EP4219813A1 - Shedding assembly for a loom and its adjustment method - Google Patents

Abstract

Shedding assembly with a shedding machine (2) comprising an eccentric system (30), defining an eccentric center distance (R1), a first connecting rod (40), actuated by the eccentric system to actuate a first lever (50) and defining a connecting rod center distance (R2), and a second connecting rod (60), securing the pivoting of the first lever with that of a second lever (70) to actuate a heddles (11). To facilitate adjustment, the shedding machine (2) comprises an adjustment system, which allows at least one adjustment configuration where one of the center distances (R1, R2) is adjustable, as well as a follower member (120) fitted to the second connecting rod (60). The shedding assembly includes a flap (101) for moving the second connecting rod by driving the follower member, to adjust the center distance when the adjustment system is in the adjustment configuration.

Description

The present invention relates to a shedding assembly, a loom comprising such a shedding assembly, and an adjustment method.

The invention relates to the technical field of shed-forming machines of the rod-to-frame actuator type, for a weaving loom with heald frames.

It is known practice to employ a plurality of electric actuators on the frame to drive heddle frames into vertical oscillations. Depending on the technology used, electric actuators produce oscillating rotation or continuous rotation. In both cases, each electric actuator drives the corresponding heald frame through a pulling mechanism, comprising a crank pin, connecting rods and levers, which transform the rotation produced by the actuator into an alternative translation of the frame. of heddles. During the use of the loom, in particular for a change of article, it may prove necessary to adjust the amplitude and the height of the stroke of the heddle frame. Modifying the amplitude amounts to modifying the opening angle of the shed of the warp yarns. Modifying the height amounts to modifying the height of the crossing of the layers of warp threads.

FR2734610A1 describes a shedding device, where a heddle frame actuating lever is connected to the connecting rod-crank system via an adapter or yoke, the position of which is manually adjustable, along an arm belonging to the lever and which can be immobilized using a clamping screw. However, adjusting this type of system by hand can be tedious and difficult to precise.

EP3481977A1 describes a shedding machine with heddle frame operating mechanisms. Each actuating mechanism comprises two levers, one of which is actuated by a coupling rod, coupled to the lever via a clip to allow adjustment. The machine also includes a blocking device, with blocking elements. Each blocking element is assigned to a single drive mechanism, being movable between a weaving position and a blocking position. In the blocking position, the movement of the lever of the drive mechanism concerned is prevented beyond an adjustment position. Thus, in the locking position, the levers are positioned at positions which facilitate access to the staples to allow adjustment of the shedding amplitude by acting on the staples. However, despite this preliminary step of positioning the levers to shift the staples, adjusting this type of system by hand can prove to be tedious and difficult to be precise.

DE102008032718B3 describes a shedding device where the eccentricity of an eccentric device is adjustable, by moving an eccentric disc connecting rod drive, relative to a connection element, which is itself rotated by the actuator. The adjustment is made manually using an adjustment rod. A disadvantage of this type of adjustment is that the adjustable parts can be difficult to access, that a high number of screwing or unscrewing steps is necessary for adjustment, and that a high level of qualification is required to carry out the adjustment. .

The invention aims to remedy the drawbacks of the prior art by proposing a new assembly for forming the shed for which the adjustment of the stroke in alternating translation of the heald frame is facilitated.

The subject of the invention is a shed-forming assembly, which comprises at least one shed-forming machine, for actuating a frame of heddles of a loom according to an alternating translation stroke, along a frame axis , said at least one shedding machine comprising: a rotary electric actuator; an actuator controller capable of controlling the rotary electric actuator and an eccentric system. The eccentric system comprises: a base through which the eccentric system is driven in rotation by the rotary electric actuator, around a main axis perpendicular to the frame axis, and a connecting piece defining an axis of eccentric, the eccentric axis being parallel to the main axis. Said at least one shedding machine comprises a first lever, which is pivotable about a first lever axis to actuate said heald frame, the first lever axis and the main axis being parallel; a second lever, which is pivotable about a second lever axis to actuate said heald frame, the second lever axis and the main axis being parallel; and a first connecting rod. The first connecting rod comprises: a first articulation end, via which the first connecting rod is coupled to the connecting piece, so that the eccentric system and the first connecting rod are pivotable with respect to each other about the eccentric axis, the eccentric axis and the main axis being separated by an eccentric center distance, and a second articulation end, via which the first connecting rod is coupled to the first lever, so that the first lever and the first connecting rod are pivotable with respect to each other about a connecting rod axis, which is parallel to the main axis, the connecting rod axis and the eccentric axis being separated by a connecting rod center distance. Said at least one shedding machine comprises a second connecting rod, which is coupled to the first lever and to the second lever, to subject the pivoting of the second lever to the pivoting of the first lever.

According to the invention, said at least one shedding machine comprises: an adjustment system, which comprises locking means and which allows at least an adjustment configuration, among: an amplitude adjustment configuration, in which the locking means allow movement of the connecting piece relative to the base so that the eccentric center distance is adjustable, and a configuration height adjustment, wherein the locking means allow movement of the second end of articulation relative to the first end of articulation so that the connecting rod center distance is adjustable. The adjustment system also allows a locked configuration, in which the eccentric center distance and the connecting rod center distance are fixed, in that the locking means are configured so that the connecting piece is integral with the base and so that the first hinge end is integral with the second hinge end. According to the invention, said at least one shed-forming machine comprises a follower member, which equips the second connecting rod. According to the invention, the shedding assembly comprises a shutter, which is configured to move the second connecting rod of said at least one shedding machine by driving the follower member, in order to adjust the distance d eccentric center distance, in the case where the adjustment system is in amplitude adjustment configuration, and to adjust the connecting rod center distance, in the case where the adjustment system is in height adjustment configuration.

An idea underlying the invention is to provide that, when the shedding machine is in the adjustment configuration, a modification of the adjustment is obtained by a displacement of the second connecting rod under the action of the flap, the flap thereby driving the follower member. In particular, in the case where the adjustment system is in the amplitude adjustment configuration, provision is advantageously made for the connecting rod center distance to be fixed and for the base to be immobilized in rotation, so that a displacement of the second connecting rod by the flap leads to a modification of the orientation of the base of the eccentric system around the main axis, corresponding to a modification of the eccentric center distance. In particular, in the case where the adjustment system is in height adjustment configuration, provision is advantageously made for the eccentric center distance to be fixed and for the base to be immobilized in rotation, so that a displacement of the second connecting rod by the flap causes a change in the value of the connecting rod center distance. In both cases, it is particularly easy to automate the adjustment of the crowd parameters, by automating the flap.

The invention applies to the case where the machine has an amplitude adjustment configuration, to the case where the machine has a height adjustment configuration, and to the case where the machine has both an amplitude adjustment configuration and a height adjustment configuration. The invention applies to a machine for forming the shed that includes a shed height adjustment system, or a shed amplitude adjustment system, or both.

Preferably, several shed-forming machines are provided, each to actuate a respective heald frame, the shutter being configured to move the second connecting rods belonging respectively to the shed-forming machines by driving the follower members fitted to said second connecting rods.

Preferably, the second connecting rods of the shedding machines are mounted side by side parallel to the main axis; and the flap extends parallel to the first lever axis, from one of the second connecting rods to another of the second connecting rods, to drive at least one of the follower members equipping respectively one and the other of the second connecting rods, in adjustment configuration of the adjustment system.

Preferably, the shutter is pivotable around a pilot axis parallel to the main axis, to move the second connecting rod by driving the follower member of said at least one shedding machine.

Preferably, the shedding assembly comprises: a shutter actuator, which is configured to actuate the shutter in pivoting around the steering axis; and a shutter controller, configured to control the shutter actuator.

Preferably, the follower member of said at least one shedding machine comprises: a guide profile, which is convex in a connecting rod plane, perpendicular to the first lever axis, the flap bearing against the guiding, at different bearing points of the guiding profile depending on the orientation of the flap, to drive the follower member; and a foot, through which the follower member is integral with the second connecting rod, the foot defining a clearance profile to receive a distal edge of the flap when the flap bears against the guide profile, the clearance profile being concave in the connecting rod plane and extending between the guide profile and the second connecting rod.

Preferably, the flap is movable between: a working position, adopted in adjustment configuration, where the flap bears against the follower member in a retaining direction, to retain the second connecting rod by means of the follower member follower, against forces applied by the heddle frame by gravity on the first lever and on the second lever, tending to move the second connecting rod in the opposite direction to the retaining direction; and a release position, adopted in the locked configuration, which is reached by moving the flap in the direction opposite to the retaining direction from the working position.

Preferably, so that the eccentric center distance is adjustable when the adjustment system is in the amplitude adjustment configuration, the connecting piece is movable in translation relative to the base, along a translation axis which is perpendicular to the main axis.

Preferably, the base comprises at least one sliding surface parallel to the translation axis, via which the base guides the translation of the connecting piece along the translation axis while fixing the rotation of the piece link, when the adjustment system is in the amplitude adjustment configuration.

Preferably, the base comprises a sliding lug forming two sliding surfaces, which are directed away from each other. Preferably, the connecting piece comprises a fork forming two sliding arms, which are parallel to the translation axis and which receive the sliding pin between them, so that each sliding arm slides respectively along the one of the two sliding surfaces. Preferably, the locking means comprise a tightening screw, which: in the locked configuration of the adjustment system, is in a position for tightening the sliding arms of the fork on the sliding lug, to secure the connecting piece with the base, and which, in the amplitude adjustment configuration of the adjustment system, is in a position for releasing the sliding arms on the lug, to allow the translation of the connecting piece with respect to the base.

Preferably, the locking means comprise a clamping screw and a clamping nut, which are coaxial with the main axis. Preferably, the connecting piece comprises a flange, which extends perpendicularly to the main axis and which comprises an oblong orifice, the oblong orifice being elongated along the axis of translation and receiving the nut. Preferably, the flange is clamped axially against the base by tightening the clamping nut on the clamping screw, to secure the connecting piece to the base when the adjustment system is in the locked configuration.

Preferably, said at least one shedding machine comprises a blocking system, which allows a blocking configuration, where the blocking system immobilizes the base in a reference orientation around the main axis, and a blocking configuration. release, where the locking system allows the base to pivot around the main axis.

Preferably, the first connecting rod comprises a first connecting rod end, carrying the first articulation end, and a second connecting rod end, carrying the second articulation end, the first connecting rod end and the second connecting rod end being slidably fitted relative to each other along a sliding axis, so that the connecting rod center distance is adjustable.

Preferably, the follower member comprises a follower finger, which is integral with the second connecting rod and projects from the second connecting rod perpendicularly to the second connecting rod and to the main axis.

The invention also relates to a weaving loom, comprising the assembly for forming the shed defined above, as well as at least one frame of healds actuated according to the stroke in alternating translation along the axis of the frame by said at least one crowd-forming machine.

The invention also relates to an adjustment method, for adjusting said at least one shed-forming machine belonging to the assembly for forming the shed as defined above, the adjustment method successively comprising: a step putting the adjustment system in adjustment configuration; in the case where the adjustment system is in the amplitude adjustment configuration, a step of adjusting the eccentric center distance, by driving the follower member by means of the flap, moving the second connecting rod, and, in the case where the adjustment system is in the height adjustment configuration, a step of adjusting the connecting rod center distance, by driving the follower member by means of the flap, moving the second connecting rod; and a step of placing the adjustment system in the locked configuration.

Preferably, the adjustment method comprises, prior to the step of placing the adjustment system in the adjustment configuration, a step of moving the shutter to the working position.

Preferably, the adjustment method comprises: before the step of moving the shutter to the working position, a step of pivoting the base to the reference orientation, then a step of blocking the base in the reference orientation, by placing the locking system in the blocking configuration; and after the step of placing the adjustment system in the locked configuration, a step of authorizing the pivoting of the base, by placing the locking system in the release configuration.

Preferably, when the base is in the reference orientation, the eccentric system and the first connecting rod are positioned so that the main axis, the eccentric axis and the connecting rod axis are coplanar and arranged successively in this order.

Preferably, when the base is in the reference orientation, the eccentric system and the first connecting rod are positioned so that the eccentric axis, the main axis and the connecting rod axis are coplanar and arranged successively in this order.

Preferably, the method comprises a selection step, in which: the follower member of the shedding machine for which the step of setting the adjustment configuration is going to be carried out, is moved to a position of docking in which the flap is capable of driving the follower member, the displacement of the follower member to the docking position being obtained by displacement of the second connecting rod under the action of the rotary electric actuator of this machine crowd building; and the follower member of another shedding machine, for which the adjustment system will be in the locked configuration during the step of placing it in the adjustment configuration, is moved to a disengaged position so as not to be driven by the flap, the movement of the follower member to the release position being obtained by movement of the second connecting rod under the action of the rotary electric actuator of said other machine for forming the shed.

Preferably, in particular during the selection step, the second connecting rod of said shedding machine, for which the step of setting the adjustment configuration is going to be carried out, is actuated by the rotary electric actuator of said shedding machine. shedding machine until the main axis, the eccentric axis and the connecting rod axis of said shedding machine are coplanar. Preferably, in particular during the selection step, the second connecting rod of said other shedding machine is actuated by the rotary electric actuator of said other shedding machine until the main axis, the eccentric axis and the connecting rod axis of said other shedding machine are coplanar and arranged in a successive order where the eccentric axis and the connecting rod axis are inverted, with respect to the eccentric pin and the connecting rod pin of said shedding machine for which the adjustment configuration step is going to be carried out.

Preferably, the follower member is placed in the docking position by placing the base in reference orientation. Preferably, the follower member is placed in the release position by placing the base in the release orientation. Preferably, when the base is in the release orientation, the eccentric system and the first connecting rod are positioned so that the main axis, the eccentric axis and the connecting rod axis are aligned in the same order as when the base is in the reference orientation, except that the main axis and the eccentric axis are interchanged.

Preferably, during the drive of the follower member by means of the flap, the flap is continuously held in abutment against the follower member in the retaining direction, against the forces applied by the frame of healds tending to move the second connecting rod in the opposite direction to the retaining direction.

Preferably, the adjustment system comprises adjustment stops, among: amplitude adjustment stops and height adjustment stops. The amplitude adjustment stops limiting the movement of the connecting piece to limit the variation of the eccentric center distance distance between a predetermined minimum eccentric center distance value and a maximum eccentric center distance value, in the case where the adjustment system can be put in the amplitude adjustment configuration. The height adjustment stops limit the movement of the second articulation end in order to limit the variation of the connecting rod center distance distance between a predetermined minimum connecting rod center distance value and a maximum connecting rod center distance value, in the case the adjustment system can be put in the height adjustment configuration.

Preferably, the adjustment method comprises a locking control step, carried out after the step of placing the adjustment system in the locked configuration and before the step of authorizing the pivoting of the base. The locking control step includes a step of verifying that the shutter actuator does not rotate under the application of a predetermined torque value; and a step of issuing an alarm signaling a locking fault in the event that a rotational movement of the shutter actuator is detected.

Preferably, the adjustment method includes an unlocking control step, carried out after the step for authorizing the pivoting of the base. The unlocking control step includes a step of verifying that the rotary electric actuator rotates under the application of a predetermined torque value; and a step of issuing an alarm signaling an unlocking fault in the event that it is established that the rotary electric actuator has not rotated.

Preferably, during the step of moving the shutter to the working position, the first connecting rod is parallel to the axis of translation.

Preferably, the method comprises a step of controlling the motor torque of the shutter actuator during the step of moving the shutter to the working position.

Preferably, the adjustment method comprises cutting off an electric power supply to the rotary electric actuator during the step of setting the adjustment configuration.

Preferably, the adjustment method comprises a prior control step, carried out after the step of placing the adjustment system in the adjustment configuration and before the adjustment step, the prior control step comprising a rotation control step of the shutter actuator, until the adjustment system reaches an adjustment stop; a step of measuring an angle of rotation described by the flap actuator, the adjustment system having reached the adjustment stop; a step of comparing the measured angle of rotation with a predetermined angle corresponding to the foreseeable rotation according to the position of the adjustment stopper to establish whether the shedding machine is in a nominal situation or in a situation of fault, such as a loosening fault or an adjustment fault; and a step of issuing an alarm, in the event that it has been determined that the shedding machine is in the fault condition.

• La figure 1 est une vue en perspective partielle d'un métier à tisser équipé d'un ensemble de formation de la foule comprenant quatre machines de formation de la foule, selon un premier mode de réalisation de l'invention.
• La figure 2 est une vue en perspective, sous un autre angle, d'une partie du métier à tisser de la figure 1, où une seule des machines de formation de la foule est montrée.
• La figure 3 est une coupe longitudinale partielle d'une bielle appartenant à la machine de formation de la foule des figures précédentes.
• La figure 4 montre deux vues en perspective d'un système excentrique appartenant à la machine de formation de la foule des figures précédentes, dans des configurations différentes.
• La figure 5 montre une partie seulement du système excentrique de la figure 4.
• La figure 6 est une vue de face d'un dispositif de réglage, où un volet est dans une position de dégagement.
• La figure 7 est une vue similaire à celle de la figure 7, où le volet est dans une position de référence.
• La figure 8 est une vue en coupe de la machine de formation de la foule des figures 2 à 7, montrant notamment un système de blocage.
• La figure 9 est une vue en perspective de dos de l'actionneur de la figure 8.
• La figure 10 montre deux vues de face partielles 10A et 10B des mêmes éléments que sur la figure 2, en configuration de réglage d'amplitude.
• La figure 11 montre deux vues de face partielles 11A et 11B des mêmes éléments que sur la figure 2, en configuration de réglage de hauteur.
• La figure 12 est un schéma bloc d'un procédé de réglage conforme à l'invention.
• La figure 13 est une vue en perspective d'un système excentrique, appartenant à un métier à tisser selon un deuxième mode de réalisation de l'invention.
• La figure 14 est une vue en coupe du système excentrique de la figure 13, avec le système excentrique à un réglage différent.
• La figure 15 est une vue en coupe de l'une des machines de formation de la foule appartenant au métier à tisser des figures 13 et 14, montrant notamment un système de blocage.
• La figure 16 est une vue en perspective d'un système excentrique, appartenant à un métier à tisser selon un troisième mode de réalisation de l'invention.
• La figure 17 est une vue en perspective d'un dispositif de réglage selon un autre mode de réalisation de l'invention où un quart inférieur d'un disque de commande du dispositif de réglage a été omis.
• La figure 18 est une vue partielle du dispositif de réglage de la figure 17 en configuration de réglage où un volet est dans une position de travail correspondant à un réglage mini, et où une équerre appartenant au châssis et un disque de commande ont été omis.
• La figure 19 est une vue similaire à celle de la figure 18, où le dispositif de réglage est en configuration de réglage où le volet est dans une position de travail correspondant à un réglage maxi.
• La figure 20 est une vue simplifiée de face du système de réglage de la figure 17 où un volet est dans une position de dégagement / de tissage.
• La figure 21 est une vue de dos d'un actionneur électrique rotatif où un obturateur est en position nominale, c'est-à-dire une position de tissage.
• La figure 22 est une vue similaire à celle de la figure 21 où l'obturateur est dans une première position de bascule et le système de blocage est en configuration de libération.
• La figure 23 est une vue similaire à celle de la figure 21 où l'obturateur est dans une première position de bascule et le système de blocage est en configuration de blocage
• La figure 24 est une vue similaire à celle de la figure 21 où un obturateur est dans une seconde position de bascule et le système de blocage est en configuration de blocage.

The invention and other advantages thereof will appear more clearly in the light of the following description of embodiments in accordance with the invention, given solely by way of example and made with reference to the drawings below in which :

• There figure 1 is a partial perspective view of a loom equipped with a shedding assembly comprising four shedding machines, according to a first embodiment of the invention.
• There figure 2 is a perspective view, from another angle, of part of the loom of the figure 1 , where only one of the mob-forming machines is shown.
• There picture 3 is a partial longitudinal section of a connecting rod belonging to the shedding machine of the preceding figures.
• There figure 4 shows two perspective views of an eccentric system belonging to the shedding machine of the preceding figures, in different configurations.
• There figure 5 shows only part of the eccentric system of the figure 4 .
• There figure 6 is a front view of an adjuster, where a flap is in a release position.
• There figure 7 is a view similar to that of the figure 7 , where the flap is in a reference position.
• There figure 8 is a sectional view of the shedding machine of the figures 2 to 7 , showing in particular a blocking system.
• There figure 9 is a rear perspective view of the actuator of the figure 8 .
• There figure 10 shows two partial front views 10A and 10B of the same elements as on the figure 2 , in amplitude setting configuration.
• There figure 11 shows two partial front views 11A and 11B of the same elements as on the picture 2 , in height adjustment configuration.
• There figure 12 is a block diagram of an adjustment method according to the invention.
• There figure 13 is a perspective view of an eccentric system belonging to a loom according to a second embodiment of the invention.
• There figure 14 is a sectional view of the eccentric system of the figure 13 , with the eccentric system at a different setting.
• There figure 15 is a sectional view of one of the shedding machines belonging to the loom of figure 13 And 14 , showing in particular a blocking system.
• There figure 16 is a perspective view of an eccentric system belonging to a loom according to a third embodiment of the invention.
• There figure 17 is a perspective view of an adjuster according to another embodiment of the invention where a lower quarter of an adjuster control disc has been omitted.
• There figure 18 is a partial view of the device for adjusting the figure 17 in an adjustment configuration where a shutter is in a working position corresponding to a minimum adjustment, and where a bracket belonging to the frame and a control disc have been omitted.
• There figure 19 is a view similar to that of the figure 18 , where the adjustment device is in the adjustment configuration where the flap is in a working position corresponding to a maximum adjustment.
• There figure 20 is a simplified front view of the adjustment system of the figure 17 where a flap is in a release/weave position.
• There figure 21 is a back view of a rotary electric actuator where a shutter is in the nominal position, i.e. a weaving position.
• There figure 22 is a view similar to that of the figure 21 where the shutter is in a first rocking position and the locking system is in the release configuration.
• There figure 23 is a view similar to that of the figure 21 where the shutter is in a first rocking position and the blocking system is in the blocking configuration
• There figure 24 is a view similar to that of the figure 21 where a shutter is in a second rocking position and the blocking system is in the blocking configuration.

There figure 1 shows a first embodiment, including a loom 1 with heddle frames 11, a frame 12 and shedding machines 2 for operating the heddle frames 11. figure 1 , the frames 11 are shown on a reduced scale vis-à-vis the machines 2.

Here, four heald frames 11 and four machines 2 are provided, each machine 2 respectively actuating one of the frames 11.

As a variant, a number of frames 11 other than four is provided. As a variant, a number of machines 2 different from four is provided. As a variant, provision can be made for the same machine 2 to operate several heald frames 11.

Each frame 11 advantageously comprises an upper crosspiece 13, a lower crosspiece 14, parallel to the crosspiece 13 and two uprights 15 and 16, parallel to each other and connecting the crosspieces 13 and 14. Preferably, the crosspieces 13 and 14 are horizontal whereas uprights 15 and 16 are vertical. Each heald frame 11 is equipped with a row of healds, not shown, each connecting the crosspieces 13 and 14 and being arranged between the uprights 15 and 16, being distributed along the crosspieces 13 and 14. The healds each carry a eyelet through which a warp thread passes, the warp threads forming a layer of warp threads. The loom 1 advantageously includes other components, such as a flap, means for inserting a weft yarn, which are not shown.

For the purpose of performing weaving, each machine 2 is designed to actuate the corresponding heddle frame 11 according to an alternating translation stroke C11, relative to the frame 12, along a frame axis Z11 specific to this frame 11. ”, reference is made to the trajectory traveled by the frame 11 during its displacement. There figure 1 shows the stroke C11 for frame 11 located in the foreground of the figure 1 . Being moved by the machine 2 along the stroke C11, the frame 11 is moved parallel to the axis Z11, according to a rectilinear movement, going back and forth between a high extreme position H11, corresponding to an upper limit of the race C11, and a bottom extreme position B11, corresponding to a lower limit of race C11. The Z11 axis, and therefore the movement of the frame 11, is preferably vertical, or at least parallel to the smooth frame 11 considered. On the figure 1 And 2 , the frame 11 is shown in the upper extreme position H11.

During weaving, for the insertion of each weft thread, the position of the frames 11 along their respective stroke C11 is determined under the action of the machines 2, independently for each frame 11, to define the shedding of the loom loom receiving the inserted weft yarn. The loom 1 then produces a fabric of warp threads and weft threads with a desired weave.

Each shedding machine 2 comprises a rotary electric actuator 20, and a pulling mechanism comprising an eccentric system 30, a connecting rod 40, called the "transmission connecting rod", a lever 50, a connecting rod 60, a lever 70, a connecting rod 17 and connecting rod 18.

For each machine 2, the frame 11 is actuated by said machine 2 by being actuated by the electric actuator 20 of this machine 2, via the pulling mechanism of this machine 2, connecting the actuator 20 to the frame 11.

The actuators 20 are advantageously identical, arranged side by side in the same orientation. As shown on the figure 1 , the actuators 20 are advantageously arranged next to the frames 11, on the side of the lever 50. Each rotary electric actuator 20 is an electric motor.

One of the actuators 20 is shown in longitudinal section on the figure 8 . The actuator 20 comprises a stator 26, fixed relative to the frame 12, and a rotor 27 driving an output shaft 28 of the actuator 20.

In the present example, the stator 26 includes a carcass, which comprises a cylindrical wall with a circular base centered on an axis X20, called "main axis", and a fixing plate 73 perpendicular to the axis X20, closing a front end of the cylindrical wall and serving to fixly attach the stator 26 to the frame 12. The rotor 27 is supported by the stator 26, so as to be pivotable about the axis X20 with respect to the stator 26. The rotor 27 is coaxial with the X20 axis and is contained in the stator 26. The output shaft 28 is here directly formed at a front end of the rotor 27 and passes through the mounting plate 73 to emerge outside. When the actuator 20 is supplied electrically in an appropriate manner by a power circuit 21 belonging to trade 1, the output shaft 28 is driven in rotation in a driving manner around the axis X20 by the rotor 27. In other words , to electrically supply the rotor 27 and/or the stator 26 and control the actuator 20, the actuator 20 is electrically connected to the power circuit 21, as illustrated in the picture 2 .

Alternatively, provision may be made for the rotor and the output shaft to be separate and non-coaxial elements of the actuator 20, the rotor driving the output shaft via a reduction gear, the main axis X20 around which the output shaft rotates being parallel to the axis of rotation of the rotor.

For each actuator 20, axis X20 is perpendicular to axis Z11. For each actuator 20, the main axis X20 is advantageously perpendicular to a plane defined by the frame of healds 11. The frames 11, and the corresponding pulling mechanisms, are distributed parallel to the axis X20 of the actuators 20. Each mechanism of draw is advantageously coplanar with the frame 11 that it actuates. The actuators 20 are themselves slightly offset from each other parallel to the axis X20, so that their output shaft 28 is located in the plane of the frame 11 and of the pulling mechanism that it activates. The frames 11 and the pulling mechanisms being distributed along parallel planes, they do not impede each other in their movements.

Regarding the actuators 20, other configurations are possible. For example, the actuators 20 can be distributed in a vertical row, distributed on both sides of the frames 11, and/or mounted head to tail, for the needs of accessibility or the size of trade 1.

Preferably, during weaving, the actuator 20 performs a continuous rotation, that is to say a rotation without change of direction, and not an oscillating rotation.

As shown on the figure 1 , for each pulling mechanism, the lever 50 is pivotable with respect to the frame 12, around an axis X50, called “lever axis”, parallel to the main axis X20. Lever 50 is advantageously coplanar with frame 11 to be actuated. The lever 50 is linked to the frame 11 to be actuated, via the connecting rod 17. For this, the connecting rod 17 is coupled to a radial arm 51, here approximately horizontal, belonging to the lever 50, by an articulation end allowing a pivoting of the connecting rod 17 relative to the lever 50 around an axis parallel to the axis X50, and is coupled to the frame 11, by an articulation end allowing a pivoting of the connecting rod 17 relative to the frame 11 around an axis parallel to axis X50. The end of articulation of the connecting rod 17 with the frame is arranged on the side of the upright 15, at the bottom of the frame 11, here at the intersection between the upright 15 and the crosspiece 14. The two joints of the connecting rod 17 are approximately parallel to axis Z11. Via the connecting rod 17, the oscillating pivoting of the lever 50 actuates and determines the alternating translation of the frame 11 along the stroke C11.

At any time, the orientation of the lever 50 with respect to the frame 12 corresponds to a single position of the frame 11 along the race C11. During its pivoting in oscillation, the lever 50 pivots in a first direction up to a maximum orientation, where the frame 11 is in the high extreme position H11, then in a second opposite direction, up to a minimum orientation, where the frame 11 is in the lowest extreme position B11. Passing from the maximum orientation to the minimum orientation and vice versa, the lever 50 causes the frame 11 to cover the entire stroke C11.

Similarly, the lever 70 is pivotable relative to the frame 12, about an axis X70, called "lever axis", parallel to the main axis X20. Lever 70 is advantageously coplanar with frame 11 to be actuated. The lever 70 is linked to the frame 11 to be actuated, via the connecting rod 18. For this, the connecting rod 18 is coupled to a radial arm 71, here approximately horizontal, belonging to the lever 70, by an articulation end allowing a pivoting of the connecting rod 18 with respect to the lever 70 around an axis parallel to the axis X70, and is coupled to the frame 11, by an articulation end allowing a pivoting of the connecting rod 18 with respect to the frame 11 around an axis parallel to the axis X70. The end of articulation of the connecting rod 17 with the frame 11 is arranged on the side of the upright 16, at the bottom of the frame 11, here at the intersection between the upright 16 and the crosspiece 14. The two joints of the connecting rod 18 are approximately parallel to the Z11 axis. The connecting rods 17 and 18 are advantageously parallel. Via the connecting rod 18, the oscillating pivoting of the lever 70 actuates and determines the alternating translation of the frame 11 along the stroke C11.

The levers 50 and 70 are synchronized in their pivoting in oscillation, so as to be in the same orientation with respect to the frame 12, around their respective axis X50 and X70. In other words, the connecting rod 60 is coupled to the levers 50 and 70, to subject the pivoting in oscillation of the lever 70 to the pivoting in oscillation of the lever 50. For this, as shown in the figure 1 , the connecting rod 60 is coupled to a radial arm 52 of the lever 50, here a vertical arm, by an articulation end allowing a pivoting of the connecting rod 60 with respect to the lever 50 around an axis parallel to the axis X50, and to a radial arm 72, here a vertical arm, of the lever 70, by an articulation end allowing the connecting rod to pivot relative to the lever 70 around an axis parallel to the axis X70. Connecting rod 60 is approximately parallel to crosspieces 13 and 14 of frame 11. Connecting rod 60 is advantageously horizontal, or almost horizontal. The arms 51 and 52 are preferably perpendicular, so that the lever 50 has a general L shape. The arms 71 and 72 are preferably perpendicular, so that the lever 70 has a general L shape. oscillation around the axis X50 causes a synchronous actuation of the lever 70 in oscillation around the axis X70, via the connecting rod 60, which results in the actuation of the frame 11 in alternating translation by the two levers 50 and 70 at a time, via connecting rods 17 and 18.

At any time, the orientation of the lever 50 relative to the frame corresponds to a single position of the connecting rod 60 relative to the frame. At any time, the orientation of the lever 50 relative to the frame corresponds to a single position of the lever 70 relative to the frame.

The eccentric system is visible in particular on the figure 1 And 2 and is represented in particular on the figure 4 And 5 . The eccentric system 30 comprises a base 31 and a connecting piece 32.

Along the axis X20, the base 31 is preferably arranged between the actuator 20 and the connecting piece 32. The base 31 is directly formed by, or fixed on, the output shaft 28 of the actuator 20, so to be directly driven in rotation around the axis X20 by the actuator 20, with respect to the frame 12. The axis X20 is fixed with respect to the base 31. The orientation of the output shaft 28 around the axis X20 corresponds to that of the base 31. Via the base 31, the eccentric system 30 as a whole is driven in rotation by the actuator 20 around the axis X20. Conversely, the drive in rotation of the eccentric system 30 around the axis X20 drives the rotor in rotation around the axis X20.

The lever 50 is driven according to the pivoting in oscillation, that is to say, with change of direction, by the continuous rotation of the eccentric system 30, that is to say, without change of direction, by the intermediary of the connecting rod 40. The connecting rod 40 converts the continuous rotation of the eccentric system 30 into pivoting in oscillation of the lever 50. For this, the connecting rod 40 comprises, at a first end, an articulation end 41, and, at a second end , an articulation end 42.

As shown on the figure 1 And 2 , the connecting rod 40 is coupled to the connecting piece 32 of the eccentric system 30, via the hinge end 41. Via this hinge end 41, the connecting rod 40 and the connecting piece 32 are pivotable with respect to each other around an axis X41, called “eccentric axis”. The axis X41 is fixed relative to the connecting rod 40 and relative to the connecting piece 32 and is parallel to the axis X20. The axes X41 and X20 are separated from each other by a distance R1, which is a distance measuring the center distance between the axes X41 and X20. This distance R1 is called the “eccentric center distance”. When the eccentric system 30 rotates around the axis X20, the axis X41 rotates around the axis X20.

In the present example, the articulation end 41 comprises a circular flange centered on the axis X41 and which receives within it a crank pin 35 belonging to the connecting piece 32, the crank pin 35 being pivotally supported within the flange, via a bearing 43, here a bearing with rolling elements, centered on the axis X41. The crankpin 35 is shown without the circular flange of the connecting rod 40 on view 4B of the figure 4 and is omitted on view 4A of the figure 4 .

As shown on the figure 1 And 2 , via the hinge end 42, the connecting rod 40 is coupled to the arm 52 of the lever 50. Alternatively, the connecting rod 40 is attached to another arm of the lever 50, which is separate from the arms 51 and 52 In any event, via this hinge end 41, the connecting rod 40 and the lever 50 are pivotable relative to each other around an axis X42, called the "connecting rod axis". . The axis X42 is fixed with respect to the connecting rod 40 and with respect to the lever 50. The axes X42 and X50 are parallel and distant from each other, so that the arm 52 to which the articulation end 42 is connected serves as a lever arm for the actuation of the lever 50 by the connecting rod 40. When the connecting rod 40 is driven by the eccentric system 30, the axis X42 rotates around the axis X50. The X42 axis is also parallel and distant from the X20 axis. Axes X41 and X42 are parallel and distant from each other by a distance R2, which is a distance measuring the center distance between the axes X41 and X42. This distance R2 is referred to as the “connecting rod center distance”.

In the present example, the end of the articulation 42 comprises two parallel flanges arranged on either side of the lever 50. These two flanges of the end 42, as well as the arm 52 of the lever 50 being crossed by an orifice, coaxially with the axis X42, within which is received a rivet, not shown, to couple the lever 50 and the connecting rod 40 while allowing their relative pivoting.

The pulling mechanisms being distributed side by side along the X20 axis, in particular, the connecting rods 60 are distributed side by side along the X20 axis. In particular, each connecting rod 60 moves along a connecting rod plane P60 which is specific to it, perpendicular to the axis X20, next to the following connecting rod 60. The connecting rod plane P60 is advantageously coplanar with the plane of the frame 11, and with a similar connecting rod plane for the connecting rod 40 of the same machine 2.

Each shedding machine 2 includes an adjustment system, which allows for a locked configuration and one or more adjustment configurations. In locked configuration, the center distances R1 and R2 are fixed. To perform a weave, it is ensured that the adjustment system is in the locked configuration. In the locked configuration of the adjustment system and in weaving operation of the loom, the distance between centers R1 and R2 cannot be modified. For each adjustment configuration, one of the spacing distances R1 and R2 is variable so that it can be adjusted, while the other spacing distance R1 or R2 is fixed. Here, the adjustment system makes it possible to move alternately between the locked configuration, an amplitude adjustment configuration where the eccentric center distance R1 is variable while the connecting rod center distance R2 is fixed, and a height adjustment configuration where the distance R2 is variable while the distance R1 is fixed. As a variant, provision could be made for the adjustment system to move only between the locked configuration and only one of the adjustment configurations, for example the height adjustment configuration.

Due to the structure of the pulling mechanism, modifying the eccentric center distance R1 correspondingly modifies the amplitude of the stroke C11, that is to say the distance between the extreme position high H11 and the bottom extreme position B11 taken by the frame 11 when it is driven under the action of the actuator 20 while the adjustment system is in the locked configuration. In this case, the greater the distance R1, the greater the amplitude of the stroke C11, that is to say the greater the distance between the positions B11 and H11. Modifying the eccentric center distance R1 therefore makes it possible to modify the amplitude of the opening of the shed controlled by the frame 11. For example, it is provided that the distance R1 can be varied by a minimum value of 20 mm (millimeters) to a maximum value of 60 mm, to vary the amplitude of the stroke C11 from a minimum value of 50 mm to a maximum value of 160 mm, when the height of the stroke C11 is centered on a position of reference P11, that is to say with positions B11 and H11 equidistant from position P11. The reference position P11 is defined as being a central position, which may correspond to the crossing position of the loom 1 for all the layers of threads.

Due to the structure of the pulling mechanism, the fact of modifying the connecting rod center distance R2 modifies, in a corresponding manner, the height of the stroke C11 with respect to the frame 12, that is to say the height of the race C11 relative to the reference position P11 of the frame 11 relative to the frame 12 along the axis Z11, shown on the figure 1 . In particular, increasing the connecting rod center distance R2 shifts both the extreme position H11 and the extreme position B11 upwards relative to the position P11. Conversely, reducing the connecting rod center distance R2 shifts both the extreme position H11 and the extreme position B11 downward relative to the position P11. Preferably, modifying the distance R2 does not modify the amplitude of the stroke C11, that is to say does not modify the distance between the positions B11 and H11. Modifying the connecting rod center distance R2 therefore makes it possible to modify the crossing of the crowd by adjusting the opening height of the crowd controlled by the frame 11. For example, it is provided that the distance R2 can be varied by -6 mm to +6 mm with respect to a central value, corresponding to a height offset of the stroke C11 of -8 mm to +8 mm with respect to the reference position P11.

As illustrated on the figure 4 , 8 And 10 , so that the center distance of the eccentric R1 can be variable, the geometry of the eccentric system 30 is adjustable, and in particular the connecting piece 32 is made movable relative to the base 31. The adjustment system comprises means locking to selectively authorize this mobility, to obtain the amplitude adjustment configuration, and prohibit this mobility, to obtain the locked configuration or the height adjustment configuration.

The base 31 here forms a discoid plate perpendicular to the axis X20, formed at one end of the output shaft 28 and better visible on the figure 5 . For this embodiment, the connecting piece 32 comprises the pin 35, visible in particular for case 4B of the figure 4 , and a flange 36. In the example, the crank pin 35 is generally cylindrical in shape with a circular base, and is centered on the axis X41, to support the pivoting of the connecting rod 40 with respect to the connecting piece 32.

The flange 36 is secured to the crankpin 35, as can be seen in particular on the figure 4 And 8 . In this example, flange 36 forms a flat piece, perpendicular to axis X20 and crossed by axes X20 and X41. Along the axis X20, the flange 36 is arranged between the base 31 and the crankpin 35. The crankpin 35 projects with respect to the flange 36, in a direction opposite to the actuator 20. To assemble the crankpin 35 with the flange 36, it is advantageously provided that the crank pin 35 is fixed by screws, or similar fastening elements, on the flange 36.

In this example, in order to obtain that the distance R1 is variable when the adjustment system is in the amplitude adjustment configuration, the connecting piece 32 is supported by the base 31 while being movable in radial translation relative to the base. 31, along a translation axis R32. The connecting piece 32 is also prevented from pivoting with respect to the base 31, around the axis X20. Axis R32 is radial with respect to axis X20, ie it intersects axis X20 and is perpendicular to axis X20. The axis R32 is parallel to the distance R1. For any position of the connecting piece 32 with respect to the base 31, the axis R32 intersects the axis X20 and the axis X41. By displacement in translation of the connecting piece 32 with respect to the base 31 along the axis R32, the distance R1 is varied. Indeed, the axis X41 being fixed with respect to the connecting piece 32 and the axis X20 being fixed with respect to the base 31, the relative movement of these two parts varies the distance R1 which separates these axes X20 and X41 .

To obtain that the connecting piece 32 is mobile in radial translation relative to the base 31, while being able to be selectively fixed in radial translation relative to the base 31, provision is preferably made for the flange 36 to comprise an oblong orifice 77, although seen on the figure 4 and that the eccentric system 30 comprises a rod 78, visible on the figure 4 And 8 . The oblong orifice 77 crosses the flange 36 right through, parallel to the axis X20. The oblong orifice 77 is elongated along the translation axis R32 and extends along this axis R32. Rod 78 is coaxial with axis X20, and passes through oblong orifice 77 to support flange 36 via oblong orifice 77. Rod 78 supports and guides the radial translation of oblong orifice 77 along the R32 axis. The rod 78 also prevents the pivoting of the oblong orifice 77 around the axis X20, with respect to the base 31, by forming both flats 75, shown on the figure 5 , which cooperate with flats of the base 31, and also sliding surfaces 79, which cooperate with parallel edges 76 of the oblong orifice 77.

More specifically, as shown in the figure 4 , 5 And 8 , the rod 78 preferably comprises a clamping screw 93 and a clamping nut 94, thus constituting the locking means of the adjustment system for selectively fixing and authorizing the variation of the distance R1. The nut 94 is also used configured to guide the translation radial of the connecting piece 32 along the axis R32 and to prevent its rotation around the axis X20.

In detail, screw 93 and nut 94 are screwed together, coaxially with axis X20. The screw 93 crosses the base 31 right through along the X20 axis, and is pivotable with respect to the base 31 around the X20 axis to perform the screwing and unscrewing with the nut 94. As visible on the figure 5 , the nut 94 is immobilized in rotation relative to the base 31 around the axis X20, while being allowed to translate relative to the base 31 along the axis X20. For this, provision is made for a rear end 74 of nut 94 to be received in a central orifice of base 31, centered on axis X20. The rear end 74 and this central orifice have complementary anti-rotation shapes. For example, as shown in figure 5 , the rear end 74 comprises the flats 75, which are diametrically opposed, cooperating with complementary flats belonging to the central orifice of the base 31, to prevent the rotation of the nut 94 around the axis X20 with respect to the base 31, while guiding the translation of the nut 94 along the axis X20 with respect to the base 31.

These arrangements mean that, when the screw 93 is pivoted around the axis X20 with respect to the base 31, the nut 94 translates along the axis X20 with respect to the base 31, without rotation around the axis X20.

Furthermore, the nut 94 is received in the oblong orifice 77, so as to serve as a bearing for the radial translation of the flange 36, when the adjustment system is in the amplitude adjustment configuration. Preferably, by screwing the screw 93 with the nut 94, the nut 94 bears axially against a peripheral edge of the oblong orifice 77, in the direction of the actuator 20, and a head of the screw 93 bears against the rotor 27, in the opposite direction, to immobilize the connecting piece 32 with respect to the base 31 and to the rotor 27, by tightening the flange 36 along the axis X20. In other words, the flange 36 is axially clamped against the base 31 by the clamping nut 94, to secure the connecting piece 32 with the base 31 when the adjustment system is in the locked configuration.

As shown on the figure 5 , at its front end, the nut 94 forms the sliding surfaces 79, which are here in the form of two diametrically opposed flats. The sliding surfaces 79 cooperate with two complementary rectilinear edges belonging to the oblong orifice 77. Thanks to these surfaces 79, the connecting piece 32 is guided in translation along the axis R32 with respect to the nut 94, while being fixed in rotation around the axis X20 with respect to the nut 94. The nut 94 being itself fixed in rotation with respect to the base 31, it follows that the connecting piece 32 is fixed in rotation by relative to the base 31 around the axis X20, via the nut 94.

In summary, to obtain the amplitude adjustment configuration, the screw 93 and the nut 94 are loosened, which allows the translation of the connecting piece 32 with respect to the base 31. To obtain the locked configuration, the screw 93 and the nut 94, which secures the connecting piece 32 with the base 31.

As seen on the figure 8 And 9 , it is advantageously provided that the screw 93 extends through the actuator 20, so that a head of the screw 93 emerges at one end of the actuator 20, which is opposite to that carrying the flange 36. head of the screw 93 is therefore very easily accessible for a person, having to switch the adjustment system between the adjustment configuration and the locked configuration, by screwing or unscrewing the screw 93 via its head.

There figure 4 shows a case 4A corresponding to a maximum amplitude adjustment configuration, where the part 32 is positioned so that the distance R1 takes a maximum eccentric center distance value, and a case 4B corresponding to an adjustment configuration of minimum amplitude, where part 32 is positioned so that distance R1 assumes a minimum center distance value. There figure 10 shows a case 10A corresponding to a maximum amplitude adjustment configuration, where the part 32 is positioned so that the distance R1 takes on a maximum eccentric center distance value, and a case 10B corresponding to an adjustment configuration of minimum amplitude, where part 32 is positioned so that distance R1 assumes a minimum center distance value.

Preferably, the adjustment system comprises amplitude adjustment stops, to limit the movement, that is to say here the translation along the axis R32, of the connecting piece 32 with respect to the base 31, along axis X32, between the position shown in cases 4B and 10B where the distance R1 takes the minimum eccentric center distance value and the position shown in cases 4A and 10A, where the distance R1 takes the maximum center distance value eccentric. Preferably, the movement of the part 32 therefore takes place only between these two predetermined positions, without going beyond. Preferably, in practice, the adjustment of the amplitude of the stroke C1 is carried out for values of the distance R1, which are lower than the maximum value and higher than the minimum value, whereas the distance R1 is only brought to the maximum and minimum values only for control steps, for example tightening control. Thus, in the locked configuration, the value of the distance R1 is always at a value which is lower than the maximum value and higher than the minimum value, and the amplitude adjustment stops are not stressed.

In the present example, to constitute the amplitude adjustment stops, the rod 78, in particular the nut 94, comes into abutment against the ends of the oblong orifice 77. This is particularly visible on the figure 4 , where in the case 4A, the nut 94 abuts against a first end of the oblong orifice 77 along the axis R32, and where in the case 4B, the nut 94 comes into abutment against the second end of the oblong orifice 77, in the opposite direction, along the axis R32 .

As illustrated on the figure 1 , 2 , 3 And 11 , so that the connecting rod center distance R2 can be variable, the hinge ends 41 and 42 of the connecting rod are movable relative to each other. The adjustment system comprises locking means for selectively authorizing this mobility, to obtain the height adjustment configuration, and prohibiting this mobility, to obtain the locked configuration or the amplitude adjustment configuration.

In the present example, so that the connecting rod center distance R2 is adjustable when the adjustment system is in height adjustment configuration, the ends 41 and 42 slide relative to each other, along an axis of sliding R40 intersecting the axes X41 and X42, or at least parallel to the connecting rod 40. For example, the connecting rod 40 comprises a connecting rod end 44, carrying the end 41, and a connecting rod end 45, carrying the end 42 Preferably, the endpiece 44 is fitted slidingly into the endpiece 45. For this, the endpiece 45 is for example in the form of a sheath to receive the endpiece 44, which is in the form of a a rod integral with the circular flange, and guide its sliding along the axis R40.

To form the locking means of the adjustment system, it is provided for example that the connecting rod 40 comprises a stirrup 96, a pad 97 and at least one tightening screw 98, here three. The head of the screws 98 is accessible from outside the connecting rod 40. The stirrup 96 and the pad 97 are arranged inside the sheath of the end piece 45 and together constitute a clamp for locking the stem of the end piece 44. The yoke 96 and the pad 97 are arranged like a pincer on either side of the end piece 44. The pad 97 is fixed with respect to the end piece 45 and is interposed between a wall of the sheath and the stem of the tip 44. The stirrup 96 is arranged between the other wall of the sheath and the stem of the tip 44, being movable in translation in a direction perpendicular to the axis R40, between a tight position, where the stem of the end piece 44 is clamped between the yoke 96 and the shoe 97, so that the end piece 44 is immobilized along the axis R40 with respect to the end piece 45, and a loose position, where the stem of the tip 44 is sufficiently loosened to be able to slide. Screwing in clamping screws 98 moves yoke 96 to the clamped position. Unscrewing the clamping screws 98 allows the caliper to return to its loosened position.

There figure 11 shows a case 11A corresponding to a minimum height configuration, where the ends 41 and 42 are arranged so that the distance R2 takes on a minimum connecting rod center distance value, that is to say corresponding to the case where the race C11 East shifted to its lowest height relative to the reference position P11. There figure 11 shows a case 11B corresponding to a maximum height configuration, where the ends 41 and 42 are arranged so that the distance R2 takes on a maximum connecting rod center distance value, that is to say corresponding to the case where the stroke C11 is shifted towards its highest height relative to the reference position P11.

Preferably, the adjustment system comprises height adjustment stops, to limit the movement, that is to say here the sliding, of the ends 41 and 42 along the axis R40, between the position shown at 11A where the distance R2 takes the minimum connecting rod center distance value and the position shown in 11B where distance R2 takes the maximum connecting rod center distance value. The relative movement of the ends 41 and 42 therefore takes place only between these two positions, without going beyond. For example, to constitute the height adjustment stops, the sheath of the end piece 45 comprises an abutment 46, formed by a parallelepipedic block fixed by screws on the inside of the sheath, and the stem of the end piece 44 comprises a groove , forming two facing shoulders 47, framing the stop 46. Preferably, in practice, the adjustment of the height of the stroke C1 is carried out for values of the distance R2, which are lower than the maximum value and higher than the value minimum, whereas the distance R2 is brought to the maximum and minimum values only for control steps, for example the tightening control. Thus, in the locked configuration, the value of the distance R2 is always at a value which is lower than the maximum value and higher than the minimum value, and the height adjustment stops are not stressed.

As shown on the figure 11 for cases 11A and 11B, the abutment 46 alternately comes into abutment against one and the other of the shoulders 47, so that the sliding travel of the ends 41 and 42 is limited. The stop 46 moves freely between the shoulders 47 to obtain the intermediate values of the distance R2.

Preferably, the adjustment system comprises a set of amplitude adjustment graduations, indicating an amplitude adjustment value depending on the center distance of the eccentric R1. In this case, the set of graduations is for example marked on the base 31 while a marker is marked on the connecting piece 32, or vice versa. Preferably, the adjustment system comprises a set of height adjustment graduations, indicating an amplitude adjustment value depending on the connecting rod center distance R2. In this case, the set of graduations is for example marked on the stem of the end piece 44 while the edge of the sheath of the end piece 45 serves as a mark.

In the locked configuration of the adjustment system, used in particular during weaving carried out by the loom 1, the rotation of the eccentric system 30 around the axis X20 with respect to the frame 12 by the actuator 20, causes the displacement of the frame 11, via the pulling mechanism. While the rotation of the eccentric system 30 is carried out without changing direction, the levers 50 and 70 pivot in oscillation and the frame 11 is in alternating translation. At each complete turn of the eccentric system 30 around the axis X20 with respect to the frame 12, the levers 50 and 70 have pivoted in one direction then in the other and have returned to their initial position, and the frame 11 has traveled the C11 course in both directions and returned to its original position. In detail, when the eccentric system 30 performs a first half-turn, the frame 11 is driven from the bottom extreme position B11 to the top extreme position H11. When the eccentric system 30 continues its rotation without changing direction, the frame 11 is driven in the opposite direction from the upper extreme position H11 to the lower extreme position B11.

As seen on the figure 8 And 9 , the shedding machine 2 includes a blocking system 80. In the present example, an individual blocking system 80 is provided for each shedding machine 2. The blocking system 80 allows a blocking configuration shown on the figure 8 And 9 and a release configuration.

In the blocking configuration, the blocking system 80 immobilizes the base 31 around the axis X20 at a reference orientation. In other words, the base 31 is immobilized around the axis X20 with respect to the stator 26. The reference orientation is preferably that shown on the figure 1 , 2 , 10 And 11 and is adopted for the setting configuration. It is provided that, when the base is in the reference orientation, the axis R32 is parallel to the axis X40. In other words, in the reference orientation, the axes X41, X42 and X20 are coplanar. Preferably, in the reference orientation, the axes X42, X41 and X20 are arranged in this order, that is to say with the axis X41 between the axes X20 and X42, as shown in the figure 1 And 2 . Alternatively, it is provided that, in reference orientation, the axes X42, X20 and X41 are arranged in this order, that is to say with the axis X20 between the axes X42 and X41. Preferably, the reference orientation is chosen to correspond to the case where the frame 11 is positioned in the extreme position, preferably in the high extreme position H11, to correspond to a situation where the frame 11 tends to move the connecting rod 60 in the opposite direction. of a direction d101, defined below, under the effect of gravity.

Another noteworthy orientation is also defined for the base 31, called the “release orientation”, in which the axes X41, X20 and X42 are also coplanar, but being arranged in an inverse order with respect to their arrangement when the base 31 is in the reference orientation. In the example case where the reference orientation of the base 31 has the axes X42, X41 and X20 in this order, the clearance orientation has the axes X42, X20 and X41 in this order, that is to say that we invert axes X20 and X41. Preferably, the release orientation corresponds to a half-turn of the base 31 with respect to the reference orientation. Preferably, when the base 31 is in the release orientation, the frame 11 is in the bottom extreme position B11.

Alternatively, if it is provided that the reference orientation aligns the axes X41, X20 and X42 in this order, the clearance orientation aligns the axes X20, X41 and X42 in this order.

As a variant, provision could be made for the reference orientation to correspond to placing the frame in position B11, while the disengagement orientation corresponds to placing the frame in position H11.

In the release configuration, the locking system 80 does not oppose the pivoting of the base 31, in particular under the action of the actuator 20.

As illustrated on the figure 8 And 9 , the locking system 80 comprises a pin 81, an indexing housing 82 and a flange 83. On the figure 8 And 9 , the blocking system 80 is shown in the blocking configuration. On the figure 9 , index housing 82 is omitted to show flange 83.

The indexing box 82 is integral with the stator 26. The indexing box 82 is arranged at the rear of the actuator 20, in particular at the rear of the stator 26, that is to say at the opposite of the eccentric system 30 along the axis X20. The flange 83 is integral with the rotor 27. The flange 83 is arranged at the rear of the actuator 20, in particular at the rear of the rotor 27, that is to say opposite the eccentric system according to the axis X20. The flange 83 being integral with the rotor 27, it is integral in rotation with the output shaft 28 and the base 31 around the axis X20. Flange 83 is advantageously placed between indexing box 82 and base 31, along axis X20. Indexing housing 82 and flange 83 are both centered on axis X20. If the screw 93 is provided, it is provided that the indexing housing 83 and the flange 83 each include a central opening to allow the technician to access the head of the screw from the rear end of the actuator 20, at the through the casing 82 and the flange 83. In the present example, the casing 82 constitutes a rear wall of the stator 26, and carries a bearing with a rolling element to support the rotation of the rotor 27 around the axis X20. The flange 83 constitutes for its part a rear part of the rotor 27, received within the bearing carried by the housing 82.

The housing 82 advantageously comprises an orifice 84, which passes through the housing 82 along an axis parallel to the axis X20 and not coaxial with the axis X20. In other words, the orifice 84 is offset from the axis X20. Pin 81 passes through orifice 84, so as to be supported by housing 82, sliding through orifice 84, parallel to axis X20, relative to housing 82.

The flange 83 includes a notch 85, which is arranged radially with respect to the axis X20. When base 31 is in the reference orientation shown in the figure 8 And 9 , the notch 85 is aligned with the orifice 84, so that the orifice 84 and the notch 85 are crossed by an axis, which is parallel to the axis X20. In this orientation, the pin 81 can be slid to a locking position, shown on the figure 8 And 9 , where a front end of the pin 81 is received in the notch 85. Then, the pin 81 prevents the rotation of the flange 83, and therefore of the base 31, around the axis X20. In other words, the blocking system 80 is in the blocking configuration. Pin 81 can be slid to a release position, or even removed from actuator 20, by being slid away from base 31, i.e. towards the rear of the actuator 20. In the absence of the pin 81, or when the pin 81 is in the release position, the front end of the pin 81 is disengaged from the notch 85, so that the pin 81 does not oppose the rotation of the flange 83 and of the base around the axis X20. The locking system 80 is then in the release configuration.

The actuator 20 advantageously comprises a cover 86, shown in the figure 8 , which covers the housing 82 and the flange 83 and, more generally, closes the rear of the actuator 20. Preferably, as shown in the figure 8 , the cover 86 comprises an orifice which the pin 81 passes through when the pin is in the locking position, so that the pin 81 is accessible to the technician from outside the actuator 20 and can be actuated without having to open the cover 86.

As a variant, it is possible to provide that the housing 82 comprises several orifices 84, arranged at different indexing positions around the axis X20, so that the pin 81 can be inserted, as desired, within one of these orifices. 84. The cover 86, if provided, then comprises corresponding orifices to be traversed by the pin 81. Depending on the orifice 84 receiving the pin 81 in the blocking position, a blocking of the base 31 is obtained according to several different orientations, including the aforementioned reference orientation.

It is expected that the locking system 80 is in the release configuration for weaving. Provision is made for the blocking system 80 to be in the blocking configuration when the adjustment system is in the adjustment configuration.

In variant represented figure 21 , 22 , 23 And 24 , one can provide a locking system 180, instead of the locking system 80 mentioned above. The blocking system 180 is an indexing finger system, comprising a finger 181, which performs the same function of the pin 81 mentioned above. The locking system 180 also comprises the same indexing housing 82 and the same flange 83 as described above.

Finger 181 passes through orifice 84 of casing 82, so as to be supported by casing 82, by sliding through orifice 84, parallel to axis X20, relative to casing 82. Finger 181 also passes through the cover 86, to be able to be actuated by the technician from outside the actuator 20 without opening the cover 86. The orifice 84 of the housing 82 guides a sliding of the finger 181, here parallel to the axis X20, between a release position, shown on the figure 21 And 22 , and a blocking position, shown on the figure 23 And 24 , analogously to the pin 81 mentioned above.

When the base 31 is in the reference orientation, the notch 85 is aligned with the finger 181. The finger 181 can then be slid to the locking position, where a front end of the finger 181 is received in the notch 85. Finger 181 thus prevents rotation of flange 83 and therefore of base 31, around axis X20. In other words, the blocking system 180 is in the blocking configuration. The finger 181 can also be slid to the release position, preferably without being able to be removed from the actuator 20, by being slid away from the base 31, that is to say backwards. of the actuator 20. In the release position, the front end of the finger 181 is disengaged from the notch 85, so that the finger 181 does not oppose the rotation of the flange 83 and of the base around the X20 axis. The locking system 80 is then in the release configuration.

It is advantageously provided that the blocking system 180 comprises a shutter 187, carried at the rear of the actuator 20, for example on a wiring box 188 carried by the wall 86. The wiring box 188 is fixed to the wall 86 for example by means of four screws.

The shutter 187 is pivotable with respect to the stator 26, to the casing 82 and to the wall 86, around an axis X189 parallel to the axis X20, between a nominal position, shown on the figure 21 , a first rocking position, shown on the figure 22 And 23 , and a second rocking position, shown on the figure 24 .

The shutter 187 comprises a first lobe 189 and a second lobe 190 symmetrically opposite with respect to the axis X189. The lobe 189 extends along a first plane perpendicular to the axis X189 and the lobe 190 extends along a second plane perpendicular to the axis X189, the second plane being offset rearward relative to the first. In other words, along the axis X189, the lobe 190 is farther from the wall 86 than is the lobe 189. The lobes 189 and 190 define between them two radial notches. The size of these radial indentations allows access to a tool such as a screwdriver, or to the finger. of the technician, in the radial notch. Advantageously, the shutter 187 comprises an extreme fold 191, carried here by the lobe 189, which facilitates the gripping and the rotation of the shutter 187 by the technician.

Being closer to wall 86, lobe 189 interferes with finger 181 when finger 181 is in the release position. In particular, while the shutter is in the nominal position or in the first rocking position, the finger 181 in the release position prevents the shutter 187 from being pivoted to the second rocking position, because the lobe 189 abuts radially against finger 181, then projecting beyond lobe 190 along axis X189. Furthermore, when the shutter 187 is in the second rocking position shown on the figure 24 , it covers the finger 181, then in the blocking position, thus preventing the actuation of the finger 181 by the technician and/or opposing a setting in the release position of the finger 181.

Being farther from the wall, the lobe 190 does not interfere with the finger 181, whether the finger is in the release position or in the locking position. However, in the nominal position, as shown in the figure 21 , lobe 190 covers finger 181, whether the finger is in the locked or released position, to prevent actuation of finger 181 by the technician. In the other positions of the shutter 187, such as those shown in figures 22 to 24 , the lobe 190 is offset from the finger 181.

The finger 181 can only be actuated by the technician when it is axially aligned with one of the radial notches of the shutter 187, so as not to be covered by one of the lobes 189 and 190, in particular in first rocking position as shown on the figure 22 And 23 .

In a variant not shown, provision is made for the locking system to be a pin system formed by a pin movable in translation in a sheath integral with the cover 6 and grooved in L in which a peripheral lug of the pin makes it possible to confirm an axial position driving the pin in the locking configuration.

In a variant not shown, provision is made for the blocking system to be a pneumatic or electric indexing finger system that can be activated, for example remotely controllable.

The loom also includes an adjustment device 100, visible in particular on the figure 1 , 2 , 6 , 7 , 10 And 11 . The adjustment device 100 has the function of performing the adjustment of the shedding machine 2, in the case where the machine 2 is in the height adjustment configuration and in the case where the machine 2 is in the adjustment configuration amplitude, and while the blocking system 80 is in the blocking configuration. For this, the adjustment device 100 is capable of actuating the respective connecting rods 60 of the 2 machines in setting configuration. To be able to be actuated by the adjustment device 100, each connecting rod 60 is equipped with a follower member 120 respectively.

A single adjustment device 100 is advantageously provided, which is shared between the machines 2. However, several adjustment devices 100 could be provided, each devoted to the adjustment of one or more machines 2.

The adjustment device 100 mainly comprises a shutter 101, to move the connecting rods 60 via their respective follower member 120, as well as a shutter actuator 102, to actuate the shutter 101. The device 100 advantageously comprises a frame 104 The adjustment device 100 is placed close to the connecting rods 60, for example above the connecting rods 60, as shown in the figures. figure 1 And 2 .

The frame 104 is a fixed part with respect to the frame 12, being secured to the structure of the loom. The frame 104 supports the shutter 101 and the actuator 102. The frame 104 here comprises two brackets, each formed by a folded sheet. Each of these brackets is linked to a respective fixed crosspiece, belonging to the loom, not shown. The brackets are arranged on either side of the set of connecting rods 40, parallel to the axis X20.

The flap 101 is supported by the frame 104, being pivotable with respect to the frame 104 around an axis X101, called the “steering axis”. The axis X101 is advantageously parallel to the axes X20, that is to say perpendicular to the planes of the frames 11 and to the connecting rod planes P60. In practice, the flap 101 extends from one of these brackets to the other of these brackets, being pivotally supported around the axis X101 by the brackets, at its axial ends. To this end, each bracket carries a respective bearing centered on the axis X101 to support one of the ends of the flap 101. By pivoting, the flap 101 is configured to move one or more connecting rods 60 by driving the follower member 120 fitted to the connecting rod(s) 60 concerned. Thus, the shutter 101 can adjust the distance R1, in the case where the adjustment system is in amplitude adjustment configuration, and the distance R2, in the case where the adjustment system is in height adjustment configuration.

The flap 101 is advantageously in the form of a rectangular plate of constant thickness. The flap 101 has a proximal edge 106 and a distal edge 107 parallel to the axis X101 and opposite. The distal edge 107 is located on the side of the connecting rods 60, with respect to the X101 steering axis, and the proximal edge 106 is located opposite with respect to the X101 axis.

Preferably, parallel to the axis X101, and therefore to the axis X50, the flap 101 extends from the first of the connecting rods 60, to the last of the connecting rods 60 of the set of rods 60. In other words, along the axis X101, an axial end of the flap 101 is at the height of the first of the rods 60, and another axial end of the flap 101 is at the height of the last of the rods 60, so that all the connecting rods 60 can be actuated by the flap 101. In other words, the flap 101 crosses all the connecting rod planes P60 of the shed formation assembly. Along the axis X101, the brackets of the frame 104 are therefore positioned on either side of the connecting rods 60 so that the flap spans all the connecting rods 60. The same flap 101 can therefore reach and drive all the follower members 120.

Preferably, all the follower members 120 are positioned at the same place on their respective connecting rod 60 so that they can be actuated indifferently by the flap 101. This also makes it possible to actuate several connecting rods 60 at the same time in the same way, with the same shutter 101, if necessary. By actuating several follower members 120 at the same time, the levers 50 and 70 and the corresponding frames 11 are moved simultaneously to the same positions. This also makes it possible to obtain that all the follower members are aligned along the same axis parallel to the axis X101 when the machines 2 are placed in a leveling configuration. Also, this makes it possible to retain all the follower members, for example in an emergency situation in the trade, to prevent the frames from falling by gravity.

Each follower member 120 is advantageously in the form of a follower finger, as clearly visible on the figure 6 And 7 . The follower finger is for example cut from a piece of sheet metal, the thickness of which is close to or less than that of the connecting rod 60 or of the frame 11, the thickness being measured parallel to the axis X101. The member 120 extends along the connecting rod plane P60 of the connecting rod 60 that it equips. The follower member 120 is integral with the connecting rod 60, by being screwed therein for example. The follower member 120 protrudes from the connecting rod 60 perpendicular to the axis X101, in the direction of the frame 11, that is to say in the direction of the device 100. In particular, the follower member 120 is carried on an edge of the connecting rod 60, here the upper edge. As a variant, the follower member can extend perpendicular to the connecting rod 60. As a variant, the follower member can be defined by another profile.

By pivoting around the axis X101, the flap 101 is movable between a release position, shown on the figure 6 , and working positions, one of which is shown on the figure 7 .

As shown on the figure 7 , in the working position, the flap 101 bears against at least one of the follower members 120, to drive this member 120. The flap 101 is moved to one of the working positions while the machine 2 is in configuration of adjustment and that the blocking system 80 is in the blocking configuration, so that the shutter 101 adjusts the distance R1 or R2 of the machine 2 by driving the member 120. then gives the flap a working position corresponding to the adjustment of the desired distance R1 or R2, according to a method detailed below. In this working position, the flap 101 bears against the member 120 in the direction of a direction d101, called the “retaining direction”. In other words, the flap 101 bears against the member 120 in the retaining direction d101. The direction d101 is parallel to the connecting rod 60, or close to being parallel to the connecting rod 60. The orientation of the retaining direction d101 depends on the contact maintained by the flap 101 on the profile of the member 120 in the working position . In the present example, the direction d101 is oriented in a direction which goes from the lever 50 to the lever 70. The direction d101 is parallel to the plane P60. It is advantageously provided that the flap 101 bears only in this direction, and not, for example, in the opposite direction. Consequently, the design of the adjusting device 100 can remain relatively simple.

In practice, the flap 101 retains the connecting rod 60 via the member 120, against forces applied by the frame 11, under the effect of gravity, on the levers 50 and 70, and tending to move the connecting rod 60 in the opposite direction of the direction d101. In practice, frame 11 tends to move downwards, along axis Z11, under the effect of gravity and possibly other forces acting within the loom, such as, for example, weight and/or or the tension of the warp threads. In the present example, given the arrangement of the links linking the frame to the levers 50 and 70, this descent of the frame 11 causes a rotation of the levers 50 and 70, via the connecting rods 17 and 18, in a direction which tends to move the connecting rod 60 opposite to direction d101. Thanks to this, it is certain that the flap 101 is kept in contact with the member 120, so that the flap 101 can actuate the connecting rod in the direction of the direction d101 and in the opposite direction. Advantageously, in position H11, the tension of the warp threads tends to maintain the contact of the shutter on the follower member because the warp threads then act on the frame 11 in the same direction as the effect of gravity. On the contrary, in an adjustment configuration of the frame 11 from its position B11, the tension of the warp threads tends to move the frame in the opposite direction to gravity, which would tend to cause the contact between the follower member and the shutter. Preferably, the chain tension is set to be reduced during shedding operations to ensure that contact between the follower and the shutter is maintained under the effect of gravity when the shutter is close to position B11 , without however being excessive when the frame is close to position H11.

As shown on the figure 6 , in the released position, the flap 101 is oriented in a disengaged manner vis-à-vis all the members 120, that is to say in a position where the members 120 do not come into contact with the flap 101, whatever the position of the corresponding connecting rods 60. The release position is adopted in particular by locked configuration and in particular during weaving, so that the flap 101 cannot come into contact with the members 120 and hinder the movement of the machines 2. The release position is reached by moving the flap 101 in the direction opposite to the direction of restraint d101. In other words, in the release position, the edge 107 is arranged in the opposite direction to the retaining direction d101 with respect to the position adopted by the edge 107 when the flap 101 is in the working position. The flap 101 does not hinder the movement of the frame between its positions H11 and B11.

In the present example, the follower member 120 comprises an end part defining a guide profile 121 and a foot 122 defining a clearance profile 123. The profiles 121 and 123 are turned in the opposite direction to the direction d101. The follower member 120 is integral with the connecting rod 60 via the foot 122.

The guide profile 121 is convex in the connecting rod plane P60. As shown on the figure 7 , to drive the connecting rod 60 via the follower 120, the flap 101 bears against the guide profile 121 in the direction of the direction d101, at different support points of the guide profile 121 depending on the orientation of the flap 101 around the axis X101. As shown on the figure 7 , it is advantageously provided that it is a flat face of the flap 101 which bears against the member 120.

The clearance profile 123 is concave in the connecting rod plane P60 and extends between the guide profile 121 and the connecting rod 60. Due to the shape of the profiles 121 and 123, the member 120 has the general shape of a hook, in plane P60. Profile 123 receives edge 107 of flap 101 when flap 101 bears against guide profile 121. Thus, whatever the orientation of flap 101, flap 101 can only be in contact with member 120 at profile 121, for a single contact line. In other words, the profile 123 provides a clearance space for the pivoting of the flap 101 when contact is established with the profile 121.

The shutter actuator 102 comprises an electric motor, advantageously fixed to the frame 104. Here, the actuator 102 is fixed to one of the two brackets. Preferably, the shutter actuator 102 has an axis of rotation which is parallel to the axis X101. In addition to the electric motor, the actuator 102 advantageously comprises a reduction mechanism 108, here comprising a toothed wheel carried at the output of the electric motor, and a pinion, meshing with the toothed wheel and carried by the flap 101, coaxially with the axis X101. The rotation of the motor of the shutter actuator 102 therefore causes the shutter 101 to rotate around the axis X101 with respect to the frame 104, between the release position and the working positions.

Optionally, provision is made for the adjustment device to comprise a blocking means, as shown in the figure 6 And 7 . For example, the frame 104, in particular the bracket carrying the reduction mechanism 108, comprises a through housing 109, to receive a pin parallel to the axis X101, the pin then being received in a radial recess of the toothed wheel of the reduction mechanism 108, visible on the figure 6 And 7 . This blocking means makes it possible to block the flap 101 in a desired position. Thus, the shutter 101 is held in position against forces applied by the frames 11, in the event of leveling of the frames 11, in the event of an emergency stop, or during the installation of the loom, in order to secure a position of the frames 11. The pin is preferably actuated by a motor.

For each machine 2 for forming the crowd, when the blocking system 80 blocks the pivoting of the base 31 in the reference orientation, the movement of the flap 101 varies the center distance of the eccentric R1, in the case where the adjustment system is in the amplitude adjustment configuration. Indeed, the base 31 being immobilized, the displacement of the connecting rod 60 by the flap 101 via the member 120 causes a variation of the center distance R1 by radial translation of the connecting piece 32 with respect to the base, only degree of freedom then available. The shutter 101 is configured to be able to vary the center distance R1 over its entire adjustment stroke, by causing the connecting rod 60 to travel a displacement stroke to obtain an adjustment value corresponding to a desired crowd amplitude.

For each machine 2 for forming the crowd, when the blocking system 80 blocks the pivoting of the base 31 in the reference orientation, the movement of the flap 101 varies the center distance of the eccentric R2, in the case where the adjustment system is in height adjustment configuration. Indeed, the base 31 being immobilized, the displacement of the connecting rod 60 by the flap 101 via the member 120 causes a variation of the center distance R2 by relative translation of the ends 41 and 42 of the connecting rod 40, only degree of freedom then available. The flap 101 is configured to be able to vary the center distance R2 over its entire adjustment stroke, by causing the connecting rod 60 to travel a displacement stroke to obtain an adjustment value corresponding to a desired crowd height.

Thus, the adjustment of the crowd can be carried out via the device 100, in particular the flap 101, whether the actuator 102 is controlled by an automatic adjustment program, or by a person. Each actuator 20 is preferably a servomotor, or any other type of electric motor which allows piloting of the orientation of the rotor around the axis X20. In particular, each actuator 20 comprises a encoder and/or a sensor system, the measurement of which makes it possible to determine the orientation of the output shaft 28, and therefore implicitly by conversion, the position of the base 31 of the eccentric system 30, around the axis X20, by relative to the frame 12, knowing the geometry of the system. Each actuator 20 advantageously comprises output plugs, connectable to a network 22 of the loom 1, such as a measurement bus, to transmit said measurement.

As an alternative to the adjustment system 100, the machine 2 comprises an adjustment device 1100, shown in the figures 17 to 20 . Like the device 100, the adjustment device 100 has the function of performing the adjustment of the shedding machine 2, in the case where the machine 2 is in height adjustment configuration and in the case where the machine 2 is in the amplitude adjustment configuration, and while the blocking system 80 is in the blocking configuration. For this, the adjustment device 1100 is capable of actuating the respective connecting rods 60 of the machines 2 in the adjustment configuration, via their respective follower member 120.

A single adjustment device 1100 is advantageously provided, which is shared between the machines 2.

The adjustment device 1100 mainly comprises a flap 1101, in place of the flap 101, to move the connecting rods 60 via their respective follower member 120, as well as a partially represented flap actuator 1102, to actuate the flap 1101. The device 1100 advantageously comprises a frame 1104 instead of the frame 104. The adjustment device 1100 is placed close to the connecting rods 60, for example above the connecting rods 60, as shown on the figures 17 to 20 .

The frame 1104 is a fixed part with respect to the frame 12, being secured to the structure of the loom. The frame 1104 supports the shutter 1101 and the actuator 1102. The frame 1104 here also comprises two brackets, each formed by a folded sheet. Each of these brackets is linked to a respective fixed crosspiece, belonging to the loom, not shown. The brackets are arranged on either side of the set of connecting rods 40, parallel to the axis X20.

Pane 1101 is similar to pane 101 except for a few differences discussed below. The flap 1101 is supported by the frame 1104, being pivotable with respect to the frame 1104 around a so-called "pilot" axis X1101, advantageously parallel to the axes X20 and to the axis of the shutter actuator 1102. In practice , the flap 1101 is supported by the brackets of the frame 1104, between said brackets. The brackets support the pivoting of the flap 1101 around the axis X1101 via the ends of the flap 1100. For this purpose, each bracket carries a respective bearing centered on the axis X1101 to support one of the ends of the flap 1101. By pivoting, the flap 1101 can move one or more connecting rods 60 by driving their follower member 120, similarly to the flap 101, to adjust the distance R1 or the distance R2, depending on the adjustment configuration current. As for the flap 101, by pivoting around the axis X1101, the flap 1101 is movable between a release position, shown on the figure 20 , where the flap 1101 is at a distance from the follower members 120, and from the working positions, shown on the figure 17 , 18 Or 19 , in which the flap 1100 bears against at least one of the follower members 120 to perform the adjustment.

The shutter actuator 1102 includes an electric motor similar to that of the actuator 102. Since the electric motor of the actuator 1102 is similar to that of the actuator 102, the electric motor of the actuator 1102 is not represented on the figures 17 to 20 . Only one axis of rotation X1102 of the electric motor is shown on the figures 18 to 20 . The electric motor of the actuator 1102 is fixed on the frame 1104, for example using a support 1130, in U, belonging to the frame 1104, itself fixed on one of the two brackets. Preferably, the axis of rotation X1102 is parallel to the axis X1101.

In addition to the electric motor, the actuator 1102 advantageously comprises a reduction mechanism 1108, here comprising a pinion 1131 carried by an output shaft of the electric motor, coaxial with the axis X1102, and a toothed wheel 1132, meshing with the pinion 1131 The toothed wheel 1132, pivoting around an axis X1133 parallel to the axes X1102 and X1101, is carried by a control shaft 1133 coaxial with the axis X1133, being fixed in rotation to the shaft 1133, for example by pinching. The shaft 1133 is supported by the two brackets of the frame 1104, for example via ball bearings, so as to be able to pivot, with the wheel 1132, around the axis X1133, relative to the frame 1104.

As shown on the figure 17 , the reduction mechanism comprises at least one, and preferably two control discs 1134, each carried at one of the opposite ends of the control shaft 1133, being integral in rotation with the shaft 1133. The shaft control 1133 is advantageously secured at each end by a screw respectively to the first and second control discs 1134 which extend outside the frame 104, respectively along each bracket. Each square of the frame 1104 is arranged between one of the discs 1134 and the toothed wheel 1132.

Each control disc 1134 defines a helical groove 1135 which extends approximately 360° facing the interior of the frame 1104, between a first end near the center of the disc 1135, and a second end at a maximum radius of the disc 1134. The first and second ends of the helical groove 1135 being close to being aligned with the center of the disk 1134. The disks 1135 are indexed around the control shaft 1133 so that the grooves 1135 are aligned with each other parallel and around the axis X1133.

The flap 1101 carries a hoop 1136 which comprises two arms 1137 which extend perpendicularly to the axis X1101, and which are arranged between the two brackets of the frame 1104. At their respective ends, the arms 1137 carry a respective pin 1138, parallel to the axis X1101 and belonging to the reduction mechanism 1108. Each pin 1138 extends through one of the brackets of the frame 1104, through a through groove 1139 of the bracket concerned, towards the outside of the chassis 104. The through groove 1139 has a bean shape, that is to say in an arc of a circle, centered on the axis X1101, which corresponds to the circular trajectory of the pin 1138 around the axis X1101 of the flap 1101 The pin 1138 circulates along the groove 1139, from one end to the other, during the rotation of the flap 1101. Preferably, the arms 1137 are held at a distance from each other by a reinforcement bar 1140 belonging to the arch 1136, for example fixed by a screw respectively on each of the arms 1137.

Each pin 1138 is received in one of the grooves 1135 in order to be guided by the groove 1135 of one of the control discs 1134. The movement of the flap 1101 is controlled by the rotation of the motor in a first or a second direction. , which causes a corresponding rotation of the shutter 1101 via the reduction mechanism 1108, in particular with rotation of the pinion 1131, rotating the wheel 1132, rotating the control shaft 1133, causing the rotation of the control discs 1134 which drive the displacement of each pin 1138 in the helical groove 1135. As shown on the figures 17 to 20 , the geometric definition of the helical groove 1135, transforms the rotation of the electric motor in the first direction into a displacement of the pin 1138 towards the center of the disc 1134, which causes the release of the flap 1101 either to reduce the crowd, or towards the release position where the flap 1101 which does not interfere with the follower finger 120, in particular so as not to interfere with the weaving. The rotation of the electric motor in the second direction, opposite to the first direction, controls the displacement of the pin 1138 towards the outside of the disc 1134, which causes the tilting of the flap 1101 in the opposite direction, towards an increase in the crowd. For the first direction as for the second direction, the pins 1138 rest on an internal track of the groove 1135, so that the forces generated by the weight of the frame 11 via the flap 1101 are directed radially towards the center of the control shaft 1133. Thus, the weight of the frames 11 is taken up by the connection between the pin 1138 and the groove 1135 and not by the electric motor. This has the advantage that the dimensioning of the electric motor of the actuator 1102 can be reduced, since the torque generated by the electric motor does not need to support, or retain, the weight of the frames 11.

THE figure 18 And 19 represent two different crowd settings in which the flap 1101 in the working position has been moved, between two respective angular positions of the control discs 1134 under the action of the electric motor of the actuator 1102. The figure 20 represents the flap 1101 in the release position where the pins 1138 reach a bottom of the groove 1135 of the control disc 1134.

The adjustment device 1100 has the advantage of being particularly robust and the forces in the mechanical joints of the adjustment device 1100 are reduced. Advantageously, the system retains the fall of the frame 11 while the adjustment device 1100 is in the adjustment configuration. Advantageously, the reduction offered by the complete mechanism makes it possible to multiply tenfold the efforts to maintain the electric motor, which requires a low torque to drive the flap 1101 and the frame 11 associated with the crowd adjustment. Advantageously, the dimensioned motor provided can be of small size and low power.

Alternatively, other geometric definitions can be employed to move the flap or other reduction mechanisms can be used.

The crowd-forming machine 2 advantageously comprises one or more actuator microcontrollers 23 for controlling the actuator 20 by controlling the power circuit 21 distributing electrical energy to this actuator 20, taking into account said measurement of the orientation of the output shaft 28, retrieved via the network 22.

The loom 1 advantageously comprises a master controller 24, which exchanges data with the actuator microcontroller(s) 23. The master controller 24 can execute a weaving program to control the weave of the loom, by controlling the actuators 20, and other programs, such as an adjustment program, a calibration program, etc. For piloting, the microcontroller 23 and/or the master controller 24 take account of a library, which includes certain data, in particular remarkable pre-recorded actuator positions, entered at the terminal, or else entered by calibration procedure. Advantageously, the controller has memories for the data libraries. A memory is suitable for recording current position data of the actuator or data relating to predetermined positions to be reached. For example, a memory can memorize the position of the rotary actuator corresponding to the stop position on a stop during the amplitude adjustment. The controller can call upon its memories and the position data at any time to carry out control steps. The controller is associated with a computer and a comparator in the servo of the actuator which make it possible to quantify the movements necessary to reach predetermined positions. In particular, the controller knowing the current position of the actuator calculates the predetermined angle corresponding to the foreseeable rotation according to the position a stop to be reached. The memories are configured to capture, store or restore this data to the controller.

The motor of the actuator 102 is preferably a servomotor and comprises an encoder and/or a sensor, the measurement of which makes it possible to determine the orientation of an output shaft of the motor. By converting this information, the machine knows the position of flap 101, and can deduce the adjustment made, when a follower member 120 is driven. Knowing the geometry of the system, in particular of the flap 101, of the reduction mechanism 108, the geometry of the components 120, the distance between the axis X101 and the line of contact between the flap 101 and the component 120, and of the shed adjustments previously operated, the machine is able to determine the positions to be reached during the amplitude or shed height adjustment. The weaving loom 1 advantageously comprises a flap microcontroller 103 to control the actuator 102. For example, the microcontroller 103 performs this control by controlling a power circuit distributing electrical energy to the actuator 102, taking into account of said output shaft orientation measurement, retrieved via the network. Master controller 24 exchanges data with microcontroller 103.

The loom 1 preferably comprises a terminal 25 to allow a person to control and/or configure the operation of the loom 1 via the master controller 24. For example, the terminal 25 offers the person the start of a step specific to an adjustment procedure, to confirm that a manual step has been carried out and/or to enter parameters. The terminal 25 is used to display information on the progress of the procedure and to indicate warning signals for the attention of the user.

A shed forming assembly is defined as a subassembly of the loom 1, including the shed forming machines 2, the adjusting device 100 and the members 120.

The loom 1, and more particularly each machine for forming the shed 2, makes it possible to implement an adjustment method defined below and illustrated in the figure 12 .

The different drawing mechanism geometries belonging to the machines 2 of the weaving loom 1 cause the shutter 101 to be actuated in different angular ranges from one connecting rod 60 to another and/or from one weaving loom to another, to make the same setting. When the loom 1 has been assembled for the first time, or during a maintenance or calibration operation, it is advantageous to record in a data library, belonging for example to the controller 24, particular working positions of the shutter 101, constituting reference positions of the flap 101, by storing which crowd settings these corresponding reference positions. Thus, amplitude adjustment and/or height adjustment reference positions and the maximum and minimum stop reference positions are entered into the data library. In practice, the position of the output shaft or of the rotor of the actuator 102 is recorded, the position of which is sensed and which corresponds to the position of the flap 101. The position of the flap 101 is associated with the position of the member 120 when frame 11 is in position H11, in other words the reference positions of flap 101 correspond to configurations when the frame is set in high position H11.

For example, for each machine 2, the working positions of the shutter 101 are recorded as reference positions, corresponding to the case where the distances R1 and R2 are minimum, in the case where the distances R1 and R2 are maximum, in the case where the distance R1 is minimum while distance R2 is minimum and vice versa, and in case distances R1 and R2 are at a particular intermediate value. For example, the working positions of the shutter 101 are recorded corresponding to the cases where the frame 11 is positioned at the positions B11, H11 and P11, when the locking system is in the locked configuration and for a known height and amplitude adjustment. Advantageously, the working positions of the flap are recorded in the case where the frame 11 is in position H11 and for a known height and amplitude adjustment. Other reference positions corresponding to particular amplitude and shed height adjustment configurations are also stored, the machine or the operator being able to call on these configurations to adjust the adjustment system. Similarly, remarkable angular positions are recorded for each adjustment configuration, corresponding to different cases where the ends 41 and 42 are in abutment with respect to each other, and where the connecting piece 32 is in abutment with respect to at the base 31. Numerous configurations are possible, insofar as, depending on the height adjustment, the adjustment position of the shutter 101 to reach the amplitude adjustment stops changes, and vice versa. These data are recorded in the data library, physically at the memory level of the controller 24.

Knowing these remarkable angular positions in advance makes it possible later to detect any defects during the adjustment process or during weaving, in particular if the working position at which the flap 101 puts the pulling mechanism into abutment does not correspond to the reference position expected in the context considered.

The following concerns the adjustment process itself. Throughout the adjustment process, a reduction in the tension of the warp threads supported by the frames 11 is advantageously provided, to reduce the forces applied by the frames 11 on the machines 2. To begin the adjustment process, it is possible to provide that a person indicates to the loom 1 the launch of the adjustment process via the terminal 25. Also, provision is made to reduce the tension of the layers of warp yarns on the loom.

The actual adjustment method firstly comprises a step a for selecting the machine 2 or machines 2 to be adjusted. This step a comprises a step a1 of pivoting the base 31 of the machine 2 which it is desired to adjust, or of the machines 2 which it is desired to adjust, up to the reference orientation. This step a also preferably includes a step a2 of pivoting the base 31 of the other machines 2, which one does not wish to adjust, to the disengagement orientation. Step a2 is preferably carried out before step a1.

Thanks to step a2, the follower members 120 of the machines 2 that one does not wish to adjust are moved to a disengaged position, so as not to be driven by the flap 101 including when the flap 101 is in position of work. The displacement of these follower members 120 to the release position is advantageously obtained by displacement of the connecting rods 60 concerned under the action of the rotary electric actuators 20 of the machines 2 which one does not wish to adjust. The release position of the follower members corresponds for example to the low position B11 of the corresponding frames 11 along their stroke C11. Advantageously in this configuration, the locking means of the machines 2 concerned, in particular the screws 98, are not accessible to the technician, who therefore does not have the possibility of accidentally putting the machines 2 concerned in the unlocked configuration.

Thanks to step a1, the follower member 120 of the machine 2 which it is desired to adjust is moved to a docking position, in which the flap 101 is capable of driving the follower member 120 of this machine 2. The displacement of the follower member 120 to the docking position is therefore advantageously obtained by displacement of the connecting rod 60 which carries it under the action of the rotary electric actuator 20 of the machine 2 to be adjusted. The docking position of the member 120 corresponds for example to the high position H11 of the frame 11 along the race C11. Advantageously in this configuration, the locking means of the machine 2 to be adjusted, in particular the screws 98, are accessible to the technician, who can therefore easily put the machine 2 to be adjusted in the unlocked configuration, at a later stage.

Step a1 having been performed, a step a3 is performed for blocking the base 31 of the machine 2 to be adjusted, in the reference orientation. To do this, the locking system 80 is placed in the blocking configuration. Preferably, the terminal 25 invites the technician to perform this action. In practice, the technician places the pin 81 of the machine 2 to be adjusted in the locking position, as shown in the figure 8 And 9 . Preferably, for the other machines 2, it is not possible to accidentally put the locking system 80 in the locking configuration, since the pins 81 are mechanically prevented from being put in the locking position. Indeed, for each of these machines whose base 31 is previously oriented in the release orientation, the notch 85 is not aligned with the pin 81. Since the frame 11 is in the low position B11 when the base 31 is in the disengagement orientation, and that the tension of the warp threads has advantageously been released, the frame 11 tends to maintain the pulling system in this position, under the effect of gravity. It is therefore advantageously not necessary to provide a blocking of the base 31 of the machines 2 which are not adjusted and which have been placed in the release orientation, even if the electrical power supply to their actuators 20 is cut off.

As a variant, provision is made for the technician to carry out a preliminary step to placing the pin in the locking position, by means of the obturator 187 shown on the figures 21 to 24 .

In operation of the actuator 20, the shutter is in the nominal position shown on the figure 21 . When the shutter 187 is turned by the technician in a clockwise or counterclockwise direction by approximately 40° in the first rocking position, for example that shown in the figure 22 , the indexing finger 181 is disengaged from the lobe 190 so that the technician is free to access the indexing finger to perform the blocking step a3. To this end, the technician presses for example on the finger 181 left free by the shutter 187 to make it pass into the blocking position, as shown in the figure 23 .

After depressing the index finger 181 during blocking step a3, the shutter 187 is free to rotate further so that the technician covers the index finger 181 with the lobe 189 of the shutter 187, in a second rocking position shown on the figure 24 .

The shutter 187 being advantageously made of metal, and the lobe 189 forming a larger mass than the lobe 190, the shutter 187 naturally finds the nominal angular position of the figure 21 , by gravity, in which the lower lobe 189 centers in the lower part so that the upper lobe 190 finds a position covering the index pin 181 and the lower lobe 189 finds a position covering the head of the clamping screw 93. In particular, the lobe 189 covering a hole 192 arranged through the wall 86 and/or the housing 188, giving access to the clamping screw head 93. Access to the clamping screw and access to the indexing finger are thus prevented in the nominal angular position. The crowd adjustment sequence is therefore secure.

The shutter 187 is easily made by operations of cutting, bending and machining of an axis hole.

The use of this shutter 187 can be generalized to all the actuators 20 which are equipped with this shutter 187.

The use of such a shutter 187 minimizes the risk of involuntary actuation of the locking system 180, to avoid for example accidental pinning of the actuator 20 in operation, reduces the risk of tightening error in the adjustment sequence , and improves the general safety of the machine 2. In particular, the use of the shutter 187 avoids the involuntary adjustment of the screw 93 in a situation where the finger 181 is not previously in the locking position.

After step a3 and before step b, the method advantageously comprises a blocking control step a4, to verify that the blocking system 80 of the machine 2 to be adjusted has duly been placed in the blocking configuration. Step a4 is performed while flap 101 is in the disengaged position so as not to interfere with any movement of member 120. This step a4 is performed at reduced torque for actuator 20, to prevent breakage of the system lock 80 and/or actuator 20.

Step a4 comprises a step a'0 of controlling the rotation of the actuator 20, a step a'1 of verifying that the rotary electric actuator 20 has not rotated despite the rotation control, to verify that the system blocking 80 is duly in the blocking configuration. Step a4 then comprises a step a'2 of issuing an alarm, in the event that it has been established that the actuator 20 has rotated, indicating that the blocking system 80 is not in the blocking configuration . Otherwise, the process continues.

After step a, the method advantageously comprises a step b of moving the shutter 101 to the working position, under the action of the actuator 102. The working position is reached when the shutter 101 approaches the member 120 fitted to the machine 2 to be adjusted, this member 120 being in the docking position. The flap 101 just comes into contact with the member 120 in the docking position, but does not yet take up the forces applied to the connecting rod 60 coming from the frame 11, since the adjustment system of the machine 2 to be adjusted is still in locked configuration. It is advantageously provided to perform step b before setting the adjustment configuration, to avoid spontaneous adjustment under the effect of the forces applied by the frame 11.

Preferably, it is known in advance that the working position that the flap 101 will have to reach to dock the member 120 should be the same as the working position at which the flap 101 was positioned during a previous execution of the method. setting for this machine 2.

Furthermore, during step b, the members 120 fitted to the other machines 2 are not approached by the flap 101, since they are in the disengaged position.

The method comprises a step y of controlling the motor torque of the shutter actuator 102 during step b. In other words, the actuator 102 is actuated at reduced torque to perform step b, which avoids a risk of breakage. This step also makes it possible to verify that the contact of the member 120 with the flap 101 is duly established at the expected working position, so that if the actuator is limited before the expected position, or is not stopped at the expected position, the controller is able to detect an adjustment fault or probable loosening during weaving.

Once step b has been performed, the method comprises a step c of setting the adjustment configuration of the adjustment system of the machine 2 that it is desired to adjust. Setting configuration step c is carried out manually by the technician. The technician then chooses to put the adjustment system in the amplitude adjustment configuration or in the height adjustment configuration.

In the present example, the person loosens either the screw 93 without loosening the screws 98, to switch to the amplitude adjustment configuration, or the screws 98 without loosening the screw 93, to switch to the height adjustment configuration. Once in the adjustment configuration, the flap 101 picks up any forces applied by the frame 11, thus avoiding an unexpected misadjustment.

Preferably, the adjustment method comprises cutting off an electrical power supply to all of the rotary electric actuators 20 during step c of placing in adjustment configuration, for safety reasons. Without an electrical power supply, the actuators 20 cannot be activated, either automatically by the controller 24, or on command from a person. In other words, throughout step c, the actuators 20 are prevented from being set in motion automatically for safety reasons, while the technician manually operates the adjustment configuration setting.

After step c, the method comprises a step d of adjustment, which may take the form of a step d1 of adjustment of the distance R1, or of a step d2 of adjustment distance R2, depending on the current adjustment configuration, determined in step b.

Preferably, after step c and before step d, namely before step d1 or d2, the method comprises a preliminary control step j. Step j aims to verify that the desired adjustment configuration has duly been reached, that is to say that the correct screws have been loosened, and that they have indeed been loosened. This step j includes a step j0 for transmitting a setpoint for driving the shutter actuator 102 in rotation, that is to say for controlling the rotation of the actuator 102. This rotation control controls a rotation to the actuator 102 in a first direction, for example a direct direction. In practice, the actuator 102 executes the instruction until one of the stops is reached, to serve as a reference. At this time, a step j1 is provided for measuring the angle of rotation which has been described by the shutter actuator 102 or by the shutter 101 having executed this instruction. Depending on the situation, this stop corresponds to one of the minimum or maximum values of center distance, connecting rod R2 or eccentric R1. A step j'1 is then provided for comparing the measured angle of rotation with a predetermined angle corresponding to the predictable rotation according to the position of the stop, to establish whether the shedding machine 2 is in a situation nominal or in a fault situation, such as a loosening fault or an adjustment fault.

This prior check then includes a step j2 of transmission of a setpoint for driving the actuator 102 in rotation, in the opposite direction. In other words, the actuator 102 is controlled in rotation. In practice, the actuator 102 executes the instruction until it reaches another stop. This other stop corresponds to the other minimum or maximum value of center distance, connecting rod R2 or eccentric R1. These instructions are transmitted while the actuator 102 is clamped under the adjustment torque value, to avoid any risk of breakage if the stop is not encountered for the expected angular position, and also to be able to detect the resistance of the stop . The preliminary check includes a step j3 of measuring the angle of rotation described by the actuator 102, following the execution of the rotation instruction, where the actuator 102 is supposed to have driven the pulling mechanism of the first stop to the second stop via the member 120. The preliminary check includes a step j4 of comparing the angle measured with a target value which has been pre-recorded in the library, to establish whether the machine 2 is in a nominal situation, or in a fault situation, such as a loosening fault or an adjustment fault. In other words, the measured angle is compared with a predetermined angle corresponding to the foreseeable rotation according to the position of the adjustment stop.

For example, if the angle measured is zero or very small, it is identified that the adjustment system has remained in the locking configuration. This is a loosening fault. For example, if the measured angle corresponds to that of an amplitude adjustment range, while a setting in height adjustment configuration was desired, it is identified that the adjustment system has been put in adjustment configuration amplitude by mistake. This is another loosening fault. For example, if the measured angle corresponds to that of a range of height adjustment, whereas a setting in amplitude adjustment configuration was desired, it is identified that the adjustment system has been put in adjustment configuration height by mistake. This is another loosening fault. For example, if the measured angle corresponds to the sum of the ranges of height adjustment and amplitude adjustment, it is identified that the adjustment system has been placed in a configuration where the two distances R1 and R2 are variable, by loosening of all the locking means of the adjustment system. This is another loosening fault. For example, in the event that the measured angle of rotation does not correspond at all to an angle corresponding to the preceding situations, it may be a matter of an adjustment fault, indicating that an adjustment process carried out previously has been carried out. incorrectly or that the adjustment system has become out of adjustment during weaving.

When a fault is detected, a step j5 is provided for issuing an alarm, preferably to the attention of the person, for example via the terminal 25, to indicate to the person that a fault has occurred. , and the type of fault identified. The adjustment method is interrupted so that corrective measures can be taken, in particular performing step c of setting the adjustment configuration correctly. Otherwise, the method goes directly to step d1 or d2 of adjustment.

As a variant, the preliminary control step j can be carried out by controlling the achievement of a single stop from an expected range of angular displacement up to the first stop.

Preferably in the case of crowd amplitude adjustment, a training instruction is transmitted to the actuator 102 corresponding to a stroke from the minimum crowd amplitude adjustment value to reach the desired upper adjustment value, so that the flap moves the follower member against the direction of the forces of gravity. Preferably, in the case of shed height adjustment, a drive instruction is transmitted to the actuator 102 corresponding to a stroke from the minimum shed height adjustment value, to reach the desired upper adjustment value, of so that the flap moves the follower member against the direction of the forces of gravity.

In the case where step c has put the adjustment system in amplitude adjustment configuration, step d1 of adjustment of the eccentric center distance R1 is carried out. Step d1 is performed by driving the follower member 120 by means of the flap 101, itself actuated by the actuator 102. The flap 101 performs the adjustment by moving the connecting rod 60 via the member 120. In the if step c has put the adjustment system in height adjustment configuration, step d2 for adjusting the connecting rod center distance R2 is performed. Step d2 is performed by driving the follower member 120 by means of the flap 101, itself actuated by the actuator 102. The flap 101 performs the adjustment by moving the connecting rod 60 via the member 120.

The fact of providing that the base 31 is blocked in the reference orientation by the blocking system 80 makes it possible to perform step d1 of amplitude adjustment or step d2 of height adjustment by actuation of the actuator 102. To perform the adjustment, it is possible to provide that the actuator 102 is actuated on command from the person, for example via the terminal 25. For example, it is possible to provide that the person orders the actuator 102, via the terminal 25 , increments of rotation of the actuator 102 until reaching the desired setting for the amplitude or the height of the stroke C11. Provision can also be made for the person to order the actuator 102 to position the shutter 101 directly at a target angular value, with a view to achieving the desired adjustment. The actuator 102 is controlled in rotation according to a setpoint of target value or incremental value relating to a desired frame stroke amplitude or a desired frame stroke height. In other words, the rotational control of the actuator 102 comprises a target value or incremental value setpoint transmission to the actuator 102, relating to an increase or a decrease in an adjustment, among the adjustment of the distance of eccentric center distance R1 or connecting rod center distance adjustment R2.

The actuator 102 is thus driven by the predetermined value. Provision can also be made for the person to indicate the desired setting directly, and for the actuator 102 to then take the angular position necessary to achieve this setting, on the basis of the information contained in the library. Provision can also be made for the person to be able to check the adjustment thanks to the set of graduations carried by the pulling mechanism. To perform the adjustment, provision can also be made for the actuator 102 to be actuated automatically by the controller 24 to perform the adjustment without the intervention of the person, possibly under the supervision of the person, the controller 24 executing a pre-recorded adjustment program. To check whether the desired amplitude or height value has been reached, provision is advantageously made for the terminal 25 to indicate, on the basis of the angular position information provided by the actuator 102, the current setting.

During the adjustment step, whether it is step d1 or step d2, provision can be made for the motor torque of the actuator 102 to be clamped below the adjustment torque value. For verification of the adjustment by the person, it is possible to cut off the electrical power supply to the actuators 20 for safety reasons. Once the adjustment has been made, the angular position of the actuator 102 is stored in the library as the current adjustment for the machine 2 concerned. This adjustment value can be called upon later, for example during a new adjustment process.

Once step d2 of height adjustment has been performed, a new step c of setting the amplitude adjustment configuration can optionally be provided, followed by a new step d1 of amplitude adjustment. If it is step d1 of amplitude adjustment which has been performed first, a new step c of setting the height adjustment configuration can be provided, followed by a new step d2 of height adjustment. As seen above, the new step c of setting the adjustment configuration can be followed by a control step prior to the adjustment step. Step c requiring manual intervention, as seen above, it is possible to cut off the power supply to the actuators 20.

It is noted that, during steps b, c and d, while the locking system 80 is in the locking configuration and the base 31 is in the reference orientation, the connecting rod 40 of the machine 2 to be adjusted is parallel to the translation axis R32, which facilitates the calculations and constitutes an optimal position for the adjustment of the distances R1 and R2 by the flap 101. In addition, during the driving of the follower member 120 by means of the flap 101, in particular in step d, the flap 101 is continuously held in abutment against the follower member 120 in the retaining direction d101, against the forces applied by the frame of heddles 11 tending to move the connecting rod 60 in the opposite direction of the retaining direction d101.

Thanks to the invention, the result of the amplitude and/or shed height adjustment procedures allows the technician to visually observe the adjustment, at the level of the frame and the warp threads, since the frame is driven by the shutter actuator between two setting changes, in setting configuration.

Thanks to the invention, the means implemented for the adjustment of the shedding machines of the trade are pooled and allow precise adjustment based on a single controller 103 and an actuator 102. The setting is therefore reliable.

As an alternative to the use of the device 100, the adjustment step d1 and/or d2 can be carried out in accordance with the invention by the adjustment system 1100 illustrated in figures 17 to 20 .

Once the adjustment step d1 and/or d2 is completed, a step e of placing the adjustment system in locked configuration is implemented. This step is performed manually by the user, who locks the locking means, here by tightening the screws 93 or 98 which had been loosened during step c. For safety reasons, provision is advantageously made for the power supply to the actuators 20 to be cut off during this step. During this step e, the blocking system 80 is still in the blocking configuration to keep the base 31 stationary. Once this step is completed, the distances R1 and R2 are fixed, since the ends 41 and 42 are secured and since the connecting piece 32 is secured with the base 31.

Preferably, once step e of placing in locked configuration is completed, a step f of locking control is implemented, in order to ensure that the machines 2 are duly in locked configuration after the manual intervention of the person. For this locking control step f, the locking system 80 is maintained in the locking configuration. For this locking control step, the power supply is restored. Preferably, the torque of actuator 102 is clamped below the setting torque value to prevent breakage. The locking control step f comprises a step of transmission of a rotation drive instruction by the flap actuator 102, a measurement of the angle of rotation described by the flap 101 while the actuator 102 has executed this drive instruction, and a comparison of the measured angle of rotation with a target value, to establish whether the adjustment system is duly in the locked configuration, or in a locking fault situation. In other words, a step f1 is provided for verifying that the shutter actuator 102 does not rotate, under the application of a predetermined torque value, the motor torque delivered being monitored during this measurement. To perform step f1, provision is made for actuator 102 to rotate in a direction which causes shutter 101 to drive member 120 in direction d101. In practice, to consider that the adjustment system is duly in the locked configuration, it is verified that the angle of rotation is zero or almost zero while the motor torque delivered is greater than the passive torque of the system, of the order of two times greater than the torque exerted on the actuator 102 by the weight of the frame and the transmission, insofar as, in the blocking configuration and in the locked configuration, the pulling mechanism is normally completely immobilized. In this case, the adjustment process is continued. On the contrary, it is considered that the locking system is not in the locked configuration when the actuator 102 has traversed a non-zero angle, or greater than a predetermined threshold. At this stage, we know that it is not a blocking fault, since the previous steps, in particular the adjustment step, have been able to be executed. Whether it is considered that the adjustment system is not in the locked configuration, a step f2 is provided including issuing an alarm, preferably to the attention of the person, for example via the terminal 25, signaling the fault locking. Then, the process is interrupted so that corrective measures can be taken. For example, step e of placing in locked configuration can be repeated, or corrective action can be triggered via the controller if the system has electronic locking means to be implemented.

After steps e and f, the method comprises a step g of authorizing the pivoting of the base 31, by setting the release configuration of the locking system 80, for the machine 2 which has just been adjusted. For this, the technician moves the pin 81 of the machine 2 in question to the unlocking position. During this step, the actuator 20 is powered to maintain the orientation of the base, for safety reasons. The pivoting of the base is no longer mechanically limited by the pin and can again be controlled by the actuator 20. The pivoting of the base 31 is then authorized. During this step g, provision may alternatively be made for a cut off of the electrical power supply to the actuators 20, where maintaining the alignment of the axes X42, X41 and X20 prevents the risk of the frame, which was set during this step, falling. stage. According to this variant, once step g has been executed, all the actuators 20 can again be powered.

After step g, the method advantageously comprises a step h of unlocking control, in order to ensure that the machine 2 which has been adjusted is duly in the release configuration after the manual intervention of the person on the pin 81. For this unlocking control step, the power supply is restored. Preferably, the torque of actuator 102 is clamped below the setting torque value to prevent breakage. The unlocking control step includes a transmission step of a rotation drive instruction by the shutter actuator 102, a measurement of the angle of rotation described by the shutter 101 while the actuator 102 has executed this drive instruction, and a comparison of the measured angle of rotation with a target value, to establish whether the locking system 80 is in the release configuration, or in an unlocking fault situation. In other words, a step h1 is provided for verifying that the shutter actuator 102 is actually rotating, when a predetermined torque value is applied with the actuator 102. The engine torque delivered is monitored during this measurement. To perform step h1, provision is made for actuator 102 to rotate in a direction which causes shutter 101 to drive member 120 in direction d101. In practice, to consider that the locking system 80 is duly in the release configuration, it is checked that the angle of rotation exceeds a predetermined value. In this case, the adjustment method is advantageously finished for this machine 2. On the contrary, it is considered that the locking system 80 is not in the release configuration when the actuator 102 has traversed a zero angle, or an angle that is too small. If it is considered that the blocking system 80 is not in the release configuration, a step h2 is provided including sending an alarm, preferably to the attention of the person, for example via the terminal 25, signaling the release fault. Then, the process is interrupted so that corrective measures can be taken. For example, step g of unblocking can be repeated.

Once all the steps a to h have been carried out, it is optionally provided for the person to confirm, via the terminal 25, that the adjustment process has been carried out successfully. The adjustment process can then optionally be carried out again to adjust another of the machines 2. Weaving can then be started with the new shed adjustment.

The adjustment method described above also applies, mutatis mutandis, to the other embodiments described below.

Alternatively, the adjustment method can be executed repeatedly to adjust the distance R1 successively for each machine, and then the adjustment method can be executed repeatedly to adjust the distance R2 successively for each machine, or vice versa.

Alternatively, several devices 100 are provided, each device 100 being respectively dedicated to adjusting one or more machines 2. Alternatively, a respective device 100 is provided for each machine 2.

As a variant, step c of setting the adjustment configuration is automated or assisted. To do this, for example, the manual locking systems presented above, here the screws 93 and 98, are replaced by automatic systems, including, for example, motors or electromagnets.

Alternatively, the blocking system 80 is automated. For this, for example, the pin 81 is actuated by an actuator, such as a cylinder.

As a variant, to actuate the flap 101, another type of actuator is provided than that described above, such as a jack, or two linear actuators at each axial end of the flap 101, to actuate the flap 101 by displacement of the follower member linearly parallel to the second connecting rods 60. In this case, provision can be made for the flap 101 not to pivot, but to slide in a direction parallel or almost parallel to the connecting rods 60.

As a variant, a sensor is provided which checks whether the locking system 80 is in the locking configuration or in the release configuration, for example by checking the position of the pin 81. Steps a4 and g are then modified accordingly.

Alternatively, a brake can be provided which, in the adjustment configuration of the adjustment system, brakes the frame 11, the connecting rod 60, the lever 50 and/or the lever 70, to prevent the frame from applying forces to the connecting rod. 60 by gravity.

As a variant, instead of providing that the flap bears only in the direction of the direction d101 against the member 120, provision is made for the flap to be able to press also in the opposite direction, in particular when the aforementioned brake is provided.

As a variant, during step c of the adjustment method, all the machines 2 are placed in the amplitude or crowd adjustment configuration. In step d1 which follows, the adjustment is carried out successively of all the machines 2, from the greatest amplitude to the lowest amplitude. The locking step e is carried out for each machine 2, as soon as this machine 2 is adjusted, and before adjusting the following machine 2. In the same way, in step d2 which follows, the adjustment is carried out successively of all the machines 2, from the greatest height to the lowest height. The locking step e is carried out for each machine 2, as soon as this machine 2 is adjusted, and before adjusting the following machine 2.

As a variant, in step a, several machines 2 are selected to be adjusted at the same time, these machines 2 then being adjusted with the same height adjustment and/or the same amplitude adjustment.

As a variant, the follower member 120 is configured to be actuated by one face and by the other face of the flap 101.

As a variant, the follower member 120 comprises two guide profiles turned in opposite directions, so as to be able to be driven in the direction d101 and in the opposite direction by pressing the flap against one or the other of the guide profiles.

Alternatively, several follower members 120 equip the same connecting rod 60.

As a variant, the follower member is formed by a housing provided in the connecting rod 60.

THE figures 13 to 15 show an eccentric system 230 for a second embodiment, with a loom identical to loom 1 of the figures 1 to 11 , except precisely for this eccentric system 230, replacing the eccentric system 30. The eccentric system 230, of different structure compared to the system 30, nevertheless performs the same functions. The elements of the eccentric system 230 which are similar or which have the same function as those of the eccentric system 30 are designated with the same reference sign increased by 200. Identical elements are designated with the same reference sign.

The eccentric system 230 comprises a base 231, which has the same function as the base 31, and a connecting piece 232, which has the same function as the connecting piece 32. The eccentric system 230 is rotated by the actuator 20, around the axis X20, via the base 231. The connecting piece 232 defines the axis of the eccentric X41 and is coupled to the end of articulation 41 of the connecting rod 40, of the same way as the connecting piece 32. In amplitude adjustment configuration, the connecting piece 232 is moved relative to the base 231 to modify the value of the distance R1. In the locking configuration, the part 232 is fixed relative to the base 231. As shown in the figure 15 , the blocking system 80 is not modified with respect to the embodiment of the figures 1 to 12 and works in the same way, blocking the rotation of the base 231 in the blocking configuration, and authorizing the rotation of the base 231 in the release configuration.

Along the axis X20, the base 231 is preferably arranged between the actuator 20 and the connecting piece 232. As shown in the figure 15 , the base 231 is directly formed by, or fixed on, the output shaft 28 of the actuator 20, so as to be directly driven in rotation around the axis X20 by the actuator 20. The axis X20 is fixed with respect to the base 31. The orientation of the output shaft 28 around the axis X20 corresponds to that of the base 231. Via the base 231, the eccentric system 230 as a whole is driven in rotation by the actuator 20 around the axis X20.

As illustrated on the figure 13 And 14 , so that the eccentric center distance R1 can be variable, the geometry of the eccentric system 230 is adjustable, and in particular the connecting piece 232 is made movable relative to the base 231. The adjustment system comprises means locking to selectively authorize this mobility, to obtain the amplitude adjustment configuration, and prohibit this mobility, to obtain the locked configuration or the height adjustment configuration. As for the eccentric system 30, it is provided that, so that the eccentric center distance R1 is adjustable when the adjustment system is in the amplitude adjustment configuration, the connecting piece 232 is movable in translation relative to the base 231, along a translation axis R232 which is perpendicular to the main axis X20. As for the eccentric system 30, provision is also made for the connecting piece 232 to be prevented from rotating with respect to the base 231 around the axis X20.

The base 231 here forms a discoid plate perpendicular to the axis X20, formed at one end of the output shaft 28. The base 231 also comprises a sliding lug 238. The lug 238 is formed projecting from the discoid plate, parallel to the axis X20. The lug 238 forms two sliding surfaces 279, which are directed away from each other. In the longitudinal direction, these surfaces 279 are directed parallel to the axis R232. In the transverse direction, these surfaces 279 are oriented parallel to the axis X20.

The connecting piece 232 includes the crank pin 235, visible on the figure 13 And 15 . In the example, the crankpin 35 is generally cylindrical in shape with a circular base, and is centered on the axis X41, to support the pivoting of the connecting rod 40 with respect to the connecting piece 32.

Instead of flange 36, connecting piece 232 comprises a fork 236. Fork 236 is fixed with crankpin 235. Along axis X20, fork 236 is arranged between crankpin 35 and base plate 231. The fork 236 comprises two sliding arms, which are parallel to the axis R232. The lug 238 is received between the two arms of the fork 236. Thus, the arms of the fork 236 and the lug 238 are arranged in the same plane perpendicular to the axis X20. Each arm of the fork 236 slides along one of the surfaces 279. Thus, the assembly formed by the fork 236 and the lug 238 forms a connection supporting the sliding of the connecting piece 232 along the axis R232 by relative to the base 231, while prohibiting the rotation of the connecting piece 232 around the axis X20 relative to the base 231. The translation of the piece 232 takes place between a first position shown on the figure 13 , corresponding to a maximum distance value R1, and a second position shown on the figure 14 , corresponding to a minimum distance value R1. The displacement of part 232 is limited between these two extreme positions, in that, as shown in the figure 14 , the lug 238 comes into abutment against a base of the fork 236, for the minimum distance value R1, and in that, as shown in the figure 13 , the lug 238 comes into abutment in the opposite direction against notches 239 carried at the end of the arms of the fork 236, for the maximum distance value R1. The fork 236 therefore forms amplitude adjustment stops.

To obtain that the connecting piece 232 is mobile to perform the adjustment, while being able to be selectively fixed in radial translation relative to the base 231 in the locked configuration, provision is preferably made for the locking means of the eccentric system 230 to comprise one or more clamping screw 293. The screws 293 have an orientation perpendicular to the axis X20 and are parallel to each other. In the locked configuration and in the height adjustment configuration, the screws 293 are in a tightening position, where the screws 293 tighten the sliding arms of the fork 236 on the lug 238. Then, the connecting piece 232 is secured with the base 231. In the amplitude adjustment configuration, the screws 293 are in a position for loosening the sliding arm on the lug 238, to allow the translation of the connecting piece relative to the base.

For example, as clearly visible on the figure 14 , each screw 293 passes successively through a first sliding arm of the fork 236, the lug 238, then a second arm of the fork 236, then a slider 294. Each screw 293 is screwed into the slider 294. For the screws to cross the arms of the fork 236 without hindering the movement of the part 232 in the amplitude adjustment configuration, each arm has an oblong orifice, visible on the figure 13 And 14 , through which the screw 293 passes, the oblong orifice being elongated parallel to the axis R232. The screw head is arranged against the first sliding arm of the fork 236, that is to say is opposite the shoe 294. By tightening the screw 293, the head of the screw 293 presses against the first arm of the fork 236, while the pad 294 presses in the opposite direction against the second arm. The lug 238 is then clamped between the two arms of the fork 236.

For this embodiment, the setting in locking and amplitude adjustment configuration is performed from the front end of the actuator 20, that is to say on the side of the eccentric system. As shown on the figure 15 , it is advantageously not necessary to provide a screw or a rod which passes through the actuator 20, so that this eccentric system 230 is easily adaptable to a pre-existing actuator.

There figure 16 mounts an eccentric system 430 for a third embodiment, with a loom identical to the loom 1 of the figures 1 to 11 , except precisely for this eccentric system 430, replacing the eccentric system 30. The eccentric system 430, of different structure compared to the system 30, nevertheless performs the same functions. The elements of the eccentric system 430 which are similar or which have the same function as those of the eccentric system 30 are designated with the same reference sign increased by 400. The identical elements are designated with the same reference sign.

The eccentric system 430 comprises a base 431, which has the same function as the base 31. The eccentric system 430 also comprises the connecting piece 32, which is identical to that of the system 30 and which performs the same function. Eccentric system 430 is driven in rotation by actuator 20, around axis X20, via base 431. Connecting piece 32 defines eccentric axis X41 and is coupled to the end hinge 41 of the connecting rod 40, as seen above. In the amplitude adjustment configuration, the connecting piece 32 is moved relative to the base 431 to modify the value of the distance R1. In the locking configuration, the part 32 is fixed with respect to the base 431. The locking system 80 is not modified with respect to the embodiment of the figures 1 to 12 and works in the same way, blocking the rotation of the base 431 in the blocking configuration, and authorizing the rotation of the base 431 in the release configuration.

In order to obtain that the distance R1 is variable when the adjustment system is in the amplitude adjustment configuration, the connecting piece 32 is supported by the base 431 while being movable in radial translation with respect to the base 431, following a translation axis R432. The connecting piece 32 is also prevented from pivoting with respect to the base 431, around the axis X20. The R432 axis is radial with respect to the X20 axis and is parallel to the distance R1. For any position of the connecting piece 32 with respect to the base 431, the axis R432 intersects the axis X20 and the axis X41. By displacement in translation of the connecting piece 32 with respect to the base 431 along the axis R432, the distance R1 is varied.

To obtain that the connecting piece 32 can be fixed relative to the base 431, it is preferably provided that the oblong orifice 77 of the flange 36, parallel to the axis R432, is crossed by a rod 78 of the eccentric system 430, identical to rod 78 of eccentric system 30.

In the present embodiment, the base 431 forms a plate perpendicular to the axis X20, against which the flange 36 is arranged, and further comprises two side rails, which project from the plate, and between which the flange 36 slide. To be precise, each rail forms a respective sliding surface 479, parallel to the axis R432. The sliding surfaces 479 are opposite. The outer edges of flange 36 each along one of the surfaces. The surfaces 479 thus guide the sliding of the connecting part 32 with respect to the base 431, along the axis R432, while preventing the rotation of the part 32 with respect to the base 431, around the axis X20. Thanks to these arrangements, it is advantageously not compulsory for the nut 94 to ensure this guiding in translation, contrary to what is provided for the eccentric system 30 described above.

Any characteristic described above for one of the embodiments or one of the variants can be implemented for the other embodiments and variants, as far as technically possible.

Claims (21)

Shed forming assembly, which comprises at least one shed forming machine (2), for actuating a heddle frame (11) of a loom (1) according to an alternating translation stroke (C11), along a frame axis (Z11), said at least one shedding machine (2) comprising: - a rotary electric actuator (20); - an actuator controller (23) capable of controlling the rotary electric actuator (20); - an eccentric system (30; 230; 430), which comprises: • a base (31; 231; 431) via which the eccentric system (30; 230; 430) is rotated by the rotary electric actuator (20), around a main axis (X20) perpendicular to the frame axis (Z11), and • a connecting piece (32; 232) defining an eccentric axis (X41), the eccentric axis (X41) being parallel to the main axis (X20); - a first lever (50), which is pivotable about a first lever axis (X50) to actuate said heald frame (11), the first lever axis (X50) and the main axis (X20) being parallel ; - a second lever (70), which is pivotable about a second lever axis (X70) to actuate said heald frame (11), the second lever axis (X70) and the main axis (X20) being parallel ; - a first connecting rod (40), which comprises: • a first joint end (41), via which the first connecting rod (40) is coupled to the connecting piece (32; 232), so that the eccentric system (30; 230; 430) and the first connecting rod (40) are pivotable relative to each other around the eccentric axis (X41), the eccentric axis (X41) and the main axis (X20) being spaced apart an eccentric center distance (R1), and • a second joint end (42), via which the first connecting rod (40) is coupled to the first lever (50), so that the first lever (50) and the first connecting rod (40) are pivotable relative to each other about a connecting rod axis (X42), which is parallel to the main axis (X20), the connecting rod axis (X42) and the eccentric axis (X41) being separated by a connecting rod center distance (R2); And - a second connecting rod (60), which is coupled to the first lever (50) and to the second lever (70), to secure the pivoting of the second lever (70) to the pivoting of the first lever (50); characterized in that said at least one shedding machine (2) comprises: - an adjustment system, which includes locking means (93, 98; 293, 98) and which allows: • at least one adjustment configuration, among: ◊ an amplitude adjustment configuration, in which the locking means (93, 98; 293, 98) allow movement of the connecting piece (32; 232) relative to the base (31; 231; 431) to the eccentric center distance (R1) is adjustable, and ◊ a height adjustment configuration, in which the locking means (93, 98; 293, 98) allow movement of the second end of articulation (42) relative to the first end of articulation (41) so that the connecting rod center distance (R2) is adjustable; And • a locked configuration, in which the eccentric center distance (R1) and the connecting rod center distance (R2) are fixed, in that the locking means (93, 98; 293, 98) are configured so that the connecting piece (32; 232) is secured to the base (31; 231; 431) and so that the first hinge end (41) is secured to the second hinge end (42); And - a follower member (120), which equips the second connecting rod (60); and in that the shedding assembly comprises a flap (101), which is configured to move the second connecting rod (60) of said at least one shedding machine (2) by driving the member follower (120), in order to adjust the eccentric center distance (R1), in the case where the adjustment system is in amplitude adjustment configuration, and to adjust the connecting rod center distance (R2) , in the case where the adjustment system is in height adjustment configuration. Shedding assembly according to claim 1, in which several shedding machines (2) are provided, each for operating a respective heald frame (11), the shutter (101) being configured to move the second connecting rods (60) belonging respectively to the shed forming machines (2) by driving follower members (120) fitted to said second connecting rods (60). A shedding assembly according to claim 2, wherein: - the second connecting rods (60) of the shedding machines (2) are mounted side by side parallel to the main axis (X20); And - the flap (101) extends parallel to the first lever axis (X50), from one of the second connecting rods (60) to another of the second connecting rods (60), to drive at least one of the organs followers (120) equipping respectively one and the other of the second connecting rods (60), in the adjustment configuration of the adjustment system. A shedding assembly according to any preceding claim, wherein the flap (101) is pivotable about a steering axis (X101) parallel to the main axis (X20), to move the second link (60) by driving the follower (120) of said at least one shedding machine (2). The shedding assembly according to claim 4, wherein the shedding assembly comprises: - a flap actuator (102), which is configured to actuate the flap (101) by pivoting around the pilot axis (X1 01); And - a shutter controller (103), configured to control the shutter actuator (102). A shedding assembly according to any of claims 4 or 5, wherein the follower (120) of said at least one shedding machine (2) comprises: - a guide profile (121), which is convex in a connecting rod plane (P60), perpendicular to the first lever axis (X50), the flap (101) bearing against the guide profile (121), in different support points of the guide profile (121) depending on the orientation of the flap (101), to drive the follower member (120); And - a foot (122), via which the follower member (120) is integral with the second connecting rod (60), the foot defining a clearance profile (123) to receive a distal edge (107) of the flap ( 101) when the flap (101) bears against the guide profile (121), the clearance profile (123) being concave in the connecting rod plane (P60) and extending between the guide profile (121) and the second connecting rod (60). A shedding assembly according to any preceding claim, wherein the flap (101) is movable between: - a working position, adopted in the adjustment configuration, where the flap (101) bears against the follower member (120) in a retaining direction (d101), to retain the second connecting rod (60) by means of the follower member (120), against forces applied by the heald frame (11) by gravity on the first lever (50) and on the second lever (70), tending to move the second connecting rod (60) in the opposite direction to the retaining direction (d1 01); And - a release position, adopted in the locked configuration, which is reached by moving the flap (101) in the direction opposite to the retaining direction (d101) from the working position. Shedding assembly according to any of the preceding claims, wherein, in order for the eccentric center distance (R1) to be adjustable when the adjustment system is in the amplitude adjustment configuration, the link (32; 232) is movable in translation relative to the base (31; 231; 431), along a translation axis (R32; R232; R432) which is perpendicular to the main axis (X20). Shedding assembly according to claim 8, wherein the base (231; 431) comprises at least one sliding surface (279; 479) parallel to the axis of translation (R232; R432), through which the base (231; 431) guides the translation of the connecting piece (32; 232) along the translation axis while fixing the rotation of the connecting piece (32; 232), when the adjustment system is in amplitude setting configuration. A shedding assembly according to claim 9, wherein: - the base (231) comprises a sliding lug (238) forming two sliding surfaces (279), which are directed away from each other; - the connecting piece (232) comprises a fork (236) forming two sliding arms, which are parallel to the translation axis (R232) and which receive the sliding lug (238) between them, so that each sliding arm slides respectively along one of the two sliding surfaces (279); And - the locking means (293, 98) comprise a clamping screw (293), which: • in the locked configuration of the adjustment system, is in a clamping position of the sliding arms of the fork (236) on the sliding lug (238), to secure the connecting piece (232) with the base (231) , And • in amplitude adjustment configuration of the adjustment system, is in a loosening position of the sliding arms on the lug (238), to allow the translation of the connecting piece (232) relative to the base (231 ). A shedding assembly according to any of claims 8 or 9, wherein: - the locking means (93, 98) comprise a clamping screw (93) and a clamping nut (94), which are coaxial with the main axis (X20); - the connecting piece (32) comprises a flange (36), which extends perpendicularly to the main axis (X20) and which comprises an oblong orifice (77), the oblong orifice being elongated along the axis of translation (R32; R432) and receiving the nut; And - the flange (36) is axially tightened against the base (31; 431) by tightening the clamping nut (94) on the clamping screw (93), to secure the connecting piece (32) with the base ( 31; 431) when the adjustment system is in locked configuration. Shedding assembly according to any of the preceding claims, wherein said at least one shedding machine (2) comprises a blocking system (80), which allows a blocking configuration, where the locking (80) immobilizes the base (31; 231; 431) in a reference orientation around the main axis (X20), and a release configuration, where the locking system (80) allows the pivoting of the base ( 31; 231; 431) around the main axis (X20). A shedding assembly according to any preceding claim, wherein the first link (40) comprises a first link end (44), carrying the first hinge end (41), and a second link end (45), carrying the second articulation end (42), the first connecting rod end (44) and the second connecting rod end (45) being fitted so as to slide relative to each other along a sliding axis (R40), so that the connecting rod center distance (R2) is adjustable. Weaving loom (1), comprising the assembly for forming the shed according to any one of the preceding claims, as well as at least one frame of heddles (11) actuated according to the stroke in alternating translation (C11) following the frame axis (Z11) by said at least one shedding machine (2). Adjustment method, for adjusting said at least one shedding machine (2) belonging to the shedding assembly according to any one of claims 1 to 13, the adjustment method successively comprising: - A step (c) of setting the adjustment system in adjustment configuration; - in the case where the adjustment system is in amplitude adjustment configuration, a step (d1) for adjusting the eccentric center distance (R1), by driving the follower member (120) by means of the flap (101), moving the second connecting rod (60), and, in the case where the adjustment system is in height adjustment configuration, an adjustment step (d2) the connecting rod center distance (R2), by driving the follower (120) by means of the flap (101), moving the second connecting rod (60); And - a step (e) of setting the adjustment system in locked configuration. Adjustment method according to claim 15, in which the shedding assembly is according to claim 7, the adjustment method comprising, prior to step (c) of putting the adjustment system in adjustment configuration, a step (b) of moving the flap (101) to the working position. A method of adjustment according to claim 16, wherein the shedding assembly is according to claim 12, the method of adjustment comprising: - before step (b) of moving the flap (101) to the working position, a step (a1) of pivoting the base (31; 231; 431) to the reference orientation, then a step (a3) of locking the base (31; 231; 431) in the reference orientation, by placing the locking system (80) in the locking configuration; And - after step (e) of setting the adjustment system in the locked configuration, a step (g) of authorizing the pivoting of the base (31; 231; 431), by setting the release configuration of the locking system ( 80). Adjustment method according to claim 17, in which, when the base (31; 231; 431) is in the reference orientation, the eccentric system (30; 230; 430) and the first link (40) are positioned so that the main axis (X20), the eccentric axis (X41) and the connecting rod axis (X42) are coplanar and arranged successively in this order. A method of adjustment according to claim 17, wherein when the base is in the reference orientation, the eccentric system (30; 230; 430) and the first link (40) are positioned so that the eccentric axis (X41), the main axis (X20) and the connecting rod axis (X42) are coplanar and arranged successively in this order. A method of adjustment according to any one of claims 17 to 19, in which the shedding assembly is according to any one of claims 2 or 3, the method comprising a step (a) of selecting, in which: - the follower member (120) of the shedding machine (2) for which step (c) of setting the adjustment configuration is going to be carried out, is moved to a docking position in which the flap (101) is capable of driving the follower member (120), the displacement of the follower member (120) to the docking position being obtained by displacement of the second connecting rod (60) under the action of the rotary electric actuator (20) of this shedding machine (2); And - the follower member (120) of another shedding machine (2), for which the adjustment system will be in the locked configuration during step (c) of placing it in the adjustment configuration, is moved up to to a disengaged position so as not to be driven by the flap (101), the displacement of the follower member (120) to the disengaged position being obtained by displacement of the second connecting rod (60) under the action of the electric rotary actuator (20) of said other shedding machine (2). Adjustment method according to one of Claims 18 or 19, in combination with Claim 20, in which: - the second connecting rod (60) of said shedding machine (2), for which step (c) of setting the adjustment configuration is going to be carried out, is actuated by the rotary electric actuator (20) of said shedding machine (2) until the main axis (X20), eccentric axis (X41) and connecting rod axis (X42) of said shedding machine (2 ) are coplanar; And - the second connecting rod (60) of said other shedding machine (2) is actuated by the electric rotary actuator (20) of said other shedding machine (2) until the axis main (X20), the eccentric axis (X41) and the connecting rod axis (X42) of said other shedding machine (2) are coplanar and arranged in a successive order where the eccentric axis (X41) and the connecting rod axis (X42) are inverted, with respect to the eccentric axis (X41) and the connecting rod axis (X42) of said shedding machine (2) for which the step (c) of adjustment configuration will be carried out.

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