Patent ID: 7418889

Claim:
An index table assembly comprising: a rotary table having a workpiece-receiving surface ( 2 a ) receiving the load of onboard components such as a workpiece; a frame separated from the rotary table in the direction of a rotational axis of the rotary table; a clamping device for causing rotational resistance of the rotary table by bringing the clamping surface of rotary table on the side opposite to the workpiece-receiving surface into contact with the frame by moving the rotary table together with the workpiece-receiving surface along the rotational axis, wherein the rotational resistance is caused by clamping the rotary table against the frame such that the rotary table cannot rotate; a first bearing disposed between the rotary table and the frame; an urging device disposed between the first bearing and the frame such that said urging device is in contact with the first bearing and the frame, and pressing the first bearing against the rotary table at least when the rotary table rotates; and a second bearing disposed between a surface of the rotary table and a surface of the frame facing the surface of the rotary table, said second bearing in contact with both said surfaces thereof, wherein the urging device presses the rotary table against the second bearing at least when the rotary table rotates.