Typewriting machines – Including interposed inking device for record-medium – Ribbon-feeding mechanism
Patent
1990-03-18
1992-02-04
Burr, Edgar S.
Typewriting machines
Including interposed inking device for record-medium
Ribbon-feeding mechanism
400208, B41J 3352
Patent
active
050855310
ABSTRACT:
A cassette for a printing ribbon for typewriters comprises a casing accommodating a supply spool, a receiving spool and a brake and take up device which operates on a tube of the supply spool and on the ribbon which is unwound from the supply spool. The tube is rotatable on a sleeve projecting from the bottom of the casing. The brake and take up device comprises a shoe for applying a braking action to an internal surface of the tube. A wire spring has an intermediate portion which engages in a seat of coupling means of the shoe. In a first position the shoe is urged against the surface of the tube and brakes the supply spool. In a second position the shoe is spaced from the internal surface of the tube and the supply spool is free to rotate. The spring also performs the slack ribbon take-up function and for that purpose comprises an end having an L-shaped bent portion which in turn is engaged with the ribbon to regulate the tension and unwinding of the ribbon which is unwound from the supply spool.
REFERENCES:
patent: 4350454 (1982-09-01), Schoenlein
patent: 4401394 (1983-08-01), Hume et al.
patent: 4449837 (1984-05-01), Craft
patent: 4780011 (1988-10-01), Hasegawa
IBM Technical Disclosure Bulletin, vol. 24, No. 12 May 1982, "Straight Release Wire for Ribbon Cartridge".
Bennet Christopher A.
Burr Edgar S.
Ing. C. Olivetti & C. S.p.A.
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