Detent servo system

Claim 1

IN COMBINATION WITH A SERVO SYSTEM FOR POSITIONING A MAGNETIC HEAD CARRYING CARRIAGE WITH RESPECT TO A TOOTHED RACK, AN EXTENDIBLE AND RETRACTABLE PAWL MOVABLE MOUNTED TO SAID CARRIAGE AND DISPOSED TO ENGAGE ONE OF THE TEETH OF SAID RACK WHEN IN AN EXTENDED POSITION AND TO BE FREE OF SAID RACK WHEN IN A RETRACTED POSITION, A MOTOR FOR URGING SAID PAWL AGAINST ONE OF SAID TEETH WHEN SAID PAWL IS IN AN EXTENDED POSITION, A SOURCE OF DRIVING VOLTAGE FOR DRIVING SAID MOTOR, A TACHOMETER ASSOCIATED WITH SAID MOTOR TO PRODUCE A VELOCITY VOLTAGE REPRESENTATIVE OF THE VELOCITY OF SAID CARRIAGE, MEANS FOR APPLYING SAID DRIVING VOLTAGE TO URGE SAID PAWL AGAINST A SELECTED TOOTH OF SAID RACK WHEN SAID PAWL IS IN AN EXTENDED POSITION TO MAINTAIN SAID CARRIAGE IN A FIXED POSITION RELATIVE TO SAID RACK, A GATING CIRCUIT, MEANS FOR APPLYING SAID VELOCITY VOLTAGE THROUGH SAID GATING CIRCUIT TO SAID MOTOR TO PROVIDE DAMPING OF THE MOVEMENT OF SAID CARRIAGE DURING THE FINAL STAGE OF A POSITIONING OPERATION, A GATE GENERATOR CIRCUIT TO PRODUCE GATING SIGNALS, AND MEANS FOR APPLYING SAID GATING SIGNALS TO SAID GATING CIRCUIT TO INHIBIT THE APPLICATION OF SAID VELOCITY VOLTAGE TO SAID MOTOR FOR A PREDETERMINED TIME PERIOD TO MINIMIZE THE DAMPING OF SAID CARRIAGE MOVEMENT DURING SAID PREDETERMINED TIME PERIOD.