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Magnetic Head Restoration Mechanism

IP.com Disclosure Number: IPCOM000082338D
Original Publication Date: 1974-Nov-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Larson, CA: AUTHOR

Abstract

This mechanism automatically restores drive mesh for a magnetic head 10, traveling over a magnetic disk 12 and driven by a threaded follower wheel 14 in mesh with a lead screw 16, when head 10 has overrun either limit of its travel.

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Magnetic Head Restoration Mechanism

This mechanism automatically restores drive mesh for a magnetic head 10, traveling over a magnetic disk 12 and driven by a threaded follower wheel 14 in mesh with a lead screw 16, when head 10 has overrun either limit of its travel.

Head 10 is fixed on a carriage 18 slideable on a fixed guide rod 20, and wheel 14 is rotatably disposed on an extension 18a of carriage 18. Screw 16 has a spiral groove 16a therein, and wheel 14 has an external thread 14a which travels in groove 16a. Wheel 14 is held in such mating engagement with screw 16 by any suitable retaining means. Stepper motor 22 is connected to screw 16 for driving screw 16 either in steps or in continuous rotation, causing carriage 18 to move longitudinally along guide rod 20 to thereby move head 10 across the surface of disk 12 in corresponding movements.

Screw 16 has reliefs 24 and 26 on opposite ends into which thread 14a may move when carriage 18 and head 10 overrun. Overtravel return springs 28 and 30 are effective on carriage 18, when thread 14a travels out of groove 16a at the ends of travel of carriage 18 and head 10. Carriage 18 carries a reflecting light pipe 32. Pipe 32 is adapted to register with the light transmitting and receiving openings 34a and 36a in photosensors 34 and 36, disposed at opposite ends of travel of carriage 18.

When carriage 18 and magnetic head 10 overtravel, thread 14a travels out of groove 16a in lead screw 16 to break the driving connec...