Abstract: A multi-function phonograph tone arm control system for a low-friction air bearing supported linear-travelling tone arm system is disclosed. Positive horizontal linear positioning is accomplished by means of an electromagnetic force producing system in which opposing linear forces may be balanced at any point along the path of straight-line travel of the tone arm to position the tone at any desired location. A separate electromagnetic force producing system is utilized to control the vertical pivoting of the tone arm including the pressure of the stylus on a phonograph record. A further motion damping means is provided to stabilize the motion of the tone arm and prevent any unwanted vibration of the tone arm. A means for automatically shutting off the system at the end of a record is also provided.

Abstract: An improved phonograph tone arm device is disclosed in which the pickup, including the stylus, is supported on a low friction air-bearing support which provides for essentially frictionless movement of the tone arm and pickup both in horizontal linear travel and vertical pivoting to assure proper stylus pressure. The tone arm support system includes a support member having an upper surface which is shaped as a right circular trough or cylinder section and a floating member which has a juxtaposed matching convex or concave lower surface. A recess in the lower surface of the floating member forms a plenum to which air is supplied from one or more openings in the support member. The length of the plenum is such that the supply openings are always beneath the plenum confines during the full traverse of the stylus across a record to be played to minimize the amount of air required and maximize uniformity of support for the floating member.