EP2460918B1 - Selection device for controlling a dobby, selection unit and dobby controlled by such a selection device - Google Patents

Selection device for controlling a dobby, selection unit and dobby controlled by such a selection device Download PDF

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Publication number
EP2460918B1
EP2460918B1 EP11191915.5A EP11191915A EP2460918B1 EP 2460918 B1 EP2460918 B1 EP 2460918B1 EP 11191915 A EP11191915 A EP 11191915A EP 2460918 B1 EP2460918 B1 EP 2460918B1
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EP
European Patent Office
Prior art keywords
selector
selection device
selection
axis
actuating element
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EP11191915.5A
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German (de)
French (fr)
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EP2460918A1 (en
Inventor
Clément Champion
Sylvain Puget
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Staubli Faverges SCA
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Staubli Faverges SCA
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Publication of EP2460918A1 publication Critical patent/EP2460918A1/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03C—SHEDDING MECHANISMS; PATTERN CARDS OR CHAINS; PUNCHING OF CARDS; DESIGNING PATTERNS
    • D03C1/00—Dobbies
    • 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

Definitions

  • the invention relates to a selection device for controlling a dobby of a loom.
  • the invention also relates to a dobby controlled by such a selection device.
  • the present invention relates to dobbies for forming the shed in the weaving machines, more particularly to the selection devices which control the operation of the dobby according to the weave to be made for the fabric being manufactured.
  • a heald frame of the loom is raised, lowered or held in position according to the position selectively occupied by the associated selection device.
  • EP-A-0 851 047 discloses a selection device for the actuation of a dobby which comprises a pivoting selector for selectively actuating one or the other of two rocking members which allow to actuate one of the levers of the dobby to raise or lower a smooth frames.
  • An electromagnet controls the selection device and is controlled by a reading device.
  • the pivoting selector carries a metal frame, movable in rotation relative to the selector. One end of the armature is permanently near a first pole of the electromagnet, while another end of the armature is movable and can move away from or approach a second pole of the armature. electromagnet according to the power supply of the electromagnet.
  • this selection device is cumbersome and complex architecture because it requires the use of an electromagnet and a spring-loaded metal frame which are of significant dimensions. This is disadvantageous because the looms include a relatively large number of these selection devices, to operate each of the levers dobby.
  • WO-A-97/32066 discloses a coupling device for a weaving machine.
  • a heald frame is hitched to a connecting rod associated with an eccentric mounted around a tree.
  • a tilting member and a lever are connected to the eccentric.
  • the tilting member and the lever are actuated respectively by a selector.
  • the selector is actuated by means of an actuating device.
  • this actuating device is formed by a piezoelectric element controlled by a control member.
  • the piezoelectric element is engaged with the selector, the latter being fixed to the rocker member.
  • One end of the tilting member is directly engaged with a notch of the main shaft of the dobby.
  • the piezoelectric elements are fragile elements and this arrangement causes a risk of breakage of the piezoelectric element.
  • the end of the piezoelectric element is in direct contact with the selector.
  • the deformation of the piezoelectric element is therefore equal to the displacement of the selector.
  • the range of movement of the selector is thus limited.
  • the invention more particularly intends to remedy by proposing a selection device for controlling a dobby of a loom, whose size is reduced and whose architecture is simplified.
  • the subject of the invention is a selection device for the control of a rotating positive loom of a loom, comprising a selector, intended to selectively position at least one rocker member, as a function of the armor desired for the fabric being manufactured, and an actuating element of piezoelectric nature, for operating the selector.
  • the rocker member controls at least one coupling member.
  • the selector is rotatable relative to a support member that supports the selector.
  • a first length, measured between, on the one hand, an axis of rotation of the selector with respect to the support member and, on the other hand, an end of the selector, intended to selectively position each rocker member, is greater than one second length, measured between, on the one hand, the axis of rotation of the selector and, on the other hand, a contact zone between a movable end of the actuating element, intended to actuate the selector, and the selector .
  • each heddle frame is raised, lowered or held in position by means of an actuating element of piezoelectric nature whose footprint is low and whose design is simplified.
  • the rocker member controls at least one coupling member.
  • the piezoelectric element is not in direct interaction with an element which rotates with the main shaft, which makes it possible to limit the risk of breakage of the piezoelectric element.
  • the displacement of the selector is amplified relative to the movement of the actuating element, which allows the selector to move with a relatively large amplitude of movement, which is advantageous for the control of certain dodgings.
  • the invention also relates to a selection assembly for the control of a rotating positive loom of a loom, comprising a plurality of selection devices as described above, each supported by a support member common to all the selection devices.
  • the invention relates to a rotating positive dobby controlled by such a selection device.
  • the figure 1 schematically illustrates a rotating positive dobby blade 1 belonging to a loom M.
  • Xc denotes a direction of the warp son of a fabric being manufactured.
  • the mechanism of the dobby 1 is of known construction and comprises, for the operation of each of the heddle frames 10 of the loom M, an oscillating lever 11 which is coupled to a connecting rod 12 to which are associated, on the one hand, an eccentric 13 mounted idle on a main shaft 14, driven by an intermittent rotational movement, and on the other hand, a coupling member 15 fixed to a plate secured to the eccentric 13, and rotatable relative to this tray.
  • the direction Xc is perpendicular to the planes in which the movement of the heald frames 10 takes place.
  • each lever 11 and the frame 10 which it drives is ensured by a connection by cables and / or connecting rods.
  • a spring 154 tends to engage a spout 152 of the coupling member 15 in one or other of two notches 162 of a driver 16 integral with the shaft 14, thereby ensuring the rotation of the eccentric 13 and the setting in motion of the rod 12.
  • the coupling member 15 is provided for the selective coupling in rotation of the eccentric 13 which constitutes a moving element of the connecting rod 12, with the driving element 16.
  • rocking members which consist of two read arms 17 and 18 articulated in rotation, respectively around X17 and X18 axes, fixed relative to a frame 2 of the dobby 1.
  • a restoring force F172 exerted by a spring 172 attached to the reading arm 17, tends to push one end 170 of the reading arm 17 towards the shaft 14, as indicated by the arrow F17 at the figure 1 .
  • a restoring force F182 exerted by a spring 182 hooked to the reading arm 18, tends to push an end 180 of the reading arm 18 towards the shaft 14, against the hook 15, as indicated by the arrow F18.
  • the springs 172 and 182 tend to recall the reading arms 17 and 18 against pushers 19.
  • a selection device 3 makes it possible to actuate the oscillating lever 11 of the dobby 1, via the mechanism of the dobby 1, in order to raise, lower or maintain in high or low position the frame of heddles 10.
  • the selection device 3 extends in the extension of the reading arms 17 and 18 and selectively positions one or the other of the reading arms 17 and 18, depending on the armor desired for the fabric in progress.
  • the selection device 3 comprises a single-sided polymer selector 5 and an actuating element of piezoelectric nature which consists of a piezoelectric lamella 7. As indicated by the arrow F7, the lamella 7 deforms when a control unit 100 makes vary its power supply. The movement of the selector 5, represented by the arrow F5, is caused by the deformation of the lamella 7.
  • a piezoelectric actuator denotes a controllable monobloc member which deforms, when its power supply varies, so as to generate a moving a part of this body relative to another part.
  • the lamella 7 is arranged with its larger faces, that is to say its lateral faces 76 and 78, oriented parallel to the Xc direction of the warp son. Considering the representation of the figure 2 , the face 76 is described as upper and the face 78 lower.
  • the dobby 1 comprises a selection assembly 30 composed of several selection devices 3, similar to that of the figure 1 , which each control one of the oscillating levers 11 of the dobby 1.
  • the dobby 1 comprises a selection assembly 30 composed of several selection devices 3, similar to that of the figure 1 , which each control one of the oscillating levers 11 of the dobby 1.
  • the dobby 1 comprises a selection assembly 30 composed of several selection devices 3, similar to that of the figure 1 , which each control one of the oscillating levers 11 of the dobby 1.
  • the dobby 1 comprises a selection assembly 30 composed of several selection devices 3, similar to that of the figure 1 , which each control one of the oscillating levers 11 of the dobby 1.
  • the dobby 1 comprises a selection assembly 30 composed of several selection devices 3, similar to that of the figure 1 , which each control one of the oscillating levers 11 of the dobby 1.
  • the dobby 1 comprises a selection assembly 30 composed of several selection devices 3, similar to that of the figure 1
  • the width l7 of the lamella 7, measured along the direction Xc of the warp threads, that is to say perpendicular to the plane of the Figures 1 to 3 , is less than or equal to division d of the loom, shown in figure 4 .
  • the division d is a distance which corresponds to the thickness of each heald frame, parallel to the direction Xc. In practice, the division d is approximately equal to 12 mm.
  • the figure 2 shows in greater detail one of the selectors 5.
  • a first position of the selector 3, for the positioning of the reading arm 17, is represented in continuous lines, while a second position of the selector 3, for the positioning of the reading arm 18, is represented in dotted lines.
  • a first end 52 of the selector 5 is bored and is threaded onto a shaft 21, integral with the frame 2, of longitudinal axis X21 parallel to the direction Xc.
  • the selector 5 is rotatable relative to the frame 2 about the axis X21.
  • a second end of the selector 5, opposite the first end 52, is equipped with a metal insert 54 whose section decreases away from the first end 52.
  • the metal insert 54 is intended to selectively position the read arms 17 and 18.
  • Note L5 the length of the selector 5, measured between the axis X21 and the free end of the metal insert 54, in a plane perpendicular to the direction Xc.
  • A5 denotes a radial axis of the selector 5 relative to the axis X21 and passing through the metal insert 54.
  • the selector 5 is equipped with a connecting element with the lamella 7, which consists of a tab 56 situated at a middle portion of the selector 5, on the side of the reading arm 18.
  • the tab 56 defines a housing 57 open towards the first end 52 of the selector 5.
  • S1 and S2 are rounded surfaces which define the opening of the housing 57.
  • l5 the width of the opening of the housing 57, measured between the rounded surfaces S1 and S2.
  • L1 is a measured length, in a plane perpendicular to the Xc direction, between the axis X21 and the contact area between the end 72 of the lamella 7 and the surfaces S1 and S2.
  • the length L1 corresponds approximately to a length measured between the axis X21 and the end 72 of the lamella 7.
  • the e7 is the thickness of the lamella 7, measured between its lateral faces 76 and 78. The thickness e7 is smaller to the width l5, preferably less than about 0.5 mm to this width.
  • the strip 7 is either in contact with the surface S1 or in contact with the surface S2, depending on its position.
  • playful engagement means a connection in which the slat 7 can be inserted or withdrawn freely from the housing 57 without forcing.
  • Another end 74 of the slat 7, opposite the end 72, is fixed to an assembly support 22 of the selection device 3.
  • the assembly support 22 is located in the extension of the selector 5, the opposite reading arms 17 and 18.
  • the axis X21 is closer to the end 74 of the strip 7 than the metal insert 54, which optimizes the architecture of the selection device 3.
  • the end 72 of the actuating element 7 is located, along the radial axis A5, between the axis X21 and the metal insert 54.
  • the assembly support 22 supports each of the selection devices 3 of the selection assembly 30.
  • each selector 5 is rotatable relative to the assembly support 22, which constitutes a support element of the selectors 5.
  • a spacer 23 is fixed to the assembly support 22 by means of a first screw 24.
  • the spacer 23 makes it possible to position the selector 5 in the direction Xc.
  • the selector 5 forms, with the spacer 23, a selector module S.
  • a pierced support 25 is threaded onto the rod of a second screw 26 and is located opposite the spacer 23 relative to the assembly support 22.
  • a portion 252 of the support 25 is glued to the end 74 of 7.
  • a spacer 27 makes it possible to ensure a satisfactory separation between the head of the second screw 26 and the assembly support 22, so as to prevent the support 25 from crushing the slat 7 when a user assembles the slats. aforementioned elements by means of the screw 26.
  • a wired electrical connection 19 is terminated by an electrical terminal 192 located on the fixed end 74 side of the lamella 7.
  • Two other electrical connections, hidden by the electrical connection 19 and similar to the electrical connection 19, are each provided with an electrical terminal and are also located on the side of the fixed end 74 of the lamella 7.
  • the control unit 100 is connected to the electrical connections 19 and equivalent and supplies the lamella 7 with electrical energy, through these links.
  • Each lamella 7 forms, with the support 25 to which it is bonded and the electrical connections 19, a piezoelectric selection module A.
  • the lamella 7 is of the bimorph piezoelectric lamella type, that is to say that it comprises two external active layers of crystalline gratings of equal capacity, separated by an insulating central layer carrying an array of electrodes.
  • the central layer is insulating and does not vary in length, the combined power supply of the two external crystal lattices makes it possible to join the active layers to create deformations of opposite signs, which causes a bending of the lamella 7 which is a function of the supply voltage.
  • the lamella 7 deforms in bending in a direction perpendicular to the direction Xc of the warp son, according to the arrow F7.
  • the bimorph design of the lamella 7 makes it possible to accentuate the geometry variation of the lamella 7, by varying the supply voltage difference of the two external crystal gratings.
  • the end 72 of the lamella 7 moves relative to the frame 2 as a function of the power supply of the lamella. In this sense, the end 72 is movable relative to the frame between two positions corresponding to two feed values of the lamella 7.
  • the first terminal 192 is permanently powered at a low voltage value, for example 0V.
  • the second terminal is permanently powered at a high voltage value, for example 60V.
  • the third terminal called the supply terminal of the lamella 7, is powered by a voltage whose value varies between two values between the high voltage value and the low voltage value, for example between 0V and 60V, depending on the desired deformation for the lamella 7.
  • the voltage control of the power supply terminal can be carried out in the form of a more or less softened slot, to go from a first voltage value to a second voltage value.
  • the actuation of the selector 5 of the dobby 1 is positive type, that is to say that each of the two positions of the selector 5 relative to the overall support 22 is controlled by a specific supply of the lamella 7, without spring.
  • the lamella deforms in flexion to occupy two positions.
  • the length L1 being smaller than the length L5 of the selector 5, the movement of the metal insert 54 is of greater amplitude than the bending movement of the lamella 7. This difference in length allows an amplification of the bending movement of the lamella 7.
  • the length L5 is at least twice the length L1.
  • the reading arms 17 and 18 are leveled by the pushers 19, as taught for example by the document EP-1 382 725 .
  • the selector 5 only has a role of maintaining in position one or the other of the reading arms 17 and 18, against the return forces exerted by one or other of the springs 172 or 182.
  • the selection set 30 shown in FIG. figure 4 shows the assembly support 22 which supports the shaft 21.
  • the assembly support 22 and the shaft 21 are common to all the selection devices 3 of the selection set 30 and are part of the selection set 30.
  • the position of the selectors 5 with respect to the slats 7 and the reading arms 17 and 18 associated is precisely controlled.
  • all the reading arms 17 and equivalents of dobby 1 can be articulated on a common shaft 28, and all the reading arms 18 and equivalents can also be articulated on a common shaft 29. This facilitates the mastery relative positioning of these elements.
  • a first end of the piezoelectric selection assembly 30 is attached to the frame 2 by a bracket 302 which extends the assembly support 22 in the Xc direction.
  • the other end of the selection assembly 30 is also attached to the frame 2 by another bracket, not shown.
  • each selector module S is placed around the shaft 21 and is held on the assembly support 22 by a first screw 24. Then, the blade 7 of each piezoelectric selection module A is placed in the housing 57 of the selector module S and the pierced support 25 of the piezoelectric selection module A is fixed to the assembly support 22 by a second screw 26.
  • the selector module S and the piezoelectric selection module A are pre-assembled on a common structure, the slat 7 being slid into the housing 57 of the selector 5.
  • the selector 5 is then engaged on the shaft 21 and the structure is secured to the assembly support 22.
  • the electrical connections of the piezoelectric selection modules A of the selection assembly 30, intended to be supplied by the high voltage value are electrically connected to so that these links are always at the same electrical potential.
  • the electrical connections of the piezoelectric selection modules A of the selection assembly 30, intended to be powered by the low voltage value are electrically connected, so that these links are always at the same electrical potential.
  • the third electrical connection is powered by a voltage whose value is between the high voltage value and the low voltage value. The power supply of the third electrical connection is specific to each piezoelectric selection module A.
  • the invention makes it possible, thanks to the design in selection modules S and actuation modules A, to replace only the defective piezoelectric selection module A.
  • a selection device according to the invention has a better reliability because it does not require a precise adjustment of an air gap at as the parts wear.
  • the contact problems that appear between a selector of the prior art and the pole of the electromagnet are removed thanks to the invention.
  • the slats 7 of all the actuating devices 3 are situated on the same side of the assembly support 22 in the direction Xc.
  • the lamellae 7 of two adjacent selection devices can be located on either side of the assembly support 22, which is advantageous in the case where the width l 7 of the lamellae 7 is greater than the division of .
  • the dobby 1 may comprise an actuating device 3 for each of the two reading arms 17 and 18. In this case, a strip 7 is necessary to actuate each arm of reading 17 and 18.
  • the coupling between the movement element of the connecting rod, in this case the eccentric, and the driving element can be of the lock type.
  • the dobby mechanism comprises a pair of locks controlled by two read arms.
  • the dobby may comprise only one rocking reading arm which interacts with the coupling member 15, in its two angular positions separated by a half-turn.
  • the selector sets a single read arm.
  • the selector is rotatable about an axis which is movable relative to a dobby frame, as taught for example in the document EP-A-0 851 047 .
  • FIGS 5 to 7 represent a second embodiment of the invention, in which the elements similar to those of the first embodiment bear the same numerical references, followed by the letter a.
  • a selector 5a is movable between two distinct positions in the direction Xc of the warp son.
  • a selection device 3a makes it possible to control one or the other of two reading arms 17a and 18a.
  • the selection device 3a comprises the selector 5a, mobile in rotation about an axis X21 fixed relative to a frame of a dobby and perpendicular to the direction Xc.
  • a first end 52a of the selector 5a is assembled to a box-shaped assembly support 22a, integral with the frame in which there is a piezoelectric strip 7a.
  • the selector 5a is equipped with two pins 50a, close to and parallel to the axis X21, between which is engaged play with a free end 72a of the blade 7a.
  • the other end 74a of the slat 7a is secured to the assembly support 22a and is held by a support 25a shown partially to reveal the geometry of the slat 7a and its attachment to the assembly support 22a.
  • the electrical connections for feeding the lamella 7a are not shown, and are each connected to one of the three electrical terminals 192a of the lamella 7a, located on the fixed end 74a side. Only two electrical terminals 192a are visible, the third being hidden by the support 25a.
  • a second end 54a of the selector 5a has a rectangular opening 51a, in which selectively engages one of the respective ends 176a or 186a of each arm 17a and 18a.
  • the assembly support 22a has a crenellated edge 220a.
  • the slots are arranged in the direction Xc.
  • the second end 54a of the selector 5a is disposed between two consecutive crenellations of the assembly support 22a.
  • the figure 8 represents a third embodiment of the invention, in which elements similar to those of the first embodiment bear the same references, followed by the letter c.
  • a selector 5c mobile in rotation about an axis X21, is actuated by a linear piezoelectric actuator 7c.
  • a first end 74c of the piezoelectric actuator 7c is articulated in rotation about an axis X74 with a support 22c fixed relative to a frame 2c of a dobby.
  • the other end 72c of the piezoelectric actuator 7c is articulated in rotation, about an axis X72, with the selector 5c.
  • A7 is a longitudinal axis of the piezoelectric actuator 7c.
  • the piezoelectric actuator 7c is in the form of a cylinder formed by a stack of piezoelectric ceramics which, when their power supply voltage varies, change geometry.
  • the piezoelectric ceramics lengthen in their longitudinal direction, that is to say along the axis A7, they retract in a transverse direction perpendicular to the axis A7.
  • the piezoelectric ceramics retract in their longitudinal direction, they elongate transversely.
  • the piezoelectric actuator 7c is said to be linear because in operation, when the supply voltage of the piezoelectric actuator 7c varies, its length L7 varies, which induces a displacement of the end 72c of the actuator 7c with respect to the support 22c, as indicated by the double arrow F7. This movement causes rotation of the selector 5c around the axis X21, as indicated by the double arrow F5, which allows the selector 5c to selectively push back the one or the other of the reading arm 17c or 18c.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
  • Transmission Devices (AREA)

Description

L'invention concerne un dispositif de sélection pour le contrôle d'une ratière de métier à tisser. L'invention concerne également une ratière contrôlée par un tel dispositif de sélection.The invention relates to a selection device for controlling a dobby of a loom. The invention also relates to a dobby controlled by such a selection device.

La présente invention a trait aux ratières pour la formation de la foule dans les machines à tisser, plus particulièrement aux dispositifs de sélection qui commandent l'actionnement de la ratière en fonction de l'armure à réaliser pour le tissu en cours de fabrication. Un cadre de lisses du métier à tisser est levé, ou baissé ou maintenu en position en fonction de la position qu'occupe sélectivement le dispositif de sélection associé.The present invention relates to dobbies for forming the shed in the weaving machines, more particularly to the selection devices which control the operation of the dobby according to the weave to be made for the fabric being manufactured. A heald frame of the loom is raised, lowered or held in position according to the position selectively occupied by the associated selection device.

EP-A-0 851 047 décrit un dispositif de sélection pour l'actionnement d'une ratière qui comprend un sélecteur pivotant destiné à actionner sélectivement l'un ou l'autre de deux organes basculants qui permettent d'actionner un des leviers de la ratière afin de lever ou baisser un des cadres de lisses. Un électroaimant assure la commande du dispositif de sélection et est piloté par un appareil de lisage. Le sélecteur pivotant porte une armature métallique, mobile en rotation par rapport au sélecteur. Une des extrémités de l'armature est en permanence à proximité d'un premier pôle de l'électroaimant, tandis que l'une autre extrémité de l'armature est mobile et peut s'éloigner ou se rapprocher d'un deuxième pôle de l'électro-aimant en fonction de l'alimentation électrique de l'électroaimant. Bien que donnant globalement satisfaction, ce dispositif de sélection est encombrant et d'architecture complexe, car il nécessite l'emploi d'un électroaimant et d'une armature métallique montée sur ressort qui sont de dimensions conséquentes. Ceci est désavantageux car les métiers à tisser comportent un nombre relativement élevé de ces dispositifs de sélection, pour actionner chacun des leviers de la ratière. EP-A-0 851 047 discloses a selection device for the actuation of a dobby which comprises a pivoting selector for selectively actuating one or the other of two rocking members which allow to actuate one of the levers of the dobby to raise or lower a smooth frames. An electromagnet controls the selection device and is controlled by a reading device. The pivoting selector carries a metal frame, movable in rotation relative to the selector. One end of the armature is permanently near a first pole of the electromagnet, while another end of the armature is movable and can move away from or approach a second pole of the armature. electromagnet according to the power supply of the electromagnet. Although giving overall satisfaction, this selection device is cumbersome and complex architecture because it requires the use of an electromagnet and a spring-loaded metal frame which are of significant dimensions. This is disadvantageous because the looms include a relatively large number of these selection devices, to operate each of the levers dobby.

WO-A-97/32066 divulgue un dispositif d'accouplement pour machine à tisser. Un cadre de lisses est attelé à une bielle associée à un excentrique monté autour d'un arbre. Un organe basculant et un levier sont connectés à l'excentrique. L'organe basculant et le levier sont actionnés respectivement par un sélecteur. Le sélecteur est actionné au moyen d'un dispositif d'actionnement. A la figure 8, ce dispositif d'actionnement est formé par un élément piézoélectrique piloté par un organe de commande. L'élément piézoélectrique est en prise avec le sélecteur, ce dernier étant fixé à l'organe basculant. Une extrémité de l'organe basculant est directement en prise avec une encoche de l'arbre principal de la ratière. Or, les éléments piézoélectriques sont des éléments fragiles et cette disposition entraine un risque de casse de l'élément piézoélectrique. L'extrémité de l'élément piézoélectrique est en prise directe avec le sélecteur. La déformation de l'élément piézoélectrique est donc égale au déplacement du sélecteur. L'amplitude du mouvement du sélecteur est ainsi limitée. WO-A-97/32066 discloses a coupling device for a weaving machine. A heald frame is hitched to a connecting rod associated with an eccentric mounted around a tree. A tilting member and a lever are connected to the eccentric. The tilting member and the lever are actuated respectively by a selector. The selector is actuated by means of an actuating device. To the figure 8 this actuating device is formed by a piezoelectric element controlled by a control member. The piezoelectric element is engaged with the selector, the latter being fixed to the rocker member. One end of the tilting member is directly engaged with a notch of the main shaft of the dobby. However, the piezoelectric elements are fragile elements and this arrangement causes a risk of breakage of the piezoelectric element. The end of the piezoelectric element is in direct contact with the selector. The deformation of the piezoelectric element is therefore equal to the displacement of the selector. The range of movement of the selector is thus limited.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant un dispositif de sélection pour le contrôle d'une ratière de métier à tisser, dont l'encombrement est réduit et dont l'architecture est simplifiée.It is to these drawbacks that the invention more particularly intends to remedy by proposing a selection device for controlling a dobby of a loom, whose size is reduced and whose architecture is simplified.

A cet effet, l'invention a pour objet un dispositif de sélection pour le contrôle d'une ratière positive rotative de métier à tisser, comprenant un sélecteur, destiné à positionner sélectivement au moins un organe basculant, en fonction de l'armure désirée pour le tissu en cours de fabrication, et un élément d'actionnement de nature piézoélectrique, permettant d'actionner le sélecteur. L'organe basculant commande au moins un organe d'accouplement. Le sélecteur est mobile en rotation par rapport à un élément de support qui supporte le sélecteur. Une première longueur, mesurée entre, d'une part, un axe de rotation du sélecteur par rapport à l'élément de support et, d'autre part, une extrémité du sélecteur, destinée à positionner sélectivement chaque organe basculant, est supérieure à une seconde longueur, mesurée entre, d'une part, l'axe de rotation du sélecteur et, d'autre part, une zone de contact entre une extrémité mobile de l'élément d'actionnement, destinée à actionner le sélecteur, et le sélecteur.For this purpose, the subject of the invention is a selection device for the control of a rotating positive loom of a loom, comprising a selector, intended to selectively position at least one rocker member, as a function of the armor desired for the fabric being manufactured, and an actuating element of piezoelectric nature, for operating the selector. The rocker member controls at least one coupling member. The selector is rotatable relative to a support member that supports the selector. A first length, measured between, on the one hand, an axis of rotation of the selector with respect to the support member and, on the other hand, an end of the selector, intended to selectively position each rocker member, is greater than one second length, measured between, on the one hand, the axis of rotation of the selector and, on the other hand, a contact zone between a movable end of the actuating element, intended to actuate the selector, and the selector .

Grâce à l'invention, chaque cadre de lisses est levé, baissé ou maintenu en position au moyen d'un élément d'actionnement de nature piézoélectrique dont l'encombrement est faible et dont la conception est simplifiée.Thanks to the invention, each heddle frame is raised, lowered or held in position by means of an actuating element of piezoelectric nature whose footprint is low and whose design is simplified.

L'organe basculant commande au moins un organe d'accouplement. Ainsi, l'élément piézoélectrique n'est pas en interaction directe avec un élément qui tourne avec l'arbre principal, ce qui permet de limiter les risques de casse de l'élément piézoélectrique. Le déplacement du sélecteur est amplifié par rapport au mouvement de l'élément d'actionnement, ce qui permet au sélecteur de se déplacer avec une amplitude de mouvement relativement importante, ce qui est avantageux pour le contrôle de certaines ratières.The rocker member controls at least one coupling member. Thus, the piezoelectric element is not in direct interaction with an element which rotates with the main shaft, which makes it possible to limit the risk of breakage of the piezoelectric element. The displacement of the selector is amplified relative to the movement of the actuating element, which allows the selector to move with a relatively large amplitude of movement, which is advantageous for the control of certain dodgings.

Selon des aspects avantageux mais non obligatoires de l'invention, un tel dispositif de sélection peut comporter une ou plusieurs des caractéristiques suivantes, prises dans toute combinaison techniquement admissible :

  • La première longueur est au moins deux fois supérieure à la seconde longueur.
  • L'axe de rotation du sélecteur est plus proche d'une extrémité fixe de l'élément d'actionnement que l'extrémité du sélecteur.
  • L'extrémité mobile de l'élément d'actionnement est située, le long d'un axe radial par rapport à un axe de rotation du sélecteur et passant par l'extrémité du sélecteur, entre l'axe de rotation du sélecteur et l'extrémité du sélecteur.
  • Lorsque l'alimentation en énergie électrique de l'élément d'actionnement varie, il se déforme dans une direction perpendiculaire à l'axe de rotation du sélecteur.
  • La largeur de l'élément d'actionnement, mesurée parallèlement à l'axe de rotation du sélecteur, est inférieure à 12 mm.
  • Le mouvement du sélecteur, pour le positionnement de chaque organe basculant, est limité par une butée.
  • Chaque butée est ménagée sur un des organes basculants.
  • Lorsque l'alimentation en énergie électrique de l'élément d'actionnement varie, l'élément d'actionnement se déforme en flexion.
  • Lorsque l'alimentation en énergie électrique de l'élément d'actionnement varie, sa longueur varie.
  • L'extrémité mobile de l'élément d'actionnement est engagée avec jeu dans un logement du sélecteur.
  • Chacune des positions du sélecteur par rapport à l'élément de support est commandée par une alimentation spécifique de l'élément d'actionnement, sans ressort de rappel.
According to advantageous but non-mandatory aspects of the invention, such a selection device may comprise one or more of the following characteristics, taken in any technically permissible combination:
  • The first length is at least twice the second length.
  • The axis of rotation of the selector is closer to a fixed end of the actuating element than the end of the selector.
  • The movable end of the actuating element is located, along a radial axis with respect to an axis of rotation of the selector and passing through the end of the selector, between the axis of rotation of the selector and the end of the selector.
  • When the electrical power supply of the actuating element varies, it deforms in a direction perpendicular to the axis of rotation of the selector.
  • The width of the actuating element, measured parallel to the axis of rotation of the selector, is less than 12 mm.
  • The movement of the selector, for the positioning of each rocker member, is limited by a stop.
  • Each stop is formed on one of the rocking members.
  • When the electrical power supply of the actuating element varies, the actuating element deforms in bending.
  • When the power supply of the actuating element varies, its length varies.
  • The movable end of the actuating element is engaged with play in a selector housing.
  • Each of the selector positions relative to the support member is controlled by a specific power supply of the actuating element, without return spring.

L'invention concerne également un ensemble de sélection pour le contrôle d'une ratière positive rotative de métier à tisser, comprenant plusieurs dispositifs de sélection tels que décrits ci-dessus, supportés chacun par un élément de support commun à tous les dispositifs de sélection.The invention also relates to a selection assembly for the control of a rotating positive loom of a loom, comprising a plurality of selection devices as described above, each supported by a support member common to all the selection devices.

Enfin, l'invention concerne une ratière positive rotative contrôlée par un tel dispositif de sélection.Finally, the invention relates to a rotating positive dobby controlled by such a selection device.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaîtront plus clairement à la lumière de la description qui va suivre d'un dispositif de sélection, d'une ratière et d'une machine à tisser conformes à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels :

  • la figure 1 est une vue de côté illustrant de manière schématique une lame de ratière conforme à l'invention ;
  • la figure 2 est une vue, à plus grande échelle, d'un dispositif de sélection appartenant à la ratière de la figure 1 ;
  • la figure 3 est une vue, à plus grande échelle, du détail III à la figure 2 ;
  • la figure 4 est une vue en perspective d'un ensemble de sélection, appartenant à la ratière de la figure 1, qui comprend plusieurs dispositifs de sélection ;
  • la figure 5 est une vue en perspective d'un dispositif de sélection conforme à un deuxième mode de réalisation de l'invention ;
  • la figure 6 est une coupe, à plus grande échelle, selon le plan VI à la figure 5, du dispositif de sélection de la figure 5 dans une première position ;
  • la figure 7 est une coupe, analogue à la figure 6, du dispositif de sélection de la figure 5 dans une deuxième position ; et
  • la figure 8 est une vue, semblable à la figure 2, d'un dispositif de sélection conforme à un troisième mode de réalisation de l'invention.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of a selection device, a dobby and a weaving machine in accordance with its principle, given only by way of example and with reference to the appended drawings in which:
  • the figure 1 is a side view illustrating schematically a dobby blade according to the invention;
  • the figure 2 is a view, on a larger scale, of a selection device belonging to the dobby of the figure 1 ;
  • the figure 3 is a view, on a larger scale, of detail III to figure 2 ;
  • the figure 4 is a perspective view of a selection set, belonging to the dobby of the figure 1 which comprises several selection devices;
  • the figure 5 is a perspective view of a selection device according to a second embodiment of the invention;
  • the figure 6 is a section, on a larger scale, according to plan VI to figure 5 , the selection device of the figure 5 in a first position;
  • the figure 7 is a cut, similar to the figure 6 , the selection device of the figure 5 in a second position; and
  • the figure 8 is a view, similar to the figure 2 , a selection device according to a third embodiment of the invention.

La figure 1 illustre schématiquement une lame de ratière positive rotative 1 appartenant à un métier à tisser M. On note Xc une direction des fils de chaîne d'un tissu en cours de fabrication. Le mécanisme de la ratière 1 est de construction connue et comprend, pour la manoeuvre de chacun des cadres de lisses 10 du métier M, un levier oscillant 11 qui est attelé à une bielle 12 à laquelle sont associés, d'une part, un excentrique 13 monté fou sur un arbre principal 14, animé d'un mouvement de rotation intermittent, et, d'autre part, un organe d'accouplement 15 fixé sur un plateau solidaire de l'excentrique 13, et mobile en rotation par rapport à ce plateau. La direction Xc est perpendiculaire aux plans dans lesquels s'effectue le mouvement des cadres de lisses 10. La liaison entre chaque levier 11 et le cadre 10 qu'il entraîne est assurée par une liaison par câbles et/ou bielles. Un ressort 154 tend à engager un bec 152 de l'organe d'accouplement 15 dans l'une ou l'autre de deux entailles 162 d'un entraîneur 16 solidaire de l'arbre 14, en assurant de la sorte la rotation de l'excentrique 13 et la mise en mouvement de la bielle 12. Ainsi, l'organe d'accouplement 15 est prévu pour l'accouplement sélectif en rotation de l'excentrique 13 qui constitue un élément de mise en mouvement de la bielle 12, avec l'élément d'entraînement 16.The figure 1 schematically illustrates a rotating positive dobby blade 1 belonging to a loom M. Xc denotes a direction of the warp son of a fabric being manufactured. The mechanism of the dobby 1 is of known construction and comprises, for the operation of each of the heddle frames 10 of the loom M, an oscillating lever 11 which is coupled to a connecting rod 12 to which are associated, on the one hand, an eccentric 13 mounted idle on a main shaft 14, driven by an intermittent rotational movement, and on the other hand, a coupling member 15 fixed to a plate secured to the eccentric 13, and rotatable relative to this tray. The direction Xc is perpendicular to the planes in which the movement of the heald frames 10 takes place. The connection between each lever 11 and the frame 10 which it drives is ensured by a connection by cables and / or connecting rods. A spring 154 tends to engage a spout 152 of the coupling member 15 in one or other of two notches 162 of a driver 16 integral with the shaft 14, thereby ensuring the rotation of the eccentric 13 and the setting in motion of the rod 12. Thus, the coupling member 15 is provided for the selective coupling in rotation of the eccentric 13 which constitutes a moving element of the connecting rod 12, with the driving element 16.

Pour la commande de l'organe d'accouplement 15 à l'encontre d'une force de rappel exercée par le ressort 154, il est prévu deux organes basculants qui consistent en deux bras de lecture 17 et 18 articulés en rotation, respectivement autour d'axes X17 et X18, fixes par rapport à un bâti 2 de la ratière 1. Une force de rappel F172, exercée par un ressort 172 accroché au bras de lecture 17, tend à repousser une extrémité 170 du bras de lecture 17 en direction de l'arbre 14, comme indiqué par la flèche F17 à la figure 1. De même, une force de rappel F182, exercée par un ressort 182 accroché au bras de lecture 18, tend à repousser une extrémité 180 du bras de lecture 18 en direction de l'arbre 14, contre le crochet 15, comme indiqué par la flèche F18. De cette manière, les ressorts 172 et 182 tendent à rappeler les bras de lecture 17 et 18 contre des poussoirs 19.For the control of the coupling member 15 against a restoring force exerted by the spring 154, there are two rocking members which consist of two read arms 17 and 18 articulated in rotation, respectively around X17 and X18 axes, fixed relative to a frame 2 of the dobby 1. A restoring force F172, exerted by a spring 172 attached to the reading arm 17, tends to push one end 170 of the reading arm 17 towards the shaft 14, as indicated by the arrow F17 at the figure 1 . Similarly, a restoring force F182, exerted by a spring 182 hooked to the reading arm 18, tends to push an end 180 of the reading arm 18 towards the shaft 14, against the hook 15, as indicated by the arrow F18. In this way, the springs 172 and 182 tend to recall the reading arms 17 and 18 against pushers 19.

Un dispositif de sélection 3 permet d'actionner le levier oscillant 11 de la ratière 1, par l'intermédiaire du mécanisme de la ratière 1, pour lever, baisser ou maintenir en position haute ou basse le cadre de lisses 10. Le dispositif de sélection 3 s'étend dans le prolongement des bras de lecture 17 et 18 et permet de positionner sélectivement l'un ou l'autre des bras de lecture 17 et 18, en fonction de l'armure désirée pour le tissu en cours de réalisation. Le dispositif de sélection 3 comprend un sélecteur 5 monobras en polymère et un élément d'actionnement de nature piézoélectrique qui consiste en une lamelle piézoélectrique 7. Comme l'indique la flèche F7, la lamelle 7 se déforme lorsqu'une unité de commande 100 fait varier son alimentation électrique. Le mouvement du sélecteur 5, représenté par la flèche F5, est provoqué par la déformation de la lamelle 7. On désigne par actionneur de nature piézoélectrique un organe monobloc contrôlable qui se déforme, lorsque son alimentation en énergie électrique varie, de manière à générer un déplacement d'une partie de cet organe par rapport à une autre partie. La lamelle 7 est disposée avec ses faces de plus grandes dimensions, c'est-à-dire ses faces latérales 76 et 78, orientées parallèlement à la direction Xc des fils de chaîne. En considérant la représentation de la figure 2, la face 76 est qualifiée de supérieure et la face 78 d'inférieure.A selection device 3 makes it possible to actuate the oscillating lever 11 of the dobby 1, via the mechanism of the dobby 1, in order to raise, lower or maintain in high or low position the frame of heddles 10. The selection device 3 extends in the extension of the reading arms 17 and 18 and selectively positions one or the other of the reading arms 17 and 18, depending on the armor desired for the fabric in progress. The selection device 3 comprises a single-sided polymer selector 5 and an actuating element of piezoelectric nature which consists of a piezoelectric lamella 7. As indicated by the arrow F7, the lamella 7 deforms when a control unit 100 makes vary its power supply. The movement of the selector 5, represented by the arrow F5, is caused by the deformation of the lamella 7. A piezoelectric actuator denotes a controllable monobloc member which deforms, when its power supply varies, so as to generate a moving a part of this body relative to another part. The lamella 7 is arranged with its larger faces, that is to say its lateral faces 76 and 78, oriented parallel to the Xc direction of the warp son. Considering the representation of the figure 2 , the face 76 is described as upper and the face 78 lower.

Comme le montre la figure 4, la ratière 1 comprend un ensemble de sélection 30 composé de plusieurs dispositifs de sélection 3, semblables à celui de la figure 1, qui contrôlent chacun un des leviers oscillants 11 de la ratière 1. A la figure 4, seuls deux bras de lecture 17 et 18 sont représentés, mais en pratique chaque dispositif de sélection 3 contrôle l'un ou l'autre de deux bras de lecture, semblables aux bras de lecture 17 et 18.As shown in figure 4 , the dobby 1 comprises a selection assembly 30 composed of several selection devices 3, similar to that of the figure 1 , which each control one of the oscillating levers 11 of the dobby 1. At the figure 4 , only two read arms 17 and 18 are shown, but in practice each selection device 3 controls one or the other of two reading arms, similar to the reading arms 17 and 18.

La largeur ℓ7 de la lamelle 7, mesurée selon la direction Xc des fils de chaîne, c'est-à-dire perpendiculairement au plan des figures 1 à 3, est inférieure ou égale à la division d du métier à tisser, représentée à la figure 4. La division d est une distance qui correspond à l'épaisseur de chaque cadre de lisses, parallèlement à la direction Xc. En pratique, la division d est environ égale à 12 mm.The width ℓ7 of the lamella 7, measured along the direction Xc of the warp threads, that is to say perpendicular to the plane of the Figures 1 to 3 , is less than or equal to division d of the loom, shown in figure 4 . The division d is a distance which corresponds to the thickness of each heald frame, parallel to the direction Xc. In practice, the division d is approximately equal to 12 mm.

La figure 2 montre plus en détail un des sélecteurs 5. Une première position du sélecteur 3, pour le positionnement du bras de lecture 17, est représentée en traits continus, tandis qu'une deuxième position du sélecteur 3, pour le positionnement du bras de lecture 18, est représentée en pointillés.The figure 2 shows in greater detail one of the selectors 5. A first position of the selector 3, for the positioning of the reading arm 17, is represented in continuous lines, while a second position of the selector 3, for the positioning of the reading arm 18, is represented in dotted lines.

Une première extrémité 52 du sélecteur 5 est alésée et est enfilée sur un arbre 21, solidaire du bâti 2, d'axe longitudinal X21 parallèle à la direction Xc. Le sélecteur 5 est mobile en rotation par rapport au bâti 2 autour de l'axe X21. Une deuxième extrémité du sélecteur 5, opposée à la première extrémité 52, est équipée d'un insert métallique 54 dont la section diminue en s'éloignant de la première extrémité 52. L'insert métallique 54 est destiné à positionner sélectivement les bras de lecture 17 et 18. On note L5, la longueur du sélecteur 5, mesurée entre l'axe X21 et l'extrémité libre de l'insert métallique 54, dans un plan perpendiculaire à la direction Xc.A first end 52 of the selector 5 is bored and is threaded onto a shaft 21, integral with the frame 2, of longitudinal axis X21 parallel to the direction Xc. The selector 5 is rotatable relative to the frame 2 about the axis X21. A second end of the selector 5, opposite the first end 52, is equipped with a metal insert 54 whose section decreases away from the first end 52. The metal insert 54 is intended to selectively position the read arms 17 and 18. Note L5, the length of the selector 5, measured between the axis X21 and the free end of the metal insert 54, in a plane perpendicular to the direction Xc.

On note A5 un axe radial du sélecteur 5 par rapport à l'axe X21 et passant par l'insert métallique 54.A5 denotes a radial axis of the selector 5 relative to the axis X21 and passing through the metal insert 54.

Le sélecteur 5 est équipé d'un élément de liaison avec la lamelle 7, qui consiste en une patte 56, située au niveau d'une portion médiane du sélecteur 5, du côté du bras de lecture 18.The selector 5 is equipped with a connecting element with the lamella 7, which consists of a tab 56 situated at a middle portion of the selector 5, on the side of the reading arm 18.

Comme représenté à la figure 3, la patte 56 définit un logement 57 ouvert en direction de la première extrémité 52 du sélecteur 5. On note S1 et S2 des surfaces arrondies qui définissent l'ouverture du logement 57. Lorsque la lamelle 7 se déforme, elle vient sélectivement au contact d'une zone de la surface S1 ou S2. On note ℓ5 la largeur de l'ouverture du logement 57, mesurée entre les surfaces arrondies S1 et S2.As represented in figure 3 the tab 56 defines a housing 57 open towards the first end 52 of the selector 5. S1 and S2 are rounded surfaces which define the opening of the housing 57. When the strip 7 is deformed, it comes into contact selectively with an area of the surface S1 or S2. We denote ℓ5 the width of the opening of the housing 57, measured between the rounded surfaces S1 and S2.

Une extrémité 72 de la lamelle 7 est insérée dans le logement 57. L'extrémité 72 constitue une extrémité mobile d'actionnement du sélecteur 5. On note L1 une longueur mesurée, dans un plan perpendiculaire à la direction Xc, entre l'axe X21 et la zone de contact entre l'extrémité 72 de la lamelle 7 et les surfaces S1 et S2. La longueur L1 correspond approximativement à une longueur mesurée entre l'axe X21 et l'extrémité 72 de la lamelle 7. On note e7 l'épaisseur de la lamelle 7, mesurée entre ses faces latérales 76 et 78. L'épaisseur e7 est inférieure à la largeur ℓ5, de préférence inférieure d'environ 0,5 mm à cette largeur. Cet engagement avec jeu de l'extrémité 72 de la lamelle 7 dans le logement 57 facilite le montage de la lamelle 7 dans le logement 57. De plus, ceci évite de précontraindre la lamelle 7, ce qui augmente sa durée de vie. Ainsi, la lamelle 7 est soit au contact de la surface S1, soit au contact de la surface S2, selon sa position.One end 72 of the lamella 7 is inserted into the housing 57. The end 72 constitutes a moving end of actuation of the selector 5. L1 is a measured length, in a plane perpendicular to the Xc direction, between the axis X21 and the contact area between the end 72 of the lamella 7 and the surfaces S1 and S2. The length L1 corresponds approximately to a length measured between the axis X21 and the end 72 of the lamella 7. The e7 is the thickness of the lamella 7, measured between its lateral faces 76 and 78. The thickness e7 is smaller to the width ℓ5, preferably less than about 0.5 mm to this width. This engagement with play of the end 72 of the lamella 7 in the housing 57 facilitates the mounting of the lamella 7 in the housing 57. In addition, this avoids preloading the lamella 7, which increases its life. Thus, the strip 7 is either in contact with the surface S1 or in contact with the surface S2, depending on its position.

On entend par engagement avec jeu une liaison dans laquelle la lamelle 7 peut être insérée ou retirée librement du logement 57 sans forcer.The term playful engagement means a connection in which the slat 7 can be inserted or withdrawn freely from the housing 57 without forcing.

Une autre extrémité 74 de la lamelle 7, opposée à l'extrémité 72, est fixée à un support d'ensemble 22 du dispositif de sélection 3. Le support d'ensemble 22 est situé dans le prolongement du sélecteur 5, à l'opposé des bras de lecture 17 et 18. L'axe X21 est plus proche de l'extrémité 74 de la lamelle 7 que l'insert métallique 54, ce qui optimise l'architecture du dispositif de sélection 3. Par ailleurs, l'extrémité 72 de l'élément d'actionnement 7 est située, le long de l'axe radial A5, entre l'axe X21 et l'insert métallique 54.Another end 74 of the slat 7, opposite the end 72, is fixed to an assembly support 22 of the selection device 3. The assembly support 22 is located in the extension of the selector 5, the opposite reading arms 17 and 18. The axis X21 is closer to the end 74 of the strip 7 than the metal insert 54, which optimizes the architecture of the selection device 3. Moreover, the end 72 of the actuating element 7 is located, along the radial axis A5, between the axis X21 and the metal insert 54.

Le support d'ensemble 22 supporte chacun des dispositifs de sélection 3 de l'ensemble de sélection 30. Ainsi, chaque sélecteur 5 est mobile en rotation par rapport au support d'ensemble 22, qui constitue un élément de support des sélecteurs 5.The assembly support 22 supports each of the selection devices 3 of the selection assembly 30. Thus, each selector 5 is rotatable relative to the assembly support 22, which constitutes a support element of the selectors 5.

Une entretoise 23 est fixée au support d'ensemble 22 au moyen d'une première vis 24. L'entretoise 23 permet de positionner le sélecteur 5 selon la direction Xc. Le sélecteur 5 forme, avec l'entretoise 23, un module sélecteur S.A spacer 23 is fixed to the assembly support 22 by means of a first screw 24. The spacer 23 makes it possible to position the selector 5 in the direction Xc. The selector 5 forms, with the spacer 23, a selector module S.

Un support percé 25 est enfilé sur la tige d'une deuxième vis 26 et est situé à l'opposé de l'entretoise 23 par rapport au support d'ensemble 22. Une portion 252 du support 25 est collée sur l'extrémité 74 de la lamelle 7. Une entretoise 27 permet d'assurer un écartement satisfaisant entre la tête de la deuxième vis 26 et le support d'ensemble 22, de manière à éviter que le support 25 n'écrase la lamelle 7 lorsqu'un utilisateur assemble les éléments précités au moyen de la vis 26.A pierced support 25 is threaded onto the rod of a second screw 26 and is located opposite the spacer 23 relative to the assembly support 22. A portion 252 of the support 25 is glued to the end 74 of 7. A spacer 27 makes it possible to ensure a satisfactory separation between the head of the second screw 26 and the assembly support 22, so as to prevent the support 25 from crushing the slat 7 when a user assembles the slats. aforementioned elements by means of the screw 26.

Lorsqu'elle est fixée sur le support d'ensemble 22, l'extrémité 74 est fixe par rapport au bâti 2.When fixed on the assembly support 22, the end 74 is fixed relative to the frame 2.

Une liaison électrique filaire 19 est terminée par une borne électrique 192 située du côté de l'extrémité fixe 74 de la lamelle 7. Deux autres liaisons électriques, cachées par la liaison électrique 19 et semblables à la liaison électrique 19, sont pourvues chacune d'une borne électrique et sont également situées du côté de l'extrémité fixe 74 de la lamelle 7. L'unité de commande 100 est reliée aux liaisons électriques 19 et équivalentes et alimente la lamelle 7 en énergie électrique, à travers ces liaisons.A wired electrical connection 19 is terminated by an electrical terminal 192 located on the fixed end 74 side of the lamella 7. Two other electrical connections, hidden by the electrical connection 19 and similar to the electrical connection 19, are each provided with an electrical terminal and are also located on the side of the fixed end 74 of the lamella 7. The control unit 100 is connected to the electrical connections 19 and equivalent and supplies the lamella 7 with electrical energy, through these links.

Chaque lamelle 7 forme, avec le support 25 sur lequel elle est collée et les liaisons électriques 19, un module de sélection piézoélectrique A.Each lamella 7 forms, with the support 25 to which it is bonded and the electrical connections 19, a piezoelectric selection module A.

La lamelle 7 est de type lamelle piézoélectrique de cintrage bimorphe, c'est-à-dire qu'elle comprend deux couches actives externes de réseaux cristallins d'égale capacité, séparées par une couche centrale isolante portant un réseau d'électrodes.The lamella 7 is of the bimorph piezoelectric lamella type, that is to say that it comprises two external active layers of crystalline gratings of equal capacity, separated by an insulating central layer carrying an array of electrodes.

Lorsqu'un des réseaux cristallins externes est sous tension, il se contracte ou s'allonge d'une valeur fonction de sa tension d'alimentation. Comme la couche centrale est isolante et ne varie pas en longueur, l'alimentation électrique combinée de l'un et l'autre des réseaux cristallins externes permet de solidariser les couches actives pour créer des déformations de signes opposés, ce qui provoque une flexion de la lamelle 7 qui est fonction de la tension d'alimentation. La lamelle 7 se déforme en flexion dans une direction perpendiculaire à la direction Xc des fils de chaîne, selon la flèche F7.When one of the external crystal lattices is energized, it contracts or lengthens by a value depending on its supply voltage. As the central layer is insulating and does not vary in length, the combined power supply of the two external crystal lattices makes it possible to join the active layers to create deformations of opposite signs, which causes a bending of the lamella 7 which is a function of the supply voltage. The lamella 7 deforms in bending in a direction perpendicular to the direction Xc of the warp son, according to the arrow F7.

La conception bimorphe de la lamelle 7 permet d'accentuer la variation de géométrie de la lamelle 7, en jouant sur la différence de tensions d'alimentation des deux réseaux cristallins externes.The bimorph design of the lamella 7 makes it possible to accentuate the geometry variation of the lamella 7, by varying the supply voltage difference of the two external crystal gratings.

Ainsi, l'extrémité 72 de la lamelle 7 se déplace par rapport au bâti 2 en fonction de l'alimentation de la lamelle en courant électrique. En ce sens, l'extrémité 72 est mobile par rapport au bâti entre deux positions correspondant à deux valeurs d'alimentation de la lamelle 7.Thus, the end 72 of the lamella 7 moves relative to the frame 2 as a function of the power supply of the lamella. In this sense, the end 72 is movable relative to the frame between two positions corresponding to two feed values of the lamella 7.

En fonctionnement, la première borne 192 est alimentée en permanence à une valeur de tension basse, par exemple 0V. La deuxième borne est alimentée en permanence à une valeur de tension haute, par exemple 60V. La troisième borne, dite borne d'alimentation de la lamelle 7, est alimentée par une tension dont la valeur varie entre deux valeurs comprises entre la valeur de tension haute et la valeur de tension basse, par exemple entre 0V et 60V, en fonction de la déformation souhaitée pour la lamelle 7. La commande en tension de la borne d'alimentation peut être réalisée sous la forme d'un créneau plus ou moins adouci, pour passer d'une première valeur de tension à une deuxième valeur de tension.In operation, the first terminal 192 is permanently powered at a low voltage value, for example 0V. The second terminal is permanently powered at a high voltage value, for example 60V. The third terminal, called the supply terminal of the lamella 7, is powered by a voltage whose value varies between two values between the high voltage value and the low voltage value, for example between 0V and 60V, depending on the desired deformation for the lamella 7. The voltage control of the power supply terminal can be carried out in the form of a more or less softened slot, to go from a first voltage value to a second voltage value.

L'actionnement du sélecteur 5 de la ratière 1 est de type positif, c'est-à-dire que chacune des deux positions du sélecteur 5 par rapport au support d'ensemble 22 est commandée par une alimentation spécifique de la lamelle 7, sans ressort de rappel. Ainsi, la lamelle se déforme en flexion pour occuper deux positions.The actuation of the selector 5 of the dobby 1 is positive type, that is to say that each of the two positions of the selector 5 relative to the overall support 22 is controlled by a specific supply of the lamella 7, without spring. Thus, the lamella deforms in flexion to occupy two positions.

La flexion de la lamelle 7, qui induit le déplacement de l'extrémité 72 qui reste engagée dans le logement 57 entre deux positions, provoque la rotation du sélecteur 5 autour de l'axe X21, selon l'un ou l'autre sens de la flèche F5. La longueur L1 étant plus faible que la longueur L5 du sélecteur 5, le mouvement de l'insert métallique 54 est de plus grande amplitude que le mouvement de flexion de la lamelle 7. Cette différence de longueur permet une amplification du mouvement de flexion de la lamelle 7. De préférence, la longueur L5 est au moins deux fois supérieure à la longueur L1.The flexion of the lamella 7, which induces the displacement of the end 72 which remains engaged in the housing 57 between two positions, causes the rotation of the selector 5 around the axis X21, according to one or the other direction of arrow F5. The length L1 being smaller than the length L5 of the selector 5, the movement of the metal insert 54 is of greater amplitude than the bending movement of the lamella 7. This difference in length allows an amplification of the bending movement of the lamella 7. Preferably, the length L5 is at least twice the length L1.

Lorsque l'insert 54 se déplace dans un premier sens, il vient au contact d'une surface S17 du bras de lecture 17, qui constitue une butée pour le mouvement du sélecteur 5 selon un premier sens de la flèche F5. Ceci permet de maintenir le bras de lecture 17 à l'encontre de la force de rappel F172 exercée par le ressort 172, dans une position où il n'actionne pas l'organe d'accouplement 15, lorsque celui-ci est en face, de manière à déplacer le levier oscillant 11. Le bras 18 est alors libre d'être déplacé à l'encontre de la force de rappel F182 du ressort 182. De même, lorsque l'insert 54 se déplace dans l'autre sens, il vient au contact d'une surface S18 du bras de lecture 18, qui constitue une butée pour le mouvement du sélecteur 5, selon l'autre sens de la flèche F5. Ceci permet de maintenir le bras de lecture 18 à l'encontre de la force de rappel F182 exercée par le ressort 182, dans une position où son extrémité n'actionne pas le crochet 15 lorsque celui-ci est en face, de manière à déplacer le levier oscillant 11. Le bras 17 est alors libre d'être déplacé à l'encontre de la force de rappel F172 du ressort 172.When the insert 54 moves in a first direction, it comes into contact with a surface S17 of the reading arm 17, which constitutes a stop for the movement of the selector 5 in a first direction of the arrow F5. This makes it possible to maintain the reading arm 17 against the restoring force F172 exerted by the spring 172, in a position where it does not actuate the coupling member 15 when it is opposite, so as to move the oscillating lever 11. The arm 18 is then free to be moved against the restoring force F182 of the spring 182. Similarly, when the insert 54 moves in the other direction, it comes into contact with a surface S18 of the reading arm 18, which constitutes a stop for the movement of the selector 5, in the other direction of the arrow F5. This makes it possible to keep the reading arm 18 against the restoring force F182 exerted by the spring 182, in a position where its end does not actuate the hook 15 when the latter is opposite, so as to move the swinging lever 11. The arm 17 is then free to be moved against the restoring force F172 of the spring 172.

Les bras de lecture 17 et 18 sont nivelés par les poussoirs 19, comme enseigné par exemple par le document EP-1 382 725 . Ainsi, le sélecteur 5 n'a qu'un rôle de maintien en position de l'un ou l'autre des bras de lecture 17 et 18, à l'encontre des efforts de rappel exercés par l'un ou l'autre des ressorts 172 ou 182.The reading arms 17 and 18 are leveled by the pushers 19, as taught for example by the document EP-1 382 725 . Thus, the selector 5 only has a role of maintaining in position one or the other of the reading arms 17 and 18, against the return forces exerted by one or other of the springs 172 or 182.

L'ensemble de sélection 30 représenté à la figure 4 montre le support d'ensemble 22 qui supporte l'arbre 21. Le support d'ensemble 22 et l'arbre 21 sont communs à tous les dispositifs de sélection 3 de l'ensemble de sélection 30 et font partie de l'ensemble de sélection 30. Ainsi, la position des sélecteurs 5 par rapport aux lamelles 7 et aux bras de lecture 17 et 18 associés est maitrisée précisément. De manière avantageuse, tous les bras de lecture 17 et équivalents de la ratière 1 peuvent être articulés sur un arbre commun 28, et tous les bras de lecture 18 et équivalents peuvent également être articulés sur un arbre commun 29. Ceci permet de faciliter la maitrise du positionnement relatif de ces éléments. Une première extrémité de l'ensemble de sélection piézoélectriques 30 est fixée au bâti 2 par une patte de fixation 302 qui prolonge le support d'ensemble 22 selon la direction Xc. L'autre extrémité de l'ensemble de sélection 30 est également fixée au bâti 2 par une autre patte de fixation, non représentée.The selection set 30 shown in FIG. figure 4 shows the assembly support 22 which supports the shaft 21. The assembly support 22 and the shaft 21 are common to all the selection devices 3 of the selection set 30 and are part of the selection set 30. Thus, the position of the selectors 5 with respect to the slats 7 and the reading arms 17 and 18 associated is precisely controlled. Advantageously, all the reading arms 17 and equivalents of dobby 1 can be articulated on a common shaft 28, and all the reading arms 18 and equivalents can also be articulated on a common shaft 29. This facilitates the mastery relative positioning of these elements. A first end of the piezoelectric selection assembly 30 is attached to the frame 2 by a bracket 302 which extends the assembly support 22 in the Xc direction. The other end of the selection assembly 30 is also attached to the frame 2 by another bracket, not shown.

Lors du montage de la ratière, chaque module sélecteur S est mis en place autour de l'arbre 21 et est maintenu sur le support d'ensemble 22 par une première vis 24. Puis, la lamelle 7 de chaque module de sélection piézoélectrique A est mise en place dans le logement 57 du module sélecteur S et le support percé 25 du module de sélection piézoélectrique A est fixé au support d'ensemble 22 par une deuxième vis 26.During assembly of the dobby, each selector module S is placed around the shaft 21 and is held on the assembly support 22 by a first screw 24. Then, the blade 7 of each piezoelectric selection module A is placed in the housing 57 of the selector module S and the pierced support 25 of the piezoelectric selection module A is fixed to the assembly support 22 by a second screw 26.

En variante non représentée, pour chaque dispositif de sélection 3, le module sélecteur S et le module de sélection piézoélectrique A sont prémontés sur une structure commune, la lamelle 7 étant glissée dans le logement 57 du sélecteur 5. Le sélecteur 5 est ensuite engagé sur l'arbre 21 et la structure est solidarisée au support d'ensemble 22. Ensuite, les liaisons électriques des modules de sélection piézoélectrique A de l'ensemble de sélection 30, destinées à être alimentées par la valeur de tension haute, sont reliées électriquement de sorte que ces liaisons sont toujours à un même potentiel électrique. De même, les liaisons électriques des modules de sélection piézoélectrique A de l'ensemble de sélection 30, destinées à être alimentées par la valeur de tension basse, sont reliées électriquement, de sorte que ces liaisons sont toujours à un même potentiel électrique. La troisième liaison électrique est alimentée par une tension dont la valeur est comprise entre la valeur de tension haute et la valeur de tension basse. L'alimentation électrique de la troisième liaison électrique est spécifique à chaque module de sélection piézoélectrique A.In a variant not shown, for each selection device 3, the selector module S and the piezoelectric selection module A are pre-assembled on a common structure, the slat 7 being slid into the housing 57 of the selector 5. The selector 5 is then engaged on the shaft 21 and the structure is secured to the assembly support 22. Next, the electrical connections of the piezoelectric selection modules A of the selection assembly 30, intended to be supplied by the high voltage value, are electrically connected to so that these links are always at the same electrical potential. Similarly, the electrical connections of the piezoelectric selection modules A of the selection assembly 30, intended to be powered by the low voltage value, are electrically connected, so that these links are always at the same electrical potential. The third electrical connection is powered by a voltage whose value is between the high voltage value and the low voltage value. The power supply of the third electrical connection is specific to each piezoelectric selection module A.

Lorsqu'une des lamelles 7 est défectueuse, l'invention permet, grâce à la conception en modules de sélection S et modules d'actionnement A, de ne remplacer que le module de sélection piézoélectrique A défectueux.When one of the lamellae 7 is defective, the invention makes it possible, thanks to the design in selection modules S and actuation modules A, to replace only the defective piezoelectric selection module A.

En comparaison avec un dispositif de sélection de l'art antérieur, dans lequel l'élément d'actionnement du sélecteur est un électroaimant, un dispositif de sélection selon l'invention a une meilleure fiabilité car il ne nécessite pas de régler précisément un entrefer au fur et à mesure de l'usure des pièces. De plus, les problèmes de contact qui apparaissent entre un sélecteur de l'art antérieur et le pôle de l'électroaimant sont supprimés grâce à l'invention.In comparison with a selection device of the prior art, in which the actuating element of the selector is an electromagnet, a selection device according to the invention has a better reliability because it does not require a precise adjustment of an air gap at as the parts wear. In addition, the contact problems that appear between a selector of the prior art and the pole of the electromagnet are removed thanks to the invention.

Comme le montre la figure 4, les lamelles 7 de tous les dispositifs d'actionnement 3 sont situées du même côté du support d'ensemble 22 selon la direction Xc. En variante non représentée, les lamelles 7 de deux dispositifs de sélection adjacents peuvent être situées de part et d'autre du support d'ensemble 22, ce qui est avantageux dans le cas où la largeur ℓ7 des lamelles 7 est supérieure à la division d.As shown in figure 4 the slats 7 of all the actuating devices 3 are situated on the same side of the assembly support 22 in the direction Xc. In a variant that is not shown, the lamellae 7 of two adjacent selection devices can be located on either side of the assembly support 22, which is advantageous in the case where the width ℓ 7 of the lamellae 7 is greater than the division of .

Dans un autre mode de réalisation de l'invention, non représenté, la ratière 1 peut comprendre un dispositif d'actionnement 3 pour chacun des deux bras de lecture 17 et 18. Dans ce cas, une lamelle 7 est nécessaire pour actionner chaque bras de lecture 17 et 18.In another embodiment of the invention, not shown, the dobby 1 may comprise an actuating device 3 for each of the two reading arms 17 and 18. In this case, a strip 7 is necessary to actuate each arm of reading 17 and 18.

Dans un autre mode de réalisation de l'invention, non représenté, l'accouplement entre l'élément de mise en mouvement de la bielle, en l'occurrence l'excentrique, et l'élément d'entraînement peut être de type à verrous, comme enseigné par exemple dans le document EP-A-1 845 181 . Dans ce cas, le mécanisme de la ratière comprend une paire de verrous contrôlés par deux bras de lecture.In another embodiment of the invention, not shown, the coupling between the movement element of the connecting rod, in this case the eccentric, and the driving element can be of the lock type. as taught for example in the document EP-A-1,845,181 . In this case, the dobby mechanism comprises a pair of locks controlled by two read arms.

En variante non représentée, la ratière peut ne comporter qu'un seul bras de lecture basculant qui interagit avec l'organe d'accouplement 15, dans ses deux positions angulaires séparées par un demi-tour. Dans ce cas, le sélecteur positionne un seul bras de lecture.In variant not shown, the dobby may comprise only one rocking reading arm which interacts with the coupling member 15, in its two angular positions separated by a half-turn. In this case, the selector sets a single read arm.

Dans une variante non représentée, le sélecteur est mobile en rotation autour d'un axe qui est mobile par rapport à un bâti de ratière, comme enseigné par exemple dans le document EP-A-0 851 047 .In a variant not shown, the selector is rotatable about an axis which is movable relative to a dobby frame, as taught for example in the document EP-A-0 851 047 .

Les figures 5 à 7 représentent un deuxième mode de réalisation de l'invention, dans lequel les éléments analogues à ceux du premier mode de réalisation portent les mêmes références numériques, suivies de la lettre a. Dans la suite, on décrit essentiellement les caractéristiques qui distinguent le deuxième mode de réalisation du premier mode de réalisation. En particulier, dans le deuxième mode de réalisation, un sélecteur 5a est mobile entre deux positions distinctes selon la direction Xc des fils de chaîne.The Figures 5 to 7 represent a second embodiment of the invention, in which the elements similar to those of the first embodiment bear the same numerical references, followed by the letter a. In the following, the characteristics which distinguish the second embodiment of the first embodiment are essentially described. In particular, in the second embodiment, a selector 5a is movable between two distinct positions in the direction Xc of the warp son.

Un dispositif de sélection 3a permet de contrôler l'un ou l'autre de deux bras de lecture 17a et 18a. Le dispositif de sélection 3a comprend le sélecteur 5a, mobile en rotation autour d'un axe X21 fixe par rapport à un bâti d'une ratière et perpendiculaire à la direction Xc. Une première extrémité 52a du sélecteur 5a est assemblée à un support d'ensemble 22a en forme de caisson, solidaire du bâti dans lequel se trouve une lamelle piézoélectrique 7a. Le sélecteur 5a est équipé de deux pions 50a, proches de et parallèles à l'axe X21, entre lesquels est engagée avec jeu une extrémité libre 72a de la lamelle 7a. L'autre extrémité 74a de la lamelle 7a est solidaire du support d'ensemble 22a et est maintenue par un support 25a représenté partiellement afin de laisser apparaitre la géométrie de la lamelle 7a et sa fixation au support d'ensemble 22a. Les liaisons électriques pour l'alimentation de la lamelle 7a ne sont pas représentées, et sont reliées chacune à une des trois bornes électriques 192a de la lamelle 7a, situées du côté de l'extrémité fixe 74a. Seules deux bornes électriques 192a sont visibles, la troisième étant cachée par le support 25a.A selection device 3a makes it possible to control one or the other of two reading arms 17a and 18a. The selection device 3a comprises the selector 5a, mobile in rotation about an axis X21 fixed relative to a frame of a dobby and perpendicular to the direction Xc. A first end 52a of the selector 5a is assembled to a box-shaped assembly support 22a, integral with the frame in which there is a piezoelectric strip 7a. The selector 5a is equipped with two pins 50a, close to and parallel to the axis X21, between which is engaged play with a free end 72a of the blade 7a. The other end 74a of the slat 7a is secured to the assembly support 22a and is held by a support 25a shown partially to reveal the geometry of the slat 7a and its attachment to the assembly support 22a. The electrical connections for feeding the lamella 7a are not shown, and are each connected to one of the three electrical terminals 192a of the lamella 7a, located on the fixed end 74a side. Only two electrical terminals 192a are visible, the third being hidden by the support 25a.

Une deuxième extrémité 54a du sélecteur 5a comporte une ouverture rectangulaire 51 a, dans laquelle s'engage sélectivement l'une des extrémités respectives 176a ou 186a de chaque bras 17a et 18a.A second end 54a of the selector 5a has a rectangular opening 51a, in which selectively engages one of the respective ends 176a or 186a of each arm 17a and 18a.

Le support d'ensemble 22a comporte un bord crénelé 220a. Les créneaux sont disposés selon la direction Xc. La deuxième extrémité 54a du sélecteur 5a est disposée entre deux créneaux consécutifs du support d'ensemble 22a.The assembly support 22a has a crenellated edge 220a. The slots are arranged in the direction Xc. The second end 54a of the selector 5a is disposed between two consecutive crenellations of the assembly support 22a.

Lorsque la lamelle 7a se déplace, elle se déforme en flexion et son extrémité libre 72a repousse l'un ou l'autre des pions 50a, ce qui fait tourner le sélecteur 5a autour de l'axe X21, comme indiqué par la flèche F5. Ainsi, l'extrémité libre 54a du sélecteur 5a vient buter contre l'un ou l'autre des créneaux.When the slat 7a moves, it deforms in bending and its free end 72a pushes one or the other of the pins 50a, which rotates the selector 5a about the axis X21, as indicated by the arrow F5. Thus, the free end 54a of the selector 5a abuts against one or other of the slots.

Dans une première position du sélecteur 5a, représentée à la figure 6, l'extrémité 176a du bras de lecture 17a est bloquée par le sélecteur 5a, tandis que l'extrémité 186a du bras de lecture 18a est alignée et s'engage dans l'ouverture du sélecteur 5a.In a first position of the selector 5a, shown in FIG. figure 6 the end 176a of the tonearm 17a is locked by the selector 5a, while the end 186a of the tonearm 18a is aligned and engages in the opening of the selector 5a.

Dans l'autre position du sélecteur 5a, représentée à la figure 7, l'extrémité 176a du bras de lecture 17a est alignée et s'engage dans l'ouverture 51 a du sélecteur 5a, tandis que l'extrémité 186a du bras de lecture 18a est bloquée par le sélecteur 5a. Ainsi, le mouvement du sélecteur 5a permet de contrôler sélectivement la position des bras de lecture 17a et 18a.In the other position of the selector 5a, shown in FIG. figure 7 the end 176a of the reading arm 17a is aligned and engages the opening 51a of the selector 5a, while the end 186a of the reading arm 18a is blocked by the selector 5a. Thus, the movement of the selector 5a selectively controls the position of the reading arms 17a and 18a.

La figure 8 représente un troisième mode de réalisation de l'invention, dans lequel les éléments analogues à ceux du premier mode de réalisation portent les mêmes références, suivies de la lettre c. Dans la suite, on décrit essentiellement les caractéristiques qui distinguent le troisième mode de réalisation du premier mode de réalisation. En particulier, dans le troisième mode de réalisation, un sélecteur 5c, mobile en rotation autour d'un axe X21, est actionné par un actionneur piézoélectrique linéaire 7c.The figure 8 represents a third embodiment of the invention, in which elements similar to those of the first embodiment bear the same references, followed by the letter c. In the following, the characteristics which distinguish the third embodiment of the first embodiment are essentially described. In particular, in the third embodiment, a selector 5c, mobile in rotation about an axis X21, is actuated by a linear piezoelectric actuator 7c.

Une première extrémité 74c de l'actionneur piézoélectrique 7c est articulée en rotation autour d'un axe X74 avec un support 22c fixe par rapport à un bâti 2c d'une ratière. L'autre extrémité 72c de l'actionneur piézoélectrique 7c est articulée en rotation, autour d'un axe X72, avec le sélecteur 5c. On note A7 un axe longitudinal de l'actionneur piézoélectrique 7c.A first end 74c of the piezoelectric actuator 7c is articulated in rotation about an axis X74 with a support 22c fixed relative to a frame 2c of a dobby. The other end 72c of the piezoelectric actuator 7c is articulated in rotation, about an axis X72, with the selector 5c. A7 is a longitudinal axis of the piezoelectric actuator 7c.

On note L7 la longueur de l'actionneur 7c, mesurée parallèlement à l'axe longitudinal A7 entre les axes X72 et X74.Note L7 the length of the actuator 7c, measured parallel to the longitudinal axis A7 between the axes X72 and X74.

L'actionneur piézoélectrique 7c se présente sous la forme d'un cylindre formé par un empilement de céramiques piézoélectriques qui, lorsque leur tension d'alimentation électrique varie, changent de géométrie. Lorsque les céramiques piézoélectriques s'allongent dans leur direction longitudinale, c'est-à-dire selon l'axe A7, elles se rétractent dans une direction transversale perpendiculaire à l'axe A7. A l'inverse, lorsque les céramiques piézoélectriques se rétractent dans leur direction longitudinale, elles s'allongent transversalement.The piezoelectric actuator 7c is in the form of a cylinder formed by a stack of piezoelectric ceramics which, when their power supply voltage varies, change geometry. When the piezoelectric ceramics lengthen in their longitudinal direction, that is to say along the axis A7, they retract in a transverse direction perpendicular to the axis A7. Conversely, when the piezoelectric ceramics retract in their longitudinal direction, they elongate transversely.

L'actionneur piézoélectrique 7c est dit linéaire car en fonctionnement, lorsque la tension d'alimentation de l'actionneur piézoélectrique 7c varie, sa longueur L7 varie, ce qui induit un déplacement de l'extrémité 72c de l'actionneur 7c par rapport au support 22c, comme indiqué par la double flèche F7. Ce mouvement provoque la rotation du sélecteur 5c autour de l'axe X21, comme indiqué par la double flèche F5, ce qui permet au sélecteur 5c de repousser sélectivement l'un ou l'autre des bras de lecture 17c ou 18c.The piezoelectric actuator 7c is said to be linear because in operation, when the supply voltage of the piezoelectric actuator 7c varies, its length L7 varies, which induces a displacement of the end 72c of the actuator 7c with respect to the support 22c, as indicated by the double arrow F7. This movement causes rotation of the selector 5c around the axis X21, as indicated by the double arrow F5, which allows the selector 5c to selectively push back the one or the other of the reading arm 17c or 18c.

Les caractéristiques des différents modes de réalisation décrits ci-dessus et de leurs variantes, peuvent être combinées entre elles pour donner lieu à d'autres modes de réalisation de l'invention.The characteristics of the various embodiments described above and their variants may be combined with one another to give rise to other embodiments of the invention.

Claims (14)

  1. A selection device (3; 3a; 3c) for controlling a positive rotary dobby (1) of a loom (M), comprising
    - a selector (5; 5a; 5c), intended to selectively position at least one tilting member (17, 18; 17a, 18a; 17c, 18c), depending on the desired graphic for the fabric during production, and
    - an actuating element (7; 7a; 7c) of a piezoelectric nature, making it possible to actuate the selector (5; 5a; 5c),
    said selection device (3; 3a; 3c) being characterized in that the tilting member (17, 18; 17a, 18a; 17c, 18c) controls at least one coupling member (15), in that the selector (5; 5a; 5c) can rotate relative to a support element (22 ; 22a ; 22c) that supports the selector (5; 5a; 5c), in that a first length (L5), measured between an axis of rotation (X21) of the selector (5; 5a; 5c) relative to the support element (22 ; 22a ; 22c), on the one hand, and an end (54 ; 54a ; 54c) of the selector (5; 5a; 5c), intended to selectively position each tilting member (17, 18 ; 17a, 18a; 17c, 18c), on the other hand, is larger than a second length (L1), measured between the axis of rotation (X21) of the selector (5 ; 5a ; 5c), on the one hand, and a contact zone (S1, S2) between a movable end (72 ; 72a ; 72c) of the actuating element (7; 7a; 7c), intended to actuate the selector (5; 5a; 5c), and the selector (5; 5a; 5c), on the other hand.
  2. The selection device (3 ; 3a ; 3c) according to claim 1, characterized in that the first length (L5) is at least twice as large as the second length (L1).
  3. The selection device (3 ; 3a ; 3c) according to one of claims 1 or 2, characterized in that the axis of rotation (X21) of the selector (5 ; 5a ; 5c) is closer to a fixed end (74 ; 74a ; 74c) of the actuating element (7 ; 7a ; 7c) than the end (54 ; 54a ; 54c) of the selector (5).
  4. The selection device (3; 3c) according to claim 1, characterized in that the movable end (72; 72c) of the actuating element (7; 7c) is situated, along a radial axis (A5) relative to the axis of rotation (X21) of the selector (5; 5c) and passing through the end (54, 54c) of the selector (5; 5c) between the axis of rotation (X21) of the selector (5; 5c) and the end (54; 54c) of the selector (5; 5c).
  5. The selection device (3) according to claim 1, characterized in that when the electricity supply of the actuator element (7) varies, it deforms in a direction perpendicular to the axis of rotation (X21) of the selector (5).
  6. The selection device (3) according to claim 1, characterized in that the width (ℓ7) of the actuating element (7; 7c), measured parallel to the axis of rotation (X21) of the selector (5; 5c), is smaller than 12 mm.
  7. The selection device (3; 3a; 3c) according to claim 1, characterized in that the movement (F5) of the selector (5 ; 5a ; 5c), for positioning each tilting member (17, 18; 17a, 18a; 17c, 18c), is limited by a stop (S17, S18; 220a; 17c, 18c).
  8. The selection device (3; 3c) according to claim 7, characterized in that each stop (S17, S18) is formed on one of the tilting members (17, 18; 17c, 18c).
  9. The selection device (3; 3a) according to claim 1, characterized in that when the electrical power supply of the actuating element (7; 7a) varies, the actuating element (7; 7a) deforms by bending (F7).
  10. The selection device (3c) according to claim 1, characterized in that, when the electrical power supply of the actuating element (7c) varies, its length (L7) varies.
  11. The selection device (3) according to claim 1, characterized in that the movable end (72) of the actuating element (7) is engaged with clearance in a housing (57) of the selector (5).
  12. The selection device (3; 3a; 3c) according to claim 1, characterized in that each of the positions of the selector (5; 5a; 5c) is controlled by a specific power supply of the actuating element (7; 7a; 7c), without return spring.
  13. A selection assembly (30) for controlling a positive rotary dobby (1) of a loom (M), characterized in that it comprises several selection devices (3 ; 3a ; 3c) according to claim 1, the selection devices (3 ; 3a ; 3c) being supported by a support element (22 ; 22a ; 22c) shared by all of the selection devices (3 ; 3a ; 3c).
  14. A positive rotary dobby (1) controlled by a selection device (3; 3a; 3c) according to claim 1.
EP11191915.5A 2010-12-06 2011-12-05 Selection device for controlling a dobby, selection unit and dobby controlled by such a selection device Active EP2460918B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1060109A FR2968317A1 (en) 2010-12-06 2010-12-06 SELECTION DEVICE FOR CONTROLLING A RATIERE, SELECTION ASSEMBLY AND RATIERE CONTROLLED BY SUCH A SELECTION DEVICE

Publications (2)

Publication Number Publication Date
EP2460918A1 EP2460918A1 (en) 2012-06-06
EP2460918B1 true EP2460918B1 (en) 2013-06-26

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Application Number Title Priority Date Filing Date
EP11191915.5A Active EP2460918B1 (en) 2010-12-06 2011-12-05 Selection device for controlling a dobby, selection unit and dobby controlled by such a selection device

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EP (1) EP2460918B1 (en)
CN (1) CN102534918B (en)
FR (1) FR2968317A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1251107B (en) * 1991-07-25 1995-05-04 Costantino Vinciguerra REFINEMENTS IN A HIGH-SPEED ROTARY DOBBY
JP2000507310A (en) * 1996-02-28 2000-06-13 クライナー、エルンスト Coupling device for loom and dobby having coupling device
FR2757884B1 (en) * 1996-12-31 1999-02-19 Staubli Sa Ets ELECTROMAGNETIC SELECTION ACTUATION DEVICE FOR THE CONTROL OF STRIPES AND OTHER WEAVING MECHANICS
FR2842538B1 (en) * 2002-07-16 2004-10-29 Staubli Sa Ets ROTARY RATIERE FOR WEAVING, AND WEAVING EQUIPMENT PROVIDED WITH SUCH A RAIL
ITMI20022152A1 (en) * 2002-10-10 2004-04-11 Fimtextile Spa DEVICE TO IMPLEMENT THE PROGRAMMING OF ROTARY DOBBIES FOR WEAVING MACHINES CONTAINING PERFECTED LINEAR ELECTRIC MOTOR CONTROL VEHICLES
FR2899602B1 (en) 2006-04-11 2008-05-23 Staubli Faverges Sca ROTARY RATIERE, WEAVING COMPRISING SUCH A REAL ESTATE AND METHOD OF CONTROLLING SUCH REAL ESTATE
FR2910494B1 (en) * 2006-12-21 2009-01-30 Staubli Faverges Sca ELECTRO-MAGNETIC BLOCK AND DEVICE FOR ELECTROMAGNETIC SELECTION OF THE MOVEMENT OF RAIN BLADES AND OTHER MECHANICAL MECHANICAL FORMATION OF THE CROWD
EP2014805B1 (en) * 2007-07-12 2011-12-14 Groz-Beckert KG Control device for the coupling of a dobby

Also Published As

Publication number Publication date
EP2460918A1 (en) 2012-06-06
CN102534918B (en) 2014-10-29
CN102534918A (en) 2012-07-04
FR2968317A1 (en) 2012-06-08

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