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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.
English (United States)
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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
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)
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