Ink ribbon feed

Details Ink ribbon feed Ink ribbon feed

1991-12-30

1993-05-11

Burr, Edgar S.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

400208, B41J 3314

Patent

active

052095878

ABSTRACT:
A ribbon feed for a thermal ink transfer ribbon (14) is disclosed in which the ribbon is drawn from a supply spool (15) and, together with an article (17) such a mail item on which printing is to be effected, is fed past a thermal print head (12). A tachometer (45) is coupled to the feed to generate pulses as the item is fed. A sensor (33, 34) generates pulses as the spool (15) rotates due to drawing of the ribbon therefrom. The number of sensor pulses occurring in periods determined by the tachometer pulses is compared with a predetermined value to provide to enable detection of occurrence of a fault in the ribbon feed from the spool.

REFERENCES:
patent: 3998313 (1976-12-01), Hickey
patent: 4025830 (1977-05-01), Delaporte
patent: 4091913 (1978-05-01), Ku et al.
patent: 4705417 (1987-11-01), Harry
patent: 4813802 (1989-03-01), Gilham et al.
patent: 4821644 (1989-04-01), Gawler
W. M. Jenkins "End of Ribbon Sensor and Cartridge Present Indicator" IBM Technical Disclosure Bulletin vol. 27, No. 6 Nov. 1984.

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