Swing-arm arrangement for a magnetic disc storage apparatus

A swing arm arrangement for moving and positioning a magnetic head over a surface of a rigid rotatable magnetic disc of an apparatus for the storage and reproduction of digital data, which arrangement comprises:

• a swing arm pivotal about an axis and having an end remote from the pivotal axis;
• a flat control coil connected to the swing arm;
• a permanent magnetic stator including
• a stator frame,
• a plurality of flat, axially magnetized permanent stator magnets connected to the stator frame, the magnets forming an air gap for the control coil and being arranged such that the coil is movable in an axial permanent magnetic field within the air gap formed between the permanent stator magnets, the stator frame including
• a pair of iron stator end plates substantially defining two outer sides of the permanent magnetic stator, the plates extending over the control coil and the stator magnets, the magnets being mounted on the plates;
• and
• a bearing arrangement, associated with the swing arm, for pivotally journalling the swing arm, the bearing arrangement comprising two ball bearings each having an inner race, the bearing arrangement further comprising a pivotal bearing pin coaxial with the pivotal axis, the swing arm and the inner races of the ball bearings being mounted on the bearing pin,
• characterized in that the swing arm is arranged between the two ball bearings, and each of the stator plates extends transversely of the pivotal axis, intersects the axis and further extends in a direction generally toward the remote end of the swing arm, each plate carrying one ball bearing.