Ink ribbon cassette for printer

Details Ink ribbon cassette for printer Ink ribbon cassette for printer

1982-07-28

1984-05-22

Pieprz, William

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

400208, 4001961, 4002024, B41J 3202, B41J 3508

Patent

active

044498381

ABSTRACT:
An ink ribbon cassette for impact type printers comprises an ink roller of plastic sponge impregnated with ink and an endless type ink ribbon contacting with the ink roller. The ink ribbon is provided with a proper tension by a leaf spring member. At the time of assembly, the pressure of the leaf spring on the ribbon is not yet impressed. After the setting of ribbon, the bow-shaped leaf spring is reversed to opposite side in a snap action, being pushed from the outside, thereby to impress the tension. In another example, when the ink volume impregnated in the ink ribbon decreases after long use of the cassette, pressure is applied to the ink roller by the spring member, by changing the side of it bow part and squeezing ink to transfer to the ink ribbon, thereby prolonging the service time of the ink ribbon.

REFERENCES:
patent: 2969865 (1961-01-01), Long
patent: 3356202 (1967-12-01), Goff, Jr.
patent: 4091914 (1978-05-01), Stipannk
patent: 4153378 (1979-05-01), Scherrer et al.
patent: 4273453 (1981-06-01), Haftmann
patent: 4300847 (1981-11-01), Hoffman
patent: 4307969 (1981-12-01), Daughters
Firth et al., "Web Retention Spring", IBM Technical Disclosure Bulletin, vol. 22, No. 6, p. 2386, 11/79.

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