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Browse Prior Art Database

Parapet Air Bearing with Gravity Button Tape Guides

IP.com Disclosure Number: IPCOM000107351D
Original Publication Date: 1992-Feb-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 3 page(s) / 94K

Publishing Venue

IBM

Related People

DeLessio, A: AUTHOR [+2]

Abstract

In a tape drive, guiding of the flexible web of magnetic tape must be done in a repeatable manner so that written data may be later read back. Fig. 1 shows two compliant tape guides 10 being used to guide magnetic tape 20 across a magnetic transducer 30. Each compliant tape guide consists of a hydrostatic air bearing 11, reference lower flange 12, and a compliant member 13. The compliant member exerts a load on one edge of the magnetic tape so that the other edge is seated against the reference lower flange. The hydrostatic air bearing facilitates this seating by virtually eliminating any friction across the width of the tape.

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Parapet Air Bearing with Gravity Button Tape Guides

       In a tape drive, guiding of the flexible web of magnetic
tape must be done in a repeatable manner so that written data may be
later read back.  Fig. 1 shows two compliant tape guides 10 being
used to guide magnetic tape 20 across a magnetic transducer 30.  Each
compliant tape guide consists of a hydrostatic air bearing 11,
reference lower flange 12, and a compliant member 13.  The compliant
member exerts a load on one edge of the magnetic tape so that the
other edge is seated against the reference lower flange.  The
hydrostatic air bearing facilitates this seating by virtually
eliminating any friction across the width of the tape.

      Historically, the compliant member was provided access to one
edge of the tape by undercutting the width of the hydrostatic air
bearing, across its entire arc, by approximately 0.1 to 0.15 mm.
This is shown in Fig. 2.  In the past, this presented no difficulty,
as the substrate of the tape was thick and it was often backcoated.
Even though some magnetic tape stuck up above the hydrostatic air
bearing, the thickness of the tape and the radius of the hydrostatic
air bearing was sufficient to prevent buckling of the unsupported
edge of tape.

      However, the trend has been to remove the backcoating on
magnetic tape and to use a thinner substrate.  These actions allow
more magnetic tape to be stored in a given reel or cassette, thus
increasing data capacity.  This...