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Unsticking a Magnetic Tape from a Magnetic Head

IP.com Disclosure Number: IPCOM000076919D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Janssen, DM: AUTHOR [+3]

Abstract

In very low-speed single-capstan tape drives using tape cassettes, the force to move the tape in a backward direction is supplied by the tape reel itself. If the tape 10 remains stationary for a short time on the head 12, the tape can stick to the head 12. Capstan 14 is capable of unsticking the tape in the forward direction. However, during rewind, the strength of the pull by supply reel 16 may not be sufficient to pull the tape 10 free from the head 12.

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Unsticking a Magnetic Tape from a Magnetic Head

In very low-speed single-capstan tape drives using tape cassettes, the force to move the tape in a backward direction is supplied by the tape reel itself. If the tape 10 remains stationary for a short time on the head 12, the tape can stick to the head 12. Capstan 14 is capable of unsticking the tape in the forward direction. However, during rewind, the strength of the pull by supply reel 16 may not be sufficient to pull the tape 10 free from the head 12.

To unstick the tape 10 during rewind, capstan 14 is pulsed in the forward direction. This provides a longitudinal stress wave in the tape 10, first in tension and then in compression as the tape relaxes. During the compression portion of this cycle when tape tension is a minimum, the supply reel 16 is then activated in the rewind direction, and the tape 10 will break loose from the head 12.

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