Abstract: A movable support assembly for supporting a chain-drive board infeed system. The chain-drive board infeed system feeds a board into a board edger or other similar woodworking apparatus. The movable support assembly includes a pair of frame rails for supporting the chain drive infeed system. Bearings are provided for moving the mounting frame in a lateral direction perpendicular to a predetermined infeed line of direction. This enables the mounting frame to be laterally positioned to position a board in a predetermined relationship with respect to a fixed position board edger. The frame rails are maintained in a generally parallel relationship with respect to the given infeed direction by a torque tube and linkage assembly. Both rollway and slide bearings are provided.