B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
B41J 2/42 (2006.01) B41J 2/36 (2006.01)
Patent
CA 2080427
ABSTRACT A selection circuit for an electro-thermal printer with a resistance-type ribbon (10) incorporates a print unit (3), a current collection electrode (6), a memory (7), and a print control unit (5). A resistance-type inking ribbon (10) that is moved relatively transfers ink particles from the ink layer (9) into areas (101, 102, ...,) on the receiving medium when the associated thermal resistance in the resistance layer (100) is heated. The voltage drop Um that is caused by the total current Ig and by the variance of the resistances is measured through the non-selective current path (feedback layer (8)) in the resistance inking ribbon by means of a measurement electrode (29) that is arranged close to the print head, and this causes a constant voltage source (1) that has a reference voltage input to apply feed voltage Us = .alpha.Up + Ub to the electrodes (31, 32, 33, ...) that are temporarily connected with this through the switching unit (2). Figure 1.
Gunther Stephan
Thiel Wolfgang
Fetherstonhaugh & Co.
Francotyp-Postalia Gmbh
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