An OHP printing surface discriminating method and an apparatus therefor of an OHP and a sublimation type thermal printer having a printing surface discrimination region

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an OHP printing surface discriminating method and an apparatus therefor of an OHP and a sublimation type thermal printer having a printing surface discrimination area. The OHP printing surface detecting method of the sublimation type thermal printer includes a first process of feeding a printing sheet, a first process of feeding a printing sheet,; A second step of discriminating the type of the paper to be fed and performing a printing mechanism when the paper is a paper; A third step of performing an OHP printing surface discriminating mechanism when the fed printing paper is OHP; And a fourth step of performing a printing mechanism when the OHP is fed in the forward direction. Preferably, the OHP printing surface detecting device of the sublimation type thermal printer performs a printing mechanism when the printing paper is paper, A central processing unit for performing a surface discrimination mechanism; A stepping motor that feeds the printing paper under the control of the central processing unit; A print surface detecting sensor for detecting a print surface discriminating area of the OHP; A comparator for receiving an output of the print surface detecting sensor and outputting a digital signal; And a memory for storing print surface discrimination data output from the central processing unit. Accordingly, the present invention prevents the thermal print head from being damaged by automatically discharging the OHP when the OHP is fed in the reverse direction.