EP1502979A1 - Procédure de contrôle de fil de trame dans un métier à tisser - Google Patents

Procédure de contrôle de fil de trame dans un métier à tisser Download PDF

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Publication number
EP1502979A1
EP1502979A1 EP03017041A EP03017041A EP1502979A1 EP 1502979 A1 EP1502979 A1 EP 1502979A1 EP 03017041 A EP03017041 A EP 03017041A EP 03017041 A EP03017041 A EP 03017041A EP 1502979 A1 EP1502979 A1 EP 1502979A1
Authority
EP
European Patent Office
Prior art keywords
sheet
weft
light
reflector
weft thread
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
EP03017041A
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German (de)
English (en)
Other versions
EP1502979B1 (fr
Inventor
Erich Weidmann
Walter Schümperli
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.)
Loepfe AG Gebrueder
Original Assignee
Loepfe AG Gebrueder
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 Loepfe AG Gebrueder filed Critical Loepfe AG Gebrueder
Priority to EP20030017041 priority Critical patent/EP1502979B1/fr
Priority to DE50309321T priority patent/DE50309321D1/de
Publication of EP1502979A1 publication Critical patent/EP1502979A1/fr
Application granted granted Critical
Publication of EP1502979B1 publication Critical patent/EP1502979B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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 method for Weft thread monitoring in a weaving machine according to the preamble of claim 1.
  • the weft thread with optical Be monitored means such as e.g. in DE-U-91 02 313 is disclosed.
  • a reflector arranged, which is irradiated by a light source becomes. Reflected by the reflector light is from measured by a detector. If the weft thread gets during passing through the compartment to the reflector, so is in the detector generates a signal.
  • the measurement thus takes place only take place after the weft thread completely into the tray has been entered and moved against the sheet stop becomes.
  • an optical sensor in particular in Form a photocell, so arranged that the weft passes through the measuring range and or at least in this occurs while the sheet is against the stop emotional.
  • This can e.g. be achieved by the Measuring range against the weft and / or the weft is moved against the measuring range. It is checked whether the weft thread the measuring range in a certain Target time range reached or traversed - if so is not the case, so can be closed on an error become.
  • the measuring range is arranged that the weft thread is only detected when the Sheet is moved against the stop. This allows a late measurement.
  • the measuring range is during the weft insertion preferably offset laterally to the entry line of the weft, so that the weft during the entry in the subject is not recorded. Only after made entry, the weft thread passes in the course of his Move to stop laterally in the measuring range. Again, this allows a late measurement.
  • a relative movement between measuring range and weft yarn can generate the movement of the sheet and / or the movement of the thread.
  • a light transmitter and / or a light sensor and / or a mirror can be arranged on the sheet and move with the leaf. Be both light source as well as light sensor arranged on the sheet, so can the measuring range can be moved by the sheet and the Weft, for example, just before contact with the Capture leaf.
  • the measuring range is at the beginning, at the end or in a gap, leaving under gap an area to understand, in which the distance between two successive warp threads much larger than that normal warp spacing is. In these places is relative a lot of space is available and the warp threads disturb the Measurement not.
  • Figs. 1 and 2 show a portion of the weft arrival side a projectile loom. Visible, noticeable is the sheet 1 with a plurality of leaf bars 2 and a clamp 3 for the weft 4. Schematically represented is also the tray 5 and the already woven goods 6 with the sheet stop 7.
  • an optical sensor 10 is provided.
  • first embodiment consists of Sensor comprising a head part 20, a connecting part 21 and a foot part 22.
  • the head part 20 is e.g. with a Clamped screw 23 on the upper crossbar 24 of the sheet 1 and the foot part 22 e.g. with a screw 25 am lower crossbar 26 of the blade 1.
  • the connecting part 21 consists of an elongated plate and connects the Head part 20 with the foot part 22. It can e.g. as a printed circuit board be executed, the electrical connection lines 28 carries between the headboard 20 and foot part 22.
  • a light source 15 is arranged, a light beam 17 on a detector 19 in Headboard 20 throws.
  • the sensor 10 thus forms a light barrier with a measuring range 27, which is between Light source 15 and detector 19 extends.
  • the sensor 10 and the measuring area 27 move with the sheet 1.
  • the measuring area 27 is arranged such that that he is currently outside the subject, so that the warp threads are not in the measuring range 27 to step.
  • the signal pulse is always at the same time (i.e., at the same time in the machine cycle). If no signal pulse is detected at this time, so can thus closed on a mistake and a corresponding Error signal are generated, which is e.g. to stopping the machine.
  • the time of the signal pulse its length or duration can also be measured which is a measure of the time during which the Weft is located in the measuring range. This period of time is when the measuring area 27 transversely to the longitudinal direction of the Weft moves, a measure of the thickness of the weft.
  • the amplitude of the signal can be measured, which is also a measure of the cross section or the Diameter of the thread compared to the cross-sectional area of the measuring range.
  • the weft in the This can also be done over the length or u.U. the amplitude of the signal pulse are measured since the weft in this case loses its tension and visually thicker or multi-layered in the measuring range to come to rest. In both cases, by comparison the measured time duration with a target time duration and / or by comparing the measured amplitude with a Target amplitude of the error can be determined.
  • the measuring range 27 not too thick to choose or in the detector 19 is an imaging optics to provide the Weft 4 in a suitable size ratio on the Light detector images.
  • Calibration measurements are carried out, e.g. during the normal operation of the loom can happen. For example can signal during several machine cycles recorded by the light detector and the waveform averaged over the cycles. Then you can Setpoint time, setpoint duration and setpoint time amplitude or a desired signal waveform determined from the averaged signal become. It is also possible, later waveforms e.g. by subtraction, division or correlation calculation to compare with the averaged waveform.
  • two measurements are preferably made.
  • a first measurement takes place for a short time the expected time of the weft signal instead of and serves as a reference.
  • the expected time of Weft signal then becomes a measurement relative to this reference, e.g. by the weft signal is divided by the reference signal or the Reference signal from the weft signal is subtracted.
  • the optical components are eliminated.
  • Fig. 4 shows a second embodiment of the inventive Sensor.
  • the Light source 15 sends the light through the beam splitter 18th in the measuring range 27. It hits a reflector or Mirror 29, which is arranged on the head part 20. From there it is thrown back onto the beam splitter 18, from where a part is reflected on the light detector 19.
  • These Design has the advantage that no electrical connection between foot and headboard is necessary. Possibly can also be dispensed with the connecting part 21 become.
  • Fig. 5 to 7 is a third embodiment shown the thread monitor.
  • the optical includes Sensor 10 a stationary on the frame 11 of the loom arranged sensor head 12 and one arranged on the sheet 1 Reflector 13.
  • a laser light source 15 ' which, optionally with appropriate optics 16, a bundled, essentially non-divergent light beam 17 generated, which generates the measuring area 27.
  • the light beam 17 passes through a beam splitter 18 and then falls the reflector 13, where a light spot of preferably at most 1 mm in diameter is generated.
  • the reflector 13 is retroreflective, i. its surface is like that, that he prefers to throw light back in the direction from which it arrives.
  • Corresponding reflectors are used e.g. from the company 3M under the trade name 3M Scotchlite Diamond Grade offered.
  • the reflector is on the outermost leaf strut 2a of the sheet 1, i. at the entry direction seen last leaf strut, and indeed whose outside and thus outside of the compartment 5.
  • the reflected light from the reflector 13 occurs at least partially in turn onto the beam splitter 18, of where it is thrown onto a light detector 19 '.
  • each weft may be caught by the clamps.
  • this now moves Sheet 1 in the direction of the arrow S against the sheet stop 7 of the product 6, wherein pulled through a first position of the Blatts and dashed a later second position shown becomes.
  • the clamp 4 also moves Towards sheet stop 7. It sweeps over the Weft 4 at least part of the reflector thirteenth
  • the components of the weft guard are arranged so that at least during a part of this movement the light beam 17 strikes the reflector 13, and that During this time, the weft 4 once moved by the light beam 17, resulting in a change the amount of light measured in the light detector 19 'and thus leads to a corresponding signal pulse.
  • the reflector is, as mentioned, on the side the last leaf strut 2a, in which the leaf stop 7 facing edge arranged, so he with the weft thread comes into contact. This leads to a continuous cleaning of the reflector and to a good Contrast ratio of the signal pulse.
  • the described third embodiment are light source 15 ', beam splitter 18 and light detector 19 'arranged together in the sensor head 12.
  • a diffuse reflector can also be used, wherein In this case, however, the measurement signal is weaker.
  • a reflective reflector the reflected light beam practically not returned to the light source, but in this case Light source and detector very close to the reflector or must be mounted separately from each other, making the adjustment difficult.
  • the measurement can also be in a gap of the sheet between two tracks.
  • the light source 15 or 15 'and / or the Lichtdektetor 19 can also be used as an optical waveguide be arranged with one arranged at another place Light transmitter or detector module connected are.
  • the method described here allows a Measuring the weft thread late in the machine cycle, to which the weft already completely entered the subject and the sheet is already moved against the leaf stop. Thus, too very late breaks or other errors are still detected.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP20030017041 2003-07-28 2003-07-28 Procédure de contrôle de fil de trame dans un métier à tisser Expired - Lifetime EP1502979B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20030017041 EP1502979B1 (fr) 2003-07-28 2003-07-28 Procédure de contrôle de fil de trame dans un métier à tisser
DE50309321T DE50309321D1 (de) 2003-07-28 2003-07-28 Verfahren zur Schlussfadenüberwachung in einer Webmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20030017041 EP1502979B1 (fr) 2003-07-28 2003-07-28 Procédure de contrôle de fil de trame dans un métier à tisser

Publications (2)

Publication Number Publication Date
EP1502979A1 true EP1502979A1 (fr) 2005-02-02
EP1502979B1 EP1502979B1 (fr) 2008-03-05

Family

ID=33522288

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030017041 Expired - Lifetime EP1502979B1 (fr) 2003-07-28 2003-07-28 Procédure de contrôle de fil de trame dans un métier à tisser

Country Status (2)

Country Link
EP (1) EP1502979B1 (fr)
DE (1) DE50309321D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2098624A1 (fr) 2008-03-07 2009-09-09 Gebrüder Loepfe AG Surveillance de fils de trame dans un métier à tisser

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4188981A (en) * 1976-06-17 1980-02-19 Nissan Motor Company, Limited Weft yarn sensor
US5083584A (en) * 1989-04-07 1992-01-28 Gebruder Loepfe Ag. Weft yarn detector for a shuttleless weaving loom
JPH04370249A (ja) * 1991-06-14 1992-12-22 Tsudakoma Corp 光学的緯糸検知装置
JPH07300748A (ja) * 1994-04-26 1995-11-14 Tsudakoma Corp 無杼織機の緯入れ検知フィーラー

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4188981A (en) * 1976-06-17 1980-02-19 Nissan Motor Company, Limited Weft yarn sensor
US5083584A (en) * 1989-04-07 1992-01-28 Gebruder Loepfe Ag. Weft yarn detector for a shuttleless weaving loom
JPH04370249A (ja) * 1991-06-14 1992-12-22 Tsudakoma Corp 光学的緯糸検知装置
JPH07300748A (ja) * 1994-04-26 1995-11-14 Tsudakoma Corp 無杼織機の緯入れ検知フィーラー

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 243 (C - 1058) 17 May 1993 (1993-05-17) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 03 29 March 1996 (1996-03-29) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2098624A1 (fr) 2008-03-07 2009-09-09 Gebrüder Loepfe AG Surveillance de fils de trame dans un métier à tisser

Also Published As

Publication number Publication date
EP1502979B1 (fr) 2008-03-05
DE50309321D1 (de) 2008-04-17

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