Shedding machine for a loom and method of adjusting the same

Abstract

Shed forming machine (2), comprising: an eccentric system (30) rotatable about a main axis (X20); a lever (50); and a connecting rod (40), coupled to the eccentric system and to the lever in a pivoting manner about eccentric (X41) and connecting rod (X42) axes spaced apart by a connecting rod center distance (R2), the main axis (X20) and the eccentric axis (X41) being spaced apart by an eccentric center distance (R1). To facilitate the adjustment of the stroke of a heald frame actuated by the machine, it comprises 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) comprises a locking system (80), which allows lever locking and lever release configurations.

Description

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

[0002] The invention relates to the technical field of frame-connecting rod actuator type shedding forming machines for a heddle frame loom.

[0003] It is known to use a plurality of electric actuators on the frame to drive vertical oscillations of the heddle frames. Depending on the technology used, the electric actuators produce an oscillating rotation or a continuous rotation. In both cases, each electric actuator drives the corresponding heddle frame via a pulling mechanism, comprising a crank pin, connecting rods and levers, which transform the rotation produced by the actuator into an alternating translation of the heddle frame. During use of the loom, in particular for an article change, it may be necessary to adjust the amplitude and height of the stroke of the heddle frame. Changing the amplitude amounts to changing the opening angle of the warp thread shed. Changing the height amounts to changing the height of the crossing of the warp thread plies.

[0004] EP14989208A1 describes a shedding device including an electric actuator with oscillating rotation. In this case, the amplitude and height of the stroke of the heald frame depend on the oscillation stroke of the actuator. However, the implementation of an oscillating actuator, rather than a continuously rotating actuator, involves strong design constraints, which would make it difficult to obtain a high adjustment range, or which limit the maximum load and speed that the actuator can provide.

[0005] FR2977592A1 and FR2734610A1 each describe a shedding device, where a lever for actuating heald frames is connected to the connecting rod-crank system by means of an adapter or a stirrup, the position of which is manually adjustable, along an arm belonging to the lever and which can be immobilized using a clamping screw. However, manual adjustment of this type of system can be tedious and difficult to achieve accurately.

[0006] DE102008032718B3 describes a shedding device where the eccentricity of an eccentric device is adjustable, by moving an eccentric connecting rod drive disc, relative to a connecting element, which is itself rotated by the actuator. The adjustment is carried out manually using an adjustment rod. A disadvantage of this type of adjustment is that the adjustable parts can be difficult to access, that a high number of screwing or unscrewing steps are necessary for the adjustment, and that a high level of skill is required to carry out the adjustment.

[0007] The invention aims to remedy the drawbacks of the prior art by proposing a new shed forming machine where the adjustment of the alternative translational stroke of the heald frame is facilitated.

[0008] The invention relates to a shedding machine for actuating a heddle frame of a loom in an alternating translational stroke, along a frame axis. The shedding machine comprises: a rotary electric actuator; a controller capable of controlling the rotary electric actuator; an eccentric system, which comprises: a base through which the eccentric system is rotated, by the rotary electric actuator, about a main axis perpendicular to the frame axis, and a connecting piece defining an eccentric axis, which is parallel to the main axis; a lever, which is pivotable in oscillation about a lever axis to actuate said heddle frame, the lever axis and the main axis being parallel;and a connecting rod, which comprises: a first hinge end, via which the connecting rod is coupled to the connecting piece so that the eccentric system and the connecting rod are pivotable relative to each other about the eccentric axis, the eccentric axis and the main axis being spaced apart by an eccentric center distance, and a second hinge end, via which the connecting rod is coupled to the lever, so that the lever and the connecting rod are pivotable 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 spaced apart by a connecting rod center distance.;

[0009] According to the invention, the shedding machine comprises: an adjustment system, which comprises locking means and which allows: at least one adjustment configuration, among: an amplitude adjustment configuration, in which the locking means allow a movement of the connecting piece relative to the base so that the eccentric center distance is adjustable, and a height adjustment configuration, in which the locking means allow a movement of the second articulation end relative to the first articulation end so that the connecting rod center distance is adjustable;and 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 secured to the base and so that the first articulation end is secured 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.;

[0010] An idea underlying the invention is to provide that, when the shed forming machine is in the adjustment configuration and the locking system is in the locking configuration, a rotation of the eccentric system modifies the adjustment of the alternative translational stroke of the heald frame, since the lever is locked in the reference orientation by the locking system. In particular, in the case where the adjustment system is in the amplitude adjustment configuration, the connecting rod center distance is fixed, so that a modification of the orientation of the base of the eccentric system around the main axis corresponds to a modification of the eccentric center distance when the lever is locked.In the case where the adjustment system is in the height adjustment configuration, the eccentric center distance is fixed, so that a modification of the orientation of the eccentric system around the main axis corresponds to a modification of the value of the connecting rod center distance when the lever is locked. Advantageously, the rotation of the eccentric system can be carried out by the rotary electric actuator, such that in the adjustment configuration, the adjustment can be carried out by having the rotary electric actuator execute an instruction to rotate the eccentric system, whether this instruction is transmitted on the order of a person, or on the order of an automatic adjustment program.Once the lever has been locked in the reference orientation and the adjustment system has been put into the adjustment configuration, it is advantageously not necessary to manually move parts of the shed forming machine to carry out the adjustment, which reduces the risk of error, makes the adjustment less tedious and allows for particularly precise adjustment. Alternatively, the rotation of the eccentric system can be carried out manually to carry out the adjustment.

[0011] The invention applies to the case where the machine has an amplitude adjustment configuration, to the case where the machine has a height adjustment configuration, and to the case where the machine has both an amplitude adjustment configuration and a height adjustment configuration. The invention applies to a shedding machine which comprises a shedding height adjustment system, or a shedding amplitude adjustment system, or both.

[0012] Preferably, the locking system comprises a stop, which, to block the pivoting of the lever, cooperates mechanically with the lever, and, to allow the pivoting of the lever, is released from the lever.

[0013] Preferably, in order for the eccentric center distance to be adjustable when the adjustment system is in the amplitude adjustment configuration, the connecting piece and the base are pivotable relative to each other about a crank axis, which is fixed relative to the base and relative to the connecting piece, and which is parallel to the main axis.

[0014] Preferably, the connecting piece comprises a crank pin, coaxial with the crank shaft, and the base comprises a pinch ring receiving the crank pin, the base carrying the connecting piece via the crank pin received in the pinch ring.

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

[0016] Preferably, the locking means comprise a clamping screw, which: in the locked configuration of the adjustment system, is in a position for tightening the pinch ring around the crank pin, to secure the connecting part to the base, and in the amplitude adjustment configuration of the adjustment system, is in a position for loosening the pinch ring around the crank pin, to allow the pivoting of the connecting part relative to the base, by pivoting the crank pin in the pinch ring.

[0017] Preferably, the base comprises a cam groove defining a spiral around the main axis, and the connecting piece comprises a follower finger, which circulates along the cam groove to guide the connecting piece relative to the base, when the adjustment system is in the amplitude adjustment configuration and thus vary the eccentric center distance.

[0018] Preferably, the eccentric system comprises: a flange, which extends perpendicular to the main axis, which comprises means for positioning the follower finger in the cam groove, and an oblong orifice elongated along a translation axis; 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.

[0019] 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 integral with the base, being axially tightened against the base, by screwing the clamping screw into the clamping nut, to immobilize the connecting piece along the spiral trajectory relative to the base and thus fix the eccentric center distance. Preferably, in the amplitude adjustment configuration, the movement of the connecting piece relative to the base is allowed, by loosening the clamping screw of the clamping nut.

[0020] 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 slidably fitted relative to each other along a sliding axis, so that the connecting rod center distance is adjustable.

[0021] Preferably, the adjustment system comprises adjustment stops, among: amplitude adjustment stops, limiting the movement 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 into the amplitude adjustment configuration; and height adjustment stops, limiting the movement of the second articulation end 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 into the height adjustment configuration.

[0022] Preferably, the adjustment system comprises at least one brake, among: an amplitude adjustment brake, configured to maintain the position of the connecting part relative to the base below the application of a determined relative displacement force while the adjustment system is in the amplitude adjustment configuration; and a height adjustment brake, configured to maintain the position of the second articulation end relative to the first articulation end below the application of a determined relative displacement force while the adjustment system is in the height adjustment configuration.

[0023] Preferably, the adjustment system comprises at least one set of graduations, among: a set of amplitude adjustment graduations, indicating an amplitude adjustment value depending on the eccentric center distance; and a set of height adjustment graduations, indicating an amplitude adjustment value depending on the connecting rod center distance.

[0024] Preferably, the controller is adapted to control 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.

[0025] The invention also relates to a weaving loom, comprising the shed forming machine as defined above, and the heddle frame operated by the shed forming machine.

[0026] The invention also relates to an adjustment method for adjusting the shedding machine as defined above.The adjustment method successively comprises: 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 blocking system is in the release configuration; a step of placing the blocking system in the blocking configuration; a step of placing the adjustment system in the adjustment configuration; and, 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.

[0027] Preferably, for the adjustment step, the rotational drive of the eccentric system is achieved by a rotational control of the rotary electric actuator.

[0028] Preferably, the rotary electric actuator is controlled in rotation according to a target value or incremental value setpoint relative to a desired frame stroke or a desired frame height.

[0029] Preferably, the adjustment method comprises a pre-checking step, carried out after the step of putting the adjustment system into the adjustment configuration and before the adjustment step, the pre-checking step comprising: a step of controlling the rotation of the rotary electric actuator in a first direction of rotation until reaching an adjustment stop; a step of measuring a first rotation angle described by the eccentric system having reached the adjustment stop; a step of comparing the first measured rotation angle with a first predetermined angle corresponding to the rotation predictable according to the position of the adjustment stop to establish whether the shedding 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 case where it has been established that the shedding machine is in the fault situation.

[0030] Preferably, the preliminary check comprises, before the step of transmitting the first instruction: a step of controlling rotation by the rotary electric actuator in a direction of rotation, opposite to the first direction of rotation, until reaching an adjustment stop; a step of measuring a second angle of rotation described by the eccentric system having reached the adjustment stop; and a step of comparing the second measured angle of rotation with a second predetermined angle corresponding to the rotation predictable according to 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 an adjustment fault.

[0031] Preferably, after the adjustment step, the adjustment method comprises, successively: a step of placing the adjustment system in the locked configuration; and a step of placing the blocking system in the release configuration.

[0032] Preferably, the adjustment method comprises a blocking control step between the step of placing the blocking system in the blocking configuration and the step of placing the adjustment system in the adjustment configuration, which comprises: a step of verifying 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.

[0033] Preferably, the adjustment method comprises a locking control step, between the step of placing in locked configuration and the step of placing in release configuration, which comprises: a step of verifying 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.

[0034] Preferably, the adjustment method comprises cutting off an electrical power supply to the rotary electric actuator during the adjustment configuration step.

[0035] The invention and other advantages thereof will appear more clearly in light of the following description of embodiments in accordance with 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 shedding 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 steps in 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 shedding 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 shedding 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 shedding machine according to a fourth embodiment, showing in particular 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 of the figures 11 And 12 . [ FIG 14 ] There figure 14 is a perspective view of part of the crowd forming machine figures 11 à 13 . [ FIG 15 ] There figure 15 is a perspective view of another part of the crowd forming machine figures 11 à 14 . [ FIG 16 ] There figure 16 is a section of a shedding 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.

[0036] There figure 1 shows a first embodiment, including a loom 1 with heddle frames 11, a frame 12 and shed forming machines 2 for operating the heddle frames 11. On the figure 1 , the frames 11 are represented on a reduced scale with respect to the machines 2.

[0037] Here, four heald frames 11 and four machines 2 are provided, each machine 2 respectively operating one of the frames 11.

[0038] 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 heald frames 11.

[0039] Each frame 11 advantageously comprises an upper crosspiece 13, a lower crosspiece 14, parallel to the crosspiece 13 and two uprights 15 and 16, parallel to each other and connecting the crosspieces 13 and 14. Preferably, the crosspieces 13 and 14 are horizontal while the uprights 15 and 16 are vertical. Each heald frame 11 is equipped with a row of healds, not shown, each connecting the crosspieces 13 and 14 and being arranged between the uprights 15 and 16, being distributed along the crosspieces 13 and 14. The healds each carry an eyelet crossed by a warp thread, the warp threads forming a sheet of warp threads. The weaving loom 1 advantageously includes other components, such as a beater, means for inserting a weft thread, which are not shown.

[0040] For the purpose of carrying out weaving, each machine 2 is designed to actuate the corresponding heddle frame 11 according to an alternative translational stroke C11, relative to the frame 12, along a frame axis Z11 specific to this frame 11. By "stroke", reference is made to the trajectory 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 the machine 2 along the stroke C11, the frame 11 is moved parallel to the axis Z11, in a rectilinear movement, going back and forth between an upper extreme position H11, corresponding to an upper limit of the stroke C11, and a lower extreme position B11, corresponding to a lower limit of the stroke C11. The axis Z11, and therefore the movement of the frame 11, is preferably vertical, or at least parallel to the rails of the frame 11 in question.

[0041] During weaving, for the insertion of each weft thread, the position of the frames 11 along their respective stroke C11 is determined under the action of the machines 2, independently for each frame 11, to define the shed of the loom receiving the inserted weft thread. The loom 1 then produces a fabric of warp threads and weft threads with a desired weave.

[0042] Each shedding machine 2 comprises a rotary electric actuator 20, and a pulling mechanism comprising an eccentric system 30, a connecting rod 40, called a “transmission connecting rod”, a lever 50 and, preferably, a connecting rod 60, a lever 70, a connecting rod 17 and a connecting rod 18. The weaving loom 1 comprises a blocking system 80, which is shared between the machines 2.

[0043] For each machine 2, each frame 11 is actuated by said machine 2 by being actuated by the electric actuator 20 of this machine 2, via the pulling mechanism of this machine 2, connecting the actuator 20 to the frame 11.

[0044] 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.

[0045] In the present example, the stator 26 includes a frame, which comprises a cylindrical wall with a circular base centered on an axis X20, called the “main axis”, and a fixing plate 73 perpendicular to the axis X20, closing a front end of the cylindrical wall and serving to fix the stator 26 on the frame 12. The rotor, not visible in the figures, is supported by the stator 26, so as to be pivotable around the axis X20 relative to the stator 26. The rotor is coaxial with the axis X20 and is contained in the stator 26. The output shaft 28 is here directly formed at a front end of the rotor and passes through the fixing plate to open to the outside. When the actuator 20 is appropriately electrically powered by a power circuit 21 belonging to the loom 1, the output shaft 28 is driven in rotation in a driving manner around the axis X20 by the rotor.In other words, to electrically power the rotor and / or the stator 26 and control the actuator 20, the actuator 20 is electrically connected to the power circuit 21.

[0046] Alternatively, it may be provided that the rotor and the output shaft are 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.

[0047] For each actuator 20, the axis X20 is perpendicular to the axis Z11. For each actuator 20, the main axis X20 is advantageously perpendicular to a plane defined by the stringer frame 11. The frames 11 are distributed parallel to the axis X20 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 axis X20, so that their output shaft 28 is located 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 hinder each other in their movements.

[0048] Concerning 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.

[0049] Preferably, during weaving, the actuator 20 performs a continuous rotation, that is to say a rotation without changing direction, and not an oscillating rotation.

[0050] As shown on the figure 1 , for each pulling mechanism, the lever 50 is pivoted 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 linked to the frame 11 to be actuated, by means of the connecting rod 17. For this, the connecting rod 17 is coupled to a radial arm 51, here approximately horizontal, belonging to the lever 50, by an articulation end allowing a pivoting of the connecting rod 17 relative to the lever 50 around an axis parallel to the axis X50, and is coupled to the frame 11, by an articulation end allowing a pivoting of the connecting rod 17 relative to the frame 11 around an axis parallel to 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 crosspiece 14.The two articulations of the connecting rod 17 are approximately parallel to the axis Z11. By means of the connecting rod 17, the oscillating pivoting of the lever 50 actuates and determines the alternative translation of the frame 11 along the stroke C11.

[0051] At any time, 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 pivoting in oscillation, the lever 50 pivots in a first direction to a maximum orientation, where the frame 11 is in the upper extreme position H11, then in a second opposite direction, to a minimum orientation, where the frame 11 is in the lower extreme position B11. By passing from the maximum orientation to the minimum orientation and vice versa, the lever 50 makes the frame 11 travel the entire stroke C11.

[0052] Likewise, if provided, the lever 70 is pivotable 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 linked to the frame 11 to be actuated, by means of the connecting rod 18. For this, the connecting rod 18 is coupled to a radial arm 71, here approximately horizontal, belonging to the lever 70, by an articulation end allowing the connecting rod 18 to pivot relative to the lever 70 around an axis parallel to the axis X70, and is coupled to the frame 11, by an articulation 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 crosspiece 14.The two articulations of the connecting rod 18 are approximately parallel to the axis Z11. The connecting rods 17 and 18 are advantageously parallel. By means of the connecting rod 18, the oscillating pivoting of the lever 70 actuates and determines the alternative translation of the frame 11 along the stroke C11.

[0053] The levers 50 and 70 are synchronized in their oscillating pivoting, so as to be in the same orientation relative to the frame 12, around their respective axes X50 and X70. For this, as shown in the figure 1 , the connecting rod 60 is coupled to a radial arm 52 of the lever 50, here a vertical arm, by an articulation end allowing the connecting rod 60 to pivot relative to the lever 50 around an axis parallel to the axis X50, and to a radial arm 72, here a vertical arm, of the lever 70, by an articulation end allowing the connecting rod to pivot relative to the lever 70 around an axis parallel to the axis X70. The connecting rod 60 is approximately parallel to the crosspieces 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 alternating translation by the two levers 50 and 70 at the same time, via the connecting rods 17 and 18.

[0054] The eccentric system 30 comprises a base 31 and a connecting piece 32.

[0055] Along the axis X20, the base 31 is preferably arranged between the actuator 20 and the connecting piece 32. The base 31 is fixed on the output shaft 28 of the actuator 20, so as to be directly driven in rotation around the axis X20 by the actuator 20, relative to the frame 12. The axis X20 is fixed relative to the frame 12 and relative to the base 31. The orientation of the output shaft 28 around the axis X20 corresponds to that of the base 31. Via the base 31, the eccentric system 30 as a whole is driven in rotation by the actuator 20 around the axis X20. Conversely, the rotational drive of the eccentric system 30 around the axis X20 drives the rotor in rotation around the axis X20.

[0056] The lever 50 is driven according to the oscillating pivoting, that is to say, with change of direction, by the continuous rotation of the eccentric system 30, that is to say, without change of direction, by means of the connecting rod 40. The connecting rod 40 converts the continuous rotation of the eccentric system 30 into oscillating pivoting of the lever 50. For this, the connecting rod 40 comprises, at a first end, an articulation end 41, and, at a second end, an articulation end 42.

[0057] The connecting rod 40 is coupled to the connecting piece 32 of the eccentric system 30, via the articulation end 41. Via this articulation end 41, the connecting rod 40 and the connecting piece 32 are pivotable relative to each other about an axis X41, called the “eccentric axis”. The axis X41 is fixed relative to the connecting rod 40 and relative to the connecting piece 32 and is parallel to the axis X20. The axes X41 and X20 are spaced apart from each other by a distance R1, which is a distance measuring the center distance between the axes X41 and X20. This distance R1 is called the “eccentric center distance”. When the eccentric system 30 rotates around the X20 axis, the X41 axis rotates around the X20 axis.

[0058] In the present example, the articulation end 41 comprises a circular flange centered on the axis X41 and which receives within it a crank pin 35 belonging to the connecting piece 32, the crank pin 35 being pivotally supported within the flange, 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 coupled to the arm 52 of the lever 50. Alternatively, the connecting rod 40 is attached to another arm of the lever 50, which is distinct from the arms 51 and 52. In any event, by means of this articulation end 41, the connecting rod 40 and the lever 50 are pivotable relative to each other around an axis X42, called the “connecting rod axis”. The axis X42 is fixed relative to the connecting rod 40 and relative to the lever 50. The axes X42 and X50 are parallel and spaced apart from each other, so that the arm 52 to which the articulation end 42 is connected serves as a lever arm for the actuation of the lever 50 by the connecting rod 40. When the connecting rod 40 is driven by the eccentric system 30, the axis X42 rotates about the axis X50. The axis X42 is also parallel and spaced apart from the axis X20.The axes X41 and X42 are parallel and separated from each other by a distance R2, which is a distance measuring the center distance between the axes X41 and X42. This distance R2 is 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 crossed by an orifice coaxially with the axis X42, within which is received a rivet, not shown, to couple the lever 50 and the connecting rod 40 while allowing their relative pivoting.

[0061] Each shed forming machine 2 comprises an adjustment system, which allows a locked configuration and one or more adjustment configurations. In the locked configuration, the center distances R1 and R2 are fixed. To carry out weaving, it is ensured that the adjustment system is in the locked configuration. In the locked configuration of the adjustment system and in weaving operation of the loom, the center distances R1 and R2 cannot be modified. For each adjustment configuration, one of the center distances R1 and R2 is variable so that it can be adjusted, while the other center distance R1 or R2 is fixed.Here, the adjustment system makes it possible to alternately move between the locked configuration, an amplitude adjustment configuration where the eccentric center distance R1 is variable while the connecting rod center distance R2 is fixed, and a height adjustment configuration where the distance R2 is variable while the distance R1 is fixed. Alternatively, it could be provided that the adjustment system moves only between the locked configuration and only one of the adjustment configurations, for example the height adjustment configuration.

[0062] Due to the structure of the pulling mechanism, modifying the eccentric center distance R1 correspondingly modifies the amplitude of the stroke C11, that is to say the distance between the upper extreme position H11 and the lower extreme position B11 taken by the frame 11 when it is driven under the action of the actuator 20 while the adjustment system is in the locked configuration. In this case, the greater the distance R1, the greater the amplitude of the stroke C11, that is to say the greater the distance between the positions B11 and H11. Modifying the eccentric center distance R1 therefore makes it possible to modify the amplitude of the opening of the shed controlled by the frame 11.For example, it is provided that the distance R1 can be varied 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, that is to say with the positions B11 and H11 equidistant from the position P11. The reference position P11 is defined as being a central position, which can correspond to the crossing position of the loom 1 for all the layers of yarns.

[0063] Due to the structure of the pulling mechanism, changing the connecting rod center distance R2 correspondingly changes the height of the stroke C11 relative to the frame 12, i.e. 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 figure 1 . In particular, increasing the connecting rod center distance R2 shifts both the extreme position H11 and the extreme position B11 upwards relative to the position P11. Conversely, reducing the connecting rod center distance R2 shifts both the extreme position H11 and the extreme position B11 downwards relative to the position P11. Preferably, changing the distance R2 does not change the amplitude of the stroke C11, i.e. does not change the distance between the positions B11 and H11. Modifying the connecting rod center distance R2 therefore makes it possible to modify the crossing of the shed by adjusting the opening height of the shed 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 eccentric center distance R1 can be variable, the geometry of the eccentric system 30 is adjustable, and in particular the connecting part 32 is made mobile relative to the base 31. The adjustment system comprises locking means to selectively authorize 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 the present example, 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 and the base 31 are pivotable relative to each other about an axis X32, called the “crank axis”. The axis X32 is fixed relative to the base 31 and relative to 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 pivoted relative to the base 31 about the axis X32, the axis X41 is moved relative to the axis X20 along a circular path centered on the axis X32, which varies the distance R1, as shown in figure 6 In this sense, the connecting piece 32 constitutes a crank relative to the base 31.

[0066] In the example, as best seen on the figure 4 , the base 31 is constituted by a part which is generally flat in shape in a plane perpendicular to the axis X20. The base 31 comprises a main orifice 33, receiving the output shaft 28 of the actuator 20 so that the base 31 is secured to this shaft. Several fixing members are also provided, here four screws 34, distributed around the axis X20, to ensure the rotational solidarity 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 crank pin 95, visible on the figure 4 , which is received within the pinch ring 94. The crank pin 95 is in the form of a cylindrical member with a circular base, centered on the axis X32, and received within the jaws of the ring 94, of complementary shape. The crank pin 95 projects in the opposite direction from the crank pin 35 received in the articulation end 41, and is offset relative to the latter. Tightening of the pinch ring 94 around the crank pin 95 is ensured by a clamping screw 93, the head of which bears on one of the jaws of the ring 94, the body of which passes through this jaw and is screwed into a thread of the other jaw. The screw 93 is advantageously directed in an orthoradial direction relative to the axis X32, that is to say a direction perpendicular to a radius originating from the axis X32, and in a plane orthogonal to the axis X32.A screwing of the screw 93 tends to bring the jaws closer to each other, which causes centripetal clamping forces to be applied to the ring 94 on the crank pin 95, resulting in a tightening torque. The base 31 carries the connecting piece 32 by means of its crank pin 95, in that the crank pin 95 is received in the pinching ring 94.

[0068] The ring 94, the crank pin 95 and the screw 93 belong to the locking means of the adjustment system. Indeed, the part 32 and the base 31 can be secured by placing the screw 93 in a position for tightening the ring 94 around the crank pin 95. In the tightening position, the screw 93 tightens the ring 94 around the crank pin 95 so as to apply a tightening torque high enough that, during weaving, the part 32 remains stationary with respect to the base 31. In the locking configuration, it is therefore planned to place the screw 93 in the tightening position. In the amplitude adjustment configuration, the screw 93 is placed in a position for loosening the ring 94 around the crank pin 95, so that the ring 94 and the crank pin 95 form a pivot connection, allowing and guiding the pivoting of the part 32 relative to the base 31 around the axis X32.

[0069] Preferably, the adjustment system comprises braking means, in particular an amplitude adjustment brake. This amplitude adjustment brake ensures that, in the loosened position of the screw 93, the tightening torque exerted by the ring 94 on the crank pin 95 is non-zero, so as to constitute a braking torque, which, while allowing the pivoting of the connecting piece 32 relative to the base 31, resists this pivoting. More generally, while the adjustment system is in the amplitude adjustment configuration, the amplitude adjustment brake allows the movement of the connecting piece 32 relative to the base 31, but nevertheless brakes this movement by applying a torque and / or a braking force. This prevents, when the adjustment system is put in the amplitude adjustment configuration, the adjustment of the distance R1 from being modified immediately under the own weight of the parts of the machine.This reduces the need to provide for the actuator 20 to be equipped with a motor brake, which is economically advantageous. The braking torque provides a force below the application of a determined relative displacement force, such that the amplitude adjustment brake is configured to maintain the position of the connecting part 32 relative to the base 31 below the application of a determined relative displacement force while the adjustment system is in the amplitude adjustment configuration. This determined relative displacement force can be calculated as a function of the weight of the parts, the frame and the pulling mechanism, the lever arms or the friction between parts. The actuator is able to exceed this relative displacement force to rotate the base 31 and carry out the adjustment.

[0070] In this case, the amplitude adjustment brake, shown only on the figure 4 , includes a braking screw 91. To obtain the braking torque, a slight tightening of the pinch ring 94 around the crank pin 95 is ensured by the clamping screw 91, the head of which rests on one of the jaws of the ring 94, optionally by means of a set of Belleville-type elastic 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, being oriented head-to-tail. Thus, the screw 91 is advantageously directed in an orthoradial direction relative to the axis X32. To adjust the intensity of the braking torque, the screw 91 is screwed in or out.

[0071] There figure 6 shows a case 6A corresponding to an intermediate amplitude adjustment configuration, where the 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 the 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 the part 32 is oriented so that the distance R1 takes a maximum center distance value. Preferably, the adjustment system comprises amplitude adjustment stops, to limit the displacement, that is to say here the pivoting, of the connecting part 32 relative to the base 31, around the axis X32, between the position shown in case 6B where the distance R1 takes the minimum eccentric center distance value and the position shown in case 6C where the distance R1 takes the maximum eccentric center distance value.The movement of the part 32 is therefore carried out only between these two positions, without going beyond. For example, to constitute the amplitude adjustment stops, the base 31 carries a stop screw 38, which is implanted in the base 31 parallel to the axis X20, so that a head of the screw 38 projects from the surface of the base 31 on the side of the connecting part 32. In place of the screw 38, any projecting part, suitable for serving as a stop, can be provided. To constitute the amplitude adjustment stops, the connecting part 32 has two shoulders 39, which frame the stop screw 38. As shown in the . figure 6 for cases 6B and 6C, the screw 38 comes into abutment alternately against one and the other of the shoulders 39, so that the pivoting travel of the part 32 is limited. As shown in the figure 6 for case 6A, the screw 38 circulates freely between the shoulders 39 to obtain the intermediate values of the distance R1.

[0072] As illustrated on the figures 3 And 7 , so that the connecting rod center distance R2 can be variable, the articulation ends 41 and 42 of the connecting rod are movable relative to each other. The adjustment system comprises locking means for selectively authorizing this mobility, to obtain the height adjustment configuration, and prohibiting this mobility, to obtain the locked configuration or the amplitude adjustment configuration.

[0073] In the present example, so that the connecting rod center distance R2 is adjustable when the adjustment system is in the 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 comprises a connecting rod end piece 44, carrying the end 41, and a connecting rod end piece 45, carrying the end 42, the end piece 44 being slidably fitted into the end piece 45, which is in the form of a sheath to receive the end piece 44, in the form of a rod, and guide its sliding along the axis R40.

[0074] To form the locking means of the adjustment system, provision is made, for example, for the connecting rod 40 to comprise a stirrup 96, a pad 97 and at least one clamping screw 98, here three. The head of the screws 98 is accessible from the outside of the connecting rod 40. The stirrup 96 and the pad 97 are arranged inside the sheath of the end piece 45 and together constitute a locking clamp for the rod of the end piece 44. The stirrup 96 and the pad 97 are arranged in a pincer fashion 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 sheath and the rod of the end piece 44.The stirrup 96 is arranged between the other wall of the sheath and the rod of the end piece 44, being movable in translation in a direction perpendicular to the axis R40, between a clamped position, where the rod of the end piece 44 is clamped between the stirrup 96 and the pad 97, so that the end piece 44 is immobilized along the axis R40 relative to the end piece 45, and a loosened position, where the rod of the end piece 44 is sufficiently loosened to be able to slide. Screwing in the clamping screws 98 moves the stirrup 96 to the clamped position. Unscrewing the clamping screws 98 allows the stirrup to return to its loosened position.

[0075] Preferably, the braking means of the adjustment system comprise a height adjustment brake. This height adjustment brake ensures that, even in the released position of the locking means of the connecting rod 40, the clamping force applied by the stirrup 96 to 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, while 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, when the adjustment system is put in the height adjustment configuration, the adjustment of the distance R2 from being modified immediately under the own weight of the parts of the machine.This reduces the need to provide for the actuator 20 to be equipped with a motor brake, which is economically advantageous. The braking torque provides a force below the application of a determined relative displacement force, such that the height adjustment brake is configured to maintain the position of the second articulation end 42 relative to the first articulation end 41 below the application of a determined relative displacement force while the adjustment system is in the height adjustment configuration. This determined relative displacement force can be calculated as a function of the weight of the parts, the frame and the pulling mechanism, the lever arms or the friction between parts. The actuator is able to exceed this relative displacement force to cause a relative displacement of the ends 41 and 41 and carry out the adjustment.

[0076] In this case, the height adjustment brake, visible only on the figure 3 , comprises at least one spring 92, here two. To obtain the braking force, a slight tightening of the caliper 96 on the rod of the end piece 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 a central connecting rod center distance value, i.e. corresponding to the case where the 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 shifted 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 a maximum connecting rod center distance value, i.e. corresponding to the case where the stroke C11 is shifted towards its highest height relative to the reference position P11. The figure 7 shows a case 7D 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 comprises height adjustment stops, to limit the movement, that is to say here the sliding, of the ends 41 and 42 along the axis R40, between the position shown in 7B where the distance R2 takes the minimum value of the connecting rod center distance and the position shown in 7C where the distance R2 takes the maximum value of the connecting rod center distance. The relative movement of the ends 41 and 42 therefore takes place only between these two positions, without going beyond. For example, to constitute the height adjustment stops, the sleeve of the end piece 45 comprises a stop 46, formed by a parallelepiped block fixed by screw on the inside of the sleeve, and the rod of the end piece 44 comprises a groove, forming two shoulders 47 opposite each other, framing the stop 46.

[0079] As shown on the figure 7 for cases 7B and 7C, the stop 46 comes into abutment alternately against one and the other of the shoulders 47, so that the sliding travel 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 comprises a set of amplitude adjustment graduations, indicating an amplitude adjustment value depending on the eccentric center distance R1. In this case, the set of graduations is for example marked on the base 31 while a mark is marked on the connecting piece 32, or vice versa. Preferably, the adjustment system comprises a set of height adjustment graduations, indicating an amplitude adjustment value depending on the connecting rod center distance R2. In this case, the set of graduations is for example marked on the rod of the end piece 44 while the edge of the sleeve of the end piece 45 serves as a mark.

[0081] In the locked configuration of the adjustment system, used in particular during weaving carried out by the loom 1, the rotation of the eccentric system 30 around the axis X20 relative to the frame 12 by the actuator 20 causes the frame 11 to move, via the pulling mechanism. While the rotation of the eccentric system 30 is carried out without changing direction, the levers 50 and 70 pivot in oscillation and the frame 11 is in alternating translation. At each complete revolution of the eccentric system 30 around the axis X20 relative to the frame 12, the levers 50 and 70 have pivoted in one direction then in the other and have returned to their initial position, and the frame 11 has traveled the stroke C11 in both directions and has returned to its initial position. In detail, when the eccentric system 30 makes a first half-turn, the frame 11 is driven from the low extreme position B11 to the high extreme position H11.When the eccentric system 30 continues its rotation without changing direction, the frame 11 is driven in the opposite direction from the upper extreme position H11 to the lower extreme position B11.

[0082] The 80 locking system allows for a locking configuration, shown in 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, at the same time, 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 both the distance R2 is midway between the minimum connecting rod center distance value and the maximum connecting rod center distance value. The reference orientation is chosen to correspond to an orientation that the lever 50 takes when the lever 50 is halfway through its oscillation pivoting, the engine itself being at an angular position corresponding to midway between the two reverse positions of the connecting rod 40 in its oscillation cycle.

[0084] In the release configuration, the locking system 80 does not prevent the levers 50 from pivoting. Advantageously, the locking system 80 ensures the locking of all the levers 50. Alternatively, several locking systems 80 could be provided, each ensuring the locking of a group of levers 50 associated with a set of neighboring frames, or of 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 blocks the pivoting of the lever 50 at the reference orientation, the rotary electric actuator 20 varies the eccentric center distance R1, in the case where the adjustment system is in the amplitude adjustment configuration. Indeed, the lever 50 being immobilized, the rotation of the base 31 by the actuator 20 causes a variation of the center distance R1 by rotation of the base 31 relative to the connecting piece 32, around the axis X32. The center distance R1 is varied over its entire adjustment travel by making the base 31 travel an angular sector, preferably less than half a turn, using the actuator 20, as shown in the figure 6 . When the locking system blocks the pivoting of the lever 50 at the reference orientation, the rotary electric actuator 20 varies the eccentric center distance R2, in the case where the adjustment system is in the height adjustment configuration. Indeed, the lever 50 being immobilized, the rotation of the base 31 by the actuator 20 causes a variation of the center distance R2 by relative sliding of the ends 41 and 42. The center distance R2 is varied over its entire adjustment travel by making the base 31 travel an angular sector, preferably less than half a turn, using the actuator 20, as shown in the figure 7 . Thus, the adjustment of the crowd can be carried out via the actuator 20, whether the actuator is controlled by an automatic adjustment program, or by a person. Alternatively, the eccentric center distance R1 can be varied by manually driving the rotation of the base 31 by the operator. In this alternative, the use of the set of graduations can be advantageous to assist the operator.

[0086] In the present example, the locking system 80 comprises an upper rocker stop 81 and a lower rocker stop 82. The stop 81 is actuated to pivot relative to the frame 12, about an axis X81, by an actuator 83. The pivoting is carried out 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 released from the lever 50 so as not to oppose its pivoting. The stop 82 is actuated to pivot 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 is carried out 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, for a second direction of rotation of the lever 50, and a release position, where the stop 82 is released from the lever 50 so as not to oppose its pivoting. To mechanically cooperate with the stops 81 and 82, the arm 51 of the lever 50 comprises a lug 53 which comes into abutment with one and the other of the stops 81 and 82, when the stop concerned is in the stop position. When the two stops 81 and 82 are in the stop position, the locking configuration is reached to the extent that 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 which allows control of the orientation of the rotor around the axis X20. In particular, each actuator 20 comprises an encoder and / or a sensor system, the measurement of which makes it possible to determine the orientation of the output shaft 28, and therefore implicitly by conversion, the position of the base 31 of the eccentric system 30, around the axis X20, relative to the frame 12, with knowledge of the geometry of the system. Each actuator 20 advantageously comprises output plugs, connectable to a network 22 of the weaving loom 1, such as a measurement bus, to transmit said measurement.

[0088] The shedding machine 2 advantageously comprises one or more actuator microcontrollers 23 for controlling the actuator 20 by controlling the power circuit 21 distributing the electrical energy to this actuator 20, taking into account said measurement of the orientation of the output shaft 28, recovered via the network 22.

[0089] The loom 1 advantageously comprises a master controller 24, which exchanges data with the actuator microcontroller(s) 23. The master controller 24 can execute a weaving program to control the weave of the weaving machine, by controlling the actuators 20, and other programs, such as an adjustment program, a calibration program, etc. For control, the microcontroller 23 and / or the master controller 24 take into account a library, which includes certain data, in particular notable pre-recorded actuator positions, entered at the terminal, or entered by calibration procedure. Advantageously, the controller has memories for the data libraries. A memory is adapted to record current position data of the actuator or data relating to predetermined positions to be reached.For example, a memory can memorize the position of the rotary actuator corresponding to the stop position on a stop 39 during amplitude adjustment. The controller can call upon its memories and the position data at any time to carry out control steps. The controller is associated with a calculator and a comparator in the servocontrol of the actuator which make it possible to quantify the movements necessary to reach predetermined positions. In particular, the controller knowing the current position of the actuator calculates the predetermined angle corresponding to the predictable rotation according to the position of a stop to be reached. The memories are configured to capture, store or restore this data to the controller.

[0090] Each actuator 83 and 84 is preferably a servomotor, or any other type of electric motor which allows control of the orientation of the stops 81 and 82 around their respective axis X81 and X82. In particular, each actuator 83 and 84 comprises an encoder and / or a sensor system, the measurement of which makes it possible to determine the orientation of the stop concerned. Each actuator 83 and 84 advantageously comprises output plugs, connectable to a network 86 of the weaving loom 1, such as a measurement bus, to transmit said measurement. The loom 1 advantageously comprises one or more actuator microcontrollers 87 for controlling 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, recovered via the network 86. The master controller 24 exchanges data with the actuator microcontroller(s) 87.

[0091] The loom 1 preferably comprises a terminal 25 to allow a person to control and / or configure the operation of the loom 1 via the master controller 24. For example, the terminal 25 offers the person the start of a specific step of an adjustment procedure, to validate that a manual step has been carried out and / or to enter parameters. The terminal 25 is used to display information on the progress of the procedure and to indicate warning signals to the user.

[0092] The loom 1, and more particularly each shedding machine 2, makes it possible to implement an adjustment process defined below and illustrated in the figure 17 .

[0093] When the loom 1 has been assembled for the first time, or during a maintenance or calibration operation, for all or some of the machines 2, remarkable angular positions are recorded for the rotor of the actuator 20, corresponding to available shed configurations and to a positioning of the frame 11 in its travel. In particular, remarkable 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 remarkable angular positions corresponding to shed amplitude and height adjustment configurations are also stored, the machine or the operator being able to call upon these configurations to adjust the adjustment system.Similarly, remarkable angular positions are recorded at the memory level for each adjustment configuration, corresponding to different cases where the ends 41 and 42 are in abutment, and where the connecting piece 32 is in abutment relative to the base. Many configurations are possible, insofar as, depending on the height adjustment, the angular position of the actuator 20 to reach the amplitude adjustment stops changes, and vice versa. This data is recorded in the data library, physically at the level of the controller memories.

[0094] For example, it is possible to choose to record, while the lever 50 is in the reference orientation, for a minimum value, a median value and a maximum value of the distance R2, the minimum and maximum angular positions of the actuator 20, corresponding to the screw 38 being in abutment alternately with the shoulders 39, and, for a minimum value, a median value and a maximum value of the distance R1, the minimum and maximum angular positions of the actuator 20, corresponding to the stop 46 being in abutment, 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 the minimum and maximum angular positions are target values, if it is desired to perform adjustment fault detections.

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

[0096] In summary, the actual adjustment method first comprises a step a comprising pivoting the lever 50 to the reference orientation, by rotating the eccentric system 30 by means of the rotary electric actuator 20, while the adjustment system is in the locked configuration and the locking system 80 is in the release configuration. The method then comprises a step b comprising placing the locking system 80 in the locking configuration, which immobilizes the lever 50 in the reference position. The method then comprises a step c comprising placing the adjustment system in the adjustment configuration. This may be the amplitude adjustment configuration, or the height adjustment configuration. When it is desired to adjust the height and the amplitude, this is done successively, in the desired order.In the case where the adjustment system is in the amplitude adjustment configuration, the method comprises a step d1 of adjusting the eccentric center distance R1 by rotating the eccentric system 30 using the rotary electric actuator 20, the adjustment method using data in memory, corresponding to a target value or an incremental value relating to a desired frame height. In the case where the adjustment system is in the height adjustment configuration, a step d2 of adjusting the connecting rod center distance R2 is provided instead of step d1 by rotating the eccentric system 30 using the rotary electric actuator 20, the adjustment method using data in memory, corresponding to a target value or an incremental value relating to a desired frame height.Once the adjustment has been made, the method comprises a step e comprising placing the adjustment system in a locked configuration. Finally, the method comprises a step f of placing the locking system 80 in a release configuration. Weaving can be carried out with the new adjustment.

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

[0098] To carry out 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 the release configuration. Then, all the lugs 53 are positioned above the stop 82. It is advantageously provided that the actuators 20 position the eccentric system 30 so that the end 41 is positioned in an upper quadrant of rotation of the actuator 20, so that the adjustment system is accessible to the person 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. Then, under the action of the actuators 20 controlled by the controllers 23 and 24, the levers 50 are pivoted until they come into abutment against the stop 82, as shown in case 5C. At least for this step, it is provided that the motor torque of the actuator 20 is restricted below a predetermined adjustment torque value.With the torque thus limited, the approach of the stop 82 by the lever 50 is carried out without risk of breakage, and the actuator 20 can detect when the lever 50 is at the stop. If the actuator 20 is a servomotor, its power supply is cut off so that it no longer presents a motor brake, 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 that moment is memorized 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 blocking configuration, the assembly formed by the frame, the connecting rods, the levers and the eccentric systems are fixed relative to the frame 12 of the loom 1.

[0099] In this example, steps a and b are therefore carried out fully automatically, under the control of the person. Alternatively, manual steps are provided, particularly in the case of a non-motorized locking system, where the person manually tilts the stops 81 and / or 82. Alternatively, a single actuator tilts the two stops 81 and 82 in a time-shifted manner.

[0100] At this stage, before starting step c, the method advantageously comprises a so-called blocking control step, which aims to verify whether the blocking system 80 actually immobilizes the lever 50. This step comprises a restoration of the power supply to the actuator 20, with clamping below the setting torque value. The blocking control step comprises a step b1 to verify that the rotary electric actuator 20 does not rotate, including a transmission of a rotation drive instruction by the actuator 20, i.e. a rotation command of the actuator 20, then a measurement of the rotation angle described by the eccentric system 30 while the actuator 20 has executed this drive instruction. Finally, step b1) includes a comparison of the measured rotation angle with a target value, to establish whether the blocking system 80 is duly in the blocking configuration, or in a blocking fault situation.Preferably, rotation of the actuator 20 is provided in both directions, which makes it possible to verify that the two stops 81 and 82 actually block 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 engine torque being monitored during this measurement. In practice, to consider that the locking system 80 is duly in the locking configuration, it is verified that the rotation angle is zero or almost zero while the delivered engine torque is greater than the passive torque of the system, of the order of twice the torque exerted on the engine by the weight of the frame and the transmission, insofar as, in the locking configuration and in the locked configuration, the pulling mechanism is normally entirely immobilized. In this case, the adjustment method is continued.On the contrary, it is considered that the locking system is not in the locking configuration when the actuator 20 has traveled a non-zero angle, or one 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 may have been carried out previously, a previous adjustment process may have been carried out successfully, or the person has not yet intervened to put the adjustment system in the adjustment configuration. In any event, if it is considered that the locking system 80 is not in the locking configuration, a step b2 is provided including issuing an alarm to the person, for example via the terminal 25, signaling 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 them in the locking 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 of setting the adjustment configuration is carried out manually by the person. For safety reasons, it is provided that the electrical power supply to the actuator 20 is cut off while the person moves the adjustment system from the locked configuration to the adjustment configuration. In practice, the person unlocks the locking means manually. In the present example, the person loosens either the screws 93 without loosening the screws 98, to move to the amplitude adjustment configuration, or the screws 98 without loosening the screws 93, to move to the height adjustment configuration. Once in the adjustment configuration, the braking means 91 and / or 92 prevent the pulling mechanism from becoming deregulated under its own weight, by preventing the variation of the distance R1 or R2 which has been made adjustable.

[0102] Preferably, the method comprises a preliminary control step, carried out after step c and before step d1 or d2, to verify that the desired adjustment configuration has been duly achieved, i.e. that the correct screws have been loosened, and that they have actually been loosened. This preliminary control includes a step c0 of transmitting a rotational drive instruction for the system 30 by the actuator 20, i.e. of controlling the rotation of the actuator 20. In practice, the actuator 20 executes the instruction until one of the stops is reached, to serve as a reference. At this time, a step c1 is provided for measuring the rotation angle that has been described by the eccentric system 30 having executed this instruction. Depending on the situation, this stop corresponds to one of the minimum or maximum center distance, connecting rod or eccentric values.A step c1' is then provided for comparing the measured rotation angle with a predetermined angle corresponding to the predictable rotation based on the position of the stop, to establish whether the shed forming machine 2 is in a nominal situation or in a fault situation, such as a loosening fault or an adjustment fault.

[0103] This preliminary check then includes a step c2 of transmitting a rotation drive instruction for the system 30, in the opposite direction, by the actuator 20. In other words, the actuator 20 is controlled in rotation. In practice, the actuator 20 executes the instruction until it reaches another stop. This other stop corresponds to the other minimum or maximum center distance, connecting rod or eccentric value. These instructions are transmitted while the actuator 20 is clamped below the adjustment torque value, to avoid any risk of breakage if the stop is not encountered for the expected angular position, and also to be able to detect the resistance of the stop. The preliminary check includes a step c3 of measuring the rotation angle described by the rotor, that is to say by the eccentric system 30, following the execution of the rotation instruction, where the actuator 20 is assumed to have driven the pulling mechanism from the first stop to the second stop.The pre-check includes a step c4 of comparing the measured angle with a target value that has been pre-stored in the library, to establish whether the machine 2 is in a nominal situation, or in a fault situation, such as a loosening fault or an adjustment fault. In other words, the measured angle is compared with a predetermined angle corresponding to the rotation predictable from the position of the adjustment stop.

[0104] For example, if the measured angle is zero or very small, it is identified that the adjustment system has remained in the locked configuration. This is a loosening fault. For example, if the measured angle corresponds to that of an amplitude adjustment range, while the desired setting was to be in the height adjustment configuration, it is identified that the adjustment system was put in the amplitude adjustment configuration by mistake. This is another loosening fault. For example, if the measured angle corresponds to that of a height adjustment range, while the desired setting was to be in the amplitude adjustment configuration, it is identified that the adjustment system was put in the height adjustment configuration by mistake. This is another loosening fault.For example, if the measured angle corresponds to the sum of the height adjustment and amplitude adjustment ranges, it is identified that the adjustment system has been put into a configuration where both distances R1 and R2 are variable, by loosening all the locking means of the adjustment system. This is another loosening fault. For example, in the case where the measured rotation angle does not correspond at all to an angle corresponding to the previous situations, this may be an adjustment fault, indicating that a previously executed adjustment process was carried out incorrectly or that the adjustment system became unadjusted during weaving.

[0105] When a fault is detected, a step c5 is provided for issuing an alarm, preferably to the person, for example via the terminal 25, to indicate to the person that a fault has occurred, and the type of fault identified. The adjustment method is interrupted so that corrective measures can be taken, in particular to carry out the adjustment configuration step correctly. Otherwise, the method goes directly to the adjustment step d1 or d2.

[0106] Alternatively, the pre-checking step can be performed by checking the reaching of a single stop from an expected angular displacement range to the first stop.

[0107] Providing that the lever 50 is locked at the reference orientation by the locking system 80 makes it possible to carry out the amplitude adjustment step d1 or the height adjustment step d2 by actuating the actuator 20. To carry out the adjustment, it may be provided that the actuator 20 is actuated at the command of the person, for example via the terminal 25. For example, it may be provided that the person orders the actuator 20, via the terminal 25, increments of rotation of the actuator 20 until the desired setting for the amplitude or height of the stroke C11 is reached. It may also be provided that the person orders the actuator 20 to position the output shaft 28 directly at a target angular value, in order to reach the desired setting. The rotary electric actuator 20 is controlled in rotation according to a target value or incremental value setpoint relating to a desired frame stroke or a desired frame height.In other words, the rotation control of the rotary electric actuator comprises a transmission of a target value or an incremental value to the rotary electric actuator 20, relating to an increase or a decrease in a setting, among the setting of the eccentric center distance R1 or the setting of the connecting rod center distance R2. The rotary electric actuator 20 is thus driven by the predetermined value. It is also possible to provide that the person directly indicates the desired setting, and that the actuator 20 then takes the angular position necessary to achieve this setting, on the basis of the information contained in the library. It is also possible to provide that the person can check the setting using the set of graduations carried by the pulling mechanism.To carry out the adjustment, it is also possible to provide that the actuator 20 is actuated automatically by the controller 24 to carry out the adjustment without intervention from the person, possibly under the supervision of the person, the controller 24 executing a pre-recorded adjustment program. To check whether the desired amplitude or height value is reached, it is advantageous to provide that the terminal 25 indicates, on the basis of the angular position information provided by the actuator 20, the current adjustment. It is possible to provide that all the actuators 20 carry out the adjustment of the machines 2 at the same time, in particular if the adjustment is carried out automatically on the basis of the pre-recorded adjustment program.

[0108] During the adjustment step, whether it is step d1 or step d2, it may be provided that the motor torque of the actuator 20 is restricted below the adjustment torque value. For verification of the adjustment by the person, it may be provided to cut off the electrical power supply to the actuator 20 for safety reasons. Once the adjustment has been carried out, the angular position of the actuator 20 is stored in the library as the current adjustment for the machine 2 concerned. This adjustment value may be called upon later, for example during a new adjustment process.

[0109] Once the height adjustment step d2 has been carried out, a new step c of setting the amplitude adjustment configuration can possibly be provided, followed by a new step d1 of adjusting the amplitude. If the amplitude adjustment step d1 was carried out first, a new step c of setting the height adjustment configuration can be provided, followed by a new step d2 of adjusting the height. As seen previously, the new step c of setting the adjustment configuration can be followed by a control step prior to the adjustment step. Since step c requires manual intervention, as seen previously, it is possible to cut off the power supply to the actuator 20.

[0110] Once the adjustment step d1 and / or d2 is completed, step e of placing the adjustment system in the locked configuration is implemented. This step is carried out manually by the user, who locks the locking means, here by tightening the screws 93 or 98. For safety reasons, it is advantageous to cut off the power supply to the actuator 20 during this step. During this step e, the locking system 80 is always in the locking configuration to keep the levers 50 immobile. Once this step e is completed, the distances R1 and R2 are fixed, since the ends 41 and 42 are secured and since the connecting piece 32 is secured to the base 31.

[0111] Preferably, once step e of setting the locked configuration is completed, a locking control step is implemented, in order to ensure that the machines 2 are duly in the locking configuration after the manual intervention of the person. For this locking control step, the blocking system 80 is maintained in the blocking configuration. For this locking control step, the power supply to the actuator 20 is restored. Preferably, the torque of the actuator 20 is restricted below the setting torque value.The locking control step comprises a transmission of a rotational drive instruction by the actuator 20, a measurement of the rotation angle described by the eccentric system 30 while the actuator 20 has executed this drive instruction, and a comparison of the measured rotation angle with a target value, to establish whether the adjustment system is duly in the locked configuration, or in a locking fault situation. Preferably, rotation of the actuator 20 is provided in both directions. In other words, a step e1 is provided for verifying 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 adjustment system is duly in the locked configuration, it is verified that the rotation angle is zero or almost zero while the delivered engine torque is greater than the passive torque of the system, of the order of twice the torque exerted on the engine by the weight of the frame and the transmission, insofar as, in the blocking configuration and in the locked configuration, the pulling mechanism is normally entirely immobilized. In this case, the adjustment method is continued. On the contrary, it is considered that the locking system is not in the locked configuration when the actuator 20 has traveled a non-zero angle, or greater than a predetermined threshold. At this stage, it is known that this is not a blocking fault, since the previous steps, in particular the adjustment step, could have been executed.If it is considered that the adjustment system is not in the locked configuration, a step e2 is provided including issuing an alarm, preferably to the person, for example via the terminal 25, signaling the locking fault. Then, the method is interrupted so that corrective measures can be taken. For example, step e of setting the locked configuration can be restarted, or a corrective action can be triggered via the controller if the system has electronic locking means to be implemented.

[0112] To carry out step f of setting the locking system into release configuration, the procedure is essentially reversed to steps a and b, i.e. 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 switched to the release position using the actuator 83 to arrive at case 5C, while the power supply to the actuator 20 is advantageously cut off. Then, the actuator 20 is powered, so that the actuator 20 actuates the pulling mechanism to orient the lever 50 so as to move the lug 53 away from the stop 82, thus arriving at case 5B of the figure 5 . Finally, the stop 82 is moved to the release position, so that the locking system 80 is entirely in the release configuration. Alternatively, step f may be modified depending on the design of the locking system 80, potentially including a manual step, as explained above for the step of placing in the locking configuration.

[0113] It is optionally expected that the person will confirm, via terminal 25, that the adjustment process has been successfully completed. Weaving can then be started with the new shed adjustment.

[0114] In the locked configuration of the adjustment system and in the blocking configuration of the blocking system, provision may be made to transmit a movement instruction to the actuator 20, for example by alternating instructions in one direction of rotation then in the opposite direction, back and forth, and to measure the amplitude available for rotating the rotor, which is analyzed by the controller 24. This amplitude reflects the sum of the clearances between the lever 50 and the eccentric system 30, in particular in the articulations at the level of the bearings of the connecting rod 40 and the lever 50. This amplitude may be interpreted by the controller 24 as mechanical clearances with knowledge of the geometry of the shed-forming machine concerned. This operation may be carried out for each drawing mechanism of the weaving loom. This operation may be carried out during the locking control step described above.In addition, it is possible to monitor the drift of these mechanical clearances during the weaving cycles, and to compare all of these measurements with each other and / or from one shedding machine to another, in order to estimate the possible degradation of mechanical components, and anticipate their replacement. Knowledge of the shedding height and the shedding amplitude for each shedding machine also makes it possible to refine the predictive damage calculation models and to indicate performance indices or utilization rates for the installation to the operator.

[0115] Optionally, when it is desired to carry out a 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 not accessible to the person, which reduces the risk of the person accidentally putting the adjustment system into the amplitude adjustment configuration by loosening the screw 93.

[0116] Optionally, a cover is provided which covers the screws 98 when it is desired to carry out an amplitude adjustment configuration, to reduce the risk of the person accidentally putting the adjustment system into the height adjustment configuration by loosening the screws 98. Similarly, a cover can be provided which covers the screws 93 when it is desired to carry out a height adjustment configuration.

[0117] Alternatively, it is provided that the actuator 20 has braking means embedded in the casing, or that the actuator 20 comprises 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 jack adapted to act on the walls of the lug 53.

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

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

[0121] In a variant not shown, the actuators 20 are installed head to tail on the frame 12.

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

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

[0124] Alternatively, the connecting piece is movable 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 is constituted by 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 for changing the 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 made. In particular, when two actuators 20 are required to make the same weave in a weaving configuration during several insertion cycles, a first actuator 20 can be actuated in a clockwise direction and the other actuator 20 in a counterclockwise direction so that their operation is balanced from a kinematic point of view and the movement of the unbalanced masses linked in particular to the eccentric systems 30 is symmetrized for the loom, which limits the loads in the joints and preserves the loom.

[0128] The method 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 or similarly functional elements provided for the embodiment of the figures 1 à 7 and subsequent embodiments are designated with the same reference signs.

[0130] For Loom 101 of the figure 8 , the locking system 80 has been replaced by a locking system 180, which includes a stop 181 in place of the stops 81 and 82. To move between the release configuration and the locking configuration, it is provided that the stop 181 translates along an axis Y181, perpendicular to the axes Z11 and X20, for example under the action of a jack not shown. The stop 181 is at the height of the lug 53 of the levers 50, when the levers 50 are in the reference orientation. The stop 181 comprises a groove 182, parallel to the axis X20 and open in the direction of the levers 50, within which the lugs 53 are received when the locking system 180 is in the locking configuration. In the release configuration, the stop 181 is released 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 the system 30, nevertheless ensures the same functions.

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

[0133] Along the axis X20, the base 231 is arranged between the actuator 20 and the connecting piece 232. The base 231 is fixed on the output shaft 28 of the actuator 20, so as to be directly driven in rotation about the axis X20 by the actuator 20, relative to the frame 12. The axis X20 is fixed relative to the frame 12 and relative to the base 231. The orientation of the output shaft 28 about the axis X20 corresponds to that of the base 231. Via the base 231, the eccentric system 230 as a whole is driven in rotation by the actuator 20 about the axis X20. The lever 50 is driven according to the oscillating pivot 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, so that the connecting rod 40 and the connecting piece 32 are pivotable relative to each other about the eccentric axis X41, fixed relative to the connecting rod 40 and relative to the connecting piece 232. The circular flange of the articulated end 41 receives within it a crank pin 235 belonging to the connecting piece 32, the crank pin 235 being pivotally supported within the flange, by means of the bearing 43. The axes X41 and X20 are spaced from each other by the eccentric center distance R1. When the eccentric system 230 rotates about the axis X20, the axis X41 rotates about the axis X20.

[0134] In the present example, so that the eccentric center distance R1 is adjustable when the adjustment system is in the amplitude adjustment configuration, the connecting piece 232 and the base 231 are pivotable relative to each other about an axis X232, called the “crank axis”. The axis X232 is fixed relative to the base 231 and relative to 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 pivoted relative to the base 231 about the axis X232, the axis X41 is moved relative to the axis X20 along a circular path centered on the axis X232, which varies the distance R1. In this sense, the connecting piece 232 constitutes a crank relative to the base 231.

[0135] The base 231 is constituted by a part which is generally flat in shape in a plane perpendicular to the axis X20. The base 231 comprises a main orifice 233, receiving the output shaft 28 of the actuator 20 so that the base 231 is secured to this shaft. Several fixing members are also provided, here four screws 234, distributed around the axis X20, to ensure the rotational solidarity 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 pinch ring 294, with two jaws radially surrounding the crank axis X232. The base 231 forms a crank pin 295, which is received within the pinch ring 294. The crank pin 295 is in the form of a cylindrical member with a circular base, centered on the axis X232, and received within the jaws of the ring 294, of complementary shape. The crank pin 295 projects from the flat part of the base 231, in the same direction as the crank pin 235, and is offset relative to the latter. A tightening of the pinch ring 294 around the crank pin 295 is ensured by a clamping screw 293, the head of which rests on 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 in an orthoradial direction relative to the axis X232.A screwing of the screw 293 tends to bring the jaws closer to each other, which causes centripetal clamping forces to be applied to the ring 294 on the crank pin 295, resulting in a tightening torque. The base 231 carries the connecting piece 232 by means of its pinching ring 294, in that the crank pin 295 is received in the pinching ring 294.

[0137] The ring 294, the crank pin 295 and the screw 293 belong to the locking means of the adjustment system. Indeed, the part 232 and the base 231 can be secured by placing the screw 293 in a position for tightening the ring 294 around the crank pin 295. In the tightening position, the screw 293 tightens the ring 294 around the crank pin 295 so as to apply a tightening torque high enough that, during weaving, the part 232 remains stationary with respect to the base 231. In the locking configuration, it is therefore planned to place the screw 293 in the tightening position. In the amplitude adjustment configuration, the screw 293 is placed in a position for loosening the ring 294 around the crank pin 295, so that the ring 294 and the crank pin 295 form a pivot connection, allowing and guiding the pivoting of the part 232 relative to the base 231 around the axis X232.

[0138] Preferably, the adjustment system comprises 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 embodiment of the figures 9 And 10 includes amplitude adjustment stops, to limit the movement of the connecting piece 232 relative to the base 231, around the axis X232, between a position where the distance R1 takes the minimum eccentric center distance value and a position where the distance R1 takes the maximum eccentric center distance value. For example, to constitute the amplitude adjustment stops, the connecting piece 232 carries a stop screw 238, parallel to the axis X20, so that a head of the screw 238 projects from the surface of the connecting piece 232 on the side of the base 231. As better seen on the figure 10 , to constitute the amplitude adjustment stops, the base 231 comprises two shoulders 239, which frame the stop screw 238. The screw 238 comes into abutment alternately against one and the other of the shoulders 239, so that the pivoting travel of the part 232 is limited. The screw 238 circulates freely between the shoulders 239 to obtain the intermediate values of the distance R1.

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

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

[0142] As shown on the figure 13 , the actuator 320 is an electric motor, which comprises 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 fixing plate 373, perpendicular to the axis X20, closing a front end of the cylindrical wall and serving to fixedly attach the stator 326 to the frame. A rotor 327 is supported by the stator 326, so as to be pivotable about the axis X20 relative to the stator 326. The rotor 327 is coaxial with the axis X20 and is contained in the stator 326. A front end of the rotor 327 here forms an output shaft 328 of the actuator 320, which passes through the fixing plate and opens out. When the actuator 320 is appropriately electrically powered by the power circuit 21, the output shaft 328 is driven into rotation in a driving manner around the axis X20 by the rotor 327.

[0143] Alternatively, as explained above, it may be provided that the rotor and the output shaft are separate and non-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 the electrotechnical techniques known to those skilled in the art. The resolver rotor is preferably secured to a hollow support fixed to a rear end of the output shaft 328, so that the clamping screw 393 passes through the hollow support and the resolver rotor, right through. The resolver stator is secured to the frame 374 of the stator 326. The measurement of the resolver resulting from the rotation of its rotor in its stator makes it possible to determine the position of the base 31 relative to the frame 20. Advantageously, the actuator 320 has a measuring means while preserving the functions of the clamping screw 393.

[0145] Preferably, as for the actuator 20, it is provided that, during weaving, the actuator 320 performs a continuous rotation, that is to say a rotation without change of direction. Preferably, the actuator 320 is a servomotor, or any other type of electric motor which allows control of the orientation of the rotor 327 around the axis X20. In particular, each actuator 320 comprises an encoder and / or a sensor system, not illustrated, the measurement of which makes it possible to determine the orientation of the output shaft 328, according to the same principle as for the actuator 20. Each actuator 320 advantageously comprises output plugs, connectable to a network 22 of the weaving loom 1, such as a measurement bus, to transmit said measurement. The same controllers as those described previously are used to control the actuator 320 as to control the actuator 20.

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

[0147] As visible on the figure 13 , in the present embodiment, the base 331 and the output shaft 328 are formed by the same part, in one piece, for reasons of compactness. However, it could be provided that these two elements are formed by separate parts, fixed to each other.

[0148] The base 331 here forms a discoid plate perpendicular to the axis X20, formed at one end of the output shaft 328. Along the axis X20, the base 331 is arranged between the plate 373 of the actuator 320 and the connecting piece 332. The base 331 is directly driven in rotation around 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 eccentric system 330 as a whole is driven in rotation by the actuator 320 around the axis X20.

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

[0150] In the present example, the flange 336 forms a flat part, perpendicular to the axis X20 and crossed by the axis X20. Along the axis X20, the flange 336 is arranged between the base 331 and the connecting part 332. In the example, the connecting part 332 is of generally cylindrical shape with a circular base, and is centered on the axis X41. The axes X41 and X20 are distant from each other by the eccentric center distance R1. The connecting part 332 projects relative to the flange 336, in a direction opposite to the actuator 320. In the example, the part 332 is itself produced by assembling two parts connected by a screw, but it could be provided that the connecting part 332 is made of a single part.

[0151] To assemble the connecting piece 332 with the flange 336, it is advantageous to provide that the connecting piece 332 comprises a finger 375, visible on the figures 13 And 15, coaxial with the axis X41, projecting from the connecting piece 332 towards the flange 336, and passing through an orifice 376 of the flange 336. The orifice 376, visible on the figures 13 And 14 , is advantageously coaxial with the axis X41. In addition, the fixing of the assembly of the flange 336 with the connecting piece 332 is for example carried out using fixing means such as screws, here three screws 337, parallel to the axis X41. These screws 337 are symbolized by their axis 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 12, the articulation end 41 of the connecting rod 40 is coupled to the connecting piece 332, so that the connecting rod 40 and the connecting piece 332 are pivotable relative to each other around the eccentric axis X41, fixed relative to the connecting rod 40 and relative to the connecting piece 332. The circular flange of the articulation end 41 receives within it the crank pin formed by the connecting piece 332, absent from the figure 14 , but visible on the figures 11 à 13 And 15 . The connecting piece 332 is pivotally supported within the end flange 41, by means of the bearing 43.

[0153] In this example, in order to obtain that the distance R1 is variable when the adjustment system is in the amplitude adjustment configuration, the connecting piece 332 is supported by the base 331 while being, 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 to say that it intersects the axis X20 and is perpendicular to the axis X20. For any position of the connecting piece 332 relative to the base, the axis R332 intersects the axis X20 and the axis X41. By translational displacement of the connecting piece 332 relative to the base 331 along the axis R332, the distance R1 is varied. Indeed, the axis X41 being fixed relative to the connecting part 332 and the axis X20 being 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 being able to be fixed in rotation and in radial translation relative to the base 331, it is provided for example that the flange 336 comprises an oblong orifice 377, clearly visible on the figure 14 , and that the eccentric system 330 comprises a rod 378. The oblong orifice 377 passes through the flange 336 from one side to the other, 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 a sliding of the oblong orifice 377 along the axis R332, and a pivoting of the oblong orifice around the axis X20.

[0155] Preferably, the rod 378 comprises a clamping screw 393 and a clamping nut 394, thereby constituting the locking means of the adjustment system for selectively fixing and allowing 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 orifice 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 to the rotor by tightening the flange 336 along the axis X20.Thus, to obtain the amplitude adjustment configuration, the screw 393 and the nut 394 are loosened, which allows the translation and rotation of the connecting piece 332 relative to the base 331. To obtain the locked configuration, the screw 393 and the nut 394 are tightened, which secures the connecting piece 332 with the base 331. Also, the flange 336 is secured with the connecting piece 332 and the base 331.

[0156] As visible 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 that carrying the flange 336. The head of the screw 393 is therefore very easily accessible for a person, having to switch the adjustment system between the adjustment configuration and the locked configuration, by screwing or unscrewing the screw 393 via its head.

[0157] Preferably, the adjustment system comprises 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 in axial support 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 while the adjustment system is in the amplitude adjustment configuration.

[0158] To allow particularly precise adjustment of the distance R1, while making possible adjustment by rotation of the base 331 according to the method described above and illustrated in the figure 17 , it is provided here that the radial translation position of the connecting piece 332 relative to the base 331, along the axis R332, is subject to the orientation of the connecting piece 332 relative to the base 331 around the main axis X20. In other words, pivoting the piece 332 and the flange 336 relative to the base 331 around the axis X20 causes 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 movement of the piece 332 and the flange 336 relative to the base 331 is done along a single trajectory, comprising radial translation and rotation. It is advantageously provided that, for an initial orientation of the piece 332 relative to the base 331, shown in the figure 11 , the radial translation position of the part 332 corresponds to a minimum distance R1 between the axes X20 and X41. When the part 332 is rotated from this initial orientation in the same direction, the radial translation of the part 332 takes place in a single direction along the axis R332, gradually increasing the distance R1 up to a maximum shown on the figure 12 . When part 332 is rotated from the orientation shown in the figure 12 , in the opposite direction, the radial translation of the part 332 is also carried out in the opposite direction along the axis R332, until gradually returning to the minimum distance R1 shown on the figure 11 .

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

[0160] The cam groove 379 is here constituted by a groove, which is formed on the surface of the base 331 and which 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 trajectory, which bypasses the axis X20, as clearly visible on the figures 11 , 12 And 14 .

[0161] As shown on the figure 13, the 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 passes through the flange 336 going beyond the flange 336 to the groove 379. Thus received in the groove 379, the finger 375 is guided in sliding along said groove 379 and is therefore forced to remain on the trajectory that it describes. Here, the axis X41 follows the same trajectory as the finger 375, being coaxial with this finger 375. The finger 375 cooperating with the groove 379 to circulate along a single trajectory, the radial translation and the pivoting of the connecting piece 332 are entirely subject. 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 in one piece with the flange 336.

[0163] The groove 379 comprises ends 339, which, together with the finger 375, form amplitude adjustment stops belonging to the adjustment system, in that the ends 339 limit the movement 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 a 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 obtain the amplitude adjustment configuration, it is provided that the connecting piece 332 is movable along a predetermined trajectory relative to the base 331, by cooperation between a cam groove and cam follower carried by these pieces, to vary the center distance R1. Here, the locking means are formed by the flange 336, the clamping screw 393 and the clamping nut 394, to fix the position of the connecting piece 332 relative to the base 331, along the cam groove 379, to obtain the locked configuration. However, another locking means could be provided 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 subject to radial translation.

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

[0166] The actuator 420 is identical to the actuator 320 and the eccentric system 430 is identical to the eccentric system 330 except for the differences mentioned below. The identical components are repeated on the figure 16 with the same reference signs as for actuator 320.

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

[0168] Preferably, the follower finger is a nut 489 having a head, which is radially protruding relative to the axis X40, and which is received in the cam groove 479, which has edges 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 locking means without providing the function of braking means, while the follower finger 475 and a spring 491, described below, provide the function of braking means without providing the function of locking means.

[0170] Preferably, the spring 491 is for example axially interposed between the connecting piece 332 and the nut 489. The spring 491 is here constituted by a spring washer present in a groove of the nut 489. Thus, even when the rod 378 and the nut 394 are loosened, the spring applies, by elasticity, an axial force which keeps the connecting piece 332 slightly in axial support against the base 331, under the action of the nut 489 cooperating with the edges of the cam groove 479. Thus, the spring 491, combined with the nut 489, brakes the movement of the connecting piece 332 relative to the base 331 while the adjustment system is in the amplitude adjustment configuration. In the case where the braking is provided by the spring 491, the spring 391 is advantageously not necessary.

[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 braking torque most suitable for maintaining the relative position between the connecting part 332 and the base 331.

[0172] In a variant not shown, it is possible to provide for the follower finger 475 to perform both the 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, but whose location is designated by the reference 488. The clamping screw is screwed into the nut 489 coaxially with the axis X40. The clamping screw then has a head, which is accessible from an axial face of the connecting piece 332 for screwing and bearing against the connecting piece 332. Tightening the clamping screw with the nut 489 places the head of the clamping screw in axial bearing against the connecting piece 332 and the head of the nut in axial bearing, in the opposite direction, against the edges of the cam groove 479, which prevents the movement of the connecting piece 332 relative to the base 331 by locking. This variant does not require the use of the rod 378 for locking.In the case where the locking is ensured by the follower finger 475 as described above, it can be provided that the screw 393 and the nut 394 of the rod 378 do not serve as a locking means for the amplitude adjustment system. During weaving and during adjustment, the screw 393 and the nut 394 are loosened to always allow the movement of the flange 336 and the connecting piece 332 relative to the base 331, by cooperation of the rod 378 with the oblong orifice 377. A cover 499 is then advantageously provided to prevent access to the head of the screw of the rod 378 by a person.

[0173] For this variant, in the amplitude adjustment configuration, the clamping screw and the nut 489 are loosened, so that the follower finger 475 circulates in the cam groove 479 to allow the adjustment of the center distance R1, in a similar manner to the follower finger 375. In the locked configuration, the clamping screw and the nut 489 are tightened, so that the connecting piece 332 is fixed relative to the base 331. The follower finger 475 thus constitutes the locking means of the amplitude adjustment system.

[0174] For this variant, it can be provided that the actuator 420 comprises a resolver crossed by the clamping screw 393.

[0175] Any feature described above for one of the embodiments or a variant may be implemented for the other embodiments and variants, as far as technically possible.

Claims

1. Shed forming machine (2), for actuating a heddle frame (11) of a weaving loom (1; 101) according to an alternating translational stroke (C11), along a frame axis (Z11), the shedding machine (2) comprising: • a rotary electric actuator (20; 320); • a controller (23) capable of controlling 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 rotated, by the rotary electric actuator (20; 320), around 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 pivotable in oscillation around a lever axis (X50) to actuate said heald frame (11), the lever axis (X50) and the main axis (X20) being parallel;and • a connecting rod (40), which comprises: ◆ a first articulation end (41), via which the connecting rod (40) is coupled to the connecting piece (32; 232; 332) so that the eccentric system (30; 230; 330) and the connecting 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), via which the connecting rod (40) is coupled to the lever (50), so that the lever (50) and the connecting rod (40) are pivotable relative to each other about a connecting rod axis (X42), which is parallel to the main axis (X20), the connecting rod axis (X42) and the eccentric axis (X41) being separated by a connecting rod center distance (R2), • an adjustment system, which comprises locking means (93, 98; 293, 98;393, 394, 98) and which allows: ◆ 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) so that the eccentric center distance (R1) is adjustable, and ◆ a locked configuration, in which the eccentric center distance (R1) is fixed, in that the locking means (93, 98; 293, 98; 393, 394, 98) are configured so that the connecting piece (32; 232; 332) is integral with the base (31; 231; 331) and so that the first articulation end (41) is integral with the second articulation end (42); and • a locking system (80; 180), which allows a locking configuration, where the locking system (80; 180) blocks 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 the lever (50) to pivot. ; characterized in that the shedding machine (2) comprises 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 predetermined maximum eccentric center distance value (6C).

2. A crowd forming machine (2) according to claim 1, wherein the locking system (80) comprises a stop (81, 82; 181), which, to block the pivoting of the lever (50), cooperates mechanically with the lever (50), and, to allow the pivoting of the lever (50), is released from the lever (50).

3. A 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. A shedding machine (2) according to claim 3, wherein: • the connecting piece (32) comprises a crank pin (95), coaxial with the crank shaft (X32), and the base (31) comprises a pinch ring (94) receiving the crank pin (95), the base (31) carrying the connecting piece (32) via the crank pin (95) received in the pinch ring (94), or • the base (231) comprises a crank pin (295), coaxial with the crank shaft (X232), and the connecting piece (232) comprises a pinch ring (294) receiving the crank pin (295), the base (231) carrying the connecting piece (232) via the crank pin (295) received in the pinch ring (294).

5. Shed forming machine (2) according to claim 4, wherein the locking means (93, 98; 293, 98) comprise a clamping screw (93; 293), which: • in the locked configuration of the adjustment system, is in a position for tightening the pinch ring (94; 294) around the crank pin (95; 295), to secure the connecting piece (32; 232) with the base (31; 231), and • in the amplitude adjustment configuration of the adjustment system, is in a position for loosening the pinch ring (94; 294) around the crank pin (95; 295), to allow the pivoting of the connecting piece (32; 232) relative to the base (31; 231), by pivoting the crank pin (95; 295) in the pinch ring (94; 294).

6. A shedding machine (2) according to any one of claims 1 or 2, wherein the base (331) comprises a cam groove (379) defining a spiral around the main axis (X20), and the connecting piece (332) comprises a follower finger (375), which circulates along the cam groove (379) to guide the connecting piece (332) relative to the base (331), when the adjustment system is in the amplitude adjustment configuration and thus vary the eccentric center distance (R1), the eccentric system (330) comprising: • a flange (336), which extends perpendicular to the main axis (X20), which comprises: ◆ positioning means (376) for the follower finger (375) in the cam groove (379), and ◆ an elongated oblong orifice (377) along a translation axis (R332);and • a rod (378), which is coaxial with the main axis (X20) and which is received in the oblong hole (377) to support the flange (336) via the oblong hole (377) and in which: • the locking means (393, 394, 98) comprise 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 integral with the base (331), being axially tightened against the base (331), by screwing the clamping screw (393) into the clamping nut (394), to immobilize the connecting piece (332) along the spiral trajectory relative to the base (331) and thus fix the eccentric center distance (R1);and • in the amplitude adjustment configuration, the movement of the connecting piece (332) relative to the base (331) is authorized, by loosening the clamping screw (393) of the clamping nut (394).; 7. A shedding machine (2) according to any one of the preceding claims, wherein: • the adjustment system further allows a height adjustment configuration, in which the locking means (93, 98; 293, 298; 393, 394, 98) allow movement of the second articulation end (42) relative to the first articulation end (41) so that the connecting rod center distance (R2) is adjustable; and • in the locked configuration, the connecting rod center distance (R2) is fixed.

8. A shedding machine (2) according to claim 7, wherein the connecting rod (40) comprises a first connecting rod end (44), carrying the first articulation end (41), and a second connecting rod end (45), carrying the second articulation end (42), the first connecting rod end (44) and the second connecting rod end (45) being slidably fitted relative to each other along a sliding axis (R40), so that the connecting rod center distance (R2) is adjustable.

9. A shear forming machine (2) according to any one of claims 7 or 8, wherein the adjustment system comprises 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 the case where the adjustment system can be put into the height adjustment configuration.

10. A shedding machine (2) according to any one of the preceding claims, wherein the adjustment system comprises: • 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 the amplitude adjustment configuration.

11. A shedding machine (2) according to any preceding claim, wherein the controller (23) is adapted to control the rotary electric actuator (20) to vary the eccentric center distance (R1) in the amplitude adjustment configuration.

12. A loom (1; 101), comprising the shedding machine (2) according to any preceding claim, and the heddle frame (11) operated by the shedding machine (2).

13. Adjustment method for adjusting the crowd forming machine (2) according to any one of claims 1 to 11, the adjustment method successively comprising: • 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 blocking system is in the release configuration; • a step (b) of placing the blocking system in the blocking configuration; • a step (c) of placing the adjustment system in the amplitude adjustment configuration; and • a step (d1) of adjusting the eccentric center distance (R1) by rotating the eccentric system (30; 230;330) of a predetermined value. wherein the adjustment method comprises a preliminary control step, carried out after step (c) of putting the adjustment system in adjustment configuration and before step (d1) of adjusting the eccentric center distance (R1), the preliminary control step comprising: • a step (c2) of controlling the rotation of the rotary electric actuator (20; 320) in a first direction of rotation until reaching an adjustment stop (38, 39; 238, 239; 339, 375, 46, 47); • a step (c3) of measuring a first angle of rotation 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 first measured rotation angle with a first predetermined angle corresponding to the rotation predictable according to 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.; 14. Adjustment method according to claim 13, wherein, for the adjustment step (d1, d2), the rotational drive of the eccentric system (30; 230; 330) is carried out by a rotational control of the rotary electric actuator (20; 320) according to a target value or incremental value setpoint relating to a desired frame travel or a desired frame height.

15. Adjustment method according to any one of claims 13 to 14, in which, after the amplitude adjustment step (d1), the adjustment method comprises, successively: • a step (e) of placing the adjustment system in the locked configuration; and • a step (f) of placing the blocking system in the release configuration.

16. Adjustment method according to any one of claims 13 to 15, wherein the adjustment method comprises a blocking control step between step (b) of placing the blocking system in the blocking configuration and step (c) of placing the adjustment system in the adjustment configuration, which comprises: • a step (b1) of verifying that the rotary actuator does not rotate under the application of a predetermined torque value, and • a step (b2) of emitting an alarm signaling a blocking fault in the case where a rotational movement of the rotary electric actuator (20; 320) is detected;the adjustment method preferably comprising a locking control step, between step (e) of placing in locked configuration and step (f) of placing in release configuration, which comprises: • a step (e1) of verifying that the rotary electric actuator does not rotate under the application of a predetermined torque value, and • a step (e2) of emitting an alarm signaling a locking fault in the case where a rotational movement of the rotary electric actuator (20; 320) is detected.;

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