Browse Prior Art Database

Cam Controlled Head Load Unload

IP.com Disclosure Number: IPCOM000045300D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Fournier, TR: AUTHOR [+4]

Abstract

In a flexible disk recorder it is critical to minimize wear on the recording head and the disk by controlling the loading and unloading of the head on the disk. Shown above in top view and side view is a cam mechanism for operating the spring-loaded lifting bail that lowers the head onto the disk or lifts the head away from the disk. While only one recording head arm is shown, typically a second recording arm connected in cooperative relationship with the first recording arm moves at the same time so that a recording head is loaded on each side of the recording disk.

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Cam Controlled Head Load Unload

In a flexible disk recorder it is critical to minimize wear on the recording head and the disk by controlling the loading and unloading of the head on the disk. Shown above in top view and side view is a cam mechanism for operating the spring-loaded lifting bail that lowers the head onto the disk or lifts the head away from the disk. While only one recording head arm is shown, typically a second recording arm connected in cooperative relationship with the first recording arm moves at the same time so that a recording head is loaded on each side of the recording disk.

The load/unload mechanism is shown above in a position such that the recording heads would be in contact with the recording disk. To lift the heads off the surface of the disk, stepping motor 10 rotates cam 12 counterclockwise. Cam follower 14, which is a shaft and roller bearing assembly, rolls up onto the upper surface of cam
12. The shaft of cam follower 14 is rigidly attached to spring-loaded lifting bail 16. Accordingly, lifting bail 16 pivots about pin 18 and lifts recording head arm 20.

By controlling the stepping rate of stepping motor 10, the heads can be loaded and unloaded in a very controlled manner. The stepping rate of the stepper motor 10 controls the rotational speed of cam 12 and thus the loading time of the recording heads. The cam profile controls the displacement velocity and acceleration of the bail and thus the recording arm as it lowers or raises...