EP0350447B1 - Procédé de commande de la tension de la chaîne et metier à tisser avec dispositif de tension de la chaîne - Google Patents

Procédé de commande de la tension de la chaîne et metier à tisser avec dispositif de tension de la chaîne Download PDF

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Publication number
EP0350447B1
EP0350447B1 EP89810484A EP89810484A EP0350447B1 EP 0350447 B1 EP0350447 B1 EP 0350447B1 EP 89810484 A EP89810484 A EP 89810484A EP 89810484 A EP89810484 A EP 89810484A EP 0350447 B1 EP0350447 B1 EP 0350447B1
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EP
European Patent Office
Prior art keywords
warp
loom
servomotor
tension
warp tension
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Expired - Lifetime
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EP89810484A
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German (de)
English (en)
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EP0350447A1 (fr
Inventor
Rudolf Vogel
Anton Ruedisueli
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Sulzer AG
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Gebrueder Sulzer AG
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    • 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
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D39/00—Pile-fabric looms
    • D03D39/22—Terry looms
    • D03D39/223—Cloth control

Definitions

  • the object of the present invention is therefore to overcome the known problems in connection with the warp tensions and to achieve the best possible warp tension curves under all conditions and in any fabric pattern.
  • higher weaving machine speeds and performances, higher fabric quality and benefits, fewer production interruptions due to thread breaks and stapling and expanded fabric patterning options are to be achieved.
  • this task is solved in the operation of a weaving machine in that the warp tension is modulated by at least one separate drive via warp tensioning elements and is thereby controlled individually and individually.
  • the warp tension can be optimally adapted to all desired conditions in the course of each cycle.
  • the separate drive can advantageously be controlled by a sequence of pulses which are freely programmable in terms of amplitude, pulse width, zero position and phase position and which are matched to the weaving machine cycles and the operating mode of the weaving machine.
  • the warp tension can also be influenced only in a desired partial area of a cycle.
  • the warp tension can be optimized in a targeted manner in the individual sub-areas by controlling a pulse in several sub-areas of a weaving cycle or a weft repeat.
  • the pulses can be controlled independently.
  • At least one pile forming element can also be actuated by a separate drive and can be controlled individually and individually. This enables an improvement in terry weaving and pile quality.
  • a weaving machine for carrying out the method is characterized by at least one servo motor as a separate drive, which is coupled via a reduction gear and / or transmission elements to at least one warp tension member influencing the warp tension, and where the servo motor is connected to a control and regulation circuit with a control input and can be controlled individually in individual shots.
  • the servo motor can be electronically commutated and brushless and have a low inertia rotor with permanent magnets of high field strength. This design results in a particularly highly dynamic drive, with high peak and continuous outputs with relatively low thermal losses to be managed. As a result, the method according to the invention can be carried out with particularly high precision and at high speeds and weaving capacities.
  • the weaving machine according to the invention can have any controlled warp tensioning elements.
  • the warp tension member can e.g. an additional tension roller, which is only driven by the associated servo motor.
  • the warp tensioning element can also be an existing spanning tree system that is driven in a basic movement by the main loom motor and where this basic movement is only additionally modulated and controlled by the servomotor. This means that the constant basic movement can provide constant compensation, while the servo modulation can handle all changing conditions, e.g. optimized according to the pattern.
  • the warp tensioning element can also be driven symmetrically on both side cheeks of the weaving machine by a servo motor, preferably both servo motors being driven and controlled synchronously by only one motor controller. This results in absolutely symmetrical fabrics even with large weaving widths.
  • a reduction gear with a primary element of low inertia on the motor shaft allows the high dynamics of the servo motor to be transmitted down to the chain tensioning element.
  • a plurality of control inputs, measuring inputs and / or data outputs of the control and regulation circuit as well as an assigned computer unit can be provided, bidirectional communication with the weaving machine being possible. This results in an even more universal control and regulation of the warp tension curve and, at the same time, operating data for further processing and for optimizing fabric quality, machine performance and efficiency can be prepared and delivered.
  • each warp thread set can be assigned a warp tension member with an associated servo motor, which can be controlled independently of one another.
  • the warp tension curve of each warp thread group can thus be individually optimized.
  • warp tension elements can be controlled with one or two servo motors each independently of the same control and regulation circuit and thus each warp tension element can be optimally adjusted independently to the desired weaving result.
  • At least one pile formation element with an associated further servo motor can be provided, the control of this servo motor being matched to the terry movement. This can also influence and optimize pile formation.
  • the warp tensioning device 20 consists of a roller 21 as a warp tensioning member, a rack 24 as a transmission element, a reduction stage 63, a pinion 62 on the shaft of a servo motor 36 and a control and regulating circuit 88 move up and down at any rhythm. This movement results in an extension or shortening of the chain 7 and thus a change in the chain tension determined by the shrimp elasticity.
  • Appropriate timing of the servo motor can in principle generate any desired change in warp length or any desired warp tension curve.
  • a Warp tension sensor 52 which is connected to the control and regulation circuit 88, the resulting warp tension is continuously monitored and included in the optimal warp tension control.
  • the warp length control caused by the change of subject can be partially or completely compensated for by the warp tension control 20.
  • the warp tensioning device 20 now creates a possibility of influencing the warp tension whenever the known spanning tree systems are increasingly unable to guarantee a reasonably optimal warp tension curve with increasing speeds.
  • the warp tension control can also be integrated in the tensioning boom system 4 itself or replace it (e.g. as in Fig. 7).
  • Fig. 2 shows a warp tension control with a radially mounted spindle rod 27, which also moves the warp tension member 21 linearly up and down.
  • the spur gear 63 has an internal toothing running on the spindle thread 28. The spur gear 63 is axially supported to support the warp forces.
  • the servo motor 36 has a cooling device 61, in which case a fan supplies cooling air along the stator housing of the servo motor provided with cooling ribs.
  • the servomotor has a low inertia rotor with permanent magnets of high field strength, ie high remanence and high demagnetization field strength.
  • the low inertia of the rotor enables high dynamics, and high field strengths result in high motor torques and outputs, which together result in a high weaving machine speed.
  • Advantageous magnetic materials are rare earth magnets such as SmCo compounds and especially Nd-Fe-B compounds.
  • the use of permanent magnets on the rotor of the servo motor creates ohmic losses only on the stator and not on the rotor of the motor. The resulting heat loss can be dissipated easily and to a greater extent here, for example by means of air or water cooling of the stator. This enables a further increase in the performance of the servo motor also with regard to overload peaks, especially when using neodymium magnets.
  • reduction gears and transmission elements are designed for the lowest possible inertia losses.
  • a two-stage reduction gear with a light spur gear pinion 62 is used on the axis of the servo motor in FIG. 2, which, as the primary element with low mass inertia, rapidly reduces the motor speed, e.g. by a factor of 3 to 5.
  • the engine power share required to accelerate the moving parts, from the motor rotor to the reduction gear, transmission element to the warp tensioning elements is kept as low as possible, thereby enabling the very high weaving machine speeds that are sought.
  • FIG. 3 shows various arrangements of warp tension members 21, 22, 23 with lower (16) and upper (17) guide rollers, the warp tension members being moved in a translatory (25) or rotary (26) manner.
  • the arrangement of FIG. 3a acts, as in FIG. 1, symmetrically with respect to the shed 9. All the warp threads, that is to say high and low shed coulters, are influenced to the same extent. In Fig. 3b the subjects are controlled asymmetrically. If, depending on the binding, individual shafts remain in the high shed during a sheet stop, their warp thread sets can then be relative by the warp tensioning element (in position 22a) are relaxed, while the remaining warp threads 7g at the same time receive a necessary minimum tension by the tension roller 4.
  • the tensioning roller 4 can also be servo-controlled (direction of movement 26). Positions of the warp tension member between 22b and 22c, on the other hand, result in an essentially symmetrical warp force control in the high compartment 7h and in the deep compartment 7t. 3c, the warp threads are divided into two groups 40, 41 by two warp tensioning members 21, 22. This means that each warp thread group can be optimally controlled individually and independently of the other by the associated warp tension element and its servo motor. The same effect can also be achieved with the walk-like chain tensioning element 23 in FIG. 3d. For this purpose, the organ 23 is moved translationally in the direction 25 by a first servo motor. A second servo motor rotates the member 23 about its axis of rotation 29 in the direction 26.
  • a control and regulation circuit 88 with a control input 89 consists of a terry control 74 which controls a motor controller 76.
  • the motor controller 76 drives the servomotor 36 via a power unit 77 connected to a supply 73.
  • the motor controller 76 is connected to a motor angle sensor 79 for the purpose of synchronization.
  • a plurality of servomotors 36, 37 for actuating a plurality of warp tension members can also be controlled independently (76, 77, 79 each a and b). Control of the deflection (and thus the warp tension) can thus be achieved in very small steps of, for example, only 0.1 mm.
  • the warp tension control 74 is connected to the weaving machine bus 82 and to a weaving machine crank angle sensor 81 for absolute synchronization of the motor control with the weaving machine, for forward and backward running.
  • the weaving machine bus 82 is further coordinated with the warp let 84, the dobby machine control 86 and the other weaving machine functions such as fabric take-off and color changer control.
  • a display and operating unit 87 as well as various measurement inputs 83 (for example from warp tension sensors) and data outputs 90 are also connected to the weaving machine bus 82. This enables bidirectional communication between the weaver and the warp tension control, as well as a link to a central control system.
  • the control control circuit 88 also includes a computer unit with memory. A corresponding single-shot optimization of the warp tension curve can thus be generated, saved and called up again for any fabric patterns generated by the shaft control. A warp tension modulation is assigned to each shot of a pattern repeat.
  • a desired predetermined optimal warp tension curve can be automatically maintained.
  • FIG. 5 shows a low-mass tensioning roller system 66, which executes a rotary movement as a chain tensioning element (same as the tensioning tree 4 in FIG. 3b).
  • the tensioning roller system is driven by a servo motor 37 via a pinion 62, an intermediate stage 63 and a toothed segment 64. It consists of a rigid support roller 67, a light pendulum tube 69 and connecting supports 68. This results in a low mass inertia of the tensioning roller system 66.
  • An additional, adjustable biasing spring 71 and a damper 72, acting on the tensioning roller 66, can also be provided.
  • the servo motor 37 is also controlled by the warp tension control 74 (Fig.
  • such a low-mass tensioning tree system can also be used as a pile tensioning tree or pile pendulum roller.
  • the pile pendulum roller has the task of delivering the pile chain accordingly quickly and with the least possible tension during the almost sudden pushing open of the pile at full stop (this is especially the case with control of the web shop). To do this, the pile pendulum roller must move very quickly, without delay and easily. On the other hand, however, a minimal pile warp tension must be maintained during the rest of the time in order to ensure undisturbed warp feed without thread crossings. With previous suspended pendulum roller systems, these conflicting requirements can only be met to a very limited extent (FIG. 6e). 5, these contradicting requirements can now be met and optimal warp tension profiles can be controlled for any operating modes and terry rhythms.
  • FIG. 6a shows an optimal servo-controlled warp tension pulse curve 100 to compensate for a corresponding warp length change when the compartment is opened.
  • the optimal curve 100 is controlled by the servo motor such that its amplitude A, pulse width B, zero position U, pulse duration P and phase I correspond to the target compensation in the weaving machine cycle.
  • a previously sprung tensioning tree system especially at high weaving machine speeds, only achieves poor, "smeared" compensation in accordance with curve 101.
  • inertia there is a phase shift dI and a reduced amplitude.
  • the previous compensation by the spanning tree thus deviates from the optimal course 100 by the areas 102 and 120.
  • warp tension increased by area 102 occurs when the sluggish tensioning roller is unable to follow the specialist movement. The tensioning roller then overshoots with an undesirable relaxation of the warp threads corresponding to the region 120.
  • the previous warp tension curve 103 is modulated by several servo pulses P1, P2, P3 so that an optimized warp tension curve 105 is created.
  • the course 105 is regulated by the pulses P1, P2 under a predetermined maximum target value Fmax corresponding to the yarn strength.
  • pulse 3 does not fall below a predetermined minimum warp tension Fmin.
  • the previous average warp tension curve 106 of a warp thread family in FIG. 6c shows an example in which this warp thread family remains in the high shed in cycle 1 when the sheet is stopped and therefore has high tension values.
  • the compartment closes again and the warp tension values remain low.
  • the tension of individual warp threads is higher than the maximum Values 107 and lower minimum values 108 reach than the average warp tension values 106. Individual threads can therefore tear and cling earlier than would be expected due to the average tension curve 106. This must be taken into account when specifying the setpoints Fmax and Fmin.
  • the pulses P4, P5, P6 of the servo modulation 109 are activated in order to achieve a desired resulting warp tension curve 110.
  • very short warp tensions Fmaxk are permissible for a very short time, e.g. as tension peak 126 at the blade stop, than with longer exposure times, e.g. in the open compartment, which is compensated here by pulse P4.
  • 6d shows a change of weave from a 2: 1 warp twill weave to a 1: 1 plain weave. So first a weft repeat 3, where alternately a warp thread sheet always remains in the high compartment when the sheet stops and where the other two thread sheets close or change at the same time. In cycle 1, therefore, the warp tension curve 111 of the first set of threads (in the high compartment) shows high values, while the tensions of the second and third set of threads 112 and 113 remain low. The tension curve 112 is high in cycle 2 and 113 high in cycle 3.
  • the servo pulses 116 in the unloading direction are always applied to the respective group of threads in the high compartment, for example by arranging the warp tension members according to FIG. 3b.
  • the resulting warp tensions 121, 122, 123 then all remain below Fmax. Then the change to a two-shot repeat with two sets of threads, which always close when the blade stops (each shaft changes after each shot), the average warp tension curve of all warp threads is below Fmax.
  • the servo modulation 116 is changed accordingly in cycles 4 and 5. This could be followed by a 2: 1 and a 1: 1 binding again. This would give a fabric pattern repeat N of five cycles.
  • FIG. 6e shows the servo-optimized course of a pile warp tension 125 with a 3-shot terry rhythm.
  • a pile pendulum roller according to FIG. 5 is controlled by the servo motor in such a way that the pile warp tension is momentarily reduced to an almost arbitrarily small value F1 of a few grams by means of a corresponding pulse during the pole shift 91.
  • F1 substantially constant value
  • the tension is brought to a higher, substantially constant value F2 which can be optimally adapted to the yarn and the operating parameters.
  • curve 125 generated according to the invention has an optimal warp force curve, this is not possible with previous pendulum rollers, according to curve 124.
  • the minimum warping force F1 and the optimum phase position and pulse shape with respect to pole extension 91 cannot be achieved there.
  • FIG. 7 shows a terry weaving machine with fabric control, in which the fabric control elements, here a tensioning tree 4 and a breast tree 6 as pile formation elements, are controlled by servomotors 36, 37.
  • the basic warp beam 1 is arranged at the top and the pile warp beam 2 is arranged at the bottom for easy interchangeability.
  • the looping is carried out by periodic horizontal movements of the fabric by means of the breast beam 6 and spreader 128, whereby the fabric edge around the fabric stroke is pulled away from the reed attachment point. The reed movement remains unchanged.
  • the resulting pile height is essentially proportional to the tissue stroke.
  • the two tensioning trees 4 and 117 have to release the corresponding chains 7 and 8 just as quickly and at the same time ensure the necessary chain tension values.
  • This rapid warp feed by a precisely defined fabric stroke of e.g. 20 mm takes place in less than one weaving cycle T.
  • the terry toweling elements 4 and 6 are driven separately by a servomotor each.
  • the breast beam 6 is driven by the servo motor 36 via a lever 131 with an axis of rotation 132 and teeth 136, while the tensioning roller 4 is operated by a separately controlled servo motor 37 via a lever 140.
  • the warping forces 137 and 138 are preferably absorbed here by pretensioning springs 141 and 142, which act on the levers 131, 140.
  • the springs 141 and 142 are set in such a way that average warp force values at an average fabric stroke are just compensated by their spring forces.
  • the specialist compensation is also integrated here.
  • the breast beam 6 or the tensioning beam 4 can be driven laterally or in the middle on one side via the levers 131, 140.
  • asymmetrical twists which can cause asymmetrical fabric and pile formation, can be avoided.
  • a An advantageous, even more powerful design can also have two servo motors 38a, 38b, which are each arranged on a side cheek 134a, b of the weaving machine and synchronously drive the breast boom 6 and the tensioning roller 4 via a lever.
  • both servomotors 38a, b can be operated by only one motor controller 76 and one power unit 77.
  • the pile tensioning tree 117 as a secondary pile-forming member, as described in FIG. 5, can also be controlled by the tissue or terry control 74 by means of a further independent servo motor.
  • the inventive servo control of the warp tensions can also be applied to a weaving machine with an effect tree instead of the pile warp beam 2 of the terry weaving machine from FIG. 7.
  • Fig. 8 shows an example with a warp tension member which is driven by the loom main motor in a constant basic movement, this basic movement being freely modulated by a servo motor.
  • a spanning tree 4 is rotatably mounted on a one-armed lever 144.
  • the lever 144 is articulated to a two-armed lever 146, the other end of which has a toothing 32.
  • the central pivot bearing 147 is held stationary in the weaving machine frame.
  • the servomotor 36 moves, via a worm pinion 33 and the toothing 32, the lever 146 and the lever 144, the tensioning roller 4.
  • the lower end of lever 144 is connected to the weaving machine main motor shaft 13 via a coupling rod 148 and an eccentric 149.
  • the spanning tree 4 is forcibly driven in a fixed, cyclical basic movement 150. This can roughly correspond to a constant specialist adjustment.
  • the actual optimization of the warp tension and its adaptation to the change of binding then takes place by means of the single-shot free modulation from the servomotor 36 to the upper end of lever 144.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Control Of Multiple Motors (AREA)

Claims (18)

1. Procédé de commande de la tension de la chaîne de machines à tisser, caractérisé en ce que la tension de la chaîne est modulée par au moins une commande séparée au moyen d'organes de tension de la chaîne et de plus est pilotée librement et à chaque insertion individuelle de la trame.
2. Procédé selon la revendication 1, caractérisé en ce que la commande séparée est pilotée par une séquence d'impulsions dont l'amplitude, la largeur, la position zéro et la position de la phase sont librement programmables et qui sont coordonnées avec les cycles de la machine à tisser et le mode opératoire de la machine à tisser.
3. Procédé selon la revendication 2, caractérisé en ce que les impulsions sont pilotées à une durée P qui est plus courte qu'un cycle T de la machine à tisser.
4. Procédé selon la revendication 2, caractérisé en ce qu'une impulsion est pilotée à chacune de plusieurs plages partielles d'un rapport de trame, les impulsions étant indépendantes les unes des autres.
5. Procédé selon la revendication 2, caractérisé en ce que les impulsions qui sont pilotées dans les plages partielles des cycles de la machine à tisser au cours desquels apparaissent les valeurs maximales de la tension de la chaîne réduisent ces valeurs maximales par exemple au-dessous d'une valeur réglable de consigne.
6. Procédé selon la revendication 1 pour la mise en oeuvre d'une machine à tisser du tissu éponge qui comprend des organes de formation des poils, caractérisé en ce qu'en plus de la modulation de la tension de la chaîne, au moins un organe de formation des poils est également actionné par une autre commande séparée et de plus pilotée librement et à chaque insertion inviduelle de trame.
7. Machine à tisser pour la mise en oeuvre du procédé selon la revendication 1, caractérisée par au moins un servomoteur (36, 37, 38) constituant une commande séparée qui est couplée à au moins un organe (21, 22) influant sur la tension de la chaîne par l'intermédiaire d'un train d'engrenage démultiplicateur (62, 63, 64) et/ou d'éléments de transmission (24, 27, 131), le servomoteur étant relié par une entrée de commande (89) à un circuit de commande et de réglage (88) et pouvant être piloté librement et à chaque insertion individuelle de trame.
8. Machine à tisser selon la revendication 7, caractérisée par un servomoteur sans balai, à commutation électronique, qui comprend un rotor à faible inertie de masse, équipé d'aimants permanents à forte intensité du champ.
9. Machine à tisser selon la revendication 8, caractérisée en ce que le servomoteur (36, 37, 38) comprend des aimants en terres rares.
10. Machine à tisser selon la revendication 8, caractérisée en ce que les aimants sont en des composés à base de Nd-Fe-B.
11. Machine à tisser selon la revendication 8, caractérisée en ce que le servomoteur comprend un stator refroidi (61).
12. Machine à tisser selon la revendication 7, caractérisée en ce que l'organe (66) de tension de la chaîne est commandé directement en n'étant couplé qu'au servomoteur.
13. Machine à tisser selon la revendication 7, caractérisée en ce que l'organe de tension de la chaîne est entraîné par le moteur principal de la machine à tisser à effectuer un mouvement de base, ce mouvement de base pouvant accessoirement être modulé ou commandé par le servomoteur.
14. Machine à tisser selon la revendication 7, caractérisée en ce qu'un train démultiplicateur qui est prévu comprend un élément primaire (33, 62) ayant une faible inertie de masse et qui est relié à l'arbre du moteur.
15. Machine à tisser selon la revendication 7, caractérisée en ce que plusieurs entrées de commande (87, 89), entrées de mesures (83, 85) et/ou sorties de données (90) du circuit de commande et de réglage ainsi qu'une unité correspondante de calcul sont prévues, une communication bidirectionnelle avec la machine à tisser étant possible.
16. Machine à tisser selon la revendication 7, comprenant au moins deux nappes de fils de chaîne, caractérisée en ce qu'un organe de tension de la chaîne et un servomoteur correspondant sont affectés à chaque nappe de fils de chaîne et peuvent être pilotés indépendamment les uns des autres.
17. Machine à tisser selon la revendication 7, caractérisée en ce que l'organe de tension de la chaîne peut être piloté symétriquement sur chacun des deux flasques latéraux (134a, 134b) de la machine à tisser par un servomoteur (38a, 38b), les deux servomoteurs étant de préférence entraînés et commandés ensemble en synchronisme par une unique commande (76).
18. Machine à tisser du tissu éponge selon la revendication 7, caractérisée en ce qu'en plus de l'organe de tension de la chaîne et de sa servocommande, au moins un organe (6, 128) de formation des poils auquel un autre servomoteur est affecté est de plus prévu, le pilotage de ce servomoteur étant coordonné avec la formation des poils.
EP89810484A 1988-07-08 1989-06-22 Procédé de commande de la tension de la chaîne et metier à tisser avec dispositif de tension de la chaîne Expired - Lifetime EP0350447B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2623/88 1988-07-08
CH262388 1988-07-08

Publications (2)

Publication Number Publication Date
EP0350447A1 EP0350447A1 (fr) 1990-01-10
EP0350447B1 true EP0350447B1 (fr) 1992-03-25

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Country Link
US (1) US5014756A (fr)
EP (1) EP0350447B1 (fr)
JP (1) JP2902669B2 (fr)
CN (1) CN1026138C (fr)
DE (1) DE58901019D1 (fr)

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CN1040407A (zh) 1990-03-14
JP2902669B2 (ja) 1999-06-07
JPH0247337A (ja) 1990-02-16
US5014756A (en) 1991-05-14
CN1026138C (zh) 1994-10-05
EP0350447A1 (fr) 1990-01-10
DE58901019D1 (de) 1992-04-30

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