Abstract: The rotor (2) being operatively associated with an indexing member (13) in the form of a prism, coaxial and secured in rotation with the rotor, said indexing member having a number of projecting edges equal to the number of beaters (3), the indexing member being positioned on the axis of the rotor such that the application of the indexing plate (25) against the surface of the indexing member causes a rotation of the rotor (2) to a position in which one of the beaters is located at a position of maximum approach with the impact baffle (5), wherein approach of said baffle (5) into contact with the end of said beater (3) defines an origin of adjustment of the spacing ® between said baffle and said beater and thus the adjustment of said spacing for the desired granulometry.

Abstract: The rotor (2) comprises an indexing member (13) in the form of a prism, coaxial and secured in rotation with it and having a number of projecting edges equal to the number of beaters (3), this member being positioned on the axis of the rotor such that the application against one of its surfaces of an indexing plate (15) mounted at the end of the rod of an indexing jack (14), perpendicular to this rod, causes a rotation of the rotor (2) to a position in which the end of beater (3) corresponding to said edge is located at said position of a maximum approach with the impact baffle (5), thereby permitting defining the origin of adjustment of the spacing (R) between these two elements (5, 3) and thus the desired granulometry.