| 摘要 |
A device for variably adjusting a moment of inertia of a drum of a videocassette recorder. The device comprises a plurality of inertial masses adapted to add a variable increment of a moment of inertia to a moment of inertia of the drum. In virtue of the possibility of varying the moment of inertria of the drum, it is possible to check the frame condition of the recorder, and thus, to obtain an optimum frame condition.
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