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Browse Prior Art Database

Equalizing the Loading Characteristics of Vacuum Columns

IP.com Disclosure Number: IPCOM000076416D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Dobransky, RP: AUTHOR [+4]

Abstract

In a tape unit, uniform loading of both vacuum columns concurrently is achieved by equalizing the otherwise different loading characteristics, by the provision of at least one suitably adjusted bleed opening to the atmosphere or a matched bypass for air.

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Equalizing the Loading Characteristics of Vacuum Columns

In a tape unit, uniform loading of both vacuum columns concurrently is achieved by equalizing the otherwise different loading characteristics, by the provision of at least one suitably adjusted bleed opening to the atmosphere or a matched bypass for air.

This magnetic tape unit includes two vacuum column tape loop buffers 10, 11, with a machine reel and a removable file reel disposed to selectively supply tape to or receive tape from one of the columns, and a single capstan 12 located between the columns to control tape movement. A tape processing station 13 is mounted at a fixed position adjacent the upper portion of a narrow wall of the machine column. The lower portion of each column defines an operational zone 14, 15 and includes a capacitor-type loop position sensor, whose output signal servocontrols the reel motors in accordance with the position of the tape-loop bight within the zone. The upper portion of at least one of the columns includes an air flow leakage opening 16, 17 arranged to compensate for air leakage which occurs as the tape loop passes the processing station 13 during loading of the tape loops into the columns, this controlled air leakage producing concurrent loading of the columns.

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