CS201461B1 - Facility for the propulsion of the undercutting knife of the agricultural harvesting machines - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for driving undercutting knives of agricultural harvesting machines, in particular for plants with low seed, such as legumes.

Former harvesting machines use a cutting element driven from one side, for example, a cutter bar blade. For low-crop crop harvesting machines, knives are used that work partially or completely below the soil surface to properly cut the plant without losing fruits. In order to minimize soil resistance, it is advisable to use as thin a blade as possible. Due to the required working width, the buckling strength of such a knife is very low and it is practically impossible to drive it from one side, as is the case with other harvesting machines. It must therefore be powered from both sides. However, the design which would meet the necessary requirements for blade strength when driven on both sides is not known.

The device for driving the undercutting knife of agricultural harvesting machines according to the invention solves these problems and eliminates the drawbacks of using the existing harvesting machines for harvesting plants with low seed. It is based on the fact that on both sides of the undercutting knife extending through the vertical conductors, drive joints are provided, coupled by rods to the eccentric drive pins, the drive shafts of which are mutually connected by the drive gears.

The device according to the invention provides such a design of the drive of a thin undercutting knife, whereby its synchronous drive is ensured from both sides, so that the knife is practically driven by pulling and the tissue component of its drive is zero or practically negligible. Thus, the invention makes it economical

201 461

201 481 and a functionally advantageous construction of a thin undercutter blade for use at or below the ground surface.

In the accompanying drawing, an exemplary embodiment of a device according to the invention is schematically shown in plan view.

In the plate-shaped vertical conductors 11, with their thin side forwards and fixed to the frame 11, an undercutting knife 2, provided with a cutting edge, i.e. a straight cutting edge, or a set of cutting edges, for example in the form of a sawtooth, is guided in cutouts. On both narrow sides of the undercutting knife 2 are provided drive joints 3, which are connected by rods 4 connected to the eccentric drive pin 5. The eccentric drive shaft 7 is mounted in a bearing 12 and is provided with a drive gear 8, for example a bevel gear. but it may also be provided with another gear, for example a sprocket. The two drive gears 8 of the two eccentrics 6 are connected to each other by a synchronizing drive 9, for example a bevel gear shaft or a chain (not shown). One of the drive shafts 7 is then provided with a drive terminal 10 connected to a torque supply (not shown).

The device according to the invention operates as follows: The torque is supplied by the drive terminal 10 to the synchronizing drive drive 9 which distributes it to both sides of the undercutting knife 2. There is driven by the drive shaft 7 an eccentric 6 which drives the undercutting knife 2 mainly by tension or combined tension and compression with minimum or zero buckling stress. In this way, even in the case of minimum thickness (to the undercutter 2, its reliable drive from both sides is ensured, without failures caused by the low buckling strength of the blade 2,

Claims (1)

SUBJECT OF THE INVENTION Apparatus for driving undercutting knives of agricultural harvesting machines, characterized in that drive joints (3), coupled rods (4) with drive pins (5) of eccentrics (2) are provided on both sides of the undercutter knife (2) passing through the vertical conductors (1). 6), whose drive shafts (7) are interconnected by drive gears (8)