Flax sheet feeding machine for a scutching machine

Abstract

The invention relates to a machine (10) for feeding a flax scutching machine with a flax stalk, comprising: - an inlet (E) for receiving a flax stalk, - an outlet (S) for feeding a flax stalk into the inlet of a scutching machine, - a transport device (Dt) configured to transport a flax stalk from the inlet (E) to the outlet (S) along a longitudinal transport direction (X). The machine (10) includes, between the inlet and the outlet, a dynamic alignment device for the flax stalk comprising: - one or more sensors (Ca) configured to determine a position and dimension of the stalk along a transverse direction (Y), and - several movable elements (V1, V2) configured to conform and position the stalk, during its transport, according to a predetermined conformation and position, based on the position and dimension determined by the sensor(s) (Ca). Figure for the abstract: Fig. 2

Description

Title of the invention: LINEN FEEDING MACHINE FOR A SCOTING MACHINE technical field

[0001] The present description relates to a flax slat feeding machine for a scutching machine. Previous technique

[0002] On flax scutching production lines, it is known to feed a scutching machine with flax stalks. For the scutching machine to function as correctly as possible, the flax stalks must be positioned correctly at the inlet of the machine; that is, the flax stems must be parallel to each other and properly positioned relative to the scutching wheel. The operator must therefore intervene to align the stalk against a guide, which generates dust that the operator risks inhaling. Furthermore, incorrect positioning of the flax stalks at the machine's inlet generally leads to problems with the stalks jamming inside the machine and to material losses, which again requires manual intervention by an operator. Such intervention on the machine can cause personal injury.

[0003] In view of the above, it is therefore very important to seek to reduce the manual interventions of operators which are caused by poor positioning of the flax swaths at the inlet of the scutching machines. Description of the invention

[0004] The invention thus relates to a machine for feeding a scutching machine with a flax slat consisting of a plurality of flax stems, the feeding machine comprising: -an entrance designed to hold a linen tablecloth, - an outlet intended to feed a flax slat into an inlet of a scutching machine, - at least one conveying device configured to convey a flax slat from the inlet to the outlet of the machine along a longitudinal conveying direction, characterized in that the machine includes a dynamic alignment device for the flax slat between the inlet and outlet of the machine, the dynamic alignment device comprising: -on the one hand, one or more sensors configured to determine the position and dimensions of the flax slab, along a transverse direction relative to the longitudinal direction of transport and, -on the other hand, several mobile organs configured to conform and position the flax slab, during its transport by said at least one transport device, according to a predetermined conformation and position, depending on the position and dimension determined by the sensor(s).

[0005] Taking into account the position and dimensions determined by the sensor(s) (for example, at the machine inlet), the dynamic flax web alignment device correctly positions the flax web at the machine outlet (and therefore at the scutching machine inlet), giving it the desired shape, in particular the desired width, by applying transverse mechanical pressure to the moving parts on one or both longitudinal edges of the flax web (the moving parts are generally arranged to frame the flax web inside the machine). For example, the flax web exiting the machine can be as narrow and centered as possible. Thanks to the dynamic alignment of the flax web during its transport within the machine, the web, thus aligned at the scutching machine inlet, allows for improved operation of the machine by preventing blockages and thus the need for operator intervention.

[0006] In certain embodiments, the dynamic alignment device comprises at least two movable members that are separated from each other in the transverse direction relative to the longitudinal direction of transport of the flax web between the inlet and outlet of the machine, each movable member being configured to move in the transverse direction. One or both of said at least two movable members are capable of moving transversely on command in order to exert a mechanical pushing force on the flax stems of the web, either at their heads or at their feet depending on the movable member considered, or simultaneously at the heads and feet of the stems by a joint action of the two movable members.

[0007] In certain embodiments, according to a view taken in a (horizontal) plane containing the longitudinal and transverse directions, said at least two moving parts are arranged together so as to adopt a convergent shape from the inlet to the outlet of the machine. This general convergent shape in the top view of the machine is capable of varying over time in order to take into account the predetermined conformation (width of the sheet) and transverse position (relative to the machine outlet) that one wishes to give to the flax sheet at the machine outlet.

[0008] In some embodiments, the dynamic alignment device includes one or more actuators configured to move, on command, each moving part.

[0009] In some embodiments, the actuator(s) are cylinders, for example pneumatic or electric.

[0010] In certain embodiments, each movable part is a leaf or panel. Such a part extends, for example, longitudinally between the inlet and outlet of the machine and is articulated around a vertical axis (perpendicular to the longitudinal and transverse directions) by an end located at the inlet, while the opposite end, located downstream in the machine, is able to move transversely during the articulation / rotation movement.

[0011] In some embodiments, the sensor(s) are arranged at the input of the machine in order to detect as early as possible the initial configuration of the flax slab which will be transported into the machine and whose final configuration at the machine output we want to modify.

[0012] In some embodiments, the sensors are arranged relative to each other so as to form a ramp of sensors aligned along a transverse direction, in particular at the inlet of the machine and arranged above the linen layer.

[0013] The invention also relates to a method of feeding a scutching machine with a flax slat consisting of a plurality of flax stems, the method comprising the following steps carried out in a feeding machine:

[0014] -transport of a flax slab along a longitudinal transport direction,

[0015] -determination of a position and dimension of the flax slab, along a transverse direction relative to the longitudinal transport direction,

[0016] -conformation and positioning of the linen sheet, during its transport in the machine, according to a predetermined conformation and position, depending on the previously determined position and dimension.

[0017] The process described above has the same advantages and characteristics as the machine briefly described above and they will therefore not be repeated here. Brief description of the drawings

[0018] Other features and advantages of the subject matter of this presentation will become apparent from the following description of embodiments, given by way of non-limiting examples, with reference to the attached figures.

[0019] [Fig-1] [Fig.1] is a schematic top-view front perspective schematic representation of a flax feeding machine for a scutching machine according to an embodiment of the invention;

[0020] [Fig.2] [Fig.2] is a schematic top-down rear perspective representation of the feeding machine shown in [Fig.1];

[0021] [Fig.3] The [Fig.3] is a schematic representation of the feeding machine of figures 1 and 2 from a rear view;

[0022] [Fig.4] The [Fig.4] is a schematic representation of certain functional components of the machine involved in the dynamic alignment of the linen sheets;

[0023] [Fig.5] Fig.5 schematically illustrates, in top view, a first possible position of the moving parts of the feeding machine of figures 1 to 3;

[0024] [Fig.6] Fig.6 schematically illustrates, in top view, a second possible position of the moving parts of the feeding machine of figures 1 to 3;

[0025] [Fig. 7] Fig. 7 schematically illustrates, in top view, a third possible position of the moving parts of the feeding machine shown in Figures 1 to 3. Detailed description

[0026] Figures 1 to 6 show a flax scutching machine feeding flax slabs according to an embodiment of the invention. For clarity, the figures are schematic.

[0027] As shown in [Fig. 1], a machine 10 is used to feed flax stalks to a scutching machine (not shown) on a flax scutching production line. The feeding machine 10 is positioned upstream of the scutching machine in the direction of movement of the flax stalks on the production line. [Fig. 1] shows a front view of the machine with an inlet E for the flax stalks, while [Fig. 2] shows a rear view of the machine with an outlet S for the flax stalks. The flax stalks are conveyed into the machine along an axial or longitudinal direction X, aligning the inlet and outlet S, and the stalks arriving at outlet S are intended to be fed into the inlet of the downstream scutching machine (not shown).

[0028] The flax stems are fed into the machine's inlet E, oriented geometrically such that the stem axis is more or less aligned with the machine's transverse axis Y, with, for example, the stem head positioned on the left of the figure and the opposite foot on the right. At the machine's inlet E, the flax stems are arranged in sheets consisting of several layers of flax stems stacked along the vertical axis Z to form a sheet of a certain thickness, for example, between 4 mm and 10 cm, and for example, 6 cm. Furthermore, the stem heads (or feet) are generally not perfectly aligned with each other, which gives the resulting flax sheet a relatively large width with stems oriented at an angle to both the transverse and longitudinal directions X.

[0029] As shown in Figures 1 and 2, the machine comprises a frame 12 on which various equipment or machine components are fixed. The frame 12 comprises, for example, a lower part having two panels that extend axially and form legs 14, 16 spaced transversely apart. The frame 12 also includes a horizontal structure 18 forming a table and resting on the legs 14, 16. The frame 12 further includes an upper part formed by a framework 20, for example, supported by the legs 14, 16 and rising vertically above the table 18. The framework 20 here takes the form of a metal structure composed mainly of vertical and horizontal uprights arranged to form frames on each of the front, rear, and side faces.

[0030] As shown in [Fig. 1], the frame includes on the front face, above the inlet E, a covered extension 22 of the machine forming a safety hood for the operators fixed to the frame 20. The flax stems are introduced into the machine from below this hood.

[0031] Table 18 ([Fig. 2]) includes, for example in its central part which is framed by fixed horizontal supports 18a, 18b spaced transversely apart, a transport device Dt (e.g., a conveyor) configured to transport a sheet of flax from the inlet E to the outlet S of the machine. In this embodiment, the transport device Dt takes the form of several parallel conveyor belts bt1, bt2, bt3 spaced transversely apart. A different number of conveyor belts (e.g., 1, 2, or more than 3) may be used and / or belts with different widths (transverse dimensions). Alternatively, a transport device with a different structure may be used.

[0032] The conveyor belts btl, bt2, bt3 are wound around two front cylinders C1 and rear cylinders C2, each mounted to rotate around a transverse axis a1, a2 (Figs. 1 and 2). One of the two cylinder axes, for example, axis a2 of C2, is driven in rotation by a motor (not shown) which allows the flax web to be transported longitudinally within the machine at a predetermined forward or transport speed. This speed can be varied as needed during the transport of the flax webs. The machine may also include, at the outlet S, opposite cylinder C2 and downstream of it, longitudinal walls forming guides G1 and G2 ([Fig. 2]) which are spaced transversely apart from each other so as to frame and guide laterally the flax web exiting the machine so that it maintains a longitudinal exit direction.

[0033] The frame 20 may also include, on its rear face, a drive wheel R mounted on a frame C suspended from a horizontally arranged bar bl between two vertical uprights M1, M2 which define the rear face of the structure. The wheel R is mounted to rotate freely around a horizontal transverse axis ([Fig. 2]) and the vertical position (height) of the wheel R varies according to the height or thickness of the flax slab exiting S of the machine, as it comes into contact with the slab without, however, slowing its downstream progress. The vertical position (height) of the wheel R can be adjusted The thickness of the flax layer is freely adjustable depending on the thickness of the flax, thanks to a free-moving vertical mounting on the frame C. As the layer thickness increases, the vertical position of the wheel is determined by a position sensor (not shown), and this information, which represents the layer thickness, is transmitted to a central processing unit (CPU) described later. Note that an alternative thickness gauge device can be used. Alternatively, the machine may not include any thickness gauge device.

[0034] In this embodiment, the machine 10 also includes a plurality of sensors. The sensors Ca are arranged relative to each other to form a transversely (horizontally) sensor array RCa at the machine's inlet. More specifically, the sensors are located on the front face of the frame 20, delimited by the vertical uprights M3 and M4, and are mounted on a horizontal cross member Tl extending between these two uprights. The sensors Ca are notably mounted here on a bar b3 fixed to the cross member TL. Other types of sensor mounting on the machine can, of course, be considered.The Ca sensors are regularly spaced along the transverse Y direction so as to extend (and cover) a transverse dimension corresponding to the maximum width of the flax slabs entering the machine, or even greater than this width to ensure coverage of all possible widths. The width of a flax slab is defined by the length of the flax stems in the slab between the foot and the head of the stem. However, at the machine's inlet, since the stems are generally not perfectly aligned with each other, the width of the slab may be extended.

[0035] The RCa sensor array can, for example, include 8 to 10 sensors. The principle is to obtain sufficient information across the entire width of the flax swaths at the machine's inlet E in order to be as precise as possible and to essentially create a map of the incoming flax swath. The Ca sensors are, for example, laser-type measurement sensors (on / off). This RCa sensor array measures the width and transverse position of a flax swath as it enters the machine (at the front face located between the frame's uprights M3 and M4). The width of the swath is determined by a suitable number of sensors, allowing for virtually all possible swath widths. The transverse position is defined, for example, by reference to the width of the machine's inlet opening on the front face.

[0036] Furthermore, the machine 10 comprises several moving parts, for example here two parts VI, V2, which are configured to act jointly on the two opposite longitudinal edges of the flax slab (the two parts frame these two edges) during its longitudinal transport inside the machine, according to the information provided by the sensors at the machine's input, in order to provide At the machine's output, a sheet of flax is correctly aligned to feed the inlet of the scutching machine located downstream without causing subsequent blockages. Using sheet width and sheet position information, the machine manages the position of moving parts (taking into account, in particular, the travel time within the machine).

[0037] To this end, the machine comprises, as schematically represented in [Fig. 4], a central processing unit or computer UC which processes the information from the sensors RCa and adjusts the position of the moving parts VI, V2 according to this information and taking into account the speed of the flax web in the machine (speed from the motor M). The central processing unit UC also processes the position information provided by the position sensor of the drive wheel R in order to regulate the speed of the conveying device according to the thickness of the web detected at the machine outlet and thus to accelerate or decelerate the drive speed relative to a thickness setpoint (the thickness setpoint is given, for example, to avoid causing blockages downstream).It should be noted, however, that the machine can operate without information on the thickness of the sheet at the machine's output (the drive wheel or the thickness gauge device may be absent). In this case, the machine is operated at a fixed speed and the central processing unit (CPU) only takes into account the time it takes the sheet to travel through the machine.

[0038] More particularly, the moving parts are configured to conform and position the flax slab transversely during its transport, according to the transverse position and transverse dimension determined by the input sensors, following a predetermined transverse conformation and transverse position for the flax slab. For example, it is desirable to position the flax slab so that the feet of the flax stems are at a predetermined distance from an edge of the machine, i.e. for example from the guide Gl.

[0039] In the present embodiment, the machine comprises two movable elements VI, V2 extending from upstream to downstream above the table 18 so as to jointly adopt a convergent shape: the movable elements are further apart at their front (upstream) end VI.1, V2.1 than at their rear (downstream) end VI.2, V2.2, thus reducing the width or transverse dimension between the downstream ends VI.2, V2.2 of these elements. Each element VI, V2 is, for example, mounted articulated (rotating) about a respective vertical axis a3, a4 fixed to the front face of the machine frame 20, for example at the vertical uprights M3, M4 and an upper cross member T2 extending between these uprights. Each movable organ VI, V2 is similar to a hinged panel or leaf which, for reasons of weight, is not solid but can take the form of a frame with an opening in its center VI.3, V2.3.Each moving part VI, V2 may include, in . lower part, a deflecting contact zone VI.4, V2.4 which is mounted in the lower part of the respective frame VI.3, V2.3. The deflecting contact zone VI.4, V2.4 is intended to come into contact with the longitudinal edges of the flax layer and in particular with the flax stems (either with the head of the flax stems for zone VI.4, or with the foot for zone V2.4, or with both thanks to the joint actions of zones V1.4, V2.4), in order to exert a transverse thrust constraint on the stems which has the effect of shifting them transversely: either from their head, or from their foot, or from both ends of the stems at the same time.This modification of the transverse position of all the stems, and therefore of the stalk, as it progresses through the machine allows the stalk to be given, firstly, the desired shape by tightening it, particularly along its transverse dimension or width (transverse direction Y), and secondly, the desired position along the transverse direction Y of the machine in order to present it at the inlet of the scutching machine in the desired position. The deflecting contact zone V1.4, V2.4, for example, takes the form of a band wound around two vertical axes, each mounted on the lower edge of the frame V1.3, V2.3, so that each band is mounted freely to rotate around its two axes in order to avoid exerting additional stress (e.g., friction) on the flax stems during lateral contact with them. The lower edge of the two deflecting contact zones V1.4, V2.4.4 is positioned vertically slightly above table 18 so that it can interact with the flax stems without hindering their movement. The movable part VI can be called the head leaf, while the movable part V2 can be called the foot leaf.

[0040] The machine also includes one or more actuators configured to move, on command, each moving part VI, V2, specifically here the downstream end V1.2, V2.2 of these parts transversely (assembly with the longest possible lever arm). The parts can be moved both or only one of them, depending on the information provided by the sensors. When it is necessary to move both parts, they are moved simultaneously.

[0041] As shown in figures 1 to 3, the machine includes two actuators 30, 32 (e.g. pneumatic cylinders; alternatively, they can be electric) mounted on the frame 12 and which allow, according to the commands sent by the central unit UC, to move the corresponding moving part VI, V2 around its respective axis of rotation a3, a4.

[0042] In the present embodiment, the two actuators 30, 32 are mechanically supported on the rear face of the machine (simplified mounting) by the same crossbar b2: one 30 is fixed below the bar to actuate the moving member VI, while the other 32 is fixed above the bar to actuate the moving member V2. An alternative reversed arrangement can be considered. The actuator 30 is fixed at its working or application end 30a, for example, to a support structure SI fixed to a vertical downstream edge of the frame VI, while the actuator 32 is fixed at its working or application end 32a, for example, to a support structure S2 fixed to a vertical downstream edge of the frame V2. It should be noted that other fixing points can alternatively be considered.

[0043] Figures 5 to 7 illustrate, from top views of the machine (views taken in a plane containing the X and Y directions), several examples of possible geometric configurations for opening / closing the moving parts VI and V2 depending on different configurations of flax webs entering the machine. In all these figures, the two moving parts VI and V2 jointly adopt a convergent shape, for example, a V-shape from upstream to downstream with the point of the V directed downstream. Depending on the constraints experienced at the machine's inlet and the objectives imposed at the machine's outlet, the angle of convergence between the two moving parts VI and V2 varies according to the desired width of the web exiting the machine, and the point of the V moves transversely according to the desired transverse position of the outgoing web.

[0044] Thus, in [Fig. 5], the flax web NI has a first configuration at the input, which is detected by the sensors Ca through a measurement of the transverse positioning along the Y direction and the width of the web. In this case, we want, for example, to have at the output S of the machine a flax web whose transverse position is centered with respect to the two lateral edges of the machine (e.g., guide edges G1 and G2) and with a given width L1.To obtain this output configuration, the central processing unit (CPU) commands the two actuators 30 and 32 at time t, appropriately, based on the input configuration of the flax slab detected by the sensors at a previous time t-1. This ensures that the moving parts VI and V2 are oriented (position PI of the two parts) with substantially the same inclination relative to each other (same inclination relative to the longitudinal direction X) and jointly exert a mechanical thrust on the two opposing longitudinal edges B1 and B2 of the flax slab they frame, thus centering the flax slab relative to the machine's output. The time interval t-(t1) depends on the drive speed or feed rate within the machine. In practice, the CPU can control the actuators using an encoder mounted on the axis of the conveying device and thus, for example, actuate them from a given number of encoder points.Furthermore, the spacing between the two downstream ends V1.2 and V2.2, which is obtained by the deployment or retraction of the actuators 30, 32, allows the width of the flax slat to be adjusted to the desired dimension LL. Thus, in the configuration of [Fig.5], the two moving parts VI and V2 will be opened or closed simultaneously to position the slat in the center of the machine.

[0045] In [Fig. 6], the flax slab N2 has a second input configuration which is detected by the sensors Ca through a measurement of the transverse positioning along the Y direction and the width of the slab. In this case, we want, for example, to have at the output S of the machine a flax slab whose transverse position is shifted towards one of the two lateral edges of the machine (e.g., guide edge Gl) and with a given width L2. To obtain this output configuration, the central unit UC controls the two actuators 30, 32 appropriately, according to the input configuration of the slab detected by the sensors, so that the orientation of the moving parts VI and V2 is modified (position P2 of the two parts) relative to that of [Fig. 6].5]: The inclination of the moving member V2 closest to the edge Gl is decreased so that the flax sheet can approach this edge, and the inclination of the moving member VI furthest from the edge Gl is increased in order to shift the flax sheet transversely towards this edge. In addition, the spacing between the two downstream ends VI.2 and V2.2, which is obtained by the deployment or retraction of the actuators 30, 32, allows the width of the flax sheet to be adjusted to the desired dimension L2, which can be equal to L1 or different from L1. Thus, in the configuration of [Fig.6] (head aligner) we will first open or close the movable part V2 (foot leaf) to position the heads of the stems at the limit of the movable part VI (head leaf) and if the length of the flax stems requires it (although the foot leaf V2 is fully open the flax stems remain too long), we will open the head leaf V1 to allow the flax to pass through and thus adapt to the width of the swath.

[0046] In [Fig. 7], the flax slab N3 has a third input configuration which is detected by the sensors Ca through a measurement of the transverse positioning along the Y direction and the width of the slab. In this case, for example, the desired output S of the machine is a flax slab whose transverse position is shifted towards one of the two lateral edges of the machine (here the guide edge G2, at the level of the feet of the flax stems) and with a given width L3.To obtain this output configuration, the central processing unit (CPU) controls the two actuators 30 and 32 appropriately, based on the input configuration of the flax stalk detected by the sensors, so that the orientation of the moving parts VI and V2 is modified (position P3 of the two parts) relative to that shown in Figures 5 and 6: the inclination of the moving part V2 closest to edge Gl (furthest from edge G2) is increased so that the flax stalk can move away from edge Gl and towards edge G2, and the inclination of the moving part VI furthest from edge Gl (closest to edge G2) is decreased in order to shift the flax stalk transversely towards that edge. Furthermore, the spacing between the two downstream ends VI.2 and V2.2, which is obtained by extending or retracting the actuators 30 and 32, allows... to adjust the width of the linen tablecloth to the desired dimension L3 which may be equal to or different from L1 and / or L2.

[0047] The elements described above, namely the sensors Ca and the moving parts VI, V2, together form a dynamic alignment device for the flax web in the machine 10. This device allows the flax web being conveyed through the machine to be aligned in real time according to the state of the flax web detected previously at the machine's inlet E. The alignment occurs almost in real time since the portion of the web, whose transverse position relative to the machine's inlet and width have been measured at a given instant, is then subjected to the mechanical action of the moving parts that frame it at the next instant (corresponding to the time required for the portion of the web to reach the moving parts, taking into account the web's speed of advancement in the machine). The web is thus positioned axially and transversely as desired to feed the scutching machine located downstream without causing a blockage.

[0048] Although the present invention has been described with reference to specific embodiments, it is evident that modifications and changes can be made to these examples without departing from the general scope of the invention as defined by the claims. In particular, individual features of the various embodiments illustrated / mentioned can be combined in additional embodiments. Therefore, the description and drawings should be considered in an illustrative rather than a restrictive sense.

[0049] It is also understood that all the characteristics described with reference to a process are transposable, alone or in combination, to a device, and conversely, all the characteristics described with reference to a device are transposable, alone or in combination, to a process.

Claims

Demands

1. A method for feeding a scutching machine with a flax slat consisting of a plurality of flax stems, characterized in that the method comprises the following steps carried out in a feeding machine (10): -transport of a flax slab along a longitudinal transport direction (X) using at least one transport device (Dt) of the feeding machine, -determination of the position and dimensions of the flax slab, along a transverse direction (Y) relative to the longitudinal transport direction (X) using one or more sensors (Ca), -Conformation of the width of the flax slab along the transverse direction (Y) and positioning of the flax slab, during its transport in the machine, according to a predetermined conformation and position, depending on the position and dimension previously determined with the sensor(s) (Ca).

2. A system comprising a feeding machine (10) for a scutching machine with a flax slat consisting of a plurality of flax stems for carrying out the process according to claim 1 and a scutching machine, the feeding machine (10) comprising: -an opening (E) intended to receive a linen tablecloth, -an output (S) intended to supply an input of a flax scutching machine with a slat of flax, -at least one transport device (Dt) configured to transport a flax web from the inlet (E) to the outlet (S) of the machine along the longitudinal transport direction (X), characterized in that the machine (10) comprises a dynamic alignment device for the flax web between the inlet and outlet of the machine, the dynamic alignment device comprising: -on the one hand, one or more sensors (Ca) configured to determine a position and a dimension of the flax web, along the transverse direction (Y) relative to the longitudinal transport direction (X) and, -on the other hand, several movable parts (VI, V2) configured to conform the width of the flax slab along the transverse direction (Y) and to position the flax slab during its transport by said at least one transport device (Dt), following a predetermined conformation and position, depending on the position and dimension determined by the sensor(s) (Ca).

3. System according to claim 2, wherein the dynamic alignment device comprises at least two movable members (VI, V2) which are separated from each other along the transverse direction relative to the longitudinal transport direction (X) of the flax web between the inlet and outlet of the machine, each movable member (VI, V2) being configured to move along the transverse direction (Y).

4. System according to claim 3, wherein, according to a view taken in a plane containing the longitudinal direction (X) and the transverse direction (Y), said at least two moving parts (VI, V2) are arranged jointly so as to adopt a convergent shape from the inlet to the outlet of the machine.

5. System according to claim 3 or 4, wherein the dynamic alignment device comprises one or more actuators (30, 32) configured to move, on command, one and / or the other of said at least two moving parts.

6. System according to claim 5, wherein the actuator(s) are cylinders (30, 32).

7. System according to any one of claims 3 to 6, wherein each movable member is a leaf (VI, V2).

8. System according to any one of claims 2 to 7, wherein the sensor(s) (Ca) are arranged at the input (E) of the machine.

9. System according to the preceding claim, wherein the sensors (Ca) are arranged relative to each other so as to form a sensor ramp (RCa) arranged along the transverse direction (Y).

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