Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1982-09-16
1984-07-10
Christian, Leonard D.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
340568, 360134, G03B 104, G11B 1532, B60Q 100
Patent
active
044588577
ABSTRACT:
Magnetic tape reels, using file protect rings disposed within an annular channel concentric with the spindle opening within the tape reel, can be provided with a unique, access coding by defining a first plurality of recesses or projections on the bottom surface of the annular channel and a corresponding and mating second plurality of projections or recesses on the bottom and opposing surface of the file protect ring. The pattern of recesses, projections or both defined within the annular channel and on the bottom surface of the file protect ring uniquely associates each file protect ring with each tape reel such that a given ring will fit flushly with only one reel. A conventional electromechanical actuator senses whether or not the file protect ring is appropriately and flushly disposed within the channel, thereby preventing erasure or overwriting on the tape. Reading of the contents of a magnetic tape reel can also be prevented in the case where one or more projections are provided on the bottom surface of the annular channel and extend to the upper edges of the channel, thereby providing a physical obstruction to the actuator and preventing rotation of the reel.
REFERENCES:
patent: 3688057 (1972-08-01), Lee
patent: 3688300 (1972-08-01), Whysong et al.
patent: 4063292 (1977-12-01), Karsh
IBM Technical Disclosure Bulletin, vol. 8, No. 10, Mar. 1966, Visual Indicator for Tape Reel, p. 1427, G. L. Smith.
MacDonald Christopher N.
Moore Milton M.
Christian Leonard D.
Crow Vesta J.
Moore Mark G.
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