Browse Prior Art Database

Tape Cleaner for Facilitating Error Correction

IP.com Disclosure Number: IPCOM000080256D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Mallette, TE: AUTHOR

Abstract

This tape cleaner provides two straight cleaning blades which scrape the oxide surface of magnetic recording tape, prior to the tape encountering the read/write head of a magnetic tape unit. The cleaner blades are canted to the tape path. In the event that a line of foreign material is released from a blade, this line passes over the head's multitrack read gaps at an angle. Since data bytes are written on tape normal to the tape path, the errors produced by this undesirable line of foreign material produce a minimum quantity of bit errors in each byte crossed by the line, such that these errors can be corrected by associated error correcting circuits.

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Tape Cleaner for Facilitating Error Correction

This tape cleaner provides two straight cleaning blades which scrape the oxide surface of magnetic recording tape, prior to the tape encountering the read/write head of a magnetic tape unit. The cleaner blades are canted to the tape path. In the event that a line of foreign material is released from a blade, this line passes over the head's multitrack read gaps at an angle. Since data bytes are written on tape normal to the tape path, the errors produced by this undesirable line of foreign material produce a minimum quantity of bit errors in each byte crossed by the line, such that these errors can be corrected by associated error correcting circuits.

With reference to Fig. 1, metal reference plate 10 supports head 11 and tape cleaner 12. As tape 13 moves in a forward direction, from right to left, its oxide surface first encounters cleaner 12, then the head's multitrack write gap 14, followed by multitrack read gap 15.

As best seen in Fig. 1, cleaner 12 includes two blades 16 and 17 which are inclined to the direction of tape movement represented by arrow 18. Adjacent each of the blades is a cavity 19, Fig. 2, into which foreign material falls and is carried away by airflow induced by a vacuum source, not shown. The central portion 20 of the cleaner is open to atmosphere. The vacuum force within cavities 19 causes the tape to bow down into portion 20, as shown at 21, and causes air to flow from portion 20 to each oi...