Electric chuck for machine tool and method of opening or closing gripping pawl of same
AssigneeHitachi Seiki Co., Ltd.
InventorAkira Kosho
Life of this patent
Estimating the term…
Abstract
The present invention relates to an electrically driven chuck for holding a chuck of a machine tool, wherein an electrically driven chuck which has no need of any driving means to be exclusively used for a holding chuck, very simplified, and freely adjustable. Chuck fixing means 40 is locking means for locking a chuck body on a headstock 1. Position-deciding pin driving means 42 includes position-deciding part 43 which has piston 44. The insertion of position-deciding part 43 is inserted into position-deciding hole 41 when pressured air is supplied within cylinder 46. When built-in motor 4 is rotatively driven, both main spindle 2 and scroll 17 are rotatively driven, and jaws 30 move to hold or un-hold a work in the radial direction.
Claims9
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.
Dependencies are inferred from the claim text.