200844285 九、發明說明 【發明所屬之技術領域】 本發明係有關根據申請專利範圍第1項前文之紗進給 裝置及根據申請專利範圍第1 6項前文之電光紗感測器。 【先前技術】 根據WO 0 0/4 8 934 A，紗進給裝置之電光紗感測器具 有一 LED (發光二極體）或雷射二極體，以作爲光源，該 雷射二極體亦即所謂VCSEL (垂直空腔表面射出雷射二 極體），可產生導至貯存體之反射掃瞄區上的狹窄錐形光 束。光束於掃瞄區上產生一實質上圓形，例如環形及小的 光點。掃瞄區逆反射，亦即，沿與光線照射到光掃瞄區者 相同的方向反射。反射紗掃瞄區沿貯存體之圓周方向凸形 弧曲，俾光點被略微擴展至一縱向或橢圓形光帶，惟被反 射至接收器。光點沿貯存體周面所載紗繞線之軸線方向擴 展。公告資料提到一實施例，其例如於以一發光二極體作 爲光源情況下，在光路中有一透鏡或光闌，俾在反射紗掃 瞄區上有一盡可能小且尖銳的光點。由於來自濃縮小光點 的反射光僅被凸形反射紗掃瞄區沿貯存體的圓周方向擴展 一點點，因此，需要較高精度來將光源及接收器適當定位 及對準。惟，不可避免的製造及裝配公差會劣化接收器的 讀取品質，並在一系列設有理論上相同之紗感測器之紗進 給裝置中造成嚴重的變動。 200844285 【發明內容】 本發明之目的在於提供如上述之紗進給裝置及電光紗 感測器，改進其接收器之讀取品質，其較習知技術更不易 受製造及裝配公差影響。 該目的藉申請專利範圍第1項之特點及申請專利範圍 第1 6項之特點達成。 設於光路中的透明擴展體驚人地改善接收器的讀取品 質，且更佳地彌補不可避免的製造及裝配公差。甚而。紗 感測器操作對發生於固定安裝之光源/接收器組合與貯存 體上反射紗掃瞄區間的不可避免相對運動一點都不敏感。 可想而知，本改進導因於以下事實，即透明擴展體業 已將藉來自光源之光束，沿貯存體之圓周方向基本上直線 地產生於擴展體上之小光點擴展成反射紗掃瞄區上之較長 銳光帶，光帶之縱軸基本上平行於裝載在貯存體上之紗繞 線的軸線。光帶中的光濃度很高，結果造成於反射至接收 器之光中之高濃度。接著，接收器接收透明擴展體重發射 至接收器之濃縮光，並因此，不管製造及裝配公差，亦不 管貯存體之不可避免相對運動，可靠地響應反射光。紗繞 線一到達反射紗掃瞄區之光帶之位置，任何來自光帶的反 射均強烈地被中斷，俾接收器可靠地響應所造成全光與陰 影條件間的局調變度。發自接收器的輸出信號很強，並因 此無需顯著放大。透明及實心擴展體業已將很小及濃縮光 點擴展成遠離反射紗掃瞄區的銳光帶，俾光帶於反射紗掃 瞄區上較窄惟較長。藉透明擴展體收集反射光，再度將其 -5- 200844285 轉換成實質上圓形，例如環形之反射光點，光線自該光點 行進至接收器。掃瞄區上的光帶越長，接收器所可評估及 處理的反射光即越佳。 顯著之透明擴展體之提供容許以尙可成本改進紗用感 測器之性能。紗用感測器不僅可於紗進給裝置中實施，且 可用於藉光反射操作之其他紗掃瞄應用。 較佳地，透明擴展體構成，其於二光方向同樣沿紗感 測器的光軸操作。藉透明擴展體收集自縱向光帶反射於掃 瞄區的大部分光線，並轉換成一實質上圓形光束，該光束 被導至光源/接收器組合之位置以驅動接收器。自基本上 圓形或環形並具有確保不管製造及裝配公差如何接收器可 靠地被反射光照到之尺寸之光點射出所收集的反射光。 於一方便實施例中，光源係一雷射光源，用來射出較 佳爲紅外線之略微錐形或環形雷射光束。由於光束強及較 低耗電，因此，雷射光源特別有利。 特別方便的是使用一垂直空腔表面射出雷射二極體（ VCSEL)作爲雷射光源。不同規格的VCSEL能以差強人 意的成本購得，具有長的使用壽命，並無問題地忍耐紗進 給裝置中不佳的作業條件。 替代地，光源可爲一發光二極體，其以發出略微錐形 的紅外線光束較佳。 經過證明，可購自美國，德州7 5 006，歐普帖克（ OPTEK )科技公司，型號爲OPB 609,OPB 609V的所謂“ 反射物感測器”用來實施於紗進給裝置很完美，其原因在 -6 - 200844285 於，反射物感測器於一小型塑膠外殼中，在 包含有並排之光源（紅外線發光二極體或 收器（NPN矽光電晶體），其等可容易例如 技術，安裝於一印刷電路板上。此等反射物 過擴散體的組合會造成特別是一紗進給裝置 最佳性能。光源與接收器間的距離以小於1 , 方便地，透明擴展體配置於光源/接收 區間的大約半途。該配置確保於二光方向的 。特別是，透明擴展體與反射掃瞄區間的距 效果，俾由光源所產生光點形成於透明擴展 的銳光線會於掃瞄區上形成較長且清楚的光 方便地，透明擴展體由具有最佳化光學 料射出成型。替代地，透明擴展體同樣可由 用來接收或發射光線之透明擴展體之表面零 或其他類型塗層覆蓋。 於一簡單實施例中，透明擴展體係一實 筒具有垂直於貯存體軸線並平行於貯存體周 圓筒軸。一簡單實心圓筒業已沿一方向將一 ~直線光線或光帶，並收集反射光，將所收 成實質上圓光點及一清楚光束，而發射至接 若透明擴展體係實心，且具有二徑向相 圓筒形表面區，該二表面區即具有至少實質 徑及筆直平行母線。於此情況下，曲率半徑 紗感測器之光軸之二表面區間的最大距離。 平行軸線上， VCSEL)及接 根據表面安裝 感測器型與透 中紗感測器的 0 m m較佳。 器組合與掃瞄 類似光學條件 離導致一放大 體之出口側上 帶。 性質的塑膠材 玻璃製成。未 件可藉光吸收 心圓筒，該圓 面上一切線之 圓光點轉換成 集反射光轉換 收器。 對並隔開之凸 上相同曲率半 等於或大於沿 具有等於或大 200844285 於沿光軸之表面區間距離之各圓筒形表面區之曲率半徑之 “壓擠”圓筒形表面區沿二方向處理光線，俾光線充份聚焦 至某一程度。 於另一方便實施例中，反射掃瞄表面由一插入貯存體 周面的反射體或由貯存體本身構成，例如於後一情況下’ 藉由提供一鏡面區於貯存體周面來構成。插入的反射體權 宜定位，俾當紗繞線於貯存體周面上被向前運送時，反射 體的外表面被紗繞線掃過。結果造成極佳的自行清潔效果 〇 一不可避免的相對運動主要沿貯存體的圓周方向發生 於光源/接收器組合與反射掃瞄區間，當光自一平面掃描 區反射時，此等相對運動可造成光振盪，較佳地，掃瞄區 沿圓周方向凸形弧曲，並具有一基本上平行於貯存體軸線 的母線。反射掃瞄區的凸形曲線以類似於貯存體周面的曲 線較佳。 爲改進反射掃瞄區的反射性質，於另一實施例中，反 射掃瞄區逆反射。逆反射意指大多數的光在其照射到掃瞄 區時被沿相同方向反射。 【實施方式】 圖1中之一紗進給裝置F，例如一用於織機之緯紗進 給裝置或一用於針織機之針織紗進給裝置包括一外殼1， 該外殼1包含一電動馬達2及一筒形貯存體3。惟，共同 作用之磁鐵3 ’阻止可旋轉地支承於一未圖示之驅動軸上 -8- 200844285 之貯存體3與驅動軸（固定貯存體）一起旋轉。於一未圖 示之替代例中，進給裝置可設有一可旋轉之貯存體。驅動 軸驅動一捲繞元件4，該捲繞元件4將一自左側插入紗進 給裝置F的紗Y捲入貯存體3之周面上的相鄰繞線。接 著，自貯存體3上面的最前方繞線退回紗，並隨意軸向穿 過一退繞小孔6。外殼具有一外殼托架5，於所示實施例 中，二電光紗感測器S固定地安裝於該外殼托架5中，此 等感測器自外部導入一例如由一插入貯存體3的反射體Μ 構成之反射掃瞄區1 2內。紗感測器S藉由信號發送與電 動馬達2之一控制單元C連接。控制單元C例如根據來 自紗感測器S的信號進行電動馬達2的控制以加速、減速 或停止電動馬達2，亦即驅動捲繞元件4，俾於貯存體周 面上有預定數目的繞線供使用。藉紗感測器S，以習知方 式掃瞄貯存於貯存體3上預定數目的繞線或預定大小的紗 〇 各紗感測器S包含至少一光源Ε及一接收器R。光源 Ε發射一略微錐形的光束至反射體Μ ;接收器R自反射體 Μ接收反射光。所射出的光束例如產生一光帶於反射體Μ 上，當一紗繞線通過時，該光帶被遮蔽。接收器R響應光 帶的遮蔽或出現，並分別產生一表示紗繞線之出現或消失 或通過的控制信號。 例如顯示於圖1中左側之紗感測器S可掃瞄貯存體3 上貯紗之最前方邊界位置。位於圖1中右側之紗感測器S 可掃瞄貯紗之一最大尺寸或各退繞紗繞線的通過。紗進給 -9- 200844285 裝置可設有單一紗感測器或二個以上紗感測器。應使用 類型之一附加紗感測器來偵測紗斷裂。甚至，可安裝一 感測器s於退繞小孔6之區域中。 光源E係一發光二極體（較佳爲紅外線）或一雷射 源L，較佳地爲一 VCSEL (垂直空腔表面射出雷射二極 )。接收器R爲一光二極體或光電晶體。特別有用的是 購自美國，德州75006，歐普帖克（OPTEK)科技公司 型號爲OPB 609,OPB 609V的所謂“反射物感測器”。此 反射物感測器顯示於圖8中，且係一光源/接收器組合8 由並排安裝於一塑膠外殼22中平行軸線上之一作爲IR 射器的紅外線發光二極體或一 VCSEL以及一 NPN矽光 晶體24構成。外殼22之外徑爲f =約3.2 mm，e = 2.7mm，意指光源E與接收器R間的距離小於1.0 mm。 各紗感測器S之零件係一由具有最佳化光學性質之 膠材料或玻璃製成。方便地’透明擴展體係一射出成型 膠零件。透明擴展體B安裝於光路或紗感測器s之光 中，光源/接收器組合8與反射體M的大約半途’亦即 光源/接收器組合8隔開’亦與貯存體3之反射掃瞄區 (紗通過間隙）隔開。光源/接收器組合8例如安裝於 殼托架5中一印刷電路板7上。透明擴展體B同樣可藉 固元件1〇及隔件11安裝於電路板7上。爲便於安裝透 擴展體B，擴展體8與安裝耳9形成爲一體。 於一未圖示之實施例中’透明擴展體B可爲真正實 圓筒，並以圓筒軸安裝於紗感 '測器之光軸中’俾圓筒軸 同 紗 光 髀 可 發 電 約 塑 塑 軸 與 12 外 緊 明 心 垂 -10- 200844285 直於貯存體軸線，並平行於貯存體周面上的切線。 惟，於圖2至7之實施例中’透明擴展體B具有“壓 擠”圓筒形狀，具有二徑向相對並隔開之凸圓筒形表面區 13，14，該二表面區具有至少基本上相同曲率半徑X及 筆直平行母線，該母線垂直於貯存體軸線’並平行於貯存 體周面上的切線。曲率半徑X等於或大於（如圖示）表 面區1 3，1 4間的最大距離。因此，光源/接收器組合8沿 紗感測器S之光軸方向之厚度約與曲率半徑X相同或甚 至於更小。 反射掃瞄區1 2係習知，亦即由貯存體周面上之一鏡 面或由圖示之插入反射體Μ構成。較佳地，反射掃瞄區 1 2之外表面與相鄰之貯存體3周面等高，俾紗繞線掃過 該表面而保持其乾淨。未用來供通過光線之透明擴展體Β 之表面部分可如圖3所示表面15覆蓋或塗布。 光源Ε射出略微錐形（約20°)光束16 (圖4)，該 光束1 6照射到表面區1 3並產生圓形或環形之光點1 7。 透明擴展體Β例如由其幾何形狀構成，其沿圓筒軸之方向 ，於下表面區14上擴展光點17，且（圖6)形成一軸向 光線1 7 ’，如1 9所示，光束繼續自光線1 7 ’前進，並照射 到掃瞄區1 2。於辱瞄區1 2 a產生一縱向銳光帶1 8 (圖5 )，其縱向延伸遠較光點1 7的尺寸大。光帶1 8的縱軸沿 圓周方向，亦即基本上平行於紗進給裝置操作期間內被沿 一箭頭方向25在反射掃瞄區1 2上方運送之各紗繞線之軸 線延伸。光帶1 8的縱向延伸L可例如與透明擴展體B的 -11 - 200844285 長度寺長，或甚至於更長。 圖3顯示於光源/接收器組合8中，光源E與接收器 R相互緊鄰配置。二者均面對透明擴展體B。 反射掃瞄區1 2較佳地沿貯存體3的圓周方向凸形弧 曲，較佳地具有與貯存體3周面相同的半徑X1。爲抑制 於貯存體3與外殼托架5間進給裝置之作業發生之不可避 免相對運動所造成反射光（圖7)的振盪，反射掃瞄區1 2 的曲率很有利。反射掃瞄區1 2可具有拋光精加工或鏡面 或甚至於逆反射。逆反射意指光在其照射到反射掃瞄區 1 2時被沿相同方向反射。 圖7顯示光20如何自光帶1 8反射回到透明擴展體B ，在此，光線照射到下圓筒形表面區1 4。透明擴展體B 構成其收集反射光20，並於上圓筒形表面區13形成一光 點（圓形或環形）‘，該光點類似於光點1 7且略大。自該 光點，反射光2 1被導至接收器R的位置。換言之，接收 器R於透明擴展體B之上圓筒形表面區13上呈現一清楚 圓形或環形光點或光環。 紗感測器S配置成當一紗繞線不在光帶！ 8的位置， 或當一紗繞線出現在光帶1 8的位置，或繞線通過時，響 應反射光20，21，亦即輸出信號。 透明擴展體B未必須具有如圖2至7所示形狀。替代 地，可使用具有上述性質，例如菱鏡透明體等的任何透明 擴展體B。 由於透明擴展體B產生一清楚且較長光帶18於反射 -12- 200844285 掃瞄區1 2上，並由於反射光可靠地返回接收器R，因此 ，光源/接收器組合8、透明擴展體B與反射掃瞄區1 2間 在幾何關係或光學鏈接之不可避免之製造及裝配公差均不 會劣化紗感測器的掃瞄特性或性能。 甚而，由於在反射掃瞄區12上清楚的長光帶18以及 透明擴展體B可靠地將反射光精密地重發射至接收器的特 性，因此，在一全光狀況與一陰影狀況（當一繞線遮蔽光 帶1 8時）間達到高調變，這意指即使於光路中有像棉絨 的污染，仍會獲得強輸出信號。強輸出信號無需重要的放 大措施。透明擴展體B係如VCSEL之成本尙可的組件， 這意指紗感測器能以尙可成本製造，可靠，並具有長的使 用壽命。 甚至可藉透明擴展體B回頭裝配業已實施的電光紗感 測器以改進紗感測器的性能。 於其他未圖示之被視爲當然的實施例中，可沿光路串 聯安裝一個以上擴展體，已達到相同功能，惟性能更高。 【圖式簡單說明】 將藉圖式說明本發明之一實施例。於圖式中： 圖1係設有二電光紗感測器之一紗進給裝置之示意側 視圖； 圖2係沿貯存體的圓周方向觀看，一部分爲剖視圖之 紗感測器之示意側視圖； 圖3係沿貯存體之軸向之紗感測器之視圖； -13- 200844285 圖4係類似於圖2之視圖，顯示自光源射出之光之光 路； 圖5係沿紗感測器之光軸方向之一反射掃瞄區的視圖 圖6係沿貯存體之軸向之紗感測器之視圖，顯示圖4 及圖5之光路； 圖7係沿貯存體之軸向之紗感測器之視圖，顯示反射 光之光路；以及 圖8係用於圖1至7之實施例中之光源/接收器組合 之示意平面圖。 [主要元件符號說明】 1 :外殼 2 :電動馬達 3 =貯存體 3 ’ ：共同作用磁鐵 4 :捲繞元件 5 :外殻托架 6 :退繞小孔 7 :電路板 8 :光源/接收器組合 9 :安裝耳 10 :緊固元件 1 1 :隔件 -14- 200844285 1 2 :反射掃瞄區 1 2 a :掃瞄區 13，14 :表面區 1 5 :表面 16 :光束 1 7 :光點 1 7 ’ ：軸向光線 18 :光帶 19 :光束 2 0，2 1 :反射光 22 :塑膠外殼 24 : NPN矽光電晶體 B :擴展體 C :控制單元 E :光源 F :紗進給裝置 L :縱向延伸 Μ :反射鏡 R :接收器 S :紗感測器 Υ ··紗[Technical Field] The present invention relates to a yarn feeding device according to the first aspect of the patent application and an electro-optic yarn sensor according to the first aspect of the patent application. [Prior Art] According to WO 0 0/4 8 934 A, an electro-optic yarn sensor of a yarn feeding device has an LED (light emitting diode) or a laser diode as a light source, and the laser diode is also The so-called VCSEL (vertical cavity surface exiting the laser diode) produces a narrow cone of light that is directed onto the reflective scan area of the reservoir. The beam produces a substantially circular shape, such as a ring and a small spot, on the scanning zone. The scanning area is retroreflected, that is, reflected in the same direction as the light is incident on the light scanning zone. The reflective yarn scanning zone is convexly curved along the circumference of the reservoir, and the pupil point is slightly expanded to a longitudinal or elliptical strip, but is reflected to the receiver. The spot spreads along the axis of the yarn winding on the peripheral surface of the reservoir. The publication mentions an embodiment in which, for example, with a light-emitting diode as a light source, there is a lens or aperture in the optical path, and the pupil has a spot that is as small and sharp as possible on the scanning area of the reflected yarn. Since the reflected light from the concentrated small spot is only slightly expanded by the convex reflection yarn scanning area in the circumferential direction of the storage body, higher precision is required to properly position and align the light source and the receiver. However, unavoidable manufacturing and assembly tolerances can degrade the read quality of the receiver and cause significant variations in a series of yarn feed devices that have theoretically identical yarn sensors. SUMMARY OF THE INVENTION It is an object of the present invention to provide a yarn feed device and an electro-optic yarn sensor as described above which improve the reading quality of the receiver, which is less susceptible to manufacturing and assembly tolerances than conventional techniques. This objective is achieved by the characteristics of the first paragraph of the patent application scope and the characteristics of the patent application scope. The transparent extensions provided in the optical path surprisingly improve the read quality of the receiver and better compensate for the inevitable manufacturing and assembly tolerances. even. Yarn sensor operation is not sensitive to the inevitable relative motion of the fixed source light/receiver combination and the reflected yarn scanning interval on the reservoir. It is conceivable that the improvement is due to the fact that the transparent expander has expanded the small light spot which is generated substantially linearly on the extended body along the circumferential direction of the storage body by the light beam from the light source into a reflected yarn scan. A longer sharp band on the zone, the longitudinal axis of the strip being substantially parallel to the axis of the yarn winding loaded on the reservoir. The concentration of light in the strip is high, resulting in a high concentration in the light reflected to the receiver. The receiver then receives the concentrated light from the transparent extended body weight to the receiver and, therefore, responds reliably to the reflected light regardless of manufacturing and assembly tolerances, regardless of the inevitable relative motion of the reservoir. As soon as the yarn winding reaches the position of the light strip of the reflected yarn scanning zone, any reflection from the light strip is strongly interrupted and the 俾 receiver reliably responds to the localized modulation between the full light and the shadow condition. The output signal from the receiver is strong and therefore does not require significant amplification. The transparent and solid extensions have expanded the small and concentrated spots into sharp bands away from the scanning area of the reflected yarn, which is narrower and longer on the scanning area of the reflective yarn. The reflected light is collected by the transparent extension, and its -5-200844285 is again converted into a substantially circular shape, such as a circular reflection spot, from which the light travels to the receiver. The longer the light band on the scan area, the better the reflected light that the receiver can evaluate and process. The provision of a significant transparent expander allows the performance of the yarn sensor to be improved at a cost. The yarn sensor can be implemented not only in the yarn feed device, but also in other yarn scanning applications that operate by light reflection. Preferably, the transparent expander is constructed to operate along the optical axis of the yarn sensor in the dimming direction. The transparent extension collects most of the light reflected from the longitudinal strip in the scanning zone and converts it into a substantially circular beam that is directed to the source/receiver combination to drive the receiver. The reflected light collected from a substantially circular or toroidal shape and having a spot that ensures that the receiver is reliably reflected by the light regardless of manufacturing and assembly tolerances. In a convenient embodiment, the light source is a laser source for emitting a slightly tapered or toroidal laser beam that is preferably infrared. Laser sources are particularly advantageous due to their strong beam and low power consumption. It is particularly convenient to use a vertical cavity surface to emit a laser diode (VCSEL) as a laser source. Different sizes of VCSELs are available at a cost that is unsatisfactory, have a long service life, and endure poor operating conditions in the yarn feed device without problems. Alternatively, the light source may be a light emitting diode which preferably emits a slightly cone shaped infrared beam. Proven, it can be purchased from the United States, Texas 7 5 006, OPTEK technology company, model OPB 609, OPB 609V so-called "reflector sensor" is used to implement the yarn feeding device is perfect, its The reason is in -6 - 200844285. The reflector sensor is in a small plastic case and contains a side-by-side light source (infrared light-emitting diode or receiver (NPN矽 photoelectric crystal), which can be easily installed, for example, technology. On a printed circuit board, the combination of such reflectors over the diffuser will result in optimum performance, especially for a yarn feed device. The distance between the light source and the receiver is less than one. Conveniently, the transparent extension is placed in the light source / About halfway of the receiving interval. This configuration is ensured in the direction of the two light directions. In particular, the distance between the transparent extension body and the reflective scanning section is such that the light spot generated by the light source is formed on the transparent extended sharp light to be on the scanning area. It is convenient to form a long and clear light, and the transparent expander is injection molded with an optimized optical material. Alternatively, the transparent expander can also be a transparent expander for receiving or emitting light. Face zero or other type of coating is covered. In a simple embodiment, the transparent expansion system has a solid cylinder having a cylinder axis perpendicular to the axis of the storage body and parallel to the circumference of the storage body. A simple solid cylinder has been placed in one direction. Straight light or strip of light, and collecting the reflected light, and collecting the substantially circular spot and a clear beam, and emitting to the transparent extension system solid, and having a two-radial phase cylindrical surface area, the two surface areas Having at least a substantial diameter and a straight parallel busbar. In this case, the maximum distance between the two surface sections of the optical axis of the radius of curvature yarn sensor. Parallel axis, VCSEL) and the surface-mounted sensor type and through-neam The sensor 0 mm is preferred. The combination of the scan and the optical condition of the scan results in a band on the exit side of an enlarged body. The plastic material of the nature is made of glass. The light can absorb the core cylinder by light, and the circular spot of all the lines on the circle is converted into a reflected light conversion receiver. The "squeezed" cylindrical surface area of the pair of spaced apart convex curvatures is equal to or larger than the radius of curvature of each cylindrical surface area having a distance equal to or greater than 200844285 along the optical axis. The light is processed and the light is fully focused to a certain extent. In another convenient embodiment, the reflective scanning surface is formed by a reflector inserted into the periphery of the reservoir or by the reservoir itself, for example in the latter case by providing a mirrored area on the peripheral surface of the reservoir. The inserted reflector is preferably positioned so that when the yarn is wound forward on the peripheral surface of the reservoir, the outer surface of the reflector is swept by the yarn. The result is an excellent self-cleaning effect. An unavoidable relative motion mainly occurs in the light source/receiver combination and the reflection scanning interval along the circumferential direction of the storage body. When the light is reflected from a plane scanning area, the relative motion can be The light is oscillated. Preferably, the scanning zone is convexly curved in the circumferential direction and has a generatrix substantially parallel to the axis of the reservoir. The convex curve of the reflective scanning area is preferably similar to the curve of the peripheral surface of the reservoir. To improve the reflective properties of the reflective scan zone, in another embodiment, the reflective scan zone is retroreflected. Retroreflection means that most of the light is reflected in the same direction as it illuminates the scanning zone. [Embodiment] A yarn feeding device F in Fig. 1, for example, a weft feeding device for a loom or a knitting yarn feeding device for a knitting machine, comprises a casing 1 comprising an electric motor 2 And a cylindrical storage body 3. However, the cooperating magnet 3' prevents the storage body 3 rotatably supported on a drive shaft (not shown) -8- 200844285 from rotating together with the drive shaft (fixed storage body). In an alternative not shown, the feed device can be provided with a rotatable storage body. The drive shaft drives a winding element 4 which winds a yarn Y inserted into the yarn feeding device F from the left side into an adjacent winding on the circumferential surface of the storage body 3. Next, the yarn is retracted from the foremost winding on the upper side of the storage body 3, and is arbitrarily axially passed through an unwinding small hole 6. The housing has a housing carrier 5, in the illustrated embodiment, two electro-optic yarn sensors S are fixedly mounted in the housing carrier 5, the sensors being externally introduced, for example, by an insertion reservoir 3. The reflector Μ is formed in the reflection scanning area 1 2 . The yarn sensor S is connected to one of the control units C of the electric motor 2 by signal transmission. The control unit C performs control of the electric motor 2, for example, based on a signal from the yarn sensor S to accelerate, decelerate or stop the electric motor 2, that is, to drive the winding member 4, and has a predetermined number of windings on the peripheral surface of the storage body. For use. The yarn sensor S is used to scan a predetermined number of windings or predetermined sizes of yarns stored on the storage body 3 in a conventional manner. Each of the yarn sensors S includes at least one light source Ε and a receiver R. The light source Ε emits a slightly conical beam to the reflector Μ; the receiver R receives the reflected light from the reflector Μ. The emitted beam, for example, produces a band of light on the reflector, which is obscured as a yarn passes. The receiver R responds to the occlusion or presence of the light strip and produces a control signal indicative of the presence or absence or passage of the yarn winding, respectively. For example, the yarn sensor S shown on the left side in Fig. 1 can scan the foremost boundary position of the yarn storage on the storage body 3. The yarn sensor S located on the right side of Fig. 1 can scan the maximum size of one of the storage yarns or the passage of each unwinding yarn winding. Yarn Feed -9- 200844285 The unit can be equipped with a single yarn sensor or more than two yarn sensors. One of the types of yarn sensors should be used to detect yarn breakage. Even a sensor s can be mounted in the area of the unwinding aperture 6. Light source E is a light emitting diode (preferably infrared) or a laser source L, preferably a VCSEL (vertical cavity surface emitting laser diode). The receiver R is a photodiode or a photonic crystal. Particularly useful is the so-called "reflector sensor" from OPTE 609, OPB 609V, which is available from OPTEK Technologies, USA, 75006. The reflector sensor is shown in FIG. 8 and is a light source/receiver assembly 8 which is mounted on a parallel axis of a plastic housing 22 side by side as an infrared light emitting diode or a VCSEL and an IR emitter. The NPN phosphor crystal 24 is constructed. The outer diameter of the outer casing 22 is f = about 3.2 mm, and e = 2.7 mm, which means that the distance between the light source E and the receiver R is less than 1.0 mm. The parts of each yarn sensor S are made of a glue material or glass having optimized optical properties. Conveniently, the transparent expansion system shoots the molded parts. The transparent extension B is mounted in the light of the optical path or the yarn sensor s, and the light source/receiver combination 8 is separated from the reflector M by about halfway 'that is, the light source/receiver combination 8' is also reflected by the reflection of the storage body 3. The aiming zones (yarns are separated by a gap). The light source/receiver assembly 8 is mounted, for example, on a printed circuit board 7 in the housing carrier 5. The transparent extension B can also be mounted on the circuit board 7 by means of the fastening element 1 and the spacer 11. In order to facilitate the installation of the permeable body B, the extension body 8 is formed integrally with the mounting ears 9. In an embodiment not shown, the transparent expander B can be a real solid cylinder and is mounted on the optical axis of the yarn feeler with a cylindrical shaft. Plastic shaft and 12 outer tight and clear heart -10- 200844285 Straight to the axis of the storage body and parallel to the tangent on the circumferential surface of the storage body. However, in the embodiment of Figures 2 to 7, the 'transparent expander B has a "squeezed" cylindrical shape having two diametrically opposed and spaced apart convex cylindrical surface regions 13, 14 having at least two surface regions having at least Substantially the same radius of curvature X and a straight parallel busbar that is perpendicular to the axis of the reservoir and parallel to the tangent to the circumferential surface of the reservoir. The radius of curvature X is equal to or greater than (as shown) the maximum distance between the surface regions 1 3, 14. Therefore, the thickness of the light source/receiver assembly 8 in the optical axis direction of the yarn sensor S is approximately the same as or even smaller than the radius of curvature X. The reflective scanning zone 12 is conventionally known, i.e., consisting of one of the mirror faces on the peripheral surface of the reservoir or the inserted reflector Μ shown. Preferably, the outer surface of the reflective scanning zone 1 2 is equal to the circumferential surface of the adjacent storage body 3, and the crepe winding is swept across the surface to keep it clean. The surface portion of the transparent body 未 which is not used for passing light can be covered or coated as shown in Fig. 3. The source illuminates a slightly cone (about 20°) beam 16 (Fig. 4) which illuminates the surface region 13 and produces a circular or circular spot 17. The transparent extension body is composed, for example, of its geometry, which expands the spot 17 on the lower surface region 14 in the direction of the cylinder axis, and (Fig. 6) forms an axial ray 17', as shown at 19. The beam continues to advance from the light 1 7 ' and illuminates the scanning zone 1 2 . A longitudinal sharp band 18 (Fig. 5) is produced in the insulting zone 1 2 a, and its longitudinal extension is much larger than the size of the spot 17. The longitudinal axis of the optical strip 18 extends in the circumferential direction, i.e., substantially parallel to the axis of each of the yarn windings transported over the reflective scanning zone 12 in an arrow direction 25 during operation of the yarn feed device. The longitudinal extension L of the light strip 18 can be, for example, longer than the length of the transparent extension B -11 - 200844285, or even longer. Figure 3 shows the light source/receiver combination 8 in which the source E and the receiver R are arranged next to one another. Both face transparent extension B. The reflective scanning zone 12 is preferably convexly curved in the circumferential direction of the storage body 3, preferably having the same radius X1 as the circumferential surface of the storage body 3. In order to suppress the oscillation of the reflected light (Fig. 7) caused by the inevitable relative movement of the feed device between the storage body 3 and the outer casing bracket 5, it is advantageous to reflect the curvature of the scanning zone 12. The reflective scan zone 12 can have a polished finish or mirror or even retroreflection. Retroreflection means that light is reflected in the same direction as it illuminates the reflective scan zone 12. Figure 7 shows how light 20 is reflected back from light strip 18 back to transparent expander B where it illuminates the lower cylindrical surface region 14 . The transparent expander B constitutes its collected reflected light 20, and forms a spot (circular or circular) in the upper cylindrical surface region 13, which is similar to the spot 17 and slightly larger. From this spot, the reflected light 21 is directed to the position of the receiver R. In other words, the receiver R presents a clear circular or annular spot or halo on the cylindrical surface region 13 above the transparent expander B. The yarn sensor S is configured such that when a yarn is wound, it is not in the light belt! The position of 8, or when a yarn winding occurs at the position of the light strip 18, or when the winding passes, responds to the reflected light 20, 21, that is, the output signal. The transparent expander B does not have to have a shape as shown in FIGS. 2 to 7. Alternatively, any transparent expander B having the above properties such as a magenta transparent body or the like can be used. Since the transparent extension body B produces a clear and long optical strip 18 on the reflection -12-200844285 scanning area 12, and since the reflected light reliably returns to the receiver R, the light source/receiver combination 8, the transparent extension body The inevitable manufacturing and assembly tolerances between B and the reflective scanning zone 1 in geometrical or optical links do not degrade the scanning characteristics or performance of the yarn sensor. Moreover, since the clear long light strip 18 and the transparent expander B on the reflective scanning area 12 reliably re-transmit the reflected light to the characteristics of the receiver, a full light condition and a shadow condition (when one When the winding shields the light strip from 1 to 8 hours, it achieves high modulation, which means that even if there is contamination like lint in the optical path, a strong output signal is obtained. Strong output signals do not require significant amplification. The transparent extension B is a cost-effective component of a VCSEL, which means that the yarn sensor can be manufactured at a cost, is reliable, and has a long service life. It is even possible to retrofit the electro-optic yarn sensor that has been implemented by the transparent extension B to improve the performance of the yarn sensor. In other embodiments not shown, which are considered to be of course, more than one extension can be installed in series along the optical path, and the same function has been achieved, but the performance is higher. BRIEF DESCRIPTION OF THE DRAWINGS An embodiment of the present invention will be described with reference to the drawings. In the drawings: Figure 1 is a schematic side view of a yarn feeding device provided with two electro-optic yarn sensors; Figure 2 is a schematic side view of a yarn sensor in a section view taken along the circumferential direction of the storage body Figure 3 is a view of the yarn sensor along the axial direction of the storage body; -13- 200844285 Figure 4 is a view similar to Figure 2, showing the light path of the light emitted from the light source; Figure 5 is along the yarn sensor View of one of the optical axis directions reflecting the scanning area. FIG. 6 is a view of the yarn sensor along the axial direction of the storage body, showing the optical path of FIGS. 4 and 5; FIG. 7 is a yarn sensing along the axial direction of the storage body. The view of the device shows the light path of the reflected light; and Figure 8 is a schematic plan view of the light source/receiver combination used in the embodiment of Figures 1-7. [Main component symbol description] 1 : Case 2 : Electric motor 3 = Storage body 3 ' : Co-acting magnet 4 : Winding element 5 : Housing bracket 6 : Unwinding hole 7 : Circuit board 8 : Light source / receiver Combination 9: Mounting ear 10: Fastening element 1 1 : Spacer-14- 200844285 1 2 : Reflective scanning area 1 2 a : Scanning area 13, 14: Surface area 1 5 : Surface 16: Beam 1 7 : Light Point 1 7 ': Axial light 18: Light band 19: Light beam 2 0, 2 1 : Reflected light 22: Plastic case 24: NPN 矽 Photoelectric crystal B: Extension C: Control unit E: Light source F: Yarn feed device L : longitudinal extension Μ : mirror R : receiver S : yarn sensor Υ · · yarn