EP2025783B1 - Surveillance de fils de trame sur le pince-fil dans une machine à tisser - Google Patents

Surveillance de fils de trame sur le pince-fil dans une machine à tisser Download PDF

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Publication number
EP2025783B1
EP2025783B1 EP20070016066 EP07016066A EP2025783B1 EP 2025783 B1 EP2025783 B1 EP 2025783B1 EP 20070016066 EP20070016066 EP 20070016066 EP 07016066 A EP07016066 A EP 07016066A EP 2025783 B1 EP2025783 B1 EP 2025783B1
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EP
European Patent Office
Prior art keywords
thread
weft
clamp
arms
sensor
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.)
Active
Application number
EP20070016066
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German (de)
English (en)
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EP2025783A1 (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
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Publication date
Application filed by Loepfe AG Gebrueder filed Critical Loepfe AG Gebrueder
Priority to EP20070016066 priority Critical patent/EP2025783B1/fr
Publication of EP2025783A1 publication Critical patent/EP2025783A1/fr
Application granted granted Critical
Publication of EP2025783B1 publication Critical patent/EP2025783B1/fr
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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
    • 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
    • D03D47/40—Forming selvedges

Definitions

  • the invention relates to a loom for weft thread monitoring in a loom according to the preamble of claim 1.
  • the senor is arranged on the stationary thread clamp, which is located in the region of the sheet stop of the goods.
  • Such stationary thread clamps are provided in some types of equipment, in particular in the processing of relatively thick yarns, and have the task of keeping the weft thread taut.
  • the sensor is an inductive sensor.
  • Fig. 1 shows an area of the weft arrival side of a projectile loom. Visible is the sheet 1 with a plurality of leaf rods 2 and a Randfadenklemme 3 for the weft thread 4. Schematically represented is the tray 5 and the already woven goods 6 with the sheet stop. 7
  • the edge thread clamp 3 moves synchronously to the sheet 1. It stops the inserted weft thread 4 fixed his end and leads him together with the sheet 1 against the stop 7.
  • FIG. 1 Schematically drawn in Fig. 1 is also a frame 8 of the weaving machine, which is stationary and on which the other components are fixed or movable.
  • At least one stationary thread clamp 10 is also provided in the weaving machine. It is located laterally next to the product 6 at the level of the stop 7. It is fixed to the frame 8.
  • the thread clamp 10 is used to temporarily hold the registered and brought from the sheet 1 and the edge thread clamp 3 to stop 7 weft. She keeps the weft taut in this area. As a rule, she keeps several weft threads at the same time.
  • stationary thread clamps 10 are arranged on both sides of the product, so that the weft thread can be kept taut between them.
  • the weft monitoring device described below can be arranged on one or both of these thread clamps.
  • the position of the second thread clamp is in Fig. 1 indicated by the reference numeral 10 '.
  • the use of two thread clamps with the weft thread monitoring device described below has the advantage that additional types of defects can be detected (eg breakage of the weft thread on the insertion side or jumping out of the entry side thread clamp) which can not be detected with only one weft thread monitoring device ,
  • a first embodiment of the thread clamp 10 is made Fig. 2 seen. It has two arms 11, 12, which are pressed against each other, so that they are able to pinch the weft thread 4 between them and able to hold. Preferably, they are resiliently urged against each other, ie by means of elastic forces.
  • at least one of the arms, namely, the upper arm 12, is elastic and is pressed under deformation against the other arm.
  • a weft yarn monitoring device is arranged on the thread clamp 10.
  • This has a (not claimed) triboelectric sensor, which consists essentially of a conductor section 13 which is arranged on one of the arms 11, 12, in the present embodiment on the lower, more massive arm 11.
  • the upper end of the conductor section 13 is located on the surface of the thread clamp 10 in the region between the arms 11, 12, so that it comes into contact with the guided through the thread clamp 10 weft and thus detects whether the weft thread between the arms 11, 12 has occurred.
  • electrical charges are transferred between the conductor section 13 and the weft thread, which generate a detectable charge shock.
  • a high-impedance electrical amplifier 15 is connected to the conductor section 13.
  • the conductor section 13 is preferably electrically isolated from the arm 11 by means of an insulator 14.
  • Fig. 2 seen that the two arms 11, 12 are mechanically connected to a common bracket 16, which, as in Fig. 1 shown schematically, is attached to the frame 8.
  • the described triboelectric detection of the weft thread has the advantage that it is relatively insensitive to contamination and allows a relatively reliable detection in the environment of a loom.
  • other measuring methods are also conceivable, some of which are described below.
  • Fig. 3 shows an embodiment of the weft yarn monitoring device with (not claimed) optical sensor, with the optical absorption, scattering and / or reflection can be detected on the weft.
  • this embodiment operates as a light barrier and has a light source 18 whose signal is coupled into a light guide 19 shown schematically.
  • Optical fiber 19 is disposed on the upper arm 12 and guides the light into the gap between the arms 11, 12.
  • a second optical fiber 20 is arranged, which receives the light and leads to an optical detector 21, whose signal is then amplified by the amplifier 15.
  • weft thread enters the region between the two light guides 19, 20, it interrupts the light path, which leads to a corresponding signal at the output of the amplifier 15.
  • Fig. 4 shows a further embodiment of the weft-monitoring device with (not claimed) optical sensor.
  • the optical sensor measures in reflection.
  • only one light guide 20 is provided, in which light is coupled from the light source 18, reflected in the region of the gap between the arms 11, 12 and fed back into the light guide 20 and then guided to the optical detector 21.
  • a partially transparent mirror or beam splitter 22 is provided.
  • Fig. 5 shows a weft yarn monitoring device with (not claimed) capacitive sensor.
  • This consists of two electrodes 24, 25 which are arranged on opposite sides of the gap between the arms 11, 12.
  • weft thread changes their distance and thus the capacitance between the electrodes.
  • the weft thread has a dielectric constant ⁇ unlike that of air, which also leads to a change in the electrical capacitance when the weft thread is between the electrodes 24, 25.
  • Fig. 6 shows an inductive sensor weft monitoring device. This one owns For example, a coil 30, which is arranged in the arm 11 and which generates a magnetic field, which penetrates the other arm 12. If the other arm 12 is made of metal, a movement of the other arm 12 causes an inductance change in the coil 30, which in turn can be detected by a suitable measuring electronics 28.
  • FIG. 7 Another embodiment of the device is in Fig. 7 shown.
  • This is a (not claimed) triboelectric sensor 13, 14, as in the embodiment according to Fig. 2 ,
  • the sensor is not disposed between the arms 11, 12, but at the entrance mouth 32 of the thread clamp 10.
  • This entrance mouth 32 is formed by a region in which the arms 11, 12 form two expanding guide surfaces which catch the incoming thread and between the arms 11, 12 lead.
  • This arrangement can be advantageous in practical operation since the sensor can be placed in a convex part of the surface of the clamp so that it is less prone to fouling.
  • Fig. 8 An example of an optical sensor is in Fig. 8 shown.
  • holes 34 are provided in the lower arm 11 of the clamp, in which a light source 18, a partially transparent mirror .22 and a light detector 21 are provided.
  • the operation of the arrangement essentially corresponds to that of Fig. 4 ,
  • the present weft yarn monitoring device is also suitable for retrofitting in weaving machines, e.g. together with the subsequent installation of stationary thread clamps 10.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)

Claims (7)

  1. Machine à tisser avec un dispositif de surveillance du fil de trame (13-15, 18-22) pour détecter l'arrivée du fil de trame et arrangé du côté du produit (6) à tisser, la machine à tisser ayant au moins une pince de fil (10) arrangée à l'arrêt (7) du produit (6), le dispositif de surveillance du fil de trame (13-15, 18-22) ayant un capteur arrangé à la pince de fil (10), à l'aide duquel un fil de trame arrivant à la pince de fil (10) est détectable, caractérisé en ce que la pince de fil (10) a deux bras (11, 12) pressés l'un contre l'autre pour soutenir des fils de trame temporairement, et en ce que le capteur est un capteur inductif.
  2. Machine à tisser selon la revendication 1, le capteur étant une bobine (30) dans un des bras (11), qui génère un champs magnétique pénétrant l'autre bras (12), l'autre bras (12) étant de métal, et une électronique de mesure (28) étant prévue, à l'aide de laquelle un changement d'inductance dans la bobine (30) est détectable quand l'autre bras (12) est déplacé.
  3. Machine à tisser selon l'une des revendications précédentes, les deux bras (11, 12) étant pressés l'un contre l'autre de manière élastique, et particulièrement au moins un des bras étant élastique et étant pressé de manière déformante contre l'autre bras.
  4. Machine à tisser selon l'une des revendications précédentes, ayant une pince de fil (3) de bordure en plus de la pince de fil stationnaire (10), étant adaptée à soutenir et guider le fil de trame pendant son mouvement vers l'arrêt (7).
  5. Machine à tisser selon l'une des revendications précédentes, le capteur mesurant si le fil de trame a passé entre les bras (11, 12).
  6. Machine à tisser selon l'une des revendications 1 à 4, le capteur mesurant si le fil de trame est arrivé à une entrée (32) de la pince de fil.
  7. Machine à tisser selon l'une des revendications précédentes, avec deux pinces de fil (10, 10') sur des côtés opposés du produit, un dispositif de surveillance du fil de trame (13-15, 18-22) étant arrangé à chacune des pinces de fil.
EP20070016066 2007-08-16 2007-08-16 Surveillance de fils de trame sur le pince-fil dans une machine à tisser Active EP2025783B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20070016066 EP2025783B1 (fr) 2007-08-16 2007-08-16 Surveillance de fils de trame sur le pince-fil dans une machine à tisser

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20070016066 EP2025783B1 (fr) 2007-08-16 2007-08-16 Surveillance de fils de trame sur le pince-fil dans une machine à tisser

Publications (2)

Publication Number Publication Date
EP2025783A1 EP2025783A1 (fr) 2009-02-18
EP2025783B1 true EP2025783B1 (fr) 2013-06-12

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ID=38951348

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070016066 Active EP2025783B1 (fr) 2007-08-16 2007-08-16 Surveillance de fils de trame sur le pince-fil dans une machine à tisser

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU441828A1 (ru) * 1972-03-17 1976-05-25 Всесоюзный Научно-Исследовательский Институт Легкого И Текстильного Машиностроения Устройство дл удержани концов уточных нитей на бесчелночном ткацком станке
US3978893A (en) * 1974-09-26 1976-09-07 Enshu, Limited Apparatus for detecting success in weft insertion of shuttleless looms
US4498504A (en) * 1982-09-23 1985-02-12 Burlington Industries, Inc. Filling fringe waste reduction
US4976292A (en) * 1988-06-27 1990-12-11 Tagawa Kikai Co., Ltd. Weft end tensioning and detecting devices for shuttleless loom
CH681158A5 (fr) * 1989-04-07 1993-01-29 Loepfe Ag Geb

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EP2025783A1 (fr) 2009-02-18

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