Crusher

A crusher comprising:

• a crushing apparatus including a crushing rotor provided with a crushing bit for crushing target materials;
• a feed conveyor for conveying the target materials to said crushing apparatus;
• a pressing roller for pressing the target materials conveyed on said feed conveyor and introducing the target materials to said crushing apparatus directly by gripping the target materials with said feed conveyor;
• means for changing a relative positional relationship between said crushing apparatus and a conveying surface of said feed conveyor, to thereby change a crushing angle (θ) formed between a feed direction (X) of the target materials when the target materials are introduced to said crushing apparatus and a line (Y) tangential to said crushing rotor at a position where said crushing bit hits against the target materials;
• and
• wherein said crushing angle is varied among an acute angle, right angle and obtuse angle by said means for changing the relative positional relationship between the crushing apparatus and the feed conveyor.