Siemens Aktiengesellschaft

Wilhelm Brand

Otto Olbrich

Johann Biermeier

Albert Dierkes

Vaclav Vanek

Franz Jakobec

A magnetic disk memory comprises a hub rotatably seated at both ends in a one-piece supporting shell of a housing and carrying at least one storage disk and driven by an internal drive motor. The hub is fixed on a rotating spindle, whereby a pair of ball bearings is provided for seating the spindle at mutually opposite walls of the supporting shell. The ball bearings are embraced in the axial direction in order to achieve a play-free spindle guidance. Each ball bearing has an inner ring fixed with an interference fit onto a respective end of the spindle and a respective bearing bushing likewise seated with an interference fit on its outer ring. One of the two bearing bushings is rigidly disposed in the allocated wall of the supporting shell and, in the incorporated condition of the hub, the other bearing bushing is fixed at the opposite wall of the supporting shell and is prestressed in the axial direction.

Magnetic disk memory comprising a membrane spring-braced bearing of a

A housing for a magnetic disk memory comprising a disk pack rotatably seated at both sides and a rotational positioner is subdivided along a parting plane parallel to the axes of the disk pack and the rotational positioner, being subdivided into a tub-shaped supporting shell and into a cover. Both bearing locations for the disk pack lie just within the edge of the supporting shell and the immersion depth of the rotational positioner into the supporting shell is as small as possible. As a base, the supporting shell comprises an end wall inclined at a predetermined angle relative to the parting plane, the inside of the end wall, however, comprising an attachment surface aligned parallel with the parting plane in the attachment region of the rotational positioner. Outwardly directed webs are provided on the outer surface of the end wall and extend at right angles with respect to one another for the purpose of reinforcement.

Housing for a magnetic disk memory having a disk pack seat at opposite

A positioning mechanism for a magnetic fixed (or hard) disk storage unit incorporates a bearing block forming part of the magnet system for the rotational positioner, and carrying a positioning shaft. A pivot member rotationally seated on the shaft has pivot arms carrying magnetic heads and brackets for carrying the magnetic coil for positioning the heads. A pulse operated detent magnet is provided and incorporates a stop armature. The armature is biased into detent retaining position, but is restrained by retaining spring in mechanically self-holding condition. It is automatically released when the pivot member swings into the detent position, corresponding to the landing zone for the magnetic heads.

Apparatus for positioning a magnetic disk read head with pulse operated

In a magnetic disk memory comprising a disk pack hub seated at both sides in ball bearings in a housing, the ball bearings are tensed in the actual direction relative to one another in order to achieve a play-free hub guidance. To this end, at least one housing wall is resiliently designed in the direction of the hub axis and flexes upon the application of a restraining force. Before integration into a completed memory unit, the spacings of the inner rings of the ball bearings, tightly seated on the hub shaft, and of the bearing locations in the housing which accept the outer rings with an interference fit, deviate slightly from one another.

Magnetic disk memory having a disk pack hub seated at both sides of a

A wire is wound on a coil body form about a removable mandrel in a first layer in which the turns abut one another. A guide ring reverses the direction of lead of the wire to form a second, overlying layer in which the turns are spaced a short distance apart from one another. The final turns of the outer layer engage about the coil form. A casting agent applied to the coil penetrates the turns of the second and first layers and is hardened. The mandrel is removed and the coil is self-supporting, for use as in a moving-coil motor. A fiberglass sheet may optionally be applied about the first layer before the second layer is wound thereover to increase the strength of the coil.

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Rosenheim, Germany

Wilhelm Brand