The invention relates to a knot for fastening a knife by oscillatingly moving mower knives, comprising a shaft (1) defining a first longitudinal axis (X) and having a receiving recess (4)； a driving trunnion (2) of the mowing knife, which is adapted to be inserted into the receiving recess (4) and detachably connected to the shaft (1), which extends axially with respect to the first longitudinal axis (X) beyond the shaft (1) and defines the second longitudinal axis (Y), which is displaced radially relative to the first longitudinal axis (X), in which the wall (5) of the shaft (1), which limits the receiving recess (4), has a first circumferentially curved bearing surface (6)； the retention zone (13) of the upper bearing of the driving axle (2) of the mowing knife, which is inserted into the receiving recess (4), has the first contact surface (14), which is in contact with the supporting surface (6) and is bent in the direction opposite to the bending direction the first bearing surface (6)； and connecting means (24) for detachable connection of the drive trunnion (2) of the mowing knife with the shaft (1), characterized in that in the wall (5), limiting the receiving recess (4), the recess (8) is made, and the zone (13) holding the upper bearing of the drive axle (2) of the mowing knife has a shoulder (16) adapted to be inserted into the recess (8), the recess (8) made in the form of a groove in the wall (5) that extends radially relative to the second longitudinal axis (Y ).Изобретение относится к узлу крепления ножа колебательно движущихся ножей косилки, содержащему вал (1), определяющий первую продольную ось (X) и имеющий приёмную выемку (4)； поводковую цапфу (2) косилочного ножа, которая выполнена с возможностью вставки в приёмную выемку (4) и разъёмно соединена с валом (1), которая простирается аксиально по отношению к первой продольной оси (X) за пределами вала (1) и определяет вторую продольную ось (Y), которая смещена радиально относительно первой продольной
