Patent ID: 6139028
Filing Date: 2000-10-31
Classification: B23B,Y10T

Abstract:
An electrically driven chuck of a machine tool comprising;a main spindle, said main spindle being rotatively mounted on a headstock,a main spindle motor for driving said main spindle,a scroll, said scroll being engaged with said main spindle, wherein a scroll groove is helically formed within said scroll,a chuck body, said chuck body being rotatively mounted on the peripheral portion of said scroll,holding members, said holding members being mounted on said chuck body, said holding members including the respective scroll teeth which engage with said scroll groove, said holding members being movable in the respective radial directions,a chuck fixing means, said chuck fixing means being mounted on a body of said machine tool, said chuck body is relatively fixed with said body in relation to said body, said chuck fixing means engaging or disengaging with said chuck body, said chuck fixing means engaging with said chuck body when said holding members operate to open or close in order to fix the motion of rotation of said chuck body.