Adjustable air bearing supported magnetic head

Claim 1

A MAGNETIC HEAD ASSEMBLY OF THE TYPE WHEREIN A MAGNETIC HEAD IS ADAPTED TO RIDE ON A HYDRODYNAMICALLY CREATED FILM OF AIR ADHERING TO THE SURFACE OF A RAPIDLY MOVING MAGNETIC DRUM, THE HEAD ASSEMBLY COMPRISING; A MAGNETIC HEAD ELEMENT, A PIVOTABLE HEAD SUPPORTING MEMBER, A REED SPRING CONNECTING THE HEAD TO THE HEAD ELEMENT AND PROVIDING A LOADING FORCE FOR THE MAGNETIC HEAD ELEMENT, A SUPPORT HOUSING JOURNALING THE HEAD SUPPORTING MEMBER FOR PIVOTABLE MOVEMENT, A BIMETAL MOTOR OPERATIVELY CONNECTED TO THE PIVOTABLE HEAD SUPPORTING MEMBER FOR DRIVING IT IN OPPOSITE DIRECTIONS TO MOVE THE HEAD FROM OPERATIVE TO INOPERATIVE POSITIONS, AN ELECTRICAL RESISTANCE ELEMENT POSITIONED ADJACENT THE BIMENTAL MOTOR AND ADAPTED TO BE SELECTIVELY ENERGIZED TO PIVOT THE SUPPORTING MEMBER A DIFFERENTIALLY THREADED SCREW IN SAID SUPPORT HOUSING, A NUT ON ONE END OF THE DIFFERENTIALLY THREADED SCREW ADAPTED TO FUNCTION AS A LIMIT STOP, SAID NUT BEING IN THE PATH OF MOVEMENT OF THE PIVOTABLE HEAD SUPPORT MEMBER TO LIMIT THE MOVEMENT THEREOF AND ACCURATELY CONTROL THE LOADING FORCE WHICH THE HEAD APPLIES TO THE AIR FILM AND THE POINT OF TANGENCY OF THE HEAD.