Patent ID: 6697229
Filing Date: 2004-02-24
Classification: G11B

Abstract:
A head transfer mechanism for moving a head assembly up and down in an axial direction extending in a vertical direction, wherein said head transfer mechanism comprises:a lead screw with a thread ridge having a rotation center axis extending in said axial direction; a head elevation guiding member including as an integral structure a head lift with said head assembly mounted thereon and a head guide having a thread groove engaged with said lead screw and serving to move said head lift up and down along said rotation center axis following said rotation of said lead screw, said head lift having a through hole receiving said lead screw inserted therethrough and a hollow opened portion formed at its center; a preload bushing arranged in said hollow opened portion of said head lift and having a thread groove engaged with said lead screw; and a compression coil spring arranged in said hollow opened portion of said head lift between said preload bushing and said head lift for applying said head lift with a pressing force in said axial direction of said lead screw; the head assembly being given a biasing load within said head elevation guiding member in a radial direction of said lead screw.