Abstract: This invention relates to a harvesting machine (adapter) for gathering grain crops, mainly sunflower, comprisingan underframe suspensible on the front part of a corn combine;nose cones arranged on the front part of the underframe, projecting in the direction of travel, straddling from either side the rows of plants to be gathered and directing them into stem guiding channels;cutting devices arranged at the rear part of the stem guiding channels and designed preferably as rotating cutting devices;tray-like coverings arranged behind the frontal nose cones and in regions between the channels for collecting the dropped-out grains and directing them backward, said coverings being movably coupled to the underframe and their rearward slope being adjustable;at least one picking-shaking or vibrating unit for picking, shaking or vibrating the tray-like coverings or at least the movably embedded part thereof to cause rearward movement of grains fallen onto them;a transverse gathering device with a catch trough located o