| 摘要 |
<p>PURPOSE:To prevent a cassette from jumping out and to improve the operating feeling by providing a damper between a driving arm and a worm wheel and damping a swift movement of the driving arm due to a radical return of a spring by a damper action. CONSTITUTION:When the cassette 1 is instantly let go at the same time that a switch 7 becomes on by inserting the cassette 1 into a cassette holder 2, the spring 5 pulls the driving arm 4 so as to return radically to its original state, but by the damper action which is effective by injecting a grease state viscous body 21 into between an annular protrusion 19 provided on the driving arm 4 and an annular groove 20 provided on the worm wheel 12, a boss 14 is prevented from coming into collision with the side of a hole 13. By damping the swift movement of the driving arm 4 with a viscous drag of the viscous body 21, the cassette 1 is prevented from jumping out, while the operating feeling is improvable.</p> |
