Abstract: A thrust ball-bearing in which a good lubrication is maintained for a long period of time and having a long service life. The bearing comprises a plurality of balls having a uniform diameter, a retainer which retains the balls, and two plates situated at either side of the retainer and rotatable relative to each other via the balls. The retainer has a thickness less than the diameter of the ball. A plurality of holes that retain each ball is provided on the retainer and a groove having a rectangular cross section is formed in a portion between two adjacent holes. An amount of grease applied to the ball is collected inside the groove and provided to the ball located on the downstream side of flowing grease without moving outwardly of the groove even if a centrifugal force generated by a rotation of the bearing is exerted.

Abstract: A motor positioning method includes steps of: providing a frame of a disk drive apparatus having locating holes spaced apart from each other, the locating holes being located in accordance with a predetermined positional relationship between the locating holes and a target position; placing a positioning jig on a base surface, the positioning jig having a first connecting portion with a diameter corresponding to a reference opening at the target position and second connecting portions with diameters corresponding to respective ones of the locating holes, the second connecting portions and the first connecting portion being located in accordance with the positional relationship; placing the frame onto the positioning jig so that the second connecting portions are fitted into the locating holes; and placing a board having a drive motor, a shaft and the reference opening at the target position, onto the frame attached to the jig so that the first connecting portion is fitted into the reference opening, thus posi

Abstract: A head loading mechanism for a flexible disc drive unit, for bringing and withdrawing a magnetic read/write head in contact with and from a flexible magnetic disc comprises a disc loading member rotatably supported in the disc drive unit, for positioning the magnetic disc at a fixed position wherein the magnetic disc is rotatably held; head loading member rotatably supported in the disc drive unit, for carrying the magnetic head; a head load bail member rotatably supported in the disc drive unit, for positioning the magnetic head over the magnetic disc with a gap (g.sub.1) in a state where the bail member makes contact with the hed loading member; and an adjusting mechanism for adjusting a rotational position of the bail member with respect to the head loading member so that the gap (g.sub.1) is varied.