Typewriting machines – Including interposed inking device for record-medium – Means auxiliary to ribbon mechanism
Patent
1991-06-04
1993-01-19
Burr, Edgar S.
Typewriting machines
Including interposed inking device for record-medium
Means auxiliary to ribbon mechanism
400703, B41J 3336
Patent
active
051802384
ABSTRACT:
In a dot impact printer, printing heads impact on an inked ribbon so as to form a pattern of dots on a paper sheet. The more often printing is carried out, the looser the central portion of the inked ribbon becomes. A sensor disposed perpendicularly against a surface of the inked ribbon detects such a condition of the inked ribbon, emitting a signal. Receiving the signal, a control means finds the inked ribbon unusable, interrupting the printing operation, and knowing a timing to replace the inked ribbon. The control means operates an alarm to urge replacement of the inked ribbon. Therefore, the dot impact printer is prevented from performing the printing operation under unfavorable conditions.
REFERENCES:
patent: 3905533 (1975-09-01), Corse
patent: 4834563 (1989-05-01), Ozawa et al.
patent: 4852480 (1989-08-01), Kunita et al.
patent: 5016182 (1991-05-01), Bergland et al.
Abe Kouzou
Hasegawa Kazumi
Hibino Hiromi
Kurihara Toshio
Nishida Koujiro
Burr Edgar S.
Citizen Watch Co. Ltd.
Nguyen Anthony H.
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