Abstract: A magnetic head feeding device suitable for mass production while providing a higher tolerance to vibration and shock is provided. A carriage is rotatably and slideably mounted on a guide shaft. A magnetic head is mounted on the carriage as is a rack. A pinion mounted on a motor, engages the rack to move the rack along the guide shaft in a reciprocating fashion when the pinion is rotated. A magnetic coupling between the carriage and a fixed support provides an attractive force which acts as an engagement force between the rack and the pinion without applying a contact force on the carriage. A stop is provided at each end of the rack and is integrally formed with the rack so that the stop prevents the pinion from rotating and the carriage from moving once the carriage has reached a desired outer limit of motion in either direction. A contour wall is integrally formed with the rack at a position opposed to the rack to prevent disengagement of the pinion from the rack.

Abstract: A disc drive for a disc including a disc rotating apparatus comprising a rotating shaft for being received within a first aperture of the disc. A spindle is affixed to the shaft. The spindle has a surface disposed in a plane perpendicular to the shaft, for supporting the disc. The disc drive includes a position controlling member received in a second aperture of the disc, a rigid member for controlling the position of the position controlling member, and a biasing member for urging the rigid member in at least one direction so that the position controlling member engages the disc. A centering force to center the disc on the disc rotating apparatus is produced due to the action of the position controlling member on the disc. The biasing member may be configured so as to act upon the rigid member in an additional direction to produce an additional centering force component when the position controlling member engages the disc, thus urging sides of the first aperture of the disc against the rotating shaft.

Abstract: A disc drive for a disc including a disc rotating apparatus comprising a rotating shaft for being received within a first aperture of the disc. A spindle is affixed to the shaft. The spindle has a surface disposed in a plane perpendicular to the shaft, for supporting the disc. The disc drive includes a position controlling member received in a second aperture of the disc, a rigid member for controlling the position of the position controlling member, and a biasing member for urging the rigid member in at least one direction so that the position controlling member engages the disc. A centering force to center the disc on the disc rotating apparatus is produced due to the action of the position controlling member on the disc. The biasing member may be configured so as to act upon the rigid member in an additional direction to produce an additional centering force component when the position controlling member engages the disc, thus urging sides of the first aperture of the disc against the rotating shaft.

Abstract: A carriage movement device for a magnetic memory device having a carriage with a first end and a second end, the carriage being slidably supported on a rod is provided. The carriage movement device has a capstan which is angularly rotated by a driver and a belt having an elongated slot extending form a portion of the belt having the second width, the slot being at least as wide as the first end wrapping around the capstan. A first belt connector connects the first end of the belt to the first end of the carriage. A second belt connector connects the second end of the belt to the second end of the carriage. The second end of the belt is affixed to a second belt connector which is selectively engaged to the second end of the carriage by stretching the belt about the carriage and or deflecting an elastic projection formed on the carriage. The angular rotation of the capstan is accurately converted into linear movement of the carriage.

Abstract: In a magnetic head-positioning device using a coil motor, a position sensor detects the median position between one track and an adjacent track so as to decelerate and stop the moving head at the adjacent track. The magnetic head is transferred over a distance of many tracks by acceleration to the median positions and repeating the operation described above. A pair of flip-flops enables the magnetic head to move from one track to another one and a summing amplifier weights inputs from a position sensor, speed sensor and feed circuit to control motion of the voice coil motor.