Positioning mechanism control circuit

Claim 1

A RECORDING SYSTEM COMPRISING: A RECORDING MEMBER MOUNTED FOR MOVEMENT IN A CERTAIN DIRECTION AND HAVING A PLURALITY OF TRACKS EXTENDING IN SAID DIRECTION AND SPACED TRANSVERSELY THERETO, A RECORDING TRANSDUCER CARRIAGE HAVING A TRANSDUCER MOVABLE ADJACENT SAID RECORDING MEMBER AND TRANSVERSE TO SAID DIRECTION OF MOVEMENT TO DIFFERENT POSITIONS CORRESPONDING TO SAID TRACKS, A RACK HAVING A PLURALITY OF V-SHAPED TEETH SPACED TO CORRESPOND TO SAID TRACKS, SAID RACK BEING TRANSVERSE TO SAID DIRECTION OF MOVEMENT, THE JUNCTION BETWEEN EACH TOOTH DEFINING A STEP POSITION, A SPRING BIASED PAWL MOUNTED ON SAID CARRIAGE FOR ENGAGEMENT WITH THE TEETH OF SAID RACK, A MOTOR COUPLED TO MOVE SAID CARRIAGE WITH RESPECT TO SAID RACK, CONTROL MEANS FOR SELECTIVELY ENERGIZING SAID MOTOR WITH A SOURCE OF POWER FOR MOVING SAID CARRIAGE FROM ONE STEP POSITION TO ANOTHER, SAID ENERGIZATION BEING APPLIED FOR A PREDETERMINED PERIOD OF TIME SUFFICIENT IN DURATION TO CAUSE SAID MOTOR TO MOVE SAID CARRIAGE ALONG SAID RACK A DISTANCE TO MOVE SAID PAWL FROM A STEP POSITION JUNCTION ALONG THE FACE AND OVER THE POINT OF ITS ASSOCIATED TOOTH TO THE OPPOSITE FACE THEREOF, AND A TACHOMETER COUPLED IN DRIVING RELATIONSHIP WITH SAID MOTOR AND SAID CARRIAGE AND ELECTRICALLY COUPLED TO SAID CONTROL MEANS IN A MANNER TO OPPOSE THE ENERGIZATION OF SAID MOTOR BY SAID SOURCE, SAID TACHOMETER BEING EFFECTIVE TO BRAKE THE MOTION OF SAID CARRIAGE AS THE SPRING BIAS OF THE PAWL CAUSES SAID PAWL TO MOVE ALONG SAID OPPOSITE FACE OF SAID ASSOCIATED TOOTH TO ITS ASSOCIATED JUNCTION DEFINING THE NEXT STEP POSITION, WHEREBY OVERSHOOT OF SAID NEXT STEP POSITION IS SUBSTANTIALLY PREVENTED.