Operating mode switching mechanism for a tape recorder

摘要

An operating mode switching mechanism for a tape recorder for effecting various operations in response to operation of manually operating keys comprises a single solenoid for causing a rotary wheel to start rotating so that various operations are selectively performed depending on the duration for which the solenoid is energized by moving a carrier plate carrying thereon an electromagnetic transducer head, between first and second positions. The rotational angle of the rotary wheel is detected by a photo sensing means, and the detected angle will be used in an electrical circuit in which three different pulses for energizing the solenoid are selectively produced in accordance with the selected operating key and the detected rotational angle of the rotary wheel. Energization interval of the solenoid is, thus synchronized with the rotation of the solenoid thereby providing accurate operating mode switching operations.