Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1986-05-19
1987-10-27
Levy, Stuart S.
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
242199, G11B 1532, G11B 2304
Patent
active
047024348
ABSTRACT:
A tape cassette arrangement comprises a supply reel and a take up reel and control means acting upon the take up reel to prevent unauthorized rewinding of the tape. The control means comprises a pawl which engages the take up reel in the tape unwinding direction and a slidable mechanism which releases the pawl from the toothed periphery of the reel. To permit authorized rewinding of the cassette, the ratchet may be dissengaged by moving the controlling mechanism with a tool inserted into an aperture in the cassette housing. To prevent a knowledgable user from inserting a tool into the aperture and playing, rewinding and playing, the cassette over and over again, a second pawl is mounted to engage the supply reel stopping its rotations in the tape playing direction. The second pawl is engaged when a rewinding tool is inserted into an aperture in the cassette housing. A counter is connected to the control mechanism to record the number of times the tape is played.
REFERENCES:
patent: 3771745 (1973-11-01), Yamada
patent: 3995319 (1976-11-01), Harris
patent: 4274605 (1981-06-01), Gruber, Jr.
patent: 4466584 (1984-08-01), Chevalier
patent: 4482104 (1984-11-01), Saito
patent: 4513929 (1985-04-01), Aishi
patent: 4553717 (1985-11-01), Takagi
patent: 4575778 (1986-03-01), Vogelsang
patent: 4586101 (1986-04-01), Vogelsang
patent: 4604671 (1986-08-01), Oishi
patent: 4607307 (1986-08-01), Sieben
Joel Richard A.
Levy Stuart S.
Matecki Katherine
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