EP2025783A1 - 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
EP2025783A1
EP2025783A1 EP07016066A EP07016066A EP2025783A1 EP 2025783 A1 EP2025783 A1 EP 2025783A1 EP 07016066 A EP07016066 A EP 07016066A EP 07016066 A EP07016066 A EP 07016066A EP 2025783 A1 EP2025783 A1 EP 2025783A1
Authority
EP
European Patent Office
Prior art keywords
thread
weft
weft thread
weaving machine
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.)
Granted
Application number
EP07016066A
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German (de)
English (en)
Other versions
EP2025783B1 (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 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
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 and a method for weft thread monitoring in a loom according to the preamble of the independent claims.
  • 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, especially in the processing of relatively thick yarns, and have the task of keeping the weft thread taut.
  • the senor is a triboelectric sensor.
  • the Use of optical, capacitive, piezoelectric or inductive sensors is also conceivable that the Use of optical, capacitive, piezoelectric or inductive sensors.
  • 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 triboelectric sensor, which consists essentially of a conductor portion 13 which is disposed on one of the arms 11, 12, in the present embodiment on the lower, more massive arm 11.
  • the upper end of the conductor portion 13 is located on the surface of the Thread clamp 10 in the area 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 monitoring device with 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.
  • Light guide 19 is disposed on the upper arm 12 and guides the light into the gap between the arms 11, 12.
  • a second light guide 20 is arranged, which the light receives 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 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-monitoring device with capacitive sensor. This consists of two electrodes 24, 25 which are arranged on opposite sides of the gap between the arms 11, 12. Preferably, at least one of the electrodes is covered by an insulating cover layer 26, so that direct electrical contact between the electrodes is avoided.
  • 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 has, for example, a coil 30 which is arranged in the arm 11 is, and which generates a magnetic field, which penetrates the other arm 12. If the other arm 12 is made of metal, then 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.
  • a coil 30 which is arranged in the arm 11 is, and which generates a magnetic field, which penetrates the other arm 12. If the other arm 12 is made of metal, then 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.
  • measuring methods which are based on the fact that the electrical resistance between the arms 11, 12 changes during insertion of the weft thread. For this purpose, it can be measured what kind of current flows between the arms.
  • the change in the contact force is detected, for example, with a piezoelectric sensor.
  • a piezoelectric sensor 31 is shown schematically in FIG Fig. 2 drawn and carries one of the two arms 11, 12th
  • FIG. 7 Another embodiment of the device is in Fig. 7 shown.
  • This is a 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.
  • a light source 18, a partially transparent mirror 22 and a light detector 21 are provided are.
  • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
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 true EP2025783A1 (fr) 2009-02-18
EP2025783B1 EP2025783B1 (fr) 2013-06-12

Family

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

Country Status (1)

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EP (1) EP2025783B1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2312709A1 (de) * 1972-03-17 1973-09-27 Vnii Ljochkowo I Textilnowo Ma Vorrichtung zum festhalten des schussfadenendes an schuetzenlosen webmaschinen
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
DE3921033A1 (de) * 1988-06-27 1989-12-28 Tagawa Kikai Co Vorrichtung zum erfassen des schussfadenendes bei schuetzenlosen webautomaten
US5083584A (en) * 1989-04-07 1992-01-28 Gebruder Loepfe Ag. Weft yarn detector for a shuttleless weaving loom

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2312709A1 (de) * 1972-03-17 1973-09-27 Vnii Ljochkowo I Textilnowo Ma Vorrichtung zum festhalten des schussfadenendes an schuetzenlosen webmaschinen
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
DE3921033A1 (de) * 1988-06-27 1989-12-28 Tagawa Kikai Co Vorrichtung zum erfassen des schussfadenendes bei schuetzenlosen webautomaten
US5083584A (en) * 1989-04-07 1992-01-28 Gebruder Loepfe Ag. Weft yarn detector for a shuttleless weaving loom

Also Published As

Publication number Publication date
EP2025783B1 (fr) 2013-06-12

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