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Signal Amplitude Tape Tension Control

IP.com Disclosure Number: IPCOM000044940D
Original Publication Date: 1983-Jan-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Appetta, J: AUTHOR [+4]

Abstract

The amplitude of the read signals from a magnetic head can be used to control the tape tension applied to the tape in a reel to reel tape drive. The amplitude of the read signal is monitored and directed to a drive microprocessor to adjust the tension in the tape as a result of the amplitude. If the signal is too low, the tape tension is increased. If the amplitude is too high, the tape tension is decreased. The adjustment to the tape tension causes the tape to change flying height and thereby change the amplitude of the sensed signals from the tape.

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Signal Amplitude Tape Tension Control

The amplitude of the read signals from a magnetic head can be used to control the tape tension applied to the tape in a reel to reel tape drive. The amplitude of the read signal is monitored and directed to a drive microprocessor to adjust the tension in the tape as a result of the amplitude. If the signal is too low, the tape tension is increased. If the amplitude is too high, the tape tension is decreased. The adjustment to the tape tension causes the tape to change flying height and thereby change the amplitude of the sensed signals from the tape.

The main purpose of controlling the tape tension in a reel to reel tape drive is to control the head to tape interface. A steady tape tension will mean a steady tape flying height since tape tension is a variable in the hydrodynamic lubrication equation of the tape flying over the head. With the steady tape flying height, a consistency of head read signal amplitude will develop. Head amplitude, therefore, can be used to control the tape tension. The amplitude of all the tracks in a multi-track tape drive system could be averaged to eliminate the effects of spurious dropouts. The tension in the tape would be adjusted by adjusting the reel drives to provide a suitable read signal amplitude. This calibration factor is directed into the drive control.

The tape tension is held steady so long as the amplitude of the signals from the read head remain within a certain set tolerance. If t...