Patent ID: 8622792

Claim:
A sieve adjustment mechanism comprising: a rack gear movable between a first and a second position and connectable to a sieve segment of a sieve for a sliding movement of the sieve segment in a plane thereof between a first sieve position and a second sieve position, the sliding movement in the plane of the sieve for an adjustment of a sieve size; a pivot handle having a pinion gear at a first end of the pivot handle for operatively engaging the rack gear for moving the rack gear between the first and second positions and a second end opposite the first end, wherein the pinion gear is rotatable about a first axis; and an actuator connected to the second end for pivoting the pivot handle about the first axis to move the rack gear between the first and second positions, actuation of the actuator induces a force along a single direction on the rack gear via a pivot, the single direction mitigates a lost motion in the pivot during the adjustment of the sieve size, the single direction parallel to a length of the rack gear.