Browse Prior Art Database

Head Positioning Mechanism

IP.com Disclosure Number: IPCOM000052004D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Bowles, DJ: AUTHOR [+5]

Abstract

This is an accurate and yet inexpensive head-positioning mechanism used for positioning a device requiring indexed motion, such as the magnetic head H on a track of a disc rotatable about an axis O.

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Head Positioning Mechanism

This is an accurate and yet inexpensive head-positioning mechanism used for positioning a device requiring indexed motion, such as the magnetic head H on a track of a disc rotatable about an axis O.

The magnetic head H is moved along a pair of rails R through a cam C-cam follower CF arrangement cooperating with a detent spring S. The system is originally in the home position with the cam follower CF located in the cam home detent position P. Access to the first track is performed using a DC motor to rotate the cam C clockwise by an angle X1, through a reduction gear driving a one-way gear attached to cam C. Access to the second track is performed by subsequently driving the cam C for a clockwise rotation of an angle X2, and so on for the other tracks. After the last track has been accessed, the next clockwise cam rotation brings the magnetic head back to home position.

The angle of the detent ramp and the friction of the one-way gear (through the DC motor rotating counterclockwise) will rotate the cam backward to the detent position. When the DC motor is rotated counterclockwise, the one-way gear disengages and the disc rotates about its axis, not affecting the head (H) position.

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