| 摘要 |
PROBLEM TO BE SOLVED: To drive the power of a rotary table without requiring center alignment between the rotary table and a base. SOLUTION: A rotary table 2 is disposed on a base 1 while being supported at its outer periphery lower face in a freely rotatable manner and a driving wheel 4 is disposed on a supporting plate 3 oscillatably provided in a plane in parallel to the rotational plane of the rotary table 2 on the base 1 so as to be rotatable in a plane in parallel to the supporting plate. A motor 41 disposed on the suporting plate 3 is linked to the driving wheel 4 and abutted to the annular inner face 26 of the rotary table 2 for energization and two positioning rollers 5, 5 supported at fixed positions on the base 1 and the driving wheel 4 are abutted to the annular inner face 26. A contact point between the driving wheel 4 and the annular inner face 26 and a contact point between both rollers 5, 5 and the annular inner face 26 are located at the apex of a virtual acute triangle.
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