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Magnetic Drum Recorder Assembly

IP.com Disclosure Number: IPCOM000098501D
Original Publication Date: 1960-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 114K

Publishing Venue

IBM

Related People

Poch, LJ: AUTHOR [+2]

Abstract

Magnetic head 10 fixed in a stationary cylinder 11 either reads or records data in a magnetizable surface of tape 12. The latter wraps substantially the entire peripheral surface of rotatable drum 13. Tape 12 is endless with the end loops secured relative to outer tape reels 14 and 15 by means of removable reel pins. Tape 12 is also wrapped about an inner tape reel 16. The tape path is from outer reel 14 to and around the central reel 16, through a slot (not shown) formed in drum shell 13A, around the peripheral surface of drum 13 to re-enter the slot and wrap around the other outer reel 15.

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Magnetic Drum Recorder Assembly

Magnetic head 10 fixed in a stationary cylinder 11 either reads or records data in a magnetizable surface of tape 12. The latter wraps substantially the entire peripheral surface of rotatable drum 13. Tape 12 is endless with the end loops secured relative to outer tape reels 14 and 15 by means of removable reel pins. Tape 12 is also wrapped about an inner tape reel 16. The tape path is from outer reel 14 to and around the central reel 16, through a slot (not shown) formed in drum shell 13A, around the peripheral surface of drum 13 to re-enter the slot and wrap around the other outer reel 15.

A new length of tape may be wrapped about the peripheral surface of drum
13. Permanently recorded index marks spaced one drum circumference apart are read by head 10 to signal when a new length of tape has been wrapped around the peripheral surface of drum 13.

The tape surface that is exposed to the magnetic head or heads can be moved bidirectionally. The drum is driven from a driving source, not shown, through pulley 17. An inner friction clutch located inside inner tape reel 16 is engaged by moving an inner non rotating cone 18 into a rotating outer cone 19. This action decelerates inner tape reel 16 relative to the rotating drum. Because of this, tape is then wound on inner tape reel 16 from outer tape reels 14 and 15. An outer friction clutch mounted to an inner gear 20 is engaged by moving an inner non rotating cone 21 into an outer rotati...