Method and apparatus for detecting errors in an ink ribbon in a

Details Method and apparatus for detecting errors in an ink ribbon in a Method and apparatus for detecting errors in an ink ribbon in a

1983-08-26

1985-02-26

Goldberg, E. A.

Recorders

Thermal recording

400120, 4002403, 400249, 346106, B41J 320

Patent

active

045020574

ABSTRACT:
A method and apparatus for detecting an error such as a cutoff or the like of an ink ribbon used in a thermal transfer type multicolor printer, wherein the ink ribbon is provided with sets of ink zones containing heat dissolving inks, each set of the ink zones including ink zones, disposed in a predetermined order, of different colors. A timer is preset for providing an electric signal representative of detection of the error at an end of a predetermined timing interval equal to a time period necessary in an ink detection mode, in which one of the ink zones having a specified color is detected, for passing at least one ink zone through a printing position where a multicolor printing is made by means of a thermal head. The ink ribbon is then wound at a predetermined speed in the ink detection mode, and the timer is set at the winding of the ink ribbon. A sensor mark, which is provided to each of the ink zones for indicating its color, is detected to provide a color signal representative of the color indicated by the sensor mark. The timer is reset according to the color signal. The error detection signal is provided when the timer become operative because no color signal is supplied to the timer within the timing interval.

REFERENCES:
patent: 4091913 (1978-05-01), Ku et al.

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