Material Reducing Device

A material reducing machine comprising:

• (a) a frame;
• (b) a drum rotor which is mounted for rotation with respect to the frame, said drum rotor comprising a generally cylindrical peripheral wall;
• (c) a plurality of tools mounted on the peripheral wall, at least one of which tools has a leading edge that defines an arc when the drum rotor is rotated, which arc is spaced outwardly from the peripheral wall and is parallel thereto;
• (d) means for rotating the drum rotor with respect to the frame;
• (e) an input conveyor for conveying material to be reduced towards the drum rotor;
• (f) a pivot shaft;
• (g) a pivot arm that is mounted for rotation on the pivot shaft, said pivot arm having a compression roller at its forward end;
• (h) a first resistance and biasing mechanism that is mounted between the frame and the pivot shaft and adapted to allow limited upward elastic movement of the pivot shaft;
• (i) a bypass arm having a rear end that is mounted for rotation on the pivot shaft, said bypass arm being adapted to pivot on the pivot shaft independently of the pivot arm;
• (j) a breaker bar assembly that is mounted to the bypass arm, said breaker bar assembly:
• (i) including a back plate with a plurality of breaker bars mounted thereon;
• (ii) being located so that material which is carried by the tool of the drum rotor is directed against the breaker bar assembly;
• (k) a second resistance and biasing mechanism that is mounted between the frame and the rear end of the bypass arm and adapted to urge the breaker bar assembly towards the drum rotor;
• (l) an outlet for reduced material comprising a screen section that is located downstream of the breaker bar assembly.