| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotation indexing device for a machine tool capable of securing the supporting rigidity of a rotation-side coupling without causing problems on wear due to sliding resistance and on an increasing the number of part items. SOLUTION: The rotation indexing device 10 comprises the rotation-side coupling 21 fixed to a rotation part 11 and a fixation-side coupling 20 fixed to a fixing base 8, both arranged coaxially with each other, a joint coupling 22 opposed to both of the rotation-side and fixation-side couplings 21, 20 in an engageable manner, arranged to be movable between a clamp position, where the rotation-side coupling 21 in engagement is clamped at a rotating angle position and an unclamp position, where it is unclamped, and rollers 40, 41 arranged in upper and lower lines between the rotation-side coupling 21 and the fixation-side coupling 20, the rotation-side coupling 21 being supported by the fixation-side coupling 20 via the roller 40, 41 in lines.
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