| 摘要 |
<p>A tape head indexing assembly for a cartridge type tape player includes a first lever arm, one end of which is coupled pivotally to a pawl engageable with a ratchet wheel mounted on a rotatable tape head indexing cam. The opposite end of the first lever arm is attached to a first end of a coil spring included in a bistable mechanism; the opposite end of the coil spring being attached to the free end of a second lever arm also included in the bistable mechanism. Energization of a low power solenoid mounted adjacent the second lever arm pulls in the armature to snap the second lever arm from a first to a second stable position; the last described movement also pivoting the first lever arm to rotate the indexing cam in a first direction. A reset pin on the capstan flywheel of the tape player engages the first lever arm to return it to its original position and also to restore the bistable mechanism to its original state. Restoration of the first lever arm operates the pawl and ratchet to complete the rotation of the tape head indexing cam in the first direction.</p> |
