Shedding machine for a loom and adjustment method

Abstract

A crowd-forming machine (2) comprising: an eccentric system (30) rotating about a main axis (X20); a lever (50); and a connecting rod (40) pivotally coupled to the eccentric system and the lever about eccentric (X41) and connecting rod (X42) axes separated by a connecting rod center distance (R2), the main axis (X20) and the eccentric (X41) axis being separated by an eccentric center distance (R1). To facilitate adjustment of the stroke of a frame of beams actuated by the machine, it includes an adjustment system allowing: an adjustment configuration where the eccentric (R1) or connecting rod (R2) center distance is adjustable, and a locked configuration where these distances are fixed. The machine (2) includes a locking system (80), which allows lever locking and lever release configurations.

Description

[0001] The present invention relates to a swarm forming machine for a loom, the loom including such a machine, and a method for adjusting this machine.

[0002] The invention relates to the technical field of crowd forming machines of the connecting rod actuator type to the frame, for a loom with heddle frames.

[0003] It is known to employ a plurality of electric actuators on the frame to drive the heddle frames in vertical oscillations. Depending on the technology used, the electric actuators produce either oscillating or continuous rotation. In both cases, each electric actuator drives its corresponding heddle frame via a draw mechanism, comprising a crank, connecting rods, and levers, which transforms the rotation produced by the actuator into a reciprocating translation of the heddle frame. During loom operation, particularly when changing items, it may be necessary to adjust the amplitude and height of the heddle frame's travel. Changing the amplitude is equivalent to changing the opening angle of the warp threads. Changing the height is equivalent to changing the height of the warp thread lay.

[0004] EP14989208A1 describes a crowd formation device including an oscillating electric actuator. In this case, the amplitude and height of the beam frame stroke depend on the actuator's oscillating stroke. However, implementing an oscillating actuator, rather than a continuously rotating one, imposes significant design constraints, making it difficult to achieve a wide adjustment range or limiting the maximum load and speed the actuator can handle.

[0005] FR2977592A1 and FR2734610A1 each describe a crowd-forming device in which a stile-operating lever is connected to the connecting rod-crank system via an adapter or bracket, the position of which is manually adjustable along an arm belonging to the lever and which can be secured with a clamping screw. However, manually adjusting this type of system can be tedious and difficult to achieve precise results.

[0006] DE102008032718B3 describes a crowd-forming device in which the eccentricity of an eccentric device is adjustable by moving a connecting rod drive eccentric disc relative to a connecting element, which is itself rotated by the actuator. The adjustment is made manually using an adjusting rod. A disadvantage of this type of adjustment is that the adjustable parts may be difficult to access, a large number of tightening and loosening steps are required, and a high level of skill is needed to perform the adjustment.

[0007] EP 3 831 991 A1 describes a crowd training unit with an adjustable crank.

[0008] The invention aims to remedy the drawbacks of the prior art by proposing a new crowd formation machine where the adjustment of the reciprocating translation stroke of the frame of rails is facilitated.

[0009] The invention relates to a heddle-forming machine for actuating a heddle frame of a loom in a reciprocating translational motion along a frame axis. The heddle-forming machine comprises: a rotary electric actuator; a controller for controlling the rotary electric actuator; an eccentric system, which includes: a base through which the eccentric system is driven in rotation by the rotary electric actuator about a principal axis perpendicular to the frame axis, and a connecting piece defining an eccentric axis parallel to the principal axis; a lever, which pivots in oscillation about a lever axis to actuate said heddle frame, the lever axis and the principal axis being parallel;and a connecting rod, which comprises: a first articulated end, through which the connecting rod is coupled to the connecting piece so that the eccentric system and the connecting rod pivot relative to each other about the eccentric axis, the eccentric axis and the main axis being separated by a distance of the eccentric center distance, and a second articulated end, through which the connecting rod is coupled to the lever, so that the lever and the connecting rod pivot relative 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 distance of the connecting rod center distance.

[0010] According to the invention, the crowd-forming machine comprises: an adjustment system, which includes locking means and which preferably allows an amplitude adjustment configuration, in which the locking means allow a displacement of the connecting piece relative to the base so that the eccentric center distance is adjustable; which allows a height adjustment configuration, in which the locking means allow a displacement of the second articulation end relative to the first articulation end so that the connecting rod center distance is adjustable; and which 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 fixed to the base and so that the first articulation end is fixed to the second articulation end;and a locking system, which allows a locking configuration, where the locking system blocks the orientation of the lever, when the lever is in a reference orientation, and a release configuration, where the locking system allows the lever to pivot.

[0011] A key idea of ​​the invention is that, when the crowd-forming machine is in its adjustment configuration and the locking system is in its locked configuration, rotating the eccentric system alters the adjustment of the reciprocating stroke of the beam frame, since the lever is locked in its reference orientation by the locking system. Specifically, when the adjustment system is in its amplitude adjustment configuration, the connecting rod center distance is fixed, so a change in the orientation of the eccentric system's base around the main axis corresponds to a change in the eccentric center distance when the lever is locked.When the adjustment system is in height adjustment mode, the eccentric center distance is fixed, so that a change in the orientation of the eccentric system around the main axis corresponds to a change in the connecting rod center distance when the lever is locked. Advantageously, the rotation of the eccentric system can be performed by the rotary electric actuator, such that, in the adjustment mode, the adjustment can be carried out by executing a command to rotate the eccentric system via the rotary electric actuator, whether this command is transmitted by a person or by an automatic adjustment program.Once the lever has been locked in the reference orientation and the adjustment system has been set to the adjustment configuration, it is advantageously unnecessary to manually move parts of the crowd-forming machine to perform the adjustment. This reduces the risk of error, makes the adjustment less tedious, and allows for particularly precise adjustments. Alternatively, the eccentric system can be rotated manually to perform the adjustment.

[0012] The invention applies to cases where the machine has a height adjustment configuration, and to cases where the machine has both an amplitude adjustment configuration and a height adjustment configuration. The invention applies to a crowd training machine that includes a crowd height adjustment system, or includes a crowd height adjustment system and a crowd amplitude adjustment system.

[0013] Preferably, the locking system includes a stop, which, to block the pivoting of the lever, cooperates mechanically with the lever, and, to allow the pivoting of the lever, is clear of the lever.

[0014] Preferably, so that the eccentric center distance is adjustable when the adjustment system is in amplitude adjustment configuration, the connecting piece and the base pivot relative to each other around a crank axis, which is fixed relative to the base and relative to the connecting piece, and which is parallel to the main axis.

[0015] Preferably, the connecting piece includes a crankpin, coaxial with the crank shaft, and the base includes a pinch ring receiving the crankpin, the base carrying the connecting piece via the crankpin received in the pinch ring.

[0016] Preferably, the base includes a crankpin, coaxial with the crank shaft, and the connecting piece includes a pinch ring receiving the crankpin, the base carrying the connecting piece via the crankpin received in the pinch ring.

[0017] Preferably, the locking means include a clamping screw, which: in the locked configuration of the adjustment system, is in a clamping position of the pinch ring around the crankpin, to secure the connecting piece with the base, and in the amplitude adjustment configuration of the adjustment system, is in a position of loosening the pinch ring around the crankpin, to allow the connecting piece to pivot relative to the base, by pivoting the crankpin in the pinch ring.

[0018] Preferably, the base includes a cam groove defining a spiral around the main axis, and the connecting piece includes a follower finger, which travels along the cam groove to guide the connecting piece relative to the base, when the adjustment system is in amplitude adjustment configuration and thus vary the eccentric center distance.

[0019] Preferably, the eccentric system comprises: a flange, which extends perpendicularly to the main axis, which includes means for positioning the follower finger in the cam groove, and an oblong orifice elongated along an axis of translation; and a rod, which is coaxial with the main axis and which is received in the oblong orifice to support the flange via the oblong orifice.

[0020] Preferably, the locking means comprise a clamping screw and a clamping nut, which form the rod, the clamping screw and the clamping nut being mutually screwed along the main axis. Preferably, in the locked configuration of the adjustment system, the flange is fixed to the base, being axially clamped against the base by screwing the clamping screw into the clamping nut, to immobilize the connecting piece along the spiral path relative to the base and thus fix the eccentric center distance. Preferably, in the amplitude adjustment configuration, movement of the connecting piece relative to the base is permitted by loosening the clamping screw of the clamping nut.

[0021] Preferably, the 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 fitted together to slide relative to each other along a sliding axis, so that the center distance of the connecting rod is adjustable.

[0022] Preferably, the adjustment system includes adjustment stops, among: amplitude adjustment stops, limiting the displacement of the connecting piece to limit the variation of the eccentric center distance between a predetermined minimum eccentric center distance value and a predetermined maximum eccentric center distance value, in the case where the adjustment system can be put in the amplitude adjustment configuration; and height adjustment stops, limiting the displacement of the second end of the joint to limit the variation of the connecting rod center distance between a predetermined minimum connecting rod center distance value and a predetermined maximum connecting rod center distance value, in the case where the adjustment system can be put in the height adjustment configuration.

[0023] Preferably, the adjustment system includes at least one brake, among: an amplitude adjustment brake, configured to maintain the position of the connecting piece relative to the base below the application of a specified relative displacement force while the adjustment system is in amplitude adjustment configuration; and a height adjustment brake, configured to maintain the position of the second joint end relative to the first joint end below the application of a specified relative displacement force while the adjustment system is in height adjustment configuration.

[0024] Preferably, the adjustment system includes at least one set of graduations, among: a set of amplitude adjustment graduations, indicating an amplitude adjustment value dependent on the eccentric center distance; and a set of height adjustment graduations, indicating an amplitude adjustment value dependent on the connecting rod center distance.

[0025] Preferably, the controller is capable of controlling the rotary electric actuator to vary the eccentric center distance in the amplitude adjustment configuration or to vary the connecting rod center distance in the height adjustment configuration.

[0026] The invention also relates to a loom, comprising the sheaf-forming machine as defined above, and the heddle frame operated by the sheaf-forming machine.

[0027] The invention also relates to a method of adjusting the crowd formation machine as defined above.The adjustment process includes successively: a step of pivoting the lever to the reference orientation, by rotating the eccentric system while the adjustment system is in the locked configuration and the locking system is in the release configuration; a step of putting the locking system in the locked configuration; a step of putting the adjustment system in the adjustment configuration; preferably in the case where the adjustment system is in the amplitude adjustment configuration, a step of adjusting the eccentric center distance by rotating the eccentric system by a predetermined value; and in the case where the adjustment system is in the height adjustment configuration, a step of adjusting the connecting rod center distance by rotating the eccentric system by a predetermined value.

[0028] Preferably, for the adjustment stage, the rotational drive of the eccentric system is achieved by a rotational control of the rotary electric actuator.

[0029] Preferably, the rotary electric actuator is controlled to rotate according to a target value setpoint or an incremental value relative to a desired frame stroke or a desired frame height.

[0030] Preferably, the adjustment process includes a preliminary check step, carried out after the adjustment system setup step and before the adjustment step, the preliminary check step comprising: a step of rotating the rotary electric actuator in a first direction of rotation until it reaches an adjustment stop; a step of measuring a first angle of rotation described by the eccentric system having reached the adjustment stop; a step of comparing the first measured angle of rotation with a first predetermined angle corresponding to the expected rotation from the position of the adjustment stop to establish whether the crowd forming machine is in a nominal situation or in a fault situation, such as a loosening fault or an adjustment fault; and a step of issuing an alarm, in the event that it has been established that the crowd forming machine is in the fault situation.

[0031] Preferably, the preliminary check includes, before the first instruction transmission step: a rotation control step by the rotary electric actuator in a direction of rotation, opposite to the first direction of rotation, until a setting stop is reached; a measurement step of a second angle of rotation described by the eccentric system having reached the setting stop; and a comparison step of the second measured angle of rotation with a second predetermined angle corresponding to the rotation expected from the position of the stop, to establish whether the crowd forming machine is in a nominal situation or in a fault situation, such as a loosening fault or a setting fault.

[0032] Preferably, after the adjustment step, the adjustment process includes, successively: a step of putting the adjustment system into a locked configuration; and a step of putting the locking system into a release configuration.

[0033] Preferably, the adjustment process includes a blocking control step between the blocking system setting step and the adjustment system setting step, which includes: a verification step that the rotary actuator does not rotate under the application of a predetermined torque value, and a step of issuing an alarm signaling a blocking fault in the event that a rotational movement of the rotary electric actuator is detected.

[0034] Preferably, the adjustment process includes a locking control step, between the locking configuration step and the release configuration step, which includes: a verification step that the rotary electric 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 rotary electric actuator is detected.

[0035] Preferably, the adjustment process includes cutting off the power supply to the rotary electric actuator during the adjustment configuration step.

[0036] The invention and other advantages thereof will become more apparent in the light of the following description of embodiments according to the invention, given solely by way of example and with reference to the drawings below in which: [ FIG 1 ] There figure 1 is a partial perspective view of a loom equipped with four sheaf-forming machines, according to a first embodiment of the invention. FIG 2 ] There figure 2 is a perspective view, from another angle, of one of the crowd-forming machines of the figure 1 . [ FIG 3 ] There figure 3 is a partial longitudinal section of a connecting rod belonging to the machine of the figure 2 . [ FIG 4 ] There figure 4 is a front view of an actuator and an eccentric system belonging to the crowd-forming machine of figures 2 And 3 , where a connecting piece belonging to the eccentric system is shown cut in a vertical plane. FIG 5 ] There figure 5 shows several side views of the crowd-forming machine figures 2 à 4 illustrating the steps involved in setting up a blocking configuration. FIG 6 ] There figure 6 shows several side views of the crowd-forming machine figures 2 à 5 shown in amplitude adjustment configuration. FIG 7 ] There figure 7 shows several side views of the crowd-forming machine figures 2 à 6 shown in height adjustment configuration. FIG 8 ] There figure 8 is a partial perspective view of a loom equipped with four sheaf-forming machines, according to a second embodiment of the invention. FIG 9 ] There figure 9 is a perspective view of an eccentric system belonging to a crowd-forming machine, according to a third embodiment of the invention. FIG 10 ] There figure 10 is a perspective view of the eccentric system of the figure 9 , from another angle. FIG 11 ] There figure 11 is a partial front view of a crowd-forming machine according to a fourth embodiment, notably showing an eccentric system in a first configuration. FIG 12 ] There figure 12 is a view similar to that of the figure 11 , where the eccentric system is in a second configuration. FIG 13 ] There figure 13 is a cut of the crowd-forming machine figures 11 And 12 . [ FIG 14 ] There figure 14 is a perspective view of part of the crowd-forming machine of figures 11 à 13 . [ FIG 15 ] There figure 15 is a perspective view of another part of the crowd-forming machine of figures 11 à 14 . [ FIG 16 ] There figure 16 is a cross-section of a crowd-forming machine, according to a fifth embodiment of the invention. FIG 17 ] There figure 17 is a block diagram of an adjustment method according to the invention.

[0037] There figure 1 shows a first embodiment, including a loom 1 with heddle frames 11, a frame 12 and sheaf-forming machines 2 for operating the heddle frames 11. On the figure 1 , frames 11 are represented at a reduced scale in relation to machines 2.

[0038] Here, we plan four frames of beams 11 and four machines 2, each machine 2 respectively operating one of the frames 11.

[0039] Alternatively, a number of frames 11 other than four is provided. Alternatively, a number of machines 2 other than four is provided. Alternatively, it can be provided that the same machine 2 operates several frames of beams 11.

[0040] Each frame 11 advantageously comprises an upper crossbar 13, a lower crossbar 14 parallel to the crossbar 13, and two uprights 15 and 16, parallel to each other and connecting the crossbars 13 and 14. Preferably, the crossbars 13 and 14 are horizontal, while the uprights 15 and 16 are vertical. Each heddle frame 11 is equipped with a row of heddles, not shown, each connecting the crossbars 13 and 14 and arranged between the uprights 15 and 16, distributed along the crossbars 13 and 14. Each heddle has an eyelet through which a warp thread passes, the warp threads forming a web of warp threads. The loom 1 advantageously includes other components, such as a beater and means for inserting a weft thread, which are not shown.

[0041] For the purpose of weaving, each machine 2 is designed to actuate the corresponding heddle frame 11 along a reciprocating translational stroke C11, relative to the frame 12, along a frame axis Z11 specific to that frame 11. "Stroke" refers to the path traveled by the frame 11 during its movement. figure 1 shows the C11 race for frame 11 located in the foreground of the figure 1 Being moved by machine 2 along the stroke C11, the frame 11 is moved parallel to the axis Z11, in a rectilinear motion, going back and forth between an extreme high position H11, corresponding to an upper limit of the stroke C11, and an extreme low position B11, corresponding to a lower limit of the stroke C11. The axis Z11, and therefore the displacement of the frame 11, is preferably vertical, or at least parallel to the rails of the frame 11 considered.

[0042] During weaving, for the insertion of each weft thread, the position of the frames 11 along their respective paths C11 is determined independently for each frame 11 by the machines 2, to define the loom's sheave receiving the inserted weft thread. The loom 1 then produces a fabric of warp and weft threads with the desired weave.

[0043] Each crowd-forming machine 2 includes a rotary electric actuator 20, and a drawing mechanism comprising an eccentric system 30, a connecting rod 40, called a "transmission rod", a lever 50 and, preferably, a connecting rod 60, a lever 70, a connecting rod 17 and a connecting rod 18. The loom 1 includes a locking system 80, which is shared between the machines 2.

[0044] For each machine 2, each frame 11 is operated by said machine 2 by being operated by the electric actuator 20 of this machine 2, through the pull mechanism of this machine 2, connecting the actuator 20 to the frame 11.

[0045] The actuators 20 are advantageously identical, arranged side by side in the same orientation. 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, which comprises a stator 26, fixed relative to the frame 12, and a rotor driving an output shaft 28 of the actuator 20.

[0046] In this example, the stator 26 includes a frame, which comprises a cylindrical wall with a circular base centered on an axis X20, referred to as the "main axis," and a mounting plate 73 perpendicular to the axis X20, closing one front end of the cylindrical wall and serving to securely attach the stator 26 to the frame 12. The rotor, not visible in the figures, is supported by the stator 26 so as to pivot about the axis X20 relative to the stator 26. The rotor is coaxial with the axis X20 and is contained within the stator 26. The output shaft 28 is formed directly at one front end of the rotor and passes through the mounting plate to exit. When the actuator 20 is appropriately powered by a power circuit 21 belonging to the loom 1, the output shaft 28 is driven in rotation about the axis X20 by the rotor.In other words, to electrically supply the rotor and / or the stator 26 and control the actuator 20, the actuator 20 is electrically connected to the power circuit 21.

[0047] Alternatively, the rotor and output shaft can be provided for as separate and non-coaxial elements of the actuator 20, the rotor driving the output shaft via a reducer, the main axis X20 around which the output shaft rotates being parallel to the axis of rotation of the rotor.

[0048] For each actuator 20, the X20 axis is perpendicular to the Z11 axis. For each actuator 20, the main X20 axis is advantageously perpendicular to a plane defined by the frame of runners 11. The frames 11 are distributed parallel to the X20 axis of the actuators 20. Each pulling mechanism is advantageously coplanar with the frame 11 that it actuates. The actuators 20 are themselves slightly offset from each other parallel to the X20 axis, so that their output shaft 28 lies in the plane of the frame 11 and the pulling mechanism that it actuates. Since the frames 11 and the pulling mechanisms are distributed along parallel planes, they do not impede each other's movements.

[0049] 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 accessibility or space requirements of the loom 1.

[0050] 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.

[0051] As shown on the figure 1 For each pulling mechanism, the lever 50 pivots in oscillation relative to the frame 12, around an axis X50, called the "lever axis," parallel to the main axis X20. The lever 50 is advantageously coplanar with the frame 11 to be actuated. The lever 50 is connected to the frame 11 to be actuated via the connecting rod 17. For this purpose, the connecting rod 17 is attached to a radial arm 51, here approximately horizontal, belonging to the lever 50, by an articulation end allowing the connecting rod 17 to pivot relative to the lever 50 around an axis parallel to the axis X50, and is attached to the frame 11 by an articulation end allowing the connecting rod 17 to pivot relative to the frame 11 around an axis parallel to the axis X50. The articulation end 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 cross member 14.The two joints of the connecting rod 17 are approximately parallel to the axis Z11. Via the connecting rod 17, the oscillating pivoting of the lever 50 actuates and determines the reciprocating translation of the frame 11 along the stroke C11.

[0052] At any given moment, the orientation of the lever 50 relative to the frame 12 corresponds to a single position of the frame 11 along the stroke C11. During its oscillating rotation, the lever 50 pivots in a first direction to a maximum orientation, where the frame 11 is in the uppermost position H11, and then in the opposite direction to a minimum orientation, where the frame 11 is in the lowermost position B11. By moving from the maximum orientation to the minimum orientation and vice versa, the lever 50 causes the frame 11 to travel the entire stroke C11.

[0053] Similarly, if provided, the lever 70 pivots in oscillation relative to the frame 12, around an axis X70, called the "lever axis," parallel to the main axis X20. The lever 70 is advantageously coplanar with the frame 11 to be actuated. The lever 70 is connected to the frame 11 to be actuated via the connecting rod 18. For this purpose, the connecting rod 18 is attached to a radial arm 71, here approximately horizontal, belonging to the lever 70, by a hinge end allowing the connecting rod 18 to pivot relative to the lever 70 around an axis parallel to the axis X70, and is attached to the frame 11 by a hinge end allowing the connecting rod 18 to pivot relative to the frame 11 around an axis parallel to the axis X70. The articulation end 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 cross member 14.The two joints of connecting rod 18 are approximately parallel to axis Z11. Connecting rods 17 and 18 are advantageously parallel. Via connecting rod 18, the oscillating pivoting of lever 70 actuates and determines the reciprocating translation of frame 11 along stroke C11.

[0054] Levers 50 and 70 are synchronized in their pivoting motion during oscillation, so that they are in the same orientation relative to the frame 12, around their respective axes X50 and X70. This is achieved, as shown in the... figure 1 The connecting rod 60 is attached to a radial arm 52 of the lever 50, here a vertical arm, by a hinge end allowing the connecting rod 60 to pivot about the lever 50 around an axis parallel to the X50 axis, and to a radial arm 72, here a vertical arm, of the lever 70, by a hinge end allowing the connecting rod to pivot about the lever 70 around an axis parallel to the X70 axis. The connecting rod 60 is approximately parallel to the cross members 13 and 14 of the frame 11. 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.An actuation of the lever 50 in 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 reciprocating translation by both levers 50 and 70 at the same time, via the connecting rods 17 and 18. The eccentric system 30 includes a base 31 and a connecting piece 32.

[0055] Along the X20 axis, the base 31 is preferably positioned between the actuator 20 and the connecting piece 32. The base 31 is fixed to the output shaft 28 of the actuator 20, so that it is directly driven in rotation about the X20 axis by the actuator 20, relative to the frame 12. The X20 axis is fixed relative to the frame 12 and to the base 31. The orientation of the output shaft 28 about the X20 axis corresponds to that of the base 31. Via the base 31, the entire eccentric system 30 is driven in rotation by the actuator 20 about the X20 axis. Conversely, the rotation of the eccentric system 30 about the X20 axis drives the rotor in rotation about the X20 axis.

[0056] The lever 50 is driven by pivoting in oscillation, that is, with a change of direction, by the continuous rotation of the eccentric system 30, that is, without a change of direction, via 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 purpose, the connecting rod 40 comprises, at a first end, a joint end 41, and, at a second end, a joint end 42.

[0057] The connecting rod 40 is attached to the connecting piece 32 of the eccentric system 30 via the articulation end 41. Through this articulation end 41, the connecting rod 40 and the connecting piece 32 pivot relative to each other about an axis X41, called the "eccentric axis." The axis X41 is fixed relative to the connecting rod 40 and to the connecting piece 32 and is parallel to the axis X20. The axes X41 and X20 are separated by a distance R1, which is the center-to-center distance between the axes X41 and X20. This distance R1 is called the "eccentric center-to-center distance." When the eccentric system 30 rotates about the axis X20, the axis X41 rotates about the axis X20.

[0058] In the present example, the articulation end 41 comprises a circular flange centered on the axis X41 and which receives within it a crankpin 35 belonging to the connecting piece 32, the crankpin 35 being pivotally supported within the flange, by means of a bearing 43, here a rolling element bearing, centered on the axis X41.

[0059] By means of the articulation end 42, the connecting rod 40 is attached 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 case, by means of this articulation end 41, the connecting rod 40 and the lever 50 are pivotable relative to each other about an axis X42, called the "connecting rod axis". The X42 axis is fixed relative to the connecting rod 40 and to the lever 50. The X42 and X50 axes are parallel and spaced apart, so that the arm 52, to which the joint end 42 is attached, acts as a lever arm for actuating the lever 50 by the connecting rod 40. When the connecting rod 40 is driven by the eccentric system 30, the X42 axis rotates about the X50 axis. The X42 axis is also parallel to and spaced apart from the X20 axis.Axes X41 and X42 are parallel and separated by a distance R2, which is a distance measuring the center distance between axes X41 and X42. This distance R2 is called the "connecting rod center distance".

[0060] In the present example, the articulation end 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, are traversed 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.

[0061] Each 2-piece loom forming machine includes a setting system that allows for a locked configuration and one or more setting configurations. In the locked configuration, the center distances R1 and R2 are fixed. To perform weaving, the setting system must be in the locked configuration. In the locked configuration of the setting system and during loom weaving operation, the center distances R1 and R2 cannot be changed. For each setting configuration, one of the center distances R1 and R2 is adjustable, while the other center distance R1 or R2 is fixed.Here, the adjustment system allows switching between a locked configuration, an amplitude adjustment configuration where the center-to-center distance of eccentric R1 is variable while the center-to-center distance of connecting rod R2 is fixed, and a height adjustment configuration where the distance R2 is variable while the distance R1 is fixed. Alternatively, the adjustment system could be configured to switch only between the locked configuration and one of the other configurations, namely the height adjustment configuration.

[0062] Due to the structure of the draw mechanism, changing the center-to-center distance of the eccentric R1 correspondingly changes the stroke amplitude C11, that is, the distance between the uppermost position H11 and the lowermost position B11 of the frame 11 when it is driven by the actuator 20 while the adjustment system is in the locked position. In this case, the greater the distance R1, the greater the stroke amplitude C11, meaning the greater the distance between positions B11 and H11. Therefore, changing the center-to-center distance of the eccentric R1 allows for modification of the amplitude of the crowd opening controlled by the frame 11.For example, the distance R1 is expected to vary from 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 reference position P11, i.e., with positions B11 and H11 equidistant from position P11. The reference position P11 is defined as a central position, which can correspond to the crossing position of the loom 1 for all the warp threads.

[0063] Due to the structure of the drawbar mechanism, changing the center-to-center distance of connecting rod R2 correspondingly changes the height of the stroke C11 relative to the frame 12, that is, the height of the stroke C11 relative to the reference position P11 of the frame 11 relative to the frame 12 along the axis Z11, shown in the diagram. figure 1 In particular, increasing the connecting rod center distance R2 shifts both the extreme positions H11 and B11 upwards relative to position P11. Conversely, decreasing the connecting rod center distance R2 shifts both the extreme positions H11 and B11 downwards relative to position P11. Preferably, changing the distance R2 does not alter the stroke C11, that is, it does not change the distance between positions B11 and H11. Modifying the center distance of connecting rod R2 therefore allows the crossing of the crowd to be modified by adjusting the opening height of the crowd controlled by the frame 11. For example, it is expected that the distance R2 can be varied from -6 mm to +6 mm relative to a central value, corresponding to a height offset of the stroke C11 of -8 mm to +8 mm relative to the reference position P11.

[0064] As illustrated on the figures 2 , 4 And 6, so that the center distance of eccentric R1 can be variable, the geometry of the eccentric system 30 is modular, and in particular the connecting piece 32 is made movable relative to the base 31. The adjustment system includes locking means to selectively allow this mobility, to obtain the amplitude adjustment configuration, and to prohibit this mobility, to obtain the locked configuration or the height adjustment configuration.

[0065] In this example, to make the center-to-center distance of eccentric R1 adjustable when the adjustment system is in amplitude adjustment configuration, the connecting piece 32 and the base 31 pivot relative to each other about an axis X32, referred to as the "crank axis." The axis X32 is fixed relative to the base 31 and the connecting piece 32 and is parallel to the axis X20. The axes X41 and X32 are not coaxial. When the connecting piece 32 is rotated relative to the base 31 around the axis X32, the axis X41 is displaced relative to the axis X20 along a circular path centered on the axis X32, thus varying the distance R1, as shown in the diagram. figure 6 . In this sense, the connecting piece 32 constitutes a crank in relation to the base 31.

[0066] In the example, as more clearly seen on the figure 4 The base 31 consists of a part that is generally flat in a plane perpendicular to the axis X20. The base 31 has a main opening 33, which receives the output shaft 28 of the actuator 20 so that the base 31 is fixed to this shaft. Several fastening elements are also provided, here four screws 34, distributed around the axis X20, to ensure the rotational rigidity of the base 31 with the output shaft 28 and / or with the rotor of the actuator 20.

[0067] The base 31 also includes a pinch ring 94, with two jaws radially surrounding the crank shaft X32. The connecting piece 32 forms a crankpin 95, visible on the figure 4 The crankpin 95 is a cylindrical element with a circular base, centered on the axis X32, and received within the jaws of the complementaryly shaped ring 94. The crankpin 95 projects in the opposite direction to the crankpin 35 received in the articulation end 41, and is offset from the latter. The clamping of the crankpin 94 around the crankpin 95 is achieved by a clamping screw 93, the head of which bears against one of the jaws of the ring 94, the body of which passes through this jaw and is screwed into a thread in the other jaw. The screw 93 is advantageously oriented in an orthoradial direction with respect to the axis X32, that is to say, a direction perpendicular to a radius from the axis X32, and in a plane orthogonal to the axis X32.Tightening screw 93 tends to bring the jaws closer together, which causes centripetal clamping forces to be applied to ring 94 on crankpin 95, resulting in a clamping torque. Base 31 carries connecting piece 32 via its crankpin 95, in that the crankpin 95 is received in the clamping ring 94.

[0068] The ring 94, the crank 95, and the screw 93 are part of the locking mechanism of the adjustment system. The component 32 and the base 31 can be joined by tightening the screw 93 around the crank 95. In the tightened position, the screw 93 clamps the ring 94 around the crank 95, applying a sufficiently high torque to ensure that, during weaving, the component 32 remains stationary relative to the base 31. Therefore, in the locked configuration, the screw 93 is placed in the tightened position. In amplitude adjustment configuration, the screw 93 is put in a position to loosen the ring 94 around the crankpin 95, so that the ring 94 and the crankpin 95 form a pivot joint, allowing and guiding the pivoting of the part 32 relative to the base 31 around the axis X32.

[0069] Preferably, the adjustment system includes braking means, in particular an amplitude adjustment brake. This amplitude adjustment brake ensures that, in the loosening position of screw 93, the tightening torque exerted by ring 94 on crankpin 95 is non-zero, thus constituting a braking torque which, while allowing the connecting piece 32 to pivot relative to the base 31, resists this pivoting. More generally, when the adjustment system is in the amplitude adjustment configuration, the amplitude adjustment brake allows the connecting piece 32 to move relative to the base 31, but nevertheless brakes this movement by applying a torque and / or a braking force. This prevents the adjustment of distance R1 from being immediately altered by the machine's own weight when the adjustment system is put in the amplitude adjustment configuration.This reduces the need for the actuator 20 to be equipped with a motor brake, which is economically advantageous. The braking torque ensures a force below the application of a predetermined relative displacement force, such that the amplitude adjustment brake is configured to maintain the position of the connecting piece 32 relative to the base 31 below the application of a predetermined relative displacement force while the adjustment system is in amplitude adjustment mode. This predetermined relative displacement force can be calculated based on the weight of the parts, the frame and the pulling mechanism, the lever arms, or the friction between parts. The actuator is capable of exceeding this relative displacement force to rotate the base 31 and perform the adjustment.

[0070] In this case, the amplitude adjustment brake, shown only on the figure 4 The assembly includes a locking screw 91. To obtain the locking torque, the clamping screw 91 slightly tightens the pinch ring 94 around the crankpin 95. The clamping screw's head bears against one of the jaws of the ring 94, optionally via a set of Belleville-type spring washers. The body of the screw 91 passes through this jaw and is screwed into the other jaw. The screw 91 extends, for example, parallel to the screw 93, with its head facing in opposite directions. Thus, the screw 91 is advantageously oriented in an orthoradial direction with respect to the X32 axis. To adjust the locking torque, the screw 91 is tightened or loosened.

[0071] There figure 6 shows a case 6A corresponding to an intermediate amplitude adjustment configuration, where part 32 is oriented so that the distance R1 takes an intermediate eccentric center distance value, a case 6B corresponding to a minimum amplitude adjustment configuration where part 32 is oriented so that the distance R1 takes a minimum center distance value, and a case 6C corresponding to a maximum amplitude adjustment configuration where part 32 is oriented so that the distance R1 takes a maximum center distance value. Preferably, the adjustment system includes amplitude adjustment stops, to limit the displacement, i.e. here the pivoting, of the connecting piece 32 with respect to the base 31, around the axis X32, between the position shown in case 6B where the distance R1 takes the minimum value of eccentric center distance and the position shown in case 6C where the distance R1 takes the maximum value of eccentric center distance.The movement of part 32 therefore occurs only between these two positions, without going beyond them. For example, to create the amplitude adjustment stops, the base 31 carries a stop screw 38, which is mounted in the base 31 parallel to the X20 axis, so that one head of the screw 38 protrudes from the surface of the base 31 on the side of the connecting part 32. In place of the screw 38, any suitable protruding part can be used as a stop. To create the amplitude adjustment stops, the connecting part 32 has two shoulders 39, which frame the stop screw 38. As shown in the figure. figure 6 For cases 6B and 6C, the screw 38 alternately abuts against one and then the other of the shoulders 39, so that the pivoting stroke of the part 32 is limited. As shown in the figure 6 For case 6A, the screw 38 moves freely between the shoulders 39 to obtain the intermediate values ​​of the distance R1.

[0072] As illustrated on the figures 3 And 7 To allow for a variable center-to-center distance between connecting rod R2, the connecting rod's articulation ends 41 and 42 are movable relative to each other. The adjustment system includes locking means to selectively allow this mobility, for the height adjustment configuration, and to prevent this mobility, for the locked configuration or the amplitude adjustment configuration.

[0073] In this example, in order for the center distance of connecting rod R2 to be adjustable when the adjustment system is in height adjustment configuration, the ends 41 and 42 slide relative to each other, along a sliding axis R40 intersecting the axes X41 and X42, or at least parallel to the connecting rod 40. For example, the connecting rod 40 includes a connecting rod end 44, carrying the end 41, and a connecting rod end 45, carrying the end 42, the end 44 being slidably fitted into the end 45, which is in the form of a sleeve to receive the end 44, in the form of a rod, and guide its sliding along the axis R40.

[0074] To form the locking means for the adjustment system, the connecting rod 40 is provided, for example, with a bracket 96, a pad 97, and at least one clamping screw 98, here three. The heads of the screws 98 are accessible from the outside of the connecting rod 40. The bracket 96 and the pad 97 are arranged inside the sleeve of the end piece 45 and together form a locking clamp for the stem of the end piece 44. The bracket 96 and the pad 97 are arranged in a pincer-like position on either side of the end piece 44. The pad 97 is fixed relative to the end piece 45 and is interposed between a wall of the sleeve and the stem of the end piece 44.The stirrup 96 is positioned between the other wall of the fork leg and the stem of the end piece 44, and is free to move in translation along a direction perpendicular to the axis R40, between a clamped position, where the stem of the end piece 44 is clamped between the stirrup 96 and the pad 97, such that the end piece 44 is immobilized along the axis R40 relative to the end piece 45, and a loosened position, where the stem of the end piece 44 is sufficiently loose to slide. Tightening the clamping screws 98 moves the stirrup 96 to the clamped position. Loosening the clamping screws 98 allows the stirrup to return to its loosened position.

[0075] Preferably, the braking means of the adjustment system include a height adjustment brake. This height adjustment brake ensures that, even when the locking means for the connecting rod 40 are loosened, the clamping force applied by the bracket 96 on the rod of the end piece 44 is not zero, so as to constitute a braking force. This braking force, while allowing the ends 41 and 42 to slide relative to each other, resists this sliding. More generally, when the adjustment system is in the height adjustment configuration, the height adjustment brake allows the relative movement of the ends 41 and 42, but nevertheless brakes this movement by applying a torque and / or a braking force. This prevents the adjustment of the distance R2 from being immediately altered by the machine's own weight when the adjustment system is put in the height adjustment configuration.This reduces the need for the actuator 20 to be equipped with a motor brake, which is economically advantageous. The braking torque ensures a force below the application of a predetermined relative displacement force, such that the height adjustment brake is configured to maintain the position of the second joint end 42 relative to the first joint end 41 below the application of a predetermined relative displacement force while the adjustment system is in the height adjustment configuration. This predetermined relative displacement force can be calculated based on the weight of the parts, the frame and the pulling mechanism, the lever arms, or the friction between parts. The actuator is capable of overcoming this relative displacement force to cause a relative displacement of the ends 41 and 42 and thus achieve the adjustment.

[0076] In this case, the height adjustment brake, visible only on the figure 3 , includes at least one spring 92, here two. To obtain the braking force, a slight clamping of the caliper 96 on the rod of the tip 44 is ensured by elastic compression of the springs 92 even when the screws 98 are loosened.

[0077] There figure 7 shows a case 7A corresponding to a neutral height configuration, where the ends 41 and 42 are arranged so that the distance R2 takes on a center-to-center distance value, i.e., corresponding to the case where positions B11 and H11 are equidistant from the reference position P11. The figure 7 shows a case 7B corresponding to a minimum height configuration, where the ends 41 and 42 are arranged so that the distance R2 takes a minimum connecting rod center distance value, i.e., corresponding to the case where the stroke C11 is offset towards its lowest height relative to the reference position P11. The figure 7 shows a case 7C 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, i.e., corresponding to the case where the stroke C11 is offset towards its highest height relative to the reference position P11. The figure 7 shows a 7D case corresponding to an intermediate height configuration, where the ends 41 and 42 are arranged so that the distance R2 takes an intermediate connecting rod center distance value, i.e. corresponding to the case where the stroke C11 is offset from the reference position P11, without being at the maximum.

[0078] Preferably, the adjustment system includes height adjustment stops to limit the displacement, i.e., the sliding motion, of the ends 41 and 42 along the axis R40, between the position shown in 7B where the distance R2 reaches its minimum connecting rod center distance and the position shown in 7C where the distance R2 reaches its maximum connecting rod center distance. The relative displacement of the ends 41 and 42 therefore occurs only between these two positions, without going beyond them. For example, to constitute the height adjustment stops, the sleeve of the end piece 45 includes a stop 46, formed by a parallelepiped block fixed by screws to the inside of the sleeve, and the stem of the end piece 44 includes a groove, forming two opposing shoulders 47, framing the stop 46.

[0079] As shown on the figure 7 For cases 7B and 7C, the stop 46 alternately abuts against one and then the other of the shoulders 47, so that the sliding stroke of the ends 41 and 42 is limited. As shown in the figure 7 for cases 7A and 7D, the stop 46 moves freely between the shoulders 47 to obtain the intermediate values ​​of the distance R2.

[0080] Preferably, the adjustment system includes a set of amplitude adjustment graduations, indicating an amplitude adjustment value that depends on the center-to-center distance of the eccentric R1. In this case, the graduations are marked, for example, on the base 31, while a reference mark is marked on the connecting piece 32, or vice versa. Preferably, the adjustment system includes a set of height adjustment graduations, indicating an amplitude adjustment value that depends on the center-to-center distance of the connecting rod R2. In this case, the graduations are marked, for example, on the shaft of the end piece 44, while the edge of the sleeve of the end piece 45 serves as a reference mark.

[0081] In the locked configuration of the adjustment system, used particularly during weaving on loom 1, the rotation of the eccentric system 30 around the axis X20 relative to the frame 12 by the actuator 20 causes the movement of the heddle 11 via the draw mechanism. While the rotation of the eccentric system 30 remains constant, the levers 50 and 70 pivot in oscillation, and the heddle 11 moves in alternating translation. With each complete rotation of the eccentric system 30 around the axis X20 relative to the frame 12, the levers 50 and 70 pivot in one direction and then the other, returning to their initial position, and the heddle 11 travels the stroke C11 in both directions and returns to its initial position. In detail, when the eccentric system 30 makes a first half-turn, the frame 11 is driven from the extreme low position B11 to the extreme high 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.

[0082] The 80 locking system allows for a locking configuration, shown on the figures 2 , 6 And 7 , as well as on the 5D case of the figure 5 , and a release configuration shown on the figure 1 and on case 5A of the figure 5 .

[0083] In the locking configuration, the locking system 80 locks the orientation of all the levers 50 of the loom 1 to a reference orientation, preferably corresponding to the case where the frames 11 are all positioned at the reference position P11. Thus, the levers 50 are all immobilized in a known orientation, namely the reference orientation. Preferably, the reference orientation is chosen to correspond to an orientation that the lever 50 takes when both the distance R1 is halfway between the minimum eccentric center distance value, illustrated in case 6B of the figure 6 , and the maximum eccentric center distance value, illustrated in case 6A of the figure 6 and at the same time the distance R2 is halfway between the minimum connecting rod center distance and the maximum connecting rod center distance. The reference orientation is chosen to correspond to an orientation that the lever 50 takes when the lever 50 is at the midpoint of its pivoting stroke in oscillation, the engine itself being at an angular position corresponding to the midpoint between the two reversal positions of the connecting rod 40 in its oscillation cycle.

[0084] In the release configuration, the locking system 80 does not prevent the pivoting of the levers 50. Advantageously, the locking system 80 is designed to lock all the levers 50. Alternatively, several locking systems 80 could be provided, each locking a group of levers 50 associated with a set of neighboring frames, or a single lever 50.

[0085] The locking system 80 is expected to be in the release configuration for weaving. The locking system 80 is expected to be in the locking configuration when the adjustment system is in the adjustment configuration. When the locking system prevents the pivoting of the lever 50 in the reference orientation, the rotary electric actuator 20 varies the center distance of the eccentric R1, provided the adjustment system is in the amplitude adjustment configuration. Indeed, with the lever 50 immobilized, rotating the base 31 by the actuator 20 causes a variation in the center distance R1 by rotating the base 31 relative to the connecting piece 32, around the axis X32. The center distance R1 is varied over its entire adjustment range by moving the base 31 through an angular sector, preferably less than half a turn, using the actuator 20, as shown in the figure. figure 6 When the locking system prevents the pivoting of lever 50 in the reference orientation, the rotary electric actuator 20 varies the center distance of the eccentric R2, provided the adjustment system is in height adjustment mode. With lever 50 immobilized, rotating the base 31 with actuator 20 causes a variation in the center distance R2 through relative sliding of the ends 41 and 42. The center distance R2 is varied throughout its adjustment range by rotating the base 31, preferably less than half a turn, using actuator 20, as shown in the figure. figure 7 Thus, the crowd adjustment can be performed via actuator 20, whether the actuator is controlled by an automatic adjustment program or by a person. Alternatively, the center-to-center distance of eccentric R1 can be varied by manually rotating the base 31 by the operator. In this alternative, the use of the graduated scale can be advantageous to assist the operator.

[0086] In this example, the locking system 80 comprises an upper rocker stop 81 and a lower rocker stop 82. The stop 81 is pivotally actuated relative to the frame 12, about an axis X81, by an actuator 83. The pivoting occurs between a stop position, where the stop 81 limits the pivoting of the lever 50 to the reference orientation by mechanically cooperating with the lever 50, for a first direction of rotation of the lever 50, and a release position, where the stop 81 is disengaged from the lever 50 so as not to impede its pivoting. The stop 82 is pivotally actuated relative to the frame 12, about an axis X82, by an actuator 84, independently of the orientation of the stop 81. The axes X81 and X82 are parallel to the axis X20.The pivoting action occurs between a stop position, where the stop 82 limits the pivoting of the lever 50 to the reference orientation by mechanically cooperating with the lever 50, allowing for a second direction of rotation of the lever 50, and a release position, where the stop 82 is disengaged from the lever 50 so as not to impede its pivoting. To mechanically cooperate with the stops 81 and 82, the arm 51 of the lever 50 has a lug 53 which abuts against one or the other of the stops 81 and 82 when the relevant stop is in the stop position. When both stops 81 and 82 are in the stop position, the locking configuration is achieved because the lug 53 is captured between the two stops 81 and 82, the lever 50 then being locked in the reference orientation.

[0087] Each actuator 20 is preferably a servomotor, or any other type of electric motor that allows control of the rotor's orientation around the X20 axis. In particular, each actuator 20 includes an encoder and / or a sensor system, the measurement of which determines the orientation of the output shaft 28, and thus implicitly, by conversion, the position of the base 31 of the eccentric system 30, around the X20 axis, relative to the frame 12, knowing the geometry of the system. Each actuator 20 advantageously includes output connectors, which can be connected to a network 22 of the loom 1, such as a measurement bus, to transmit said measurement.

[0088] The crowd formation machine 2 advantageously includes one or more actuator microcontrollers 23 to drive 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.

[0089] The loom 1 advantageously includes 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, commanding the actuators 20, and other programs, such as a setting program, a calibration program, etc. For control, the microcontroller 23 and / or the master controller 24 use a library, which includes certain data, notably pre-recorded actuator positions entered at the terminal, or entered via a calibration procedure. Advantageously, the controller has memories for the data libraries. One memory is suitable for storing current actuator position data or data relating to predetermined positions to be reached.For example, a memory can store the position of the rotary actuator corresponding to the stop position against a stop 39 during amplitude adjustment. The controller can access its memories and position data at any time to perform control steps. The controller is linked to a computer and a comparator in the actuator's control system, which quantify the movements required to reach predetermined positions. Specifically, knowing the current position of the actuator, the controller calculates the predetermined angle corresponding to the predicted rotation based on the position of a stop to be reached. The memories are configured to input, store, or retrieve this data to the controller.

[0090] Each actuator 83 and 84 is preferably a servomotor, or any other type of electric motor that allows for the control of the orientation of the stops 81 and 82 around their respective axes X81 and X82. In particular, each actuator 83 and 84 includes an encoder and / or a sensor system, the measurement of which determines the orientation of the stop in question. Each actuator 83 and 84 advantageously includes output terminals, connectable to a network 86 of the loom 1, such as a measurement bus, to transmit said measurement. The loom 1 advantageously includes one or more actuator microcontrollers 87 to control the actuators 83 and 84 by controlling a power circuit 85 distributing electrical energy to the actuators 83 and 84, taking into account said measurement of the orientation of the output shaft 28, retrieved via the network 86. The master controller 24 exchanges data with the actuator microcontroller(s) 87.

[0091] The loom 1 preferably includes 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 allows the person to start a specific step in a setup procedure, to confirm that a manual step has been completed, and / or to enter parameters. The terminal 25 is used to display information on the progress of the procedure and to provide warning signals to the user.

[0092] The loom 1, and more specifically each sheaf-forming machine 2, allows the implementation of an adjustment process defined below and illustrated on the figure 17 .

[0093] When the loom 1 is first assembled, or during maintenance or calibration, for all or part of the machines 2, notable angular positions are recorded for the rotor of the actuator 20, corresponding to available crowd configurations and the positioning of the frame 11 within its stroke. In particular, notable angular positions are recorded corresponding to the cases where the frame 11 is positioned at positions B11, H11, and P11, when the locking system is in the locked configuration. Other notable angular positions corresponding to crowd amplitude and height adjustment configurations are also stored; the machine or the operator can use these configurations to adjust the adjustment system.Similarly, specific angular positions are stored in memory for each adjustment configuration, corresponding to different cases where the ends 41 and 42 are against their limits, and where the connecting piece 32 is against its limit relative to the base. Numerous configurations are possible, since the angular position of the actuator 20 for reaching the amplitude adjustment limits changes depending on the height setting, and vice versa. This data is stored in the data library, physically in the controller's memory.

[0094] For example, one can choose to record, while the lever 50 is in the reference orientation, for a minimum, a median value and a maximum value of the distance R2, the minimum and maximum angular positions of the actuator 20, corresponding to the abutment of the screw 38 alternately with the shoulders 39, and, for a minimum, a median value and a maximum value of the distance R1, the minimum and maximum angular positions of the actuator 20, corresponding to the abutment of the stop 46, alternately with the shoulders 47. For example, the minimum angular position of the actuator is a first target value, or the maximum angular position of the actuator is a second target value, or both minimum and maximum angular positions are target values, if one wishes to perform setting fault detections.

[0095] Knowing these notable angular positions in advance makes it possible later to detect possible defects during the adjustment process or during weaving, in particular if the angular position at which the actuator 20 puts the drawing mechanism to a stop does not correspond to the notable angular position expected in the context considered.

[0096] In summary, the adjustment process itself comprises, firstly, step a, pivoting the lever 50 to the reference orientation by rotating the eccentric system 30 using the rotary electric actuator 20, while the adjustment system is in the locked position and the locking system 80 is in the released position. The process then comprises step b, which involves locking the locking system 80, thus immobilizing the lever 50 in the reference position. The process then comprises step c, which involves setting the adjustment system to the adjustment configuration. This can be either the amplitude adjustment configuration or the height adjustment configuration. When adjusting the height and amplitude, this is done sequentially, in the desired order.In the case where the adjustment system is in amplitude adjustment configuration, the method includes a step d1 for adjusting the center distance of the eccentric R1 by rotating the eccentric system 30 using the rotary electric actuator 20. The adjustment method uses data from memory, corresponding to a target value or an incremental value relative to a desired frame height. In the case where the adjustment system is in height adjustment configuration, a step d2 for adjusting the center distance of the connecting rod R2 is provided instead of step d1 by rotating the eccentric system 30 using the rotary electric actuator 20. The adjustment method uses data from memory, corresponding to a target value or an incremental value relative to a desired frame height.Once the adjustment is made, the process includes a step e involving locking the adjustment system. Finally, the process includes a step f involving releasing the locking system 80. Weaving can then be carried out with the new adjustment.

[0097] More specifically, for example, to start the adjustment process, it can be planned that a person indicates to trade 1 the launch of the adjustment process via terminal 25.

[0098] To perform steps a and b, the levers 50 first pivot to an orientation close to the reference orientation under the action of the actuators 20 controlled by the controllers 23 and 24, as shown in case 5A of the figure 5 While the system 80 is in its release configuration, all the lugs 53 are positioned above the stop 82. Advantageously, the actuators 20 position the eccentric system 30 so that the end 41 is positioned in a higher quadrant of rotation of the actuator 20, allowing the adjustment system to be accessible to the operator at a later stage. Then, under the action of the actuator 84 controlled by the controllers 24 and 87, the stop 82 is tilted into the stop position, as shown in case 5B. Next, under the action of the actuators 20 controlled by the controllers 23 and 24, the levers 50 are pivoted until they come against the stop 82, as shown in case 5C. At least for this step, it is anticipated that the motor torque of actuator 20 is limited below a predetermined setting torque value.With the torque thus limited, the stop 82 is brought into contact by the lever 50 without risk of breakage, and the actuator 20 can detect when the lever 50 is at its stop. If the actuator 20 is a servomotor, its power supply is cut off so that it no longer exerts motor braking, the weight of the frame 11 and the pulling mechanism keeping the lever 50 in contact with the stop 82. The angular position of the actuator 20 at this moment is stored as constituting the angular position corresponding to the reference orientation of the lever 50. Finally, under the action of the actuator 83 controlled by the controllers 24 and 87, the stop 81 is tilted into the stop position, as shown in case 5D. In this locking configuration, the assembly formed by the frame, the connecting rods, the levers, and the eccentric systems is fixed relative to the frame 12 of the loom 1.

[0099] In this example, steps a and b are therefore performed fully automatically, under the operator's control. Alternatively, manual steps are provided, particularly in the case of a non-motorized locking system, where the operator manually flips the stops 81 and / or 82. Alternatively, a single actuator flips both stops 81 and 82 with a time offset.

[0100] At this stage, before beginning step c, the process advantageously includes a so-called blocking check step, which aims to verify whether the blocking system 80 effectively immobilizes the lever 50. This step includes restoring power to the actuator 20, with the lever clamped below the set torque value. The blocking check step includes a step b1 to verify that the rotary electric actuator 20 is not rotating, including transmitting a rotation drive command by the actuator 20, i.e., a rotation command to the actuator 20, and then measuring the angle of rotation described by the eccentric system 30 while the actuator 20 has executed this drive command. Finally, step b1) includes comparing the measured angle of rotation with a target value to establish whether the blocking system 80 is correctly in the blocking configuration or in a blocking fault state.Preferably, the actuator 20 is rotated in both directions, allowing verification that the two stops 81 and 82 effectively lock the lever 50. In other words, it is verified that the rotary actuator does not rotate under the application of a predetermined torque value, the delivered motor torque being monitored during this measurement. In practice, to consider that the locking system 80 is properly in the locked configuration, it is verified that the angle of rotation is zero or almost zero while the delivered motor torque is greater than the passive torque of the system, approximately twice the torque exerted on the motor by the weight of the frame and transmission, since, in both the locked and locked configurations, the drawbar mechanism is normally completely immobilized. In this case, the adjustment procedure is continued.Conversely, the locking system is considered not to be in the locked configuration when the actuator 20 has traveled through a non-zero angle, or an angle greater than a predetermined threshold. At this stage, it is known that this is not normally a locking fault in the adjustment system, since a weaving operation may have been performed previously, a previous adjustment procedure may have been successfully carried out, or the person has not yet intervened to put the adjustment system in the locked configuration. In any case, if the locking system 80 is considered not to be in the locked configuration, a step b2 is planned, which includes issuing an alarm to the person, for example via terminal 25, indicating the locking fault. Then, the process is interrupted so that corrective measures can be taken. For example, steps a and b of pivoting the levers 50 and putting the system in the locked configuration can be repeated.Alternatively, it can be provided for step b2 that the controller triggers a corrective action if the system has electronic blocking means capable of following a new blocking step.

[0101] Step c, the adjustment configuration, is performed manually by the operator. For safety reasons, the power supply to actuator 20 is switched off while the operator moves the adjustment system from the locked configuration to the adjustable configuration. In practice, the operator unlocks the locking means manually. In this example, the operator either loosens screws 93 without loosening screws 98 to switch to the amplitude adjustment configuration, or loosens screws 98 without loosening screws 93 to switch to the height adjustment configuration. Once in the adjusted configuration, braking means 91 and / or 92 prevent the pulling mechanism from becoming misaligned under its own weight by preventing variation in the adjustable distance R1 or R2.

[0102] Preferably, the method includes a preliminary check, performed after step c and before step d1 or d2, to verify that the desired adjustment configuration has been correctly achieved, i.e., that the correct screws have been loosened and that they have indeed been loosened. This preliminary check includes a step c0 of transmitting a rotational drive command to the system 30 by the actuator 20, i.e., of controlling the rotation of the actuator 20. In practice, the actuator 20 executes the command until one of the stops is reached, which serves as a reference. At that point, a step c1 is performed to measure the angle of rotation that has been described by the eccentric system 30 that executed this command. Depending on the situation, this stop corresponds to one of the minimum or maximum center distance, connecting rod, or eccentric values.We then plan a step c1' of comparison of the measured angle of rotation with a predetermined angle corresponding to the rotation foreseeable according to the position of the stop, to establish whether the crowd forming machine 2 is in a nominal situation or in a fault situation, such as a loosening fault or a setting fault.

[0103] This preliminary check then includes a step c2 of transmitting a command to rotate the system 30 in the opposite direction via the actuator 20. In other words, the actuator 20 is commanded to rotate. In practice, the actuator 20 executes the command until it reaches another stop. This other stop corresponds to the other minimum or maximum value of the center distance, connecting rod, or eccentric. These commands are transmitted while the actuator 20 is limited below the set torque value to prevent any risk of breakage if the stop is not reached at the expected angular position, and also to be able to detect the resistance of the stop. The preliminary check includes a step c3 of measuring the angle of rotation described by the rotor, i.e., by the eccentric system 30, following the execution of the rotation command, where the actuator 20 is assumed to have driven the pull mechanism from the first stop to the second stop.The preliminary check includes a step (c4) comparing the measured angle with a target value pre-recorded in the library to determine whether machine 2 is in a nominal condition or in a fault condition, such as a loosening fault or an adjustment fault. In other words, the measured angle is compared with a predetermined angle corresponding to the expected rotation based on the position of the adjustment stop.

[0104] For example, if the measured angle is zero or very small, it indicates that the adjustment system has remained in the locked position. This is a loosening fault. For example, if the measured angle corresponds to that of an amplitude adjustment range, when a height adjustment configuration was desired, it indicates that the adjustment system was mistakenly set to the amplitude adjustment configuration. This is another loosening fault. For example, if the measured angle corresponds to that of a height adjustment range, when an amplitude adjustment configuration was desired, it indicates that the adjustment system was mistakenly set to the height adjustment configuration. This is another loosening fault.For example, if the measured angle corresponds to the sum of the height and amplitude adjustment ranges, it indicates that the adjustment system has been configured where both distances R1 and R2 are variable, due to the loosening of all the locking mechanisms of the adjustment system. This is another type of loosening fault. For example, if the measured rotation angle does not correspond at all to an angle corresponding to the previous situations, it may indicate an adjustment fault, suggesting that a previously performed adjustment procedure was carried out incorrectly or that the adjustment system became misaligned during weaving.

[0105] When a fault is detected, an alarm is issued in step c5, preferably to the person involved, for example via terminal 25, to inform them that a fault has occurred and the type of fault identified. The adjustment process is interrupted so that corrective measures can be taken, including correctly configuring the adjustment. Otherwise, the process proceeds directly to adjustment step d1 or d2.

[0106] Alternatively, the preliminary control step can be carried out by checking the attainment of a single stop from an expected angular displacement range up to the first stop.

[0107] By locking the lever 50 in its reference orientation using the locking system 80, the amplitude adjustment step d1 or the height adjustment step d2 can be performed by actuating the actuator 20. To perform the adjustment, the actuator 20 can be actuated by a user command, for example, via the terminal 25. For instance, the user can instruct the actuator 20, via the terminal 25, to rotate it in increments until the desired amplitude or height of the stroke C11 is reached. Alternatively, the user can instruct the actuator 20 to position the output shaft 28 directly to a target angular value to achieve the desired setting. The rotary electric actuator 20 is rotated according to a target value or an incremental value relative to a desired frame stroke or frame height.In other words, the rotation control of the rotary electric actuator includes transmitting a target value or incremental value to the rotary electric actuator 20, relating to an increase or decrease in a setting, either the eccentric distance setting R1 or the connecting rod distance setting R2. The rotary electric actuator 20 is thus driven by the predetermined value. Alternatively, the user can directly indicate the desired setting, and the actuator 20 can then assume the necessary angular position to achieve this setting, based on the information stored in the library. The user can also verify the setting using the graduated scale on the pull mechanism.To perform the adjustment, the actuator 20 can also be automatically actuated by the controller 24 to perform the adjustment without human intervention, possibly under human supervision, with the controller 24 executing a pre-recorded adjustment program. To verify whether the desired amplitude or height value has been achieved, the terminal 25 advantageously indicates the current setting based on the angular position information provided by the actuator 20. All actuators 20 can be configured to adjust the machines 2 simultaneously, particularly if the adjustment is performed automatically based on the pre-recorded adjustment program.

[0108] During the adjustment step, whether it is step d1 or step d2, the motor torque of actuator 20 can be limited below the adjustment torque value. For verification of the adjustment by the operator, the power supply to actuator 20 can be disconnected for safety reasons. Once the adjustment is complete, the angular position of actuator 20 is stored in the library as the current setting for the relevant machine 2. This setting value can be recalled later, for example, during a subsequent adjustment procedure.

[0109] Once the height adjustment step d2 is completed, a further step c for amplitude adjustment configuration can be performed, followed by a further amplitude adjustment step d1. If the amplitude adjustment step d1 was performed first, a further step c for height adjustment configuration can be performed, followed by a further height adjustment step d2. As previously mentioned, the further adjustment configuration step c can be followed by a pre-adjustment check. Since step c requires manual intervention, as previously mentioned, the power supply to actuator 20 can be disconnected.

[0110] Once adjustment step d1 and / or d2 is complete, step e, which puts the adjustment system into its locked configuration, is implemented. This step is performed manually by the user, who locks the locking means, in this case by tightening screws 93 or 98. For safety reasons, it is advantageous to disconnect the power supply to the actuator 20 during this step. During this step e, the locking system 80 remains in the locked configuration to hold the levers 50 stationary. Once this step e is completed, the distances R1 and R2 are fixed, since the ends 41 and 42 are joined and the connecting piece 32 is joined to the base 31.

[0111] Preferably, once the locking-in step e is completed, a locking-in check step is implemented to ensure that the machines 2 are properly locked after manual intervention. For this locking-in check step, the locking system 80 is held in the locked position. During this locking-in check step, power is restored to the actuator 20. Preferably, the torque of the actuator 20 is limited below the set torque value.The locking control step includes transmitting a rotational drive command via actuator 20, measuring the angle of rotation described by the eccentric system 30 while actuator 20 has executed this drive command, and comparing the measured angle of rotation with a target value to determine whether the adjustment system is correctly locked or in a locking fault state. Preferably, the actuator 20 is allowed to rotate in both directions. In other words, a verification step e1 is provided to ensure that the rotary actuator does not rotate under the application of a predetermined torque value, with the delivered motor torque being monitored during this measurement.In practice, to determine that the adjustment system is correctly in the locked configuration, it is verified that the rotation angle is zero or nearly zero while the delivered motor torque is greater than the system's passive torque, approximately twice the torque exerted on the motor by the weight of the frame and transmission. This is because, in both the blocking and locked configurations, the drive mechanism is normally completely immobilized. In this case, the adjustment procedure continues. Conversely, the locking system is considered not to be in the locked configuration when the actuator 20 has traveled through a non-zero angle, or one greater than a predetermined threshold. At this stage, it is known that this is not a blocking fault, since the preceding steps, particularly the adjustment step, have been successfully completed.If the adjustment system is not in the locked configuration, a step e2 is required, which includes issuing an alarm, preferably to the person, for example via terminal 25, indicating the locking fault. The process is then interrupted so that corrective measures can be taken. For example, step e of putting the system into the locked configuration can be restarted, or a corrective action can be triggered via the controller if the system has electronic locking means that can be implemented.

[0112] To perform step f of configuring the blocking system to release, we essentially proceed in the reverse order compared to steps a and b, that is to say, we implement the steps presented on the figure 5 , from case 5D to case 5A. More precisely, starting from case 5D of the figure 5 The stop 81 is tilted into the release position using the actuator 83, resulting in case 5C, while the power supply to the actuator 20 is advantageously cut off. Next, the actuator 20 is powered so that it actuates the pulling mechanism to orient the lever 50 in such a way as to move the lug 53 away from the stop 82, thus resulting in case 5B of the figure 5 Finally, the stop 82 is moved to the release position, so that the locking system 80 is fully in the release configuration. Alternatively, step f can be modified according to the design of the locking system 80, potentially including a manual step, as explained above for the locking configuration step.

[0113] It is anticipated that the person will confirm, via terminal 25, that the adjustment process has been successfully completed. Weaving can then begin with the new crowd setting.

[0114] In the locked configuration of the adjustment system and in the locked configuration of the locking system, a movement command can be transmitted to the actuator 20, for example, by alternating commands in one direction of rotation and then in the opposite direction, by a back-and-forth motion. The available amplitude for rotating the rotor is then measured and analyzed by the controller 24. This amplitude reflects the sum of the clearances between the lever 50 and the eccentric system 30, particularly at the joints in the connecting rod 40 and lever 50 bearings. This amplitude can be interpreted by the controller 24 as mechanical clearances, based on the geometry of the relevant loom forming machine. This operation can be performed for each loom drawing mechanism. This operation can be carried out during the locking control step described above.Furthermore, it is possible to monitor the drift of these mechanical clearances during weaving cycles and compare all these measurements with each other and / or between different swarm forming machines to estimate the potential degradation of mechanical components and anticipate their replacement. Knowing the swarm height and amplitude for each swarm forming machine also allows for refining predictive damage calculation models and providing the operator with performance indicators or system utilization rates.

[0115] Optionally, when setting up the height adjustment configuration, the eccentric system 30 is oriented under the action of the actuator 20, so that the screw 93 is in an area inaccessible to the person, which reduces the risk of the person accidentally setting the adjustment system to the amplitude adjustment configuration by loosening the screw 93.

[0116] Optionally, a cover is provided to protect the 98 screws when setting the amplitude adjustment configuration, to reduce the risk of the person accidentally setting the adjustment system to height adjustment configuration by loosening the 98 screws. Similarly, a cover can be provided to protect the 93 screws when setting the height adjustment configuration.

[0117] Alternatively, the actuator 20 is provided to have braking means integrated into the casing, or the actuator 20 includes a braked reducer to drive the output shaft 28. These solutions address the problem of immobilizing the actuator 20 during manual interventions on the machine 2.

[0118] Alternatively, as a locking system, an actuator is provided to lock the lever 50 in place of the rocker stops 81 and 82. The lug 53 of the lever 50 is placed directly horizontally and locked by a suitable cylinder to act on the walls of the lug 53.

[0119] Optionally, the adjustment of frames 11 can be done iteratively to adjust the amplitudes and / or heights of C11 runs progressively, or by considering the crowd movement of a neighboring frame 11.

[0120] Alternatively, the lever 50 may have a different geometry, in particular having a horizontal arm for the connection to the connecting rod 17, a lower vertical arm to be attached to the connecting rod 60, and an upper vertical arm opposite its axis X50 to be attached to the transmission connecting rod 40. The upper position H11 and lower position C11 of the frame 11 are thus reversed with respect to the same stroke of the engine.

[0121] In an alternative not shown, the actuators 20 are installed head-to-tail on the frame 12.

[0122] Alternatively, connecting rods 17 and 18 are connected to frame 11 via cross member 14.

[0123] Alternatively, the loom is a double-bed loom.

[0124] Alternatively, the connecting piece is mobile relative to the base by translating, without rotation, along a radial translation axis which is fixed relative to the connecting piece, to vary the distance R1.

[0125] Alternatively, the height adjustment brake consists of an elastic caliper, replacing the caliper 96 and the springs 92, and applying an elastic force on the end piece 44 to brake the relative sliding of the connecting rod ends 44 and 45.

[0126] Alternatively, automatic means are provided to move machine 2 between the locked configuration and the adjustment configuration, including for example a motor or an electromagnet.

[0127] Alternatively, during weaving, the actuators 20 can be selectively actuated in a clockwise or counterclockwise direction of rotation, depending on the weave to be produced. In particular, when two actuators 20 are required to produce the same weave in a weaving configuration over several insertion cycles, one actuator 20 can be actuated clockwise and the other actuator 20 counterclockwise so that their operation is kinematically balanced and the movement of imbalances related in particular to the eccentric systems 30 is symmetrical for the loom, which limits the loads on the joints and protects the loom.

[0128] The process described above also applies, mutatis mutandis, to the other embodiments described below.

[0129] There figure 8 shows a second embodiment, with a loom 101 identical to loom 1 of the figures 1 à 7 except for the following differences. In the figures, the identical elements or elements with the same function provided for the embodiment of the figures 1 à 7 and subsequent embodiments are designated with the same reference symbols.

[0130] For the 101 loom of the figure 8 The locking system 80 has been replaced by a locking system 180, which includes a stop 181 in place of stops 81 and 82. To move between the release and locking configurations, the stop 181 is designed to translate along an axis Y181, perpendicular to the axes Z11 and X20, for example, under the action of a cylinder (not shown). The stop 181 is level with the lug 53 of the levers 50 when the levers 50 are in the reference orientation. The stop 181 includes a groove 182, parallel to the axis X20 and open towards the levers 50, into which the lugs 53 are received when the locking system 180 is in the locked configuration. In release configuration, the stop 181 is freed from the levers 50 by being moved back relative to the levers 50, the groove 182 then no longer opposing the pivoting of the levers 50.

[0131] THE figures 9 And 10show an eccentric system 230 for a third embodiment, with a loom identical to loom 1 of the figures 1 à 7 except precisely for this eccentric system 230, replacing the eccentric system 30. The eccentric system 230, of different structure compared to system 30, nevertheless performs the same functions.

[0132] The eccentric system 230 comprises a base 231 and a connecting piece 232.

[0133] Along axis X20, the base 231 is positioned between the actuator 20 and the connecting piece 232. The base 231 is fixed to the output shaft 28 of the actuator 20, so that it is directly driven in rotation about axis X20 by the actuator 20, relative to the frame 12. Axis X20 is fixed relative to the frame 12 and to the base 231. The orientation of the output shaft 28 about axis X20 corresponds to that of the base 231. Via the base 231, the entire eccentric system 230 is driven in rotation by the actuator 20 about axis X20. The lever 50 is driven in oscillatory rotation by the continuous rotation of the eccentric system 230 via the connecting rod 40.The articulated end 41 of the connecting rod 40 is coupled to the connecting piece 232, such that the connecting rod 40 and the connecting piece 32 pivot relative to each other about the eccentric axis X41, which is fixed relative to the connecting rod 40 and the connecting piece 232. The circular flange of the articulated end 41 receives within it a crankpin 235 belonging to the connecting piece 32, the crankpin 235 being pivotally supported within the flange by means of the bearing 43. The axes X41 and X20 are separated by the center distance of the eccentric R1. When the eccentric system 230 rotates about the axis X20, the axis X41 rotates about the axis X20.

[0134] In this example, to make the center-to-center distance of eccentric R1 adjustable when the adjustment system is in amplitude adjustment mode, the connecting piece 232 and the base 231 pivot relative to each other about an axis X232, referred to as the "crank axis." The axis X232 is fixed relative to the base 231 and the connecting piece 232 and is parallel to the axis X20. The axes X41 and X232 are not coaxial. When the connecting piece 232 is rotated relative to the base 231 around the axis X232, the axis X41 is displaced relative to the axis X20 along a circular path centered on the axis X232, thus changing the distance R1. In this sense, the connecting piece 232 acts as a crank relative to the base 231.

[0135] The base 231 consists of a part that is generally flat in a plane perpendicular to the axis X20. The base 231 has a main opening 233, which receives the output shaft 28 of the actuator 20 so that the base 231 is fixed to this shaft. Several fastening elements are also provided, here four screws 234, distributed around the axis X20, to ensure the rotational rigidity of the base 231 with the output shaft 28 and / or with the rotor of the actuator 20.

[0136] In this embodiment, the connecting piece 232 comprises a clamping ring 294, with two jaws radially surrounding the crank shaft X232. The base 231 forms a crankpin 295, which is received within the clamping ring 294. The crankpin 295 is a cylindrical element with a circular base, centered on the axis X232, and received within the jaws of the ring 294, which has a complementary shape. The crankpin 295 projects from the flat portion of the base 231, in the same direction as the crankpin 235, and is offset from the latter. Clamping of the clamping ring 294 around the crankpin 295 is achieved by a clamping screw 293, the head of which bears against one of the jaws of the ring 294, the body of which passes through this jaw and is screwed into the other jaw. The screw 293 is advantageously directed along an orthoradial direction relative to the axis X232.Tightening screw 293 tends to bring the jaws closer together, which causes centripetal clamping forces to be applied to ring 294 on crankpin 295, resulting in a clamping torque. The base 231 supports the connecting piece 232 via its clamping ring 294, in that crankpin 295 is received within the clamping ring 294.

[0137] The ring 294, the crank 295, and the screw 293 are part of the locking mechanism of the adjustment system. The component 232 and the base 231 can be joined by tightening the screw 293 around the crank 295. In the tightened position, the screw 293 clamps the ring 294 around the crank 295, applying a sufficiently high torque to ensure that, during weaving, the component 232 remains stationary relative to the base 231. Therefore, in the locked configuration, the screw 293 is placed in the tightened position. In amplitude adjustment configuration, the screw 293 is put in a position to loosen the ring 294 around the crankpin 295, so that the ring 294 and the crankpin 295 form a pivot joint, allowing and guiding the pivoting of the part 232 relative to the base 231 around the axis X232.

[0138] Preferably, the adjustment system includes an amplitude adjustment brake, not shown, similar to that provided for loom 1 of the figures 1 à 7 and shown on the figure 4 .

[0139] Preferably, the adjustment system for the implementation method of figures 9 And 10 includes amplitude adjustment stops to limit the displacement of the connecting piece 232 relative to the base 231, around the axis X232, between a position where the distance R1 takes the minimum value of the eccentric center distance and a position where the distance R1 takes the maximum value of the eccentric center distance. For example, to constitute the amplitude adjustment stops, the connecting piece 232 carries a stop screw 238, parallel to the axis X20, such that one head of the screw 238 protrudes from the surface of the connecting piece 232 on the side of the base 231. As more clearly visible on the figure 10 To create the amplitude adjustment stops, the base 231 has two shoulders 239, which frame the stop screw 238. The screw 238 alternately abuts against one and then the other of the shoulders 239, so that the pivoting stroke of the part 232 is limited. The screw 238 moves freely between the shoulders 239 to obtain the intermediate values ​​of the distance R1.

[0140] Alternatively, some 2 machines are equipped with the eccentric system 30 while other 2 machines of the same trade are equipped with the eccentric system 230, for example to optimize the footprint and accessibility of the locking means.

[0141] THE figures 11 à 14 show an actuator 320 and an eccentric system 330 for a fourth embodiment, with a loom identical to loom 1 of the figures 1 à 7 except specifically for actuator 320 and eccentric system 330, which replace actuator 20 and eccentric system 30. Actuator 320 and eccentric system 330 nevertheless perform the same functions.

[0142] As shown on the figure 13 The actuator 320 is an electric motor comprising a stator 326. The stator 326 includes a frame 374, which comprises a cylindrical wall with a circular base centered on the axis X20 and a mounting plate 373, perpendicular to the axis X20, closing one front end of the cylindrical wall and serving to securely attach the stator 326 to the frame. A rotor 327 is supported by the stator 326 so as to pivot about the axis X20 relative to the stator 326. The rotor 327 is coaxial with the axis X20 and is contained within the stator 326. One front end of the rotor 327 forms an output shaft 328 of the actuator 320, which passes through the mounting plate and extends to the outside. When the actuator 320 is properly powered by the power circuit 21, the output shaft 328 is driven in rotation around the axis X20 by the rotor 327.

[0143] Alternatively, as explained previously, it can be provided that the rotor and the output shaft are separate and not coaxial elements, the rotor driving the output shaft via a reducer, the main axis X20 around which the output shaft rotates being parallel to the axis of rotation of the rotor.

[0144] Preferably, each actuator 320 comprises a resolver (not shown) consisting of a rotor and a resolver stator, according to electrotechnical techniques known to those skilled in the art. The resolver rotor is preferably attached to a hollow support fixed to a rear end of the output shaft 328, such that the clamping screw 393 passes completely through the hollow support and the resolver rotor. The resolver stator is attached to the frame 374 of the stator 326. The measurement of the resolver resulting from the rotation of its rotor within its stator allows the position of the base 31 relative to the frame 20 to be determined. Advantageously, the actuator 320 provides a means for this measurement while preserving the functions of the clamping screw 393.

[0145] Preferably, as with actuator 20, actuator 320 is designed to rotate continuously during weaving, meaning without changing direction. Preferably, actuator 320 is a servomotor, or any other type of electric motor that allows for controlling the orientation of the rotor 327 around the X20 axis. In particular, each actuator 320 includes an encoder and / or a sensor system (not shown) whose measurement determines the orientation of the output shaft 328, according to the same principle as for actuator 20. Each actuator 320 advantageously includes output connectors, which can be connected to a network 22 of the loom 1, such as a measurement bus, to transmit said measurement. The same controllers described above are used to control actuator 320 as for actuator 20.

[0146] The eccentric system 330, better visible on the figure 14 , includes a base 331 and a connecting piece 332.

[0147] As seen on the figure 13 In the present embodiment, the base 331 and the output shaft 328 are formed from a single, one-piece component for compactness. However, it is possible to provide that these two elements are formed from separate parts, fixed to one another.

[0148] The base 331 here forms a discoidal plate perpendicular to the axis X20, formed at one end of the output shaft 328. Along the axis X20, the base 331 is positioned between the actuator plate 373 and the connecting piece 332. The base 331 is directly driven in rotation about the axis X20 by the rotor 327 of the actuator 320, relative to the frame 12. The axis X20 is fixed relative to the frame 12 and relative to the base 331. Via the base 331, the entire eccentric system 330 is driven in rotation by the actuator 320 about the axis X20.

[0149] For this embodiment, the connecting piece 332 is formed by a crankpin, shown individually on the figure 15 The eccentric system further includes a flange 336 fixed to the connecting piece 332, as can be clearly seen in the figures 13 And 14 .

[0150] In this example, the flange 336 is a flat piece, perpendicular to and through which the X20 axis passes. Along the X20 axis, the flange 336 is positioned between the base 331 and the connecting piece 332. In this example, the connecting piece 332 is generally cylindrical with a circular base and is centered on the X41 axis. The X41 and X20 axes are separated by the center-to-center distance of the eccentric R1. The connecting piece 332 protrudes from the flange 336 in a direction opposite to the actuator 320. In this example, the piece 332 is itself made by assembling two parts joined by a screw, but the connecting piece 332 could also be made from a single piece.

[0151] To assemble the connecting piece 332 with the flange 336, it is advantageously provided that the connecting piece 332 includes a finger 375, visible on the figures 13 And 15, coaxial with the X41 axis, projecting from the connecting piece 332 towards the flange 336, and passing through an orifice 376 in the flange 336. The orifice 376, visible on the figures 13 And 14 , is advantageously coaxial with the X41 axis. Furthermore, the fastening of the flange assembly 336 to the connecting piece 332 is, for example, achieved using fastening means such as screws, here three screws 337, parallel to the X41 axis. These screws 337 are symbolized by their center line on the figures 14 And 15 . There figure 14 shows three through-holes belonging to flange 336 and the figure 15 shows three corresponding through holes belonging to the connecting piece 332, through which the screws 337 are received for fixing the flange 336 with the connecting piece 332.

[0152] As shown on the figures 11 And 12The articulated end 41 of the connecting rod 40 is attached to the connecting piece 332, so that the connecting rod 40 and the connecting piece 332 pivot relative to each other about the eccentric axis X41, which is fixed relative to the connecting rod 40 and to the connecting piece 332. The circular flange of the articulated end 41 receives within it the crankpin formed by the connecting piece 332, which is absent from the figure 14 , but visible on the figures 11 à 13 et 15 The connecting piece 332 is pivotally supported within the flange at the end 41, via the bearing 43.

[0153] In this example, to make the distance R1 variable when the adjustment system is in amplitude adjustment mode, the connecting piece 332 is supported by the base 331. It is not only movable in radial translation relative to the base 331, along a translation axis R332, but also movable in rotation relative to the base 331, around the axis X20. The axis R332 is radial relative to the axis X20; that is, it intersects the axis X20 and is perpendicular to it. For any position of the connecting piece 332 relative to the base, the axis R332 intersects both the axis X20 and the axis X41. By moving the connecting piece 332 in translation relative to the base 331 along the axis R332, the distance R1 is varied. Indeed, since the X41 axis is fixed relative to the connecting piece 332 and the X20 axis is fixed relative to the base 331, the relative displacement of these two parts varies the distance R1 which separates these axes X20 and X41.

[0154] To ensure that the connecting piece 332 is both movable relative to the base 331, while also being able to be fixed in rotation and radial translation relative to the base 331, the flange 336 is provided, for example, to include an oblong orifice 377, clearly visible on the figure 14 The eccentric system 330 comprises a rod 378. The oblong orifice 377 passes completely through the flange 336, parallel to the axis X20. The oblong orifice 377 is elongated along the translation axis R332 and extends along this axis R332. The rod 378 is coaxial with the axis X20 and passes through the oblong orifice 377 to support the flange 336 via the oblong orifice 377. The rod 378 supports and guides both the sliding of the oblong orifice 377 along the axis R332 and the pivoting of the oblong orifice about the axis X20.

[0155] Preferably, the rod 378 includes a clamping screw 393 and a clamping nut 394, thus constituting the locking means for the adjustment system to selectively fix and allow variation of the distance R1. The screw 393 and the nut 394 are screwed coaxially with the axis X20. The nut 394 is received in the oblong opening 377, so as to serve as a bearing for the sliding and rotation of the flange 336 when the adjustment system is in the amplitude adjustment configuration. Preferably, by screwing the screw 393 with the nut, the nut bears axially against a peripheral edge of the oblong orifice 377, in the direction of the actuator 320, and a head of the screw 393 bears against the rotor 327, in the opposite direction, to immobilize the connecting piece 332 relative to the base 331 and the rotor by tightening the flange 336 along the axis X20.Thus, to obtain the amplitude adjustment configuration, screw 393 and nut 394 are loosened, allowing translation and rotation of the connecting piece 332 relative to the base 331. To obtain the locked configuration, screw 393 and nut 394 are tightened, which secures the connecting piece 332 to the base 331. Also, flange 336 is secured to the connecting piece 332 and the base 331.

[0156] As seen on the figure 13 It is advantageously provided that the screw 393 extends through the actuator 320, so that a head of the screw 393 emerges at one end of the actuator 320, which is opposite to that carrying the flange 336. The head of the screw 393 is therefore very easily accessible for a person, who has to switch the adjustment system between the adjustment configuration and the locked configuration, by screwing or unscrewing the screw 393 via its head.

[0157] Preferably, the adjustment system includes an amplitude adjustment brake, which here comprises a spring 391, which is, for example, axially interposed between the rotor 327 and the head of the screw 393. Thus, even when the screw 393 and the nut 394 are loosened, the spring applies, by elasticity, an axial force which keeps the flange 336, and therefore the connecting piece 332, slightly axially supported against the base 331, under the action of the nut 394. Thus, the spring 391, combined with the screw 393 and the nut 394, brakes the movement of the connecting piece 332 relative to the base 331 when the adjustment system is in the amplitude adjustment configuration.

[0158] To allow for particularly precise adjustment of the R1 distance, while also enabling adjustment by rotation of the base 331 according to the method described above and illustrated on the figure 17 It is assumed here that the radial translational position of the connecting piece 332 relative to the base 331, along the axis R332, is dependent on the orientation of the connecting piece 332 relative to the base 331 around the principal axis X20. In other words, rotating the piece 332 and the flange 336 relative to the base 331 around the axis X20 results in the radial translation of the piece 332 and the flange 336 relative to the base 331 along the axis R332, and vice versa. Thus, the displacement of the piece 332 and the flange 336 relative to the base 331 occurs along a single trajectory, comprising radial translation and rotation. It is advantageously assumed that, for an initial orientation of the piece 332 relative to the base 331, shown in the figure 11 The radial translation position of part 332 corresponds to a minimum distance R1 between axes X20 and X41. When part 332 is rotated from this initial orientation in the same direction, the radial translation of part 332 occurs in only one direction along axis R332, gradually increasing the distance R1 up to a maximum shown in the diagram. figure 12 When part 332 is rotated from the orientation shown on the figure 12 Conversely, the radial translation of part 332 is also performed in the opposite direction along axis R332, until it gradually returns to the minimum distance R1 shown on the figure 11 .

[0159] To obtain this constraint of the radial translation with the orientation of the part 332 with respect to the base 331, it is provided that the base 331 includes a cam groove 379, and that the connecting part 332 includes a follower finger, here formed by the finger 375, the follower finger 375 being received in the cam groove 379 to be constrained to move along said cam groove 379.

[0160] The cam groove 379 is formed here by a groove, which is formed on the surface of the base 331 and opens towards the connecting piece 332. The cam groove 379 has a spiral shape. In other words, the cam groove 379 describes, along the surface of the base 331, a spiral path that bypasses the X20 axis, as clearly visible on the figures 11 , 12 And 14 .

[0161] As shown on the figure 13The finger 375 projects axially from the flange 336 towards the base 331, so that its end is received in the cam groove 379. In practice, the finger 375 passes through the orifice 376 and through the flange 336, extending beyond the flange 336 to the groove 379. Once received in the groove 379, the finger 375 is guided to slide along said groove 379 and is thus constrained to remain on the path it describes. Here, the axis X41 follows the same path as the finger 375, being coaxial with it. Since the finger 375 cooperates with the groove 379 to move along a single path, the radial translation and pivoting of the connecting piece 332 are completely constrained. The orifice 376 constitutes means for positioning the follower finger 375 in the cam groove 379.

[0162] Alternatively, it can be provided that the follower finger 375 is a single piece with the flange 336.

[0163] The groove 379 includes ends 339, which, together with the finger 375, form amplitude adjustment stops belonging to the adjustment system, in that the ends 339 limit the displacement of the finger 375 along the groove, as shown respectively in figures 11 And 12 It follows that the radial translation of the connecting piece 332 is limited between one position, that of the figure 11 , where the value of the distance R1 is minimal, and a position, that of the figure 12 , where the value of the distance R1 is maximum.

[0164] More generally, to achieve the amplitude adjustment configuration, the connecting piece 332 is designed to move along a predetermined path relative to the base 331, through the interaction of a cam groove and a cam follower mounted on these pieces, to vary the center distance R1. Here, the locking means, consisting of the flange 336, the clamping screw 393, and the clamping nut 394, fix the position of the connecting piece 332 relative to the base 331, along the cam groove 379, to obtain the locked configuration. However, an alternative locking means could be used to fix the position of the connecting piece 332 relative to the base 331. Depending on the solution chosen, the rotation of the piece 332 is not necessarily constrained by radial translation.

[0165] There figure 16 shows an actuator 420 and an eccentric system 430 for a fourth embodiment, with a loom identical to loom 1 of the figures 1 à 7 except specifically for actuator 420 and eccentric system 430, which replace actuator 20 and eccentric system 30. Actuator 420 and eccentric system 430 nevertheless perform the same functions.

[0166] Actuator 420 is identical to actuator 320, and eccentric system 430 is identical to eccentric system 330 except for the differences mentioned below. Identical components are shown on the... figure 16 with the same reference symbols as for actuator 320.

[0167] For the eccentric system 430, the follower finger 375 is replaced by another follower finger 475, identical to the follower finger 375 except for the differences described below. For the eccentric system 430, the cam groove 379 is replaced by another cam groove 479, identical to the cam groove 379 except for the differences described below.

[0168] Preferably, the follower finger is a nut 489 having a head, which is radially projecting with respect to the axis X40, and which is received in the cam groove 479, which has rims axially capturing the head of the nut 489. In other words, the cam groove 479 has a T-shaped cross section complementary to the head of the nut 489.

[0169] Preferably, for this embodiment, the rod 378 provides the function of a locking means without providing the function of a braking means, while the follower finger 475 and a spring 491, described below, provide the function of a braking means without providing the function of a locking means.

[0170] Preferably, the spring 491 is, for example, axially interposed between the connecting piece 332 and the nut 489. Here, the spring 491 consists of a spring washer located in a groove in the nut 489. Thus, even when the rod 378 and the nut 394 are loosened, the spring applies, by elasticity, an axial force that keeps the connecting piece 332 slightly axially supported against the base 331, under the action of the nut 489 cooperating with the edges of the cam groove 479. Therefore, the spring 491, combined with the nut 489, dampens the movement of the connecting piece 332 relative to the base 331 when the adjustment system is in its amplitude adjustment configuration. If the braking is provided by the spring 491, the spring 391 is advantageously unnecessary.

[0171] It can also be provided that the elastic washer 491 is positioned under a screw head and not in a groove of the nut 489 and that the tightening of this screw relative to the nut 489 serves to adjust the intensity of the braking of the washer, that is to say the most suitable braking torque to maintain the relative position between the connecting piece 332 and the base 331.

[0172] In an alternative configuration not shown, the follower finger 475 can be configured to perform both locking and braking functions. In this case, the follower finger 475 is in two parts. The follower finger 475 comprises the nut 489 and a clamping screw (not shown), the location of which is indicated by reference numeral 488. The clamping screw is screwed into the nut 489 coaxially with the X40 shaft. The clamping screw then has a head that is accessible from an axial face of the connecting piece 332 for tightening and bears against the connecting piece 332. Tightening the clamping screw with the nut 489 places the head of the clamping screw axially against the connecting piece 332 and the head of the nut axially against the edges of the cam groove 479, thus preventing the connecting piece 332 from moving relative to the base 331 by locking. This variant does not require the use of the rod 378 for locking.If the locking mechanism is provided by the follower finger 475 as described above, the screw 393 and nut 394 of the rod 378 do not serve as a locking mechanism for the amplitude adjustment system. During weaving and adjustment, the screw 393 and nut 394 are loosened to always allow movement of the flange 336 and the connecting piece 332 relative to the base 331, through the interaction of the rod 378 with the oblong opening 377. In this case, a cover 499 is advantageously provided to prevent access to the head of the screw of the rod 378 by a person.

[0173] In this variant, in the amplitude adjustment configuration, the clamping screw and nut 489 are loosened, allowing the follower finger 475 to move within the cam groove 479, thus permitting adjustment of the center distance R1, similarly to the follower finger 375. In the locked configuration, the clamping screw and nut 489 are tightened, securing the connecting piece 332 to the base 331. The follower finger 475 therefore serves as the locking mechanism for the amplitude adjustment system.

[0174] For this variant, it can be predicted that the actuator 420 includes a resolver through which the clamping screw 393 passes.

Claims

1. A shedding machine (2) for operating a heald frame (11) of a loom (1; 101) according to a reciprocating stroke (C11) along a frame axis (Z11), the shedding machine (2) comprising: - a rotary electric actuator (20; 320); - a controller (23) adapted to control the rotary electric actuator (20; 320) - an eccentric system (30; 230; 330), which comprises: ◆ a base (31; 231; 331) by means of which the eccentric system (30; 230; 330) is driven in rotation, by the rotary electric actuator (20; 320), about a main axis (X20) perpendicular to the frame axis (Z11), and ◆ a connecting piece (32; 232; 332) defining an eccentric axis (X41), which is parallel to the main axis (X20); - a lever (50), which is pivoted in an oscillating way about a lever axis (X50) to actuate said heald frame (11), the lever axis (X50) and the main axis (X20) being parallel; and - a transmission rod (40), which comprises: ◆ a first articulation end (41), by means of which the transmission rod (40) is coupled to the connecting piece (32; 232; 332) such that the eccentric system (30; 230; 330) and the transmission rod (40) are pivotable relative to each other about the eccentric axis (X41), the eccentric axis (X41) and the main axis (X20) being spaced apart by an eccentric center distance (R1), and ◆ a second articulation end (42), by means of which the transmission rod (40) is coupled to the lever (50), so that the lever (50) and the transmission rod (40) are pivotable relative to each other about a transmission rod axis (X42), which is parallel to the main axis (X20), the transmission rod axis (X42) and the eccentric axis (X41) being spaced apart by a transmission rod center distance (R2), - an adjustment system, which comprises locking means (93, 98; 293, 98; 393, 394, 98) and which allows: ◆ preferably, an amplitude adjustment configuration, in which the locking means (93, 98; 293, 98; 393, 394, 98) allow a movement of the connecting piece (32; 232; 332) relative to the base (31; 231; 331) such that the eccentric center distance (R1) is adjustable; characterized in that the adjustment system enables: - a height adjustment configuration, wherein the locking means (93, 98; 293, 98; 393, 394, 98) allow movement of the second articulation end (42) relative to the first articulation end (41) such that the transmission rod center distance (R2) is adjustable; and - a locked configuration, in which the eccentric center distance (R1) and the transmission rod center distance (R2) are fixed, in that the locking means (93, 98; 293, 98; 393, 394, 98) are configured so that the connecting piece (32; 232; 332) is fixedly secured to the base (31; 231; 331) and the first articulation end (41) is fixedly secured to the second articulation end (42); and and in that the shedding machine (2) comprises a locking system (80; 180), which allows for a locked configuration, where the locking system (80; 180) locks the orientation of the lever (50), when the lever (50) is in a reference orientation, and a release configuration, where the locking system (80; 180) allows pivoting of the lever (50).

2. The shedding machine (2) according to claim 1, wherein the locking system (80) comprises a stop (81, 82; 181), which, in order to lock the pivoting of the lever (50), cooperates mechanically with the lever (50), and, in order to allow the pivoting of the lever (50), is released from the lever (50).

3. The shedding machine (2) according to any one 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 connecting piece (32; 232) and the base (31; 231) are pivotable relative to each other about a crank axis (X32; X232), which is fixed relative to the base (31; 231) and relative to the connecting piece (32; 232), and which is parallel to the main axis (X20).

4. The shedding machine (2) according to claim 3, wherein: - the connecting piece (32) comprises a crankpin (95), coaxial with the crank axis (X32), and the base (31) comprises a pinch ring (94) receiving the crankpin (95), the base (31) carrying the connecting piece (32) by means of the crankpin (95) received in the pinch ring (94), or - the base (231) comprises a crankpin (295), coaxial with the crank axis (X232), and the connecting piece (232) comprises a pinch ring (294) receiving the crankpin (295), the base (231) carrying the connecting piece (232) by means of the crankpin (295) received in the pinch ring (294).

5. The shedding machine (2) according to claim 4, wherein the locking means (93, 98; 293, 98) comprises a clamping screw (93; 293), which: - in the locked configuration of the adjustment system, is in a clamping position of the pinch ring (94; 294) about the crankpin (95; 295), to secure the connecting piece (32; 232) to the base (31; 231), and - in the amplitude adjustment configuration of the adjustment system, is in a position of loosening the pinch ring (94; 294) about the crankpin (95; 295), to allow the pivoting of the connecting piece (32; 232) relative to the base (31; 231), by pivoting the crankpin (95; 295) in the pinch ring (94; 294).

6. The shedding machine (2) according to any one of claims 1 or 2, wherein the base (331) comprises a cam groove (379) defining a spiral about the main axis (X20), and the connecting piece (332) comprises a finger follower (375), which travels along the cam groove (379) to guide the connecting piece (332) relative to the base (331), when the adjustment system is in an amplitude adjustment configuration and thus varies the eccentric center distance (R1), wherein the eccentric system (330) comprises: - a flange (336), which extends perpendicular to the main axis (X20), which comprises: ◆ means for positioning (376) the finger follower (375) in the cam groove (379), and ◆ an elongated oblong opening (377) along a translation axis (R332); and - a rod (378), which is coaxial with the main axis (X20) and is received in the oblong opening (377) to support the flange (336) by means of the oblong opening (377), and wherein: - the locking means (393, 394, 98) comprises a clamping screw (393) and a clamping nut (394), which form the rod (378), the clamping screw (393) and the clamping nut (394) being mutually screwed along the main axis (X20); - in the locked configuration of the adjustment system, the flange (336) is fixedly secured with the base (331), being axially clamped against the base (331), by screwing the clamping screw (393) into the clamping nut (394), to immobilize the connecting piece (332) along the spiral path relative to the base (331) and thus fix the eccentric center distance (R1); and - in the amplitude adjustment configuration, movement of the connecting piece (332) relative to the base (331) is allowed, by loosening the clamping screw (393) of the clamping nut (394).

7. The shedding machine (2) according to any one of the preceding claims, wherein the transmission rod (40) comprises a first transmission rod end (44), carrying the first articulation end (41), and a second transmission rod end (45), carrying the second articulation end (42), the first transmission rod end (44) and the second transmission rod end (45) being slidably inserted relative to each other along a sliding axis (R40) such that the connecting rod center distance (R2) is adjustable.

8. The shedding machine (2) according to any one of the preceding claims, wherein the adjustment system comprises adjustment stops, among: - amplitude adjustment stops (38, 39; 238, 239; 339, 375), limiting the movement of the connecting piece (32; 232; 332) to limit the variation of the eccentric center distance (R1) between a predetermined minimum eccentric center distance value (6B) and a maximum eccentric center distance value (6C), in the case where the adjustment system can be put into the amplitude adjustment configuration; and - height adjustment stops (46, 47), limiting the movement of the second articulation end (42) to limit the variation of the connecting rod center distance (R2) between a predetermined minimum connecting rod center distance value (7B) and a predetermined maximum connecting rod center distance value (7C), in case the adjustment system may be put into the height adjustment configuration.

9. The shedding machine (2) according to any one of the preceding claims, wherein the adjustment system comprises at least one brake, among: - an amplitude adjustment brake (91; 391), configured to maintain the position of the connecting piece (32; 232; 332) relative to the base (31; 231; 331) below the application of a determined relative displacement force while the adjustment system is in an amplitude adjustment configuration; and - a height adjustment brake (92), configured to maintain the position of the second articulation end (42) relative to the first articulation end (41) below the application of a predetermined relative displacement force while the adjustment system is in a height adjustment configuration.

10. The shedding machine (2) according to any one of the preceding claims, wherein the controller (23) is able to control the rotary electric actuator (20) to vary the eccentric center distance (R1) in the amplitude adjustment configuration or to vary the connecting rod center distance (R1) in the height adjustment configuration.

11. A loom (1; 101), comprising the shedding machine (2) according to any one of the preceding claims, and the heald frame (11) operated by the shedding machine (2).

12. An adjusting method, for adjusting the shedding machine (2) according to any one of the preceding claims, the adjusting method comprising successively: - a step (a) of pivoting the lever (50) to the reference orientation, by rotating the eccentric system (30; 230; 330) while the adjustment system is in the locked configuration and the locking system is in the release configuration; - a step (b) of putting the locking system in the locking configuration; - a step (c) of putting the adjustment system in the adjustment configuration; - preferably, in the case that the adjustment system is in the amplitude adjustment configuration, a step (d1) of adjusting the eccentric center distance (R1) by rotating the eccentric system (30; 230; 330) by a predetermined value; and - in the case that the adjustment system is in the height adjustment configuration, a step (d2) of adjusting the connecting rod center distance (R2) by rotating the eccentric system (30; 230; 330) by a predetermined value.

13. The adjusting method according to claim 12, wherein, for the step (d1, d2) of adjusting, the rotating of the eccentric system (30; 230; 330) is performed by a rotational control of the rotary electric actuator (20; 320) according to a target value or incremental value relative to a desired frame stroke or a desired frame height.

14. The adjusting method according to any one of claims 12 or 13, wherein the shedding machine (2) according to claim 8, and the adjusting method comprises a prechecking step, performed after the step (c) of putting the adjustment system to the adjustment configuration and before the step (d1, d2) of adjusting, the prechecking step comprising: - a step (c2) of requesting a rotation of the rotary electric actuator (20; 320) in a first direction of rotation until an adjustment stop (38, 39; 238, 239; 339, 375, 46, 47) is reached; - a step (c3) of measuring a first rotation angle described by the eccentric system (30; 230; 330) having reached the adjustment stop (38, 39; 238, 239; 339, 375, 46, 47) - a step (c4) of comparing the measured first rotation angle with a predetermined first angle corresponding to the rotation expected from the position of the adjustment stop (38, 39; 238, 239; 339, 375, 46, 47) to establish whether the shedding machine (2) is in a nominal situation or in a fault situation, such as a loosening fault or an adjustment fault; and - a step (c5) of issuing an alarm, in the case where it has been established that the shedding machine (2) is in the fault situation.

15. The adjusting method according to any one of claims 12 to 14, wherein, after the step of adjusting (d1, d2), the adjusting method comprises, successively: - a step (e) of putting the adjustment system in a locked configuration; and - a step (f) of putting the locking system in a release configuration.

16. The adjusting method according to any one of claims 12 to 15, wherein the adjusting method comprises a locking check step between the step (b) of putting the locking system in the locked configuration and the step (c) of putting the adjustment system in the adjustment configuration, which comprises: - a step (b1) of checking that the rotary actuator does not rotate under the application of a predetermined torque value, and - a step (b2) of issuing an alarm signaling a locking fault in case a rotational movement of the rotary electric actuator (20; 320) is detected; wherein the adjusting method preferably comprises a locking check step, between the step (e) of putting in locked configuration and the step (f) of putting in release configuration, which comprises: - a step (e1) of checking that the rotary electric actuator does not rotate under the application of a predetermined torque value, and - a step (e2) of issuing an alarm signaling a locking failure in case a rotational movement of the rotary electric actuator (20; 320) is detected.

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