EP0624674A1 - Vorrichtung zur optischen Detektion eines Schussfadens und diese Vorrichtung umfassender Schussfadenspeicher - Google Patents

Vorrichtung zur optischen Detektion eines Schussfadens und diese Vorrichtung umfassender Schussfadenspeicher Download PDF

Info

Publication number
EP0624674A1
EP0624674A1 EP94107218A EP94107218A EP0624674A1 EP 0624674 A1 EP0624674 A1 EP 0624674A1 EP 94107218 A EP94107218 A EP 94107218A EP 94107218 A EP94107218 A EP 94107218A EP 0624674 A1 EP0624674 A1 EP 0624674A1
Authority
EP
European Patent Office
Prior art keywords
rays
weft
transparent plate
plate
angle
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.)
Granted
Application number
EP94107218A
Other languages
English (en)
French (fr)
Other versions
EP0624674B1 (de
Inventor
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
Original Assignee
LGL Electronics SpA
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 LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP0624674A1 publication Critical patent/EP0624674A1/de
Application granted granted Critical
Publication of EP0624674B1 publication Critical patent/EP0624674B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H63/00—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package
    • B65H63/02—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material
    • B65H63/024—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials
    • B65H63/028—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element
    • B65H63/032—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic
    • B65H63/0321—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators
    • B65H63/0324—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to reduction in material tension, failure of supply, or breakage, of material responsive to breakage of materials characterised by the detecting or sensing element electrical or pneumatic using electronic actuators using photo-electric sensing means, i.e. the defect signal is a variation of light energy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/31—Textiles threads or artificial strands of filaments

Definitions

  • the present invention relates to a weft detecting optical device, particularly for detecting the presence of a reserve of weft and/or the breakage of the weft on weft feeders for looms and textile machines in general, and to a weft feeder including said device.
  • weft feeders are units that have a fixed drum on which a rotating arm winds a plurality of turns of thread that form a reserve of weft.
  • the reserve turns unwind from the drum on demand of the loom or textile machine, and before the reserve is depleted said rotating arm winds other turns so as to constantly supply the reserve of turns; a series of rods that move in a wavelike manner causes the axial advancement of the turns fed from the base toward the head of the drum of the unit.
  • a detection device which is sensitive to the presence of the reserve turns of the thread, activates the rotating arm when the number of said turns of the reserve drops below a preset limit.
  • Devices for detecting the presence of the turns of reserve thread based on the use of one or more light ray emitting devices, generally constituted by photodiodes, and of one or more receivers for said light rays, generally constituted by phototransistors, are already known.
  • a first method consists in detecting, by means of the phototransistor, or receiver, the change produced by the interference of the thread in the light rays that are emitted by the photodiode and reflected by a mirror on top of which the turns of thread are arranged.
  • a second known method consists in detecting the light rays that are reflected by said thread and emitted by said photodiode.
  • the change in the reflected light rays produced by the interference of the thread is in fact very small and hard to detect, with the result that the useful signal emitted by the phototransistor is uncertain, very weak and often lower than the evaluation limit with respect to the "noise" threshold corresponding to the ambient lighting.
  • the greatest drawback of the second known detection method resides in that the light reflection index is highly affected by the color and count of the thread and this circumstance causes considerable problems in the calibration, which must be changed each time according to the characteristics of the thread being processed. Furthermore, the signal emitted by the phototransistor is greatly affected by the level of the ambient light in this case as well.
  • a principal aim of the present invention is essentially to eliminate these severe drawbacks, and within the scope of this general aim, another important object of the invention is to provide an optical device for detecting the presence of reserve turns of weft as specified that is capable of providing a signal of substantial amplitude which is independent of the color, count and kind of the thread being processed.
  • a particular and important object of the present invention is to obtain a device that can provide a signal that has a substantially constant value and is independent of the presence and intensity of the ambient light.
  • Another object of the invention is to provide a device which is structurally simple, has limited dimensions and is reliable in operation.
  • an optical device for detecting the presence of a reserve of weft and/or the breakage of the weft characterized in that it comprises an emitter diode and a phototransistor which are arranged at the same face of a transparent plate which is associated with the drum of the weft feeder and on which the turns of the weft reserve rest; in that the emitter directs onto the transparent plate a beam of incident rays which is tilted at a preset angle of incidence with respect to said plate; and in that the phototransistor receives a beam of rays that emerge from said transparent plate at an angle of reflection, with respect to said plate, which is different from the angle of incidence produced by multiple-reflection means located at the other face of the transparent plate; and in that the incident and/or emerging rays are interrupted by a turn of the reserve of thread when said turn reaches the plate, so as to screen the receiver from the
  • the multiple-reflection means include a pair of opposite reflecting surfaces which are mutually orientated so that the beam of incident rays and the beam of emerging rays mutually intersect at a point lying on the surface plane of the transparent plate, so that when a turn of weft is located at said intersection point it interrupts both said incident rays beam and said emerging rays beam, thus screening the phototransistor from the light.
  • the reference numeral 10 generally designates the weft feeder, which includes a fixed drum 11 on which a hollow rotating arm 12, rigidly coupled to a driving shaft 13 which is also hollow, winds a plurality of turns of thread F that forms a thread reserve RF.
  • the thread On demand of the loom or other textile machine, the thread unwinds from the drum and passes, in a known manner, through a braking means 14 and a thread guiding eyelet 15.
  • the thread reserve is constantly compensated by the arm 12 which is activated by a turn presence sensor S and winds new turns of thread onto the drum 11 when the reserve drops below a preset number of turns.
  • a series of rods 16 that move in a wavelike manner produces, in a known manner, the axial advancement of the turns fed by the arm 12, by moving them from the base toward the head of the drum 11.
  • the turn presence sensor S includes a photodiode 17 and a phototransistor 18, or other equivalent emitter and receiver means, which are arranged at the same face of a plate of transparent material 19 which is provided on the drum 11 and on which the turns of the thread reserve RF rest.
  • the photodiode 17 directs onto the transparent plate 19 a beam of incident rays R1 which is inclined with respect to said plate by an angle of incidence ⁇ .
  • the phototransistor 18 is arranged along the path of a beam R2 of rays that emerge from the plate 19 at an angle ⁇ , briefly termed reflection angle, with respect to said plate.
  • the plate 19 At the face of the plate 19 that is directed toward the drum 11 there are multiple optical reflection means 20 for bending the incident rays R1 so that the angle ⁇ produced by the emerging rays R2 is significantly different from the angle of incidence ⁇ .
  • the optical reflection means 20 include a pair of opposite reflecting surfaces 21-22 which are inclined by respective angles ⁇ and ⁇ with respect to the plate and form a reflection triangle.
  • the incident rays R1 which are inclined (minus a correction factor due to the refraction of the plate 19) by an angle ⁇ /2 with respect to the first reflecting surface 21, strike said surface at a point of incidence A and are reflected, parallel to the plate 19, onto the surface 22, which they strike in a respective point of incidence B.
  • the rays R2 are reflected from this surface onto the plate 19, forming a reflection triangle A-B-V, and emerge from the plate 19 so as to form with it an angle which is equal (minus the refraction correction factor) to twice the reflection angle ⁇ /2 on the surface 22.
  • the inclinations ⁇ and ⁇ of the reflecting surfaces 21-22 are chosen so that they are equal to 90 o - ⁇ /2 and 90 o - ⁇ /2 respectively, as clearly shown in figure 3.
  • the same figure also shows that the incident rays R1 and the emerging ones R2 mutually intersect at the point V which coincides with the vertex of the reflection triangle and lies on the plane of the plate 19.
  • the phototransistor 18 being completely screened from the light, emits a signal "s" that indicates the presence of turns; this signal, in accordance with the stated aim and objects, is fully free from uncertainties and has a constant and substantial amplitude.
  • the plate 19 and the reflecting surfaces 21 and 22 can be part of a single optical prism such as 30, in which preferably the outer face of the surfaces 21 and 22 is covered with reflecting material.
  • the surfaces 21 and 22 are constituted by individual mirrors which are supported by a container that is closed by the transparent plate 19.
  • FIG 4 illustrates the arrangement of a weft feeder such as 10 which includes, in addition to the described sensor S, a second identical sensor S' which is arranged at the base of the drum 11 to detect whether the weft thread F has broken and provide the loom, or other user machine, with a corresponding thread breakage signal.
  • a weft feeder such as 10 which includes, in addition to the described sensor S, a second identical sensor S' which is arranged at the base of the drum 11 to detect whether the weft thread F has broken and provide the loom, or other user machine, with a corresponding thread breakage signal.
  • Figures 5 and 6 illustrate a different embodiment of the sensor S according to the invention, particularly suitable for very fine or particularly shiny weft threads.
  • the incident rays R1 and the emerging ones R2 form, with respect to the plane of the plate 19, respective angles ⁇ and ⁇ that can be indifferently equal or different, and the extensions of said rays mutually intersect at a virtual point V' that lies outside the plate 19 on the side where the photodiode 17 and the phototransistor 18 are located.
  • a cup-shaped recess 31 is formed on the plate 19 and accommodates a stud 32 that cooperates with the multiple-reflection means 20.
  • the stud 32 which is made of opaque material, can move in contrast with the action of a spring 33 and has an enlarged head 34 shaped like a spherical segment and a stem 35 that extends beyond the bottom of the recess 31, at right angles to the plane of the plate 19, on the side of the reflecting surfaces 21 and 22.
  • the stud 32 is normally retained by the spring 33 in the inactive position shown in figure 5, in which the head 34 protrudes with respect to the plate 19.
  • the stem 35 lies above the base "1" of the reflection triangle A-B-V' and therefore does not interfere with the rays reflected by the reflecting surface 21 onto the reflecting surface 22. Accordingly, a beam of reflected rays R2 strikes the phototransistor 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Quality & Reliability (AREA)
  • Looms (AREA)
EP94107218A 1993-05-10 1994-05-09 Vorrichtung zur optischen Detektion eines Schussfadens und diese Vorrichtung umfassender Schussfadenspeicher Expired - Lifetime EP0624674B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO930323A IT1270929B (it) 1993-05-10 1993-05-10 Dispositivo ottico per rilevare la presenza di riserva di trama e/o la rottura di trama su apparecchi alimentatori di trama per macchine tessili ed apparecchio alimentatore di trama incorporante detto dispositivo
ITTO930323 1993-05-10

Publications (2)

Publication Number Publication Date
EP0624674A1 true EP0624674A1 (de) 1994-11-17
EP0624674B1 EP0624674B1 (de) 1997-08-06

Family

ID=11411474

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94107218A Expired - Lifetime EP0624674B1 (de) 1993-05-10 1994-05-09 Vorrichtung zur optischen Detektion eines Schussfadens und diese Vorrichtung umfassender Schussfadenspeicher

Country Status (3)

Country Link
EP (1) EP0624674B1 (de)
DE (1) DE69404742T2 (de)
IT (1) IT1270929B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998046511A1 (en) * 1997-04-17 1998-10-22 Giuseppe Vischiani Device for controlling the accumulation and supply of yarn to textile machines
EP0873961A2 (de) * 1997-04-24 1998-10-28 L.G.L. Electronics S.p.A. Optisches Sensorelement für eine Schussfadenreserve-Überwachungsvorrichtung und Fadenliefergerät mit solchem Sensorelement

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1288339B (de) * 1963-10-09 1969-01-30 Reiners Vorrichtung zur elektro-optischen UEberwachung von Faeden oder aehnlichem Gut
EP0174039A2 (de) * 1984-09-04 1986-03-12 Picanol N.V. Geschwindigkeitsregler für den Fadenspeicher einer Webmaschine
EP0199059A1 (de) * 1985-04-22 1986-10-29 ROJ ELECTROTEX S.p.A. Schussfadenspeicher für eine Webmaschine
EP0327973A1 (de) * 1988-02-11 1989-08-16 ROJ ELECTROTEX S.p.A. Garnlieferungsvorrichtung für Textilmaschinen
WO1992009516A1 (de) * 1990-11-26 1992-06-11 Iro Ab Optische fühleinrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1288339B (de) * 1963-10-09 1969-01-30 Reiners Vorrichtung zur elektro-optischen UEberwachung von Faeden oder aehnlichem Gut
EP0174039A2 (de) * 1984-09-04 1986-03-12 Picanol N.V. Geschwindigkeitsregler für den Fadenspeicher einer Webmaschine
EP0199059A1 (de) * 1985-04-22 1986-10-29 ROJ ELECTROTEX S.p.A. Schussfadenspeicher für eine Webmaschine
EP0327973A1 (de) * 1988-02-11 1989-08-16 ROJ ELECTROTEX S.p.A. Garnlieferungsvorrichtung für Textilmaschinen
WO1992009516A1 (de) * 1990-11-26 1992-06-11 Iro Ab Optische fühleinrichtung

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998046511A1 (en) * 1997-04-17 1998-10-22 Giuseppe Vischiani Device for controlling the accumulation and supply of yarn to textile machines
EP0873961A2 (de) * 1997-04-24 1998-10-28 L.G.L. Electronics S.p.A. Optisches Sensorelement für eine Schussfadenreserve-Überwachungsvorrichtung und Fadenliefergerät mit solchem Sensorelement
EP0873961A3 (de) * 1997-04-24 2000-06-28 L.G.L. Electronics S.p.A. Optisches Sensorelement für eine Schussfadenreserve-Überwachungsvorrichtung und Fadenliefergerät mit solchem Sensorelement
CN1088680C (zh) * 1997-04-24 2002-08-07 L·G·L·电子股份公司 监视输纬器中纬纱储备的光学探测器及包括它的输纬器

Also Published As

Publication number Publication date
IT1270929B (it) 1997-05-16
EP0624674B1 (de) 1997-08-06
ITTO930323A0 (it) 1993-05-10
ITTO930323A1 (it) 1994-11-10
DE69404742D1 (de) 1997-09-11
DE69404742T2 (de) 1998-01-08

Similar Documents

Publication Publication Date Title
US3892492A (en) Optoelectrical apparatus with directional light sources for detecting reflection behaviour of an object
US4277178A (en) Web element concentration detection system
ES2902130T3 (es) Dispositivo y procedimiento para la determinación del diámetro de un balón de hilo formado por un hilo extendido en un puesto de trabajo de una máquina textil que forma balones de hilo
CN1769889B (zh) 纱线探测装置
US6044871A (en) Optical feeler for monitoring a reserve of thread in weft feeders and weft feeder comprising said feeler
JP6670574B2 (ja) ミシン用センサアッセンブリ及びミシン
US4984896A (en) Method and apparatus for optically monitoring a knitted article
US4558723A (en) Sensor for controlling the supply of weft yarn or the like
GB1576745A (en) Weft yarn sensor
JP2932098B2 (ja) オプトエレクトロニクス糸検出装置
US3818236A (en) Apparatus for detecting broken threads or other disturbances in a fibre web
US5371374A (en) Optical sensor having a shielding element for preventing reception of undesirable reflected light
EP0624674B1 (de) Vorrichtung zur optischen Detektion eines Schussfadens und diese Vorrichtung umfassender Schussfadenspeicher
KR100293027B1 (ko) 광전센서장치와씨실측정및저장장치
KR100205690B1 (ko) 직사공급기용 감지 및 분석시스템
KR970700131A (ko) 실저장소와 실공급장치 및 실저장소와 실공급장치에서 실저장을 검출하는 방법(method for detecting a yarn store in a yarn storage and feed device, and yarn storage and feed device)
JPH0229586B2 (de)
JP3933706B2 (ja) 杼口と緯止め装置の中に緯糸を挿入する際の光学式監視のための方法
US4158372A (en) Process and device for watching the weft on weaving looms
US3053139A (en) Electro-optical weft feeler for looms
US2911013A (en) Photoelectric weft detecting system for loom
US3590882A (en) Optical weft stop motion for a weaving machine
KR19980056187U (ko) 레이져를 이용한 직기용 경사 탐지장치
RU2049712C1 (ru) Датчик контроля прохождения нити на текстильной машине
JPS5876571A (ja) 毛羽検出方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): BE CH DE LI SE

17P Request for examination filed

Effective date: 19950407

17Q First examination report despatched

Effective date: 19960116

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE CH DE LI SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19970806

Ref country code: CH

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19970806

Ref country code: BE

Effective date: 19970806

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 69404742

Country of ref document: DE

Date of ref document: 19970911

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19971106

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070731

Year of fee payment: 14

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20081202