Browse Prior Art Database

Damping Longitudinal Tape Vibration With a Roller

IP.com Disclosure Number: IPCOM000078330D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Hennings, R: AUTHOR [+2]

Abstract

Longitudinal vibration induced in the tape by the vacuum column of this magnetic tape unit is eliminated by a contact roller, which is driven by the tape before the tape reaches the read/write head. This tape unit moves tape at a relatively low speed of perhaps 12.5 inches per second. The tape experiences relatively low acceleration and deceleration during a start/stop cycle.

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Damping Longitudinal Tape Vibration With a Roller

Longitudinal vibration induced in the tape by the vacuum column of this magnetic tape unit is eliminated by a contact roller, which is driven by the tape before the tape reaches the read/write head. This tape unit moves tape at a relatively low speed of perhaps 12.5 inches per second. The tape experiences relatively low acceleration and deceleration during a start/stop cycle.

As one-half inch wide magnetic tape 1 moves in a forward direction, from file reel 2 to machine reel 3, it travels through vacuum columns 4 and 5. Capstan 6 is located between the columns. Rollers 7 and 8 guide the tape as it enters and leaves the column areas.

Magnetic read/write head 9 is located in a side wall of column 4. When tape moves in a forward direction, the tape moves out of loop 10, across head 9 and over capstan 6. Column 4 includes two side-edge guides 11 and 12 to eliminate transverse movement of the tape relative to the head.

The flow of air around loop 10, into the vacuum plenum at the bottom of column 4, sets up longitudinal vibration in the section of tape advancing toward head 9. This vibration is eliminated by free-running, cylindrical roller 13, located adjacent head 9. This roller is mounted in low-drag bearings.

As an alternative, roller 13 may be placed at the location of side-edge guides 11, and disposed between the edge guides to be driven by the tape as it moves between these guides.

Static friction between the ta...