Sieve for threshing machine, especially a combine harvester intended for the collection of grains

The sieve for combine harvesting grain has a zigzag pattern and consists of sections (13, 13a, 13b, 13c) which are repeated, each section being composed of a section (14, 14a, 14b, 14c) . Each section comprises a first arm (16) and a second arm (18) arranged at an angle. The first arm (16) is provided with an extension (22) parallel to the first arm (16) transversely to the conveying direction (6) terminated by a ridge. The extension (22) projects in the conveying direction (6) beyond the junction zone (19) of the first arm (16) with the second arm (18) of the segment located in front in the conveying direction (6). straw rods (27) eventually reach the screen surface are carried by the extensions (22) and away from the screen surface (5) upon movement of the sieve in the conveying direction (6).