Apparatus for playing record discs in an automatic mode and an automatic music piece selection mode

摘要

An automatic record disc playing apparatus comprises a tone arm having a connection part onto which a normal head shell having a plurality of terminals for transmitting signals which are picked up by a pickup cartridge and a head shell for automatic music piece selection play are selectively mounted, a circuit for producing a play mode changeover signal according to whether the normal head shell or the head shell for automatic music piece selection play is mounted onto the tone arm, and a circuit for urging the tone arm to perform an automatic music piece selection play operation and a normal play operation according to the play mode changeover signal produced by the circuit for producing the play mode changeover signal. The head shell for automatic music piece selection play has a detection part for detecting the sound groove portions, and the land portions between adjacent music pieces. The tone arm has a plurality of signal transmitting terminals which are connected to terminals for transmitting signals of the normal head shell and the head shell for automatic music piece selection play, and a plurality of terminals exclusively for the detection part which are connected to terminals exclusively for the detection part of the head shell for automatic music piece selection play. The circuit for producing the play mode changeover signal produces a play mode changeover signal according to whether the terminals exclusively for the detection part are or are not interconnected.