EP0221546B1 - Casse-fil optique pour la chaîne d'alimentation de machines à tufter - Google Patents

Casse-fil optique pour la chaîne d'alimentation de machines à tufter Download PDF

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Publication number
EP0221546B1
EP0221546B1 EP86115346A EP86115346A EP0221546B1 EP 0221546 B1 EP0221546 B1 EP 0221546B1 EP 86115346 A EP86115346 A EP 86115346A EP 86115346 A EP86115346 A EP 86115346A EP 0221546 B1 EP0221546 B1 EP 0221546B1
Authority
EP
European Patent Office
Prior art keywords
monitoring apparatus
thread breakage
accordance
retroreflecting
needle
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.)
Expired
Application number
EP86115346A
Other languages
German (de)
English (en)
Other versions
EP0221546A1 (fr
Inventor
Walter Von Stein
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.)
Erwin Sick GmbH Optik Elektronik
Original Assignee
Erwin Sick GmbH Optik Elektronik
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 Erwin Sick GmbH Optik Elektronik filed Critical Erwin Sick GmbH Optik Elektronik
Publication of EP0221546A1 publication Critical patent/EP0221546A1/fr
Application granted granted Critical
Publication of EP0221546B1 publication Critical patent/EP0221546B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05C—EMBROIDERING; TUFTING
    • D05C15/00—Making pile fabrics or articles having similar surface features by inserting loops into a base material
    • D05C15/04—Tufting
    • D05C15/08—Tufting machines
    • D05C15/16—Arrangements or devices for manipulating threads
    • D05C15/18—Thread feeding or tensioning arrangements
    • 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 invention relates to an optical thread break monitoring device for tufting machines with a laser beam scanning device which generates a laser steel which carries out a constantly repetitive fast scanning movement perpendicularly to the needles of the row of needles and which, if it breaks due to a thread break or through the thread gaps to one behind the other Arranged retroreflector strips arranged needles processed threads, is thrown back in itself and strikes in the laser beam scanning device on a photoreceiver, which is connected to an electronic evaluation system which emits an error signal in the event of a change in the periodic signal normally present.
  • the retroreflector strip is attached to a special reflector rail which rests directly on the substrate to be processed on the tufting machine behind the row of needles.
  • the reflector rail reflects the incident scanning laser beam back to the scanning device between the tufting threads through the gap between the needle bar in the highest stroke and the carrier material.
  • This arrangement has the disadvantage that the reflector rail hinders the view of the machine directly at the needle, and this over a length of up to 40 mm in the direction of transport of the carrier material.
  • the reflector rail also prevents the threading of broken threads and the passage of sewn-on backing material, as occurs when changing a roll of backing material.
  • the splice or seam formed here can be up to four times as thick as the backing material itself.
  • the seam can be easily pulled through the approx. 3 to 5 mm gap between the backing material and the highest needle stroke under the needle tips over the entire width of approx. 5 m, but the fixed reflector rail hinders this pulling forward of the backing material web.
  • the passage gap below the reflector rail is so narrow that the reflector rail must be raised when performing the splice, but this entails the risk of misalignments. In certain cases, the reflector rail must even be removed.
  • the gap between the needle tip is in the upper position located needle beam and carrier material, which comes alone for the measurement in question, is so small that only a very narrow Retrore- flektorstre i fen and a short scanning light of, for example 2 mm usable are what Adjustment problems.
  • the aim of the invention is therefore to provide an optical thread break monitoring device of the type mentioned at the outset, in which the retroreflector strip is arranged in such a way that it does not in any way impede the view into the machine or its operation, the error detection being to be improved still further, in that any thread defects that occur are recognized in the carrier material before the thread is processed, and the adjustment of the laser beam on the retroreflector strip is unproblematic.
  • the invention provides that the retroreflector strip is attached above the needle tube of the needles on the front of the needle bar.
  • the retroreflector strip is preferably arranged in the lower half of the needle bar.
  • the retroreflector strip can also be much wider e.g. 10 to 15 mm wide, so that the adjustment of the laser beam relative to the retroreflector is much easier.
  • each retroreflector strip is expediently only between 10 and 20 cm long, the entire retroreflector strip is expediently composed of a plurality of retroreflectors which are arranged one behind the other and overlap.
  • the ends of the retroreflector strips should be cut obliquely to the needle direction in the overlap area.
  • the angle of the end edges of the retroreflector strips to the needle direction should be at least 20 to 30 0 and at most 45 0 . In this way, interference with the received signal due to the overlapping areas of the adjacent retroreflector strips is avoided.
  • Retroreflector strips with a thickness of only about 0.5 mm are advantageously used.
  • the threads stretched in front of the reflector strip shade the laser beam, while the gap between the stretched threads enables the passage of the laser beam to the retroreflector strip.
  • the reflected light is redirected back into the laser beam scanning device by an autocollimation beam path and falls there on a photo receiver, which forwards it to evaluation electronics, which evaluates the received signal in the desired manner for error detection.
  • the error recognized by the laser beam scanning device is already present in the finished tufted material, due to the arrangement of the retroreflector strip according to the invention it is already reported before the error is noticeable in the finished tufted goods makes. The error can thus be recognized and remedied even before the finished tufting goods are affected by it.
  • the needle excavation from the carrier material is between 3 to 8 mm, but can also be only 2 to 3 mm for tufted loop goods and a very fast-running tufting machine.
  • a further advantageous embodiment of the invention is characterized in that, with a width of the laser scanning light spot of approximately 0.2 mm, the height of the scanning light spot is 3 to 7 mm, in particular 4 to 6 mm and preferably approximately 5 mm. Due to this measure, very fine yarns can also be detected.
  • the lengthening of the laser scanning light spot in the height direction is possible without problems because of the greater width of the retroreflector strip arranged according to the invention.
  • the retroreflector strip is attached to the hold-down device of the tufting machine, such an error cannot be recognized because the tensioned thread still slides over the reflector and is recognized by the laser beam as being present.
  • the thread coming from above is compressed by the knot in the eye of the needle and thus lies irregularly in front of the retroreflector strips arranged according to the invention above the eye of the needle. Flawless and fast error detection is possible here too.
  • the needle bar 14 carrying the needles 13 of the tufting machine is shown in the uppermost position of the needle stroke, so that the course of the threads 17 can be better illustrated.
  • the threads 17 are guided through bores 18 above the needle bar 14 and in front of it in the manner shown in FIGS. 1 and 2 obliquely down to the needle eyes of the needles 13, from where they extend into the carrier material 19 of the tufted goods.
  • the needle bar 14 is moved downward, the needles 13 with the threads 17 guided by them piercing the carrier material.
  • the position of the thread 17 in front of the needle bar 14 does not change significantly.
  • the holes 20 are designated by means of which the needle bars are fastened to suitable lifting members within the tufting machine.
  • a laser beam scanning device 21 As described for example in DE-OS 33 31 772, generates a vertically extending scanning light beam which carries out a rapid scanning movement perpendicular to the plane of the drawing in FIG. 1.
  • several such laser beam scanning devices 21 are arranged side by side across the width of the tufting machine.
  • the laser beam 23 is deflected in the horizontal direction via a deflecting mirror 22 and directed onto the needle bar 14, which is covered with a retroreflector strip 11 in its lower half.
  • a laser beam scanning device is preferably used, as described in DE-PS 34 47 869.
  • the scanning movement of the laser beam is brought about by a schematically indicated mirror wheel 27 which is acted upon by the laser 28 in a manner not shown.
  • the laser beam 23 hits the relatively wide retroreflector strip 11 approximately in a middle height range, so that even with certain misalignments of the laser beam the retroreflector strip 11 is still safely hit and there are no disturbances due to the falling of the Laser light beam 23 comes from the retroreflector strip 11.
  • the entire retroreflector strip 11 consists of individual partial strips of 10 to 20 cm in length. At the ends, these partial strips are cut off obliquely according to FIG. 2 and arranged so as to overlap, so that there are no interruptions in the retroreflective surface.
  • the laser beam scanning light spot 16 is elongated in the height direction. Its height is about 5 mm, while its width is only about 0.2 mm. In conjunction with the inclination of the bumps between adjacent retroreflector strips 11, the elongated configuration of the scanning light spot 16 means that no error signal occurs when the bumps are passed.
  • a periodic signal is generated in the evaluation electronics 25 because the laser scanning light spot 16 is alternately interrupted by the threads 17 and is reflected back by the areas of the reflector strip 11 between two threads 17. If a thread fails or there are other changes in the correct thread position, the periodic signal normally detected by the evaluation electronics 25 changes, and an error signal is generated which appears at the output 26.
  • the needle bar 14 is in the upper one Position of the laser beam 23 shown in the middle.
  • the laser beam 23 is arranged lower by the stroke of the needle bar 14, so it only assumes the position relative to the retroreflector strip 11 shown in the drawing when the needle bar 14 is in its lowest position. Then the threads 17 are best tensioned.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Textile Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Knitting Machines (AREA)
  • Filamentary Materials, Packages, And Safety Devices Therefor (AREA)

Claims (10)

1. Casse-fil optique pour machines à tufter comportant un dispositif de balayage à rayon laser qui produit un rayon laser effectuant un mouvement de balayage rapide, sans cesse renouvelé, perpendiculairement aux aiguilles de la rangée d'aiguilles, lequel rayon laser rencontre une bande de rétroréflecteur disposée derrière les fils traités par les aiguilles, lorsqu'il y a rupture du fil ou par passage à travers les fentes séparant les fils, est réfléchi et rencontre, dans le dispositif à balayage à rayon laser, un photodétecteur qui est raccordé à un dispositif électronique d'analyse, lequel délivre un signal de défaut, en cas de modification du signal périodique normal, caractérisé en ce que la bande de rétroréflecteur (11) est fixée au-dessus des chas (12) des aiguilles (13), sur la face frontale de la barre d'aiguilles (14).
2. Casse-fil optique selon la revendication 1, caractérisé en ce que la bande de rétroréflecteur (11) est disposée dans la moitié inférieure de la barre d'aiguilles (14).
3. Casse-fil optique selon la revendication 1 ou 2, caractérisé en ce que la bande de rétroréflecteur (11) a une largeur comprise entre 10 et 15 mm.
4. Casse-fil optique selon l'une des revendications ci-dessus, caractérisé en ce que la bande de rétroréflecteur (11) est constituée de plusieurs bandes de rétroréflecteur (11) disposées les unes derrière les autres, se recouvrant les unes les autres.
5. Casse-fil optique selon la revendication 4, caractérisé en ce que les extrémités des bandes de rétroréflecteur successives sont découpées obliquement par rapport à la direction de l'aiguille, dans la zone de recouvrement (15).
6. Casse-fil optique selon la revendication 5, caractérisé en ce que l'angle formé par les bords d'extrémité des bandes de rétroréflecteur (11) adjacentes, par rapport à la direction de l'aiguille, est compris entre 20 et 30° au minimum et est égal à 45° au maximum.
7. Casse-fil optique selon l'une des revendications précédentes, caractérisé en ce que l'on utilise une tache lumineuse de balayage à laser (16), allongée dans la direction du fil.
8. Casse-fil optique selon la revendication 7, caractérisé en ce que la largeur de la tache lumineuse de balayage à laser (16) est environ égale à 0,2 mm.
9. Casse-fil optique selon la revendication 7 ou 8, caractérisé en ce que la hauteur de la tache lumineuse de balayage à laser (16) est comprise entre 3 et 7 mm, en particulier entre 4 et 6 mm et de préférence égale à 5 mm environ.
10. Casse-fil optique selon l'une des revendications précédentes, caractérisé en ce que le rayon laser (23) est disposé à une hauteur telle qu'il rencontre la bande de rétroréflecteur (11) en son milieu, lorsque la barre d'aiguille (14) se trouve dans sa position la plus basse, et en ce que le dispositif électronique d'analyse (25) n'autorise une mesure que dans cette position.
EP86115346A 1985-11-07 1986-11-05 Casse-fil optique pour la chaîne d'alimentation de machines à tufter Expired EP0221546B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3539536 1985-11-07
DE3539536A DE3539536C1 (de) 1985-11-07 1985-11-07 Optische Fadenrissueberwachungsvorrichtung fuer Tuftingmaschinen

Publications (2)

Publication Number Publication Date
EP0221546A1 EP0221546A1 (fr) 1987-05-13
EP0221546B1 true EP0221546B1 (fr) 1989-05-17

Family

ID=6285405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115346A Expired EP0221546B1 (fr) 1985-11-07 1986-11-05 Casse-fil optique pour la chaîne d'alimentation de machines à tufter

Country Status (4)

Country Link
US (1) US4691647A (fr)
EP (1) EP0221546B1 (fr)
JP (1) JPS62125063A (fr)
DE (2) DE3539536C1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3625963A1 (de) * 1986-07-31 1988-02-04 Union Special Gmbh Fadenwaechter fuer naehmaschinen
DE3772577D1 (de) * 1987-12-24 1991-10-02 Barco Automation Nv Einrichtung zum messen eines fadens.
US4841890A (en) * 1988-05-23 1989-06-27 Ssmc Inc. Thread break indicating device for sewing machines using a photo amplifier
US5130558A (en) * 1989-04-14 1992-07-14 Bell & Howell Company Skew detector for inserter
ES2122882B1 (es) * 1995-07-24 1999-09-16 Pinter Sa Dispositivo para control de la rotura de hilos muy finos en maquinas de hilatura y similares.
US7448991B2 (en) * 2002-11-14 2008-11-11 Philip Morris Usa Inc. Process and system for monitoring a continuous element being incorporated within a cigarette filter
US7204137B1 (en) * 2003-08-20 2007-04-17 Essex, Inc. Thread breakage detection systems and methods
US7038779B2 (en) * 2003-10-10 2006-05-02 Ethicon Inc. System and method for sensing variations in a strand
SE532556C2 (sv) * 2008-04-17 2010-02-23 Eltex Sweden Ab Övervakningsanordning

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL279098A (fr) * 1961-05-31
US3687095A (en) * 1970-07-01 1972-08-29 Wilbur Jackson Tufting machine stop motion embodying light beam and sensor with triggering circuit responding to yarn breaks
US4109594A (en) * 1977-06-30 1978-08-29 Abram N. Spanel Tufting machine malfunction detection device
DE3331772C2 (de) * 1983-05-11 1985-04-25 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Optische Fadenrißüberwachungsvorrichtung
DE3335656C2 (de) * 1983-09-30 1986-08-28 Protechna Herbst GmbH & Co KG, 8012 Ottobrunn Vorrichtung zur fotoelektrischen Überwachung einer Kettenwirkmaschine
EP0187292B1 (fr) * 1984-12-31 1988-09-21 Erwin Sick GmbH Optik-Elektronik Casse-fil optique pour machine à touffeter
DE8438309U1 (de) * 1984-12-31 1987-03-19 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Optische Fadenrißüberwachungsvorrichtung für Tuftingmaschinen

Also Published As

Publication number Publication date
EP0221546A1 (fr) 1987-05-13
JPS62125063A (ja) 1987-06-06
DE3539536C1 (de) 1987-06-19
DE3663375D1 (en) 1989-06-22
US4691647A (en) 1987-09-08

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