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Method for Reducing Tape Tension Transients

IP.com Disclosure Number: IPCOM000042557D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Chow, WW: AUTHOR [+2]

Abstract

In a self-threading reel-to-reel tape transport in which a leader block is attached to one end of the tape it is necessary to ensure that the leader block is securely engaged in a take-up reel. One method of providing positive loading of the leader block is to slightly overdrive a gear drive for the leader block to thereby preload the gears. However, this preloading of the gears can create stress and tension transients in the tape when the tape is rewound and the leader block is to be removed from the take-up reel. These stress and tension transients can be eliminated by removing the preloading on the gears prior to removal of the leader block. The figure shows schematically a self-threading reel-to-reel tape drive in which a leader block 1 is driven onto a take-up reel 2 by means of a pantograph camming arrangement.

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Method for Reducing Tape Tension Transients

In a self-threading reel-to-reel tape transport in which a leader block is attached to one end of the tape it is necessary to ensure that the leader block is securely engaged in a take-up reel. One method of providing positive loading of the leader block is to slightly overdrive a gear drive for the leader block to thereby preload the gears. However, this preloading of the gears can create stress and tension transients in the tape when the tape is rewound and the leader block is to be removed from the take-up reel. These stress and tension transients can be eliminated by removing the preloading on the gears prior to removal of the leader block. The figure shows schematically a self-threading reel-to-reel tape drive in which a leader block 1 is driven onto a take-up reel 2 by means of a pantograph camming arrangement. When threading tape 3 onto take-up reel 2 the leader block 1 is preloaded onto reel 2 by motor 4 which drives the pantograph arm assembly 5. When rewinding tape 3 onto supply spool 6 in cartridge 7 it is necessary to ensure that the preloading of leader block 1 is removed prior to withdrawing block 1 from reel 2. When all but the last few wraps remain on the take-up reel 2, an unload operation for unloading block 1 from reel 2 is initiated. At the beginning of the unload operation driving motor 4 is driven in the clockwise direction for a short interval of time to remove the preloading on the gears. The con...