Large bale press
This is a continuation of co-pending application Ser. No. 470,256 filed on Feb. 28, 1983, now abandoned. 
    
    
     BACKGROUND OF THE INVENTION 
     The invention concerns a large bale press for cut blade material comprising a compression chamber that can be opened for discharge of the bale. The compression chamber has an input opening for feeding of the blade material from a take-up device and conveyer drum. 
     In view of a capability of baling several hectares of blade material per hour, which makes use of even brief periods of good weather possible, the use of large bale presses is on the increase. The majority of such presses are rolling bale presses. Rollers are arranged on the circumference of the compression changer to form the input blade material into a round bale. However, such bales are severely matted because the individual blades become intertwined with each other. Also, the compression chamber of the baler is driven by a mechanically complicated power train making such known rolling bale presses cumbersome and complicated in design. Moreover, such known bale presses are capable of producing only round bales, which are undesirable when stored on sloping areas. 
     Another type of large bale press comprise a compression chamber having a discharge opening that is activated by a hydraulic or mechanical system that is powered by the tractor. While conveyer elements on the circumference of the compression chamber and their driver mechanism are eliminated, a hydraulic or mechanical transmission is still required for the compression process. 
     The objective of this invention is a simple bale press that can be manufactured economically and is safe in operation. 
     SUMMARY OF THE INVENTION 
     A large bale press, in accordance with the present invention, comprises a compression chamber that is fed by a conveyer drum corresponding to the width of the bale to be formed. One or more tying mechanisms are provided, each with its own yarn supply roll, and arranged above an input opening to the compression chamber and the conveyer drum. Each tying mechanism is coordinated with a swivel needle and a moveable yarn guiding device. 
     The conveyer drum stuffs the blade material into the compression chamber, achieving high density. This eliminates the mechanical pressing process and the hydraulic or mechanical pressing components, thus eliminating complicated mechanism. 
     In a preferred example, the upper part of the compression chamber is slotted in the circumferential direction. The slots are a lead-through for the yarn guide components. At the beginning of the filling process, the yarn guide components guide the yarn strands in order for the yarn to wrap correctly around the bale. Instead of the usual spiral binding process, any desired number of yarn rings may be wrapped around the bale and tied in knots, which results in a fast tying process. 
     Preferably, the yarn guide components are connected with an openable rear wall portion of the compression chamber in a way that they are operated by the swivel movement thereof. The yarn guide components are swiveled toward the tying mechanism when the rear wall of the chamber is opened. When the rear wall of the chamber is being closed, the yarn guide components seize the yarn strands and swivel back into their original position. 
     Another feature of the present invention is that the compression chamber is tiltably arranged around a horizontal axis that is transverse to the driving direction. This tilting of the entire compression chamber through a relatively small angle makes problem-free delivery of the needle to the typing apparatus possible in order to knot the yarn arranged around the completed bale. 
     The compression chamber itself can be round or rectangular. A rectangular shape for the bale has the advantage that it is easier to transport and increasees the available cube of the compression chamber approximately 20%. A rectangular shape is of special advantage for silo storage, since such bales are easy to stack. 
     The conveyer drum can be equipped with a cutting mechanism for cutting the blade material, which makes the large bale press suitable for any kind of feed. Compared to the spiral binding method, there is little &#34;dead time&#34; of the equipment when tying the bales. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 A schematic side view of a large bale press according to the invention, with a cylindrical compression chamber prior to the start of the filling process. 
     FIG. 2 The same large bale press after filling of the compression chamber. 
     FIG. 3 The large bale press in the position in which the knot is made. 
     FIG. 4 The same large bale press during ejection of the finished bale. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     As seen in FIG. 1 of the drawings, a large bale press comprises a trailer coupling which is attachable to a tractor (not shown). A Cardan shaft 2 transmits power from the tractor to the large bale press. A compression chamber 3 is supported on drive wheels 4 for movement in the direction of the arrow A. A take-up unit 5 takes up the cut blade material and channels it into a conveyer drum 6. The conveyer drum is equipped with forwarding prongs 7, and can have an additional cutting unit (not shown), which works together with the prongs to cut the long blade material in order to achieve denser packing in the compression chamber 3. 
     The compression chamber 3 consists of two housing halves, 8 and 9. The housing half 8 is fixed, and the second half, 9, can be tilted up around a swivel axis 15 to permit the finished bale to be discharged from the compression chamber 3. A conventional tying mechanism 10 comprises a yarn supply roll from which the yarn 13 runs over a swivel yarn guide 11 to a swivel needle 12. The swivel needle 12 is mounted on an arm 20 and the yarn guide 11 is mounted on an arm 22. By comparing FIGS. 1, 3 and 4, it can be seen that the arms 20 and 22 (shown partially diagramatically) pivot about an axis 17 to carry the needle 12 and guide 11, respectively, into operative relationship to the tying mechanism 10. 
     As seen in FIG. 1, the compression chamber 3 is of circular cross section and has an input opening 14 to provide for admission of blade material into the compression chamber 3. The compression chamber can easily be taken off so that different sizes can be used; e.g., a bale with a diameter of approximately 1.2 meters and a volume of 1.4 cubic meters can be formed, or one with a diameter of 1.5 meters and a volume of 2.1 cubic meters, or one with a diameter of 1.8 meters and a volume. 
     FIG. 1 shows the large bale press in condition to pick up blade material. The yarn 13 of each typing apparatus, any desired number of which can be arranged side by side, runs over yarn guide 11 to swivel needle 12 and is attached thereto. If the large bale press is set into motion, compression chamber 3 slowly fills with cut blade material, while the yarn 13 wraps around the bale through feeding pressure so as to enclose the rear half of the bale, as shown in FIG. 2. 
     The conveyer drum 6 is preferably the length of the compression chamber 3 and bale 16, and is situated between the take-up unit 5 and the input opening 14 of the chamber 3. The drum 6 stuffs the feed into compression chamber 3, achieving very high density. A cutting mechanism may be integrated with the drum 6 if high density is desired. 
     After compression chamber 3 is filled with feed and the yarn 13 has wrapped around the rear half of the bale, compression chamber 3 is tilted backward by an angle α, as shown in FIG. 3. Simultaneously, the needle 12 is moved toward its corresponding tying apparatus 10, which automatically forms a knot and separates the yarn from the supply roll. Thus, the bale is wrapped by one or more parallel yarn circles, depending on the number of tying apparatus and corresponding number of needles, and can now be ejected, as shown in FIG. 4. 
     To achieve bale discharge, the rear portion 9 of the compression chamber 3 swivels around swivel axis 15 with respect to the fixed portion 8 thereof, and, thus, forms a discharge opening which is large enough to permit the finished bale 16 roll off to the rear. 
     When the rear portion 9 of compression chamber 3 is opened, yarn guide 11 is swiveled into close proximate relation to the tying apparatus 10 and seizes the yarn 13. When rear portion 9 of chamber 3 is closed after ejection of the finished bale 16, yarn guide 11 swivels back into its original position, as well as needle 12 that also has seized yarn 13, and is returned to its initial position. 
     As seen in FIGS. 1 and 4, the front portion 8 of the compression chamber 3 is provided with slots 24 at the points at which one or more yarn guides 11 and needles 12 are arranged, so that the yarn can penetrate freely through the interior of compression chamber 3.