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Lead-Screw Access Mechanism for Flexible Disk Drive

IP.com Disclosure Number: IPCOM000046597D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Janssen, DM: AUTHOR

Abstract

In a flexible disk drive having a lead-screw access mechanism, the head assembly carriage is mounted between a guide rod and a lead screw. The lead-screw follower is mounted tangential to the lead screw in a plane defined by the axes of the lead screw and the guide rod. If the follower is so mounted, the lead screw need not be perfectly parallel to the guide rod in that plane in order to avoid recording head indexing error. Fig. 1 is a schematic representation of a head carriage moved along guide rod 12 by lead screw 14 and lead-screw follower 16. Carriage 10 is held in position in a plane parallel to the plane through the axes of the lead screw and the guide rod by guides 18 and guide 20. Guide rod 12 passes through apertures in guides 18, while lead screw 14 passes through an aperture in guide 20.

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Lead-Screw Access Mechanism for Flexible Disk Drive

In a flexible disk drive having a lead-screw access mechanism, the head assembly carriage is mounted between a guide rod and a lead screw. The lead- screw follower is mounted tangential to the lead screw in a plane defined by the axes of the lead screw and the guide rod. If the follower is so mounted, the lead screw need not be perfectly parallel to the guide rod in that plane in order to avoid recording head indexing error. Fig. 1 is a schematic representation of a head carriage moved along guide rod 12 by lead screw 14 and lead-screw follower 16. Carriage 10 is held in position in a plane parallel to the plane through the axes of the lead screw and the guide rod by guides 18 and guide 20. Guide rod 12 passes through apertures in guides 18, while lead screw 14 passes through an aperture in guide 20. Guide 20 also carries lead-screw follower 16 that engages lead screw 14 to translate carriage 10 along rod 12. If lead-screw follower 16 is mounted as shown in Fig. 1 at the top of the lead screw, i.e., in a plane perpendicular to a plane defined by the axes of lead screw 14 and guide rod 12, the lead screw must be perfectly parallel to the guide rod in the direction of head carriage movement. Otherwise, follower 16 will move around the circumference of lead screw 14 as the carriage is indexed by stepping motor 15. This will vary the pitch of the head movement as the carriage is indexed. In the carriage drive of Fig...