EP2907908B1 - Capteur de déroulement de fil pour les prédélivreurs de stockage à tambour rotatif - Google Patents

Capteur de déroulement de fil pour les prédélivreurs de stockage à tambour rotatif Download PDF

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Publication number
EP2907908B1
EP2907908B1 EP14003877.9A EP14003877A EP2907908B1 EP 2907908 B1 EP2907908 B1 EP 2907908B1 EP 14003877 A EP14003877 A EP 14003877A EP 2907908 B1 EP2907908 B1 EP 2907908B1
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EP
European Patent Office
Prior art keywords
light
yarn
rotary drum
emitting means
drum
Prior art date
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Active
Application number
EP14003877.9A
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German (de)
English (en)
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EP2907908A1 (fr
Inventor
Giorgio Bertocchi
Mauro Varischetti
Pietro Zenoni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LGL Electronics SpA
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LGL Electronics SpA
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Publication of EP2907908A1 publication Critical patent/EP2907908A1/fr
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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D04B15/482—Thread-feeding devices comprising a rotatable or stationary intermediate storage drum from which the thread is axially and intermittently pulled off; Devices which can be switched between positive feed and intermittent feed
    • D04B15/486—Monitoring reserve quantity

Definitions

  • the present invention relates to a yarn-unwinding sensor for storage yarn feeders with rotary drum.
  • a storage yarn feeder is generally provided with a drum which has a plurality of yarn loops wound thereon which are adapted to be unwound upon request from a dowstream machine.
  • the yarn may be re-loaded either by a motorized swivel arm which rotates about an axis coaxial with the axis of the drum, or, in the case of feeders considered herein, by driving the drum to rotate, which drum, in this case, must be motorized.
  • the rotation of the motor is controlled in such a way as to maintain the amount of yarn substantially constant with respect to a predetermined amount which is wound on the drum during an initial loading procedure.
  • the feeder is provided with a sensor which is arranged at the delivery end of the drum and is provided with three, or even more, stationary photoelectric cells which are spaced at equal angles about the axis of the drum for detecting the unwinding yarn.
  • the control unit Based on the sequence of activation of the photoelectric cells, the control unit determinates wether the yarn is wound or unwound and controls the motor in such a way that, in a steady-state, the amount of yarn wound is equal to the amount of yarn unwound, so that the sensor does not detect any yarn unwinding. Therefore, in a steady-state, an outer observer will see the yarn substantially rotationally motionless, because the winding speed in one direction is equal to the unwinding speed in the opposite direction.
  • the senor is not capable, per se, of providing an absolute binary information about the amount of yarn which is unwound from the drum, but only a relative information based on the amount of yarn which is wound on it.
  • a storage yarn feeder 10 comprises a yarn-winding drum 12 having a plurality of loops of yarn Y wound thereon, which form a stock S and are adapted to be unwound upon request from a general downstream machine (not shown). As the yarn is unwound from drum 12, the latter is driven to rotate by a motor 14 to draw fresh yarn from a reel (not shown) and wind it upon itself in the form of new loops.
  • motor 14 is received in a motor-housing 16 of feeder 10, and comprises an annular stator 18 fixed within motor-housing 16, and a rotor 20 which is inserted into annular stator 18 and is fitted to a driving shaft 22.
  • Driving shaft 22 is supported within motor-housing 16 by a pair of rolling bearings 24, 26 and projects outside of motor-housing 16 with a projection 22a, which has drum 12 keyed thereto.
  • Drum 12 could incorporate a loop-separing device, which is known per se and does not fall within the scopes of the present invention; therefore, it is neither discussed nor shown herein for the sake of simplicity.
  • a delivery end portion 30 of drum 12 has a cylindrical surface 30a engaged by the unwinding yarn, and terminates with a rounded delivery edge 30b.
  • Feeder 10 is also provided with a braking device 32 known per se, which is supported by an arm 33 projecting from motor-housing 16 parallel to the axis of drum 12.
  • Braking device 32 comprises a hollow, frustoconical braking member 34 which is biased by elastic means 36 to coaxially abut with its inner surface against rounded delivery edge 30b of the drum, in order to apply a static braking action by friction upon the unwinding yarn.
  • the braking action is manually adjustable by a knob 38 which controls adjusting means 39 incorporated in arm 33, which are also known per se and therefore are not discussed in detail herein.
  • Yarn Y coming out from the feeder is guided by a yarn-guide eyelet O which is also supported by arm 33.
  • a control unit is programmed to drive motor 14 in such a way as to stabilize the stock on drum 12 on a predetermined optimal level.
  • the stock of yarn is determined on the basis of the number of loops which are unwound from drum 12 and the number of loops which are wound on it.
  • the number of loops which are wound on drum 12 can be calculated on the basis of either the speed of rotation or the position of motor 14, in a way known per se.
  • yarn feeer 10 is provided with a sensor 40 which comprises light-emitting means and light-receiving means, at least one of which is adapted to be attached to the drum, which operatively define a light connection passing through a detection area 30c of cylindrical surface 30a which is adapted to be repeteadly engaged by the yarn during its rotary, unwinding motion; accordingly, the unwinding of yarn is determined based on the variation of light resulting from the yarn transiting above detection area 30c.
  • a sensor 40 which comprises light-emitting means and light-receiving means, at least one of which is adapted to be attached to the drum, which operatively define a light connection passing through a detection area 30c of cylindrical surface 30a which is adapted to be repeteadly engaged by the yarn during its rotary, unwinding motion; accordingly, the unwinding of yarn is determined based on the variation of light resulting from the yarn transiting above detection area 30c.
  • the light-emitting means and the light-receiving means are both integral with the drum, and the light connection is closed by means of a reflecting surface arranged between the light source and the light receiver.
  • the light-emitting means and the light-receiving means respectively comprise an infrared light emitting diode 46 and an infrared light receiving diode 72 which are mounted within drum 12.
  • the two diodes are arranged with their axes which are slanting specularly with respect to a plane perpendicular to the axis of the drum, and are incident at an incidence point P which lies on detection area 30c of drum 12.
  • the diodes are mounted on a support 31 fixed to drum 12, and are operatively connected to a first circuit board 75 of the control unit, which is incorporated in drum 12 and is also fixed to support 31.
  • the two diodes are shielded by a window 86 made of a transparent material, e.g., glass, which is mounted on support 31 at the same level of cylindrical surface 30a.
  • an electromagnetic power supply unit 94 which comprises:
  • the power is transmitted from primary toroidal coil 94a to secondary toroidal coil 94b (which rotates) by magnetical induction. If there is no yarn at detection area 30c, the light beam generated by emitting diode 46 does not reach receiving diode 72 ( Fig. 2 ). When the yarn transits on detection area 30c at point P ( Fig. 3 ), the light beam I generated by emitting diode 46 is reflected by the yarn towards receiving diode 72.
  • the electronics on board of first circuit board 75 incorporated in drum 12 is programmed to process the variation of signal determined by the passage of the loop, and to generate a variation of the electrical load on secondary toroidal coil 94b. Such variation generates a variation in the current across primary toroidal coil 94a, which is measured and processed by the electronics on board of second circuit board 48 incorporated in arm 33.
  • the sensor according to the invention allows the number of unwinding yarns to be counted in absolute terms, regardless of the speed of rotation of the drum, rather that in relative terms with respect to the number of loops which are wound on the drum, as it occurs with the prior art discussed at the beginning of the present disclosure.
  • Figs. 4 and 5 show a further embodiment, which differs from the previous one in that the axes of emitting diode 146 and receiving diode 172 are incident at a point P' which is radially spaced from the surface of drum 112.
  • drum 112 is coaxially surrounded by an annular mirror 196 which is attached to arm 133 and has an inner, cylindrical reflecting surface 196a which cointains incidence point P' and faces outer cylindrical surface 130a of the drum.
  • the control unit If there is no yarn at the detection area 130c, the light beam generated by emitting diode 146 passes through window 186, hits annular mirror 196, and is reflected towards receiving diode 172 through window 186.
  • the yarn transiting on detection area 130c cuts off the light beam connection, thereby causing a variation of the signal.
  • This variation of the signal is processed by the control unit in a manner similar to the previous embodiment, but in this case the passage of yarn causes a signal cutoff rather than a signal activation.
  • Figs. 6 and 7 describe a further embodiment of the invention, in which the same electromagnetic power supply unit 294 of the two previous embodiments is used for powering the diodes and transmitting their signals.
  • an infrared light emitting diode 246 and an infrared light receiving diode 272 are mounted on a support 231 fixed within drum 212, and are both connected to a circuit board 275 which is incorporated in the drum and is also fixed to support 231.
  • emitting diode 246 is arranged in such a way as to emit an infrared light beam outwardly, in a radial direction at right angles to the axis of drum 212, via a radial through channel 278 of support 231 which leads to detection area 230c.
  • the axis of receiving diode 272 is parallel to the axis of the drum and intersects the axis of emitting diode 246 at an incidence point P".
  • Receiving diode 272 is received within a seat of support 231 which communicates with radial through channel 278 via a longitudinal channel 279.
  • support 231 houses a semi-reflecting mirror 266 inclined by 45°, in order to reflect a radial light beam coming from the outside towards receiving diode 272.
  • radial through channel 278 is externally closed by a window 286 made of glass, which is mounted to support 231 at the same level of cylindrical surface 230a.
  • Drum 212 is coaxially surrounded by a reflector 296 which is attached to arm 233 and has an inner, cylindrical reflective surface 296a facing cylindrical surface 230a of the drum.
  • the light beam generated by emitting diode 246 passes through mirror 266 - on the side facing away from the reflecting side - as well as window 286, hits reflector 296, and then is reflected in the same radial direction towards the reflecting side of mirror 266, through window 286.
  • Mirror 266 reflects the light beam towards receiving diode 272.
  • the yarn transiting above detection area 230c cuts off the light connection, thereby causing a variation of the signal which is processed by the control unit in a manner similar to the previous embodiment.
  • Figs. 8-10 show a further embodiment of the sensor according to the invention, in which, unlike the previous embodiments, only the light-emitting means are integral with drum 312, while the light receiving means are stationary, i.e., they are integral with the motor-housing and, in particular, are attached to arm 333.
  • the light-emitting means comprise an infrared light emitting diode 346, which is attached to the inner end of a tubular support 331 which extends radially within drum 312.
  • Tubular support 331 is closed at its inner end by a disc-shaped window 386 made of a transparent material, e.g., glass, which is arranged at the same level of outer cylindrical surface 330a at detection area 330c.
  • Emitting diode 346 is connected to a circuit board 375, which is incorporated within the drum and is also attached to support 331.
  • Emitting diode 346 is arranged in such a way as to generate an infrared light beam outwardly in the radial direction (i.e., at right angles to the axis of drum 312), through a spherical lens 382 which is housed within the tubular support for collimating the light generated by emitting diode 346.
  • the light-receiving means comprise a series of receiving diodes 372 which are mounted at equally-spaced radial positions on an annular circuit board 373 ( Fig. 10 ), so that they operatively face cylindrical surface 330a of drum 312.
  • Annular circuit board 373 surrounds drum 312 and is operatively connected to circuit board 348 incorporated in arm 333.
  • the sensor could also have an inverse configuration with respect to the last described embodiment, e.g., with a sole receiving diode integral with the drum and a plurality of emitting diodes mounted at equally-spaced angular positions on the annular circuit board.
  • a sole receiving diode integral with the drum and a plurality of emitting diodes mounted at equally-spaced angular positions on the annular circuit board.
  • the yarn-unwinding sensor could be located at an intermediate longitudinal position of the drum to be simply used as a stock sensor adapted to provide a binary information about the presence/absence of stock at a predetermined area of the drum.
  • the light-emitting means and the light-receiving means intercept the yarn upstream of the rounded delivery edge.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Forwarding And Storing Of Filamentary Material (AREA)

Claims (9)

  1. Dispositif d'amenée de fil de stockage (10) comprenant un tambour rotatif d'enroulement de fil motorisé (12) qui peut tourner par rapport à un carter moteur (16) et est adapté pour avoir une pluralité de boucles de fil (Y) enroulées sur lui-même, lesdites boucles étant adaptées pour être déroulées sur demande d'une machine en aval et
    un capteur de déroulement de fil comprenant des moyens d'émission de lumière (46, 146, 246) et des moyens de réception de lumière (72, 172, 272) qui définissent en fonctionnement une connexion de lumière passant par une zone de détection (30c) du tambour rotatif (12) qui est adaptée pour être engagée par répétition par le fil pendant son mouvement de déroulement rotatif, moyennant quoi le déroulement du fil du tambour rotatif est déterminé sur la base d'une variation du signal de lumière résultant du passage du fil (Y) au travers de ladite zone de détection (30c),
    caractérisé en ce qu'au moins un desdits moyens d'émission de lumière (46, 146, 246) et des moyens de réception de lumière (72, 172, 272) est fixé au tambour rotatif (12).
  2. Capteur de déroulement de fil selon la revendication 1, caractérisé en ce que lesdits moyens d'émission de lumière (46, 146, 246) et lesdits moyens de réception de lumière (72, 172, 272) sont tous les deux adaptés pour être fixés au tambour rotatif (12), ladite connexion de lumière étant adaptée pour être fermée en présence d'une surface de réflexion agencée en fonctionnement entre lesdits moyens d'émission de lumière et lesdits moyens de réception de lumière.
  3. Capteur de déroulement de fil selon la revendication 2, caractérisé en ce que les axes desdits moyens d'émission de lumière (46) et desdits moyens de réception de lumière (72) sont inclinés spéculairement par rapport à un plan perpendiculaire à l'axe du tambour rotatif (12) et se rencontrent sur un point d'incidence (P) qui se trouve sensiblement sur ladite zone de détection (30c), ladite surface de réflexion étant la surface du fil lorsqu'il engage ladite zone de détection (30c) sur le point d'incidence (P) et réfléchit le faisceau de lumière (I) desdits moyens d'émission de lumière (46) jusqu'auxdits moyens de réception de lumière (72).
  4. Capteur de déroulement de fil selon la revendication 2, caractérisé en ce que les axes desdits moyens d'émission de lumière (146) et desdits moyens de réception de lumière (172) sont inclinés spéculairement par rapport à un plan perpendiculaire à l'axe du tambour rotatif (12) et se rencontrent sur un point d'incidence (P') qui est radialement espacé de la surface du tambour rotatif (112), ladite surface de réflexion comprenant une surface de réflexion cylindrique (196a) qui entoure coaxialement le tambour rotatif (112) et contient ledit point d'incidence (P') de manière à réfléchir le faisceau de lumière (I) desdits moyens d'émission de lumière (46) auxdits moyens de réception de lumière (172).
  5. Capteur de déroulement de fil selon la revendication 2, caractérisé en ce que ledit moyen d'émission de lumière (246) est agencé pour générer un faisceau de lumière qui fait saillie radiale vers l'extérieur à angles droits par rapport à l'axe du tambour rotatif (212) et lesdits moyens de réception de lumière comprennent
    un récepteur de lumière (272), dont l'axe est parallèle à l'axe du tambour rotatif et rencontre l'axe du moyen d'émission de lumière (246) sur un point d'incidence (P") et
    un miroir à semi-réflexion (266) présentant un côté réfléchissant qui contient ledit point d'incidence (P") et est incliné à 45° pour réfléchir un faisceau de lumière venant radialement du côté extérieur vers ledit récepteur de lumière (272),
    ladite surface de réflexion comprenant une surface de réflexion cylindrique (296a) qui entoure coaxialement le tambour rotatif (212) pour la réflexion radiale du faisceau de lumière (I) dudit moyen d'émission de lumière (246) jusqu'audit côté de réflexion du miroir à semi-réflexion (266).
  6. Capteur de déroulement de fil selon la revendication 1, caractérisé en ce qu'un dudit moyen d'émission de lumière et dudit moyen de réception de lumière est adapté pour être fixé audit carter moteur (16) et présente une configuration annulaire (373) faisant face en fonctionnement à une surface annulaire (330a) du tambour rotatif (312) qui contient ladite zone de détection (330c).
  7. Capteur de déroulement de fil selon la revendication 6, caractérisé en ce que lesdits moyens d'émission de lumière (346) sont agencés pour émettre un faisceau de lumière à projection extérieure depuis ladite zone de détection (330c) et lesdits moyens de réception de lumière comprennent une pluralité de récepteurs de lumière (372) entourant le tambour rotatif (312) pour la réception dudit faisceau de lumière.
  8. Capteur de déroulement de fil selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'au moins l'un desdits moyens d'émission de lumière (46, 146, 246, 346) et desdits moyens de réception de lumière (72, 172, 272, 372) est alimenté par une unité d'alimentation en courant électromagnétique (94) et transmet des signaux via celle-ci, comprenant :
    - une bobine toroïdale principale (94a) formée intégralement et logée dans le boîtier de moteur (16) coaxialement au tambour rotatif (12) et
    - une bobine toroïdale secondaire (94b) formée intégralement et logée dans le tambour rotatif (12) en rapport avec une induction magnétique avec la bobine toroïdale principale (94a).
  9. Capteur de déroulement de fil selon l'une quelconque des revendications 1 à 8, caractérisé en ce que lesdits moyens d'émission de lumière et lesdits moyens de réception de lumière comprennent respectivement des diodes d'émission de lumière infrarouges (46, 146, 246, 346) et des diodes de réception de lumière infrarouges (72, 172, 272, 372).
EP14003877.9A 2014-02-13 2014-11-18 Capteur de déroulement de fil pour les prédélivreurs de stockage à tambour rotatif Active EP2907908B1 (fr)

Applications Claiming Priority (1)

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ITTO20140120 2014-02-13

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EP2907908B1 true EP2907908B1 (fr) 2016-06-22

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Publication number Priority date Publication date Assignee Title
CN106044361B (zh) * 2016-07-26 2019-01-11 西安坤蓝电子技术有限公司 一种用于两回转轴间导线往复退绕和卷绕的装置
EP3620561B1 (fr) * 2018-09-07 2021-05-05 ROJ S.r.l. Capteur optique de réflexion de fil de trame dans un alimenteur de trame de tissage
CN110258007B (zh) * 2019-05-21 2020-07-28 泉州精准机械有限公司 一种电子储纱器
JP7204624B2 (ja) * 2019-09-30 2023-01-16 株式会社島精機製作所 給電機構付き装置
CN113005632A (zh) 2019-12-19 2021-06-22 财团法人工业技术研究院 线材张力控制装置及应用其之编织机
TWI772991B (zh) 2020-12-02 2022-08-01 財團法人工業技術研究院 編織路徑生成方法與裝置以及動態修正方法與編織系統
CN114016200A (zh) * 2021-11-19 2022-02-08 宁波慈星股份有限公司 一种具有光电测纱功能的储纱器及测纱方法

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DE2743749C3 (de) * 1977-09-29 1984-10-11 SIPRA Patententwicklungs-und Beteiligungsgesellschaft mbH, 7000 Stuttgart Fadenspeicher- und -liefervorrichtung für Textilmaschinen
SE511091C2 (sv) * 1993-04-21 1999-08-02 Sipra Patent Beteiligung Garnmatare för textilmaskiner
KR19990008344A (ko) * 1995-05-08 1999-01-25 팝쉬츠하인리히 실 감는 드럼의 구동 유닛 회전 속도 제어 장치
DE19545891A1 (de) * 1995-12-08 1997-06-12 Memminger Iro Gmbh Verfahren zum Überwachen der Abtastverhältnisse beim Steuern einer Fadenliefervorrichtung
CN102851869A (zh) * 2011-06-28 2013-01-02 典洋针织机械股份有限公司 两用式送纱装置
ITMI20112046A1 (it) 2011-11-11 2013-05-12 Btsr Int Spa Dispositivo alimentatore di filo ad accumulo perfezionato
CN202595439U (zh) * 2012-06-08 2012-12-12 慈溪太阳洲纺织科技有限公司 一种储纱器

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CN104846533B (zh) 2019-03-08
CN104846533A (zh) 2015-08-19
EP2907908A1 (fr) 2015-08-19

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