Patent Publication Number: US-2021187890-A1

Title: Vertical box baler and method of operating it

Description:
I. FIELD OF APPLICATION 
     The invention relates to box balers, in which the material to be pressed is pressed by a press stamp against a fixed abutment, namely the end wall of the press box. The invention relates specifically to vertically acting box balers, in which the press stamp moves up and down, usually vertically, and presses the material to be pressed against the bottom of the press box, which is open at the top and only closed by the press stamp. 
     II. TECHNICAL BACKGROUND 
     The one or both parallel acting press stamps are mostly actuated by hydraulic cylinders. 
     Such vertically acting box balers are often used when the amount of material to be baled is low. 
     Filling and emptying is often carried out from the front side of the baler, which has a closable filling opening in the upper part of its front wall, through which the loose material to be pressed—e.g. empty cartons or empty plastic bottles or beverage cans—is manually filled into the press box when the press stamp is in the upwardly retracted starting position, i.e. above the filling opening. 
     When a bale has built up to the desired height after a certain number of pressing strokes, it can be removed via the closable removal opening under the filling opening in the front wall. 
     In order to reduce the manual effort and also to increase the process flow of such a vertically acting box baler, it is known that such box balers are filled automatically by a conveyor belt that transports loose material placed on it to the filling opening and ejects it through this opening into the bale chamber when the press stamp is in its initial position above it. The conveyor belt usually runs at an angle from bottom to top to the filling opening, so that the loose material can easily be placed on the low lying end of the conveyor belt. 
     As such an automatic filling device would be in the way when emptying the box baler if the filling opening and therefore also the filling device were still located at the front side of the baler, in these cases the filling opening is usually located at the rear opposite the front side. 
     However, such a conveyor requires a lot of floor space in addition to the rest of the vertical box baler, whose principal advantage is that it requires very little floor space, thus losing its main advantage. In addition, a vertically operating box baler equipped with such a conveyor cannot be placed at a small distance in front of a wall. 
     In addition to that, it is often the case-especially with cardboard boxes or empty beverage cans as pressed goods-that the pressed goods are collected away from the baler in collecting trolleys open at the top, and the filled collection trolleys are then pushed to the baler. The collecting trolley should then be emptied as completely as possible into the baler so that the empty trolley is immediately available again. 
     The material to be pressed is thus accumulated in batches at the baler. 
     III. DESCRIPTION OF THE INVENTION 
     a) Technical object 
     It is therefore the object according to the invention-especially in the case of batchwise accumulated material to be pressed-to provide a vertically acting box baler with an automatic filling device, which requires the smallest possible footprint, is simple, so that it can be manufactured cost-effectively and yet functionally reliable, and requires only the least possible manual effort for operation, as well as a corresponding operating method for operating such a baler. 
     b) Solution of the object 
     This object is solved by the characteristics of claims  1  and  15 . Advantageous embodiments result from the subclaims. 
     A standard vertical box baler comprises a bale boxwith a bottom and side walls rising upwards, usually vertically, from its circumferential edges, which form the bale box, and a press stamp which can be moved up and down in the bale box, usually by means of one or more parallel, usually hydraulically operated, working cylinders which can be moved with great force. 
     The bottom and thus the inner horizontal cross-section of the bale box is usually approximately rectangular, so that there are four side walls arranged in a rectangle when viewed from above, which are usually adjacent to each other, i.e. they surround the bale chamber continuously in the horizontal circumferential direction. The side walls are not exactly parallel to each other, but are slightly further apart from each other from the back to the front, towards the removal opening, in order to facilitate removal of the finished bale. 
     However, other forms of horizontal cross-sections of the press box are also possible, for example a round cross-section with the result that there is then a single cylindrical side wall, which should, however, be covered by the mentioned several side walls used here. 
     One of the side walls, which is called the front wall, is usually designed as a completely openable removal door for removing the finished bale, and in its upper part, especially its upper half, there is a frontal filling opening that can be closed by a filling flap. 
     The upper edge of the filling opening is usually located below the pressing surface, the underside of the press stamp retracted into its upper end position, the starting position. The lower edge of the filling opening is usually still above the height of the upper edge of the removal opening, but at most 10 cm, better 5 cm below this height. 
     If there is an automatic—i.e. at least motor-driven and manually or by means of a control system—filling device, this filling opening is usually not located in the front wall, but in one of the other side walls, usually in the rear wall opposite the front wall. By means of such an automatic filling device, the loose material to be pressed, which is placed on top of or inside the press box, is not only transported up to the filling opening, but also through this opening into the press box, and for this purpose, if necessary, pushed through the filling opening by the automatic filling device. 
     There is also a control system-usually electric or electronic—which controls the entire baler, especially all moving parts of the baler. 
     This control system is supplemented by a corresponding sensor system, which detects in particular the open or closed position of the doors or flaps closing the openings of the bale box, the position of the press stamp and, if necessary, all other relevant physical parameters on the baler. 
     According to the invention, this object is solved in such a vertically acting box-type baler by first of all designing the automatic filling device for batchwise automatic filling of this baler, i.e. its pressing box. 
     This means that the batched material can be pressed very quickly using the baling press, which is based on the invention. 
     (Volume of Storage Container:) 
     In particular, this automatic filling device comprises a storage container for receiving loose material to be pressed, the volume of which—in case of variable volume its maximum volume—is sufficient to receive a complete batch—the maximum volume of which is predetermined—of, in particular, loose material to be pressed. The specified batch volume is usually the volume of a collecting trolley, in which the loose material to be pressed is collected at the place where it is produced. 
     This has the advantage that the entire content of a filled collecting trolley can be automatically emptied into this automatic filling device at once, saving a lot of time. 
     For this purpose, the filling device, especially its storage container, preferably has a filling opening, especially in the upper area, so that the loose material to be pressed can fall into the storage container from above due to gravity. In particular such a filling opening is formed in the upper side of the storage container, whereby as simplest solution the upper side can be completely open as filling opening. 
     Especially through such a large-surface filling opening, loading of the storage container is very easy and fast. 
     To ensure that the loose material to be pressed can be moved as easily as possible from the storage container to the filling opening of the press chamber, the storage container is connected to the filling opening or can at least be brought into contact with it. 
     This does not necessarily require a contact between the storage container and the filling opening, but only that the storage container and especially its discharge opening in the direction of the filling opening is or can be moved in a closely adjacent position to the filling opening. 
     The bottom of the storage container is at the level of the lower edge of the filling opening or slightly above it and reaches close to it by at least  2  cm or at least  1  cm or even into the filling opening. 
     This allows the material to be pressed to be pushed along the bottom of the storage container into the filling opening. 
     (Lifting/Pivoting Device:) 
     Preferably, the filling device has a pivoting device for pivoting a filled collecting trolley into the storage container, in particular a lifting/pivoting device, by means of which the collecting trolley can first be lifted to a corresponding height until it can be emptied by pivoting into the high positioned filling opening of the storage container. 
     This means that the filled collecting trolley does not have to be emptied manually into the storage container. Instead, this is done automatically and power-savingly by means of the pivoting device, in particular the lifting/pivoting device. 
     This is preferably designed in such a way that for emptying the collecting trolley is only lifted as little as possible to the top, as it projects far upwards over the filling opening due to pivoting over, and often only a limited height is available at the place of use of this baler 
     The pivoting device preferably has a ixing device for attaching a collecting trolley, which can be connected to the pivoting device in the lowered position of the pivoting device, for example, by simply contacting and locking it in place, and can then be automatically lifted and emptied. 
     This means that the collecting trolley only has to be manually brought into contact with the fixing device and, if this does not cause automatic locking, it must be manually fixed to it. Preferably, a sensor monitors whether a collection container is present and/or correctly attached to the fixing device and thus to the pivoting device. 
     (Storage Pusher:) 
     In order to transport the material to be pressed from the storage container into the filling opening of the press box, the storage container preferably has a driven storage pusher which can be moved towards and away from the filling opening between two end positions so that this does not have to be done manually either. 
     In one end position the storage pusher closes the filling opening of the press box and its front surface is then part of the inner surface of the press box and/or the storage pusher is part of the side wall in which the filling opening is located. This keeps the number of components and the weight of the baler low. 
     In the other end position, the storage pusher is located at the end of the storage container facing away from the filling opening, so that loose material to be pressed can be filled in between. 
     The storage pusher can either be moved back and forth in the storage container or the front wall of the storage container facing away from the filling opening is itself the storage pusher and can move in transverse direction to the filling opening. This keeps the number of components low. 
     Preferably, the side walls are then designed to be variable in length, especially multi-part, especially telescopic, but they can also be rigid, one-piece side walls, which then still extend far from the rear of the actual baler when the front wall is moved in the direction of the filling opening. 
     The storage pusher is usually moved by means of double-sided towing cylinders, preferably running in its direction of movement, or by another storage pusher drive. 
     A particularly space-saving arrangement is achieved if these towing cylinders run along the outside of the storage container and especially also along the outside of the cross walls of the press box, since they then generally do not protrude further than the storage container itself in any of their possible positions. 
     Preferably, they are designed as pulling cylinders, i.e. they are designed so that pressure can be applied to them, especially in the direction in which the piston enters the cylinder. 
     (Cover Flap:) 
     The storage container has a cover flap so that when the loose material to be pressed in the storage container is pushed forward in the direction of the filling opening, the loose material to be pressed does not pile up above the upper filling opening of the storage container, which is displaceable between a closed position closing the filling opening or in particular the entire open top of the storage container and an open position not closing it, in particular leaving it completely open, so that in this open position the filling opening is available for the filling of loose material to be pressed. 
     In the closed position, the underside of the cover flap should run parallel to the bottom of the storage container in order to create a channel of constant height, which the storage pusher essentially fills in height in each of its functional positions. 
     The cover flap may also have a crank or other retaining elements at its free end, i.e. the end facing away from its pivot axis, which are directed towards the inside of the storage container to prevent pressed material from being pushed over the rear edge of the storage container when the cover flap is lowered. 
     The storage pusher should of course fill the channel created by the closed storage container in the direction of the filling opening, also in the width, as far as possible in all its functional positions. 
     (Guiding Flap:) 
     Alternatively, the storage container can include a guidingflap, the underside of which serves as a guide surface for the loose material to be pressed towards the filling opening. 
     For this purpose, it can be moved, in particular pivoted, between a guide position above the filling opening of the storage container at an angle to the bottom, in which the underside of the guiding flap approaches the bottom of the storage container in the direction of the filling opening, and an open position not overlapping this. 
     This means that the upper edge of the storage pusher does not touch the underside of the flap or reach close to it, but no significant force is required to press down the flap as with a cover flap. Instead, the reservoir pusher pushes the loose material along the bottom towards the filling opening, whereby the material can pile up over the upper edge of the storage pusher, limited only by the underside of the guiding flap. 
     By moving the storage pusher back and forward again, a considerable amount of loose material can still be fed into the press chamber in several strokes. 
     It is recommended to provide a cover element extending from the upper edge of the storage pusher in the direction away from the filling opening to prevent pressed material from falling behind the storage pusher, i.e. on the side facing away from the filling opening. 
     At least in the guide position, side plates are then preferably provided which, in the guide position, close the free space between the side edges of the guiding flap and the edge of the feed opening of the storage container in order to avoid lateral leakage or protrusion of pressed material. 
     (Inclined Travel:) 
     In order to keep the overall height of the filling device as low as possible and to position its filling opening as low as possible for this purpose, the bottom of the storage container can be inclined upward, at least from the end of the bottom area which is located below the filling opening, preferably over its entire length. 
     Nevertheless, the bottom is a flat surface and rises towards the filling opening, especially towards its lower edge, so that the storage pusher can be moved along the bottom in a linear sliding movement, always keeping the same small distance from the bottom or even touching the bottom. For this purpose, the feed direction of the storage pusher runs parallel to the bottom of the container. 
     However, it is preferable that the front side of the storage pusher is parallel to the inner surface of the side wall in which the filling opening is located, so that the feed pusher, in its end position in which it is in the filling opening, is part of the corresponding side wall of the press box and its inner surface is aligned with the inner surface of the corresponding side wall. 
     (Storage Container can be Lifted:) 
     Alternatively, the storage container can be attached to the press box in a height-adjustable manner and can be lifted to an upper position in which the edge of the bottom of the press box is aligned with or slightly higher than the lower edge of the filling opening in a side wall, especially the rear wall, of the press box. 
     When the collecting trolley is emtied in, the storage container is then in a lowered position just above the bottom so that the collecting trolley, which is almost upside down, does not project very far upward when it is emptied into the storage container. 
     (Separate Drives:) 
     Frequently, not only the at least one press stamp, but also the moving parts of the automatic filling device, i.e. in particular the storage pusher and/or the cover flap and/or the tilting device or lifting/pivoting device and/or, if necessary, the liftable bottom and/or the storage container which can be lifted as a whole, are actuated by means of working cylinders, in particular hydraulic cylinders. 
     The working cylinders of the automatic filling device, in particular its towing cylinders, can be operated with the same working medium as the pressing cylinder actuating the at least one press stamp and can also be supplied with pressure medium from the same pressure medium source. 
     Preferably, however, the filling device and the press stamp should be operable independently of each other, in particular partially overlapping in time, and for this purpose there are preferably two separate and/or separately controllable drives for the at least one press stamp on the one hand and at least one or some movable parts of the filling device on the other hand, in particular two independently controllable hydraulic pumps. 
     (Strapping Device:) 
     Preferably, the box baler according to the invention also has a strapping device to tightly strap the finished bale with a flexible strapping material, for example a strapping band or a binding wire, before it is removed from the baler, thus preventing the pressed bale from being re-enlarged or even falling apart. 
     In the context of the present invention, only a binding wire is mentioned, without limiting the strapping material to this. 
     Preferably, such a strapping device comprises at least one wire pusher capable of pushing the binding wire, in particular its end, which may be designed as a wire lug, between the press stamp and the top of the bale from the back to the front side of the press box. 
     With regard to the operating method for operating a vertically acting box baler, in particular a vertically acting box baler as described above, this object is solved by carrying out the automatic filling of the baler or its press box in batches. 
     This means that if a batch of loose material to be pressed accumulates, work can be carried out with very little personnel effort. The loose pre material to be pressed is automatically forced through the filling opening into the press box, in particular pushed in, until the entire batch of material to be pressed is inside the press box. 
     (Via Cover Flap or Guiding Flap:) 
     Preference the loose material to be pressed before or during pushing into the press box, is compressed in height to a height equal to or less than the height of the press box filling opening. 
     This allows the pre-compressed material to be moved through the filling opening into the press box without any further measures, for example by pushing it into the press box. 
     (Keep Width:) 
     For the same reason, it is preferably also necessary that the loose material to be pressed is either distributed over a width on the bottom of the storage container equal to or smaller than the width of the filling opening of the storage container before being pushed into the press box, or is compressed to a width smaller than the width of the filling opening before or during pushing into the press box. 
     (Filling During Pressing:) 
     In order to increase the process flow of the baler, the next filling is preferably prepared while the material is being pressed in the press box. For this purpose, preferably at least the emptied collecting trolley is moved back by the pivoting device into the docking position, in which it stands on the ground and can be released from the pivoting device, in particular a new, filled collecting trolley can already be attached to the pivoting device. 
     While the bale is being pressed, the storage container of the filling device can also be refilled, if necessary, because the storage pusher can already be moved back from its forward end position, in which it is part of a side wall of the press box, as soon as the press stamp has passed the filling opening and continues to move forwards downwards, and even more so while it then moves back to its upper starting position. 
     If necessary, the storage container can even be refilled if the storage pusher has not yet reached its starting position furthest away from the filling opening of the press box , whereby the space on the side facing away from the front surface of the storage pusher, which is part of the side wall of the press box during compaction, must be covered at the top to prevent material from falling into this area. 
     (Diagonal Drive:) 
     In order to be able to fill the storage container at the lowest possible height, the loose material to be pressed is pushed up to the height of the filling opening before being pushed into the press box. 
     (Lift the Storage Container:) 
     Alternatively, the material to be pressed can be lifted up to the height of the filling opening before being pressed into the press box, especially together with the storage container in which it is located. 
     (Strapping:) 
     In order to be able to strap the bale even with the baler embodiment according to the invention—whereby the binding wire must not run in front of the filling opening of the press box during the production of the bale—the binding wire, in particular its end, can be arranged in the press box at a height which corresponds approximately to the height of the upper end of the finished bale. 
     Then, after completion of the bale and while the press stamp is still under pressure on the bale, the wire, in particular the wire lug, can be pushed or pulled through the bale chamber from the back to the front, for example between the press stamp and the upper end of the bale, so that it is accessible at the front end of the press box—with the removal door open—and is available for connecting to the other end of the binding wire which is guided around the bottom of the bale and inserted into the bale box before the production of the bale begins. 
     c) Exemplary Embodiments 
     Types of execution according to the invention are described in more detail below as examples. 
     Shown are: 
       FIG. 1 a   : a first embodiment of a baler according to the invention in perspective view, 
       FIG. 1 b   : the baler of  figure 1 a    in side view, 
       FIG. 1 c   : the baler according to  figure 1 a    in top view with the cover flap of the storage container closed, 
       FIG. 2 a   : the baler of  FIG. 1  while filling the storage container, but with the removal door open, in perspective view, 
       FIG. 2 b   : the baler as shown in  FIG. 2 a   , but with the removal door closed, in side view, 
       FIG. 2 c   : the baler as shown in  FIG. 2 b   , viewed from above, 
       FIG. 3 a - c   : a second embodiment of a baler according to the invention in side view, top view and front view. 
    
    
       FIGS. 1 a - c    as well as  2   a - c  show a first embodiment of the inventive box baler  1  as well as a collecting trolley SW, in which material Pto be pressed such as empty cardboard boxes are collected for feeding this baler  1 , but in  FIG. 1  on the one hand and  FIG. 2  on the other hand in two different operating situations. 
     In the FIGS. , the box baler  1  points with its front side  1   a  to the right and with its rear side  1   b  to the left. 
     A standard vertical boxe baler comprises—and these elements are also present in the baler according to the invention—a press box  2  with a bottom  2   a , which in this case has a roughly rectangular shape when viewed from above, so that a total of four side walls  2 . 1  to  2 . 4  project upwards from its outer area, namely a front wall  2 . 1 , a rear wall  2 . 2  opposite thereto, and longitudinal walls  2 . 3 ,  2 . 4  connecting these two walls to one another, so that the inner surfaces of the side walls, which are adjacent to one another, form a circumferential closed rectangle when viewed in plan. 
     In the press box  2 —as best seen in  FIGS. 1 b  and 2 b   —a press stamp  3  in the form of a plate lying horizontally and thus parallel to the bottom  2   a  of the press chamber  2  can be moved up and down in the vertical, the pressing direction  10 , which can press the material P lying in the press box against the bottom  2   a.    
     The press stamp  3  is attached to the lower ends of the piston rods  14 . 1 - 14 . 3  by several press cylinders  13 . 1  to  13 . 3 , which are hydraulic cylinders and are located vertically in the second horizontal transverse direction  11 . 2 , spaced next to each other and projecting beyond the upper end of the press box  2 . 
     To apply high pressing forces, the two outer pressing cylinders  13 . 1  and  13 . 2  are extending downwards, while the middle pressing cylinder  13 . 3  with its smaller cross section is used as a rapid motion cylinder, for example to move the press stamp  3  quickly upwards back to the deactivated position. 
     Between each of the vertically running press cylinders  13 . 1  to  13 . 3 , which are arranged parallel to each other in a common plane, there is a guide rod  15   a, b , whose lower ends are also firmly connected to the press stamp  3  and are intended to prevent an inclined position and thus tilting of the press stamp  3  in the press box  2 . 
     The front wall  2 . 1  at the front side  1   a  is hinged to one of the longitudinal walls  2 . 3  via a vertical pivot axis and can be swung open like a door—as shown in  FIG. 2 a   —to remove a finished bale. 
     For pressing, the press stamp  3  moves downwards to the height of the lower end of the filling flap  2 . 1 . 1  and thus of the front filling opening, so that a finished bale has a height which also only reaches approximately the lower end of this filling flap  2 . 1 . 1 . 
     As best shown in  FIG. 1 b   , the press stamp  3  can be retracted upwards to at least the upper end of the front filling opening, i.e. the upper edge of the filling flap  2 . 1 . 1 , because the insertion of material to be pressed P must be done into the space below the press stamp  3 . 
     In a vertical box baler of the known type, the rear wall  2 . 2  of the press box  2  is closed or, if strapping of the finished bales is intended, has at most slits for the strapping medium to pass through. The rear wall  2 . 2  is preferably manufactured as a one-piece welded part, and the press box  2  is filled with material P from the front side  1   a  by inserting the upper part as a filling flap  2  in the movable front wall  2 . 1 , which thus forms a removal door  12 , which is movably attached to the rest of the front door  2 . 1  and can be moved downwards along guides so that a filling opening is open in the upper part of the front wall  2 . 1 , through which material to be pressed can be inserted from the front side  1   a.    
     the box baling press  1  according to the invention, which also operates vertically, has a filling opening  2 . 2   a  in the upper area of the rear wall  2 . 2 , through which it can be filled automatically according to the invention. 
     The filling opening to be opened in the front wall  2 . 1 , formed as described by the embodiment of a filling flap  2 . 1 . 1  in the removal door  2 . 1 , can be additionally present, but this is not a prerequisite for the realization of the invention. The front wall  2 . 1  can be a closed removal door  12 , which can only be moved as a door in total. 
     The automatic filling is carried out by means of a filling device  20 , which comprises a box-shaped storage container  21 , which is joined to the outside to the rear wall  2 . 2  of the press box  2  and has a horizontally extending bottom  21   a  in  FIGS. 1 and 2 , from which side walls  21   c, d  and at the free end an end wall  21   e  project, the side walls reaching up to the filling opening  2 . 2   a  in the rear of the press box  2 . 
     The upper side  21   b  of the storage container  21  can be closed by a cover flap  25 , which can be pivoted about a horizontally extending pivot axis  25 ′ near the press box  2  between the pivoted down position of the cover flap  25 , in which the upper side  21   b  is closed and the lower side of the cover flap  25  runs parallel to the bottom  21   a  of the storage container  21 , and a filling position pivoted upwards—as shown in  FIG. 2 —by means of a pivot cylinder  28 . 
     In this filling position, a collecting trolley SW filled with material P to be pressed, which is open at the top, can be swung up and emptied into the storage container  21  via the upper edge of the end wall  21   e  of the storage container  21 . 
     Lifting, pivoting, emptying, pivoting back and setting down the collecting trolley SW is usually done automatically by means of a lifting/pivoting device  22  as shown and described in  FIGS. 3 a   - c.    
     After the collecting trolley SW has been swung back, the cover flap  25  can be closed again with the aid of the pivot cylinder  28 , whereby the pivot cylinder  28  can provide sufficient pivot force that loose material P to be pressed projecting above the height of the upper edge of the end wall  21   e  is compressed by the underside  25   a  of the cover flap  25  below this level. 
     Inside the storage container  21   a  storage pusher  24  can be moved between a retracted position near the end wall  21   e  and an advanced or forward position near the filling opening  2 . 2   a  of the press box  2 , whereby the storage pusher 24  moves with its lower edge close to the bottom  21   a.    
     In the advanced end position—see  FIG. 1 b    —the storage pusher  24  is preferably not only located near the filling opening  2 . 2   a , but in this filling opening  2 . 2   a , which it closes completely so that it becomes part of the rear wall  2 . 2  of the press box  2  and its front surface facing the press box  2  is flush with the inner surface of the remaining rear wall  2 . 2 . 
     The storage pusher 24  is moved by means of two towing cylinders  26   a, b , which move along the outer sides of the side walls  21   c, d  of the storage container  21  and also along the longitudinal walls  2 . 3 ,  2 . 4  of the press box  2  in the first horizontal cross direction  11 . 1 , one end of each towing cylinder  26   a, b  being connected to one of the longitudinal walls  2 . 3 ,  2 . 4  in the vicinity of the front wall  2 . 1 , while the other end is connected to the storage pusher 24  through the side wall  21   c, d  of the storage container  21 . 
     The towing cylinders  26   a, b  are preferably designed as double-acting hydraulic cylinders that can be actuated in both directions. 
     In the embodiment of  FIGS. 1 and 2 , the bottom  21   a  of the storage container  21  runs horizontally, i.e. at right angles to the rear wall  2 . 2 , and the plate-shaped storage pusher  24  stands at a right angle to the bottom  21   a  and thus vertically, and completely fills the cross-section of the storage container  21 , i.e. at right angle to the extension direction of the towing cylinders  26   a, b , the pushing direction  24 ′ of the storage pusher  24 , so that no material P to be pressed can get in between. 
     Because in such a embodiment during filling, as can be seen in  FIG. 2 a, b   , the raised and pivoted collecting trolley SW protrudes beyond the baler  1  and thus requires a large available height at the place of use,  FIGS. 3 a - c    show a second embodiment of a baler  1  in which this required height is less, in particular not greater, than the height of the vertical box baler  1  itself: 
     The main difference compared to the first embodiment of  FIGS. 1 and 2  is that the bottom  2 . 1   a  of the storage container  21  does not run horizontally, but rises at an angle to the rear filling opening  2 . 2   a  in the rear wall  2 . 2  of the press box  2 . 
     As a result, its free end facing away from the bale chamber  2 , i.e. also the end wall  21   e  and its upper edge, is considerably lower than in the first embodiment, so that the collecting trolley SW has to be lifted less far up over this upper edge for emptying and thus also projects less far upwards in its—in  FIG. 3 a    also shown—emptying position, hardly above the height level of the upper end of the remaining baler, in particular the upper ends of the press cylinders  13 . 1 - 13 . 3 . 
     As  FIG. 3 a    shows, the end wall  21   e  of the storage container  21  is still vertical, and so is the storage pusher  24 , which is located in it like in the first embodiment, but the pushing direction  24 ′ of the storage pusher  24  is no longer horizontal but runs diagonally rising parallel to the bottom  21   a  of the storage container  21 . 
     
       5 
     
     The remaining embodiment of the baler  1  corresponds to the first embodiment of  FIGS. 1 and 2 , but  FIGS. 3 a -3 c    additionally show the lifting/pivoting device  22 , which lifts the filled collecting trolley SW, which has been driven up on the ground and fixed in it, and pivots it into the correct position and empties it into the storage container  21 . 
     For this purpose, the collection trolley SW is coupled to the lifting/tipping device  22  by means of a fastening device  23  of the lifting/pivoting device  22 , which in this case—as shown in  FIG. 3 b   —has a U-shaped fork as seen in plan view, into which the collecting trolley SW can be driven in the  2 nd transverse direction  11 . 2  and is locked there automatically or manually. This U-shaped fork is then lifted and pivoted by motor along corresponding guides of the lifting/pivoting device  22  together with the collecting trolley SW. 
     Furthermore,  FIGS. 3 a - c    contain the side plates  29   a, b , which can best seen in  FIG. 3 a    and are optionally available. These plates are aligned or parallel to the side walls  21   c, d  of the storage container  21  and extend them upwards, thus increasing the filling volume of the storage container  21 . The cover flap  25  pivots between the open position shown in  FIG. 3 a   —in which it usually only slightly covers the open top of the storage container  21 —with its side edges tightly fitting between the side plates  29   a, b  downwards to the lower end position. 
     When used as cover flap  25 , this lower end position is an end position parallel to the bottom  21   a , in which the distance between the closed cover flap  25  and the bottom  21   a  remains the same over the entire displacement path of the storage pusher  24 , in particular until the latter has reached its end position in the filling opening  2 . 2   a , where it becomes part of the corresponding side wall  2 . 2 . 
     However, if the side plates  29   a, b  are present, the cover flap  25  can also be used as guiding flap  25 *, which means that the lower end position is not an end position parallel to the bottom  21   a , but a position inclined to the bottom, in which the distance between the guiding flap  25 * located in this end position and the bottom  21   a  of the storage container  21  decreases from the free end wall  21   b  in the direction of the filling opening  2 . 2   a.    
     If, in this operating mode, the storage pusher  24  moves from its retracted end position in the direction of the filling opening  2 . 2   a , material can pass over the upper edge of the storage pusher  24 , which is why a cover element  27 , which can be adjusted in length or moved, is provided from the upper end of the storage pusher  24  to the upper edge of the free end wall  21   b.    
     In order to push the entire filled material to be presses into the press box  2  in this mode of operation, several working strokes of the storage pusher  24  may be necessary, however, the pivot cylinder  28  for the cover flap or guiding flap must be made less strong for this purpose and/or a higher filling volume in relation to a lower volume of the storage container  21  can be handled during a filling process. 
     LIST OF REFERENCE SIGNS 
     
         
         
           
               1  box baler 
               1   a  front side 
               1   b  rear side 
               2  press box 
               2   a  bottom 
               2 . 1  side wall, front wall 
               2 . 1 . 1  filling flap 
               2 . 1   a  removal opening 
               2 . 2  side wall, rear wall 
               2 . 2   a  filling opening 
               2 . 3 ,  2 . 4  side wall, longitudinal wall 
               3  press stamp 
               10  press direction, vertical 
               11 . 1  cross direction, process flow direction 
               11 . 2  cross direction 
               12  removal door 
               13 . 1 - 13 . 3  press cylinder 
               14 . 1 - 14 . 2  piston rod 
               15   a, b  guide rod 
               20  filling device 
               21  storage container 
               21   a  bottom 
               21   b  upper side 
               21   b    1  filling opening, 
               21   c, d  side wall 
               21   e  end wall 
               22  pivoting device, lifting/pivoting device 
               23  fixing device 
               24  storage pusher 
               24 ′ movement direction, pushing direction 
               24   a  front surface, pushing surface 
               25  cover flap 
               25 ′ pivot axis 
               25 * guiding flap 
               25   a  underside 
               26   a, b  towing cylinder 
               27  cover element 
               28  pivot cylinder 
               29   a, b  side panel 
             P material to be pressed 
             SW collecting trolley