Electrothermal printing apparatus

Details Electrothermal printing apparatus Electrothermal printing apparatus

1978-09-28

1980-12-02

Wright, Jr., Ernest T.

Typewriting machines

Typing by other than type-face or type-die

Thermal

346 76R, B41J 304

Patent

active

042368340

ABSTRACT:
Electrothermal printing apparatus includes a thin, planar, endless ribbon of electrically resistive material having a thin conductive layer on an outside surface thereof and a row of spaced-apart, conductive styli individually selectively coupleable to the conductive layer through a voltage source and disposed in contact with the ribbon at the inside surface thereof opposite the conductive layer. Momentarily coupling selected ones of the styli to the voltage source produces heating of discrete areas of the resistive ribbon adjacent the momentarily coupled styli. The ribbon which is mounted on one or more rollers moves relative to the styli and in the same direction and at the same speed as an adjacent length of thermally sensitive paper so that discrete areas of the ribbon heated by the styli remain in contact with the thermally sensitive paper long enough to color discrete areas of the paper adjacent the heated discrete areas of the resistive ribbon.

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IBM Technical Disclosure Bulletin, "Electrical and Mechanical Mechanism for Thermal Transfer Printing", Mitchell et al., vol. 18, No. 8, Jan. 1976.
IBM Technical Disclosure Bulletin, "Thermal Transfer Printer Employing Special Ribbons Heated with a Current Pulse", Mitchell et al., vol. 18, No. 8, Jan. 1976, p. 2695.
IBM Technical Disclosure Bulletin, "Resistive Ribbon Thermal Transfer Printing Method", Crooks et al., vol. 19, No. 11, Apr. 1977, p. 4396.

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