Magnetic tape cassettes

Details Magnetic tape cassettes Magnetic tape cassettes

1987-09-28

1989-04-11

Werner, David

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

242 76, 226196, G11B 1560, G11B 2304, B65H 2304

Patent

active

048198900

ABSTRACT:
A magnetic tape cassette has an improved reel spring, slack limiter and tape guide. The reel spring has a generally rectangular shape with first and second parallel edges extending substantially along its entire length. A flat, central base portion of the spring is bounded by a pair of transition portions which extend at an angle out of the plane of the base. A pair of outer end portions set at a sharper angle to the base complete the spring configuration. A polypropylene slack limiter applies a preloaded tension on the magnetic tape. The polypropylene eliminates the need for laminating a separate bearing material to the slack limiter. The tape guide has a semi-cylindrical, stainless steel insert attached to a plastic mounting core. The core is fastened to the cassette housing. Another form of tape guide has a corrugated surface to minimize contact with the tape.

REFERENCES:
patent: 3889900 (1975-06-01), Nelson
patent: 4228940 (1980-10-01), Umehara
patent: 4301488 (1981-11-01), Ramisch
patent: 4389010 (1983-06-01), Oishi et al.
patent: 4427166 (1984-01-01), Oishi et al.
patent: 4466582 (1984-08-01), Shiba
patent: 4491891 (1985-01-01), Shiba
patent: 4736904 (1988-04-01), Schoettle et al.
IBM Technical Disclosure Bulletin, Minimizing Magnetic Tape Surface Wear During Accessing in Loop System, R. C. Woodin, vol. 8, No. 1, Jun. 1965.

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