Abstract:
An agricultural round baler is described. The agricultural round baler comprises a holding and supplying device for crops, a pressing chamber with pressing elements for pressing the crops, and a wrapping or binding device for the wrapping or binding of a pressed round bale. In order to design a round bale production which is, as a whole, more productive, the proposal is made that it be possible for at least the pressing elements to be operated, during a wrapping or binding operation following a pressing operation, at a higher running speed than the speed during the pressing operation.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    Pursuant to 35 USC §119, this application claims the benefit of and priority to German patent application no. 102014200449.7, filed on Jan. 13, 2014, which is herein incorporated by reference in its entirety. 
       FIELD OF THE DISCLOSURE 
       [0002]    The invention concerns an agricultural round baler, with a holding and supplying device for crops, a pressing chamber with pressing elements for the pressing of crops, and a wrapping or binding device for the wrapping or binding of a pressed round bale. 
       BACKGROUND 
       [0003]    Agricultural round balers are known. Via a holding and supplying unit, mowed crops, lying on the ground, are conducted into a pressing chamber of the round baler. The pressing chamber has pressing elements in the form of rollers, straps, or chain elements, via which crops conveyed into the pressing chamber are shaped, in a known manner, into a round bale. The actual pressing operation is followed by a wrapping or binding operation, in which the formed or pressed round bale is wrapped or bound with a mesh, a film, or a yarn as soon as the round bale has attained a desired or predetermined size. The holding and supplying unit and the driving of the pressing elements are generally operated via a centrally located gear, which is driven by a joint drive shaft of a towing vehicle, for example, the power-take-off shaft of a tractor or agricultural towing vehicle, or a drive shaft on a self-propelled round baler. The gear operates a first drive train for the holding and supplying device and another drive train for the pressing elements. Instead, parallel drives for each of the drive trains can be provided on the gear. The drive trains, however, can be situated in a row, one after the other, and are driven with only one driven unit of the gear. During the wrapping or binding operation, the holding and supplying of crops is generally interrupted because travelling over the field is interrupted, so the round baling process stops and additional crops are not taken up. After the wrapping or binding operation is ended, the finished round bale is ejected and travelling to take up additional crops is again undertaken so that a new pressing operation can be introduced. The entire round bale production process is, accordingly, composed of the pressing operation, the wrapping or binding operation, and the ejection of the finished round bale, wherein a not inconsiderable amount of time must be expended for the wrapping or binding operation and for the ejection of the round bale, or in other words, the work time and thus the productivity during the round bale production can be decisively influenced by the wrapping and binding operation and by the ejection. 
       SUMMARY 
       [0004]    The goal that is the basis of the invention is to be found in that an agricultural round bale press of the type mentioned in the beginning is to be indicated, by means of which a productivity increase during the round bale production can be attained. 
         [0005]    The goal in accordance with the invention is attained by the teaching of Claims  1  and  7 . Other advantageous development and refinements of the invention can be deduced from the subclaims. 
         [0006]    In accordance with the invention, an agricultural round bale press of the type mentioned in the beginning is designed in such a way that the pressing elements can be operated at a higher running speed during one of the wrapping or binding operations that follow a pressing operation than during the pressing operation itself. By operating the pressing elements at a higher running speed after the pressing operation is concluded or when the wrapping or binding operation is introduced, the round bale accordingly rotates faster during the wrapping and binding operation than it did before. In this way, the mesh or the film or the yarn is wrapped or bound around the bale at a correspondingly higher rotational speed of the round bale, wherein the wrapping or binding operation is decisively shortened. The winding or binding operation can hereby be carried out, for example, at double the running speed of the pressing elements, which can shorten the wrapping and binding operation by several seconds. This, in turn, signifies a clearly productive speeding up of the entire round bale production process. 
         [0007]    The round baler can comprise a first drive train to drive the holding and supplying device and a second drive train to drive the pressing elements, wherein a higher running speed of the pressing elements can be attained during the wrapping or binding operation by a change of a drive transmission in the second drive train. For such a change of the drive transmission, a variable drive transmission designed with at least two switching stages can be used. Thus, for example, a two- or multiple-speed toothed wheel gear, a planetary gear, or even a variable belt drive can be used. Also, drives via an electric motor or a hydraulic motor are conceivable, which are variable in their rpm and can be situated parallel to the first drive train. 
         [0008]    In another embodiment, the round baler can comprise a gear arrangement with a first driven unit for a first drive train to drive the holding and supplying device, and a second driven unit for a second drive train to drive the pressing elements, wherein a higher running speed of the pressing elements during the wrapping or binding operation can be attained by a change of a drive transmission in the gear arrangement or in the second drive train. Here, for example, one can proceed from a drive device in the form of a variable transfer gearbox whose drive shaft or input shaft, for example, are directly connected with the power take-off shaft of a towing vehicle and which has a first and a second driven unit in the form of a first and second output shaft, which, in accordance with the drive, provides the first or the second drive train. Then, as was already described above for the change of a drive transmission in the second drive train, the second drive train alone can be varied in accordance with the drive, so that during a wrapping or binding operation, the second drive train is driven at a higher rpm, wherein a variable transmission unit of any type, designed with at least two switching stages, is located, in accordance with the drive, behind the used transfer gearbox in the second drive train. It is possible, furthermore, to provide the used transfer gearbox with an integrated switching stage for the second driven unit, so that by means of a switching operation, the rpm of the second drive unit can be increased, whereas the first driven unit continues to run at an unchanged rpm, or in connection with the integrated switching stage or in some other way is even stopped. The change of the drive transmission in the second drive train can also be attained in that both drive trains are driven by a variable drive device in the form of a variable transfer gearbox with a first and a second driven unit, such that with the change of a drive transmission of the transfer gearbox, both the drive transmission for the first as well as for the second driven unit takes place jointly and thus an rpm increase is attained in the first as well as in the second drive train. The holding and supplying device, coupled with the first drive train, is then likewise driven at a higher rpm, which would not be advantageous with regard to wear and tear and energy loss, since the round baler is stopped during the wrapping or binding operation and thus the holding and supplying device runs on site without being productive. In the overall consideration for such a combined arrangement of the drives for the first and second drive trains, this alternative, however, can also prove to be low-cost and thus, in the end effect, also more economical, since the gear arrangement itself is possibly constructed in a simpler manner and at a lower cost. In order to avoid driving the two drive trains at a higher rpm, a coupling, for example, can also be provided, which, on the driven side of the first driven unit, is provided in the first drive train, and in the case of an overall increase of the number of gears for the gear arrangement it is opened so as to decouple the first drive train at an increased rpm from the first driven unit, so that although the first driven unit is likewise operated at an increased rpm, the first drive train, which can be coupled thereon, is decoupled from it. 
         [0009]    The aforementioned gear arrangement can be designed as a planetary gear, which, for example, has a drive via a sun wheel, a first driven unit via a ring wheel, and a second driven gear via a planetary carrier of the planetary gear, wherein a changeable drive transmission can be attained by blocking or braking a driven unit component. As a driven unit component, one can, for example, use the ring wheel or the planetary carrier of the planetary gear if the drive is carried out via the sun wheel. For example, by blocking or braking the ring wheel, which can be connected with the first drive train, the second driven unit, which is connected with the planetary carrier, can be operated in a drive transmission at a higher rpm during the wrapping or binding operation. Depending on the design of the drive and driven unit conditions or specifications for the round baler, the drive and driven units can also be placed in another arrangement on the planetary gear. Independent of the blocking or braking of a driven unit component of the planetary gear, the possibility exists here, as well as in other combination examples, of decoupling the first drive train during a wrapping or binding operation by the placement of a coupling from the first driven train, so that the holding and supplying unit is not operated or is stopped during the wrapping or binding operation. 
         [0010]    Furthermore, it is possible for the gear arrangement to comprise a differential gear with a differential lock, wherein a changeable drive transmission can be attained by cancelling the differential lock in connection with a drive lock or a drive brake on the first drive unit or on the first drive train. The drive lock or the drive brake can be located thereby within a differential gear housing or also outside the differential gear housing. By the shape and design of a differential lock in the differential gear, which are, in fact, known, the first and second driven units can be brought directly in connection with one another by activating the differential lock, wherein a differential movement between the first and second drive units is stopped or blocked. With an activated differential lock, there is a uniform and simultaneous output via the two driven units. In just the opposite manner, the direct connection between the first and the second driven units can be cancelled by deactivation or loosening of the differential lock, so that differential movements are permitted. With a deactivated differential lock, it is possible to absorb a differential movement of the two driven units, that is, different rpms, with the differential gear so that, for example, one of the driven units can be blocked or braked, whereas the other driven unit continues to rotate at a changed rpm. Thus, for example, by blocking or braking the first drive connection or the thus connected first driven unit, a change of the drive transmission for the second drive train can be attained if the differential lock is simultaneously cancelled or deactivated. 
         [0011]    Furthermore, a method for the production of round bales with an agricultural round baler is proposed, which is the basis for the embodiments described above, wherein, following a pressing operation, at least the pressing elements are operated at a higher running speed during a wrapping or binding operation than the speed of the pressing operation. 
         [0012]    With the aid of the drawing, which shows an embodiment example of the invention, the invention and additional advantages and advantageous refinements and developments are described in more detail and explained below. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]    The figures show the following: 
           [0014]      FIG. 1 , a schematic lateral view of a round baler; 
           [0015]      FIG. 2 , a schematic diagram for another embodiment of a drive arrangement for a round baler in accordance with  FIG. 1 , with a gear arrangement with a transfer gearbox; 
           [0016]      FIG. 3 , a schematic diagram for another embodiment of a drive arrangement for a round baler in accordance with  FIG. 1 , with a gear arrangement with transfer gearboxes and a transmission stage in a drive train; 
           [0017]      FIG. 4 , a schematic diagram for another embodiment of a drive arrangement for a round baler in accordance with  FIG. 1 , with a gear arrangement with planetary gears; and 
           [0018]      FIG. 5 , a schematic diagram for another embodiment of a drive arrangement for a round baler in accordance with  FIG. 1 , with a gear arrangement with a differential gear. 
       
    
    
     DETAILED DESCRIPTION 
       [0019]    A round baler  10 , schematically shown in  FIG. 1 , comprises a first housing part  12 , which is supported on a base  15  by means of wheels  14 , and which can be connected by means of a towing bar  16  to a towing vehicle (not depicted), for example, a farm tractor. 
         [0020]    On the front, lower side of the first housing part  12 , in the forward direction, there is situated, in a known manner, a holding and supplying device  18  for crops, and the front part of a baler space  20  is formed in the first housing part  12 . On the rear, upper corner area of the first housing part  12 , is situated a support  22  for a swiveling second housing part  24 , which surrounds a rear part of the baler space  20 . The second housing part  24  uncovers, when open, an outlet  26 , by means of which a bale  28 , pressed by the round baler, can be deposited or unloaded. The swiveling second housing part  24  can be actuated (opened and closed) by means of servomotors (not depicted) and is a discharge chute for a bale  28  pressed in the baler space  20 . The bale  28  is thereby moved in the direction of the outlet  26  and thereby rolls onto a rolling-off or unloading ramp  30 , via which the bale  28  can be conducted to the ground  15 . 
         [0021]    The round baler  10 , designed with a size-changing baler space  20 , contains a number of pressing elements, running parallel to one another, to press crops in the shape of pressing rollers  32  (by way of example, only a few pressing rollers  32  were provided with the reference symbol “ 32 ” here), whose rotation axes  34  are placed, with a closed second housing part  24 , on a circular arc, and of which at least a few are driven. Alternatively, the round baler  10  can also be designed in a known manner as such, with a size-changing baler space  20  or as a baler with a variable baler  20 , wherein the pressing elements can then likewise be designed in a known manner as belts, straps, or chain arrangements (not depicted). 
         [0022]    The round baler  10  also has a drive arrangement  36  with a gear arrangement  37 , a first drive train  38 , and a second drive train  40 . A drive shaft  42  can be connected with a power take-off shaft (not depicted) of the towing vehicle or tractor and serves as a drive  44  for the drive arrangement  36 . The first drive train  38  is connected, via a first drive unit  46 , and the second drive train  40  is connected, via a second driven unit  48  of the gear arrangement  37 , with it in the drive connection. The first drive train  38  drives the holding and supplying device  18 , wherein the second drive train  40  is provided to drive the pressing rollers  32 . The drive trains  38 ,  40  comprise all drive components which are situated in a known manner in round balers to drive the holding and supplying device  18  or to drive the pressing elements and, on the drive side, are connected with the first drive unit  46  or the second driven unit  48  of the gear arrangement  37 . 
         [0023]    Furthermore, the round baler  10  comprises a wrapping device  50 , which is equipped with a mesh or film roll  52  as a wrapping material. The wrapping device  50  comprises a wrapping material supply  54 , which conducts the wrapping material from the mesh or film roll  52  into the baler space  20 . Instead of a wrapping device  50 , a binding device (not depicted) with binding yarn can also be used, likewise in a known manner. 
         [0024]    During a normal pressing operation, the first and the second drive trains  38 ,  40  are driven in parallel via the gear arrangement  37  or via the drive  44  and the driven units  46 ,  48 , so that the holding and supplying device  18  and also the pressing elements  32  are maintained in operation at the same time and at a constant rpm ratio. After the actual pressing operation, that is, the take up of the crops and the formation of the round bale  28  by the pressing rollers  32  has been concluded, travelling over the ground  15  is interrupted, since the round baler  10  is filled with the round bale  28  and no more crops are to be taken up or can be taken up in the baler space  20 . At this time, the wrapping device  50  is also activated and a wrapping or binding operation is introduced following the pressing operation. The wrapping material is thereby wrapped around the round bale  20  by a continuous rotation of the round bale found in the baler space  20 . After a wrapping operation has been concluded, the round bale is released to the ground  15  via the unloading ramp  30 , by opening the discharge chute  24 . Then, travelling with the round baler  10  is again taken up and a new pressing operation begins. The rpm of the holding and supplying device  18  is usually constant during the picking up of the crops, and the travelling speed of the round baler  10  is adapted so as not to pick up too large nor too small an amount of crops for an optimal crop pickup. The crop pickup is, moreover, also limited by construction features of the press and by the dimensions of a crop inlet. In other words, the holding and supplying device  18  cannot convey crops at an arbitrarily fast rate, since the result could be clogging of the conveying channel of the round baler  10 . Nevertheless, in order to increase the productivity of the round baler  10  in comparison to traditional balers, it is possible in the case of the round baler  10  designed here to operate the pressing elements or pressing rollers  32  at higher running speeds during the wrapping or binding operation. If we are dealing with a round baler  10  with a variable baler space  20 , the belts, straps, or chain arrangements would be correspondingly operated at a higher running speed. The result would be that during the wrapping or binding operation, the finished round bale  20  is turned or rotated at a higher speed in comparison to the speed of the pressing operation. In this way, the wrapping or binding material is also wrapped more quickly around the round bale  20  and the wrapping or binding operation can be clearly shortened. Thus, the round bale  20  can also be let out or deposited earlier. In other words, the downtime of the round baler  10  when not travelling over the ground  15  is clearly shortened and the productivity is thus increased. In this way, more round bales  20  per unit time can be moved in. 
         [0025]    In order to now make possible a higher running speed of the pressing elements during a wrapping or binding operation following a pressing operation, various embodiment examples are proposed, which are described in the following, with the aid of schematic representations of the drive arrangement  36  in  FIGS. 2-5 . 
         [0026]    In a first embodiment example, see  FIG. 2 , the round baler  10  is operated with a first drive train  38  to drive the holding and supplying device  18 , and a second drive train  40  to drive the pressing elements, wherein a higher running speed of the pressing elements can be attained during the wrapping or binding operation by a change of the rpm of the second drive train  40 . To this end, the gear arrangement  37  is designed in a first switching stage with a low transmission (A), and in another switching stage with a higher transmission (B) for the first and second driven units  46 ,  48 . Thus, after the pressing operation, switching to the second switching stage can be carried out, and the pressing rollers  32  are operated at a higher speed. Since the first and the second drive trains  38 ,  40  or the first and the second driven units  46 ,  48  are operated in the fixed rpm ratio, the holding and supplying device  18  also turns at a correspondingly higher speed. This is, however, not significant for the round bale-forming process, since the round baler is stationary and does not travel over the ground. After the wrapping or binding process has concluded, the gear arrangement  37  can again be switched to the switching stage with the lower transmission. The switching can take place in a known manner with electric or hydraulic servomotors. Furthermore, a coupling  56  can additionally be provided in the first drive train  38  or on the first driven unit  46 , by means of which the first drive train can be decoupled from the first driven unit  46  of the gear arrangement  37  during the wrapping or binding operation. In this way, the wear and tear of the holding and supplying device  18  can be decisively reduced, since it need not also run during the wrapping or binding operation. 
         [0027]    In another embodiment example, see  FIG. 3 , the gear arrangement  37  is designed as a constant transfer gearbox, without switching stages. Instead, a switching stage with a lower transmission and another switching stage with a high transmission (A/B) are provided in the second drive train  40 , so that in the low switching stage, the first and the second drive trains  38 ,  40  are driven at the same rpm; on the other hand, in the high transmission, the second drive train  40  can be operated at a higher rpm in comparison to the first drive train  38 . Thus, after the pressing operation, switching to the second switching stage can be carried out for the second drive train  40 , and the pressing rollers  32  are operated at a higher speed, where it should be mentioned here that the first drive train  38  is then not operated at a higher speed. As for the rest, the embodiment example in  FIG. 3  is similar to the embodiment example in  FIG. 2 . Furthermore, for the reasons mentioned above, it is also possible to provide a coupling  56  in the first drive train  38  or on the first driven unit  46 , in order to adjust the operation of the first drive train  38  during the wrapping or binding operation. 
         [0028]    In another embodiment example, see  FIG. 4 , the gear arrangement  37  comprises a planetary gear  58  in combination with a lock or braking device  60 . The planetary gear  58  is designed in such a way that a sun wheel  62  is connected with the drive  44 , and the first driven unit  46  is operated via a ring wheel  64 , and the second driven unit  48 , via a planetary carrier  66 . The lock or braking device  60  is connected with the first driven unit  46  in the embodiment example shown in  FIG. 4 , wherein the ring wheel  64  can be locked or braked. With a locked or braked ring wheel  64 , the rpm of the planetary carrier  66  is increased, so that the first drive train  38  is stopped or operated at a lower rpm and, simultaneously, the second drive train  40  is operated with a correspondingly higher rpm. The lock or braking device  60  can alternatively also be located in the first drive train  38  or directly on the ring wheel  64 . As described also for the preceding embodiment example, it is possible here to decouple the first drive train  38  from the first driven unit  46  during a wrapping or binding operation by the placement of a coupling  56 , so that the holding and supplying device  18  is not operated or is stopped during the wrapping or binding operation. In such a case, the lock or braking device  60  would be located between the planetary gear  58  and the first drive train  38 . 
         [0029]    In another embodiment example, see  FIG. 5 , the gear arrangement  37  comprises a differential gear  68  with an integrated differential lock  69 , in combination with a lock or braking device  70  for the first drive train  38  or the first driven unit  46 . The differential gear  68  is designed in such a manner that with an activated differential lock  69  in a type and manner which are known for a differential gear  68 , a uniform drive distribution is carried out to the first and second driven units  46 ,  48 . With a deactivated differential lock  69 , corresponding to a type and manner likewise known for a differential gear, which is aimed at the driven unit torques or driven units rpm acting on the driven units  46 ,  48 , so that, for example, with a first drive train  38  or the first driven unit  46 , blocked by the lock or the braking device  70 , a drive flow takes place, as a whole or increased, via the second drive train  40  or the second driven unit  48 , at a correspondingly higher rpm. Accordingly, the lock or braking device  70  in the embodiment example shown in  FIG. 5  is connected with the first driven unit  46  or with the first drive train  38 . 
         [0030]    Even if the invention was described with the aid of only a few selected embodiment examples, many diverse alternatives, modifications, and variants that fall under the invention under consideration become accessible for the specialist in light of the preceding description and the drawing.