Abstract: An earth tilling machine is provided having a structural frame on which a plurality of earth working units are mounted and operable to cultivate or till the soil. Each earth working unit includes an earth working head having a plurality of earth working rotors each mounted for revolution about a respective vertical axis with the axes of all rotors of a particular head disposed in a common vertical plane. The rotors of each head are mounted for revolution about a single vertical axis which is coaxial with the axis of revolution of one of the rotors of each particular head whereby the effective working width of the head can be varied from a minimum of the effective working diameter of a single rotor to a maximum of the cumulative effective working length of all rotors carried by that head.

Abstract: A farming implement, particularly for row cultivation, wherein the operator device comprises a mill or harrow having substantially vertical axes or slightly inclined to the vertical, and connected to the tractor by the interposition of an automatic device for transverse movement relative to the tractor, transversely displacing the implement and securing it at any intermediate position.