Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1985-08-23
1987-06-30
Petrakes, John
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
242198, 242200, 360 961, 360 965, G11B 23087, G11B 2304, G11B 2308
Patent
active
046764534
ABSTRACT:
A magnetic tape cassette of a type particularly useful for high density digital audio recording wherein the tape is positively protected from dust and other contamination. The cassette includes a pair of hubs on which the magnetic tape is wound, and a locking member for locking the hubs. An opening is provided through which the tape can be extracted for playing. A swingable guard panel is provided which closes the front part of the opening when the cassette is not in use, and a slidable slide guard closes the lower part of the opening. The locking member has locking parts engaged with annular parts formed on the hubs to prevent rotation of the hubs, the locking member being slidable in a direction forwardly and backwardly of the cassette. The slide guard is in the form of a plate slidable on the outer surface of the bottom of the cassette forwardly and backwardly. A compound spring is provided which has a fulcrum part locked to a boss formed in the cassette case and two arms extending from the fulcrum part. One of the two arms urges the locking member toward the rear end of the cassette, while the other arm urges the slide guide towards the front end of the cassette.
REFERENCES:
patent: 4214719 (1980-07-01), Kato
patent: 4225100 (1980-09-01), Sugawara
patent: 4496119 (1985-01-01), Sieben
patent: 4576345 (1986-03-01), Koken et al.
Komiyama Choji
Oishi Kengo
Fuji Photo Film Co. , Ltd.
Petrakes John
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