Browse Prior Art Database

Magnetic Head Load Unload Device

IP.com Disclosure Number: IPCOM000085106D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 48K

Publishing Venue

IBM

Related People

Wheeler, SE: AUTHOR

Abstract

The device is operative for loading and unloading two contact recording magnetic heads 1 and 1a from the surface of a magnetic recording disk 2, utilizing relatively low-power solenoids 18 and 18a effective, respectively, on wedges 21 and 21a made of a low-friction material.

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Magnetic Head Load Unload Device

The device is operative for loading and unloading two contact recording magnetic heads 1 and 1a from the surface of a magnetic recording disk 2, utilizing relatively low-power solenoids 18 and 18a effective, respectively, on wedges 21 and 21a made of a low-friction material.

Magnetic head 1 runs in contact with disk 2 which rotates along with disk drive shaft 3. Head 1 is connected to load beam mount block 4 by a thin, flexible, stainless steel suspension 5. To ensure that the force between head 1 and disk 2 is correct, head 1 is loaded by a load beam 6 and spring 8. Beam 6 pivots in notch 7 in block 4, and spring 8 is so mounted that it tends to rotate beam 6 about notch 7. It should be noted that the angle between the load beam 6 and the spring 8 causes a decreasing spring rate as beam 6 rotates clockwise as seen in the figure.

When loaded, load beam 6 contacts dimple 9 in suspension 5 forcing magnetic head 1 into contact with disk 2. Pick fingers 10 are formed on beam 6 and act to contact suspension 5 and retract head 1 from disk 2, as clockwise motion is imparted to beam 6.

An arm 11 is integrally formed with beam 6 and has a ramp or cam 12, the inside surface 13 of which is coated with a low-friction material such as nylon or TFE. The beam 6 and associated structure just described is attached by block 4 to carriage arm 14, which is an integral part of and can be rigidly attached to carriage 23.

Carriage 23 may be moved in directions A by any suitable mechanism so as to cause magnetic head 1 to traverse radially across disk 2. Arm 14 has a clearance hole or slot 15 allowing arm 11 to protrude through it, and is provided with a low-friction pad 17 on its outer surface just below slot 15.

Solenoid 18 includes a frame 19 which fastens solenoid 18 to arm 14. The armature of solenoid 18...