| 摘要 |
<p>PURPOSE:To obtain a small-sized link drive with less number of parts by providing a reduction gear and a link-driving cam which has the same center axis of rotation with said reduction gear and a link-driving cam turned by said reduction gear. CONSTITUTION:A pinion gear 34 is engaged with an epicyclic gear 35 and is driven. The epicyclic gear 35 consists of an internal gear 36, a fixed internal gear 37, an A-planet gear 38, an A-carrier 38, a B-planet gear 42, a B-carrier 43, and a C-planet gear 44. The gear 37 is fixed to a main base 32. The internal gear 36 is transmitted with torque by the A-planet gear 38 and is supported by the A-carrier 41 freely rotatablly. The torque of the A-carrier 41 is decelerated by a B-planet gear 42, and is transmitted to the B-carrier 43. With a gear formed in the B-carrier 43, the C-planet gear 44 engages, so that a mode change- over cam 46 is decelerated and driven at a prescribed speed, and that a cassette- lateralizing head base retreating cam 37 and a cassette-erecting cam 48 are also decelerated and driven at another prescribed speed.</p> |
