US3631901A - Photoelectric weft-bobbin feeler for looms for monitoring the yarn stock on weft bobbins - Google Patents

Photoelectric weft-bobbin feeler for looms for monitoring the yarn stock on weft bobbins Download PDF

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Publication number
US3631901A
US3631901A US33114*A US3631901DA US3631901A US 3631901 A US3631901 A US 3631901A US 3631901D A US3631901D A US 3631901DA US 3631901 A US3631901 A US 3631901A
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United States
Prior art keywords
light
bobbin
light beam
set forth
weft
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Expired - Lifetime
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US33114*A
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English (en)
Inventor
Erwin Langenbach
Jurgen Erdmann
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Erwin Sick GmbH Optik Elektronik
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Erwin Sick GmbH Optik Elektronik
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    • 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
    • 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
    • B65H63/08—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle
    • B65H63/086—Warning or safety devices, e.g. automatic fault detectors, stop-motions ; Quality control of the package responsive to delivery of a measured length of material, completion of winding of a package, or filling of a receptacle responsive to completion of unwinding of a package
    • 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

  • This invention relates to improvements in a photoelectric weft bobbin feeler for looms for monitoring the yarn stock on weft bobbins comprising: first means for scanning the surface of the weft bobbin by the use of a scanning light beam, second means for affecting said scanning light beam mounted on said surface, said second means becoming exposed to reflections from said light beam when said yarn stock is drawn near the end, and third means for producing a first signal indicative of the approximately empty" state of the bobbin responsive to said first afi'ecting means being exposed.
  • Photoelectric weft-bobbin feelers have been provided to fulfill these requirements. There are substantially two types of such photoelectric weft-bobbin feelers:
  • light-modulating devices are affixed to the surface of the weft bobbin. These devices become exposed as the yarn stock approaches the end. A light beam directed to the surface of the weft bobbin impinges upon the light-modulating device. The reflected modulated light beam falls on a photoelectric detector and initiates appropriate operations such as the change of bobbins or stopping of the loom.
  • the light-modulating device can, for example, be a pattern of alternating colored rings comprising contrasting colors, one ring absorbing light and the next one reflecting it. Since the light is modulated, it will. produce an altemating-current-type electrical signal upon being received by the photoelectric detector, which signal is used for the control of further operations (see German Pat. No. 850,730).
  • a second type of photoelectric weft-bobbin feeler comprises a ring of reflex-reflecting substance or layer on the surface of the weft bobbin. Again a light beam is directed to the weft bobbin. When the weft bobbin is approximately empty, nearly all of the incident light beam is reflected back into the direction of incidence or into a small scattering angle thereabout. This reflected beam falls on a photoelectric detector and initiates appropriate operations (see German specifications 1,056,856 and 1,162,297 and US. Pat. No. 3,053,137).
  • a spurious light modulation can be effected by some other sequence of light and dark spots, such as the light surface of the weft bobbin and dark yarn.
  • the first-mentioned type of weft-bobbin feeler will produce a false signal.
  • second means for affecting a scanning light beam mounted on the said second affecting means being also scanned by a scanning light beam at the same time as the said first affecting means, second signal-producing means for producing a second signal indicative of the moment or period of time in which the bobbin is to be scanned and means for initiating control operations responsive to said first and second signals from said first and second signal-producing means.
  • a light beam is directed toward the bobbin which beam is divided into two components. One component is coded to indicate whether or not the bobbin is approximately empty. The second component is coded in a different manner to signify the proper time for reading the first component.
  • the coding can be by pulsing the beam or by the position of the component when reflected.
  • said scanning means are adapted to produce one single light beam for scanning both said light-affecting means, and said affecting means are adapted to afl'ect said light beam in different ways so as to produce two signals discernible from each other.
  • the required optical apparatus is not much more than in the prior art devices, i.e., only one scanning light beam is required.
  • This single light beam can, for example, be modulated in difi'erent ways by the two afi'ecting means.
  • the modulated output signals from a single photoelectric detector, on which the modulated scanning light beam falls, can be separated by appropriate electronic circuits.
  • the signals can be separated optically. This is done in an embodiment of the invention, wherein said single scanning light beam is directed to said two afi'ecting means at an acute angle, the first affecting means being adapted to regularly reflect said light beam to a first photoelectric detector, the second affecting means being adapted to reflect said light beam back into its direction of incidence to a second photoelectric detector.
  • the output signals of said first and second detectors are then applied to an AN D-gate to produce a correction signal when they coincide.
  • This embodiment of the invention offers the particular advantage that the separation of the two signals is effected in simple manner by making use of optical laws; the additional apparatus, as compared to the prior art, being little more than one additional photoelectric detector.
  • a specific embodiment of the invention is a photoelectric weft-bobbin feeler, wherein the surface of the bobbin (mounted in the shuttle) is scanned by the incident light beam through an elongated aperture in the shuttle, wherein below said aperture specularly reflecting and light-absorbing rings are provided on the surface of the bobbin and alternating in fore-and-aft direction thereof, and wherein a reflex-reflector is attached to the shuttle adjacent and along said aperture, the scanning light beam having elongated cross section to scan over the rings and the reflex-reflector at the same time.
  • alternating reflecting and light-absorbing rings Thereby a simple arrangement is obtained which can be used easily in conventional looms. Further advantages are achieved, by using alternating reflecting and light-absorbing rings.
  • the scanning light beam is modulated and the photoelectric detector produces an altemating-current (AC)- type signal. This signal is fed to a dynamic AC amplifier, whereby all false actuations resulting from yarn reflexes will be eliminated.
  • AC alternating-current
  • AC signal that can be evaluated reliably will be produced even by one reflecting and one adjacent light-absorbing ring.
  • the AC signal" occurring during the scanning will be a step signal caused by the line of contrast between the rings.
  • the contrast step can be obtained by making the bobbin surface dark
  • the contrast step occurs when the beam scans from the bobbin surface to the remaining yarn. The same situation will occur if dark yarn is to be processed and the bobbin surface has been made reflecting.
  • FIG. 1 schematically illustrates a portion of a shuttle, the weft bobbin and the photoelectric feeler at the moment of the scanning of the bobbin and shuttle;
  • FIG. 2 shows a portion of the shuttle and the aperture through which the bobbin is viewed
  • FIG. 3 is a block diagram of the electronic evaluation circuit.
  • reference numeral 1 designates the photoelectronic feeler device.
  • the light beam reflected by the reflex-reflector 13 back along its path of incidence is deflected by the partially transparent mirror 4.
  • the deflected portion reaches photoelectric detector 6 through lens 5.
  • Another portion of the light beam passes through aperture 12 (at one side of the reflex-reflector 13). This portion strikes the weft bobbin 9. This portion of the light beam is specularly reflected from the surface of the weft bobbin (when there is no more yarn on the bobbin) and reaches photoelectric detector 8 through a lens 7.
  • Reference numeral 11 designates the wall of the shuttle in which the weft bobbin 9 is mounted. It has the aperture 12 through which a portion of the light beam gets to the weft bobbin 9.
  • Reference numeral designates a thread wound on the weft bobbin.
  • FIG. 2 illustrates, how the reflex-reflector 13 is positioned on the shuttle wall adjacent the aperture 12.
  • the weft bobbin would be behind this aperture 12.
  • the light beam 16 has an elongated cross section, as shown in dotted lines. This elongation is transverse to the direction of movement of the shuttle so that the reflex-reflector I3 and the surface of the weft bobbin are scanned simultaneously.
  • FIG. 3 illustrates, in principle, how the output signals from the two detectors 6 and 8 are evaluated.
  • the output signals are applied to an AND-gate 19 through two amplifiers l7 and 18.
  • the output signal of the AND-gate is a correction signal to control (in a well-known manner not shown) further operations. For example, this correction signal initiates the automatic change of the bobbin.
  • the correction signal from the AND-gate is produced only from detectors 6 and 8 if both signals are present.
  • the amplifier 18 produces an output signal to the AND-gate only if the input signal from the photoelectric detector 8 is of the alternating current type, i.e., it amplifies only AC signals or step signals.
  • the reflex-reflector 13 shown in FIG. 2 may be a layershaped, reflex-reflecting substance or a strip on which a plurality of small triple reflectors are arranged closely side-byside.
  • said light beam is divided into two components
  • said other component being coded in another fashion in response to said particular condition being present.
  • third means connected to the first two means to initiate said corrective signals upon the simultaneous occurrence of the first and second output signals.
  • said first and second means include a common device for producing a single light beam directed at said members and separate respective light detectors, said conditions affecting said light beam in different ways to produce two separate reflective light responses, said detectors being positioned to receive said light responses respectively.
  • said single light beam is directed at said conditions at an acute angle, said given condition reflecting said light beam to the detector of the first means, said second means including a partially reflective mirror in the path of the single light beam, said particular condiu'on including reflective means for reflecting some light from said single beam back into its direction of incidence to said mirror and the detector of the second means, said third means including an AND-gate.
  • said shuttle member has an elongated aperture through which the bobbin member is viewed by said single light beam and a reflex reflector at one side of said aperture, and the portion of said bobbin member so viewed by said light beam has light-reflecting and light-absorbing rings alternating in the fore-and-aft direction thereof.
  • the detector of the first means produces an alternating-current-type electric signal
  • said first means includes an amplifier which will amplify only altemating-current-type signals.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
US33114*A 1969-03-14 1970-03-12 Photoelectric weft-bobbin feeler for looms for monitoring the yarn stock on weft bobbins Expired - Lifetime US3631901A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691912913 DE1912913A1 (de) 1969-03-14 1969-03-14 Photoelektrischer Schussspulenwaechter fuer Webstuehle und Webautomaten zur UEberwachung des Garnvorrats auf Schussspulen

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US3631901A true US3631901A (en) 1972-01-04

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US33114*A Expired - Lifetime US3631901A (en) 1969-03-14 1970-03-12 Photoelectric weft-bobbin feeler for looms for monitoring the yarn stock on weft bobbins

Country Status (6)

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US (1) US3631901A (de)
BE (1) BE747090A (de)
CH (1) CH509443A (de)
DE (1) DE1912913A1 (de)
FR (1) FR2042727A5 (de)
GB (1) GB1305424A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693671A (en) * 1971-03-12 1972-09-26 Singer Co Photoelectric weft detector
US3777168A (en) * 1973-01-29 1973-12-04 Singer Co Photoelectric detector for bobbin of a weaving loom
US3892492A (en) * 1972-10-16 1975-07-01 Loepfe Ag Geb Optoelectrical apparatus with directional light sources for detecting reflection behaviour of an object
US4163158A (en) * 1978-04-25 1979-07-31 The Singer Company Sewing machine bobbin thread run-out alarm using reflected light
US4188545A (en) * 1975-06-30 1980-02-12 Imperial Chemical Industries Limited Yarn processing, method and apparatus
US4188902A (en) * 1979-05-18 1980-02-19 The Singer Company Bobbin thread run-out detectors
DE4009370A1 (de) * 1990-03-23 1991-09-26 Gregor Gebald Verfahren zum herstellen einer kreuzspule und danach hergestellte kreuzspule
US5247184A (en) * 1992-04-03 1993-09-21 Wardwell Braiding Machine Company Photoelectric bobbin sensor with retroreflective filament presence detection
US5371374A (en) * 1990-11-26 1994-12-06 Iro Ab Optical sensor having a shielding element for preventing reception of undesirable reflected light
CN111307034A (zh) * 2018-12-12 2020-06-19 丰田自动车株式会社 位置检测方法以及位置检测装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1255065B (de) * 1966-07-30 1967-11-30 Richard Karnebogen Schlagbohrkopf fuer pressluftbetriebene Versenkhaemmer
DE2921110A1 (de) * 1979-05-25 1980-12-04 Leuze Electronic Kg Einen lichtsender und einen lichtempfaenger aufweisende lichtelektrische anordnung

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1292613A (fr) * 1961-06-19 1962-05-04 Rueti S A Succession De Gaspar Casse-trame photo-électrique
CH420000A (de) * 1962-08-10 1966-08-31 Scheffel Walter Verfahren zur pneumatischen Schussfadeneintragung und Webstuhl zur Ausführung desselben

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1292613A (fr) * 1961-06-19 1962-05-04 Rueti S A Succession De Gaspar Casse-trame photo-électrique
CH420000A (de) * 1962-08-10 1966-08-31 Scheffel Walter Verfahren zur pneumatischen Schussfadeneintragung und Webstuhl zur Ausführung desselben

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3693671A (en) * 1971-03-12 1972-09-26 Singer Co Photoelectric weft detector
US3892492A (en) * 1972-10-16 1975-07-01 Loepfe Ag Geb Optoelectrical apparatus with directional light sources for detecting reflection behaviour of an object
US3777168A (en) * 1973-01-29 1973-12-04 Singer Co Photoelectric detector for bobbin of a weaving loom
US4188545A (en) * 1975-06-30 1980-02-12 Imperial Chemical Industries Limited Yarn processing, method and apparatus
US4163158A (en) * 1978-04-25 1979-07-31 The Singer Company Sewing machine bobbin thread run-out alarm using reflected light
US4188902A (en) * 1979-05-18 1980-02-19 The Singer Company Bobbin thread run-out detectors
DE4009370A1 (de) * 1990-03-23 1991-09-26 Gregor Gebald Verfahren zum herstellen einer kreuzspule und danach hergestellte kreuzspule
US5371374A (en) * 1990-11-26 1994-12-06 Iro Ab Optical sensor having a shielding element for preventing reception of undesirable reflected light
US5247184A (en) * 1992-04-03 1993-09-21 Wardwell Braiding Machine Company Photoelectric bobbin sensor with retroreflective filament presence detection
CN111307034A (zh) * 2018-12-12 2020-06-19 丰田自动车株式会社 位置检测方法以及位置检测装置
CN111307034B (zh) * 2018-12-12 2022-10-11 丰田自动车株式会社 位置检测方法以及位置检测装置

Also Published As

Publication number Publication date
CH509443A (de) 1971-06-30
FR2042727A5 (de) 1971-02-12
DE1912913A1 (de) 1970-10-01
GB1305424A (de) 1973-01-31
BE747090A (fr) 1970-08-17

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