Abstract: A grain tank for a harvester thresher has a plurality of walls including side walls and end walls which together form an upper filling opening, a cover articulately connected with each of the side walls and adapted to close the filling opening, vertically displaceable plates connected with the end walls and associates with the covers so that the covers in an upwardly folded condition together with the upwardly placed plates form a box-shaped structure to increase a volume of the grain tank, straight guides mounted on an inner side of the end walls, a power element operatively connected with the plates, so that the plates are upwardly and downwardly displaceable in the straight guides by the power element and the covers which are articulately connected with the side walls are turned by the plates.

Abstract: In a chopper for comminuting stalk-shaped harvested crops, in particular maize, to improve the throughput it is proposed that the cutting drum (10), the press rollers (7) and the post-accelerator rotor (6) have the same width. Preferably, the post-accelerator rotor (6) is arranged directly above the press rollers (7) and, to be precise, in particular on the side on which it can have the same direction of rotation as the cutting drum (10).

Abstract: A positional regulation of a mowing mechanism is effected in terms of height as a function of a ground pressure signal (SB) and in terms of swiveling in the transverse direction as a function of lateral ground clearance signals (SL, SR), the adjusting signals being carried to hydraulic valves (VT, VH; VL, VR).The goal is to increase the accuracy and freedom from fluctuation in the course of the mowing mechanism cutting height.The ground clearance signals (SL, SR) are used in proportion with the ground pressure signal (SB) for vertical position regulation. A linkage of these signals (SL, SR, SB) with further transducer signals and a method for automatic adaptation of the regulating characteristic by varying the hystereses and idle times of the regulators (V1, V1) is disclosed.The regulating apparatus is used in harvesting and threshing combines when low-height crops are to be mowed and when the ground is bumpy and soft.

Abstract: The grain-loss detector according to this invention usable in combination with a harvesting machine having an output passage comprises an impact plate having a front face exposed in the passage for direct contact by crop exiting the machine and an opposite back face and an electroacoustic transducer capable of converting vibration into an electrical output and having a side directly engaging the back face of the impact face. According to this invention the side of the transducer is retained in direct contact with the back face of the impact plate and electronic elements spaced from the transducer serve to convert the output of the transducer into a usable data signal.