Typewriting machines – Typing by other than type-face or type-die – Thermal
Patent
1993-06-25
1996-01-09
Burr, Edgar S.
Typewriting machines
Typing by other than type-face or type-die
Thermal
347199, B41J 235
Patent
active
054823862
ABSTRACT:
A selection circuit for an electro-thermal printer with a resistance-type ribbon includes a print unit, a current collection electrode, a memory, and a print control unit. The resistance-type inking ribbon that is moved relatively transfers ink particles from an ink layer into areas on a receiving medium when an associated thermal resistance in a resistance layer is heated. A voltage drop that is caused by a total current and by a variance of the resistances is measured through a non-selective current path (feedback layer) in the resistance inking ribbon by a measurement electrode that is disposed close to the print head. That causes a constant voltage source which has a reference voltage input to apply feed voltage to the electrodes that are temporarily connected therewith through a switching unit.
REFERENCES:
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patent: 4350449 (1982-09-01), Countryman et al.
patent: 4360819 (1982-11-01), Saito et al.
patent: 4404567 (1983-09-01), Katsuragi
patent: 4434356 (1984-02-01), Craig et al.
patent: 4575731 (1986-03-01), Horlander
patent: 4679053 (1987-07-01), Katsurai et al.
European Search Report.
Gunther Stephan
Thiel Wolfgang
Burr Edgar S.
Francotyp-Postalia GmbH
Greenberg Laurence A.
Kelley Steven S.
Lerner Herbert L.
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