| 摘要 |
A linear positioner particularly useful for rapidly and precisely positioning heads with respect to a magnetic disc recording surface. The positioner includes a linear motor having a cylindrical core of magnetically permeable material and a motor housing, also of permeable material, closely magnetically coupled to the ends of the core. Permanent magnets are mounted on the inner surface of the housing, between the ends thereof, to produce a magnetic field across an air gap to the core which is of substantially uniform density along the length of the core. A coil assembly, including a rigid edge-wound drive coil mounted around the core in the air gap, is supported for horizontal movement along the core by a plurality of roller bearings. The roller bearings are mounted on bearing support rods secured to the drive coil structure and spaced around the circumference thereof. Some of the bearings are mounted for rotation about vertical spindle axes so as to engage vertical rail surfaces while other bearings are mounted for rotation about horizontal spindle axes so as to engage horizontal rail surfaces. At least some of the bearings are flexibly mounted in order to preload the bearings and assure that they roll properly on the rail surfaces.
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