US 4,791,502 AGranted

Apparatus for positioning a reading-recording head on a disc

AssigneeIng. C. Olivetti & C., S.p.A.

InventorSergio Tronzano

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Abstract

A magnetic head is mounted on a carriage which is movable radially with respect to a disc. The carriage is slidable on two balls rolling in a groove in a guide pivoted to the base and pressed against the carriage by a spring. The carriage is moved by a drive roller which rolls against a track on the carriage opposite to the guide. The roller is connected to the carriage by means of a flexible metal strip which is fixed to the roller at the center and to the carriage at its ends. The guide which is pivoted on the base makes it impossible automatically to take up clearances between the carriage and the guide. The carriage may be of very small dimensions and weight so that the reduced inertia of the carriage enhances the degree of precision of the movements of the head from one track on the magnetic disc to another.

Claims8

Dependent claims

Apparatus for positioning a reading-recording head relative to a rotating recording disc, comprising a rotary motor having rotating driving means and mounted on a base member of the apparatus, a carriage for said head moved by said driving means in a radial direction to position said head on said disc, a guide extending parallel to said radial direction and pivotally mounted on said base, said carriage and said guide each comprising one guiding groove, said grooves being faced to each other and parallel to said direction for accommodating two rolling elements to support and guide said carriage in said radial direction, and biasing means interposed between said guide and said base to urge the guide against the carriage, said rolling elements being located in said grooves at position spaced apart in opposite directions with respect to said driving means, whereby the thrust of said guide on said carriage arising from said biasing means is absorbed by said driving means.

Dependencies are inferred from the claim text.