EP1445364B1 - Métier à tisser avec plusieurs moteurs avec une installation électrique améliorée - Google Patents

Métier à tisser avec plusieurs moteurs avec une installation électrique améliorée Download PDF

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Publication number
EP1445364B1
EP1445364B1 EP03104560A EP03104560A EP1445364B1 EP 1445364 B1 EP1445364 B1 EP 1445364B1 EP 03104560 A EP03104560 A EP 03104560A EP 03104560 A EP03104560 A EP 03104560A EP 1445364 B1 EP1445364 B1 EP 1445364B1
Authority
EP
European Patent Office
Prior art keywords
power
loom
motor
weaving
weaving 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.)
Revoked
Application number
EP03104560A
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German (de)
English (en)
Other versions
EP1445364A2 (fr
EP1445364A3 (fr
Inventor
Corrado Volpi
Angelo Gallizioli
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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Publication date
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Application filed by Promatech SpA filed Critical Promatech SpA
Publication of EP1445364A2 publication Critical patent/EP1445364A2/fr
Publication of EP1445364A3 publication Critical patent/EP1445364A3/fr
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Publication of EP1445364B1 publication Critical patent/EP1445364B1/fr
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
    • D03D51/005—Independent drive motors

Definitions

  • the present invention relates to improvements to weaving looms equipped with a plurality of driving motors.
  • the driving devices typically the main electric motor of the loom and the motor of the dobby
  • the driving devices are subject to heavy working conditions, both in terms of the total power output, and of the variation frequency thereof.
  • the cyclical operation of the loom causes a fluctuating power absorption which, in certain conditions, can also bear a negative sign.
  • the power transferred from the motor to a weaving member varies cyclically, bearing a positive sign when the member accelerates (kinetic energy increases due to the power output of the motor), and a negative sign when the weaving member decelerates. In the latter condition the kinetic energy lost by the weaving member is transferred back to the motor.
  • a first solution consists in the provision of an adequate capacitance (in terms of capacitors) in the motor feeder section.
  • the accumulated energy is then recovered (by discharging the capacitors) when the system resumes functioning as a motor.
  • a second solution which can therefore be employed in association with the one just described, consists in the provision of a so-called "braking resistance", i.e. a resistance circuit which is able to dissipate electric energy into heat and to intervene as soon as the capacitors reach a saturation threshold. Since the phenomenon is by its nature irreversible, it is of course inefficient.
  • a third, rather costly, solution provides the use of a special feeder section, which is able to transform the energy accumulated in capacitor power into regenerated power, which is made available to the supply mains (so-called "regenerative feeders").
  • This system despite allowing satisfactory energy recovery, is little used due to its cost and susceptibility to faults.
  • the average power consumed by a certain load with a time-fluctuating power absorption sign is quite low if compared with the nominal power input necessary instead to cope with peak power absorption (in terms of absolute value). It is hence necessary to employ a larger-than-required rated power (with the resulting cost drawbacks), compared to that which could be used if it was possible to recover effectively the power released by the system in negative working conditions.
  • the operating frequency is high (up to 800-1000 strokes per minute);
  • DE-A-10061717 discloses an arrangment in a weaving loom so as to compensate fluctuations of the rpm of the drive of the weaving and shedding machine. It is further disclosed to connect with each other the drive circuits of the weaving and shedding machines to obtain a transfer of electric energy.
  • fig. 1 is a diagrammatic view showing a power feeding arrangement according to the known art
  • fig. 2 is a diagrammatic view showing a power feeding arrangement according to the invention.
  • fig. 3 is a diagram showing the torque curves against time of the different members of a gripper weaving loom.
  • a generic weaving loom comprises a plurality of motors, to simultaneously and independently control multiple consuming appliances, i.e. different weaving members.
  • the weaving loom is equipped with at least a double motor, i.e. a first motor for the main weaving members (for example the sley for the air jet loom; sley and grippers for the gripper loom), and a second motor for the weaving machine, both mounted for example with a direct drive.
  • a first motor for the main weaving members for example the sley for the air jet loom; sley and grippers for the gripper loom
  • a second motor for the weaving machine both mounted for example with a direct drive.
  • the first motor is designed to "track" (positionwise or speedwise) the second one, which should normally be more powerful.
  • the power feeding arrangement of this loom provided, as shown in fig. 1, a drive for each motor, each consisting of two cascade-connected main blocks, the former called feeder (or feeding bus) and the latter converter.
  • the feeder generally consists of a rectifier - used to convert the alternating voltage coming from the supply mains into a pulsating rectified voltage - and of capacitors, which allow to store energy both to level out the voltage to the converter, and to recover part of the energy in the singular working conditions described above.
  • the converter instead, acts onto the rectified voltage, through suitable electronic circuits and power switches, so as to control the driving motor in the desired way (speed, torque, etc.).
  • the drives of the various driving motors share a common single feeding bus section.
  • the single feeding bus is more powerful than the one employed according to the known art for each single motor, but - advantageously - its power is smaller than the sum of the bus power values theoretically necessary for the individual consuming appliances.
  • the power absorbed by and returned from the various consuming appliances can be redistributed within the single shared feeding bus, obtaining an overall higher energy efficiency of the loom.
  • FIG. 3 A clear aspect of the advantages that can be achieved according to the invention is shown in fig. 3, which relates, by mere way of example, to a gripper loom.
  • the absolute value of the power input and output of the feeder (solid-line curve) - for instance in the range between 0 and t 1 - is smaller than that of the power which would be delivered by the feeder according to the known art in order to move, with independent motors, the loom and the dobby, since the respective contributions have an opposite sign, resulting in the power demanded by the loom being partially supplied by the dobby.
  • the system according to the invention can be employed in conjunction with a well-known capacitor system, which advantageously will have a smaller workload compared to the condition lacking a common shared feeding bus. It is instead possible to do completely without the braking resistance (dissipator) obtaining a greater efficiency.

Landscapes

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

Claims (2)

  1. Métier à tisser du type comprenant une pluralité de moteurs électriques fonctionnant simultanément et indépendamment, les entraînements desdits moteurs électriques comprenant deux blocs connectés en cascade, un premier bloc étant un bus d'alimentation, constitué d'un redresseur et d'un condensateur, et un deuxième bloc étant un convertisseur, caractérisé en ce que lesdits entraînements comportent une unique section de bus d'alimentation partagée.
  2. Métier à tisser selon la revendication 1), dans lequel lesdits moteurs électriques sont au moins le moteur électrique principal du métier et le moteur électrique de la ratière.
EP03104560A 2003-02-04 2003-12-05 Métier à tisser avec plusieurs moteurs avec une installation électrique améliorée Revoked EP1445364B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000183A ITMI20030183A1 (it) 2003-02-04 2003-02-04 Telaio tessile a motorizzazione multipla con armatura elettrica perfezionata
ITMI20030183 2003-02-04

Publications (3)

Publication Number Publication Date
EP1445364A2 EP1445364A2 (fr) 2004-08-11
EP1445364A3 EP1445364A3 (fr) 2005-01-19
EP1445364B1 true EP1445364B1 (fr) 2008-01-23

Family

ID=32652460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03104560A Revoked EP1445364B1 (fr) 2003-02-04 2003-12-05 Métier à tisser avec plusieurs moteurs avec une installation électrique améliorée

Country Status (5)

Country Link
EP (1) EP1445364B1 (fr)
AT (1) ATE384811T1 (fr)
DE (1) DE60318811T2 (fr)
ES (1) ES2299668T3 (fr)
IT (1) ITMI20030183A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004045208A1 (de) * 2004-09-17 2006-04-06 Siemens Ag Webmaschine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2660672B1 (fr) * 1990-04-06 1992-08-28 Staubli Sa Ets Systeme pour l'entrainement d'une machine pour la formation de la foule sur une machine a tisser.
DE4123671A1 (de) * 1991-07-17 1993-01-21 Berger Lahr Gmbh Webmaschine
JPH08302545A (ja) * 1995-05-12 1996-11-19 Tsudakoma Corp 織機の駆動機構
IT1283231B1 (it) * 1996-03-12 1998-04-16 Nuovo Pignone Spa Sistema di comando perfezionato per un telaio tessile senza navetta
DE10061717B4 (de) 2000-12-12 2006-01-26 Lindauer Dornier Gmbh Antriebsanordnung für eine Webmaschine und Fachbildemaschine

Also Published As

Publication number Publication date
EP1445364A2 (fr) 2004-08-11
ITMI20030183A1 (it) 2004-08-05
ES2299668T3 (es) 2008-06-01
DE60318811D1 (de) 2008-03-13
ATE384811T1 (de) 2008-02-15
EP1445364A3 (fr) 2005-01-19
DE60318811T2 (de) 2009-01-22

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