Patent Publication Number: US-2022217912-A1

Title: Baler connectable to a tractor and method

Description:
TECHNICAL FIELD 
     This invention relates to a baler connectable to a tractor for providing round bales and to a method for producing round bales in a baler connected to a tractor. 
     BACKGROUND ART 
     Balers are configured to produce a bale over a cycle including a first step of picking up crops from a field, feeding them to a baling chamber and rotating them in the baling chamber to form a bale, and a second step, of binding the formed bale with a fastening element (for instance, a net). Traditionally, during the first step the baler moves forward in the field, while during the second step the baler stops for a period of dozens of seconds, until the bale is bound and is therefore discharged from the baler. This stop implies wastes of time and additionally complicates the operations of driving the tractor. 
     Continuous (or non-stop) balers have been developed in order to avoid the stop of the baler for binding the bale, thus saving time and simplifying the operations of driving the tractor to which the baler is connected. 
     For example, patent documents in the name of the patentee EP2736317B1, EP3005854A1, EP3005855B1, EP3058806B1, WO2014001330A3, WO2017017201A1 disclose continuous fixed round balers including a first (smaller) bale forming chamber and a second (bigger) bale forming chamber, wherein the dimension of the first baling chamber as well as the dimension of the second baling chamber is fixed (actually, each bale forming chamber includes a plurality of fixed rolls arranged all around the chamber). 
     Generally speaking, fixed balers have several drawbacks: the internal density of the formed bale is limited by the fact that at the beginning of the forming process, the crops are not compressed inside the chamber. Further, the final dimension of the bale is fixed, thus it is not adaptable according to user&#39;s desires. 
     Furthermore, patent document EP2196082B1 discloses a continuous round baler comprising a pressing chamber and a storage chamber, the storage chamber being arranged upstream of the pressing chamber and having a drivable floor conveyor comprising a plurality of conveying elements; the pressing chamber includes a plurality of pressing rolls having a fixed position around the chamber; the baler further includes a plurality of sensors configured to adjust he speed of one or more conveying elements responsive to an uneven filling of the pressing chamber. In this solution, a high degree of integration of sensors and electronics increases the final cost and reduces the reliability of the machine; moreover, the maximum bale density achievable is limited by the fact that the baling chamber has fixed dimension. Variable round balers have been developed in order to increase the flexibility of the machine and keep the bale compressed over all the duration of the bale&#39;s forming. 
     A continuous baler of variable chamber type is described in patent document WO2013157950A1; according to the solution of this document, the bale reaches its maximum size in a front chamber, afterwards the bale is moved along a substantially horizontal direction towards a back chamber for the binding net to be applied. A similar solution is provided by U.S. Pat. No. 4,009,559A. In these solutions, the horizontal moving of the bale to the back chamber requires high complexity of the transfer means, implying high power consumption and long overall baling cycle time. Moreover, the bale, while being transferred to the back chamber, has reached its maximum dimension but is not still bound with the net; hence, there is the concern to keep the bale under constant pressure to avoid an instantaneous growth. 
     Patent document DE102011109893A1 discloses a continuous agricultural round baler including a semi-variable pressing chamber (delimited by a belt and rollers) and a storage space where the crop is stored before being delivered to the pressing chambers. This baler has as a drawback a huge dimension (especially in a longitudinal direction) resulting in high costs. Another disadvantage is that the material pre-pressed in the storage space expands again after the transfer into the empty pressing chamber and desired bale densities are not achieved. Further, the crops need to travel for a long distance into the storage space (from a feeding rotor up to the pressing chamber), resulting in high energy consumption. 
     Another example of a continuous round baler is provided in patent document EP2220929A1, that discloses a baler configured to bind a formed bale in a rear area of the baler and, in the meantime, feeding the crops picked up from the field to a front area of the baler, until the formed bale is discharged; afterwards, the crops stored in the front area are transferred back to the rear area, and, in the meantime, the feeding mechanism is switched so that the crops picked up from the field are fed to the rear area. This solution has as a drawback the difficulty of filling and emptying the storage means; in fact, the crops that are fed to the storage means tend to form an agglomerate that is difficult to release and feed to the rear area. Also, the bale formation is not uniform, because in a first step two flows of crops are fed to the bale (one from the pick-up device and one from the storage means), and in a second step a single flow of crop (from the pick-up device) is fed to the bale. 
     Hence, there is a need for a continuous baler in which the supply of crops to the bale is uniform and, at the same time, an instantaneous growth of the bale before binding is applied is prevented. 
     An additional issue in variable balers is the positioning of the binding device: while in fixed or in semi-variable balers it is sufficient to insert the binding material between two of the fixed rollers of the baling chamber (like in the fixed baler of the above-mentioned document EP300854A1 or in the semi-variable baler of the above-mentioned document DE102011109893A1), in variable balers it is difficult to find a room for feeding the binding material towards the bale. 
     Another issue in variable and semi-variable balers is that the belt requires a quite complex design in order to create a passage through which the bale can be discharged. In the above-mentioned document DE102011109893A1, the whole belt is lifted in order to discharge the bale; this mechanism requires high strengths to lift the whole belt resulting in high complexity of the machine. 
     Patent document JP2001008525A discloses a round baler including two baling chambers, wherein the crops are fed to the first baling chamber and then the forming bale is transferred to the second baling chamber. The two baling chambers are delimited by two belts. However, the presence of two belts makes the compressing of the bale less effective and the machine control more complex. 
     Other examples of continuous round balers are provided in the following patent documents: DE3415310A1, EP0115608A1, DE102005020777A1, WO9908505A1, EP2196082B1. 
     DISCLOSURE OF THE INVENTION 
     Scope of the present invention is to provide a baler and a method for producing round bales that overcomes at least one of the aforementioned drawbacks. 
     This scope is achieved by the baler and the method for producing round bales in a baler according to the appended claims. 
     For example, the baler is connected (or connectable) to a tractor. Alternatively, the baler could be self-propelled (i.e. equipped with its own engine, connected to driving wheels); in this case, the baler could be equipped with a seat for a driver, or it could be self-propelled (equipped with a system of autonomous driving); for example, baler could be configured according to patent application PCT/IB2020/054872, incorporated herein by reference with regard to the features pertaining self-propelled and autonomous drive features. 
     The method includes a step of picking-up crops from a field, through a pick-up device. The picking-up step is performed while the tractor advances through the field. 
     The method comprises a step of forming a bale in the baling chamber, by rotating the crops received in the baling chamber through a conveying assembly. 
     In an embodiment, the method comprises a step of start a formation of a bale in a first part of the baling chamber. Said step of starting the formation of the bale is performed by advancing the crops along a feeding channel from an inlet of the feeding channel facing the pick-up device to an outlet of the feeding channel. In said step of starting the formation of the bale, the feeding channel has a first orientation so that the outlet of the feeding channel is opened to the first part of the baling chamber. Also, said step of starting the formation of the bale is performed by rotating the crops received in the first part of the baling chamber through a conveying assembly. In an embodiment, the conveying assembly includes a belt. Preferably, the rotating of the crops is also performed through a plurality of starter rollers, arranged at the outlet of the feeding channel. 
     The method comprises a step of binding and discharging a former bale, housed in a second part of the baling chamber. The former bale has been already formed at this stage. Said binding and discharging of the former bale is performed during the starting (partial) formation of the bale in the first part of the baling chamber. 
     The method comprises, after the former bale has been discharged from the second part of the baling chamber, a step of transferring the bale (partially formed in the first part) from the first part to the second part of the baling chamber. During the transferring of the bale from the first part to the second part of the baling chamber, the feeding channel moves until the feeding channel has a second orientation (different from the first orientation) in which the outlet is opened to the second part of the baling chamber. Also, the starter rollers move in synchronized fashion with the feeding channel. 
     Hence, the method includes a step of transferring baling chamber components simultaneously with the transfer of the bale, for continuing to form the bale in a different location, in particular, the method includes a step of transferring the starter rollers from the first position to the second position. Also, the method includes a step of transferring the feeding channel from the first orientation to the second orientation, simultaneously with the transferring of the bale and/or with the transferring of the baling chamber components (e.g. starter rollers). Also, the method includes a step of changing the shape of the belt to continue to form the bale in the second part of the baling chamber. 
     Preferably, the outlet of the feeding channel and the starter rollers move along a substantially circular trajectory. The bale itself, during transferring, follows a substantially circular trajectory; in particular, the bale follows a substantially circular trajectory from a higher position to a lower position; in an embodiment, said substantially circular direction is defined about an axis passing through a pushing rotor configured to push the crops along the feeding channel. Hence, the bale travels along an arc of circumference. 
     The method comprises a step of completing the formation of the bale in the second part of the baling chamber (after it has been transferred from the first part to the second part). The step of completing the formation of the bale is performed by advancing the crops along the feeding channel, from the inlet to the outlet, and by rotating the crops received in the second part of the baling chamber through the conveying assembly. During the step of completing the formation of the bale the feeding channel has its second orientation, so that the outlet is opened to the second part of the baling chamber. Preferably, the rotating of the bale is also performed through the plurality of starter rollers, arranged at the outlet of the feeding channel. 
     Hence, the bale formation is performed firstly in the first part of the baling chamber, then during the transferring from the first part to the second part, then it is completed in the second part. This solution provides a non-stop bale which allows to form a uniform bale, by constantly feeding the crops during the formation of the bale and, also to prevent instantaneous expansions of the bale and to ease the transferring. 
     Preferably, during the transferring of the bale from the first part to the second part of the baling chamber, the outlet of the channel and the starter rollers keep in contact with the bale. Also, the starter rollers continuously cooperate with the conveying assembly to rotate the bale during the transferring. 
     Hence, the bale constantly rotates during transferring. 
     Preferably, during the transferring of the bale from the first part to the second part of the baling chamber, the feeding channel continuously feeds the crops to the bale while the conveying assembly transfers the bale from the first part to the second part. Hence, the bale constantly grows during the transferring. 
     In an embodiment, the method comprises a step of binding the bale with a fastening element. 
     In an embodiment, after the bale is completely formed in the second part of the baling chamber, the feeding channel is moved back to its first orientation to start to form a new bale in the first part of the baling chamber. While the new bale starts to be formed in the first part, the formed bale housed in the second part of the baling chamber is bound with a fastening element. Then, while the new bale continues to grow in the first part, the formed bale is discharged, hence clearing the second part. Once the second part has been cleared by discharging the formed bale, the new bale is transferred from the first part to the second part, and so on. Also, together with the transferring of the bale, the feeding channel is moved from its first orientation to its second orientation, the starter rollers are moved from their first position to their second position, and the belt is manipulated to change its shape for continuing to form the bale in said second part of the baling chamber. 
     Hence, the method provides a non-stop baling process characterized by a good uniformity of crops distribution and a good average pressure in the formed bale. Also, the transferring of the bale is particularly easy. 
     In an embodiment, in the step of binding, the binder guides the fastening element into the baling chamber along an upwardly trajectory from a first height to a second height, wherein the first height is lower than the second height with respect to a ground surface on which the baler rests. Preferably, the upwardly trajectory is substantially vertical (parallel and directed opposite to the weight force). 
     In an embodiment, the binder is attached to the frame of the baler. In an embodiment, the binder is attached to the wheel axle. 
     This positioning of the binder makes the access to the fastening element reservoir roll more comfortable; in fact, the user may easily slide out a finished roll and slide in a new roll, without any need for raising heavy rolls. 
     Also, thanks to the positioning of the binder under de baler, it is possible to feed the fastening element to the bale through a passage defined between a starter roller and a portion of the frame, avoiding to interrupt the belt elsewhere. 
     In an embodiment, the binder includes a binding structure. The binding structure is tube-shaped. The binding structure includes a cylindrical wall. The binding structure encloses a fastening element reservoir. The binding structure has an aperture for releasing the fastening element; the aperture is realized in the cylindrical wall, elongated along an axis of the cylindrical wall. 
     In an embodiment, the binding step includes a rotation of the binding structure about a rotation axis, from a rest position to a working position. 
     In an embodiment, the binding step includes an advancement of the duckbill towards the baling chamber. Said rotation of the binding structure is synchronized with said advancement of the duckbill. 
     In an embodiment, the binding step includes a rotation of a linkage bar about a pivoting axis, to move the duckbill along a predetermined path, towards the baling chamber. In an embodiment, the linkage bar rotates in synchronized fashion with the rotation of the binding structure. 
     In an embodiment, the advancement of the duckbill is performed by said rotation of a linkage bar about the pivoting axis. Preferably, the linkage bar has a first end, defining the pivoting axis, and a second end, supporting the duckbill. Preferably, the pivoting axis is spaced apart from the binding structure. 
     In an embodiment, the binder includes a knife attached to the binding structure. In an embodiment, the knife is oriented tangentially with respect to the cylindric wall of the binding structure. Upon rotating the binding structure from the working position to the rest position, the knife intercepts the fastening element, to cut the fastening element. 
     In an embodiment, the binding step includes, after cutting the fastening element, a return step, including a rotation of the binding structure from the working position to the rest position. 
     In an embodiment, in the binding step the binding structure rotates in a positive rotation direction, and in the return step the binding structure rotates in a negative rotation direction, opposite to the positive rotation direction. 
     In an embodiment, from a point of view on a left-hand side of the baler (with the tongue connectable to the tractor on the left and the tailgate on the right), the positive rotation direction is anticlockwise and the negative rotation direction is clockwise. 
     In an embodiment, the rotation of the linkage bar about the pivoting axis is synchronized with a rotation of the binding structure about the rotation axis. 
     In an embodiment, an actuator performs both said pivoting of the linkage bar and said rotation of the binding structure. In an embodiment, the actuator performs the pivoting of the linkage bar, and the pivoting of the linkage bar drags the rotation of the binding structure. 
     The present description also regards a baler. The baler is connectable to a tractor. The baler is configured for providing round bales. 
     The baler comprises a frame. The frame is supported on a wheel axle. 
     The frame (or the baler) includes a baling chamber, configured for receiving crops for forming a bale. The baling chamber includes a first part, for housing a first amount of crops, and a second part, for (simultaneously) housing a second amount of crops. The term “amount of crops” means, within the present description, a partially formed bale (during its formation process), or a formed bale (after its formation process). In an embodiment, the first part is configured for starting a formation of the bale, the second part is configured for complete the formation of the bale. 
     In another embodiment, the baling chamber includes a single chamber, for receiving the crops and forming the bale. 
     The baler comprises a conveying assembly. The conveying assembly is configured for imparting a first rotating movement to the first amount of crops, and, at the same time, a second rotating movement to the second amount of crops. 
     The baler comprises a pick-up device. The pick-up device is configured for picking-up the crops from a field. 
     The baler comprises a feeding system. The feeding system is configured to feed the crops from the pick-up device to the baling chamber. 
     The feeding system includes a feeding channel. The feeding channel is traversed by the crops being fed to the baling chamber. The feeding channel has an inlet, for receiving the crops from the pick-up device, and an outlet, opened to the baling chamber for feeding the crops to the baling chamber. 
     The feeding system is movable (or switchable) between a first configuration and a second configuration. In the first configuration of the feeding system, the feeding channel has a first orientation. The feeding channel, in its first orientation, has the outlet opened to the first part of the baling chamber. In the second configuration of the feeding system, the feeding channel has a second orientation. The second orientation is different from the first orientation. The feeding channel, in its second orientation, has the outlet opened to the second part of the baling chamber. In both the first orientation and the second orientation, the inlet of the feeding channel faces the pick-up device. 
     The feeding channel is configured to selectively feed the crops to the first part of the baling chamber or to the second part of the baling chamber. 
     Hence, the feeding system in its first configuration is configured to feed the crops picked up by the pick-up device to the first part of the baling chamber; the feeding system in its second configuration is configured to feed the crops picked up by the pick-up device to the second part of the baling chamber. 
     In an embodiment, the feeding system further includes a plurality of starter rollers. The starter rollers of said plurality are arranged at the outlet of the feeding channel. Preferably, a first part of said plurality of starter rollers is arranged at a lower side of the outlet of the feeding channel, and a second part of said plurality of starter rollers is arranged at an upper side of the outlet of the feeding channel. The starter rollers of said plurality are configured to cooperate with the conveying assembly to impart the rotating movement to the crops. Specifically, when the feeding system is in its first configuration, the starter rollers cooperate with the conveying assembly to impart the first rotating movement to the first amount of crops, and, when the feeding system is in its second configuration, the starter rollers cooperate with the conveying assembly to impart the second rotating movement to the second amount of crops. 
     In an embodiment, the starter rollers of said plurality are configured to cooperate with the feeding channel to feed the crops into the baling chamber. Specifically, when the feeding system is in its first configuration, the starter rollers are configured to cooperate with the feeding channel to feed the crops to the first part of the baling chamber; when the feeding system is in its second configuration, the starter rollers are configured to cooperate with the feeding channel to feed the crops to the second part of the baling chamber. 
     In an embodiment, the starter rollers of said plurality being movable in synchronized fashion with the feeding channel between a first position and a second position. In the first position, the starter rollers (at least partially) delimit the first part of the baling chamber to rotate the first amount of crops. In the second position, the starter rollers (at least partially) delimit the second part of the baling chamber to rotate the second amount of crops. In the first configuration of the feeding system, the starter rollers of said plurality are in the first position. In the second configuration of the feeding system, the starter rollers of said plurality are in the second position. 
     So, when the bale (or amount of crops) has reached a certain dimension in the first part and is moved to the second part, the feeding channel is moved in the second position in order to keep feeding the crops to the bale. This allows to never stop the advancing of the crops through the feeding channel, during the formation of the bale. 
     In an embodiment, the outlet of the feeding channel defines in the baling chamber an opening through which the crops are fed to the baling chamber. 
     The starter rollers of said plurality delimit said opening. The opening is movable in synchronized fashion with the feeding channel and with the starter rollers, so that, in the first configuration of the feeding channel, the opening is defined in the first part of the baling chamber and, in the second configuration of the feeding channel, the opening is defined in the second part of the baling chamber. 
     The conveying assembly is configured to transfer the first amount of crops from the first part of the baling chamber to the second part of the baling chamber. The conveying assembly is configured to move in synchronized fashion with the feeding system to transfer the first amount of crops from the first part to the second part simultaneously with the movement of the feeding channel from the first orientation to the second orientation. 
     The plurality of starter rollers is configured to keep in contact with the first amount of crops while the conveying assembly transfers the first amount of crops from the first part of the baling chamber to the second part of the baling chamber. 
     The feeding channel is configured to continuously feed the crops to the baling chamber (to grow the first amount of crops being transferred) while the conveying assembly transfers the first amount of crops from the first part of the baling chamber to the second part of the baling chamber. 
     In an embodiment, the conveying assembly includes a belt. Hence, in an embodiment, the baler is a variable-chamber baler. In an embodiment, the conveying assembly includes a single belt. In an embodiment, the conveying assembly includes two or more belts. 
     In an embodiment, the belt partially delimits the baling chamber. In an embodiment, the belt partially delimits both the first part and the second part of the baling chamber. The belt is configured to impart the first rotating movement to the first amount of crops housed in the first part and a second rotating movement to the second amount of crops. 
     In an embodiment, the conveying assembly includes a plurality of belt rollers, supporting and rotating the belt. 
     In an embodiment, in the first configuration of the feeding system, the starter rollers cooperate with the belt to delimit the first part of the baling chamber, and, in the second configuration of the feeding system, the starter rollers cooperate with the belt to delimit the second part of the baling chamber. 
     In an embodiment, the conveying assembly includes one or more arms. Said one or more arms are configured to move the belt rollers (or a group thereof). 
     At least some belt rollers of said plurality of belt rollers are movable, in synchronized fashion with the feeding system, through said one or more arms, to move the belt. 
     In an embodiment, the conveying assembly (or said one or more arms) includes a guide arm. The plurality of belt rollers includes a guide arm roller mounted on the guide arm (at an extremity thereof). The guide arm is movable between a raised position, in which the guide arm roller is spaced apart from the belt, and a lowered position, in which the guide arm roller contacts the belt. When the feeding system is in the first configuration, the guide arm is in the lowered position (to keep the belt stretched on the first part of the baling chamber). When the feeding system is in the second configuration, the guide arm is in the raised position. Specifically, when the feeding system starts to switch from the first configuration to the second configuration, the guide arm raises up to let the bale moving to the second part. 
     In an embodiment, the conveying assembly (or said one or more arms) includes a rotating arm. The plurality of belt rollers includes a rotating arm roller, mounted on the rotating arm (at an extremity thereof). The rotating arm is rotatable about a respective axis between a rest position in which the rotating arm roller is spaced apart from the belt, and a working position in which the rotating arm roller contacts the belt. When the feeding system is in the first configuration, the rotating arm is in the rest position. Also, when the feeding system is in the second configuration, the rotating arm is in the rest position. During the moving of the feeding system from the first configuration to the second configuration (hence, during the transferring of the bale or amount of crops), the rotating arm is in the working position, in order to control and guide the belt close to the bale&#39;s circumference during the transfer of the bale or amount of crops (in order to keep the bale compressed). 
     In another embodiment, the conveying assembly includes a plurality of fixed rollers, configured to rotate the crops. In particular, in this embodiment, a first group of the fixed rollers partially delimits the first part of the baling chamber and a second group of the fixed rollers partially delimits the second part of the baling chamber. Hence, in an embodiment, the baler is a fixed-chamber baler. 
     Preferably, the second part of the baling chamber is provided in a rear area of the baling chamber; the first part of the baling chamber is provided in a front area of the baling chamber. The front area is interposed between the tractor and the rear area. 
     In an embodiment, the feeding system includes a starter rollers structure supporting the starter rollers. The starter rollers are rotatably mounted on the starter rollers structure. The starter rollers structure is rotatable about a respective rotation axis to move the starter rollers between the first position and the second position. So, the starter rollers are movable along a circular trajectory. 
     When the feeding system moves from the first configuration to the second configuration, the starter roller structure rotates in a clockwise direction (defined by seeing the baler in a lateral view with the tractor on the left). Hence, the feeding channel rotates in the clockwise direction, from its first orientation to its second orientation. Similarly, the partially formed bale rotates in the clockwise direction. 
     When the feeding system moves from the second configuration to the first configuration, the starter roller structure rotates in an anticlockwise direction (defined by seeing the baler in a lateral view with the tractor on the left). 
     In an embodiment, the feeding system includes a pushing rotor. The pushing rotor is configured to advance the crops along the feeding channel (towards the outlet). The pushing rotor is rotatable about a respective rotation axis to advance the crops. In an embodiment, the rotation axis of the starter rollers structure is superposed (hence, coincides) with the rotation axis of the pushing rotor. However, while the pushing rotor continuously rotates to advance the crops, the starter roller structure only rotates to switch the feeding system from the first configuration to the second configuration, and vice versa. 
     In an embodiment, the feeding system includes a rotatable wall. Preferably, the rotatable wall is arranged at a lower side of the feeding channel. The rotatable wall is rotatable to move between a rest position and a working position. Preferably, the rotatable wall is rotatable about a rotation axis parallel to a direction of development of the starter rollers. In the rest position, the rotatable wall extends out of the feeding channel (being in its second position). In the working position, the rotatable wall is elongated along the feeding channel to partially delimit the feeding channel (being in its first position). In particular, the rotatable wall in the working position defines a lower portion of the feeding channel. This rotatable wall allows the feeding channel to vary its length, accordingly to the configuration: in the first configuration of the feeding system, the channel has a greater length, and, in the second configuration of the feeding system, the channel has a smaller length. 
     In an embodiment, the baler comprises a binding unit, configured to bind the bale with a fastening element. In an embodiment, the binding unit is configured to feed the fastening element to the second part of the baling chamber. So, while a formed bale is in the second part for being bind, a new bale may start its formation in the first part. 
     In an embodiment, the baler comprises a bottom roller. In an embodiment, the bottom roller is fixed to the frame. 
     In an embodiment, the binding unit is configured to feed the fastening element to the second part of the baling chamber through a passage defined between a starter roller of said plurality of starter rollers and the bottom roller. 
     In an embodiment, the binder is located at a lower height than the baling chamber, with respect to a ground surface on which the baler rests, and is configured for guiding the fastening element into the baling chamber along an upwardly trajectory. 
     In an embodiment (wherein the baling chamber includes a first part and a second part) the binder is located below the second part, preferably the binder is interposed between the second part and the ground surface. 
     In an embodiment, the binder is located between the feeding system and the wheel axle, along a horizontal direction parallel to the ground surface. 
     In an embodiment, the binder includes a binding structure. The binding structure is tube-shaped. The binding structure encloses a fastening element reservoir and has an aperture for releasing the fastening element. The aperture is elongated along the direction of development of the tube-shaped binding structure. 
     In an embodiment, the binder includes a duckbill. The duckbill is configured to pull the fastening element out of the aperture and guide it to the baling chamber. 
     In an embodiment, the binding structure is rotatable, about a rotation axis, between a rest position and a working position. In the rest position of the binding structure, the aperture is in a first position and, in the working position of the binding structure, the aperture is in a second position for feeding the fastening element to the baling chamber. 
     In an embodiment, the binder includes a knife. The knife is attached to the binding structure and is configured to intercept and cut the fastening element upon rotating the binding structure from the working position to the rest position. 
     In an embodiment, the binder includes a linkage bar. Preferably, the binder includes a pair of linkage bars, at opposite ends of the tube-shaped binding structure. The linkage bar is pivotable (or rotatable) about a pivoting axis to move the duckbill along a predetermined path towards the baling chamber. Preferably, the linkage bar is pivotable in synchronized fashion with the binding structure. 
     Preferably, the linkage bar is arc shaped between a first end and a second end. The pivoting axis is located at the first end. The duckbill is attached to the second end. 
     In an embodiment, the binder is driven by an actuator, configured to simultaneously actuate both a pivoting of the linkage bar about the pivoting axis and a rotation of the binding structure between the rest position and the working position. 
     In an embodiment, the actuator is configured to performs a pivoting of the linkage bar. The linkage bar pivoting is connected to the binding structure so that the linkage bar pivoting drags a rotation of the binding structure. In an embodiment, the connection between the linkage bar and the binding structure may be provided by the fastening element itself, which is enclosed into the binding structure and has a free end attached to the duckbill. In another embodiment, the linkage bar may be connected to the binding structure through a connector. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       This and other features of the invention will become more apparent from the following detailed description of a preferred, non-limiting example embodiment of it, with reference to the accompanying drawings, in which: 
         FIG. 1  illustrates a baler according to the present description, while starting to form a former bale in a second part of the baling chamber, by a feeding system being in a second configuration; 
         FIG. 2  illustrates the baler of  FIG. 1 , while starting to bind the former bale housed in the second part of the baling chamber, the feeding system still being in the second configuration; 
         FIG. 3  illustrates the baler of  FIG. 1 , while binding the former bale housed in the second part of the baling chamber and moving the feeding system from the second configuration to the first configuration; 
         FIGS. 4, 5 and 6  illustrate the baler of  FIG. 1 , while starting to form a bale in the first part of the baling chamber, by the feeding system being in the first configuration; 
         FIG. 7  illustrates the baler of  FIG. 1 , while continuing to form the bale in the first part of the baling chamber and discharging the former bale; 
         FIG. 8  illustrates the baler of  FIG. 1 , while transferring the bale from the first part of the baling chamber to the second part of the baling chamber, and simultaneously moving the feeding system from the first configuration to the second configuration; 
         FIG. 9  illustrates the baler of  FIG. 1 , while continuing forming the bale in the second part of the baling chamber, by the feeding system being in the second configuration; 
         FIG. 10  illustrates a binder of the baler of  FIG. 1  in a rest position; 
         FIG. 11  illustrates the binder of  FIG. 8  in a working position. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION 
     With reference to the accompanying drawings, the numeral  1  denotes a baler, according to the present disclosure. 
     The baler  1  includes a tongue  10  connectable to a tractor. The tongue  10  is configured to allow the tractor to tow the baler  1 . 
     The baler  1  comprises a drive shaft. The drive shaft, in an embodiment, is a cardan shaft. The baler  1  includes a gearbox  101 . The drive shaft is configured to transmit mechanical rotation from a motor of the tractor to the baler  1 , through the gearbox  101 . 
     The baler  1  comprises a frame  100  including a baling chamber  2 . The frame  100  surrounds the baling chamber  2 . The baling chamber includes a first part  21  and a second part  22 . The baling chamber  2  is configured for receiving crops to form a bale B. 
     The baler  1  comprises a wheel axle  23 ; the frame  100  is supported on the wheel axle  23 . 
     The baler  1  comprises a conveying assembly  3 . The conveying assembly  3  includes a belt  300 . 
     The conveying assembly  3  includes a tensioner  301  and a plurality of tensioner rollers  302  mounted on the tensioner  301 . The tensioner rollers  302  are configured to support the belt  300 . The belt  300  is wrapped around the tensioner rollers  302 . In an embodiment, the tensioner rollers  302  are idle. Hence, the movement of belt  300  makes the tensioner rollers  302  rotate. The conveying assembly  3  includes a tensioner actuator  3011 . In an embodiment, the tensioner actuator  3011  is a cylinder-piston actuator. The tensioner actuator  3011  has a first end (pivotably) connected to the frame  100  and a second end (pivotably) connected the tensioner  301 . Hence, the tensioner  301 , actuated by the tensioner actuator  3011 , is configured to manipulate the belt  300 . 
     The conveying assembly  3  includes a plurality of driven rollers  303 . In an embodiment, the driven rollers  303  are mounted on the frame  100 . The belt  300  is wrapped around said driven rollers  303 . The driven rollers  303  transmit mechanical movement to the belt  300 . 
     The baler  1  comprises a tailgate  7 . The tailgate  7  is connected to the frame  100 . The tailgate  7  is movable between a closed position and an open position. The tailgate  7  in the open position is configured for discharging a formed and bound bale. 
     The baler  1  comprises a tailgate actuator  701 . The tailgate actuator  701  in an embodiment is a cylinder-piston actuator. The tailgate actuator  701  has a first end connected to the frame  100  and a second end connected to the tailgate  7 . The tailgate actuator  701  is configured to move the tailgate  7  between the closed position and the open position. 
     The conveying assembly  3  includes a rotating arm  304 . The rotating arm  304  is rotatable about a pivot  702 . In an embodiment, said pivot  702  is provided on the tailgate  7 ; said pivot  702  is movable integrally with the tailgate  7 . The conveying assembly  3  includes a rotating arm actuator  3041 . The rotating arm actuator  3041 , in an embodiment, is a cylinder-piston actuator. The rotating arm actuator  3041  has a first end (pivotably) connected to the tailgate  7  and a second end (pivotably) connected to the rotating arm  304 . The rotating arm is rotatable about the pivot  702  between a rest position and a working position. The rotating arm actuator  3041  is configured to move the rotating arm  304  between the rest position and the working position. The conveying assembly  3  includes a rotating arm roller  305 . The rotating arm roller  305  is mounted on the rotating arm  304 , preferably at an extremity thereof. In an embodiment, the rotating arm roller  305  is idle. When the rotating arm  304  is in the rest position, the rotating arm roller  305  is positioned along a back wall of the tailgate  7  and does not interfere with the belt  300 ; when the rotating arm  304  is in the working position, the rotating arm roller  305  contacts and stretches the belt  300 . 
     The conveying assembly  3  includes a plurality of tailgate rollers  306 ,  306 ′,  306 ″, connected to (or mounted on) the tailgate  7 . Said tailgate rollers  306 ,  306 ′,  306 ″ are idle. The belt  300  is wrapped around said tailgate rollers  306 ,  306 ′,  306 ″ and is stretched by them. 
     The conveying assembly  3  includes a guide arm  309 . The conveying assembly  3  includes a guide arm roller  310 . The guide arm roller  310  is connected to the guide arm  309 , preferably at an extremity thereof. The guide arm  309  is movable between a raised position, in which the guide arm roller  310  is spaced apart from the belt  300 , and a lowered position, in which the guide arm roller  310  contacts the belt  300  (to stretch it). 
     The conveying assembly  3  includes a plurality of frame  100  rollers  307  connected to the frame  100  and configured to stretch and manipulate the belt  300 . 
     The conveying assembly  3  includes a further roller  308  configured to stretch and manipulate the belt  300 . 
     Said tensioner rollers  302 , driven rollers  303 , rotating arm roller  305 , tailgate rollers  306 ,  306 ′,  306 ″, guide arm roller  310 , roller  308  attached to the feeding structure form a plurality of belt rollers, configured to support, stretch and manipulate the belt  300 . 
     The baler  1  comprises a pick-up device  5 . The pick-up device is configured for picking up the crops from a field. The pick-up device  5  includes a pick-up roll  51 . 
     The baler  1  comprises a feeding system  4 . The feeding system  4  is configured to guide the crops from the pick-up device  5  to the baling chamber  2 . The feeding system  4  includes a pushing rotor  401 , rotatable about a rotation axis  401 A. The feeding system  4  includes a feeding channel  402 . The feeding channel  402  extends between an inlet  402 A and an outlet  402 B. The inlet  402 A faces the pick-up device  5 . The outlet  402 B defines an opening in the baling chamber  2 . The pushing rotor  401  is positioned along the feeding channel  402 , downstream of the inlet  402 A and upstream of the outlet  402 B. The inlet  402 A is at a lower level with respect to the outlet  402 B; the pushing rotor  401 , by rotating about its axis  401 A, pushes the crops up from the inlet  402 A to the outlet  402 B. 
     The feeding system  4  includes a drop floor device  403 , defining a (portion of) bottom side of the feeding channel  402 . The drop floor device  403  is positioned between the inlet  402 A and the outlet  402 B of the feeding channel  402 . The pushing rotor  401  is positioned above said drop floor device  403 . The feeding system  4  includes a plurality of starter rollers  404 ,  404 ′,  404 ″. 
     The starter rollers  404 ,  404 ′,  404 ″ are driven rollers. Said plurality of starter rollers includes at least a starter roller  404  positioned at a bottom side of the feeding channel  402  and at least a starter roller  404 ′,  404 ″ positioned at a top side of the feeding channel  402 . 
     In an embodiment, a (or at least one) starter roller  404 ″ of said plurality is configured to rotate the bale B when the feeding system  4  is in its second configuration and to drive the belt  300  when the feeding system  4  is in its first configuration. 
     The plurality of starter rollers  404 ,  404 ′,  404 ″ is mounted on a starter roller structure  4043 . The starter roller structure  4043  is rotatable about an axis which preferably coincides with the axis  401 A of rotation of the pushing rotor  401 . 
     The frame  100  defines a starter roller guide  4041  along which a periphery of the starter roller structure  4043  moves. 
     The feeding system  4  includes a starter roller actuator  4042  configured to actuate the rotation of the starter roller structure  4043 . In an embodiment, the starter roller actuator  4042  is a cylinder piston actuator; the starter roller actuator  4042  has a first end (pivotably) connected to the frame  100  and a second end (pivotably) connected to the starter roller structure  4043 . 
     The roller  308  configured to manipulate the belt is mounted (attached) to the starter roller actuator  4042 . 
     The feeding system  4  includes a rotatable wall  405 . The rotatable wall  405  is rotatable about a respective axis between a working position, in which it defines a portion of the bottom side of the feeding channel  402 , and a rest position, in which it is spaced apart from the feeding channel  402 . 
     The feeding system  4  is movable between a first configuration and a second configuration. 
     In the first configuration of the feeding system  4 , the feeding channel  402  has a first orientation, so that the outlet  402 B is opened towards the first part  21  of the baling chamber  2 . 
     In the first configuration of the feeding system  4 , the starter rollers  404 ,  404 ′,  404 ″ delimit the first part  21  of the baling chamber  2 , to rotate crops housed therein. 
     In the second configuration of the feeding system  4 , the feeding channel  402  has a second orientation, so that the outlet  402 B is opened towards the second part  22  of the baling chamber  2 . 
     In the second configuration of the feeding system  4 , the starter rollers  404 ,  404 ′,  404 ″ delimit the second part  22  of the baling chamber  2 , to rotate crops housed therein. 
     The feeding system  4  is movable from the first configuration to the second configuration (and vice versa) upon rotation of the starter roller structure  4043  about its rotation axis and, preferably, upon rotation of the rotatable wall  405  from its working position to its rest position (and vice versa). 
       FIGS. 3, 4, 5, 6 and 7  provides examples of the feeding system  4  being in the first configuration.  FIGS. 1, 2 and 9  provides examples of the feeding system  4  being in the second configuration.  FIG. 8  provides an example of the feeding system  4  moving from the first configuration to the second configuration. 
     The conveying assembly  3  is movable together (in synchronized fashion) with the feeding system  4 . 
     In particular, when the feeding system  4  is in its first configuration, the guide arm  309  is in its lowered position; in this position, the guide arm roller  310  stretches the belt  300  around the crops contained in the first part  21 . When the feeding system  4  is in its second configuration, the guide arm  309  is in its raised position. 
     When the feeding system  4  is in its first configuration, or in its second configuration, the rotating arm  304  is in its rest position. When the feeding system  4  is moving from the first configuration to the second configuration, the rotating arm  304  is activated (thus is in its working position), to allow a guided transfer of the crops from the first part to the second part. 
     The baler  1  comprises a binder  6 . The binder  6  is configured to bind a formed bale B with a fastening element  60 . The fastening element  60  may be, for example, a net or a plastic film. 
     The binder  6  includes a fastening element reservoir  600 . The fastening element reservoir  600  includes a roll  61  and an amount of fastening element  60 , wrapped on the roll  61 . 
     The binder  6  (and/or the fastening element reservoir  600 ) is positioned under the baling chamber  2 ; in particular, the binder  6  is positioned under the second part  22  of the baling chamber  2 . 
     The baler  1  lays on a ground surface G. The ground surface G is defined by the field from which the crops are picked up. 
     The binder  6  is positioned between the ground surface G and the baling chamber  2  (in particular, the second part  22  of the baling chamber  2 ). 
     The binder  6  is configured for guiding the fastening element  60  into the baling chamber  2  along an upwardly trajectory. The upwardly trajectory is substantially elongated along a vertical direction V, or has at least a vertical component. 
     The binder  6  is located between the feeding system  4  and the wheel axle  23 , along a horizontal direction H parallel to the ground surface G. 
     The baler  1  includes a bottom roll  609  connected to the frame  100 . 
     The bottom roll  609  is preferably driven. The bottom roll  609  is configured to receive the fastening element  60  from the binder  6  and to guide it towards the bale B. The bottom roll  609  has a rough surface, in order to grasp the fastening element  60 . Preferably, the bottom roll  609  is larger than the bale B, in order to guide the fastening element  60  over the edges of the bale B. 
     The binder  6  is configured to insert the fastening element into the (second part  22  of) baling chamber  2  through a passage defined between the bottom roll  609  and one of the starter rollers (in particular, the starter roller  404 , positioned on a bottom side of the feeding channel  402 ). 
     The binder  6  includes a binding structure  601 . The binding structure  601  includes a tube surrounding the fastening element reservoir  600 . 
     The binding structure  601  has (or defines) an aperture  601 B for releasing the fastening element  60  when it is unrolled from the reservoir  600 . 
     The binder  6  includes a duckbill  602 , configured to pull the fastening element  60  out of the aperture  601 B and feed it to the baling chamber  2 . 
     The binder  6  includes a linkage bar  604 . The linkage bar  604  is pivotable about a pivoting axis  604 A. The duckbill  602  is connected to the linkage bar  604 . Hence, the linkage bar  604 , by pivoting (or rotating) about the pivoting axis  604 A, guides the duckbill  602  along a predetermined path towards the baling chamber  2  (or the second part  22  thereof, or towards the bottom roller  609 ). Said predetermined path of the duckbill  602  towards the baling chamber  2  is directed upwards. 
     In an embodiment, the linkage bar  604  is arc-shaped. The linkage bar  604  has a first end and a second end, opposite to the first end. The pivoting axis  604 A is at the first end of the linkage bar  604 . The duckbill  602  is attached to the second end of the linkage bar  604 . 
     Preferably, the binder includes two linkage bars  604 , one at a first side of the baler  1  and one at a second side of the baler  1 . 
     The linkage bar  604  includes a linkage bar roller  605  positioned between the first end and the second end. The linkage bar roller  605  is idle. The linkage bar roller  605  is configured to guide the fastening element  60  out of the aperture  601 B, towards the duckbill  602 . 
     The binding structure  601  includes a binder guide roller  607 . The binder guide roller  607  is idle. The binder guide roller  607  is positioned at the aperture  601 B of the binding structure  601 . The binder guide roller  607  is configured to guide the fastening element  60  from the reservoir  600  to the linkage bar roller  605 . 
     The binding structure  601  is rotatable about a rotation axis  601 A. In an embodiment, the rotation axis  601 A is a central axis of the binding structure  601 . The rotation axis  601 A of the binding structure  601  is spaced apart from the rotation axis  604 A of the linkage bar  604 . The rotation axis  601 A of the binding structure  601  is parallel to the rotation axis  604 A of the linkage bar  604 . 
     The binding structure  601  is rotatable between a rest position and a working position, in synchronized fashion with the linkage bar  604 . 
     When the binding structure  601  is in the rest position, the aperture  601 B is in a first position and the linkage bar  604  is in a lowered position. When the binding structure  601  is in the working position, the aperture  601 B is in a second position, different from the first position, and the linkage bar  604  is in a raised position. When the linkage bar  604  in the raised position, the duckbill  602  extends towards the baling chamber  2 . 
     The binder  6  includes a binder actuator  608 . The binder actuator  608  is configured to drive the linkage bar  604  to pivot from the lowered position to the raised position (and vice versa). The binding structure  601  is free to rotate, so that the fastening element  60 , pulled out of the aperture  6041 B by the duckbill  602  (upon pivoting the linkage bar  604 ), makes the binding structure  601  rotate. Hence, the binding structure  601  is dragged from the rest position to the working position (and vice versa), by the linkage bar  604  pivoting. The binder actuator  608  is then configured to move both the linkage bar  604  and the binding structure  601 . 
     The binder  6  includes a knife  603 . The knife  603  is attached to an external surface of the binding structure  601 . The knife  603  is configured to intercept and cut the fastening element  60  in the working position of the binding structure  601 . The knife  603 , being attached to the binding structure  601 , is movable together with the binding structure  601 . 
     The binder  6  includes a braking mechanism  606 . The braking mechanism  606  is positioned within the binding structure  601 . The braking mechanism  606  includes a roll configured to keep in contact with the reservoir  600  (for example by means of a spring) to control and brake the unrolling of the fastening element  60 . 
       FIG. 10  illustrates an example of the binding structure  601  in the rest position.  FIG. 11  illustrates an example of the binding structure  601  in the working position. 
     The present disclosure also concerns a method for providing round bales in a baler  1 . The method defines a method for operating the baler  1 . 
     The method comprises a step of starting to operate the baler. The step of starting to operate the baler comprises forming a former (first) bale B 0 ; the former bale B 0  is entirely formed in the second part  22  of the baling chamber  2  of the baler  1 . The second part  22  is located on the rear of the baling chamber  2 . During all the period of formatting of the former bale B 0 , the feeding system  4  is in its second configuration, with the feeding channel  402  in its second orientation, with its outlet  402 B opened to the second part  22  of the baling chamber  2 . Hence, the former bale B 0  is formed by feeding crops from the pick-up device  5  to the second part  22  of the baling chamber  2 . 
     During the formation of the former bale B 0 , the guide arm  309  of the conveying assembly  3  is in its raised position, in which it does not stretch the belt  300 . Also, the rotating arm  304  is in its rest position, extending along a rear wall of the tailgate  7 . 
     When the bale B 0  has reached its final dimension, the feeding system  4  is switched to its first configuration, in which the feeding channel  402  is in its first orientation, with its outlet  402 B opened to the first part  21  of the baling chamber  2 . The feeding system  4  is moved from the second configuration to the first configuration by rotating the starter rollers structure  4043 , by means of the actuator  4042 . Specifically, from a lateral point of view on a left-hand side of the baler (with the tongue  10  connectable to the tractor on the left and the tailgate  7  on the right), the starter rollers structure  4043  rotates in an anticlockwise direction. 
     Simultaneously with the rotation of the starter rollers structure  4043 , the guide arm  309  is moved to its lowered position, by means of the guide arm actuator  3011 . So, the guide arm roller  310  pushed against the belt  300 . 
     So, the method comprises a step of starting to form a (second) bale B in the first part  21  of the baling chamber  2 . In fact, the feeding system  4  in the first configuration feeds the crops to the first part  21  to the baling chamber  2 . 
     The method includes a step of binding the former bale B 0 . The method includes a step of discharging the former bale B 0 . 
     While the bale B starts to be formed in the first part  21  of the baling chamber  2 , the former bale B 0 , housed in the second part  22 , is bound with the fastening element  60 . After the fastening element  60  has been applied, the bale B 0  is discharged, by opening the tailgate  7 . 
     When the bale B has reached a predetermined dimension (smaller than its final dimension), the method comprises a step of transferring the bale B from the first part  21  to the second part  22  of the baling chamber  2 . 
     Simultaneously with the transfer of the bale B, the feeding system  4  is moved from the first configuration to the second configuration. During the transferring, the feeding channel continuously varies its orientation from the first orientation to the second orientation. 
     The feeding system  4  is moved from the first configuration to the second configuration by rotating the starter rollers structure  4043 , by means of the actuator  4042 . Specifically, from a lateral point of view on a left-hand side of the baler (with the tongue  10  connectable to the tractor on the left and the tailgate  7  on the right), the starter rollers structure  4043  rotates in a clockwise direction. Hence, during the transfer of the bale B, the outlet  402 B of the feeding channel  402  and the starter rollers  404 ,  404 ′ remain in contact with the bale B. So, the crops are continuously fed to the bale B while it is moved to the second part  22  of the baling chamber  2 . During the transfer of the bale B, the rotating arm  304  is positioned (by means of the actuator  3041 ) in its working position, to stretch the belt  300  around the bale B. Also, during the transfer of the bale B, the guide arm  309  is put in its raised position to allow the bale B passing to the second part  22  of the baling chamber  2 . 
     Then, the method comprises a step of completing the formation of the bale B in the second part  22  of the baling chamber  2 . 
     After the bale B has reached its final dimension, the feeding system  4  is moved back to the second configuration, to start to form a new (third) bale in the first part  21  of the baling chamber  2 . 
     The method includes a step of binding the bale B. The method includes a step of discharging the bale B. 
     While forming the new (third) bale in the first part  21  of the baling chamber  2 , the bale B is bound with the fastening element  60  and, then, discharged. 
     The step of binding includes guiding a fastening element  60  into the baling chamber along an upwardly trajectory (having at least a vertical component). 
     The step of binding includes rotating a linkage bar  604  connected to a duckbill  602  along an upwardly trajectory, from a lowered position to a raised position. In the raised position, the duckbill  602  feeds the fastening element  60  to the baling chamber (or to the bottom roller  609 ). The step of binding includes rotating a binding structure  601  from a rest position to a working position. The rotation of the linkage bar  604  is performed by an actuator  608 . The rotation of the binding structure  601  is synchronized with the rotation of the linkage bar  604 . In an embodiment, the duckbill  602  upon rotating the linkage bar  604  stretches the fastening element  60  so to unroll the fastening element  60  from the reservoir  600  and to make the binding structure  601  rotate. 
     In the step of binding (or at the start thereof), from a point of view on a left-hand side of the baler (with the tongue  10  connectable to the tractor on the left and the tailgate  7  on the right), the linkage bar  604  rotates in an anticlockwise direction, from the lowered position to the raised position. Also, the binding structure  601  rotates in an anticlockwise direction, from the rest position to the working position. 
     During the step of binding, the linkage bar  604  remains in its raised position and the binding structure  601  remains in its working position. During the step of binding, the rotation of the bottom roller  609 , combined with the rotation of the bale B which is being wrapped, makes the fastening element  60  unroll from the reservoir  600 . 
     After the binding of the bale has been completed, the method includes a step of return. In the step of return, the actuator  608  makes the linkage bar  604  return from the raised position to the lowered position. Simultaneously, the binding structure  601  returns from the working position to the rest position. 
     In the step of return, from a point of view on a left-hand side of the baler (with the tongue  10  connectable to the tractor on the left and the tailgate  7  on the right), the linkage bar  604  rotates in a clockwise direction, from the lowered position to the raised position. Also, the binding structure  601  rotates in a clockwise direction, from the rest position to the working position. 
     According to a further aspect, the present disclosure provides a self-propelled (e.g. autonomous-drive) baler comprising:
         a frame ( 100 ), including a baling chamber ( 2 ) for receiving crops for forming a bale, the baling chamber ( 2 ) including a first part ( 21 ), for housing a first amount of crops, and a second part ( 22 ), for housing a second amount of crops;   a conveying assembly ( 3 ), configured for imparting a first rotating movement to the first amount of crops, and, at the same time, a second rotating movement to the second amount of crops;   a pick-up device ( 5 ), configured for picking-up the crops from a field;   a feeding system ( 4 ), including a feeding channel ( 402 ) having an inlet ( 402 A), for receiving the crops from the pick-up device ( 5 ), and an outlet ( 402 B), opened to the baling chamber ( 2 ) for feeding the crops to the baling chamber ( 2 ),
 
wherein the feeding system ( 4 ) is movable between a first configuration and a second configuration, wherein, in the first configuration of the feeding system ( 4 ), the feeding channel ( 402 ) has a first orientation so that the outlet ( 402 B) of the feeding channel ( 402 ) is opened to the first part ( 21 ) of the baling chamber ( 2 ), and, in the second configuration of the feeding system ( 4 ), the feeding channel ( 402 ) has a second orientation different from the first orientation, so that the outlet ( 402 B) of the feeding channel ( 402 ) is opened to the second part ( 22 ) of the baling chamber ( 2 ).