EP0670280A1 - Vorrichtung zum Messen der Fadenreserve und zum Anzeigen von Fadenbrüchen für Fadenliefervorrichtung an Textilmaschinen und Fadenliefervorrichtung mit einer solchen Vorrichtung - Google Patents

Vorrichtung zum Messen der Fadenreserve und zum Anzeigen von Fadenbrüchen für Fadenliefervorrichtung an Textilmaschinen und Fadenliefervorrichtung mit einer solchen Vorrichtung Download PDF

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Publication number
EP0670280A1
EP0670280A1 EP95101834A EP95101834A EP0670280A1 EP 0670280 A1 EP0670280 A1 EP 0670280A1 EP 95101834 A EP95101834 A EP 95101834A EP 95101834 A EP95101834 A EP 95101834A EP 0670280 A1 EP0670280 A1 EP 0670280A1
Authority
EP
European Patent Office
Prior art keywords
reed
reserve
weft
turns
drum
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
EP95101834A
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English (en)
French (fr)
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EP0670280B1 (de
Inventor
Pietro Zenoni
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.)
LGL Electronics SpA
Original Assignee
LGL Electronics SpA
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Filing date
Publication date
Application filed by LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP0670280A1 publication Critical patent/EP0670280A1/de
Application granted granted Critical
Publication of EP0670280B1 publication Critical patent/EP0670280B1/de
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
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/367—Monitoring yarn quantity on the drum
    • 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
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means

Definitions

  • the present invention relates to a device for measuring the reserve of weft and for indicating weft breakage in weft feeders for looms and textile machines in general, and to a weft feeder which includes said device.
  • weft feeders are devices provided with a fixed drum on which a windmilling arm winds multiple turns of thread that constitute a reserve of weft.
  • the turns unwind from the drum when requested by the loom or textile machine, and before the reserve is depleted, the rotating arm winds more turns so as to constantly feed the weft reserve; a series of undulating rods causes the axial advancement of the fed turns from the base to the tip of the drum of the feeder.
  • a detection device which is sensitive to the presence of the reserve turns, activates the rotating arm when the number of said turns of the reserve decreases below a preset limit.
  • Optical devices in turn have the severe drawback that they are particularly sensitive to the presence of foreign matter, dust, and the like, and that they are also highly sensitive to the nature and color of the thread being used, since the light reflection index depends on these factors; said devices are also equally sensitive to the type and intensity of the ambient lighting.
  • control circuits associated with detection devices is more complicated and more prone to false indications.
  • a principal aim of the present invention is essentially to eliminate the above described drawbacks of known types of mechanical and optical detection devices and within the scope of this general aim has the following important and particular objects:
  • the invention is based on the concept of measuring the variable elastic deformation of a first reed which is subjected to the force applied by a variable number of turns of the reserve and of correlating this deformation to the constant elastic deformation of a second reed which is subjected to the force applied by a constant number of turns which is equal to the reserve depletion threshold, in order to obtain a value that corresponds to the shift of the point of application of the resultant of the forces that act on the first reed as the number of turns that act on said reed varies.
  • Both reeds are inserted at the base of the drum and lie parallel to the axis of the drum; the first reed is substantially as long as the maximum axial extension of the reserve of turns, and the second reed is substantially as long as the minimum axial extension of said reserve.
  • the resultant Fa of the forces that act on the first reed is applied at a point of the reed which is spaced from the respective insertion section by an extent La which is variable.
  • the resultant Fb of the forces that act on the second reed is applied at a point of the reed which is spaced from the respective insertion section by an extent Lb which is constant.
  • the reference numeral 10 generally designates a weft feeder of the type which comprises a fixed base 11 and a fixed drum 12 on which a windmilling hollow arm 13, associated with an equally hollow drive shaft 14, winds multiple turns of thread f that unwinds from a spool, not shown; said turns constitute a weft reserve RT.
  • the thread unwinds from the drum, reducing the reserve RT until a preset minimum value RT m is reached; once this value has been reached, or before it is reached, the measurement and control device, generally designated by the reference numeral 15, activates the arm 13 to wind additional turns on the drum and restore the maximum reserve RT M .
  • a system of undulating rods 16 moves the turns of thread from the base to the tip of the drum 12 until the reserve RT is completed.
  • the drum 12 is supported, by means of a supporting plate 12a, by a support 17 which is fixed and rigidly coupled to the base 11 by pairs of oppositely arranged magnets 19 which are located, according to a known arrangement, on the support 17 and on a fixed disk 20 which is rigidly coupled to the base 11; the support 17 is freely rotatably mounted, with the interposition of bearings 21, on an extension of the drive shaft 14.
  • the device 15 for measuring and controlling the reserve of weft RT comprises a first reed A and a second reed B a respective end whereof is inserted in the plate 12a of the drum.
  • the reeds A and B lie parallel to the drum 12 and along its outer surface, passing through corresponding openings 22-23 provided at the base of the drum 12.
  • the length T of the reed A is at least equal to, and preferably greater than, the maximum axial extension of the reserve RT M of turns on the drum 12; the length t of the reed B is at least equal to, and preferably slightly greater than, the minimum axial extension RT m of the reserve of turns on the drum 12 (figure 2).
  • Both reeds A and B are preferably made of steel plate, have the same elasticity modulus and the same rigidity, and are subjected to the force produced by the turns of thread of the reserve which are wound on them.
  • the force applied by the turns on the reed A varies according to the variations of the reserve of thread RT wound on the drum 12 and decreases as said reserve decreases; the force applied by the turns of thread on the reed B is constant, since the number of turns -- equal to the minimum reserve -- that act on said reed is constant.
  • the resultant Fa of the forces that act on the reed A is applied at a point P of the reed which is spaced by an extent La from the insertion section of said reed; the length of the portion La is variable in a substantially linear manner with respect to the value of the resultant Fa.
  • the resultant Fb of the forces that act on the reed B (which lies at right angles to the reed but is shown parallel thereto due to graphical requirements) is applied at a point p which is spaced by an extent Lb from the insertion section of said reed; the extent Lb is constant, like the value of the resultant Fb.
  • Respective pairs of strain gauges 30 and 31 are applied at the insertion section of each reed, are connected according to respective known bridge arrangements PS A -PS B (figure 4), and are supplied by a voltage Vcc; their outputs are connected to corresponding operational amplifiers AMP A -AMP B which provide in output signals which are proportional to the resultant Fa and to the resultant Fb respectively.
  • the processing unit UP comprises: an input A/D converter 32, which is operatively connected to the output of the operational amplifiers AMP A -AMP B ; a timer T; a microprocessor ⁇ p which calculates expression (2); and an output D/A converter 33, which provides an analog signal S that is equal to the measurement of the reserve of weft that is present on the drum 12.
  • the advance startup of the arm 13 by making the advance time proportional to the beat rate of the loom, so as to take into account the response delays in order to avoid exceeding the minimum reserve residual.
  • condition Fb 0 occurs if the weft thread breaks, and in this case the processing unit UP issues a stop signal SA for the entire loom-feeder assembly.
  • the operational amplifiers AMP A -AMP B are located on board the supporting plate 12a of the drum 12. Due to the presence of the thread f in the region between the base and the tip of the drum 12, the cables c1-c2 that connect the output of said amplifiers to the processing unit UP, which is generally installed externally with respect to the feeder 10, and the cable AL that supplies the Vcc to the amplifiers and to the strain gauge bridges PS A and PS B , cannot be transferred outside the drum 12, which is rigidly coupled to the plate 12a.
  • the power for supplying the strain gauge bridges and the amplifiers can be transferred electromagnetically in a per se known manner, by means of a transformer whose primary winding is located outside the drum and whose secondary winding is located inside said drum, whereas the data present at the output of the operational amplifiers is transmitted to the control system, located outside the drum 12, by means of optical emitters which are arranged inside the drum and by means of receiving phototransistors which are located outside said drum.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP95101834A 1994-02-15 1995-02-10 Vorrichtung zum Messen der Fadenreserve und zum Anzeigen von Fadenbrüchen für Fadenliefervorrichtung an Textilmaschinen und Fadenliefervorrichtung mit einer solchen Vorrichtung Expired - Lifetime EP0670280B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO940081 1994-02-15
IT94TO000081A IT1267379B1 (it) 1994-02-15 1994-02-15 Dispositivo per la misura della riserva di trama e la segnalazione della rottura di trama su apparecchi alimentatori di trama per

Publications (2)

Publication Number Publication Date
EP0670280A1 true EP0670280A1 (de) 1995-09-06
EP0670280B1 EP0670280B1 (de) 1999-06-09

Family

ID=11412136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95101834A Expired - Lifetime EP0670280B1 (de) 1994-02-15 1995-02-10 Vorrichtung zum Messen der Fadenreserve und zum Anzeigen von Fadenbrüchen für Fadenliefervorrichtung an Textilmaschinen und Fadenliefervorrichtung mit einer solchen Vorrichtung

Country Status (3)

Country Link
EP (1) EP0670280B1 (de)
DE (1) DE69510110T2 (de)
IT (1) IT1267379B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1928040A1 (de) * 1969-06-02 1970-12-10 Karl Tannert Jun Fadenzubringer mit ortsfestem Wickelkoerper
EP0171516A2 (de) * 1984-08-16 1986-02-19 Aktiebolaget Iro Fadenspeicher- und -liefervorrichtung
EP0464444A1 (de) * 1990-06-29 1992-01-08 SOBREVIN Société de brevets industriels-Etablissement Fadenliefervorrichtung
DE4139583A1 (de) * 1990-12-21 1992-07-02 Ichikawa Iron Works Co Kettfadenzufuehrung fuer webmaschinen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1928040A1 (de) * 1969-06-02 1970-12-10 Karl Tannert Jun Fadenzubringer mit ortsfestem Wickelkoerper
EP0171516A2 (de) * 1984-08-16 1986-02-19 Aktiebolaget Iro Fadenspeicher- und -liefervorrichtung
EP0464444A1 (de) * 1990-06-29 1992-01-08 SOBREVIN Société de brevets industriels-Etablissement Fadenliefervorrichtung
DE4139583A1 (de) * 1990-12-21 1992-07-02 Ichikawa Iron Works Co Kettfadenzufuehrung fuer webmaschinen

Also Published As

Publication number Publication date
ITTO940081A1 (it) 1995-08-15
ITTO940081A0 (it) 1994-02-15
DE69510110T2 (de) 2000-01-20
IT1267379B1 (it) 1997-02-05
DE69510110D1 (de) 1999-07-15
EP0670280B1 (de) 1999-06-09

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