Saw machine riving knife adjustment mechanism

An adjustable riving knife assembly installed in a machine base having a top wall, the adjustable riving knife assembly comprising:

• a locating member disposed below said top wall of said machine base, and including a track defined thereby, said track extending along a longitudinal axis toward said top wall of said machine base;
• a riving knife having a coupling portion adjustably and slidably inserted into said track of said locating member so as to be adjustable in a longitudinal direction along said longitudinal axis;
• and
• a locking unit disposed below said top wall of said machine base and installed on said locating member, said locking unit comprising a brake and a locking member, said brake including a brake portion eccentrically disposed with respect to a rotation axis, said brake rotatable about said rotation axis to lock said riving knife with or release said riving knife from said locating member, and said locking member having a circular sleeve portion defining a through hole;
• wherein said locking unit further comprises an axle holder and an operating member, said axle holder affixed to said locating member, and said operating member connected to said brake, said brake portion received in the through hole of the sleeve portion and rotatably mounted to said axle holder so that the brake portion is eccentrically rotatable about said rotation axis, the rotation axis extending perpendicular to said longitudinal axis and intersecting said track, said locking member being movable by said brake portion and having a retaining portion inserted into said track, said operating member operable to rotate said brake causing said brake portion to move said locking member between a locking position, where said retaining portion engages and locks said riving knife to said locating member, and an unlocking position, where said retaining portion is disengaged from said riving knife for allowing movement of said riving knife relative to said locating member.