| 摘要 |
<p>A mechanism for automatically returning a tone arm of a toy phonograph from the final to the starting positions of a reproduction. A swingable rod is provided for lifting an intermediate sound transmitting body which usually depresses the tone arm, when the tone arm has been brought to the final position of the reproduction, so as to allow the reproducing needle carried by the tone arm to be disengaged from the recording groove, thereby enabling the tone arm to return. The upward movement of the swingable rod is initiated by an engagement of the rod with a cam contour formed on the drive shaft for the record disc. In order that the swingable rod may correctly ride on the cam contour, so as to be lifted by the latter to make the tone arm free from the depressing force of the intermediate sound transmitting body, there is provided a buffer resilient body adapted to absorb the movement of the swingable rod and the movement of the tone arm which presses the rod toward the cam. By the absroption of these movements, the tone arm is allowed to swing, even after the swingable rod has collided with the higher side of the cam contour, so as to make the swingable rod stationary until the lower side of the cam contour, on which the swingable rod is destined to ride, is brought to confront the swingable rod.</p> |
