| 摘要 |
<p>PURPOSE: To enable the changeover of the revolutional speed of a motor just before the end of a cassette tape in the state of fast forwarding or unwinding operation by mounting the motor capable of changing over the revolving speed stepwise by providing an electronic governor circuit. CONSTITUTION: A forward flywheel 4 is rotated counterclockwise, but the rotational force of the forward flywheel 4 is not transmitted to a cam gear 7, since the cam gear 7 is engaged with a locking shaft 22b of a trigger lever 22 at the locking part 7f and its tooth lacked part 7c is controlled to the position confronted to a gear part 4b of the forward flywheel 4. The connection for each gear step in the thrust direction is held by holding an engaging part 13d of a winding arm 13 by a holding part 71 of a thrust cam part 7j of the cam gear 7, and the connection for each gear step in the radial direction is held by holding an engaging shaft 24b of a take-up lever 24 by a thrust cam part 7m of the cam gear 7 when the operation is in the forward recording/ reproducing state, and by a thrust cam part 7n of the cam gear 7 when the operation is in the inverse recording/reproducing state.</p> |
