A thermal ticket printer to prevent local overheating

Abstract

The invention provides a heat-sensitive ticket printer preventing local overheating. According to the ticket printer, a forward paper feeding direction and a reverse paper feeding direction are provided, and the positions of common heating elements in a printing head are judged according to heating records; next, under the condition of possible local overheating, the bitmap of a ticket to be printed currently is analyzed so as to determine the time sequence distribution of print points when the ticket is printed in the forward paper feeding direction and the reverse paper feeding direction; and then, the heating time intervals of the common heating elements in the forward paper feeding direction and the reverse paper feeding direction are respectively determined through matching operation, the paper feeding direction in which the heating time interval can be delayed is selected from the two paper feeding directions, and a corresponding time sequence scheme is selected.

Description

technical field [0001] The present invention relates to printing equipment, and more particularly, to a heat-sensitive ticket printer that prevents local overheating. Background technique [0002] The principle of thermal printing is to heat the thermal printing paper to make it color under the premise that the heating temperature and heating position are controllable. Wherein, the heat-sensitive printing paper includes a base layer and a heat-sensitive chromogenic layer. The base layer basically belongs to ordinary paper, and a heat-sensitive chromogenic layer is coated on the base layer. There is a color developer and a leuco dye in the heat-sensitive color-forming layer. At room temperature, the chemical reaction between the color developer and the leuco dye is extremely slow, and it may take years to turn the thermal printing paper black; however, When heated above a certain temperature (generally between 70°C and 200°C), the reaction speed between the color developer a...

AI Technical Summary

Problems solved by technology

[0011] For the problem of local overheating, although the heat output based on the heating record can be relatively accurately controlled for each printing, with the increase of the printing volume, the commonly used heating elements will inevitably fail to dissipate heat in time due to the accumulation of heat. tendency to overheat

In order to ensure the printing quality and prevent the damage of the heating element, the printing has to be interrupted for a certain period of time at this time, which reduces the speed of issuing tickets accordingly, and with long-term use, the common heating element still has a high risk of damage

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