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This mechanism converts linear reciprocating motion to accumulative discrete linear movements of a cyclical nature, useful, for example, in positioning a transducer relative to a magnetic recording media.
English (United States)
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Transducer Positioning Mechanism
This mechanism converts linear reciprocating motion to accumulative
discrete linear movements of a cyclical nature, useful, for example, in positioning
a transducer relative to a magnetic recording media.
In Fig. 1, solenoid plunger 16 is connected to pawl carrier 2 by pivot pin 15.
Actuation of plunger 16 by retraction into solenoid 24 rotates pawl carrier 2 in a
clockwise direction which latches pawl 4 into a ratchet tooth of ratchet 3, which
rotates ratchet 3 clockwise. Cam 7 is rigidly attached to ratchet 3 and has the
same pivotal axis 8. Cam 7, therefore, rotates one segment clockwise with
As shown in Fig. 2, cam 7 is divided into 16 equal angular segments 25.
Each angular segment has a dwell section 9, a ramp section 10 and an
associated tooth of ratchet 3 (although only a 12-tooth ratchet is shown in Fig. 1
for clarity.) Section 9 has a constant radius to decrease the angular positioning
accuracy required. Ramp 10 moves cam follower 11 to a new dwell position with
each actuation of the mechanism. A detent ball (not shown) engages one of the
holes 17 at each cam position to restrain further movement of cam 7 until the
next actuation of solenoid 24. Follower 11 is rigidly attached to transducer carrier
12 on which is mounted a magnetic transducer 23. Carrier 12 is slidably
moveable along shaft 13.
Repetitive actuations of solenoid 24 move carrier 12 from the right to the left.
Carrier 12 moves from its extreme lef...