A MOWER CONDITIONER

Abstract: A mowing machine has a frame (10) with driving wheels (13), which are adjustable in height, and a yoke (15) carrying a cutter beam (23). The yoke is suspended from the frame such that it can move up and down with respect to said frame, and the cutter beam is swingably journalled on the yoke. The yoke and the beam are balanced by an upwardly directed spring force (29). Minor elevations on the ground just make the cutter beam swing upwardly so that it is just the weight of the cutter beam itself which is accelerated.

Description: A mower conditioner Mowing involves driving at a very high speed, and a short stubble length is generally desired. Since the field is irregular, the cutter beam is subjected to rapid vertical movements with respect to the wheels. The machine is ba¬ lanced with springs so that the cutter beam just rests on the ground with a moderate pressure. Owing to the rela- tively great weight of the machine and the resulting in¬ ertia, the machine, in spite of good balancing, will be subjected to very strong shock impacts on the cutter beam with the problems this entails. CH-510 975 discloses a mower conditioner whose cutter beam is suspended from two long carrier arms, which are swing- ably connected with the frame of the mower conditioner by means of partly a hinge, partly a ball link. The cutter beam is rigidly secured to the hinged carrier arm and ro- tatably connected with the other by means of a ball link. This structure reduces the mass to be accelerated when the cutter beam meets irregularities. The invention concerns a mowing machine of the type stated in the introductory portion of claim 1, and the object of the invention is to additionally reduce the shock impacts to which the cutter beam is subjected when driving on an irregular field, while improving the ground following ability of the cutter beam. This object is achieved in that the mowing machine is constructed as stated in the characterizing portion of claim 1, since, in this structure, the cutter beam can pivot freely upwardly when hitting an elevation, so that it is just the weight of the beam itself which is accele¬ rated. The short distance between the center of gravity of the cutter beam and the hinge axis entails that the move¬ ments of the beam caused by irregularities will be more in the nature of tilting movements than distinct lifting movements which take place, when long carrier arms are used, thereby reducing the average lifting height. Claims 2 and 3 define two different, separately expedient embodiments of the mowing machine of the invention. The movements of the cutter beam with respect to the carrier means may be limited in both directions by the embodiment defined in claim 4. If an irregularity is so high that the beam pivots to stop, the upwardly directed spring force on the carrier means will have begun raising this owing to the smaller load. Because of the free downward movement of the cutter beam the machine can work with less ground pressure than the known machines. Not only the machine itself, but also the plants of the field will benefit from the reduction in the shock impacts. Two embodiments of the mowing machine of the invention are shown schematically in vertical section in figs. 1 and 2, respectively, of the drawing, and will be described more fully below with reference to these figures. In fig. 1, 10 is a frame to which wheel arms 12, earring wheels 13, are swingably secured via pivots 11. Hydraulic cylinders 14 are provided between the main frame and the wheel arms, making it possible to adjust the height of the main frame above the ground. A yoke 15 is ovably sus¬ pended from the frame 10 by means of two link rods 16 and 17 at each end. These link rods are swingably connected with the frame and the yoke, respectively, by means of pivots 18, 19, 20 and 21, and form together with these parallelograms making it possible for the yoke to move upwardly and downwardly with respect to the frame. A cutter beam 23 is swingably secured to the lower part of the yoke 15 by means of hinges 22, said cutter beam carry¬ ing a plurality of disc assemblies which are provided with knives and are generally designated 24. Stop means 25 and 26 on the yoke and the cutter beam, respectively, restrict the movement of the latter in an upward direction, and a stop arm 27 on the cutter beam cooperates with an adjust¬ able stop means 28 on the yoke to restrict the movement of the beam in a downward direction and to determine the cut¬ ting angle. The yoke 15 and the cutter beam 23 suspended from it are balanced by means of compression screw springs 29, whose one end rests on a flange 30 firmly connected with the frame 10, and whose other end engages a disc 31, which is pressed by the spring against a nut 32 on the threaded outer end of a rod 33, which is rotatably journalled at the lower end in an ear 34 on the yoke. The nut 32 makes it possible to adjust the spring tension. A wing wheel 35, throwing the harvested material rearward- ly between the wheels, is rotatably journalled in a gene¬ rally known manner in the frame 10, as shown in broken line. Minor elevations on the ground make the cutter beam 23 pivot upwardly about the hinges 22, without the yoke mov¬ ing noticeably. Only when an elevation is so large that the stop means 26 of the beam abuts the stop means 25 on the yoke, will this too be lifted. The same reference numerals are used in fig. 2 as in fig. 1 for corresponding parts. In the structure shown in fig. 2, the cutter beam 23 is hinged directly to the frame 10, and this hinging is performed by means of the same pivots 11 as those on which the wheel arms 12 are journalled. The compression screw springs 29 are here arranged between the wheel arms and a part firmly connected with the frame 10. In this structure, it is the entire frame which is lifted when the stop means 26 on the cutter beam abuts the stop means 25, which is here arranged on the frame. The constructive details in the mowing machine shown and described may be modified in several ways within the scope of the invention.

Claims: P a t e n t C l a i m s : 1. A mowing machine of the type having a cutter beam (23) carrier means (10 or 15) which is adjustable in height and is affected by an upwardly directed spring force, c h a ¬ r a c t e r i z e d in that the cutter beam (23) is so hinged at the ends to the carrier means (10 or 15) as to be swingable about a horizontal axis with respect to said means. 2. A mowing machine according to claim 1, c h a r a c ¬ t e r i z e d in that the carrier means is formed by the frame (10) of the mowing machine which is adjustable in height with respect to the cutter wheels (13). 3. A mowing machine according to claim 1, c h a r a c ¬ t e r i z e d in that the carrier means is formed by a yoke (15) which is movable up and down with respect to the mowing machine frame (10) which is adjustable in height with respect to the driving wheels. 4. A mowing machine according to claim 1, 2 or 3, c h a ¬ r a c t e r i z e d in that the carrier means (10 or 15) has adjustable abutments forming stop means (25) which determine the end positions of the cutter beam (24) with respect to the carrier means.

Inventors: LAURITSEN GEORG, LAURITSEN, GEORG
Applicants: TAARUP AS MASKINFAB, MASKINFABRIKEN TAARUP A/S
Application year: 1991
Main classification: A01D34
IPC codes: A01D34, A01D67