EP2341170B1 - Drive unit for weaving looms with a high degree of use flexibility, provided with safety controlling device for possible critical phase displacements of the moving mechanical members and weaving process using such unit - Google Patents

Drive unit for weaving looms with a high degree of use flexibility, provided with safety controlling device for possible critical phase displacements of the moving mechanical members and weaving process using such unit Download PDF

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Publication number
EP2341170B1
EP2341170B1 EP10197114A EP10197114A EP2341170B1 EP 2341170 B1 EP2341170 B1 EP 2341170B1 EP 10197114 A EP10197114 A EP 10197114A EP 10197114 A EP10197114 A EP 10197114A EP 2341170 B1 EP2341170 B1 EP 2341170B1
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EP
European Patent Office
Prior art keywords
drive unit
weaving
joint
motor
motors
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EP10197114A
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German (de)
English (en)
French (fr)
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EP2341170A1 (en
Inventor
Giuseppe Casarotto
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Itema SpA
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Itema SpA
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • D03C1/14—Features common to dobbies of different types
    • D03C1/146—Independent drive motor
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/02—General arrangements of driving mechanism

Definitions

  • the present invention refers to a drive unit for weaving looms, and in particular to a unit of thins type which allows a high degree of use flexibility of the loom from a weaving point of view and, simultaneously, which prevents possible failures of the moving mechanical members of the loom through a safety controlling device apt to prevent that any phase displacements of such members exceed preset critical values.
  • the invention also concerns a weaving process which uses such drive unit.
  • the traditional solution provides the use of a main motor, to which all the moving members of the loom are connected through suitable kinematic mechanical connections, and in particular the main movements of the sley with reed, of the weaving machine and, in gripper looms, of the grippers for weft introduction into the shed.
  • the main motor is normally kept in constant rotation and hence a clutch assembly and a flywheel are essential components of such solution to allow start and stop transient conditions, respectively, as well as a satisfactory operation evenness.
  • a secondary electric motor was furthermore provided for actuating the sole weaving machine when disconnected from the drive of the main motor, the so-called “slow run", for the purpose of performing the backward search of the shed after the insertion of a wrong weft.
  • a first one of these innovative solutions concerns the simplification of the drive unit due to the removal of the clutch, of the flywheel and of the secondary motor.
  • the functions performed by these members in this solution are all played by main motor M.
  • said motor can be drive at reduced speed and in both rotation directions to perform the simultaneous slow run of loom T and of weaving machine A, or that of sole weaving machine A.
  • Engagement systems are hence present which allow the disengagement from motor M of sole loom T, despite maintaining the movement of weaving machine A.
  • main motor M the electric supply power of which is variable so as to accomplish sufficiently quick start and stop transient conditions and as to compensate - electrically/electronically rather than mechanically - the fluctuation of the overall resistant moment of the weaving machine and of the loom within each cycle.
  • figs. 2 and 3 Solutions of this type are schematically shown in figs. 2 and 3 .
  • a clutch F possibly combined with a double front toothed joint, wherein a first joint IM is a rotary running joint, preferably with multiple connection positions spaced apart by a constant pitch (for example 4-5°) while second joint I is a halting joint to keep halted the moving members of loom T when clutch F is disengaged.
  • the moving disc of clutch F has an axial play designed so that, during the clutch detachment/attachment operation, a phase is entered in which said moving disc is meshed both with running joint IM and with halting joint I.
  • a second more recent innovation provides instead the full duplication of the motorization so as to obtain independent controls for weaving machine A and for loom T by means of respective motors MA and M.
  • Weaving machine A and loom T are hence fully independent from a mechanical point of view and their synchronism is guaranteed by means of an electric/electronic control system managed through a suitable software, commonly known as "electric-axis" and schematically shown in the drawing by block E.
  • a solution of this operating mode of a loom drive is disclosed for example in EP-1312709 in the name of the same Applicant, in EP-1775361 (SMIT ), in US-7114527 and WO-2006/039912 (both in the name of Dornier ).
  • This last solution is the one which - from a weaving point of view - compared to the other preceding solutions illustrated above which are characterised by a constant and absolute synchronism between the movements of the different loom members, and which hence offer an opportunity for mutual phasing of the same only with a halted loom - has a much higher degree of use flexibility consisting in the opportunity of adjusting the mutual phasing of said members (reed and possibly grippers on the one hand, and weaving machine with relative heald frames on the other one) also during loom processing and even within a same weft insertion cycle and/or between groups of subsequent cycles.
  • This opportunity proves particularly useful both during the transient start and stop phases, and during the shed search phases with a halted loom, and during running conditions, where the opportunity to adjust shed opening and closing, possibly also depending on the individual weft inserted, can allow the processing of items which in conventional looms are instead difficult or problematic to weave.
  • this solution has a greater mechanical construction simplicity, in particular as concerns the motion transmission members which are highly simplified.
  • a first one of such drawbacks is linked to the fact that, in running condition, the independence of the two drive units no longer allows to partly compensate with one another the cyclical oscillations of the torque between weaving machine and loom.
  • the regularisation of the movement of both the drive units must hence be obtained exclusively through the management of the flow of electric energy for the supply of the electric-axis connected motors, which normally causes an oversizing of the motor assemblies, with a resulting greater installed and also actually consumed power.
  • a second and more serious drawback is connected to the risk of collision of the weft transfer members (tapes and grippers) with the warp yarns driven by the motion, of the weaving machine, following significant losses of angular synchronism due to malfunctioning, such as for example failure of the electronic systems (drive, software, encoder etc.), or to sudden and unexpected increases/decreases of the varying, resistant fraction forces of the waving machine or of the loom.
  • Another risk situation as concerns the maintenance of synchronism conditions between the weaving machine and the loom - furthermore arises in case of sudden lack of power.
  • the problem at the basis of the present invention is hence that of proposing a drive unit for weaving looms which, despite capturing all the weaving advantages of the solution with independent motors described above, overcomes the limitations thereof and the drawbacks indicated above and hence offers high condition of safety both for the dedicated staff and for the integrity of the moving members of the loom.
  • a first embodiment of drive unit 1 according to the present invention (fig. 5 ) consists of a pair of motors 2 and 3 made mutually integral in the fixed outer case, so that the rotors of said motors are coaxial. Said coaxial rotors are mounted on respective shafts 4 and 5 which carry on the outer end of unit 1 driving pinions 6 and 7, which represent the outer power takeoffs for driving a loom T and a weaving machine A, respectively.
  • both motors 2 and 3 furthermore have a second power takeoff, through which they can be made mutually integral to rotation.
  • said second power takeoffs are arranged in correspondence of the opposite inner ends of shafts 4 and 5, each of which carries - as inner power takeoff of unit 1 - one of the two cooperating portions 8 and 9 of a front electromagnetic spring joint.
  • the construction of the joint is preferably of the passive-joint type, i.e. wherein the coupling position of the joint is determined by said springs in the absence of electric excitation and vice versa.
  • the two shafts 4 and 5 are hence mutually free and the two motors 2 and 3 have an operation fully independent from a mechanical point of view.
  • the electromagnet of joint 8, 9 is not energised, a rigid connection to rotation of the two shafts 4 and 5 occurs and the two motors 2 and 3 rotate in perfecto sync.
  • the joint 8, 9 may also advantageously be of the so-called "viscous-operation" type, i.e.
  • the drive unit according to the present invention can hence - depending on the different operation requirement connected to the various work phases of the loom and/or tot he type of woven item, and depending on the position of joint 8, 9 - act as a pair of independent motors or as a single motor.
  • the solution of the present invention hence allows to have on the one hand maximum flexibility of use of the two motors, making them mutually (fully or partly) free from a. mechanical point of view by exciting joint 8, 9, as illustrated in fig. 6a , and adjusting the controlled phase displacement thereof through electronic means well-known per se (electric-axis).
  • the same drive unit allows to obtain the maximum level of safety, since the disexcitation of joint 8, 9 is capable of bringing back immediately motors 2 and 3 in rigid mechanical-axis connection, as illustrated in fig. 6b , whenever this is necessary or useful.
  • this mechanical-axis connection between the two motors can for example be activated, for safety purpose, when the phase displacement between the two motors exceeds a predefined safety limit value or - and this in a fully automatic way, i.e. without the need of an active control - when electric energy supply fails due to failures or power cut-off, thus removing any possibility of failures of the moving members of the loom or of the warp yarns and hence the drawbacks and the costs connected with the repair thereof and the loss of efficiency due to the resulting time of machine downtime.
  • the mechanical-axis connection can of course also be used in normal weaving conditions, in running conditions, whenever there is no longer the need to have controlled varying phase displacements between loom T and weaving machine A.
  • the drive unit of the present invention has an extremely compact configuration and can hence be advantageously installed on the edge of the loom in a "strategic" position existing between the main shaft 10 of loom T and the main shaft 11 of weaving machine A ( figs. 6A and 6B ) which is normally devoid of other members, thus obtaining a very "neat” loom design and a dramatic bulk reduction over the kinematic motion transmission chains between loom and weaving machine found in known-type looms, which kinematic chains are as a matter of fact fully replaced by the only two coaxial shafts 4 and 5 of drive unit 1.
  • a second embodiment of the invention illustrated in fig. 7
  • the one of motor 3 provides that the second power takeoff of said motor is arrange on an extension of shaft 5 beyond pinion 7, and hence on the same side of motor 3 where the first power take off is already arranged, consisting indeed of pinion 7, instead of opposite parts as in the first embodiment. Due to this design of motor 3, and as appears evidently from the drawings, it is possible to obtain an even more compact design of the drive unit 1 of the present invention.
  • the design of the drive unit of the present invention finally allows to use motors 2 and 3 consisting of fully identical assemblies, mounted in a coaxial position on the two sides of electromagnetic joint 8, 9.
  • This arrangement allows remarkable advantages both from the point of view of the manufacturing costs of drive unit 1, and from the point of view of the maintenance and storage costs of the required spare parts.
  • the drive unit of the present invention is of course capable of achieving all the advantages of flexibility in the weaving operations typical of the systems with electric-axis direct motorisation.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Braiding, Manufacturing Of Bobbin-Net Or Lace, And Manufacturing Of Nets By Knotting (AREA)
  • Bedding Items (AREA)
EP10197114A 2009-12-30 2010-12-28 Drive unit for weaving looms with a high degree of use flexibility, provided with safety controlling device for possible critical phase displacements of the moving mechanical members and weaving process using such unit Active EP2341170B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2009A002337A IT1397372B1 (it) 2009-12-30 2009-12-30 Unita' di comando per telai tessili ad elevata flessibilita' di uso, munita di dispositivo di controllo di sicurezza rispetto a possibili sfasamenti critici degli organi meccanici mobili e procedimento di tessitura che utilizza tale unita'

Publications (2)

Publication Number Publication Date
EP2341170A1 EP2341170A1 (en) 2011-07-06
EP2341170B1 true EP2341170B1 (en) 2012-10-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP10197114A Active EP2341170B1 (en) 2009-12-30 2010-12-28 Drive unit for weaving looms with a high degree of use flexibility, provided with safety controlling device for possible critical phase displacements of the moving mechanical members and weaving process using such unit

Country Status (5)

Country Link
EP (1) EP2341170B1 (xx)
JP (1) JP2011137280A (xx)
CN (1) CN102115941B (xx)
HK (1) HK1159196A1 (xx)
IT (1) IT1397372B1 (xx)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110501286B (zh) * 2019-08-01 2024-06-18 大庆油田自动化仪表有限公司 电脱离心式测量原油含水的高压电极自动升降装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1223621B (it) * 1987-12-30 1990-09-29 Baruffaldi Spa Giunto a doppio innesto, particolarmente per telai da tessitura
JP2796840B2 (ja) * 1989-06-15 1998-09-10 津田駒工業株式会社 織機の同期ずれ防止方法
BE1010849A3 (nl) * 1997-01-14 1999-02-02 Picanol Nv Aandrijving voor een weefmachine.
IT1317570B1 (it) 2000-05-25 2003-07-09 Promatech Spa Gruppo di comando di un telaio di tessitura,privo di volano e frizione
IT1318931B1 (it) * 2000-09-26 2003-09-19 Baruffaldi Spa Giunto per l'accoppiamento in rotazione di alberi di azionamento dimacchine di armatura e telai di macchine tessili.
DE60129026T2 (de) * 2001-11-20 2008-02-21 Promatech S.P.A., Colzate Webmaschine mit einer Vorrichtung zur Betätigung des Webmechanismus
DE10206972A1 (de) 2002-02-20 2003-09-04 Dornier Gmbh Lindauer Antriebsanordnung einer Webmaschine und Fachbildemaschine mit getrennter Antriebstechnik
DE10225037A1 (de) * 2002-06-06 2003-12-24 Dornier Gmbh Lindauer Webmaschine mit einer Antriebsanordnung zum Konstanthalten der Betriebsdrehzahl
ITVI20040129A1 (it) 2004-05-25 2004-08-25 Smit Spa Dispositivo di comando per telai tessili
DE102005046271B4 (de) 2004-10-09 2006-12-28 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Verfahren zum Betreiben einer Web- und einer Fachbildemaschine
CN2745964Y (zh) * 2004-11-02 2005-12-14 江苏省高淳纺织机械有限公司 织机主驱动装置
ITVI20050278A1 (it) 2005-10-17 2007-04-18 Smit S P A Sistema di comando modulare per macchine per tessere

Also Published As

Publication number Publication date
HK1159196A1 (en) 2012-07-27
CN102115941A (zh) 2011-07-06
CN102115941B (zh) 2014-05-14
JP2011137280A (ja) 2011-07-14
IT1397372B1 (it) 2013-01-10
EP2341170A1 (en) 2011-07-06
ITMI20092337A1 (it) 2011-06-30

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