WO2000048934A1 - Detecteur de fil optoelectronique ou detecteur optoelectronique - Google Patents

Detecteur de fil optoelectronique ou detecteur optoelectronique Download PDF

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Publication number
WO2000048934A1
WO2000048934A1 PCT/EP2000/001360 EP0001360W WO0048934A1 WO 2000048934 A1 WO2000048934 A1 WO 2000048934A1 EP 0001360 W EP0001360 W EP 0001360W WO 0048934 A1 WO0048934 A1 WO 0048934A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
receiver
thread
surface structure
reflection
Prior art date
Application number
PCT/EP2000/001360
Other languages
German (de)
English (en)
Inventor
Jerker Hellström
Lars Helge Gottfrid Tholander
Original Assignee
Iro Patent Ag
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Iro Patent Ag filed Critical Iro Patent Ag
Priority to EP00907583A priority Critical patent/EP1152970A1/fr
Publication of WO2000048934A1 publication Critical patent/WO2000048934A1/fr

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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/367—Monitoring yarn quantity on the drum
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V8/00—Prospecting or detecting by optical means
    • G01V8/10—Detecting, e.g. by using light barriers
    • G01V8/12—Detecting, e.g. by using light barriers using one transmitter and one receiver
    • G01V8/14—Detecting, e.g. by using light barriers using one transmitter and one receiver using reflectors

Definitions

  • the invention relates to an optoelectronic thread sensor according to the preamble of claim 1 and an optoelectronic sensor according to the preamble of claim 10
  • Optoelectronic thread sensors are used in thread processing, in particular on or in thread delivery devices, for example for detecting the presence or absence of the thread or the movement of the thread through a detection area, for measuring the speed of the movement of the thread through a passage area, for detecting a thread break or If the light source illuminates a reflection area, the light there forms an approximately round light spot.
  • the receiver responds to the shadow of the light spot or the reflection of the light from the thread and generates a useful signal.
  • An important parameter for the goodness of the useful signal is the so-called Modulation, i.e.
  • EP-A-0 460 699 discloses a thread sensor with a light barrier, which emanates from a laser light source mounted on one part and is directed at a receiver mounted in another part of the thread device, which affects misalignments due to manufacturing tolerances or assembly deviations and inevitable relative movements between the parts the reliability of the thread sensor, although a high modulation would actually be expected with the bundled and concentrated laser light and a small light spot. For this reason, laser light sources have so far not been used for thread sensors working with a reflection area
  • the object of the invention is to increase the scanning accuracy in a thread sensor of the type mentioned at the outset, ie to achieve the highest possible modulation, and to improve the reliability under influences which are caused by manufacturing, operating and assembly-related malpositions and / or based on relative movements between the light source or the receiver and the reflection area
  • Laser light creates an exact, sharply defined and high-contrast light spot on the reflection area, which leads to very strong modulation at the receiver and thus to strong useful signals when the thread passes through, so that without Notable additional electrical expenditure not only allows the presence or absence or the passage of the thread to be detected very precisely, but even the speed of passage can be determined with high accuracy.
  • the retroreflective surface structure has the peculiarity of returning incident light rays to the light source with high power regardless of the direction of impact
  • the reflection light is available at the location determined by the position of the laser light source, from which it can be directed to the receiver, which may be positioned on the same part.
  • an optimally small-sized light spot on the surface structure is spread during reflection by the overlapping reflection behavior of the convexly curved surface structure in the direction of the curvature, i.e. the reflection light reflected to the light source forms a spread ellipse from a small light spot or an elongated light bar from which the receiver generates precise and strong useful signals due to the high light density in the transverse direction with high modulation.
  • the reflection light has a very high light density.
  • the retroreflection prevents the interference factors mentioned
  • a VCEL or a surface emitting laser diode (SELD) as a laser light source is inexpensive, easy to install and requires only a small additional electronic effort
  • Forming the retroreflective surface structure from prisms or cooperating reflectors leads, depending on the requirements, to high reflection non-yield and the desired strong modulation during thread passage
  • the receiver should be positioned close to the laser light source, whereby the orientation of the laser light source can be adapted to the structural conditions in the area of the thread sensor and not due to the need for the smallest possible distance or one Direction of impact as vertical as possible
  • the receiver can be positioned at any point. Since the reflection light is reflected exactly in the direction of the laser light source and must be deflected from this direction to the receiver, the deflection device for the laser light must be transparent
  • a mirror which is broken through for the concentrated and thin laser light beam, the mirror surface of which reflects the reflection light to the receiver.
  • a semi-permeable mirror can be used, which penetrates the laser light, but on the other hand the reflection light is deflected
  • the light source can be a laser diode, preferably a VCEL or surface emitting laser diode (VCEL vertical cavity emitting laser)
  • the concentrated and bright light spot on the semiretroreflective surface structure is spread in one dimension when reflecting due to the normal reflection behavior of this surface structure.
  • the spread dimension should expediently coincide approximately with the longitudinal axis of the thread, which extends across its longitudinal axis through the passage area of the sensor.
  • a light-emitting diode could also be used as the light source, which is able to form the small, bright light spot on the semiretroreflective surface structure
  • the spreading curvature is expediently at least largely identical to the surface curvature of the storage body, and the direction of the spreading curvature is oriented in the circumferential direction of the storage body, which inevitably and inevitably causes torsional vibrations of the storage body the axis of the memory body can occur thanks to the curvature, do not produce any rotational displacements of the reflected light spot
  • 1 is a schematic side view of a thread delivery device with at least one optoelectronic thread sensor
  • FIG. 2 shows an enlarged section of an axial section of the thread delivery device from FIG. 1 with a first embodiment of a thread sensor
  • FIG. 5 shows a schematic perspective illustration of the operation of, for example, the thread sensor from FIG. 2,
  • FIG. 7 shows a perspective illustration of a detail of a further embodiment, in particular for an optoelectronic sensor
  • FIG. 8 schematically shows a frontal view of a thread delivery device with the sensor from FIG. 7,
  • FIG. 9 is a side view of FIG. 8, and
  • a yarn delivery device F in FIG. 1 for example a weaving machine weft delivery device, has a housing 1 with an electric drive motor 2 and a drum-shaped storage body 3, which is rotatably mounted on a drive shaft (not shown), but by means of cooperating magnets 3 'but rotating with it Drive shaft is prevented
  • a winding element 4 is driven by the drive shaft, which temporarily stores a thread Y inserted into the thread delivery device F from the left in adjacent windings on the storage body 3.
  • the housing 1 has a housing extension 5, in which two optoelectronic thread sensors S are arranged in the embodiment shown, which are aligned with reflection areas M on the storage body 3.
  • the sensors S are connected to a control unit C of the thread delivery device, which controls the drive motor 2 carries out
  • Each thread sensor S has at least one light source E and a receiver R.
  • the light source E directs a light beam onto the reflection area M, the receiver R is subjected to reflection light.
  • the light beam generates a light spot on the reflection area, which is shaded when the thread passes.
  • the receiver speaks the shading or the release of the light spot and generates an output signal
  • the sensor S on the left in FIG. 1 is used, for example, to monitor the position of the front limit of the thread supply on the storage body 3.
  • the sensor on the right in FIG. 1 monitors the removal of the thread by generating a signal with each thread pass. These signals are used to either pull off Number of windings is paid or the speed of the thread is determined during take-off.
  • a further sensor not shown, could be arranged at the exit area of the thread from the take-up element 4 in order to detect a thread break.
  • a sensor could also be provided in the area of the take-off can 6 Thread delivery devices Such optoelectronic thread sensors are also used in thread delivery devices for knitting machines in which the storage body can be driven in rotation, if necessary
  • a laser light source L for example a VCEL or surface-emitting laser diode, and a retroreflective surface structure A are provided in each sensor S as light source E, and a retroreflective surface structure A is provided in the reflection region M.
  • the laser light source (FIGS. 2 to 4) is used to produce a precisely dimensioned, approximately cylindrical and thin light beam 7, which produces a very small, bright and high-contrast light spot 8 on the surface structure A.
  • the peculiarity of the retroreflective surface structure A is that it reflects incident light essentially in the incident direction, ie essentially back to the laser light source L, with a small amount Loss and little scattering If the thread Y moves in or through the light spot, strong modulation occurs at the receiver R, which leads to a powerful useful signal.
  • the modulation achievable with the laser light source and the retroreflective surface structure A is approximately 40% or even higher
  • the receiver R and the light source E ie the laser light source L
  • a printed circuit board 12 for example in surface mounting technology (SMD).
  • the receiver R and the laser light source L are expediently diodes. These diodes are accommodated in a common housing 11. which is located at a distance from the surface of the storage body 3 and has a light passage 13.
  • the direction of the light beam 7 from the laser light source can be chosen freely, since the retroreflective surface structure A always reflects the light in the opposite direction to the direction of incidence slightly larger image of the light spot 8 on the receiver R
  • the retroreflective surface structure A can be arranged on the surface of the storage body 3, or set slightly lower in a recess 10. For example, it has a large number of prisms or a large number of reflectors arranged at certain angles relative to one another.
  • the retroreflective surface structure is made of a transparent plastic or integrated glass plate or arranged on a plastic film that is attached to or in the storage body 3, the laser light source L in the housing 11 of the thread sensor S is aligned directly with the retroreflective surface structure A of the reflection area M.
  • a reflection light deflection device D is provided, for example a mirror 14 with an opening 15 for the laser light 7, the mirror surface being inclined at an angle to the reflection light 9 as indicated at 9 ', on the side and below throw receiver R offset approximately 90 ° with respect to light source E. Shields 16 prevent mutual interference.
  • the light source E or laser light source L and the receiver R are mounted on a common printed circuit board 12 which is oriented approximately vertically or relatively upright in relation to the retroreflective surface structure A.
  • the direction of light emission and the direction of reception are approximately parallel to one another.
  • the laser light source L is spaced from the receiver R.
  • the light beam 7 is deflected in a housing 11 on a deflecting mirror 19 by approximately 90 ° and directed as a deflected light beam 7 'onto the retroreflective surface structure A.
  • a deflection mirror 14 equipped with an aperture 15 directs the reflection light 9 onto the receiver R, as indicated at 9 ′.
  • the laser light source L and the receiver R are expediently positioned in channels 17, 18 that avoid mutual interference.
  • FIG. 5 schematically illustrates how the laser light source L throws the light beam 7 onto the retroreflective surface structure A, which is, for example, plate-shaped, and generates the small, approximately circular light spot 8 there.
  • the diameter of the light spot can be approximately 1.0 mm or be somewhat smaller or somewhat larger.
  • the reflection light 9 forms the light spot 8 on the receiver R arranged next to the laser light source L. If the thread shown in FIG. 5 moves transversely to its longitudinal axis over the light spot 8, the light spot 8 is disturbed, changed or shadowed, to which the receiver R responds with a signal. Thanks to the small size and the high light density of the light spot 8, a strong modulation occurs.
  • the reflection area M is shown large, and can actually be much smaller and of a different shape.
  • a relatively large reflection area Rich M of the retroreflective surface structure A offers the advantage of being able to arrange the laser light source L and the receiver R as desired, or, if appropriate, of letting two or more laser light sources use the same retroreflective surface structure A for a plurality of sensors working in an adjacent manner
  • the laser light source L serving as the light source is oriented approximately vertically onto the retroreflective surface structure A in order to generate the light triangle 8 there. Since the receiver R is arranged offset by approximately 90 ° to the laser light source L, reflection is avoided -Umlenkvor ⁇ chtung D a semipermeable mirror 23 is provided, which is transparent in the direction of arrow 24 for the light beam 7, in the direction of arrows 25, however, acts as a full mirror and throws the reflection light 9 on the receiver R. Such a semipermeable mirror 13 could also be used in the 3 and 4 are used
  • An optoelectronic sensor S is indicated in FIG. 7, in which the light source E is a laser diode L or a conventional LED, which generates a highly concentrated light beam and thus a small light spot 8.
  • the reflection area M in this sensor S is a semiretroreflective surface structure A ', which - facing the light source E - has a convex spreading curvature K. It is, for example, a transparent plastic plate 20, on the underside 21 of which the semiretroreflective surface structure A 'is provided.
  • the surface structure A' is retroreflective in the plane caused by the longitudinal direction X and A straight line defined by the light beam 7 is formed, ie expediently in all radial planes which contain the axis of the expansion curvature K.
  • the plate 20 can be a section of a cylinder jacket.
  • the surface structure reflects in all planes which are oriented parallel to the direction Z.
  • a 'normal, ie incident light is reflected in accordance with the angle of incidence. This ensures that the light spot 8 is reflected by the retroreflection in the opposite direction to the light beam 7, but at the same time is brought about by the spreading curvature K from an approximately round shape into an elliptical shape or into the shape of a light bar, its longitudinal extension is parallel to the Z direction
  • a semipermeable mirror 23 in the light beam 7, for example, which is transparent to the light beam 7, reflects the spread light spot G onto the receiver R Specifically, such a semiretroreflective surface structure A 'can be formed, for example, in an approximately 3 mm thick, curved plastic plate by parallel grooves with an opening angle of 90 ° and a flank angle with respect to the vertical of 45 ° are formed on the underside in the direction of Z, and their flanks are reflective, e.g
  • the spread light spot E has a high light density in the direction of its narrow dimension has a high modulation, which is particularly high if a laser light source L is used.
  • a laser light source L can be used which are capable of producing a highly concentrated light beam 7, for example with the help an additional aperture or lens system (not shown)
  • the sensor S from FIG. 7 can expediently be used in a thread delivery device, as shown in FIGS. 8 and 9, the semiretroreflective surface structure A 'having the same spreading curvature K as the curvature of the surface of the storage body 3, thereby losing torsional vibrations (arrow 22 in FIG 8) of the storage body 3 about its axis their influence on a proper reflection to the receiver R in a yarn delivery device with a stationary storage body 3, namely, torsional vibrations occur during operation, which impair the scanning result when the reflected light participates in the torsional vibrations through the axis of the storage body 3 as the spreading curvature K having the curvature axis and the semiretroreflective property of the surface structure A ', the reflection light 9 ′′ hits the receiver R correctly despite torsional vibrations
  • the light beam 7 is directed obliquely onto the surface structure A ′ in the radial plane of FIG. 8, in which the light source E and the axis of the storage drum 3 are located.
  • the reflection light 9 ′′ is directed onto the deflecting mirror 14 formed here with the opening 15 thrown and reflected by this at 9 '"on the receiver R, thanks to the spreading curvature K, the longitudinal direction of the spread light spot G approximately coincides with the longitudinal axis of the thread Y, so that this causes a strong modulation at the receiver R when passing through the light spot 8 10, the light spot 8 is deformed with its diameter d1 from the reflection light to the spread light spot G, the narrower dimension d2 of which is only slightly larger than d1, while its spread dimension d3 is considerably larger than d1.
  • the surface structure A can be flat or curved

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

L'invention concerne un détecteur de fil (S) optoélectronique faisant partie d'un appareil de livraison de fil, qui comporte un zone de réflexion (M) placée sur une partie dudit appareil de livraison de fil et une source de lumière (L) ou un récepteur (R) placé sur une autre partie dudit appareil de livraison de fil. Entre la zone de réflexion et la source de lumière se trouve une zone de passage de fil. La source de lumière (L) est une source de lumière laser. La zone de réflexion comporte une structure superficielle (A) rétroréfléchissante. Pour qu'il soit possible d'obtenir, d'une autre façon, une modulation élevée de l'atténuation du point lumineux formé par la source de lumière, la zone de réflexion (M) pourrait présenter, dans une variante, une structure superficielle semi-rétroréfléchissante avec une courbe d'étalement.
PCT/EP2000/001360 1999-02-19 2000-02-18 Detecteur de fil optoelectronique ou detecteur optoelectronique WO2000048934A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP00907583A EP1152970A1 (fr) 1999-02-19 2000-02-18 Detecteur de fil optoelectronique ou detecteur optoelectronique

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9900610-8 1999-02-19
SE9900610A SE9900610D0 (sv) 1999-02-19 1999-02-19 Optoelektronischer Fadensensor

Publications (1)

Publication Number Publication Date
WO2000048934A1 true WO2000048934A1 (fr) 2000-08-24

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SE (1) SE9900610D0 (fr)
WO (1) WO2000048934A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002052081A2 (fr) * 2000-12-22 2002-07-04 L.G.L. Electronics S.P.A. Dispositif d'acheminement d'une trame amelioree, notamment pour les metiers a jet fluide
WO2009124592A1 (fr) * 2008-04-10 2009-10-15 Memminger-Iro Gmbh Détecteur de fil optique insensible à la lumière ambiante
EP2237076A1 (fr) 2008-12-09 2010-10-06 Sick Ag Barrière lumineuse
CN102139820A (zh) * 2010-02-02 2011-08-03 村田机械株式会社 纱线卷绕机
EP2993260A1 (fr) * 2014-09-05 2016-03-09 L.G.L. Electronics S.p.A. Dispositif d'alimentation de fil avec tambour rotatif de stockage et capteur de déroulement du fil

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110736424B (zh) * 2018-07-19 2021-06-18 宁波舜宇光电信息有限公司 结构光投射模组组测设备的标定方法及投射模组组测方法

Citations (10)

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Publication number Priority date Publication date Assignee Title
DE1937503A1 (de) * 1969-07-23 1971-02-04 Siemens Ag Fotoelektrisches Bauelement
US4325520A (en) * 1978-01-31 1982-04-20 Sulzer Brothers Limited Apparatus for storing filamentary material
US4484070A (en) * 1981-04-30 1984-11-20 Canon Kabushiki Kaisha Sheet detecting device
EP0130337A2 (fr) * 1983-06-30 1985-01-09 International Business Machines Corporation Dispositif pour mesure optique
EP0327973A1 (fr) * 1988-02-11 1989-08-16 ROJ ELECTROTEX S.p.A. Dispositif d'alimentation en fil
EP0460699A1 (fr) * 1988-12-07 1991-12-11 Iro Ab Dispositif d'emmagasinage et d'amenée de fil
US5369284A (en) * 1993-03-30 1994-11-29 The Charles Stark Draper Laboratory, Inc. Active edge position measuring device
WO1997037247A1 (fr) * 1996-04-01 1997-10-09 Iro Ab Dispositif optoelectronique
DE19627083A1 (de) * 1996-07-05 1998-01-08 Leuze Electronic Gmbh & Co Reflexionslichtschranke
EP0873961A2 (fr) * 1997-04-24 1998-10-28 L.G.L. Electronics S.p.A. Détecteur optique pour surveiller la réserve de fil dans les fournisseurs de trame et fournisseur équipé d'un tel détecteur

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1937503A1 (de) * 1969-07-23 1971-02-04 Siemens Ag Fotoelektrisches Bauelement
US4325520A (en) * 1978-01-31 1982-04-20 Sulzer Brothers Limited Apparatus for storing filamentary material
US4484070A (en) * 1981-04-30 1984-11-20 Canon Kabushiki Kaisha Sheet detecting device
EP0130337A2 (fr) * 1983-06-30 1985-01-09 International Business Machines Corporation Dispositif pour mesure optique
EP0327973A1 (fr) * 1988-02-11 1989-08-16 ROJ ELECTROTEX S.p.A. Dispositif d'alimentation en fil
EP0460699A1 (fr) * 1988-12-07 1991-12-11 Iro Ab Dispositif d'emmagasinage et d'amenée de fil
US5369284A (en) * 1993-03-30 1994-11-29 The Charles Stark Draper Laboratory, Inc. Active edge position measuring device
WO1997037247A1 (fr) * 1996-04-01 1997-10-09 Iro Ab Dispositif optoelectronique
DE19627083A1 (de) * 1996-07-05 1998-01-08 Leuze Electronic Gmbh & Co Reflexionslichtschranke
EP0873961A2 (fr) * 1997-04-24 1998-10-28 L.G.L. Electronics S.p.A. Détecteur optique pour surveiller la réserve de fil dans les fournisseurs de trame et fournisseur équipé d'un tel détecteur

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002052081A2 (fr) * 2000-12-22 2002-07-04 L.G.L. Electronics S.P.A. Dispositif d'acheminement d'une trame amelioree, notamment pour les metiers a jet fluide
WO2002052081A3 (fr) * 2000-12-22 2003-08-28 Lgl Electronics Spa Dispositif d'acheminement d'une trame amelioree, notamment pour les metiers a jet fluide
WO2009124592A1 (fr) * 2008-04-10 2009-10-15 Memminger-Iro Gmbh Détecteur de fil optique insensible à la lumière ambiante
EP2237076A1 (fr) 2008-12-09 2010-10-06 Sick Ag Barrière lumineuse
US8248619B2 (en) 2008-12-09 2012-08-21 Sick Ag Light barrier
CN102139820A (zh) * 2010-02-02 2011-08-03 村田机械株式会社 纱线卷绕机
EP2354069A3 (fr) * 2010-02-02 2012-08-01 Murata Machinery, Ltd. Machine de renvideur de fil
EP2993260A1 (fr) * 2014-09-05 2016-03-09 L.G.L. Electronics S.p.A. Dispositif d'alimentation de fil avec tambour rotatif de stockage et capteur de déroulement du fil
US9738484B2 (en) 2014-09-05 2017-08-22 L.G.L. Electronics S.P.A. Yarn feeder with rotary storage drum and yarn-unwinding sensor

Also Published As

Publication number Publication date
EP1152970A1 (fr) 2001-11-14
SE9900610D0 (sv) 1999-02-19

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