Track positioning arrangement in a head wheel for a recorder

摘要

A rotating head wheel for a recorder wherein the head wheel is additionally displaceable in the direction of its axis of rotation. The displacement is produced by mounting the head wheel on a threaded spindle which rotates in the same direction as the head wheel and whose rate of rotation is variable. A first sensor generates a pulse each revolution of the head wheel. A second sensor generates a pulse each revolution of the threaded spindle. The pulses of the first and second sensors and a pulse produced by a position sensor are used for controlling the magnitude of the displacement.