Thermal printing unit with dual thermal print heads

Abstract

The invention provides a thermal printing device with dual thermal printing heads. The device comprises thermal printing heads and a printer body which is matched with the thermal printing heads. The thermal printing heads are two opposite end face thermal printing heads whose heating resistors are opposite. The paper feed sides and the paper out sides of the thermal printing heads are provided with driven paper feed roller mechanisms and driving paper feed roller mechanisms. The end face thermal printing heads, the driven paper feed roller mechanisms and the driving paper feed roller mechanisms are arranged in the shell of the printer body. According to the thermal printing device, the two end face thermal printing heads are used to print multiple layers of thermal mediums, the energy load of the thermal printing heads can be reduced, the purpose of protecting the thermal printing heads is achieved, the service life of the thermal printing heads are prolonged, the colors of the multiple layers of thermal mediums are more uniform, and the thermal printing device has the advantages of high printing speed and low noise compared with a needle printer.

Description

technical field [0001] The invention relates to the field of thermal printing, in particular to a thermal printing device with double thermal printing heads. Background technique [0002] As we all know, the principle of a thermal printer is to cover a layer of heat-sensitive layer on the base material (usually paper), heat the heat-sensitive layer for a period of time, and change color due to chemical reaction to obtain an image. This chemical reaction is carried out at a certain temperature, and high temperature will accelerate this chemical reaction. When the temperature is lower than 60°C, it takes a long time, even decades, for the film to change color; when the temperature is 200°C, this reaction will be completed within tens of microseconds. The thermal printer selectively heats the heat-sensitive medium at certain positions, thus producing corresponding graphics. The heating is provided by a small electronic heating resistor on the print head that is in contact wit...

AI Technical Summary

Problems solved by technology

However, due to its technical limitations, dot matrix printers have many shortcomings compared with thermal printing: first, the resolution of dot matrix printers is low; second, the printing speed of dot matrix printers is slow; third, dot matrix printers are noisy; fourth, dot matrix printers low needle life

Images