CN110774789A

CN110774789A - Low-temperature printing method of thermal printer

Info

Publication number: CN110774789A
Application number: CN201911182782.4A
Authority: CN
Inventors: 彭红; 王留欣; 石明浩
Original assignee: Aitiwell Electronic Technology (beijing) Co Ltd
Current assignee: Aitiwell Electronic Technology (beijing) Co Ltd; Vanstone Electronic Beijing Co Ltd
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-02-11

Abstract

The invention discloses a low-temperature printing method of a thermal printer, which comprises the steps that an upper computer processes printing data and obtains at least one line of dot matrix data, wherein each line of dot matrix data comprises at least N bits; reading the current temperature of a printing head of the printer and the current electric quantity percentage of the printer; judging whether the current temperature of a printing head of the printer is lower than a set temperature and the current electric quantity percentage of the printer is lower than the set electric quantity percentage, if so, equally dividing N bits into X groups of data bits to be printed, and sequentially heating and printing all the groups of data bits to be printed until all the data bits to be printed are heated and printed; if not, printing the dot matrix data of the whole line at one time; and the like. The advantages are that: the data bit group to be printed can be heated and printed under the low-temperature condition, the load current is reduced, the output voltage of the lithium battery under the low-temperature condition is prevented from having a very large voltage drop, the system power supply is ensured to be normal, and the conditions of abnormal power failure, sudden shutdown or restarting and the like are avoided.

Description

Low-temperature printing method of thermal printer

Technical Field

The invention relates to the technical field of thermal printer printing, in particular to a low-temperature printing method of a thermal printer.

Background

The thermal printer has the working principle that heating elements are arranged on a printing head according to a dot matrix, and the printing head can print required patterns after being heated and contacting thermal printing paper. Characters and patterns are generated by heating and generating chemical reactions on the thermal sensitive paper coated with chemical elements. This chemical reaction is carried out at a certain temperature. High temperatures accelerate this chemical reaction. When the temperature reaches a certain value, the chemical reaction can be completed within hundreds of microseconds. And when the heating is controlled, the stepping motor is controlled to feed paper, so that the printing of the pattern on the whole paper can be finished. The thermal printer thermal head has tiny heating elements arranged in a linear manner, such as fine-work LTP02-245, for a total of 384 heating dots. Then for the heating head. The minimum size of each heating spot is 0.125mm by 0.0625mm (width). The total width was 384 × 0.125mm to 48 mm.

In recent years, thermal printers are becoming more widely used with the spread of mobile payments. Thermal printers are used in many scenarios, such as supermarket cashiers, POS tickets, take-away tickets, express tickets, and the like. The thermal printer has low noise, stability and high printing speed; clear handwriting, no need of ink adding, convenient use and small volume. The system is well catered to various scenes such as mobile payment, outdoor printing, mobile equipment printing and the like.

When the thermal printer works, the printing head is required to be heated to a high temperature state instantly, the working voltage range is 4-9V, and the load current can reach 5-10A. Such a large load current is a huge impact for mobile devices powered by lithium batteries. Under the condition of normal temperature, the lithium battery has high activity and small internal resistance, and the impact current during printing has little influence on the system. However, the lithium battery activity is greatly influenced by temperature, the lithium battery activity is reduced and the internal resistance is increased in a low-temperature environment, so that the output voltage of the lithium battery generates a very large voltage drop due to impact current during printing, the system power supply is greatly influenced, and the system is abnormally powered off, suddenly shut down or restarted.

Disclosure of Invention

The invention aims to provide a low-temperature printing method of a thermal printer, so as to solve the problems in the prior art.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a low-temperature printing method of a thermal printer comprises the following steps,

s1, processing the print data by the upper computer, and obtaining at least one line of dot matrix data, wherein each line of dot matrix data comprises at least N bits;

s2, reading the current temperature of the printing head of the printer and the current electric quantity percentage of the printer;

s3, judging whether the current temperature of the printing head of the printer is lower than the set temperature and the current electric quantity percentage of the printer is lower than the set electric quantity percentage, if so, equally dividing the N bits in the step S1 into X groups of data bits to be printed, and sequentially heating and printing all the data bits to be printed until all the data bits to be printed are heated and printed; if not, printing the dot matrix data of the whole line at one time;

and S4, after each group of data bits to be printed of the dot matrix data in one row are completely heated and printed, heating and printing the dot matrix data in the next row until all the dot matrix data in each row in the printing data are completely heated and printed.

Preferably, the set temperature is-5 ℃.

Preferably, the set percentage charge is 50%.

Preferably, the upper computer is a mobile terminal which is independently powered by a battery.

Preferably, each heating point on the print head corresponds to each bit in the dot matrix data, the heating point corresponding to the high-order data in the bits needs to be heated, and the heating point corresponding to the low-order data in the bits does not need to be heated.

Preferably, a thermistor is arranged on a printing head of the printer, and the thermistor can detect the current temperature of the printing head.

The invention has the beneficial effects that: the printing method provided by the invention can realize heating printing of the data bits to be printed in groups under the low-temperature condition, reduce the load current, avoid very large voltage drop of the output voltage of the lithium battery under the low-temperature condition, ensure normal power supply of the system, and avoid the conditions of abnormal power failure, sudden shutdown or restart and the like.

Drawings

Fig. 1 is a schematic flow chart of a printing method in an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Example one

As shown in fig. 1, the present embodiment provides a low-temperature printing method for a thermal printer, the printing method including the steps of,

In this example, the set temperature was-5 ℃.

In this embodiment, the percentage of the set electric quantity is 50%.

In this embodiment, the upper computer is a mobile terminal powered by a battery alone.

In this embodiment, each heating point on the print head corresponds to each bit in the dot matrix data, the heating point corresponding to the higher data in the bits needs to be heated, and the heating point corresponding to the lower data in the bits does not need to be heated.

In this embodiment, a thermistor is disposed on a print head of the printer, and the thermistor can detect a current temperature of the print head.

Example two

In this embodiment, the upper computer processes the print data to obtain a line of dot matrix data, where the line of dot matrix data includes N bits, that is, the number of heating dots on the print head. Each heating point of the printing head corresponds to each bit of data one by one, the heating point corresponding to the high-order data '1' needs to be heated, and the heating point corresponding to the low-order data '0' does not need to be heated; then, reading the current temperature T of the printing head and the current percentage level SOC of the electric quantity of the equipment, and if the current temperature is lower than-5 ℃ and the SOC is lower than 50%, conceivably, if a line of dot matrix data in S1 is heated at the same time, the load current is very large; therefore, it is necessary to group the data of N bits (data bits to be printed) in groups of every N/8 high bits to form X groups of data bits to be printed.

In this embodiment, taking the fine LTP02-245 thermal printer as an example, when printing a whole line of solid lines, because all the heating points need to be heated, bit is 384 '1', the bit is divided into 8 groups of data bits to be printed, and each group has 48 data bits to be printed. It should be noted that, since it is impossible to precisely control whether each point is heated, other bits need to be supplemented with 0; that is, the data bits to be printed can be completely heated and printed by 8 groups. Thus, the data of one heating is divided into a plurality of heating, and the load current is greatly reduced.

In this embodiment, after the grouped heating is completed, the stepping motor is controlled to move by one step, and the dot matrix data of the next line is heated and printed, and so on.

By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained:

the invention provides a low-temperature printing method of a thermal printer, which can realize heating printing of data bits to be printed in groups under the low-temperature condition, reduce load current, avoid very large voltage drop of output voltage of a lithium battery under the low-temperature condition, ensure normal power supply of a system, and avoid abnormal power failure, sudden shutdown or restart and other conditions.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.

Claims

1. A low-temperature printing method of a thermal printer is characterized by comprising the following steps: the printing method comprises the following steps of,

2. The thermal printer cryogenic printing method of claim 1, wherein: the set temperature was-5 ℃.

3. The thermal printer cryogenic printing method of claim 1, wherein: the set percentage charge is 50%.

4. The thermal printer cryogenic printing method of claim 1, wherein: the upper computer is a mobile terminal which is independently powered by a battery.

5. The thermal printer cryogenic printing method of claim 2, wherein: each heating point on the printing head corresponds to each bit in the dot matrix data, the heating point corresponding to the high-order data in the bits needs to be heated, and the heating point corresponding to the low-order data in the bits does not need to be heated.

6. The thermal printer cryogenic printing method of claim 3, wherein: a thermistor is arranged on a printing head of the printer and can detect the current temperature of the printing head.