Abstract: A rotor cutter comprises a cutting member (1) adapted to be driven into rotation about an axis of rotation (3). The cutting member comprises a knife holder (6) connected with a knife (12). The knife (12) comprises a blade, which during the rotation of the cutting member (1) rotates in a plane substantially perpendicular to the axis of rotation (3) of the cutting member (1). The knife (12) comprises furthermore a shank (13) rotatably journalled relative to the knife holder (6) about a swivel axis (11), said swivel axis forming an acute angle (.alpha.) with the axis of rotation (3) of the cutting member (1), the angle space of said angle facing upwards.

Abstract: An apparatus is provided for mowing grass and similar vegetation. The apparatus has a frame (1), in which a horizontal shaft (2) is rotatably mounted, the shaft (2) extending horizontally in the position of use. Swingles (19) are provided along and around the shaft (2), these swingles (19) being pivotably connected with the shaft for rotation about axes extending substantially parallel to the shaft. The swingles are terminated at their outer ends by edges (20), extending substantially parallel to the shaft (2). In order to make the apparatus operative for airing the grass field or lawn in addition to the mowing of grass, at least some of the swingles (19) carry tilling elements (26) for producing airing openings or grooves in the soil.