Browse Prior Art Database

Positive Positioning of Cassette Tape Upon Loading

IP.com Disclosure Number: IPCOM000075829D
Original Publication Date: 1971-Nov-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Bender, RA: AUTHOR [+2]

Abstract

The mechanism uniquely determines the EOT (end-of-tape) position and BOT (beginning-of-tape) position, by utilizing three holes 10 in magnetic recording tape 12 at the BOT position and only two holes 14 at the EOT position.

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Positive Positioning of Cassette Tape Upon Loading

The mechanism uniquely determines the EOT (end-of-tape) position and BOT (beginning-of-tape) position, by utilizing three holes 10 in magnetic recording tape 12 at the BOT position and only two holes 14 at the EOT position.

Tape 12 is movably disposed in a cassette 16 and is moved during recording or reading in the forward direction F from a reel 18 to a reel 20, both located in cassette 16. Tape 12, when the cassette is in usable position, has a driven capstan 22 and an idler 24 on opposite sides of tape 12, and the tape is moved in the forward direction F by the capstan and idler which grip the tape between them. Photocells 26 and 28 are positioned on the inner side of tape 12, and a light source 30 is positioned on the other side of the tape. Photocell 28 is connected with a counter 32. When cassette 16 is in its usable position, photocell 28 is at the same level as holes 10 and 14 (located adjacent to edge 12a of tape 12), and photocell 26 is at a higher level to be in register with EWA (early warning area) holes 34 located in tape 12 adjacent the other edge 12b of the tape. The distance Z between a hole 10 and the actual beginning 12c of the tape is considerably less than the distance X between one of the EOT holes 14 and the actual end 12d of the tape. The distance Z may be two feet, for example, and the distance X may be six feet. Information on tape 12 may be written thereon or read therefrom by head 36....