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Magnetic Tape Unit With Precision Back Pressure Regulator

IP.com Disclosure Number: IPCOM000074944D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

McCully, ER: AUTHOR

Abstract

This magnetic tape unit includes a precision, bleed type, back pressure regulator 1 which provides a constant output pressure of 2 psi at output conduit 2. As the operating status of the magnetic tape unit changes, the air flow rate at this conduit changes from 2 CFM to 5 CFM.

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Magnetic Tape Unit With Precision Back Pressure Regulator

This magnetic tape unit includes a precision, bleed type, back pressure regulator 1 which provides a constant output pressure of 2 psi at output conduit
2. As the operating status of the magnetic tape unit changes, the air flow rate at this conduit changes from 2 CFM to 5 CFM.

Air under pressure is supplied by constant flow pump 3 having filters 4 and 5 connected to its input and output, respectively. As the flow requirements at conduit 2 change, the regulator variably bleeds a portion of the pump output to atmosphere.

Conduit 2 is connected to supply air under pressure to reel latch 6 and sensor 7 at all times that the pump is operative. Three- way valve 8 connects conduit 2 to tape threading mechanism 9 during loading of tape. At a later time, when tape is loaded, valve 8 connects conduit 2 to air bearings 10. During rewind of tape from the machine reel to the file reel, valve 11 connects conduit 2 to the tape guide retractors and to the rewind shoe which moves the tape away from the read/write head.

These various status of operation requires variable flow rate and constant pressure at conduit 2. Regulator 1 shown in View B achieves this function. Inlet 12 supplies air from the pump 3 to chamber 13 and to outlet 14. The quantity of air flowing to the outlet is controlled by controlling the vertical position of diaphragm 15. This diaphragm controls the quantity of air flowing through bleed port 16 to atmo...