The new combine harvester technology for grain crops also includes combing the plants at the root. However, harvesting of the combed stalks is still a major constraint on the widespread use of the new harvesting technology. The segmented tine cutter with reciprocating blade movement is the most compact and technologically reliable for cutting the combed stalks. A conveyor mechanism designed as an endless chain loop with rakes attached to it is used to clean the cutting area. Rakes are positioned above the cutterbar parallel to the plane of the segments, on which the cut stalks are transported to the exhaust window zone. However, using the small-sized above-mentioned cutterbar raises the problem of balancing transverse vibrations and rake clearing in the windrow formation zone. The geometric parameters of a cutting unit based on an endless chain with an active windrower are grounded in the article. A system of equations for determining the range of possible impact point values on the surface of the reflecting roller is obtained. This is used in modeling the interaction of the stalk with the surface of the rollers. This system of equations also makes it possible to determine the maximum height that the stalk can reach in its turning. This is necessary to substantiate the height of the rollers. When studying the mechanical and technological features of interaction between the combed stalks and the working elements of the cutting unit, the following tasks were solved: the chosen scheme of stalk transport forms and places the swath between the working organs of the combine harvester; as a result of kinematic analysis of the transporting mechanism it has been determined that at the place of rake turning there are good conditions for cleaning this mechanism from the stalks and forming a swath. A physical model of the interaction of the stems with the surface of the windrower in the form of two reflecting rollers that form a single unit with the sprockets of the conveying mechanism has been developed. Using such unit would reduce the vibration of the cutter and improve the quality of cleaning the rake in the windrow forming zone.