Patent ID: 7681816

Claim:
A wood crusher comprising: a crushing apparatus including a crushing rotor for crushing target wood to be crushed; a sieve member detachably mounted on the outer peripheral side of said crushing apparatus; sieve member holding means disposed on the outer peripheral side of said sieve member and holding said sieve member in a position on the outer peripheral side of said crushing apparatus; a link mechanism coupled to said sieve member holding means; and extension/contraction drive means coupled to said link mechanism and advancing and retracting said sieve member holding means relative to said crushing apparatus with extension and contraction thereof; wherein said link mechanism moves said sieve member holding means in a direction toward said crushing apparatus when said extension/contraction drive means is extended, and moves said sieve member holding means in a direction away from said crushing apparatus when said extension/contraction drive means is contracted, wherein said link mechanism is coupled to one end of said extension/contraction drive means and comprises a first link member movable in the extending and contracting direction of said extension/contraction drive means, and a second link member having one end rotatably coupled to said sieve member holding means and the other end rotatably coupled to said first link member, and wherein said link mechanism is constituted such that an angle (α) formed between a plane (S 1 ) passing rotation centers of pins at opposite ends of said second link member and a plane (S 2 ) passing the rotation center of said pin which couples said first and second link members and extending in the extending/contracting direction of said first link member is not larger than 90 degrees during crushing work, the angle (α) representing an angle formed above the plane (S 2 ) extending in the extending/contracting direction of said first link member on the side of said pin, which couples said first and second link members, closer to said crushing rotor.