Mechanism for detecting end of ink ribbon in a ribbon cassette

Details Mechanism for detecting end of ink ribbon in a ribbon cassette Mechanism for detecting end of ink ribbon in a ribbon cassette

1986-05-02

1988-12-27

Wright, Jr., Ernest T.

Typewriting machines

Including interposed inking device for record-medium

Means auxiliary to ribbon mechanism

400208, 4002193, 400234, 4007051, 242 57, B41J 3536

Patent

active

047937238

ABSTRACT:
The approaching end of usable ink ribbon which is being supplied from a cassette to a serial printer is signaled when a detector member which rides on used ink ribbon as it is wound onto the take-up spool of the cassette, reaches a predetermined distance away from the axis of the take-up spool and moves to project through an opening in the cassette. The wall of the cassette serves as a barrier to motion of the detecting member, with the opening in the wall establishing the predetermined diameter of the used ink ribbon. A detector on the frame of the printer responds to the presence of the detector member when it projects from the cassette.

REFERENCES:
patent: 2843688 (1958-07-01), Masem
patent: 3519213 (1970-07-01), Hofmann et al.
patent: 3632052 (1972-01-01), Read
patent: 3642225 (1972-02-01), Kakichi et al.
patent: 4000804 (1977-01-01), Zaltieri
patent: 4115013 (1978-09-01), Hedstrom
patent: 4213575 (1980-07-01), Firth, III et al.
patent: 4407593 (1983-10-01), Haftmann
IBM Technical Disclosure Bulletin, "End-of-Ribbon Detector," Helinski, vol. 20, No. 6, Nov. 1977, pp. 2173-2174.
IBM Technical Disclosure Bulletin, "Limit Switch for Printer Carrier", Habich et al, vol. 23, No. 7B, Dec. 1980, pp. 3085-3086.

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