Browse Prior Art Database

Magnetic Tape Cartridge

IP.com Disclosure Number: IPCOM000075977D
Original Publication Date: 1971-Dec-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 68K

Publishing Venue

IBM

Related People

Stahlberg, EG: AUTHOR [+3]

Abstract

The magnetic tape cartridge shown in the Figure comprises a top shell 1 and a bottom shell 2, assembled together by fasteners such as 3, 4.

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Magnetic Tape Cartridge

The magnetic tape cartridge shown in the Figure comprises a top shell 1 and a bottom shell 2, assembled together by fasteners such as 3, 4.

Internal walls of registration holes 5 and 6 in the top shell mate with registration pins in the utilization device, to align the complete cartridge when it is placed in the device. The external walls of these holes 5 and 6 mate with internal walls of rectangular and square cross-sectioned receptacles 7 and 8 in bottom shell 2.

The insertion of round walls in straight sided receptacles gives accurate registration, without requiring as precise manufacturing tolerances as would be needed for mated cylindrical surfaces. The walls of registration hole 6 and receptacle 8 are provided with aligned sensing holes 9, and 10, 11, respectively. A light source inserted in hole 6, when the cartridge is placed on the registration pin of the utilization device, transmits a light beam through those sensing holes when a transparent or punched portion of magnetic tape passes between wall 12 of receptacle 8 and wall 13 of bottom shell 2. In this way, the approach of the end of the tape or of the beginning thereof can be easily recognized, provided that the corresponding tape portions bear appropriate punched holes or transparent areas.

Keyhole shaped cylinder 14 in bottom shell 2 mating with registration hole 5 in top shell 1, is provided for file protection. File protection shaft 15 includes a tooth 16, which slides in...