Ladder system agricultural machine provided therewith

Abstract

Ladder system for providing access to a driver's cab of an agricultural machine, comprising a first ladder part comprising a first point of rotation and a second point of rotation, and a second ladder part comprising a third point of rotation, wherein the third point of rotation is mounted rotatably on the second point of rotation; mounting means which are configured to mount the ladder system on a support, wherein the support is for instance a driver's cab or platform of an agricultural machine, such that the first point of rotation is positioned rotatably at a fixed position relative to the support; and coupling means which are configured to achieve that, when the first ladder part undergoes a first pivoting movement relative to the support, the second ladder part undergoes a second pivoting movement relative to the first ladder part.

Description

[0001] LADDER SYSTEM AND AGRICULTURAL MACHINE PROVIDED THEREWITH

[0002] This description relates to a ladder system for an agricultural machine, as well as an agricultural machine provided with at least one such ladder system.

[0003] Some crops, particularly fibre plants such as hemp, grow very tall during cultivation, for instance up to two metres in height or higher. When processing such crops, it is necessary for a driver of a processing machine to be able to see over the crops, and it is therefore preferred for the working area of a driver to be situated higher than a practical maximum height of the crop. For this purpose driver’s cabs of agricultural machines are in practice positioned quite high relative to the ground (i.e. the soil in situ). Platforms, walkways and other locations where work must take place are often also positioned at a great height for various reasons.

[0004] The overall height of an agricultural machine is often determined solely by regulations in respect of vehicles being allowed on the public highway, under which a maximum height of four metres must for instance be observed, or by the access doors of existing barns, which can however also be very high.

[0005] In order to provide access to such high places steps or ladders are provided on agricultural machines. It is preferred to use ladders, and to make these ladders as small as possible in order to keep the agricultural machine relatively compact, particularly narrow. This enhances manoeuvrability and leaves maximum space for arranging other components on or at the agricultural machine.

[0006] Working at great height, and particularly climbing up and down via ladders, is strenuous and not very ergonomically sound for the driver of the agricultural machine. It can also be dangerous, since there is a risk of falling or other accidents. The use of small ladders, which often do not reach anywhere near the ground (soil), increases these problems.

[0007] A possible compromise is to make the ladder retractable and extendable. The activity of retracting a ladder can however per se also contribute to the above stated problems. A retractable ladder must furthermore be locked properly during use, particularly in the wholly extended position, in order to form in this position a stable support for the driver, and must not be used while being retracted, since this could otherwise create danger due to unexpected movements. These conditions are sometimes not met in practice.

[0008] It is an object to at least reduce at least one of the above stated problems.

[0009] It is a further object to provide a ladder system which is lighter, more ergonomic and / or safer in use.

[0010] It is a further object to provide a ladder system which is both user-friendly and compact.

[0011] In a first aspect at least one of these objects is achieved in a ladder system for an agricultural machine, particularly a processing machine, the ladder system comprising a ladder pivotally mountable on a support of an agricultural machine, wherein the ladder is movable between at least a folded-in position and a folded-out position, the ladder comprising:

[0012] - a first ladder part comprising a number of ladder rungs;

[0013] - a second ladder part comprising a number of ladder rungs;

[0014] - a first pivoting element arrangeable between the support of the agricultural machine and the first ladder part for the purpose of mounting the first ladder part pivotally on the support;

[0015] - a second pivoting element arranged between the first ladder part and the second ladder part for the purpose of mounting the second ladder part pivotally on the first ladder part;

[0016] - a drive configured to drive a first pivoting movement of the first ladder part relative to the support;

[0017] - coupling means configured to provide for a mechanical coupling between the first pivoting element and the second pivoting element for the purpose of transmitting the first pivoting movement of the first ladder part relative to the support to a second pivoting movement of the first ladder part relative to the second ladder part.

[0018] While performing the first pivoting movement and the second pivoting movement, the first ladder part remains in substantially the same orientation relative to the support. This can ensure that the second ladder part also remains in the same orientation relative to a ground (soil) on which the agricultural machine rests, and where a user may come from or may want to go. This also limits unexpected movements, and ensures that stepping on or stepping off remains possible when the ladder system is not quite wholly folded out, for instance because the ground is irregular or inclined.

[0019] The coupling means are preferably configured to determine the position of the second ladder part relative to the first ladder part during pivoting.

[0020] The ladder system is particularly configured to provide access to a driver's cab of an agricultural machine, for instance a processing machine for processing (for instance picking) fibre plants.

[0021] The coupling means of the ladder system can be configured to couple the first pivoting movement to the second pivoting movement. The angle between the first ladder part and the support can thus be continuously coupled to the angle between the first ladder part and the second ladder part.

[0022] Because the coupling means couple the pivoting elements mechanically and therefore determine the position of the first ladder part relative to the second ladder part at all times, no separate locking in a determined position, for instance in the wholly folded-in position, the wholly folded-out position or in a random intermediate position between the wholly folded-in position and the wholly folded-out position, is necessary. This makes the ladder system relatively insusceptible to malfunction, operationally reliable and / or light-weight. Furthermore, the user (usually the driver) is supported in stable manner at all times, including in situations (for instance in the vicinity of inclining ground) where the ladder cannot be wholly folded out, this having a positive effect on the personal safety of the user. Such a ladder system can further form a ladder which is relatively compact since the coupling of the first and second pivoting movement enables the ladder system to be folded in in user-friendly manner into a position in which the ladder takes up little space, and forms no obstruction either to components of the agricultural machine which are extended during use and would form an obstruction to a folded-out ladder. Although it may remain possible to configure such a system so that it can be folded manually, the ladder system is preferably configured such that the folding is done by one or more actuators, rendering manual work unnecessary.

[0023] Some embodiments are configured to move between a first position (for instance a wholly folded-in position) and a second position (for instance a wholly folded-out position), wherein the orientation of the first ladder part relative to the support and / or relative to the second ladder part, preferably both, differs between the first position and the second position. Configuring the system on the basis of specific positions enables the positioning of the ladder parts to be optimized.

[0024] In determined embodiments the coupling means are configured to make the second ladder element pivot simultaneously to pivoting of the first ladder element.

[0025] In determined embodiments the coupling means are configured to achieve that, when the first ladder part undergoes a first pivoting movement relative to the support, the second ladder part simultaneously undergoes a second pivoting movement relative to the first ladder part.

[0026] The coupling means are preferably configured to pivot the first ladder part between a substantially upward orientation and a substantially downward orientation, wherein the second ladder part remains oriented substantially downward, during the movement between the folded-in and folded-out position of the ladder. The ladder system can thus remain highly compact in the folded-in position and a maximum height can be bridged in the folded-out position.

[0027] In an embodiment the coupling means comprise a coupling element (such as a chain) which extends between the first and second pivoting element and which is configured to couple the first pivoting movement of the first engaging element relative to the first ladder part to the second pivoting movement of the second engaging element. The movement of the one engaging element is thus coupled over a distance to the movement of the other engaging element so that a predetermined, fixed or varying pivoting ratio between the first and second ladder part occurs. This ratio is in principle irrespective of the direction of the force of gravity on the ladder system and of the weight force exerted on the ladder system, for instance the lower (second) ladder part, by the user when the user steps onto the steps. In an embodiment the coupling means comprise:

[0028] - a first engaging element, for instance a first toothed wheel;

[0029] - a second engaging element, for instance a second toothed wheel; and

[0030] - an elongate, flexible coupling element, for instance a chain or belt, guided round the engaging elements in the manner of a loop.

[0031] In an embodiment the coupling means are coupled to both the first pivoting element and the second pivoting element, and are configured to transmit the pivoting of the first ladder part to a pivoting of the second ladder part in a predetermined ratio. The predetermined ratio can be a 1 : 1 ratio, but can also be a different ratio. As elucidate above, the predetermined ratio can be irrespective of forces exerted on the ladder parts. This may have the result that it is not necessary to lock the second ladder part and first ladder part in a determined (folded-out) position relative to each other (a separate locking can be dispensed with).

[0032] Further provided are embodiments in which the first ladder part and the second ladder part extend mutually in line in a wholly folded-out position for the purpose of forming a substantially straight ladder, and wherein the first ladder part and the second ladder part extend adjacently of each other in a wholly folded-in position. In some embodiments the first position is a folded-out position in which the first ladder part and the second ladder part extend mutually in line for the purpose of forming a ladder, wherein the second position is a folded-in position in which the first ladder part and the second ladder part extend adjacently of each other. By moving between a folded-out and folded-in position in this way no more than the necessary movements are performed. In the folded-in position the ladder has taken on a highly compact form and no longer forms an obstruction to components of the agricultural machine which come to protrude in for instance lateral direction relative to the vehicle during use, while in the folded-out position a form of the steps which is ergonomically optimal for the driver can be realized. In determined embodiments the steps take a completely straight form, but in other embodiments the second step part is substantially vertical in folded-out position while the first step part is slightly at an incline.

[0033] In some embodiments the first pivoting movement and the second pivoting movement are opposite to each other. This provides for a compact rotation path.

[0034] In a preferred embodiment the coupling means comprise:

[0035] - a first engaging element mounted at a fixed distance relative to the support and arranged clear of the pivoting movement of the first pivoting element;

[0036] - a second engaging element mounted fixedly on the second pivoting element;

[0037] - a coupling element guided round the first engaging element and round the second engaging element, wherein the coupling element is embodied to pivot along with the first pivoting movement of the first ladder part.

[0038] In another or further preferred embodiment the coupling means comprise - a first engaging element mounted at a fixed distance relative to the support and arranged clear of the pivoting movement of the first pivoting element, wherein the first engaging element comprises a first pulley or first toothed wheel;

[0039] - a second engaging element mounted fixedly on the second pivoting element, wherein the second engaging element comprises a second pulley or second toothed wheel;

[0040] - a coupling element guided round the first pulley or the first toothed wheel and round the second pulley or second toothed wheel, wherein the coupling element respectively comprises a string or belt or comprises a chain.

[0041] It is particularly preferred to use toothed wheels and a chain or toothed belt, since this prevents slip and so makes the transmission ratios better controllable.

[0042] The coupling element can further be configured to transmit the relative rotation of the first engaging element and the first pivoting element to a corresponding relative rotation of the first ladder part and the second pivoting element during folding in or folding out.

[0043] In a determined embodiment the first pivoting element is fixated relative to the first ladder part and the second pivoting element is fixated relative to the second ladder part. The term “fixated” can be seen here as being fastened such that the relevant pivoting element is unable to pivot relative to the relevant ladder part.

[0044] In an advantageous embodiment the first engaging element is arranged on a bush arranged round the first pivoting element and freely rotatable relative thereto. The bush itself is here mounted on the support and / or on the agricultural machine, for instance via one or more (reaction) rods which are mounted on the support.

[0045] Some embodiments comprise adjusting means for adjusting the orientation of the first ladder part relative to the support in the folded-in position. By controlling the starting orientation (in the folded-in position) of the first ladder part the angle of the first ladder part, and thereby in fact the upper part of the ladder in folded-out state, relative to the support can be adjusted. This for instance makes it possible to position the second ladder part in folded-out position slightly further away (in lateral direction) relative to the side of the agricultural machine (or conversely closer thereto).

[0046] Said rods can take a length-adjustable form for the purpose of forming adjusting means whereby the orientation of the first ladder part (for instance the orientation and the wholly folded- in position) can be varied.

[0047] The ladder system can comprise a single set of coupling means which extend along one side of the ladder. In other embodiments the ladder system comprises however two sets of coupling means, for instance coupling means on either side of the ladder. The coupling means for instance take a dual form: a first set of coupling means along a first side of the first ladder part and a second set of coupling means along a second, opposite side of the first ladder part. Both sets of coupling means preferably take a symmetrical form. In these embodiments the risk of the ladder becoming jammed, for instance as a result of “shearing” of the one ladder part relative to the other ladder part, is further reduced.

[0048] The drive of the first pivoting movement (first rotation) can comprise an actuator, for instance a hydraulic and / or electric actuator. This actuator is preferably powered from the agricultural machine and / or is preferably connected to the support and / or to the agricultural machine itself. The actuator can for instance be a linear actuator or a rotatable actuator. In an embodiment the drive comprises a rotatable actuator in the form of an electric motor.

[0049] In determined embodiments the actuator is coupled to the first pivoting element. When the pivoting element comprises for instance a rotatable pivot shaft, the output shaft of the rotatable actuator (for instance the electric motor) can be coupled or formed integrally with the pivot shaft. In another embodiment the linear actuator comprises a hydraulically operated extending cylinder. Combined with a suitable transmission mechanism, such as a toothed wheel-pinion assembly, the linear movement of the linear actuator can be transmitted to a rotating movement of the first pivoting element (and so of the first ladder part mounted fixedly thereon).

[0050] In other embodiments the actuator is connected to the first ladder part via one or more, usually flexible, pulling elements such as belts and the like. With these pulling elements the actuator can then pivot the first ladder part upward or downward.

[0051] In embodiments of the invention the first ladder part and the second ladder part form in the folded-out position a ladder with an overall length of between 1.5 and 5 metres, preferably between 2 and 4 metres. At heights greater than about 2 m it is advisable to provide additional safety elements, such as fall restraint belts. In determined embodiments these belts can be used to realize the first pivoting movement of the first ladder part relative to the support. In the latter embodiments belts or similar pulling elements are provided which can be pulled up or lowered with a separate drive, such as a winch, in order to pivot the first ladder part respectively upward or downward. In these embodiments the first drive element need not be a pivot shaft driven by an actuator.

[0052] In determined embodiments the ladder system is configured to perform the first pivoting movement and second pivoting movement while the first ladder part and / or the second ladder part is loaded with the weight of a person, for instance a weight of 160 kg. Ensuring that movement is able to take place while a person is standing on the system prevents someone from having an accident or the system from becoming damaged because it is switched on while someone is standing on it.

[0053] In determined embodiments the ladder system is configured to perform the first pivoting movement and second pivoting movement continuously if the load during these rotations fluctuates by the weight of a person, for instance if a person steps onto or off the first ladder part or second ladder part, for instance a person with a weight of 160 kg.

[0054] Some embodiments are configured to perform the first pivoting movement and second pivoting movement continuously if the load during these rotations fluctuates by the weight of a person, for instance if a person steps onto or off the first ladder part or second ladder part, for instance a person with a weight of 160 kg. This also prevents accidents. This can for instance be achieved by configuring the drives, mountings and / or couplings of the ladder system to allow a load higher than the weight of a person, for instance much higher, such as 2000 kg.

[0055] Control means can be provided for controlling the first pivoting movement, second pivoting movement and / or adjusting means, for instance comprising an electronic control unit connected in wired or wireless manner to one or more actuators. It is an option to provide a wireless network element whereby connection is possible by means of a remote control or with software on a mobile phone in order to thereby control the ladder system.

[0056] In a second aspect at least one of these objects is achieved in an agricultural machine, particularly a processing machine, provided with one or more of the ladder systems described herein. An agricultural machine benefits greatly from provision of such a ladder system, also in light of the great heights having to be bridged and the variations in the ground (inclining ground, irregular ground and the like). Such a ladder system can however be provided in fixed or modular form in many applications, for instance on other types of vehicle such as trucks, on fixed installations, on buildings, on artworks, or on terrain formations. The mounting means can be configured to be mounted on a support which is configured in accordance with determined dimensions or standards.

[0057] In a second aspect at least one of these objects is achieved in an agricultural machine provided with a ladder system according to any one of the foregoing claims.

[0058] Further advantages, features and details of the invention will be elucidated with reference to the following description of some embodiments thereof. Reference is made in the description to the accompanying figures, in which:

[0059] Figure 1 is a partially cut-away side view of an embodiment of a processing machine provided with a ladder system according to an embodiment of the invention;

[0060] Figure 2 is a schematic top view of the processing machine of figure 1 , provided on the front side with a picking unit according to the invention;

[0061] Figure 3 is a partially cut-away perspective side view of the embodiment of the processing machine according to figures 1 and 2;

[0062] Figure 4 is a side view of a machine according to an embodiment of the invention, wherein a picking unit 3 according to the invention is mounted on the processing machine and is suitable for processing of long fibre plants such as hemp; Figure 5 is a detail view of an embodiment of a picking unit of the processing machine according to the invention;

[0063] Figures 6A and 6B show an embodiment of a ladder system in different positions, while figure 6C shows a detail view at the position of the connection of the ladder to the agricultural machine;

[0064] Figures 7A-7D show the embodiment of a ladder system according to figures 6A and 6B in different positions.

[0065] Figure 8 shows a part of an embodiment of a ladder system wherein parts are visible which are configured to drive the ladder system 100.

[0066] Figures 9A and 9B show a part of an embodiment of a ladder system in different positions, in which coupling means are visible in more detail.

[0067] Figures 10A-10C show a part of an embodiment of a ladder system which is arranged on a schematically shown embodiment of an agricultural machine which is in different orientations.

[0068] Several examples of embodiments of the invention, in which the agricultural machine is a processing machine which is specifically suitable for picking fibre plants such as hemp or flax, are given below. Such a processing machine is also referred to as a fibre plant picking machine or, more specifically, a flax picking machine or hemp picking machine. It will be apparent that the invention also extends to other processing machines, for instance - although not limited to - machines which are more suitable for picking up hemp or flax, such as flax or hemp pick-up machines.

[0069] When reference is made here to picking fibre plants or picking them up from a ground surface, this can mean that the whole fibre plant is picked or picked up or that one or more parts of the whole fibre plant are picked or picked up.

[0070] Flax is a fibre crop which is cultivated for making linen (clothing, home decor), among other things. The flax plant is usually between 80 and 120 cm long, and is harvested using a drawn or self-propelling flax picking machine. Hemp is likewise a fibre crop which is cultivated for making textile fabrics (clothing or home decor), among other things. The hemp plant is a lot longer than the flax plant. The hemp plant is characteristically between 140 cm and 320 cm in length. Hemp is harvested with a hemp picking machine configured specifically for this purpose.

[0071] The flax picking machine or hemp picking machine comprises a vehicle (usually a self- propelling vehicle, although a drawn vehicle is also possible) having for this purpose on the front side a picking unit embodied specifically to pull respectively the flax plants or hemp plants from the ground. The harvested fibre plants are then processed by the flax or hemp picking machine by displacing them to the rear side of the flax or hemp picking machine and placing the fibre plants on the ground surface during travel. Hemp plants must still be cut into two or more parts before they are suitable for placing down on the ground. The flax plants / hemp plants are placed flat on the ground in long rows, also referred to as “swathes”, wherein the stems of the harvested plants extend substantially transversely of the longitudinal direction of the swathes. This placing back of the flax or hemp flat onto the ground surface so that said swathes are created is also referred to as “depositing” or “picking up”. When the flax or hemp plants are placed in rows or swathes, an intermediate space is left between adjacent rows. These spaces are provided in order to prevent the swathes from becoming tangled in each other.

[0072] The harvested plants which were placed flat on the ground in swathes are then retted under the influence of a combination of dew, rain and sunlight. The retting of the flax or the hemp by leaving them on the ground (i.e. a field or retting field) for some time is referred to in the field of processing flax as field retting or dew retting. In order to obtain a uniform retting and to prevent rotting of the flax or the hemp, the fibre plants placed flat on the ground in rows must be flipped over regularly. This flipping over of the flax or hemp placed flat on the ground is also referred to as “turning”. The turning of the flax is performed using a drawn or self-propelling flax turning machine, while the turning of the hemp is performed using a drawn or self-propelled hemp turning machine. In determined embodiments of the present invention the flax turning machine and the hemp turning machine are combined into one single machine, which can thus process both hemp and flax. According to determined embodiments of the invention, the flax and hemp turning machines are further also constructed as respective flax and hemp picking machines, and in yet another embodiment the machine is or can be made suitable for at least picking flax, picking hemp, turning flax and turning hemp.

[0073] Figures 1-3 show a self-propelling vehicle 2 of a processing machine 1 according to a determined embodiment of the invention. Self-propelling vehicle 2 comprises a vehicle chassis 6 on which four wheels, i.e. two front wheels 7 and two rear wheels 8, are arranged in known manner. In figure 1 a part of the front left side of the vehicle has been cut away (i.e. the front left wheel and the relevant part of the wheel suspension) in order to obtain a better view of the construction of the vehicle on the front side. The vehicle is self-propelling, which means that it is provided with its own drive motor whereby a number of the wheels, for instance the two rear wheels, or all the wheels can be driven. The self-propelling vehicle 2 is preferably driven by a number of hydraulic motors, one for each wheel 7, 8, which hydraulic motors are connected to a hydraulic pump unit which is configured to provide a hydraulic medium under pressure via a hydraulic circuit provided in the vehicle. The hydraulic pump unit is driven by a combustion engine, for instance a diesel engine. The combustion engine and hydraulic pump unit together are designated in figure 4 in schematic manner with reference numeral 9.

[0074] The vehicle is steered from a driver’s cab 23 on the front side of the vehicle. The driver’s cab 23 can be reached from the ground via a ladder system 100 provided on the side of the machine. This ladder system comprises a folding ladder which is mounted via mounting means 172 on a support 50 provided on the vehicle. The support 50 can for instance form part of the chassis of the vehicle, but can also be mounted on for instance the driver's cab. The ladder system is constructed from, among other things, ladder parts which are pivotable relative to each other. The ladder parts are pivotable between a wholly folded-in position and a wholly folded-out position (and, in determined embodiments, pivotable into any random intermediate position between the wholly folded-out position and the wholly folded-in position). In the folded-out position (and in principle also in any of the intermediate positions) the mutual orientation of the ladder parts, i.e. the angle between the first, upper ladder part relative to the second, lower ladder part, can be securable such that the driver is safely able to climb onto or come down from the machine at all times. A specific embodiment of the ladder system 100 will further be described in more detail.

[0075] The chassis 6 of the vehicle comprises two parallel conveyors 11, 12 formed by a loading floor or platform 14 and two endless conveyor belts provided thereabove. At least one of the endless conveyor belts can here be adjusted in lateral direction so that the intermediate distance between the two conveyor belts can be adjusted, this in order to realize a suitable intermediate distance for shorter or longer swathes. Referring to the top view of figure 2, the two conveyors 11, 12 are arranged along both longitudinal edges of vehicle 2 so that a quantity of fibre plants can be transported in axial rearward direction (PA, a) with each of these. In the shown embodiment each of the conveyors 11, 12 comprises an endless conveyor belt 82 which runs on a front roller 80 and a rear roller 81. At least one of the rollers 80, 81 is driven via a drive (not shown). In a determined embodiment the drive comprises a hydraulic motor arranged in the rear (triple) pulley or roller 81. Each of the respective part-rollers of the multiple (triple) pulley is driven separately yet synchronously to each other, preferably according to a determined ratio as desired. So-called carriers 83 are provided on the outer side of conveyor belt 82. These can displace the fibre plants lying on platform 14, at least on guide rails 84 of the platform (figure 1), in said axial rearward direction (PA, a) to the rear side of chassis 6. The fibre plants are thus enclosed here between conveyor belt 82 and guide rails 84.

[0076] On the rear side of vehicle 2 a delivering unit 13 is arranged for each conveyor 11, 12. In the shown embodiment the delivering unit 13 comprises an endless belt conveyor 87. The endless belt of each of the endless belt conveyors 87 is guided around a roller 86 and around said roller 81 (a belt conveyor 87 therefore sharing this with a conveyor 11 or 12). Driving of delivering unit 13 takes place the first roller 81. This extends obliquely rearward to some extent and is configured to displace the fibre plants coming from respective conveyor 11, 12 downward in dosed and controlled manner so that the fibre plants can be placed on the ground on the rear side of the vehicle. As shown in figure 2, when the vehicle moves in an axial forward direction (PA,v), the fibre plants (v) picked or picked up on the front side of the vehicle will be displaced to the rear side of vehicle 2 and will each be placed down on the ground (o) in a separate row 15a, 15b via delivering units 13. In determined applications the rows 15a, 15b of fibre plants are composed of the same parts of the fibre plant, for instance in the case of the relatively short flax plants. In other embodiments the one row is however composed of the lower portions of the harvested fibre plants, while the other row consists of the upper portions of the harvested fibre plants. This is for instance the case when hemp plants are harvested. In both cases the fibre plants are placed flat on the ground, parallel to each other as far as possible, after which said retting can commence.

[0077] Vehicle 2 is provided with a picking unit 3 on its front side in order to be able to pick the fibre plants. This can be a first picking unit developed especially for picking long fibre plants (such as hemp) (also referred to herein as a hemp picking unit), or a second picking unit developed especially for picking short fibre plants (such as flax) (also referred to herein as a flax picking unit). Depending on the length of the crop to be picked, a different picking unit must thus be mounted on the vehicle. Different examples of a picking unit for picking relatively long fibre plants are shown in figures 4 and 5.

[0078] Referring to figures 1 and 3 in particular, the chassis comprises on the front side of chassis 6 of vehicle 2 a number of support chassis parts 39a, 39b. The support chassis parts 39b extend in line with the rest of chassis 6 of vehicle 2, while the support parts 39a mounted on support parts 30b and the rest of chassis 6 are disposed obliquely. Chassis 6 is further provided with a number of hinges 48 on which two parallel longitudinal lifting arms 47a, 47b are arranged. Both longitudinal lifting arms 47a, 47b are connected at their outer ends to a transverse lifting arm 47c. The support chassis parts 39a, 39b, longitudinal lifting arms 47a, 47b and transverse lifting arm 47c together form a strong and stable support structure for mounting a number of actuators whereby a picking unit 3 coupled to the chassis 6 of vehicle 2 can be pivoted upward and downward. Together with these actuators the support structure forms the above stated lifting unit.

[0079] The pivoting of picking unit 3 is brought about by a number of actuators, for instance electric actuators (motors) or, preferably, lifting cylinders 36, of the lifting unit (figure 3). In figures 1 and 3 the actuators are formed by two lifting cylinders 36. In the shown embodiment two lifting cylinders positioned laterally adjacently of each other are provided. In other embodiments use is however only made of a single lifting cylinder, or three or more lifting cylinders are applied. The lifting cylinders are mounted pivotally on the support chassis parts 39a, 39b via hinges 38 and on transverse lifting arm 47c via a mounting support 38b. A further description of the construction of the lifting unit and of the operation thereof will follow below.

[0080] Further referring to figure 3, chassis 6 is provided on either side of the support chassis parts 39a, 39b with first mounting means 34 for mounting a picking unit 3 thereon in pivotable and releasable manner. The first mounting means 34 can be embodied in numerous ways, but in the shown specific embodiment comprise a number of flanges in which respective pivot shafts 43 can be rotatably mounted. Each of the different picking units 3 comprises one or more frame parts of a support frame, which can be mounted in pivotable and releasable manner on said first mounting means 34. In the embodiments shown in figures 4 and 5 the picking unit 3 comprises a first, lower hemp picking element 25 and a second, upper hemp picking element 26 placed thereabove. The lower hemp picking element comprises a frame part 30 which can be mounted pivotally and in easily releasable manner on first mounting means 34 of the vehicle using second mounting means 32. The upper hemp picking element 26 comprises a frame part 133 which also takes a pivotable (yet not necessarily easily releasable) form, albeit that in the shown embodiment frame part 33 of the upper hemp picking element 26 is mounted on the frame part 30 of the lower hemp picking element 25 instead of directly on chassis 6 of the vehicle. In other embodiments (not shown) it is however precisely the upper hemp picking element that is mounted on chassis 6 of vehicle 2, and the lower hemp picking element on the upper hemp picking element. In still further embodiments (not shown) the two hemp picking elements are mounted pivotally and releasably on vehicle 2. In yet other embodiments only one picking element is provided, wherein this one picking element is configured to pick shorter hemp plants, such as flax. The flax picking element can in principle have a similar construction as one of the two hemp picking elements 25, 26, and in determined embodiments the flax picking element is even almost identical or wholly identical to a hemp picking element.

[0081] For mounting on the chassis 6 of vehicle 2, more particularly on the first mounting means 34 thereof, such as the flanges 34 positioned on or close to the sides of vehicle 2 and having the pivot shafts 43 mounted therein, the picking unit 3, in the shown embodiment the lower hemp picking element 25, is provided with second mounting means 32. The second mounting means 32 are embodied for easy mounting on first mounting means 34. The first and second mounting means 34, 32 together form a mounting hinge between picking unit 3 and vehicle 2, such that picking unit 3 can be pivoted in upward and downward direction around the lying pivot shafts 43.

[0082] To make picking unit 3 pivot relative to vehicle 2 the above described lifting unit is utilized. As described above, the lifting cylinders 36 are arranged rotatably on the flanges 38a of chassis 6 at one outer end. On their opposite sides the lifting cylinders 36 are coupled via mounting supports 38b to the transverse lifting arm 47c. Transverse lifting arm 47c of the lifting unit has a substantially U-shaped cross-section, which is clearly visible particularly in figures 1 and 3. The U- shape forms a receiving space for a part of the frame part 30 of the lower hemp picking element 25. In other words, the picking unit 3 can be connected to the lifting unit in simple manner by placing frame part 30 of lower hemp picking element 25 into the transverse lifting arm 47c of the lifting unit from above or, conversely, by simply pressing transverse lifting arm 47c against frame part 30 from below. Finally, the whole is locked by a locking mechanism 70 (figure 3), for instance in the form of a remotely controllable extending cylinder which in extended state ensures that picking unit 3 remains locked to the lifting unit. The lifting unit is then ready to lift picking unit 3.

[0083] As shown in figure 1 with arrows (Pi, P2), the length of each of the lifting cylinders 36 and 42 is controllable. It will be apparent that when the length of lifting cylinders 36 and / or 42 is increased, frame part 30 and frame part 33 will respectively pivot upward, while the relevant frame part 30, 33 will pivot downward if the length of lifting cylinders is reduced. In this way the height of the free outer end of the picking unit can be varied, for instance in order to adjust the position in which the picking unit grips the fibre plants and pulls them from the ground during travel of the vehicle.

[0084] Figures 4 and 5 show different embodiments of a processing machine 1 according to the invention, wherein the processing machine is provided with an exchangeable picking unit comprising a first picking element and a second picking element placed thereabove. This embodiment is embodied for picking relatively long fibre plants, such as hemp plants, as shown schematically in the figure. In the shown embodiment the processing machine 1 comprises the above stated self-propelling vehicle 2 and a specific picking unit 3, i.e. a hemp picking unit. The hemp picking unit comprises a lower hemp picking element 25 and arranged thereabove an upper hemp picking element 26. The lower picking element 25 is mounted on the first mounting means of the vehicle in the above stated manner, this such that the first hemp picking element 25 can be pivoted in upward and downward directions by controlling one or more of said lifting cylinders 36. The upper hemp picking element 26 is pivotally arranged via pivot shafts 43 on the lower hemp picking element 25 so that the upper hemp picking element 26 can be pivoted (pivoting directions R2) relative to the first hemp picking element 25 (and relative to vehicle 2 and the ground surface). The pivoting movement of the upper hemp picking element 26 relative to the lower hemp picking element 25 is driven by a number of further lifting cylinders 42 arranged on frame parts 30, 33, wherein increasing the length of lifting cylinders 42 results in an upward rotation of the upper hemp picking element 26 relative to the lower hemp picking element 25, while reducing the length results in a downward rotation of the upper hemp picking element 26 relative to the lower hemp picking element 25.

[0085] Figure 4 shows schematically that the relatively long fibre plants (h), such as hemp, kenaf, jute or similar fibre plants, have an overall length ltot(characteristically between 1.4 and 4.0 metres, 2.4 metres on average). The lower part (hl) of each of the fibre plants (h) has a length lo(for instance 110 cm to 120 cm), while the upper part (h2) has a length lb (for instance 120 to 130 cm). In the shown embodiment both lengths loand lb are roughly the same, although in practice these lengths may of course differ. What is important is only that the fibre plants (h) are cut into at least two parts (hl, h2) and then processed further by processing machine 1. Said lower hemp picking element 25 is for this purpose made suitable for picking and processing the lower fibre plant parts (hl), while the upper hemp picking element 26 is intended for picking the upper fibre plant parts (h2).

[0086] The upper hemp picking element 26 comprises a transport installation 46 for gripping hemp plants and transporting them to vehicle 2, while the lower hemp picking element 25 comprises a (preferably wholly or almost wholly identical) transport installation 45 whereby hemp plants can likewise be gripped and transported to vehicle 2. When vehicle 2 travels in a forward direction (PA,v), the upper hemp picking element 26 will reach the hemp plants first. After a short time interval the lower hemp picking element 25 will also reach these same hemp plants. In other words, the engaging position at which the upper hemp picking element 26 engages a determined hemp plant at a determined point in time is shifted relative to the engaging position at which the lower hemp picking element 25 engages a (different) fibre plant at the same point in time. This has the result that the upper hemp picking element 26 first engages the upper part (h2) of the hemp plants and cuts them loose from the lower part (hl) with a cutting element 55 (also referred to here as mowing element 55) provided on the front side of the upper hemp picking element 26, while it is after this, so only when upper part h2 has been cut loose and is already being carried away, that the lower hemp picking element 25 will engage on the lower part (hl) of the same hemp plant.

[0087] The lower hemp picking element 25 is configured to engage the lower part (hl) of the hemp plant. As a result of the forward movement of vehicle 2 and / or as a result of displacement by means of the transport installation 45 to be described further below the hemp plants are pulled from the ground along with the roots.

[0088] As shown in figure 4, the gripped upper part (h2) of a hemp plant (h) which has been cut loose with mowing element 55 is picked up by the upper hemp picking element 26. This upper part (h2) of the fibre plant comprises a top, flower or plume portion (h5) and a remaining upper portion (h3). The top portion (h5) of the upper part (h2) of the hemp plant (h) can be removed using a cutting unit 138. The top portion (h5) is here discharged via discharge means comprising a discharge pipe 28 with an inlet opening close to the cutting unit, a centrifugal fan 20 connected to the discharge pipe and an outlet opening to a receptacle 16 arranged via a frame 17 on the rear side of vehicle 2.

[0089] As further elucidated elsewhere, in determined embodiments the two delivering units 13 are configured to place a first row 15a of only lower remaining parts (h4) of the hemp plant and a second row 15b of only upper remaining parts (h3) of the hemp plants (h) onto the ground and then have them undergo the desired retting process (figure 2).

[0090] Figures 4 and 5 show a side view of a first embodiment of the hemp picking unit 3. Figures 4 and 5 also show the transport installations 45, 46 whereby the hemp plants are gripped and transported to vehicle 2. Each of the transport installations 45, 46 comprises a number of endless belt conveyors, more particularly a first number of endless belt conveyors for gripping the crop, transporting it and tilting the crop during transport, and a second number of endless belt conveyors for receiving the crop from the first number of belt conveyors and transporting the crop to the conveyors on vehicle 2. The second number of conveyors (characteristically 3, 4 or more) is here usually smaller than the first number of conveyors (characteristically 1 or 2).

[0091] Guide elements 40 are provided on the front side of both the lower hemp picking element 25 and the upper hemp picking element 26. Their object is to make it possible to be able, when the vehicle and the picking unit 3 mounted thereon are advanced, to push the hemp plants (h) to the side and guide them into a number of, in figure 5 six per hemp picking unit (although this can also be a greater or smaller number in other embodiments), passages 411-416for the upper hemp picking element 26 and passages 417-4112for the lower hemp picking element 25, all configured to receive and grip the hemp plants. These twelve passages are formed by a number of driven conveyor belts and a number of guide rollers. The guide rollers can perform one or more different functions. A guide roller can for instance be a support roller for supporting a conveyor belt, be a drive roller for driving a conveyor belt, and / or be a pressing roller for locally providing a pressing force against a conveyor belt.

[0092] Figure 6 A shows an embodiment of a ladder system 100 in the wholly folded-out position. Figure 6C shows a part of this embodiment in more detail. The ladder system 100 is configured to form a ladder with a number of (ladder) rungs 102, which are connected by longitudinal elements 103. Longitudinal elements 103 can be manufactured integrally or can comprise respective housings 131, 132. A ladder system 100 can comprise one or more handrails 104, which are for instance mounted on one or more longitudinal elements 103.

[0093] A ladder system 100 comprises a first ladder part 111 and a second ladder part 112. The first ladder part 111 extends between a first outer end 114 and an opposite second outer end 116. The ladder system further comprises a first pivoting element 113 (comprising a first pivot shaft, also referred to as first rotation shaft) close to the first outer end 114 and at least one second pivoting element 115 (comprising a second pivot shaft, also referred to as rotation shaft) close to the second outer end 116. The second ladder part 112 extends between a third outer end 118 and an opposite fourth outer end 119. The second and third ladder part are mutually coupled via the second pivoting element 115. The second pivoting element 115 is mounted fixedly on the second ladder part 112 and is rotatable relative to the first ladder part, while the first pivoting element 113 is mounted fixedly on the first ladder part 111 and is rotatable relative to a support 50 (only shown schematically in the figures) provided on the vehicle. When reference is otherwise made here to a ladder system comprising “a pivoting element”, this does not mean that this can be only one element. In determined embodiments there are a plurality of (for instance two) pivoting (part) elements arranged to provide rotation around a shared imaginary axis, for instance a pivoting (part) element through a left-hand longitudinal element 103 and a separate pivoting (part) element through a right-hand longitudinal element 103.

[0094] The ladder system 100 comprises ladder mounting means 105 which are configured to mount the first ladder part 111 on a support 50 (see figures 6A, 7A and 7D), for instance a support provided on the driver's cab or chassis of the vehicle. The ladder mounting means 105 can for instance comprise one or more profiles 117a, 117b (figure 6B) with screw holes arranged therein for rigid mounting on support 50. The ladder mounting means 105 are further provided with openings with bearings in which the first pivoting element 113 is arranged rotatably so that the first pivoting element 113 can rotate relative to support 50. The mounting means can however take many other forms, such as the form of bearings configured to receive a pivoting element of ladder system 100. The first ladder part 111 is further mounted fixedly on the first pivoting element 113, for instance via two clamping parts 175 (figure 8) mounted on either side of ladder part 111, whereby the clamping part is clamped fixedly onto the pivoting element 113.

[0095] Further mounting means 172, whereby an engaging element 133 to be described below can be mounted on support 50, is also provided. In the shown embodiment the further mounting means 172 comprise a first flange 173a which is mounted on a first bush 174a which can rotate freely around the pivoting element 113. The first flange 173a is mounted on adjusting means 106, in the shown embodiment a type of reaction arm, the length of which can be adjusted by turning it manually. The adjusting means 106 are in turn mounted on support 50. An engaging element 133 is arranged on first bush 174a, wherein the engaging element 133 comprises a toothed wheel in the shown embodiment. Because the engaging element / toothed wheel 133 is arranged on the first bush 174a and the first bush 174a is mounted fixedly on support 50, the first pivoting element 113 and the ladder part 111 mounted fixedly thereon can pivot (i.e. rotate) freely relative to engaging element 133.

[0096] In the embodiment of the figures the further mounting means 172 also comprise a second flange 173b which is mounted on a second bush 174b which can rotate freely around pivoting element 113. This second flange is also mounted with adjusting means 106 on the support. A further engaging element 133, once again in the form of a toothed wheel, is arranged on second bush 174b. Because the engaging element 133 is arranged on second bush 174b and this bush is mounted fixedly on support 50 via mounting means 172, the first pivoting element 113 and the ladder part 111 mounted fixedly thereon can pivot (i.e. rotate) freely relative to the further engaging element 133.

[0097] Figure 6B shows an embodiment of a ladder system 100 in a different position than that of figure 6A, more particularly in the wholly folded-in position. This wholly folded-in position of the ladder can be reached by pivoting the first ladder part 111 and the second ladder part 112 about the respective pivoting elements. In the shown situation the first ladder part 111 is rotated through about 180 degrees. The second ladder part 112 has here in fact remained in the same orientation relative to the ground.

[0098] Figures 7A, 7B, 7C and 7D are more schematic views of an embodiment of the ladder system 100 in different positions. Figure 7 A shows the ladder system 100 in the wholly folded-out position, which corresponds with the position of the ladder system 100 in figure 6A. Figure 7D shows the ladder system 100 in a second position which corresponds with the position of the ladder system 100 in figure 6B, and which will be referred to here as a (wholly) folded-in position. Figures 7B and 7C show respectively a random first intermediate position and a random second intermediate position of the ladder system 100 between the wholly folded-out position and the wholly folded-in position.

[0099] A ladder system 100 can be configured to pivot from the folded-out position, via the first intermediate position to the second intermediate position, and on to the folded-in position, and / or vice versa from the folded-in position, via the second intermediate position to the first intermediate position, and on to the folded-out position. When performing these movements, it is possible to come to a standstill in one or more intermediate positions along the way, although it is preferred to always perform the movement in a single, continuous movement. In each of the positions the ladder parts are in principle fixated relative to each other by means of the coupling means (which is understood to mean that when the fold-in or fold-out movement is stopped, the first ladder part extends at a fixed angle relative to the second ladder part. When a person for instance steps onto the ladder part, the position of this ladder part will in principle not change relative to that of the second ladder part).

[0100] The shown movement between the different positions is done by rotating the first ladder part 111 in a first pivoting movement through a rotation path R1 (compare figure 7B) relative to a support 50 on which the ladder system 100 is mounted, and simultaneously rotating the second ladder part 112 in a second pivoting movement through a rotation path R2 (see also figure 7B) relative to the first ladder part 111.

[0101] In the shown folded-out position the first ladder part 111 and the second ladder part 112 extend substantially mutually in line. In the shown movement between the folded-in position and the folded-out position the orientation of the first ladder part 111 relative to a support 50 on which the mounting means 105 are mounted changes, and the orientation of the first ladder part relative to the second ladder part 112 changes. In the shown folded-in position the first ladder part 111 and the second ladder part 112 extend at least partially adjacently of each other, and substantially parallel. It is also possible to configure the ladder system 100 to move between a different folded- out position and folded-in position, or between other extreme positions.

[0102] In the shown embodiment the first pivoting movement and second pivoting movement are substantially of equal magnitude, and are opposite to each other. During the first pivoting movement and second pivoting movement the second ladder part 112 maintains an at least substantially fixed orientation relative to the support 50. This orientation is vertical in the figures.

[0103] Other rotation ratios, rotation directions and / or orientations are also possible, in different combinations, depending on the requirements of the intended use of the ladder system 100.

[0104] Figure 8 shows a part of an embodiment of a ladder system 100 wherein parts are visible which are configured to drive the movement of the individual ladder parts. Figure 8 does not show the side walls of the casing 121, making parts on the inside of casing 121 visible. Such a casing

[0105] 121 can be arranged to protect parts against contamination and / or damage.

[0106] Driving of the ladder movement can take place via a drive 130, comprising a drive shaft

[0107] 122 which forms part of or is coupled to the above stated first pivoting element 113. The drive 130 also comprises an actuator 125, for instance an electric motor with a rotating drive shaft or, as shown in the figures, a hydraulic drive cylinder. The drive 130 can be mounted on frame 50 or on ladder system 100 itself. When there is a rotatable actuator, the pivoting element 113 can be driven directly, for instance by coupling the actuator shaft (for example the output motor shaft of an electric motor) directly to pivoting element 113. When there is a linear actuator 125 (as in the shown embodiment), the linear movement of the output shaft of the actuator can be converted into a rotating movement via a gear rack system. The gear rack system 124 can for instance comprise a rack 126 and a pinion 127 (see figure 8). Other embodiments of a drive mechanism are also possible. It is for instance possible to arrange the shaft 122 and bush 173b functionally in reverse.

[0108] Figures 9A and 9B show a part of an embodiment of a ladder system in different positions. Figure 9A is the folded-out position and figure 9B is the folded-in position. In the folded-out position of figure 9A the second step part extends vertically or almost vertically, while the first step part is slightly at an incline. In preferred embodiments the first ladder part and the second ladder part extend at an angle of between 10 degrees and 50 degrees, preferably between 15 degrees and 30 degrees, relative to each other in wholly folded-out position. This imparts to the step a form which is extremely pleasant and ergonomically sound for the driver. In de embodiment of figures 9 A and 9B the coupling means 138 are visible. This in that parts of a first housing 131 and a second housing 132 which were visible in figure 6 A are not shown here (i.e. have been omitted from the figure). Such a housing 131, 132 can be arranged to protect coupling means 138 against contamination and / or damage.

[0109] The shown coupling means 138 are embodied such that they realize a coupling between the engaging elements on the two outer ends of the first ladder part, wherein the coupling transmits any pivoting movement (rotation) of the first pivoting element and the first ladder part 111 mounted thereon to the second ladder part 112. This results in a relative rotation of the first ladder part and second ladder part. The transmission ratio of the first pivoting movement of the first ladder part 111 and the second pivoting movement of the second ladder part 112 is here a desired fixed ratio. This fixed ratio, determined by the coupling means, is irrespective of the forces exerted on the two ladder parts, which has the result that it is not necessary to lock the second ladder part and first ladder part in a determined (folded-out) position relative to each other (a separate locking can be dispensed with).

[0110] In the shown embodiment the coupling means 138 are provided on either side of the ladder. The coupling means 138 on a first side will be described in more detail in the following. The coupling means 138 on the opposite, second side are embodied similarly, and a separate detailed description has been dispensed with.

[0111] The coupling means 138 comprise a first engaging element 133 in the form of a first toothed wheel, a second engaging element 134 in the form of a second toothed wheel and an elongate, flexible coupling element 135, in the shown embodiment a chain, guided round the engaging elements 133, 134 in the manner of a loop. All these coupling means 138 are arranged in a first housing 131 of the first ladder part 11 and / or at least the second engaging element 134 and the coupling element 135 can be arranged at least partially in a second housing 132 of the second ladder part 12.

[0112] The shown engaging elements 133, 134 are toothed wheels and the shown coupling element 35 is a link chain, although pulleys and a string or an (optionally toothed) belt could for instance also be provided. An advantage of using a chain is that slip becomes almost impossible. With this object in mind, it is also possible to opt for a toothed belt.

[0113] One or more rotating guide elements 136 (for instance toothed wheels arranged rotatably on ladder part 111) and / or fixed guide elements 137 can be provided to guide coupling element 135 and / or to keep it tensioned between the first engaging element 133 and the second engaging element 134. This has the advantage that it results in more freedom of choice in respect of the form of the first ladder part 111, enabling a more compact design.

[0114] The coupling means 138 are configured to achieve that, when the first ladder part undergoes a first pivoting movement relative to the support 50, the second ladder part undergoes a second pivoting movement relative to the first ladder part.

[0115] In the shown embodiment the first engaging element 133 comprises a toothed wheel on the bush 23. This is a way of having the first pivoting element 112 be rotatable relative to the first engaging element 133 (which is in principle positioned in stationary manner relative to the support). The shown first engaging element 133 is configured to therefore undergo a relative rotation movement relative to the first ladder part 111 during the first pivoting movement, and not to rotate relative to support 50.

[0116] In the shown embodiment the second engaging element 134 comprises a toothed wheel which is mounted fixedly on the second pivoting element 115, wherein the second pivoting element is mounted fixedly on the second ladder part. Alternatively, the second engaging element can be mounted fixedly on the second ladder part itself. The first ladder part is arranged pivotally on the second pivoting element 115. The shown second engaging element 134 is configured to rotate relative to the first ladder part 111 during the second pivoting movement, and not to rotate relative to the second ladder part 112.

[0117] In the shown embodiment the coupling element 135 is configured to couple the first pivoting movement of the first engaging element 133 relative to the first ladder part 111 to the second pivoting movement of the second engaging element 134.

[0118] The coupling means 138 can be arranged such that they prevent the second ladder part 112 from undergoing a second pivoting movement relative to the first ladder part 111 if this second pivoting movement is not brought about by the coupling means 138. A coupling element 135 which comprises a chain between two toothed engaging elements 133, 134 can be configured to achieve this by blocking unintentional rotations.

[0119] The coupling means 138 can be configured such that the first pivoting movement and the second pivoting movement are coupled such that they are identical to each other. This can for instance be achieved when the first engaging element 133 and the second engaging element 134 are configured such that their numbers of revolutions during the first pivoting movement and second pivoting movement are identical to each other, in other words, that their transmission ratio equals 1.

[0120] Coupling means 138 can provided in or on longitudinal elements 103. Parallel longitudinal elements 103 can be provided at multiple locations on a ladder part 111, 112. In the shown embodiment longitudinal elements 103 are provided on both longitudinal sides of the first ladder part 111. Coupling means 138 can be provided in a plurality of ladder parts 103. The risk of torsion of the ladder system 100 can thus be reduced considerably during driving. In the shown embodiment coupling means 138 can be provided in both longitudinal elements 103, for instance a set of coupling means 138 comprising a first engaging element 133, second engaging element 134 and coupling element 135 in each longitudinal element 103. These sets of coupling means 138 can be embodied symmetrically to each other, for instance the same but mirrored.

[0121] Figure 9B shows a part of an embodiment of a ladder system 100 in a different position.

[0122] Figure 10A shows a part of an embodiment of a ladder system 100 which is arranged on a schematically shown embodiment of an agricultural machine 141. The agricultural machine 141 comprises a chassis 142, a number of wheels 143, an agricultural implement 144 mounted on the front or rear of the machine, a driver's cab 145, a platform 146 for approaching the driver's cab 145 or for performing work on or to the agricultural machine 141, and control means 147. A ground 156 on which the agricultural machine 141 rests is designated.

[0123] Figure 10B shows a part of an embodiment of a ladder system 100 which is arranged on a schematically shown embodiment of an agricultural machine 41 which is in a different orientation in that the agricultural machine rests on an inclining ground. In figure 10B the ladder system forms a ladder in a different orientation than in figure 10A.

[0124] Figures 10A-10C further show the above stated adjusting means 106 as part of the mounting means 105 which are arranged between the agricultural machine 141 and the ladder system 100. In the shown embodiment the adjusting means 106 comprise a plurality of length- adjustable rods (also referred to here as reaction arms, in analogy with such arms in automobiles). The rods can for instance be of a type wherein a rod provided with external screw thread can be screwed into a pipe provided with internal screw thread, wherein the length of the adjusting means 10 can be reduced or increased by respectively screwing in and screwing out the rod.

[0125] The adjusting comprises for instance of setting a basic orientation of the first point of rotation 13 relative to support 50, relative to which basic orientation the first pivoting movement and second pivoting movement are performed. In this case the support 50 is formed by the platform or chassis 46 of agricultural machine 41. The path R3 of the rotation of the first point of rotation 13 brought about by the adjustment is designated.

[0126] Adjusting the basic orientation of the first point of rotation 13 may influence the orientation in the folded-out position of the second ladder part 12 relative to a ground G on which support 50 rests directly or indirectly.

[0127] Figure 10C shows a part of an embodiment of a ladder system 100 which is arranged on a schematically shown embodiment of the agricultural machine 141, wherein the ladder system 100 is in the folded-in position. The ladder system 100 is embodied and arranged on agricultural machine 141 such that, in folded-in position, it does not increase the size of the agricultural machine 141 in at least one direction, in this case in the right-hand lateral direction. Ladder system 100 hereby creates no or fewer practical or legal restrictions on movement of agricultural machine 141, for instance when travelling on the public highway, travelling in a small yard or in a barn, or travelling on a partially mowed field. As an example, an agricultural implement 144 of the shown agricultural machine 141 has been removed or folded up in figure 10C but, depending on the embodiment of agricultural machine 141 and the placement of ladder system 100, it is possible to achieve at least some of the advantages without changing the placement of components of agricultural machine 141 other than the ladder system 100 itself.

[0128] If a ladder system 100 is arranged on an agricultural machine 141, it is advantageous to embody the ladder system 100 such that the first ladder part 111 and the second ladder part 112 form in the shown folded-out position a ladder with an overall length of between 1.5 and 5 metres, preferably between 2 and 4 metres.

[0129] In order to configure the ladder system 100 for use by persons, the materials, dimensions, connections and actuators will have to take a form such that the first ladder part or the second ladder part can be loaded, in any case in the folded-out position, with the weight of a person. This can be based on users up to a determined maximum weight, for instance a weight of 160 kg. Embodying at least the rungs 102, longitudinal parts 103, mounting means 105 of the ladder system from metal, for instance steel, is preferred.

[0130] It is advantageous for the ladder system 100 to be configured to also be able to withstand loading with the weight of a person when moving between the folded-out state and the folded-in state, and / or vice versa. This prevents accidents from occurring and / or parts from becoming damaged in that it reduces the risk of the ladder system moving in an unexpected or uncontrollable manner when the movement of the ladder system is inadvertently started while a user is still standing on the ladder system.

[0131] It is further advantageous for the ladder system to be configured to perform the first pivoting movement and second pivoting movement continuously if the load during these rotations fluctuates by the weight of a person, for instance if a person steps onto or off the first ladder part 111 or second ladder part 112, for instance a person with a weight of 160 kg. This prevents accidents from occurring and / or parts from becoming damaged in that it reduces the risk of the ladder system moving in an unexpected or uncontrollable manner when someone accidentally steps onto or off the ladder while ladder system 100 is still moving.

[0132] In the second ladder part 112 the above stated risks may be greater since it can be configured to always remain in the same orientation in which it can be set foot on.

[0133] The control means 147 shown in figures 10A-10C comprise an electronic control unit which is arranged on the support 50. The control means 47 can also be arranged on the ladder system 100 itself, or on a further support, or it can be mobile. It is advantageous especially in a ladder system of modular form for the control means 147 to be configured to operate without being arranged on support 50.

[0134] Control means 147 can form part of an electronic device which is also configured for other purposes, for instance a control installation of the driver’s cab 145 or a remote control. The control means 147 can be embodied at least partially as a piece of software, for instance software which can be installed on a general-purpose computer or a mobile phone. It is possible to provide a plurality of control means 147.

[0135] Control means 147 can be configured to control the first pivoting movement, second pivoting movement and / or adjustment. For this purpose the control means can be connected communicatively to one or more actuators of the ladder system 100. Control means 147 can be connected to the ladder system for wired or wireless communication. For this purpose an electronic communication element 148 can be provided in or on the ladder system. In combination with a wireless connection, it is extra advantageous to embody the control means 147 at least partially as a piece of software. It will be apparent to the skilled person in the field that the above described embodiments are only illustrative examples and that many variations of the above described components, devices, systems and methods are possible within the scope of the claims, wherein at least some of the described advantages are still achieved.

Claims

CLAIMS1. Ladder system (100) for an agricultural machine, particularly a processing machine, the ladder system comprising a ladder pivotally mountable on a support of an agricultural machine, wherein the ladder is movable between at least a folded-in position and a folded-out position, the ladder comprising:- a first ladder part (111) comprising a number of ladder rungs;- a second ladder part (112) comprising a number of ladder rungs;- a first pivoting element (113) arrangeable between the support of the agricultural machine and the first ladder part for the purpose of mounting the first ladder part pivotally on the support;- a second pivoting element (115) arranged between the first ladder part and the second ladder part for the purpose of mounting the second ladder part pivotally on the first ladder part;- a drive (130) configured to drive a first pivoting movement of the first ladder part relative to the support;- coupling means (138) configured to provide for a mechanical coupling between the first pivoting element and the second pivoting element for the purpose of transmitting the first pivoting movement of the first ladder part relative to the support to a second pivoting movement of the first ladder part relative to the second ladder part, wherein the coupling means (138) are configured to hold the second ladder part in substantially the same orientation, preferably a downward orientation relative to the agricultural machine, during the movement between the folded-in and folded-out position of the ladder.

2. Ladder system according to claim 1, wherein the coupling means are configured to determine the position of the second ladder part relative to the first ladder part during pivoting.

3. Ladder system according to claim 1 or 2, wherein the coupling means comprise a coupling element (135) which extends between the first and second pivoting element and which is configured to couple the first pivoting movement of the first engaging element (133) relative to the first ladder part (111) to the second pivoting movement of the second engaging element (134).

4. Ladder system according to claim 1, 2 or 3, wherein the coupling means (138) comprise:- a first engaging element (133), for instance a first toothed wheel;- a second engaging element (134), for instance a second toothed wheel; and- an elongate, flexible coupling element (135), for instance a chain or belt, guided round the engaging elements (133, 134) in the manner of a loop.

5. Ladder system according to any one of the foregoing claims, wherein the coupling means are coupled to both the first pivoting element and the second pivoting element, and are configured to transmit the pivoting of the first ladder part to a pivoting of the second ladder part in a predetermined ratio.

6. Ladder system according to claim 5, wherein the predetermined ratio is irrespective of forces exerted on the ladder parts.

7. Ladder system according to any one of the foregoing claims, wherein the coupling means (138) are configured to prevent the second ladder part (112) from undergoing a second pivoting movement relative to the first ladder part (111) if this second pivoting movement is not brought about by the coupling means (138).

8. Ladder system according to any one of the foregoing claims, wherein the coupling means are configured to make the second ladder element pivot simultaneously to pivoting of the first ladder element.

9. Ladder system according to claim 8, wherein the coupling means are configured to achieve that, when the first ladder part undergoes a first pivoting movement relative to the support, the second ladder part simultaneously undergoes a second pivoting movement relative to the first ladder part.

10. Ladder system according to any one of the foregoing claims, wherein the first pivoting movement and the second pivoting movement are opposite to each other.

11. Ladder system according to claim 2, wherein the coupling means are configured to pivot the first ladder part between a substantially upward orientation and a substantially downward orientation, wherein the second ladder part remains oriented substantially downward, during the movement between the folded-in and folded-out position of the ladder.

12. Ladder system according to any one of the foregoing claims, wherein in a wholly folded-out position the first ladder part and the second ladder part extend mutually in line or extend obliquely relative to each other, preferably at an angle of between 10 degrees and 50 degrees, more preferably between 15 degrees and 30 degrees.

13. Ladder system according to any one of the foregoing claims, wherein in a wholly folded-in position the first ladder part and the second ladder part extend substantially adjacently of each other and / or parallel relative to each other.

14. Ladder system according to any one of the foregoing claims, wherein the coupling means comprise:- a first engaging element mounted at a fixed distance relative to the support and arranged clear of the pivoting movement of the first pivoting element;- a second engaging element mounted fixedly on the second pivoting element;- a coupling element guided round the first engaging element and round the second engaging element, wherein the coupling element is embodied to pivot along with the first pivoting movement of the first ladder part.

15. Ladder system according to any one of the foregoing claims, wherein the coupling means comprise:- a first engaging element mounted at a fixed distance relative to the support and arranged clear of the pivoting movement of the first pivoting element, wherein the first engaging element comprises a first pulley or first toothed wheel;- a second engaging element mounted fixedly on the second pivoting element, wherein the second engaging element comprises a second pulley or second toothed wheel;- a coupling element guided round the first pulley or the first toothed wheel and round the second pulley or second toothed wheel, wherein the coupling element respectively comprises a string or belt or comprises a chain.

16. Ladder system according to claim 14 or 15, wherein the coupling element is configured to transmit the relative rotation of the first engaging element and the first pivoting element to a corresponding relative rotation of the first ladder part and the second pivoting element during folding in or folding out.

17. Ladder system according to claim 16, wherein the coupling element is configured to transmit the relative rotation of the first engaging element and the first pivoting element to an identical relative rotation of the first ladder part and the second pivoting element during folding in or folding out.

18. Ladder system according to any one of the foregoing claims, wherein the first pivoting element is fixated relative to the first ladder part and the second pivoting element is fixated relative to the second ladder part.

19. Ladder system according to any one of the foregoing claims, wherein the first engaging element is arranged on a bush arranged round the first pivoting element and freely rotatable relative thereto and wherein the bush is mounted on the support via one or more (reaction) rods.

20. Ladder system according to any one of the foregoing claims, further comprising adjusting means for adjusting the orientation of the first ladder part relative to the support in the folded-in position.

21. Ladder system according to claims 19-20, wherein the rods take a length-adjustable form for the purpose of forming adjusting means.

22. Ladder system according to any one of the foregoing claims, wherein the coupling means are provided on either side of the ladder.

23. Ladder system according to any one of the foregoing claims, wherein the drive comprises an actuator, for instance a hydraulic and / or an electric actuator.

24. Ladder system according to claim 23, wherein the actuator is a linear actuator or a rotatable actuator.

25. Ladder system according to any one of the foregoing claims, wherein the first ladder part and the second ladder part form in the folded-out position a ladder with an overall length of between 1.5 and 5 metres, preferably between 2 and 4 metres.

26. Ladder system according to any one of the foregoing claims, which is configured to perform the first pivoting movement and second pivoting movement while the first ladder part and / or the second ladder part is loaded with the weight of a person, for instance a weight of 160 kg.

27. Ladder system according to any one of the foregoing claims, which is configured to perform the first pivoting movement and second pivoting movement continuously if the load during these rotations fluctuates by the weight of a person, for instance if a person steps onto or off the first ladder part or second ladder part, for instance a person with a weight of 160 kg.

28. Ladder system according to any one of the foregoing claims, further comprising control means for controlling the first pivoting movement, second pivoting movement and / or adjusting means, for instance comprising an electronic control unit connected in wired or wireless manner to one or more actuators.

29. Ladder system according to any one of the foregoing claims, wherein the ladder is configured to provide access to a driver's cab of the agricultural machine, for instance a processing machine for processing fibre plants.

30. Agricultural machine, particularly a processing machine, provided with at least one ladder system according to any one of the foregoing claims.

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