Browse Prior Art Database

Reversing Lead Screw Pressure Pump for Small Form Factor Tape Drives

IP.com Disclosure Number: IPCOM000121830D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 56K

Publishing Venue

IBM

Related People

DeLessio, A: AUTHOR [+3]

Abstract

Reel-to-reel tape drives can have an air compressor which is used to provide pressurized air to hydrostatic air bearings in the tape path. These hydrostatic air bearings levitate the tape on a thin layer of air in order to greatly reduce friction and wear in the tape path.

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This is the abbreviated version, containing approximately 77% of the total text.

Reversing Lead Screw Pressure Pump for Small Form Factor Tape Drives

      Reel-to-reel tape drives can have an air compressor which is
used to provide pressurized air to hydrostatic air bearings in the
tape path.  These hydrostatic air bearings levitate the tape on a
thin layer of air in order to greatly reduce friction and wear in the
tape path.

      When previously used, such air compressors were so bulky that
the design and size of the tape drive was affected.  The proposed air
compressor uses a reversing lead-screw to provide reciprocating
motion to a piston or a diaphragm.  This use of a reversing lead
screw reduces the size of the air compressor, which facilitates the
miniaturization of high density tape drives.

      A DC brushless motor would drive a piston or diaphragm via a
reversing lead screw (10).  Elimination of the troublesome piston arm
and piston bearing of a reciprocating compressor or vanes in rotary
compressor improves the mean time between failure (MTBF), noise,
vibration, and power consumption of the new air compressor.  This new
compressor is also smaller in size.

      The rotary motion would be provided by a DC brushless motor
(20).  This brushless motor could be servoed to provide a desired
pressure via adjusting its driving voltage.

      The reversing lead screw (10) has two helical paths on it.
These paths meet at a smooth transition at each end of the screw.
Thus, repetitive reciprocating motion is achieved.

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