| 摘要 |
In a sound reproducing apparatus for non-rotating plate-shaped or sheet-like sound carriers a pickup comprising a tone arm and a pickup system, is supported to swivel in horizontal and vertical directions on a rotating vertical-axis tone arm table operable by a battery backed driving motor. In order to enable predetermined portions of the spiral-shaped sound groove of the sound carrier to be approached, an abutment cam is provided which is capable of being swivelled into the area of movement of the pickup and engaged therewith. Through a setting knob, adjustable from an outer surface of the housing of said sound reproducing apparatus, said abutment cam can be moved into different radial positions, with respect to the tone arm table axis. When the tone arm table is rotating, the revolving pickup, especially said pickup system, first moves into contact with an engaging edge and is thereby urged toward the tip thereof over which it then slidingly passes, when reaching the desired portion of said sound groove, to scan then the remaining portion thereof.
|
