| 摘要 |
<p>PURPOSE:To surely prevent reverse rotation of a cassette tape recorder etc. by putting a boss at the undersurface of a gear in engagement with a detent boss furnished on a leaf spring to press said gear in the axial direction, when the gear rotates reversely. CONSTITUTION:When, in a cassette tape recorder etc., a motor rotates a pulley 12 to cause rotation of a partial cogged gear 34 clockwise through an endless belt 24, pulley 20 and gears 28, 30, a swing lever 79 begins swinging to cause displacement of a head table inward and also rotation of a pinch roller. Here a detent boss 232 is provided at a flat plate part 230a below the abovementioned partially cogged gear 34, and a leaf spring 230 with folded parts 230d, 230e in approx. triangular shape is furnished on one of the sides of said flat plate part 230a. When the gear 34 is going to rotate in the reverse direction, a boss 73 provided at the side of this gear 34 is engaged with the detent boss 232 to surely prevent reverse rotation.</p> |
