EP0411181A1 - Weft yarn detector, particularly for jet looms - Google Patents

Weft yarn detector, particularly for jet looms Download PDF

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Publication number
EP0411181A1
EP0411181A1 EP89114265A EP89114265A EP0411181A1 EP 0411181 A1 EP0411181 A1 EP 0411181A1 EP 89114265 A EP89114265 A EP 89114265A EP 89114265 A EP89114265 A EP 89114265A EP 0411181 A1 EP0411181 A1 EP 0411181A1
Authority
EP
European Patent Office
Prior art keywords
pick
beat
reed
weft thread
dents
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Withdrawn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
EP89114265A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jozef Drha
Ján Misani
Jarolim Dipl.-Ing. Klco
Stanislav Kucerak
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.)
ZVS ZAVODY VSEOBECNEHO STROJARSTVA KONCERNOVY PODNIK
Original Assignee
ZVS ZAVODY VSEOBECNEHO STROJARSTVA KONCERNOVY PODNIK
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 ZVS ZAVODY VSEOBECNEHO STROJARSTVA KONCERNOVY PODNIK filed Critical ZVS ZAVODY VSEOBECNEHO STROJARSTVA KONCERNOVY PODNIK
Publication of EP0411181A1 publication Critical patent/EP0411181A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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 pick-up device of a weft thread at its final stage of passage in the shed of the loom, particularly for jet looms with introduction of the weft by a stream of a carrier medium by way of a feeding channel created by shaped parts of dents of the beat-up reed, com­prising coaxially arranged mouths of a transmitter and re­ceiver of electromagnetic heat provided between dents of the beat-up reed, whereby the optical axis of said transmitter and receiver is oriented transversely to the track of the introduced weft thread and parallel to beating-up parts of adjacent shaped dents of the beat-up reed.
  • opto­electronic pick-up devices operate on the principle of re­flection of transmitted electromagnetic heat from the weft thread and are utilizing optics. They are situated on the slay of the loom and partly influence the track of the air medium causing a turbulence of air and thus possibly also that fine weft materials do not reach their destination.
  • An optoelectronic pick-up device is also known with pick-up elements situated mutually opposite, composed of two pieces requiring a difficult mounting to the loom and problems with fixing a couple of connecting cables.
  • a further known opto­electronic pick-up device has the same shape as dents of the beat-up reed, is of course substantially wider than the gap between individual dents, and light conductors are used for supply of electromagnetic heat to the detection place.
  • the heat source and the receiver are situated on the upper and lower support of dents of the reed. This pick-up device does not allow any change of the weaving width without adjustment of the length of the reed, or without its exchange.
  • a common drawback of known pick-up devices of weft threads is mainly their unfavourable position causing a rather unre­liable introduction of the weft, particularly in the dusty medium of weaving mills and in case of weaving dusty fabrics.
  • Another drawback is that they are highly demanding in manu­facture, technology and assembling.
  • a drawback is also the already mentioned requirement of a wearisome adjustment of the beat-up reed in case of a change of the width of the fabric.
  • a pick-up device of a weft thread particularly for jet looms, where the weft thread is introduced by way of an introductory channel by a stream of a carrier medium, said channel being composed of shaped dents of a beat-up reed and comprising also coaxially arranged mouths of a transmitter and a receiver of electromagnetic heat provided between dents of the beat-up reed, whereby their optical axis is oriented transversely to the track of the weft thread and in parallel to beating-up parts of adjacent dents of the beat­up reed, characterized in that the optical axis of the mouth of the transmitter and the receiver of electromagnetic heat is, from the plane passing through beat-up parts of adjacent dents of the beat-up reed, at a distance of at most twenty times the recountable diameter of the introduced weft thread.
  • the transmitter and the receiver of electromagnetic heat are arranged on a pick-up part of a body of the pick-up device in a flat shape situated between dents of the beat-up reed provided with a recess, the shape of which corresponds to the introductory profile of shaped dents of said reed, into which recess the transmitter and the receiver of electromagnetic heat are terminating, where­by a supporting part of the body of the pick-up device is fixed on the slay of the loom.
  • the pick-up part is disassemblably connected to said supporting part.
  • the main advantage of the pick-up device of the weft thread according to this invention is its suitable arrangement securing a reliable picking-up of the weft thread at the final stage of its introduction into the shed even in a dusty surrounding of weaving mills and in the course of weaving dusty fabrics. Another advantage is the reduction of manufacturing, operational and assembling requirements.
  • the pick-up device can be mounted on the loom according to the width of the fabric without any adjustment or replacement of the beat-up reed.
  • the slay 5 of a loom not shown in detail in Fig. 1 performs a reciprocating swinging movement from an introductory position indicated in Fig. 1 by full lines in direction 9 to a beat-up position indicated in Fig. 1 by dashed lines.
  • the beat-up reed 4 is supported in a slot 16 of the slay 5, the shaped dents of the reed having recesses 8 forming in a system of dents 7 an introductory channel for introduction of the weft thread 6 in the open shed of the loom created by the upper and lower system of warp threads 21 and 22 by an air stream from a main nozzle not shown and from additional nozzles 10 situated along the slay 5 and arranged adjustable in a groove 20.
  • the pick-up device of the weft thread 6 at its final stage of introduction includes a coaxially arranged mouth of a transmitter 2 and of a receiver 3 of electro­ magnetic heat, for instance within the infrared range which are situated between dents 7 of the beat-up reed 4 whereby the optical axis 14 thereof is parallel to the beat-up parts 15 of adjacent shaped dents 7 of the beat-up reed 4. It is important for functional reasons of the introduced weft thread that the optical axis 14 of the mouth of the trans­mitter 2 and of the receiver 3 of electromagnetic heat is, from a plane passing through beat-up parts 15 of adjacent dents 7 of the reed 4 at a distance of at most twenty counted over diameters of the introduced weft thread 6.
  • the transmitter 2 and the receiver 3 of electromagnetic heat are advantageously arranged in the pick-up part 11 of the body 1 of the pick-up device.
  • the pick-up part 11 is of flat shape and is situated between dents 7 of the beat-up reed 4. It is provided with a recess 13, the shape of which corresponds to the beat-up profile of shaped dents 7 of the reed 4, parti­cularly with its recesses 8.
  • the transmitter 2 and the receiver 3 of electromagnetic heat are terminating into the recess 13 whereby the supporting part 19 of the body 1 of the pick-up device is fixed on the slay 5 of the loom.
  • This fixing of the body 1 of the pick-up device enables, in the course of weaving, a partial mutual movement of the pick-up part 11 and of adjacent shaped dents 7, causing thereby that the settling of textile dust is prevented, which dust is blown away by the air stream. It is advantageous from the point of view of manufacture and assembling if the pick-up part 11 is connected disassemblably to the supporting part 19 of the body 1 of the pick-up device, for instance by means of screws with countersunk heads not shown.
  • the supporting part 19 of the body 1 of the pick-up device is provided with a guiding extension 23 for introduction in a slot 20 for auxiliary nozzles 10.
  • the pick-up part 11 of the body 1 of the pick-up device is inserted between shaped dents 7 of the beat-up reed 4 from the front side, representing an alternative to preceding embodiments.
  • Each supporting part 19 of the body 1 of the pick-up device has an opening 17 for fixing a connector not shown for connection of the pick-up device to electrical evaluation circuits of the loom not shown.
  • the slay 5 moves in the course of weaving rhythmically from the introductory to the beat-up position and vice versa at each revolution of the loom.
  • the weft thread 6 is introduced at the introductory position into the introduction channel.
  • the intensity of electromagnetic heating is changed, creating an electrical impulse which after processing by electronics of the pick-up device and of evaluation circuits of the loom enables a subsequent operation of the loom.
  • the evaluation circuits stop the loom for absence of the weft thread 6, that is, the weft thread has not finished its supposed course.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP89114265A 1987-12-07 1989-08-02 Weft yarn detector, particularly for jet looms Withdrawn EP0411181A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CS228487A CS272964B1 (en) 1987-12-07 1987-12-07 Pickup of weft threadrange especially for jet weaving looms

Publications (1)

Publication Number Publication Date
EP0411181A1 true EP0411181A1 (en) 1991-02-06

Family

ID=5359515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114265A Withdrawn EP0411181A1 (en) 1987-12-07 1989-08-02 Weft yarn detector, particularly for jet looms

Country Status (2)

Country Link
EP (1) EP0411181A1 (cs)
CS (1) CS272964B1 (cs)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114790602B (zh) * 2022-04-25 2025-08-26 青岛天一红旗纺机集团有限公司 一种喷气织机引纬性能检测装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2184356A5 (cs) * 1972-05-10 1973-12-21 Rueti Te Strake Bv
EP0036314A1 (en) * 1980-03-15 1981-09-23 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Weft yarn detector
FR2494731A1 (fr) * 1980-11-25 1982-05-28 Rueti Ag Maschf Dispositif de surveillance du fil de trame dans les metiers a tisser a tuyeres
EP0137380A2 (en) * 1983-10-10 1985-04-17 ROJ ELECTROTEX S.p.A. Optical weft sensor for air jet weaving looms

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2184356A5 (cs) * 1972-05-10 1973-12-21 Rueti Te Strake Bv
EP0036314A1 (en) * 1980-03-15 1981-09-23 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Weft yarn detector
FR2494731A1 (fr) * 1980-11-25 1982-05-28 Rueti Ag Maschf Dispositif de surveillance du fil de trame dans les metiers a tisser a tuyeres
EP0137380A2 (en) * 1983-10-10 1985-04-17 ROJ ELECTROTEX S.p.A. Optical weft sensor for air jet weaving looms

Also Published As

Publication number Publication date
CS272964B1 (en) 1991-02-12
CS228487A1 (en) 1990-07-12

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