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Fixed Orifice to Replace Combination Air Speed Control Muffler and Pneumatic Relief Valve

IP.com Disclosure Number: IPCOM000111785D
Original Publication Date: 1994-Mar-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Bahr, AA: AUTHOR [+3]

Abstract

Reel-to-reel and cartridge tape drives utilize an air compressor to provide pressurized air to hydrostatic air bearings in the tape path. The air bearings maintain a thin layer of air between the tape and the air bearing surface to reduce friction and wear in the tape path.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 72% of the total text.

Fixed Orifice to Replace Combination Air Speed Control Muffler and
Pneumatic Relief Valve

      Reel-to-reel and cartridge tape drives utilize an air
compressor to provide pressurized air to hydrostatic air bearings in
the tape path.  The air bearings maintain a thin layer of air between
the tape and the air bearing surface to reduce friction and wear in
the tape path.

      The 3480/90 tape drives are specified having a back-pressure
relief valve for use as an air-pressure control device.  The valve
maintains a constant pressure in the pneumatic system at any
altitude.  As the products become smaller and smaller, the
"limitations" on the size and number of pneumatic components have
increased to the point of making it necessary to seek new
alternatives.

      To achieve the physical-size product requirements, a
combination Air Speed Control Muffler (ASCM) has been proposed.
Although the ASCM is suitable for the current tape drives, it must
yield to the current development path for new products.  The
tolerance on air pressure allowed in the tape path has been opened
from 4.38.1 psig.  to 4.5.25 psig.  It is therefore no longer a
requirement for manufacturing or field engineering to adjust air
pressure.  This approach leads to the development of a fixed-orifice
device which is attached directly to the inlet side of the air filter
assembly on the vacuum side of the tape drive's pneumatic system.

      The fixed orifice is manufactured as a part of the...