Abstract:
A large round baler is provided with a wrapping arrangement which supplies wrapping material to a baling chamber inlet at a location above the floor of a baling chamber. The wrapping arrangement includes a wrapping material supply roll positioned at, or in frictional contact with, a feed roll, which conveys the wrapping material and delivers it such that it gravitates downwardly through a gap provided between an anvil and movable part of a cut-off device, the cut-off device being located at the inlet to the baling chamber so that the gravitating material passes into the baling chamber where it is caught between the formed bale and a rotatable bale-forming device which delimits at least a portion of the circumference of the baling chamber.

Description:
FIELD OF THE INVENTION 
     The invention concerns a large round baler with a baling chamber, at least one bale-forming device surrounding the baling chamber around its circumference, a wrapping arrangement and a wrapping material inlet opening in the enclosure of the baling chamber extending through the bale-forming device above the floor of the baling chamber. 
     BACKGROUND OF THE INVENTION 
     A large round baler is known from U.S. Pat. No. 5,581,973 in whose forward region a wrapping arrangement is provided with which, for example, a net drawn from a roll can be introduced between a bale-forming roll and a deflecting roll into a baling chamber by means of a supply arrangement. The supply arrangement contains jaws that can be repositioned by a motor into which the wrapping material is clamped and on whose forward side a remaining piece hangs, that can be brought into engagement with the bale formed in the baling chamber and rotated there. The supply arrangement represents a considerable construction cost. 
     DE-A-34 18 681 also shows a large round baler with a wrapping arrangement attached to its forward side in which a wrapping material roll is accommodated in the forward upper corner region and two supply rolls are located between two bale-forming rolls that draw the wrapping material between them and conduct it to the baling chamber. A sharply inclined guide vane extends between the wrapping material roll and the supply rolls. These supply rolls also lead to a considerable construction cost. 
     According to WO-A-97/05767 a wrapping material roll is moved vertically in order to come into contact with the rotating bale which grasps and carries along the wrapping material that is also conveyed by a guide vane. The wrapping material is conducted together with the crop to be baled through a slot at the floor of the baling chamber and is inserted in this way between two layers of crop to be baled, which however, reduces the retaining force of adjoining net layers. 
     According to U.S. Pat. No. 5,974,764 a wrapping material roll rests on an upper of two supply or feed rolls, is brought into rotation by these during the wrapping process, and is braked relative to the rotating bale. The wrapping material is drawn between the two supply rolls and conducted to a carry-along arrangement that delivers it to an inlet opening provided at the floor of the baling chamber for the harvested crop. The supply rolls and the carry-along arrangement represent a considerable construction cost. 
     The problem underlying the invention is seen in the need to propose a wrapping arrangement that provides a reliable supply of wrapping material with low construction cost and construction space. 
     SUMMARY OF THE INVENTION 
     According to the present invention, there is provided an improved wrapping arrangement for delivering wrapping material into a baling chamber. 
     An object of the invention is to provide a wrapping arrangement which reliably delivers wrapping material to a baling chamber and is of a compact, low cost construction. 
     A more specific object of the invention is to provide a wrapping arrangement which includes a selectively driven roll located at an inlet for introducing wrapping material into the baling chamber, with a wrapping material supply roll being mounted for movement into engagement with the driven roll, so as to cause the wrapping material to unwrap from the supply roll and gravitate through the inlet. 
     In this way, no additional conveying or supply arrangement for the wrapping material is required; rather, it falls under the force of gravity into the baling chamber that is located at least partially underneath it. Two supply rolls are not required, since the wrapping material is in contact with the one supply roll, and it is carried along on the basis of this contact. The wrapping arrangement may be arranged at the forward side as well as the rear side of the large round baler, which depends on the direction of rotation of the bale or of the bale-forming device. The bale-forming device can be formed by a single wide band, by a multitude of belts, or if necessary, several sets of belts, by a bar chain conveyor or by a combination of these. Since the wrapping material inlet opening, the roll, and the wrapping material roll follow each other closely, the result is a compact configuration. 
     The construction arrangement can be configured with even less construction cost and space if the roll conveying the wrapping material is simultaneously a part of the bale-forming device. For example, a bale-forming roll or one or more belts draws or draw the wrapping material into the baling chamber. In this embodiment, the tension of the wrapping material upon the bale is applied by a separate brake that acts, for example, on the wrapping material roll, and if necessary, is controlled so that the wrapping material can be easily grasped by the bale and carried along at the beginning of the wrapping process. Since the carrier is adjustable, the wrapping material can be brought into contact with the bale-forming device that otherwise is still rotating only if a wrapping process is actually to be performed. 
     Alternatively, the roll is separated from the bale-forming device, always remains in its position, and is only driven during the wrapping operation. While it would be possible to drive the roll, for example, with an electric or hydraulic motor, since the bale-forming device or devices are driven anyway during the wrapping process, a simplification of the construction can then occur if the drive of the roll is taken from the bale-forming device. The drive so derived is then preferably geared down, so that to maintain the tension in the wrapping material, the bale rotates more rapidly than the supply of the wrapping material. 
     It is possible to brake the wrapping material roll in a known manner with a brake acting upon the core of the roll. It is technically simpler, however, to let the wrapping material roll with its weight rest upon a carrier, be in contact with a wall or the like. The carrier and/or the wall may be provided with a high-friction coating or a profile in order to increase the braking force. 
     Although the wrapping material reaches directly into the baling chamber on the basis of its own weight, the kinetic energy of the roll, however, could initially bring the wrapping material into an undesirable track. With a guide vane—straight or curved—the wrapping material is conducted directly and safely into the wrapping material inlet opening. In place of a sheet metal guide vane, plastic or wood, or the like could also be used. 
     Although it has variously been proposed to make wrapping material available in pre-cut lengths, it is nevertheless considerably more effective to withdraw wrapping material for a multitude of bales from a wrapping material roll and to cut it by means of a corresponding arrangement according to the demand. Such a cutting arrangement is advantageous particularly for large round balers with a variable baling chamber since the demand there for wrapping material varies with the size of the bale. 
     A pressure roll loaded by a force that generally engages the wrapping material roll diametrically opposite the roll, has the result on the one hand that a certain tension is built up in the wrapping material, and on the other hand, a durable contact of the wrapping material roll on the roll is provided, particularly during rough operation on a field. 
     In any case, when the roll is enclosed by the wrapping material for approximately half of its circumference, the frictional force between the two is normally large enough to assure conveying on the one hand and a tension on the other hand. 
     A covering has the advantage that the wrapping arrangement is protected as much as possible from environmental hazards. If in addition, the pressure roll or a contact force arrangement is attached to the covering and can be repositioned together with it, the path for the exchange of a wrapping material roll can be opened simultaneously when the covering is raised or pivoted away. 
     A stable bearing support for the wrapping material roll can be attained easily by the provision of a contact force arrangement that acts upon the pressure roll that is in contact with the wrapping material roll on the one hand, and that is supported on the other hand, on the covering. The loading, that is, the dimensioning of the force applied to the force member, can be controlled. The force member can be loaded, for example, by a gas spring, a compression spring or extension spring, or the like. 
     If the force member crosses a dead center position, it can, on the one hand, thereby bring the covering into the closed position and the pressure roll in the contact force position, and on the other, hand bring both into the open position or the raised position where the position is taken up by the force stored in the force member. 
     If the wrapping arrangement is configured wider than the baling chamber and guide vanes or slots are provided downstream of the roll, in order to guide the wrapping material to the end faces of a bale being formed in the baling chamber, if necessary, by means of a spreader arrangement, then the bale is covered not only on its circumference, but also over its edges and partially on its end faces. In a bale formed of silage, the influence of air is thereby reduced, among other factors, whereby the quality of forage is improved. 
     The use of a deflector creates a free space between the bale and the side wall, into which the region of the wrapping material can escape that is to be applied later to the end faces. This deflector may be a simple plate, a shape applied to the side wall, or the like, that extends radially by at least the thickness of the wrapping material from the side wall to the interior. 
     The advantage of a deflector spaced away from the side wall lies in the fact that the wrapping material can be applied before its entry into the baling chamber and is carried along by the bale without any problems. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The drawing shows several embodiments of the invention that shall be described in greater detail in the following. 
     FIG. 1 is a schematic right side view of a large round baler equipped with a wrapping arrangement, constructed according to a first embodiment, an shown in an operating position. 
     FIG. 2 shows the wrapping arrangement of FIG. 1 in an enlarged view with a cutting arrangement and in a charging condition. 
     FIG. 3 shows a wrapping arrangement, constructed according to a second embodiment, including a guide vane and a modified cutting arrangement. 
     FIG. 3 a  shows a wrapping arrangement, constructed according to a third embodiment, wherein one of the bale-forming rolls is used as a feed roll for the wrapping material. 
     FIG. 4 shows a wrapping arrangement, constructed according to a fourth embodiment, including a guide roll and the modified cutting arrangement according to FIG.  3 . 
     FIG. 5 shows a wrapping arrangement, constructed according to a fifth embodiment, including a possible support arrangement for two wrapping material rolls in a slightly inclined disposition. 
     FIG. 6 shows a wrapping arrangement, constructed according to a sixth embodiment, including a possible support arrangement for two wrapping material rolls in an essentially horizontal disposition. 
     FIG. 7 shows a wrapping arrangement, constructed according to a seventh embodiment, including a possible support arrangement for two wrapping material rolls located one above the other. 
     FIG. 8 is a front view of a wrapping arrangement of FIG. 1, for a wrapping material that is wider than a cylindrical bale produced in the large round bale, and including a guide arrangement for the wrapping material. 
     FIG. 9 is a side view of the wrapping arrangement of FIG.  8 . 
     FIG. 10 is view similar to that of FIG. 8, but showing a slot in a side wall of the baling chamber next to the guide arrangement. 
     FIG. 11 is a side view of the wrapping arrangement of FIG.  10 . 
     FIG. 12 is a side view of the wrapping arrangement according to FIG. 1 constructed for delivering a wrapping material that is wider than the bale produced by the large round baler and including a deflector. 
     FIG. 12 a  is a plan view of a cross section through the side wall in the region of the deflector shown in FIG.  12 . 
     FIG. 13 is a side view of the wrapping arrangement according to FIG. 1 constructed for delivering a wrapping material that is wider than a bale produced in the large round baler, and including an inlet channel formed in the baling chamber side wall for receiving the wrapping material. 
     FIG. 13 a  is horizontal sectional view taken along line  13   a - 13   a  of FIG.  13 . 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A large round baler  10 , shown schematically in FIG. 1, includes, among other items, a chassis  12 , wheels  14 , a towbar  16 , bale-forming devices  18 , a baling chamber  20 , a crop pick-up arrangement  22 , a conveyor  24 , and a wrapping arrangement  26 . 
     The large round baler  10  is used to take up harvested crop lying on the ground and form the crop into a bale, particularly a cylindrical bale, as is known in itself. Indeed, it can also be used to bale commercial goods, such as cloth, garbage, foil, etc. 
     The chassis  12  is formed by a bolted and/or welded assembly, not shown, at whose underside an axle, not shown, is located that accepts the wheels  14 . A towbar  16  is connected to the front of, and side walls  28  are carried at opposite sides of, the chassis  12 . 
     The wheels  14  support the large round baler on the ground and its movement, particularly over a field, on which the crop to be baled has been deposited. 
     With the towbar  16 , the large round baler  10  can be coupled to a towing vehicle, not shown, for example, an agricultural tractor. 
     In the following, the term “bale-forming device”  18  is used as an overall concept for all conceivable configurations, in single or multiple units. In this embodiment, the bale-forming device  18  is configured as a multitude of bale-forming rolls  30 , whose axes of rotation extend parallel to each other and are located on a circle arc. 
     Except for a wrapping material inlet opening  32  and a harvested crop inlet opening  34 , the bale-forming rolls  30  enclose the baling chamber  20  on its circumference substantially completely. As seen in FIG. 1, and with reference to the hands of a clock, the wrapping material inlet opening  32  is located approximately at a 1:30 o&#39;clock position and the harvested crop inlet opening  34  at a 4:30 o&#39;clock position. As seen in the circumferential direction, the width of the wrapping material inlet opening  32  corresponds approximately to the diameter of a bale-forming roll  30  and the width of the harvested crop inlet opening  34  approximately to that of one-and-one-half bale-forming rolls  30 . The position of the wrapping material inlet opening  32  can be varied as long as it is located above the floor of the baling chamber  20  and the adjoining next lower bale-forming roll  30  rotates downward in the baling chamber. In place of this bale-forming device  18 , that is particularly appropriate for a baling chamber  20  with a constant volume, a bale-forming device  18  could also be provided that includes elastic elements, pivoted bale-forming rolls, belts, chains, and the like with which the size of the baling chamber  20  can be configured as variable, as is also known practice. The requirement for the wrapping material inlet opening  32  and the harvested crop inlet opening  34  is not affected by this difference. The bale-forming device  18  is brought into rotation by means, not shown, for example, by articulated shafts, gearboxes, and chains, so that, among others, a bale-forming roll  30 , arranged above the wrapping material inlet opening  32 , rotates during the operation and is provided with a driven gear  36  (FIG.  2 ). Indeed, this driven gear  36  could also be provided on another driven component of the large round baler  10 . In this embodiment, the drive of the bale-forming device  18  is performed in such a way that a bale  112  (FIG. 3) rotates in the baling chamber  20  according to the arrow reproduced there. 
     The baling chamber  20  may be of fixed or variable size and is used to accept the crop to be baled and to compress it. In the traditional manner, the baling chamber  20  is divided in the vertical direction into a forward and a rear half, with the forward rear halves connected to each other in an upper bearing  38 , so that the rear half can be raised for the ejection of the bale  112 . 
     The pick-up arrangement  22  takes up harvested crop that has been deposited in a swath on the ground and conducts it, if necessary, by means of the conveyor  24  through the harvested crop inlet opening  34  into the baling chamber  20 . 
     The conveyor  24  may also be configured as a cutting arrangement and is available only selectively. It accepts the crop to be baled from the pick-up arrangement  22 , reduces it if required, and conveys it into the baling chamber  20 . 
     The wrapping arrangement  26  is known in itself for its type and is used to conduct wrapping material  40  into the baling chamber  20  for the finishing of a bale  112 . The wrapping material is grasped by the circumferential surface of the rotating bale  112  and is carried along until it has enclosed the bale  112  and thereby has wrapped it. Accordingly, the wrapping arrangement  26  includes a carrier or support  42 , if necessary, an independent supply or feed arrangement  44 , a cutting arrangement  46 , a contact force arrangement  48 , and possibly a covering  50 . 
     The wrapping material  40  is most often configured as a net, but may also be a foil, and is usually rolled up to form a wrapping material supply roll  52 , as is the case here, for supplying material sufficient for wrapping a multitude of bales  112 . In the embodiments according to FIGS. 1 through 7, the wrapping material  40  is approximately as wide as a bale  112  formed in the baling chamber  20 ; in the embodiments according to FIGS. 8 through 11, the wrapping material  40  is wider than the bale  112  and can also cover a part of the end face in addition to the circumference of the bale. A wrapping material  40 , that is configured in particular as a net, is intended to be fed so that it is clamped between a rotating bale  112  and the inner side of the bale-forming roll  30 , with the stems of the baled crop projecting into the net and aiding the pulling of the net from the supply supply roll  52  until the net is wrapped entirely around the bale  112 . 
     In the embodiments according to FIGS. 1 through 3,  4 , and  8  through  11 , the carrier or support  42  is configured as a plane plate that is essentially horizontal and usually metallic that extends close to the supply or feed arrangement  44  on the side of the baling chamber and ends in a section bent upward on its side facing away from the baling chamber  20 , which is used to secure the position of the wrapping material supply roll  52 . It would also be possible to engage the core of the wrapping material supply roll  52  on an axle or shaft and to support it in bearings in a guide arrangement, free to rotate and slide. Normally the carrier or support  42  extends over the entire width of the baling chamber  20 . 
     In this case, the supply or feed arrangement  44  includes a roll  54  whose diameter is less than that of a bale-forming roll  30  and is located in or at the wrapping material inlet opening  32 . Although the drawing shows a separate roll  54 , it would also be possible to use a bale-forming roll  30  to serve the purpose of the roll  54 . If a roll  30  is used, it would bound the lower side of the wrapping material inlet opening  32  and would require that a brake arrangement for the wrapping material  40  be available. The roll  54  is provided with a drive gear  56  that is aligned with the driven gear  36  and is connected with it over an endless flexible drive element  58 . The circumferential velocity of the roll  54  is always less than that of the bale  112 , so that the wrapping material  40  is deposited under tension on the circumferential surface of the bale  112 . The endless flexible drive element  58  is preferably a belt that can be brought into contact with the drive gear and the driven gear  36  and  56  by means of a tensioning roll  60  with adequate friction force. The roll  54  is provided with a high-friction coating or a profile that assures that the wrapping material  40  is securely conveyed to the wrapping material inlet opening  32 . 
     The cutting arrangement  46  includes an anvil  62 , a shear member  64 , and an actuating arrangement  66 , and is used to separate the wrapping material  40  after the wrapping process into a section located on the bale  112  and a section located on the wrapping material supply roll  52 . 
     The anvil  62  extends over the entire width of the wrapping material  40  and is rigidly retained between the side walls  28 . It provides a straight, sharp edge  68  on which the wrapping material  40  is clamped during the cutting process, and if necessary, brought to the point of tearing. Furthermore, a plate  126  is attached to the anvil  62  that encloses the cutting arrangement  46  towards the baling chamber  20 , in that it essentially bridges the gap between the two adjoining bale-forming rolls  30  which define upper and lower bounds of the wrapping material inlet  32 . 
     The shear member  64  includes a shear rail  70  that is preferably carried at each of its ends by an arm  72  and can be pivoted by means of the actuation arrangement  66  about a bearing  74 . For the cutting process, the shear rail  70  is brought into contact with the anvil  62  so that the stretched wrapping material  40  tears off at its edge and the section connected with the wrapping material supply roll  52  is retained. The arm  72  extends beside the endless flexible drive element  58  and is provided with a retainer  76  for the tensioning roll  60 , with the locations of the arm  72  and retainer  76  being such that the roll  54  is driven or is not driven as a function of the position of the shear rail  70 . In a cutting position, the shear rail  70  is in contact with the anvil  62  and blocks the way for the wrapping material  40  (see FIG.  1 ). On the other hand, in a supply or charging position (see FIG.  2 ), an open passage is created between it and the anvil  62  through which the loose wrapping material  40  can pass whereby the loose wrapping material  40  can pass through the inlet  32  and reach the baling chamber  20  on the basis of the force of gravity and the rotating roll  54 . 
     The actuation arrangement  66  can be configured as desired, for example, mechanically, electrically, hydraulically or pneumatically, and is provided in order to bring the shear rail  70 , and with it also the tensioning roll  60 , into a supply position or a cutting position. The control can be performed manually or automatically as a function of the supply of crop to be baled. 
     The contact force arrangement  48  includes an arm  78 , a pressure roll  80 , and a force member  82 , that are located according to FIGS. 1 through 4, and  8  through  11  centrally on the side of the carrier or support  42 , facing away from the baling chamber  20 , which however, is not mandatory. The contact force arrangement  48  is required to bring the wrapping material  40  or the wrapping material supply roll  52  into frictional contact, that is, in friction force contact, with the roll  54 , and to retain it there during the operation so that the roll  54  conveys the wrapping material  40  securely on the one hand, and on the other hand, applies the necessary braking force. 
     The arm  78  is mounted for pivoting vertically about a horizontal bearing axis defined by a bearing  84  fixed to one end of the arm  78 . The bearing  84  is located slightly below the level of the carrier or support  42  in the vicinity of the upward bend, but need not be so located. The arm  78  may be configured as a bent plate as well as one or more pivot arms and has the shape of an angle lever in the embodiments, according to FIGS. 1 through 3,  4 , and  8  through  11 . 
     At its other end, the arm  78  carries the pressure roll  80 , free to rotate or carries it rigidly. The arm  78  and the attachment of the pressure roll  80  are here selected in such a way that the pressure roll  80  is in contact with the circumferential surface of the wrapping material supply roll  52  in every position of the arm  78  essentially diametrically opposite the roll  54 . 
     The force member  82 , that can also be characterized as a pressure member or tensioning member, has a lower end attached to the arm  78  in a joint located between the bearing  84  and the pressure roll  80 , and has its upper end coupled directly on the chassis  12 , or in this embodiment, with the covering  50  that is in turn, connected to the chassis  12 . The force member  82  may be configured as a mechanical spring, a gas spring or the like in order to maintain the contact force of the pressure roll  80  on the circumferential surface of the wrapping material supply roll  52 . The force member  82  is configured in such a way that it can be shortened against the effect of a force. 
     The covering  50  is configured, for example, as a sheet metal hood and is supported in a bearing  86 , free to pivot vertically at a location close to the bale-forming roll  32 , which delimits the upper side of the wrapping material inlet opening  32 . The covering  50  is so large that it covers the carrier or support  42 , the supply or feed arrangement  44 , the cutting arrangement  46 , and the contact force arrangement  48 , and protects them from dirt and weather influences. An arm  88  extends from the underside of the covering  50  at an end region remote from the bearing  86 , and has its free lower end region  90  pivotally coupled to the upper end of the force member  82 . In a closed position of the covering  50 , shown in FIG. 1, the bearing  84  is located underneath, and the pressure roll  80  is located above, a straight line connecting the bearing  86  with the free end region  90  so that the covering  50  is always forced downward as well as the pressure roll is forced against the wrapping material supply roll  52  since the force member  82  endeavors to expand, which however, is no longer possible after a dead center position has been passed. 
     The wrapping material supply roll  52  accepts several hundred meters of wrapping material  40 , and during operation, decreases steadily in diameter. The configuration of the carrier or support  42 , as well as the contact of the pressure roll  80  under the pressure of the force member  82 , has the result that the wrapping material supply roll  52  is always in contact with the roll  54 . The position of the wrapping material supply roll  52  relative to the roll  54  regularly assures that the wrapping material  40  wraps itself around the roll  54  through a wrapping angle of approximately  1800 . This wrapping angle can be reduced or increased by the corresponding selection of profile or coating. 
     On the basis of the above description, the result is the following operation of the wrapping arrangement  26 . 
     For the beginning of the operation, the covering  50  is brought into the position shown in FIG. 2, that is, it is raised so that the pressure roll  80  moves away from the supply or feed arrangement  44  and is raised, if necessary, from the wrapping material supply roll  52  or from its core. The cutting arrangement  46  is actuated so that there is no free access through the wrapping material inlet opening  32 . Following this, an enclosed wrapping material supply roll  52  is laid upon the carrier or support  42  from the side or from the front, an end section of the wrapping material  40  drawn away from it, laid over the roll  54  and drawn approximately until it makes contact with the shear rail  70 . Thereby, the position of the wrapping material supply roll  52  is selected in such a way that the wrapping material  40  is drawn from the lower side of the wrapping material supply roll  52  that is in frictional contact with the carrier or support  42 . Then, the wrapping material supply roll  52  is rolled up to the roll  54  and the covering  50  is lowered so that the pressure roll  80  is brought into contact with the circumferential surface of the wrapping material supply roll  52  and forces it into contact with the roll  54 . During the downward movement of the covering  50 , the force member  82  will cross a dead center position, and following that, assume a position in which it biases the covering  50  in the direction of the carrier or support  42 , and thereby always keeps it closed since the force member  82  is supported at its other end on the wrapping material supply roll  52 . During the baling operation, the tensioning roll  60  is not forced against the endless flexible drive element  58 , and hence the supply or feed arrangement  44  is not driven; the wrapping material  40  thereby remains in the previous position. As soon as the baling operation is ended, the shear rail  70  is retracted from the actuating arrangement  66 , and thereby the tensioning roll  60  is forced against the endless flexible drive element  58  so that the roll  54  is brought into rotation. The roll  54  then draws the wrapping material  40  from the wrapping material supply roll  52  so that it can fall directly vertically downward from the roll  54  through the wrapping material inlet opening  32  and reach the baling chamber  20 . As soon as the wrapping process is concluded, the actuating arrangement  66  forces the shear rail  70  against the anvil  62  and thereby holds the wrapping material  40  fast along the edge  68  so that it tears on the basis of the tension force that continues to be exerted by the rotating bale  112 . In this condition, the rotation of the roll  54  is interrupted because the tensioning roll  60  was raised. The remaining wrapping material  40  thereby again resumes its previous position. 
     The embodiment, according to FIG. 3, differs from the previous embodiment by a guide vane  92  that is located on the side of the roll  54  opposite the wrapping material supply roll  52  that ends in its underside in the edge  68 , which however, is not mandatory and whose upper end region extends slightly beyond the roll  54 . A further difference from the first embodiment lies in the fact that the retainer  76  for the tensioning roll  60  represents an extension of the arms  72 , instead of a branch. The operation and the remaining configuration of the wrapping arrangement  26  are identical to that of the previous embodiment. 
     The third embodiment, according to FIG. 3 a , shows the wrapping material supply roll  52 ′ of a type including a central core  130  having opposite ends respectively rotatably mounted to first ends of an arm assembly including a pair of transversely spaced arms  132  having their other ends pivotally mounted, as at  134 , to the opposite side walls of the baling chamber. A pair of extensible and retractable hydraulic actuators  136  are coupled between the side walls and the arm assembly for pivoting the latter vertically between a wrap material dispensing position, wherein the supply roll  52 ′ is engaged with the bale forming roll  30 , at the lower side of the wrapping material inlet  32 , such that the rotating roll  30  imparts rotation to the supply roll  52 ′ and causes the wrapping material  40  to be fed into the baling chamber. Braking of the rotation of the roll  52 ′ and selective separation of the wrapping material  40 , once a bale is wrapped, is accomplished in substantially the same manner as described above. 
     The fourth embodiment according to FIG. 4 corresponds generally to that of FIG. 3 where, however, the guide vane  92  is replaced by a guide roll  94  that is provided without drive at a small spacing from, and parallel to, the roll  54  and thereby holds the wrapping material  40  in contact with the roll  54 . 
     The fifth embodiment, according to FIG. 5, shows differences regarding the carrier or support  42  and the contact force arrangement  48 . The carrier or support  42 ′ is provided with a step  96  and configured with such a length that two wrapping material rolls  52  can be deposited on it, in particular, one to each side of the step  96 . The carrier or support  42 ′ is provided with a slight downward gradient towards the wrapping material inlet opening  32 , and the step  96  is used as a stop for the second wrapping material supply roll  52  that is provided as a supply. The contact force arrangement  48 ′ is based on the same principle as that of the previous embodiments, that is, a pressure roll  80  that is attached to an arm  78 ′ is forced against the wrapping material supply roll  52  by means of a force member  82 ′ supported on the covering  50 ; however, it is attached to the inside of the covering  50  in such a way that when the covering  50  is raised, all associated components are raised along with it and the wrapping material roll or rolls  52  can be loaded not only from the side but also from the front. The arm  78 ′ is again supported in bearings, free to pivot vertically, about a bearing  84 ′ on the chassis  12  or the side walls  28 , where the bearing  84 ′ is located in the region between the wrapping material supply roll  52  and the bale-forming roll  30  located above the wrapping material inlet opening  32 . The pressure roll  80  or pressure rod attached to the free end of the arm  78 ′ presses in the same position as before against the wrapping material supply roll  52 . The force member  82 ′ is fastened at its one end with the arm  88 ′ on the inside of the covering  50 , in particular, in the region of the second wrapping material supply roll  52 . Deviating from the previous embodiments, a bearing  98 , a deflecting lever  100 , and a steering arm  102  are provided. The bearing  98  has a pivot axis that is essentially horizontal, it is fastened to the side walls  28  or the chassis  12  and is located above the bearing  84 ′ within the space enclosed by the covering  50 ′. The deflecting lever  100  is configured with two arms and engages the bearing  98  in such a way that it can pivot in the vertical direction. One or more deflecting levers  100  may be provided. The other end region of the force member  82 ′ that is still free is connected in a joint to a free end of a leg  104  that extends generally in the upright direction in the closed position of the covering  50  and in the embodiment according to FIG.  5 . The end region of the leg  104 , that engages the bearing  98 , is connected rigidly to a leg  106  at an angle of approximately 90°, which engages the steering arm  102  in its free end region in a joint. The steering arm  102  that may be a component that can transmit force in two directions, such as a rigid rod, is connected with its other end region to the arm  78 , free to pivot, and extends in the position shown in FIG. 5 nearly parallel to the leg  104 . The configuration of this contact force arrangement  48 ′ has the result that the force member  82 ′ and the arm  78 ′ always pivot in the same direction, so that the wrapping material supply roll  52  is freed when the covering  50 ′ is opened or is raised. Finally, in this embodiment, the roll  54  is no longer located inside the circle described by the outer sides of the bale-forming rolls  30 , but now is only bordering on these. Indeed, the spacing is selected in such a way that the wrapping material  40  drawn from the roll  54  falls upon the bale-forming roll  30  located underneath the wrapping material inlet opening  32  and is carried along by it into the baling chamber  20 . In this way, there is still no need, as before, for any additional conveying elements in order to bring the wrapping. material  40  into the baling chamber  20 . 
     The sixth embodiment, according to FIG. 6, corresponds generally to that according to FIG. 5, particularly as far as the carrier or support  42 ′ and the contact force arrangement  48 ′ is concerned. However, the carrier or support  42 ′ no longer extends at an angle, but horizontally. The essential difference lies in the fact that the bale-forming device  18  located underneath the wrapping material inlet opening  32  is configured not as a bale-forming roll, but as an endless flexible element  108 , for example, as a belt, chain, band or the like, that extends over two deflecting pulleys  110 . In this case, the wrapping material  40  also falls onto the bale-forming device  18  downstream of the roll  54  and is conveyed by the bale-forming device into the baling chamber  20 . As in all previous embodiments, the wrapping material supply roll  52  is in contact with the roll  54  on which the wrapping material  40  lies, is carried along, and is enclosed in the downward direction. 
     The seventh embodiment, according to FIG. 7, corresponds essentially to that of FIG. 6, where however, the carrier or support  42 ′, the contact force arrangement  48 ′ and the covering  50  are oriented vertically, and the wrapping material supply roll  52  now lies upon the roll  54 . 
     The embodiments according to FIGS. 8 through 13 originate generally from the embodiments according to FIGS. 1 and 2, where however, a wrapping material  40 ′ with the associated wrapping material supply roll  52 ′ were selected that are wider than the baling chamber  20  or the bale  112  produced in it. The advantage of such an excessively wide wrapping material  40 ′ lies in the fact that the corners and a minor part of the end faces of the bale  112  can be covered, which reduces the effect of the weather. Also, during the wrapping with foil for purposes of silage, the wide wrapping material brings about lower air influences and applies less mechanical strain to the foil. In order to guide the wrapping material  40 ′ to the end faces of the bale  112 , according to FIGS. 8 and 9, guide vanes  114  are provided; according to FIGS. 10 and 11, slots  116  are provided; according to FIG. 12, a deflector  118  is provided; and according to FIG. 13, an inlet channel  120  is provided, in each case at or in the side walls  28  over which or through which the side regions of the wrapping material  40 ′ reach the baling chamber  20  and the wrapping material  40 ′ is gathered together to a smaller width. 
     The guide vanes  114  are surfaces angled to the outside from the side walls  28  that are, for example, sheet metal, that extend from the widest expanse of the wrapping material  40 ′ up to the side walls  28  at an angle of up to approximately 15° to 45°. The guide vanes  114  begin downstream of the wrapping material inlet opening  32  and extend further downstream to approximately the bale-forming roll  30  that is downstream from the wrapping material inlet opening  32 . 
     The slots  116  are formed by small cuts in the side walls  28  extending approximately radially from the center of the baling chamber  20 , where the rim region of the side wall  28  following each of the slots downstream, is bent outward in order to avoid a sharp edge that could damage the wrapping material  40 ′. 
     The deflector  118  is configured as a plate that is attached to the inner side of each side wall  28  upstream of the entry point of the wrapping material  40 ′ and is provided with a thickness that is slightly greater than that of the wrapping material  40 ′. The thickness of the deflector  118  may be configured as increasing steadily. In the embodiment shown, the deflector  118  is configured as an isosceles triangle, whose one leg  122  is immediately adjacent to the anvil  62 , while a second leg  124  extends along the line of supply of the wrapping material  40 ′. The second leg  124  begins at the circumference of the bale  112  and extends at least so far along the end face of the bale  112  as the wrapping material  40 ′ is to cover the end face. Thereby, the deflector  118  presses the bale  112  away from the inner side of the side walls  28  in the entry region of the wrapping material  40 ′ and forms a free space or gap in which the part of the wrapping material  40 ′ projecting beyond the width of the bale  112  can enter and be deposited on the end face of the bale  112 , as can be seen in FIG. 12 a . Accordingly, no opening is required in the side wall  28  in this case in order to bring the projecting section of the wrapping material  40 ′ into the baling chamber  20 . 
     The embodiment, according to FIG. 13, is also provided with a deflector  118 ′ that, nevertheless, is not in contact with the surface of the inner side of the side wall  28 , but maintains a slight distance to it, which forms the inlet channel  120 . The deflector  118 ′ may generally have the same shape and be attached at the same location as the deflector  118 . Nevertheless, the edge region of the wrapping material  40 ′, extending beyond the baling chamber  20 , is again conducted through a generally radial slot  116  in the side walls  28  to the end faces of the bale  112 . 
     Having described the preferred embodiment, it will become apparent that various modifications can be made without departing from the scope of the invention as defined in the accompanying claims.