Patent ID: 8038563

Claim:
An index table comprising: a rotary table for setting a workpiece for a machine tool; a rotary table shaft fixedly provided on the rotary table; a driving motor mechanism, which is a driving source; and a planetary roller speed-reduction mechanism including a sun roller, a ring fixed to the speed-reduction mechanism housing, a plurality of planetary rollers arranged at equal angular intervals between the sun roller and the ring in a pressurized state, and a planetary roller harness that fixedly supports a plurality of planetary roller shafts pivotally supporting the planetary rollers in a rotatable manner and is fixedly provided coaxially with the rotary table shaft, wherein a motor output shaft of the driving motor mechanism is used as the sun roller, wherein the index table is provided with: a rotating shaft center hole formed in the shaft centers of the rotary table shaft, the driving motor mechanism, and the planetary roller harness; and a fluid pressure pipe that is disposed in the rotating shaft center hole and is connected to a fluid-operated actuator incorporated in the rotary table.