394094A JP3246635B2 (en) | 1994-03-17 | 1994-03-17 | Weft detection device for water jet loom |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07258942A true JPH07258942A (en) | 1995-10-09 |
JP3246635B2 JP3246635B2 (en) | 2002-01-15 |
Family
ID=13532622
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP07394094A Expired - Fee Related JP3246635B2 (en) | 1994-03-17 | 1994-03-17 | Weft detection device for water jet loom |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP3246635B2 (en) |
KR (1) | KR100341465B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1025893C2 (en) * | 2004-04-07 | 2005-10-10 | Te Strake Textile B V | Water weaving device and a plunger pump for a water weaving device. |
CN102071519A (en) * | 2010-11-26 | 2011-05-25 | 浙江三禾纺织机械有限公司 | Numerical control system for water jet loom |
KR101371914B1 (en) * | 2010-11-26 | 2014-03-07 | 쓰다고마 고교 가부시끼가이샤 | Device for detecting the weft for water-jet type weaving machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100627861B1 (en) | 2005-08-22 | 2006-09-25 | 주식회사 매트릭스 | Weft sensing apparatus |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR930008445B1 (en) * | 1983-07-29 | 1993-09-04 | 오오티스 에레베이터어 캄파니 | Elevator buffer |
JPH0519343Y2 (en) * | 1987-05-27 | 1993-05-21 |
-
1994
- 1994-03-17 JP JP07394094A patent/JP3246635B2/en not_active Expired - Fee Related
-
1995
- 1995-03-16 KR KR1019950005491A patent/KR100341465B1/en not_active IP Right Cessation
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL1025893C2 (en) * | 2004-04-07 | 2005-10-10 | Te Strake Textile B V | Water weaving device and a plunger pump for a water weaving device. |
WO2005098111A1 (en) * | 2004-04-07 | 2005-10-20 | Te Strake Textile B.V. | Water jet loom as well as a plunger pump for use in a water jet loom |
CN102071519A (en) * | 2010-11-26 | 2011-05-25 | 浙江三禾纺织机械有限公司 | Numerical control system for water jet loom |
KR101371914B1 (en) * | 2010-11-26 | 2014-03-07 | 쓰다고마 고교 가부시끼가이샤 | Device for detecting the weft for water-jet type weaving machine |
Also Published As
Publication number | Publication date |
---|---|
KR100341465B1 (en) | 2002-10-31 |
JP3246635B2 (en) | 2002-01-15 |
KR950032775A (en) | 1995-12-22 |
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