Tone arm assembly

A tone arm assembly comprising a tone arm having a stylus at one end thereof;

• mounting means mounting said tone arm for vertical and horizontal movements in respect to a turntable;
• first motor means mechanically coupled to said tone arm for moving said tone arm in the vertical direction with respect to a record disc on the turntable;
• second motor means mechanically coupled to said tone arm for moving said tone arm in the horizontal direction with respect to said record disc and having an electrically energizable coil;
• a first motor drive circuit for energizing said first motor means so as to move said tone arm between an inoperative up-position and a reproducing position on said record disc;
• a second motor drive circuit for energizing said second motor means in such a manner that said tone arm is moved between an inoperative rest position and said up-position above said reproducing position on said record disc, said second motor drive circuit including a first series circuit having a first transistor connected to a first power source, a second series circuit having a second transistor connected in series with a second power source and said coil of said second motor means, and a third transistor connected to said coil of the second motor means;
• brake circuit means for supplying a current to said second motor means so as to brake the latter while said second motor means is energized by said second motor drive circuit;
• and an inside force cancelling circuit controlling said third transistor so that a force for cancelling an inside force is applied through said second motor means and said tone arm to said stylus.

A tone arm assembly comprising a tone arm having a stylus at one end thereof;

• mounting means mounting said tone arm for vertical and horizontal movements in respect to a turntable;
• first motor means mechanically coupled to said tone arm for moving said tone arm in the vertical direction with respect to a record disc on the turntable;
• second motor means mechanically coupled to said tone arm for moving said tone arm in the horizontal direction with respect to said record disc and having an electrically energizable coil;
• a first motor drive circuit for energizing said first motor means so as to move said tone arm between an inoperative up-position and a reproducing position on said record disc;
• a second motor drive circuit for energizing said second motor means in such a manner that said tone arm is moved between an inoperative rest position and said up-position above said reproducing position on said record disc, said second motor drive circuit including a first series circuit having a first transistor connected to a first power source, a second series circuit having a second transistor connected in series with a second power source and said coil of said second motor means;
• brake circuit means for supplying a current to said second motor means so as to brake the latter while said second motor means is energized by said second motor drive circuit;
• and a lateral balancing circuit connected to said second motor drive circuit for applying a lateral force through said first series circuit to said stylus, said lateral balancing circuit including a variable resistor for varying said lateral force in correspondence with the adjustment of said variable resistor.

A tone arm assembly comprising a tone arm having a stylus at one end thereof, mounting means mounting said tone arm for vertical and horizontal movements in respect to a turntable, first motor means mechanically coupled to said tne arm for moving said tone arm in the vertical direction with respect to a record disc on the turntable, second motor means mechanically coupled to said tone arm for moving said tone arm in the horizontal direction with respect to said record disc, a first motor drive circuit for energizing said first motor means so as to move said tone arm between an inoperative up-position and a reproducing position on said record disc, a second motor drive circuit for energizing said second motor means in such a manner that said tone arm is moved between an inoperative rest position to said up-position above said reproducing position on said record disc, detecting means for detecting whether or not said tone arm is positioned in said rest position at the start of an operating cycle of said tone arm, and circuit means for energizing said second motor drive circuit to return said tone arm to said rest position when said detecting means detects that said tone arm is not positioned on said rest position and for energizing said second motor drive circuit to move said tone arm toward said record disc when said detecting means has detected that said tone arm has returned to said rest position.

A tone arm assembly comprising a tone arm having a stylus at one end thereof, mounting means mounting said tone arm for vertical and horizontal movements in respect to a turntable, first motor means mechanically coupled to said tone arm for moving said tone arm in the vertical direction with respect to a record disc on the turntable, second motor means mechanically coupled to said tone arm for moving said tone arm in the horizontal direction with respect to said record disc, a first motor drive circuit for energizing said first motor means so as to move said tone arm between an inoperative up-position and a reproducing position on said record disc, a second motor drive circuit for energizing said second motor means in such a manner that said tone arm is moved between an inoperative rest position and said up-position above said reproducing position on said record disc, brake circuit means for supplying a current to said second motor means so as to brake the latter while said second motor means is energized by said second motor drive circuit, detecting means for detecting the speed of horizontal movement of said tone arm, and circuit means supplied with the output of said detecting means for supplying a predetermined output to said second motor drive circuit while said tone arm is moved at a predetermined speed, said tone arm being braked through said second motor drive circuit by the last-mentioned circuit means when said tone arm is moved at a speed higher than said predetermined speed.

A tone arm assembly comprising a tone arm having a stylus at one end thereof, mounting means mounting the tone arm for vertical and horizontal movements in respect to a turntable, first motor means mechanically coupled to said tone arm for moving said tone arm in the vertical direction with respect to a record disc on the turntable, second motor means mechanically coupled to said tone arm for moving said tone arm in the horizontal direction with respect to said record disc, a first motor drive circuit for energizing said first motor means so as to move said tone arm between an inoperative up-position and a reproducing position on said record dics, a second motor drive circuit for energizing said second motor means in such a manner that said tone arm is moved between an inoperative rest position and said up-position above said reproducing position on said record disc, signal generating means mechanically coupled to said tone arm for generating a control signal in response to the horizontal movement of said tone arm, a speed control circuit connected between said signal generating means and said second motor drive circuit, said speed control circuit supplying a drive signal to said second motor drive circuit when a predetermined amount of said control signal is supplied to said speed control circuit, detecting means for detecting when said tone arm has been positioned above the record disc, a system control circuit supplied with an output from said detecting means and with said control signal, means for shutting off said second motor drive circuit in response to an output of said system control circuit, and means for energizing said first motor drive circuit after said tone arm has been positioned above the record disc.