| 摘要 |
PURPOSE:To provide a counter weight device which can correct easily unbalance of a rotational body with a small number of parts. CONSTITUTION:A circular groove 2 which is coaxial with a rotary shaft A and opens to the rotary shaft A is formed on a rotational body. At least two snap rings 3a, 3b having eccentric mas are fitted to the groove 2. A plurality of cutouts 4 are formed in a circumferential direction of the groove 2, while projections and recessions engaging with the cutouts 4 are formed on the srap rings 3a, 3b to facilitate adjustment of the positions of the snap rings. The positioning is carried out also with certainty. |
