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Variable Spring-Rate Complaint Guide

IP.com Disclosure Number: IPCOM000041404D
Original Publication Date: 1984-Jan-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Smith, KL: AUTHOR [+2]

Abstract

In a magnetic tape drive it is essential that the tape passage over the magnetic head be precisely controlled. This may be accomplished by feeding the tape over guide bearings. In one type of guide bearing, one edge of the tape is held against a flange by a spring-biased guide pressing against the other edge of the tape. The provision of a spring biased guide having a uniform spring rate across the arc of the guide sometimes results in buckling the tape at the entrance to the guide when the spring constant of the guide is sufficient to retain the tape edge against the flange. This can be overcome by providing a spring-biased guide having a variable spring rate across the arc of the guide. The figure shows a pair of guide bearings 2 and 3. Bearing 2 is shown in an exploded view.

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Variable Spring-Rate Complaint Guide

In a magnetic tape drive it is essential that the tape passage over the magnetic head be precisely controlled. This may be accomplished by feeding the tape over guide bearings. In one type of guide bearing, one edge of the tape is held against a flange by a spring-biased guide pressing against the other edge of the tape. The provision of a spring biased guide having a uniform spring rate across the arc of the guide sometimes results in buckling the tape at the entrance to the guide when the spring constant of the guide is sufficient to retain the tape edge against the flange. This can be overcome by providing a spring-biased guide having a variable spring rate across the arc of the guide. The figure shows a pair of guide bearings 2 and 3. Bearing 2 is shown in an exploded view. Tape 1 is fed through bearings 2 and 3 and across the magnetic head 4. Bearings 2 and 3 are identical. The bearing surface 5 provides an air bearing surface for tape 1. The lower flange 6 extends beyond the edge of surface 5 and supports the lower edge of tape 1. The upper flange 7 is of spring steel and has a plurality of spring fingers 8. The outer fingers are longer than the inner fingers 8 so that the spring rate of the outer fingers is less than that of the inner fingers. In a preferred form the profile of the spring rate for the fingers is parabolic; however, other profiles such as an inverted-V or cosine shape could be used. The significant featu...