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Browse Prior Art Database

High Speed Head Access Mechanism

IP.com Disclosure Number: IPCOM000089204D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Hunt, RE: AUTHOR [+2]

Abstract

A clutchless gear mechanism provides both high and low gear ratios from a common motor while maintaining precise mechanical timing.

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High Speed Head Access Mechanism

A clutchless gear mechanism provides both high and low gear ratios from a common motor while maintaining precise mechanical timing.

Bracket 5 is rotated in the direction of arrow 2 by the actuation of an electromagnet to withdraw the leadscrew gear 3 from engagement with spindle worm gear 4. This rotation also brings friction drive wheel 6 close to motor wheel
7. Motor 8 is then powered on, and an electromagnet is actuated to pivot motor 8 into friction wheel 6. In this position, the motor 8 is disengaged from the media drive wheel 12. The motor 8 now drives the wheel 6, the gear train 10, and the leadscrew 3 which drives the magnetic head 1.

An emitter wheel 11 is attached to the leadscrew 9 and two sensors (not shown) read the emitter. Two sensors are required to enable the rotation direction of the emitter wheel 11 to be sensed and to prevent the stopping of the emitter with an unstable sensor, causing a counter error in the electronics. A track on the media is defined as 90 Degrees of rotation of the leadscrew 9. Therefore, the desired position is reached on the media by controlling the motor to stop at a 90 Degrees increment of the leadscrew gear 3.

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