EP0576909A1 - Métier à tisser avec un détecteur de trame - Google Patents

Métier à tisser avec un détecteur de trame Download PDF

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Publication number
EP0576909A1
EP0576909A1 EP93109583A EP93109583A EP0576909A1 EP 0576909 A1 EP0576909 A1 EP 0576909A1 EP 93109583 A EP93109583 A EP 93109583A EP 93109583 A EP93109583 A EP 93109583A EP 0576909 A1 EP0576909 A1 EP 0576909A1
Authority
EP
European Patent Office
Prior art keywords
light
guide channel
light receiver
slats
transmitter
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.)
Withdrawn
Application number
EP93109583A
Other languages
German (de)
English (en)
Inventor
Patrick Bouvyn
Frans Vandenabeele
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.)
Picanol NV
Barco NV
Original Assignee
Picanol NV
Barco NV
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 Picanol NV, Barco NV filed Critical Picanol NV
Publication of EP0576909A1 publication Critical patent/EP0576909A1/fr
Withdrawn legal-status Critical Current

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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
    • D03D47/30—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 gas jet
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/3073—Detection means therefor
    • 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

Definitions

  • the invention relates to a weaving machine with a reed consisting of a plurality of lamellae, which form a guide channel for a weft thread, and with an optical weft monitor, which contains a light transmitter and a light receiver receiving light rays reflected by a weft thread.
  • the light transmitter and the light receiver are arranged in the region of the open side of the essentially U-shaped guide channel. They are attached to the sley and, like auxiliary blowing nozzles, are needle-shaped so that they can penetrate into the shed with the movement of the sley.
  • the light rays are reflected not only by a weft thread, but also in particular by the end faces of the slats forming the guide channel.
  • the detection of an incoming weft thread is difficult since the amount of light received by the light receiver also depends on the contamination of the guide channel.
  • There is also the disadvantage that the presence of a weft thread that is only slightly reflective is difficult to ascertain.
  • optical weft monitors are also known (US Pat. No. 4,716,942, EP-A 137 380, EP-A 290 706), in which a light transmitter and a light receiver are arranged offset in height on the side facing away from the guide channel outside the slats.
  • light deflecting elements in the form of mirrors or prisms are arranged between the slats, which deflect the light beam from the light transmitter to the light receiver.
  • this type of construction has the disadvantage that the light guide means are arranged between the lamellae of the reed, which means that there is a risk that they will damage the reed.
  • this type of construction it is difficult to weave narrow or wide fabrics on the same weaving machine, since the light guide means then have to be reassembled. There is also the risk that these light guide means in air jet looms interfere with an air flow in the guide channel and lead to weaving errors.
  • the invention has for its object to provide a weft monitor for a weaving machine of the type mentioned, which responds essentially only to light rays reflected by weft threads and which does not require aids to be arranged between the lamellae of the reed.
  • This object is achieved in that the light transmitter and the light receiver are arranged on the side facing away from the guide channel outside the slats and in that the reception area of the light receiver is spatially limited to the light rays reflected from the guide channel by a weft thread.
  • the light rays of the light transmitter pass twice through the lamellae of the reed on the way to the light receiver, so that they act as a kind of shielding or filter, due to the disturbances due to reflections at the edges of the lamellae or from the side Elements, such as fabrics or warp threads, which are located outside the guide channel, are eliminated from the light rays reflected to the light receiver.
  • the weft monitor can be easily moved along the reed, so that it is possible to weave fabrics of different widths after changing articles.
  • the air flow in the guide channel is not influenced in air jet weaving machines.
  • the air jet weaving machine shown contains a weaving profile (1) which is mounted on legs (2) which are fastened on a weaving axis, not shown.
  • a weaving reed (3) is attached to the weaving profile (1) by means of a fastening (6).
  • the reed (3) consists of a plurality of lamellae (4), which together form a guide channel (5) for a weft thread (8).
  • lamellae (4) each have a U-shaped recess in the exemplary embodiment.
  • the weft thread (8) is inserted by means of a main blowing nozzle (not shown) and transported in the guide channel (5) in a known manner by means of auxiliary blowing nozzles (7), which are arranged in front of the open side of the guide channel (5).
  • the weft monitor (9) contains two light transmitters (10) which are arranged one above the other in a plane parallel to the surfaces of the slats (4) and one of which is directed obliquely from above and the other obliquely from below to the region of the guide channel (5) is.
  • a light receiver (11) is arranged in the same plane between the two light transmitters (10) and is oriented essentially perpendicular to the rear wall of the guide channel (5) and thus essentially parallel to the top and bottom of the guide channel (5).
  • the light beams (12) of the light transmitters are oriented in such a way that no surfaces or the like are found on the way to a weft thread (8) and within the guide channel (5) . are present, which reflect a light beam to the light receiver (11).
  • the light rays (13) reflected to the light receiver (11) thus clearly originate from the weft thread (8).
  • the light transmitters (10) and the light receiver (11) are arranged offset in height from one another in a common holder (14). Between the holder (14) and the slats (4) of the reed (3) an elastic intermediate element (16) is arranged, which is made of rubber, for example.
  • This intermediate element (16) serves to connect the holder (14) to the slats (4) without damaging them.
  • the intermediate element prevents a transmission of vibrations of the holder (14) of the weft monitor (9) to the slats.
  • the intermediate element (16) makes it possible to suppress vibrations of the lamellae (4).
  • the intermediate element (16) has an annular contour. It is divided by two crossbars (17) in such a way that three separate frames are created which surround the light transmitter (10) and the light receiver (11) (Fig. 3).
  • the holder (14) is provided with openings (20) through which air and dust or the like. can happen.
  • the walls (21) of the surrounds for the light transmitter (10) and the light receiver (11) are frustoconical.
  • the weft monitor (9) can thus clean itself automatically by means of the air flow which arises from the movement of the sley for the striking of the reed (3).
  • an additional blowing nozzle can also be provided for cleaning.
  • the light transmitters (10) emit a bundle of diverging light beams which have a certain opening angle, so that the entire guide channel (5) is illuminated.
  • 3 shows a limited number of the emitted light beams (12) and a reflected light beam (13).
  • the light transmitters (10) are controlled by means of a control unit (not shown) in such a way that they emit light beams (12) that have a wavelength that does not occur in ambient light.
  • the light receiver is switched by means of a control unit (not shown) in such a way that the light collected is eliminated, which does not reflect the light emitted by the light transmitters (10) Rays of light is. The influence of ambient light on the signal to be evaluated is thus eliminated.
  • the light transmitter (10) and the light receiver (11) with respect to the back (18) of the slats (4) of the reed (3) are arranged at an angle to each other such that light rays reflected from the back of the slats can hardly be picked up by the light receiver (11).
  • the transverse webs (17) of the elastic intermediate element (16) are provided between the light transmitters (10) and the light receiver (11).
  • a light transmitter (10) emits a diverging bundle of light beams, which has a defined opening angle. Due to the arrangement of the light transmitter in the vicinity of the rear sides (18) of the slats (4), light beams can only penetrate the gaps between a limited number of slats (4A to 4E). A part of these light rays, as shown for example with the light rays (12A and 12B), is reflected by a weft thread (8). The reflected light beams (13A and 13B) are received by the light receiver (11).
  • the light beam of the light transmitter (10) Due to the fact that the light beam of the light transmitter (10) has a defined, relatively large opening angle, reflections from elements that are far away from the light transmitter can hardly reach the light receiver (11). You do not get between the slats (4A to 4E) because these slats (4a to 4E) form a spatial filter.
  • the larger the opening angle of the light beam the smaller the distance at which an element can be perceived by the weft monitor (9) due to reflected light beams.
  • the opening angle is therefore expediently chosen so that only elements from the weft monitor (9) are perceived that are located within the guide channel (5).
  • This spatial filter effect makes it possible to largely eliminate interference signals, in particular lateral interference signals, so that essentially only the light rays reflected from a weft thread (8) located in the guide channel (5) can reach the light receiver (11).
  • the detection zone extends over a number of lamellae (4) of the reed (3). This has the advantage that an exact positioning of the weft monitor (9) to the slats (4) is not necessary.
  • the weft monitor (9) It is of course possible to equip the weft monitor (9) with only one light transmitter (10) and one light receiver (11) or two light receivers (11) and one light transmitter (10).
  • the use of two light transmitters (10) and one light receiver (11) makes it possible to increase the amplitude of the signals picked up, which benefits the sensitivity of the shot guard (9).
  • the point in the guide channel (5) where the weft thread (8) is located is of less importance for the value of the signal received by the light receiver (11), so that the sensitivity of the weft monitor (9) for the guide channel (5) is largely uniform.
  • the weft monitor (9) is not attached to the weaving profile (1), but for example by means of a clamp or a clip or the like. on the upper profile (23) of the reed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP93109583A 1992-07-03 1993-06-16 Métier à tisser avec un détecteur de trame Withdrawn EP0576909A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9200620 1992-07-03
BE9200620A BE1006073A3 (nl) 1992-07-03 1992-07-03 Inslagwachter voor weefmachines.

Publications (1)

Publication Number Publication Date
EP0576909A1 true EP0576909A1 (fr) 1994-01-05

Family

ID=3886351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93109583A Withdrawn EP0576909A1 (fr) 1992-07-03 1993-06-16 Métier à tisser avec un détecteur de trame

Country Status (4)

Country Link
US (1) US5329961A (fr)
EP (1) EP0576909A1 (fr)
JP (1) JPH06257037A (fr)
BE (1) BE1006073A3 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE469597B (sv) * 1991-09-23 1993-08-02 Rydborn S A O Anordning foer oevervakning av inslaget i vaevstol, innefattande riktade ljuskaensliga element
SE469448B (sv) * 1991-09-27 1993-07-05 Rydborn S A O Optisk oevervakningsanordning foer att detektera om en traad aer i roerelse
BE1010779A3 (nl) * 1996-12-02 1999-01-05 Picanol N V Naamloze Vennoosch Inslagwachter voor een weefmachine.
JP4590058B2 (ja) * 2000-04-12 2010-12-01 株式会社ディスコ 切削装置の切削ブレード検出機構
JP4410048B2 (ja) * 2004-02-19 2010-02-03 株式会社豊田中央研究所 ジェットルームにおける緯糸張力付与装置
JP5999136B2 (ja) * 2014-05-13 2016-09-28 株式会社豊田自動織機 エアジェットルームにおける緯糸検出装置
BE1025511B1 (nl) 2017-08-31 2019-04-03 Picanol N.V. Sensor systeem voor een weefmachine
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
FR3094991B1 (fr) * 2019-04-10 2021-05-14 Faurecia Automotive Ind Peigne de fabrication comportant un élément élastique comprimé par des dents longitudinales entre une cale supérieure et une cale inférieure, et procédé d’assemblage associé

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2184356A5 (fr) * 1972-05-10 1973-12-21 Rueti Te Strake Bv
EP0137380A2 (fr) * 1983-10-10 1985-04-17 ROJ ELECTROTEX S.p.A. Détecteur optique de fil de trame pour métiers à jet d'air
US4716942A (en) * 1985-08-26 1988-01-05 Picanol N.V. Optical weft stop motion for looms with a U-shaped reed
US4738284A (en) * 1985-04-05 1988-04-19 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method and an apparatus for detecting the weft yarn in a jet loom
EP0290706A1 (fr) * 1987-05-14 1988-11-17 Istituto Nazionale Di Ottica Dispositif de contrôle du fil de trame dans les métiers à tisser à jet d'air

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295499A (en) * 1978-12-12 1981-10-20 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Detection of weft in shuttleless loom
CH659672A5 (de) * 1982-11-11 1987-02-13 Loepfe Ag Geb Schussfadenwaechter.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2184356A5 (fr) * 1972-05-10 1973-12-21 Rueti Te Strake Bv
EP0137380A2 (fr) * 1983-10-10 1985-04-17 ROJ ELECTROTEX S.p.A. Détecteur optique de fil de trame pour métiers à jet d'air
US4738284A (en) * 1985-04-05 1988-04-19 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Method and an apparatus for detecting the weft yarn in a jet loom
US4716942A (en) * 1985-08-26 1988-01-05 Picanol N.V. Optical weft stop motion for looms with a U-shaped reed
EP0290706A1 (fr) * 1987-05-14 1988-11-17 Istituto Nazionale Di Ottica Dispositif de contrôle du fil de trame dans les métiers à tisser à jet d'air

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
TEXTIL PRAXIS INTERNATIONAL Bd. 35, Nr. 2, Februar 1980, LEINFELDEN DE Seiten 147 - 159 ING. A. STILLHART 'Eine neue Generation von optischen Schussf}hlern' *

Also Published As

Publication number Publication date
US5329961A (en) 1994-07-19
BE1006073A3 (nl) 1994-05-03
JPH06257037A (ja) 1994-09-13

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