Typewriting machines – Typing by other than type-face or type-die – Thermal
Patent
1987-07-29
1989-01-17
Wiecking, David A.
Typewriting machines
Typing by other than type-face or type-die
Thermal
346 76PH, B41J 320
Patent
active
047984830
ABSTRACT:
In an electrothermal printing apparatus, conventionally, the printing head is provided with a plurality of printing electrodes and a single common return path forming element (GND) to selectively and locally heat ink on the ink ribbon. To reduce power loss due to the presence of the common return element, the novel printing apparatus eliminates the common return element and comprises in turn a plurality of first switching transistors for each supplying printing current to the ribbon via each printing electrode when activated and a plurality of second switching transistors for each returning the printing current from the ribbon via each printing electrode when activated. To heat the ribbon, printing current is selectively supplied to the ink ribbon via at least one first switching element connected to a printing electrode and returned via at least one second switching element connected to another printing electrode.
REFERENCES:
patent: 3719261 (1973-03-01), Heinzer et al.
patent: 4350449 (1982-09-01), Countryman et al.
patent: 4484200 (1984-11-01), Tabata et al.
patent: 4616941 (1986-10-01), Nagai
patent: 4695847 (1987-09-01), Ishii et al.
patent: 4704616 (1987-11-01), Nakamura
Kabushiki Kaisha Toshiba
Wiecking David A.
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