Browse Prior Art Database

Pneumatic Drum

IP.com Disclosure Number: IPCOM000097709D
Original Publication Date: 1961-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Auyang, RP: AUTHOR

Abstract

This device utilizes a perforated cylinder for transporting a short, magnetizable record strip past a magnetic read-write head.

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Pneumatic Drum

This device utilizes a perforated cylinder for transporting a short, magnetizable record strip past a magnetic read-write head.

A magnetic tape strip 1 is wrapped around a cylinder 2 with perforations 3 in its surface. Cylinder 2 is rotated around a central core 4 having air chambers 5, 6 and 7. A portion of the surface of 2 is not perforated but has instead two vacuum chambers 8 and 9. Chambers 8 and 9, or other mechanical devices, hold the tape ends to the cylinder. The cylinder is rotated to transport the tape past a magnetic read-write head 10 flanked on each side by air bearings 11 and
12.

During a read-write phase of cylinder rotation (left-hand drawing), air pressure, applied to chamber 5, blows the tape 1 away from the cylinder 2 into operative contact with the head 10. During this phase, chambers 6 and 7 are either open to the atmosphere or have a vacuum applied.

When the tape ends approach 10 (right-hand drawing), air pressure is removed from chamber 5 and applied to either chamber 6 or 7. This takes care of the slack tape which would otherwise pile up in front of bearing 11. When the tape ends pass the read-write head, air pressure is again switched from chamber 6 or 7 to chamber 5 to continue read-write operations.

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