US Patent 7372671 Disk apparatus

A head beam is retained at a front portion of the pivoting arm so as to be rotatable, and is continuously urged by an urging member in the counterclockwise direction. The pivoting arm has a directing rod rotating around a supporting shaft. A slidable projection of the directing rod is slidably in contact with a beam rod, and a fixed supporting point is also slidably in contact with the directing rod. Accordingly, when the pivoting arm rotates, the operational reference line of the magnetic head is oriented along the tangential direction. Due to continuous urging force by the urging member, the direction of the magnetic head is continuously stabilized.