ROTATION-INDEXING TABLE APPARATUS FOR MACHINE TOOL

摘要

In a rotary indexing table device 1 for a machine tool includes a rotating shaft 4 supported rotatably relative to a fixed frame 2 by a bearing 3, a circular table 5 provided at one end of the rotating shaft 4 in a manner such that a workpiece is to be mounted thereon, and drive means 6 for rotating the rotating shaft 4. The drive means 6 is formed by a direct drive motor 9 including a motor rotor 7 provided concentrically with an axis of the rotating shaft 4 in a manner such as to be unrotatable relative to the rotating shaft 4 and a motor stator 8 provided in the fixed frame 2 in a manner such as to face an outer peripheral surface of the motor rotor 7. The bearing 3 is provided on an inner side of the motor rotor 7 in a radial direction, and at least a part of the bearing 3 is provided within an existence area of the direct drive motor 9 in an axial direction of the rotating shaft 4. This reduces of the dimension of the rotary indexing table device 1 in the axial direction of the rotating shaft.