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Dynamic Adjustment of the Helical Wrap Angle of Flexible Media in a Rotating Head Recorder

IP.com Disclosure Number: IPCOM000089006D
Original Publication Date: 1977-Sep-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Golz, WR: AUTHOR [+2]

Abstract

Fig. 1 shows a read/write unit for a rotary head helical tape drive. This unit includes a left side mandrel 10 and a right side mandrel 12 that are positioned so as to be in spaced alignment with each other. A rotating rotor which carries a rotating head/heads (not shown) is positioned between the mandrels. Each mandrel and the rotor carry a plurality of air holes which supply a thin film of air so that the media flies relative to the mandrel and/or rotating head. A plurality of guides 16, 18, 20 and 22 are seated off the mandrel and guide the tape as it makes its helical wrap about the read/write unit.

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Dynamic Adjustment of the Helical Wrap Angle of Flexible Media in a Rotating Head Recorder

Fig. 1 shows a read/write unit for a rotary head helical tape drive. This unit includes a left side mandrel 10 and a right side mandrel 12 that are positioned so as to be in spaced alignment with each other. A rotating rotor which carries a rotating head/heads (not shown) is positioned between the mandrels. Each mandrel and the rotor carry a plurality of air holes which supply a thin film of air so that the media flies relative to the mandrel and/or rotating head. A plurality of guides 16, 18, 20 and 22 are seated off the mandrel and guide the tape as it makes its helical wrap about the read/write unit.

Fig. 2 shows a section of the tape unwrapped from the supporting mandrel. The tape format includes a data track with a center line and leading and trailing sync marks positioned in servo zones 24 and 26, respectively. The sync marks are used for aligning the rotating head with a selected data track.

In order to change the angle of tape wrap so as to correct skew and/or head- tape misalignment, the air pressure on either the left mandrel or the right mandrel is dynamically adjusted and, as a result, the tape is moved for skew correction.

In order to vary the pressure in either the left side or right side of the mandrel, one or several passes of the read head are made across the tape, reading only the alignment information which is contained in the leading and trailing servo t...