EP1445363A2 - Anordnung des Streichbaums in einer Webmaschine - Google Patents

Anordnung des Streichbaums in einer Webmaschine Download PDF

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Publication number
EP1445363A2
EP1445363A2 EP04100319A EP04100319A EP1445363A2 EP 1445363 A2 EP1445363 A2 EP 1445363A2 EP 04100319 A EP04100319 A EP 04100319A EP 04100319 A EP04100319 A EP 04100319A EP 1445363 A2 EP1445363 A2 EP 1445363A2
Authority
EP
European Patent Office
Prior art keywords
back rest
arrangement
warp
load cell
loom
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
EP04100319A
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English (en)
French (fr)
Other versions
EP1445363A3 (de
EP1445363B1 (de
Inventor
Giuseppe Casarotto
Maurizio Belingheri
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.)
Promatech SpA
Original Assignee
Promatech SpA
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Filing date
Publication date
Application filed by Promatech SpA filed Critical Promatech SpA
Publication of EP1445363A2 publication Critical patent/EP1445363A2/de
Publication of EP1445363A3 publication Critical patent/EP1445363A3/de
Application granted granted Critical
Publication of EP1445363B1 publication Critical patent/EP1445363B1/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
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/22—Back rests; Lease rods; Brest beams
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D49/00—Details or constructional features not specially adapted for looms of a particular type
    • D03D49/04—Control of the tension in warp or cloth
    • D03D49/12—Controlling warp tension by means other than let-off mechanisms

Definitions

  • the present invention relates to a back rest for a weaving loom, specifically to an improved back rest arrangement comprising a load cell for reading the average tension of the warp yarns.
  • the warp yarns must be guided between the warp beam and the weaving plane. This is normally accomplished through a back rest, which extends along the whole width of the loom, by means of which the warp yarns are deviated from a substantially vertical plane - defined by the array of warp yarns coming from the warp beam located in the lower part of the loom - to a substantially horizontal plane - which corresponds to the weaving plane comfortably accessible by the operator and along which the warp stop motion device (fig. 1) is located.
  • the healds force the warp yarns to perform a reciprocating movement opening and closing the shed to allow the weft yarn to be inserted, a corresponding tensioning and loosening action is performed on the warp yarns themselves. It must be possible to simultaneously release or draw again these yarns to prevent them from being overtensed or from remaining excessively loose, respectively, which would affect the quality of the operated fabric as well as the reliability of the loom due to the possible breaking of the yarns.
  • the back rest is capable of performing an oscillating movement to follow the movement of the warp yarns and is indeed also called "warp thread tensioning device".
  • the back rest is displaced from its balance position by the tension applied thereto by the warp yarns, against the force of a series of pre-loaded springs acting through suitable leverages.
  • An example of a support assembly of a back rest is shown in figg. 4A and 4B, which are partial perspective views of the left end (as seen from the loom operator) of a prior art back rest seen from inside and outside the loom, respectively.
  • the support frame of the back rest is typically further equipped with a displacement transducer, by means of which it is possible to detect the displacement of the back rest and thus to have a signal substantially proportional to the average tension existing in the warp yarns.
  • a design according to the prior art provides to mount a back rest C onto a main bracket B1 of an articulated linkage B1-B2-B3 working against a coil spring A; furthermore, a proximity sensor S is adjacent to the end of the shock absorber A, which is engaged on a butterfly-shaped elastic element F.
  • the signal obtained from the proximity sensor - which is an index of the displacement of the end of the shock absorber A, and hence of the tension applied by the warp yarns to the back rest C - is then feedback-inserted into an adjustment loop which suitably intervenes on the rotation speeds of the let-off motion cylinder and of the fabric-tensioning roller to achieve the desired tension.
  • T warp is the warp tension (N)
  • W 1 is the angular velocity of the fabric-tensioning roller (rad/s)
  • W 2 is the angular velocity of the let-off motion cylinder (rad/s)
  • r 1 is the radius of the fabric-tensioning roller (mm)
  • r 2 is the radius of the let-off motion cylinder (time-dependent, since the yarn is unwinding, mm)
  • Ks yarn is the rigidity per length unit of the individual warp yarn (N)
  • L warp is the total geometric length of the chain (mm).
  • the intervention times of the let-off motion cylinder are such that a significant intervention within the individual loom cycle is prevented: this means that it is not so important to detect and act on the instant value of the tension, but rather on the average thereof.
  • the prior art system suffers from some serious drawbacks.
  • the butterfly spring F specifically employed to obtain the proximity reading, is prone to fatigue failure and reproducibility of its rigidity (elastic modulus) can only rarely be obtained within production batches.
  • reading of the sensor is performed downstream of the kinematic chain of the various rods B1, B2 and B3, which introduces disturbances in terms of friction and therefore in terms of the undesired delays and changes in the reading of the tension value.
  • fig. 1 is a diagrammatic elevation side view of a configuration typical of a weaving loom
  • fig. 2 is a diagram showing the time-dependent warp tension in different weaving areas
  • fig. 3 is a diagram showing the average tension in the warp yarns versus the transversal position along the loom width;
  • figg. 4A and 4B are partial perspective views, from the inside and the outside, respectively, of the left end of an arrangement of the back rest according to the prior art;
  • fig. 5 is an exemplary functional diagram of a feedback loop including the device of the invention.
  • 6A, 6B and 6C are a top plan view, an elevation side view, and an elevation front view, respectively, of a load cell device according to the invention
  • fig. 7 is a top plan view of an end of the arrangement according to the invention.
  • fig. 8 is an elevation side view of the end of fig. 7;
  • fig. 9 is a cross-section view according to the line IX-IX in fig. 8;
  • fig. 10 is an elevation side view from inside the loom, of the left suspension system onto which the arrangement of the invention is mounted;
  • fig. 11 is an elevation side view of a left shoulder of the loom onto which the arrangement of the invention is mounted.
  • a back rest C is mounted at each end thereof, in a manner known per se, onto supporting hub devices C 1 .
  • each hub device C 1 has a fastening flange C 2 by means of which it is fixed, through fastening screws V 1 and V 2 , to the force-applying foot 1 of a torsional load cell.
  • the force-applying foot 1 of the cell is substantially T-shaped: on the two arms 1a and 1b are obtained holes 1a' and 1b' in which screws V 1 and V 2 shall engage to fix the fastening flange C 2 .
  • a cylindrical body 2 projects perpendicularly, for example having a diameter of 45 mm.
  • a relief groove 3 is provided, into which measuring strain-gauges are mounted.
  • the groove 3 has the advantage of representing a "protected" physical area into which the strain-gauges can be placed and, above all, of allowing to best exploit the deformability range of the strain-gauges themselves (the load conditions being equal, a stronger signal is obtained), however without compromising fatigue resistance of the same and of the load cell material.
  • such groove has a reduced diameter, for example 30 mm.
  • the strain-gauges have a full bridge connection to each other, which in addition to the higher signal/strain ratio, allows to compensate the undesired effects due to bending, traction and compression.
  • the load cell according to the invention has been implemented through strain-gauges MM of the type J2A-06S11K350 (specific for transducers, and inexpensive) glued with cyanoacrylate adhesives, and balanced within a range of ⁇ 40 ⁇ V and powered by a 10-Volt supply.
  • a tightening sleeve 4 is fixed, consisting of an anular tightening portion 4a - providing two jaws, mutually interlocking by means of a screw element 5 - and a thinner enveloping portion 4b, which preferably extends at least along the whole length of the cylindrical body 2.
  • a flap or flange 6 from which an abutting pin projects perpendicularly, which is useful during the assembling step.
  • a supporting bracket 8 capable of connecting the whole arrangement of the back rest to a suitable supporting kinetic mechanism of the loom (fig. 10).
  • the tension of the warp yarns T (fig. 11) is applied onto the back rest C, then reaches the supporting structure of the weaving loom through the load cell, which is capable of reading the value thereof and of translating it into an electric signal.
  • the axis of the back rest C is offset in respect of the central axis of the cylindrical body 2 of the load cell, respectively marked by projections O and O' in fig. 8.
  • the electric signal coming from the torsional load cell is then fed and processed within a feedback loop capable of intervening correctly on the chain controls, in particular on the motors of the let-off motion cylinder and of the fabric-tensioning roller.
  • An exemplary circuit of this type is shown in fig. 5.
  • the signal coming from the load cell is fed into an amplifier (A) having the function of translating the signal into a range of values expected by a voltage-to-frequency converter.
  • A an amplifier having the function of translating the signal into a range of values expected by a voltage-to-frequency converter.
  • the amplifier due to the inevitable presence of a resistor-capacitor-type circuit, has an own time constant, which therefore already causes a first damping of the input signal.
  • the signal is then processed by a voltage-to-frequency converter (V/F) which translates the analogical tension signal, coming from the amplifier, into a frequency modulated signal: the output in Hertz is proportional to the input in Volts.
  • V/F voltage-to-frequency converter
  • the frequency signal is then translated into a digital piece of information within a suitable microprocessor (MP): over a certain time interval the periods of the signal coming from the V/F converter are counted.
  • MP microprocessor
  • the sampling of the signal is not continuous, but repeated at constant time intervals. Since it is not dependent on the cycle period of the machine, it is called asynchronous: for example, it occurs every 10 ms, which is a sufficiently short period to prevent the signal from being misinterpreted.
  • an "offset" for example the tare of the back rest
  • the sign can be inverted, if necessary.
  • the signal t coming from the RTC is compared against a preset reference voltage: the error obtained is examined both in its proportional part - used for major changes (for example at the starting of the loom) - and in its integral part - used to compensate the oscillations about the preset reference value; each of these two parts has an own associated coefficient of intervention: clearly, the value assigned to these parameters is important for the correct operation of the system.
  • control unit is used to adjust warp beam drive and thus the tension of the warp yarns on the back rest, which provides a certain reaction in the load cell, which in turn produces a rectifying signal to be feedback-fed into the loop and so on, until convergence towards an optimal value is reached.
  • fictitious warp-beam-releasing radius also called transmission ratio, i.e. the ratio of loom cycles to warp beam revolutions
  • the Applicant was able to practically obtain an arrangement according to the invention which, by means of a single cell, made it possible to cover the whole range of possible tensions, from the lowest ones to the highest ones, estimated to be - in terms of the torsional moment on the cell - 20 ⁇ 770 Nm plus the torsional moment due to the mass of the back rest which, depending on the length of the back rest, is 24 ⁇ 116 Nm.
  • the load cell always used and transferred a signal of a few mVolts correctly, which was subsequently suitably conditioned and amplified in the circuit described above. Also, detection reproducibility was excellent, with maximum deviation in the region of 1%.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Woven Fabrics (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
EP04100319A 2003-02-04 2004-01-29 Anordnung des Streichbaums in einer Webmaschine Expired - Lifetime EP1445363B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000182A ITMI20030182A1 (it) 2003-02-04 2003-02-04 Disposizione di portafili perfezionata per un telaio tessile
ITMI20030182 2003-02-04

Publications (3)

Publication Number Publication Date
EP1445363A2 true EP1445363A2 (de) 2004-08-11
EP1445363A3 EP1445363A3 (de) 2005-01-12
EP1445363B1 EP1445363B1 (de) 2008-02-27

Family

ID=32652459

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04100319A Expired - Lifetime EP1445363B1 (de) 2003-02-04 2004-01-29 Anordnung des Streichbaums in einer Webmaschine

Country Status (5)

Country Link
EP (1) EP1445363B1 (de)
AT (1) ATE387526T1 (de)
DE (1) DE602004012004T2 (de)
ES (1) ES2303022T3 (de)
IT (1) ITMI20030182A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101070658B (zh) * 2007-04-29 2010-11-17 江苏万工科技集团有限公司 喷气织机的打纬力矩自动调节装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110205738A (zh) * 2019-07-16 2019-09-06 际华三五四二纺织有限公司 一种喷气织机后梁

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3528364A1 (de) * 1985-08-07 1987-02-19 Helmut Erb Elektr Messtechnik Reaktionsdrehmomentaufnehmer und verfahren zu seiner messbereichsanpassung
CH681156A5 (de) * 1989-05-02 1993-01-29 Sulzer Ag
JPH0551845A (ja) * 1991-08-12 1993-03-02 Toyota Autom Loom Works Ltd 織機における経糸張力検出方法及び装置
JP2534202Y2 (ja) * 1991-12-13 1997-04-30 株式会社豊田自動織機製作所 織機における経糸張力検出装置
IT1304112B1 (it) * 1998-12-17 2001-03-07 Vamatex Nuova Spa Portafili a sospensione progressiva per telaio di tessitura
WO2002052082A1 (de) * 2000-12-27 2002-07-04 Textilma Ag Vorrichtung zur überwachten zuführung von kettfäden zu einer web- oder ketten-wirkmaschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101070658B (zh) * 2007-04-29 2010-11-17 江苏万工科技集团有限公司 喷气织机的打纬力矩自动调节装置

Also Published As

Publication number Publication date
DE602004012004T2 (de) 2009-02-26
ITMI20030182A1 (it) 2004-08-05
EP1445363A3 (de) 2005-01-12
DE602004012004D1 (de) 2008-04-10
ATE387526T1 (de) 2008-03-15
ES2303022T3 (es) 2008-08-01
EP1445363B1 (de) 2008-02-27

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