| 摘要 |
A reel disc driving device for a video cassette recorder comprises a clutch wheel disposed between a driving pulley and a driving gear, which can directly transmit the driving force of the pulley to the gear depending on the selection of operating mode. Mounted to a cylindrical hub of the pulley is a torque generating mechanism which can produce variably a torque required for driving the gear. The variable torque generating mechanism includes a pair of one-way clutch springs coupled to the hub of the pulley and the gear, resepectively, which is actuated in an opposite relationship with each other so that the torque is variably adjusted upon the switching of selected operating mode, maintaining constantly the rotating torque of the gear for each of the operating modes.
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