CN114312036A - Method for controlling history of heating data of thermal head, storage medium, and printer - Google Patents
Method for controlling history of heating data of thermal head, storage medium, and printer Download PDFInfo
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- CN114312036A CN114312036A CN202111598121.7A CN202111598121A CN114312036A CN 114312036 A CN114312036 A CN 114312036A CN 202111598121 A CN202111598121 A CN 202111598121A CN 114312036 A CN114312036 A CN 114312036A
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Abstract
The invention discloses a heating data record control method of a thermal printing head, a storage medium and a printer, relating to the technical field of printing, wherein a line printing cycle is divided into at least two time periods, and a heating point is added for time period control: at least one time period exists, and whether the heating point is heated or not is determined according to the original data; and there is at least one other time period for determining whether to heat the heated dot based on whether the heated dot has been heated in at least one preceding line of print cycles. Therefore, the line printing cycle is controlled in different time periods, the heating time of the heating points in the current line printing cycle is determined and adjusted according to the previous working condition of at least one current line of the printing cycle, the temperature of the heating points is controlled, the printing result deviation caused by residual heat or overhigh temperature due to continuous heating of the heating points is avoided, and the printing quality is improved. It does not need to stop rest in the middle of printing, and can not reduce printing speed.
Description
Technical Field
The invention relates to the technical field of printing, in particular to a heating data record control method of a thermal printing head, a storage medium and a printer.
Background
The basic principle of thermal printing is that thermal paper is heated from normal temperature to color development temperature (100 ℃ to 130 ℃) by heating points (usually, one heating point corresponds to one heating resistor) of a printing head, so that the heating points corresponding to printing paper are changed from white to black, and a display effect is achieved, for example, common supermarket shopping bills. However, if the temperature of the printing paper is further increased, the printing paper may have a white inversion phenomenon, and the temperature of the thermal printhead is too high, which may affect the lifespan of the printhead. The prior low-end thermal printer has the following problems in the use process: when the printing paper is continuously printed in the same column, the excessive high color development temperature is easy to occur, so that the residual heat of printing is caused, the white dots of the printing paper are blackened, and the displayed content of the bill is inconsistent with the expected content.
The example is a thermal printer on a supermarket receipt POS machine. The width of the printing paper is 58mm, the width of a heating head of the thermal printer is 48mm, one row corresponds to 384 points, each point corresponds to one heating point, and the corresponding position of the thermal paper is subjected to point heating. Each heating point is controlled by 384bit wide signals of software whether to heat or not (the heating is carried out when the corresponding digit is 1 at the high position, and the heating is stopped when the corresponding digit is 0 at the low position). In the prior art, before each line is printed by a thermal printer, the printing content is converted into a 384bit wide signal, then a heating main switch STB is pulled up to carry out heating for one time, and the STB is closed after the heating is finished. And repeating the steps for printing line by line until the whole ticket is finished. In the prior art, each line is printed independently, whether the previous line is printed or not is not considered, in this case, if the first lines of a certain column are printed all the time, the heating points corresponding to the column are always in a heating state, no time is available for heat dissipation, the temperature is continuously increased, heat residue occurs, and when the unheated points are printed subsequently, the residual waste heat can generate a heating effect, so that the white points of the bill are changed into black, which is inconsistent with the expectation. If the temperature of the heating point is further increased when a longer vertical line is printed, the printed point is firstly blackened and then the phenomenon of whitening can occur under the action of high temperature, the heating point can be seriously damaged even, and the rated service life of the thermal printer can not be reached.
In view of the above problems, a common optimization scheme at present is to increase some rest time after each line is printed, so as to reduce the temperature of the heating point, and then print the next line. Since cooling takes time and is relatively slow, this solution causes a considerable increase in the time required to print one and the same ticket, i.e. the printing speed becomes slow and the customer experience is poor.
Disclosure of Invention
The invention provides a heating data history control method of a thermal printing head, a storage medium and a printer, aiming at solving the problems in the prior art.
The invention adopts the following technical scheme:
a heating data resume control method of a thermal print head acquires original data of heating points, wherein the original data is data which is generated by a printer according to printing content in a line printing period and is used for controlling whether the heating points are heated or not; the method also comprises the following steps of dividing the line printing period into at least two time periods, and controlling the heating point in the time period:
if the heating point does not need to be heated in the current line printing period according to the original data, the heating point is not heated in the whole time period;
if the heating point needs to be heated in the current line printing period according to the original data, at least one time period exists for heating the heating point; and there is at least one other time period for determining whether to heat the heated dot based on whether the heated dot has been heated in at least one preceding line of print cycles.
Further, the determining whether to heat the heating point according to whether the heating point has heating in at least one previous line of printing period includes:
heating the heating point only when the heating point needs to be heated in the current line printing period according to the original data and the heating point is not heated in the previous two continuous line printing periods;
or only heating the heating point when the heating point needs to be heated in the current line printing period according to the original data and the heating point is heated in the previous two continuous line printing periods.
Further, the number of the another time segments is at least two, and the time segments are not consecutive to each other on the time axis.
Further, dividing the line printing cycle into four continuous time periods, namely a time period A, a time period B, a time period C and a time period D in sequence;
if the heating point does not need to be heated in the current line printing period according to the original data, the heating point is not heated in the time period A, the time period B, the time period C and the time period D;
if the heating point needs to be heated in the current line printing period according to the original data, (1) heating the heating point in a time period A and a time period C; (1) heating the heating dot in a time period B only when the heating dot is not heated in the previous two consecutive line printing cycles; (3) the heating dot is heated in the time period C only when the heating dot is heated in the preceding two consecutive line printing cycles.
Further, the time periods A, B, C and D are the same;
a storage medium having stored thereon a computer program which, when executed, implements a thermal print head heating data history control method as recited in any one of the above.
A printer, characterized by: including a storage medium as described above.
From the above description of the structure of the present invention, it can be seen that the present invention has the following advantages:
firstly, in the invention, a line printing cycle is divided into at least two time periods, and heating points are added for time period control: at least one time period exists, and whether the heating point is heated or not is determined according to the original data; and there is at least one other time period for determining whether to heat the heated dot based on whether the heated dot has been heated in at least one preceding line of print cycles. Therefore, the invention adopts time-interval control, adjusts the heating time of the heating points in the printing period of the current line according to the prior working condition of the printing period of at least one current line, and controls the temperature of the heating pointsThe degree avoids producing heat because of the heating point is continuous to generate heat and remains or the high temperature leads to the printing result to appear the deviation, promotes printing quality, has avoided making the impaired condition of thermal print head because of the heating point high temperature well simultaneously. And the rest is not needed to be stopped in the middle of printing, and the printing speed is not reduced. Taking the 'lu' word as an example, the 'lu' word printed by the prior art is expressed as
The whole Chinese characters are pasted into a cluster due to the influence of residual heat, and the white gap between the longest transverse line in the middle and the transverse lines in the upper row and the lower row is almost invisible. The character 'lu' printed by the invention is expressed as
The blank between the transverse lines is clear and obvious, and the whole body is clearer.
Secondly, in the present invention, the number of the another time periods is at least two, and the time periods are not consecutive to each other on the time axis. Therefore, the time period of singly considering the original data of the current line printing period and the time period of considering the original data of the multiple line printing period are arranged at intervals, and the time periods for heating the heating points can be dispersedly arranged on the whole current line printing period, so that the temperature fluctuation range of the heating points in the line printing period is smaller, the temperature is more stable, and the printing quality is further improved.
Drawings
FIG. 1 is a truth table comparing raw data to sub-data for a heating spot in one embodiment of the present invention.
Fig. 2 is a block flow diagram of another embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
Example one
As shown in FIG. 1, the present invention can be expressed as
A method for controlling heating data history of a thermal print head, comprising the steps of:
firstly, acquiring raw data of heating points, wherein the raw data is computer-readable data which is generated by a printer according to printing contents in a line printing period and is used for controlling whether the heating points are heated or not.
Equally dividing each line printing period into four continuous time periods, and successively performing four time period control on the heating points in one line printing period, wherein the method specifically comprises the following steps:
each line printing period is equally divided into four continuous time periods, namely a time period A, a time period B, a time period C and a time period D which are sequentially connected, four subdata for controlling the heating points are formed, the four subdata sequentially control the heating head according to the sequence, the printer updates subdata once when each time period starts, and replaces the subdata with the subdata next, so that the heating points are controlled in a time-sharing mode in one line printing period.
Specifically, (1) whenever the heating dot needs to be heated in the current line printing cycle according to the original data, the sub data corresponding to the time period a and the time period C are the same as the original data in the current line printing cycle. That is, in the original data in the current line printing cycle, if the value of the byte digit of the heating point is 1, the subdata corresponding to the time period a and the time period C is 1; and if the byte digit of the heating point is 0, the subdata corresponding to the time period A and the time period C is 0.
(2) If the heating point does not need to be heated in the current line printing cycle according to the original data, the subdata corresponding to the time period B and the time period D are the same as the original data in the current line printing cycle. That is to say, in the original data of the current line printing cycle, the byte number of the heating point is 0, and the subdata corresponding to the time period B and the time period D are both 0, and the heating point is not heated.
(3) If the heating point needs to be heated in the current line printing period according to the original data, only when the heating point is not heated in the previous two continuous line printing periods, heating the heating point in the time period B; the heating dot is heated in the time period C only when the heating dot is heated in the preceding two consecutive line printing cycles.
N heating resistors are arranged in a row of the printing head, each heating resistor forms a heating point, and the heating printing is carried out on the points at the corresponding position of the thermal sensitive paper. The printer generates Nbit binary data (i.e. original data) according to the printing content, each byte bit corresponds to a heating point, and the heating point is generally heated by high-order data 1 and low-order data 0. Fig. 1 shows all possible situations of a heating point in three consecutive line printing cycles (i.e., the last two lines, the last line, and the current line), and lists the corresponding sub-data of the heating point in each case in the period a (i.e., the current line a), the period B (i.e., the current line B), the period C (i.e., the current line C), and the period D (i.e., the current line C) of the current line printing cycle according to a heating data history control method of a thermal print head disclosed in the first embodiment.
As can be seen from fig. 1, the heating time length of the heating point is adjusted according to the heating data history control method of the thermal print head disclosed in the first embodiment, which has four specific cases as follows:
the first condition is as follows: heating is needed in the current line printing period, when the heating is out of date in the previous two line printing periods, the heating point is heated only in the time period A and the time period C of the current printing period, and the heating time length accounts for 50% of the line printing period;
case two: heating is needed in the current line printing period, and when one of the two previous line printing periods is heated, the heating point is heated only in the time period A, the time period B and the time period C of the current printing period, and the heating time length accounts for 50% of the line printing period;
case three: heating is needed in the current line printing period, when the previous two line printing periods are not heated, the heating point is heated only in the time period A, the time period B, the time period C and the time period D of the current printing period, and the heating time length accounts for 100% of the line printing period;
case four: heating is not needed in the current line printing period, and the heating point is only not heated in the time period A, the time period B, the time period C and the time period D of the current printing period.
Example two
As shown in FIG. 2, the present invention can also be expressed as
A method for controlling heating data history of a thermal print head, comprising the steps of:
firstly, printing is started;
and secondly, acquiring original data including the heating points including the printing period of the current line, the printing period of the previous line and the printing period of the two lines from a cache of the printer.
Equally dividing each line printing cycle into four continuous time periods, namely a time period A, a time period B, a time period C and a time period D; after confirming the time period of the current line printing cycle, processing the time periods respectively according to the following modes:
(1) in the time period A, directly sending the original data of the printing period of the current line to a printer and controlling the heating point;
(2) in the time period B, performing and operation on the original data in the last two rows of printing cycles, performing and operation on the obtained result and the original data in the current row of printing cycles, sending the obtained result to the printer, and controlling the heating point;
(3) in the time period C, original data of the printing period of the current line is sent to the printer, and the heating point is controlled;
(4) in the time period D, performing OR operation on the original data in the last two rows of printing cycles, performing OR operation on the obtained result and the original data in the current row of printing cycles, sending the obtained result to the printer, and controlling the heating point;
the low end cpu performs poorly, requiring the computation and transmission of data to be completed before each small heating period begins. Taking a row of 384 heating points as an example, the above processing method can be quickly implemented by using the following software rules:
a. recording data of 384 points in two lines as 48 bytes, and using char last _ two _ line [ i ] to represent original data of the ith heating point in the last two lines of printing period (i is an integer and the value range is 0 to 47);
b. recording the data of 384 dots on the previous line as 48 bytes, and using char last _ one _ line [ i ] to represent the original data of the ith heating dot in the previous line printing period;
c. recording the data of 384 points of the current line as 48 bytes, and using charr current _ line [ i ] to represent the original data of the ith heating point in the printing period of the current line.
d. When the sub-data of the ith heating point in the four time periods in the current line printing period are respectively represented by charline _ send _ A [ i ], charline _ send _ B [ i ], charline _ send _ C [ i ] and charline _ send _ D [ i ];
e、line_send_A[i]＝current_line[i]；
f、line_send_B[i]＝current_line[i]&(～(last_two_line[i]&last_one_line[i]))；
g、line_send_C[i]＝current_line[i]；
h、line_send_D[i]＝current_line[i]&(～(last_two_line[i]|last_one_line[i]))。
and fourthly, judging whether the time period D of the current line printing period is finished or not, and if not, returning to the third step.
And fifthly, judging whether printing is finished or not, and if not, returning to the step two.
And sixthly, finishing printing.
EXAMPLE III
A heating data history control method for a thermal print head includes the following steps:
acquiring original data of heating points, wherein the original data is data which is generated by a printer according to printing contents in a line printing period and is used for controlling whether the heating points are heated or not; the method also comprises the following steps of dividing the line printing period into at least two time periods, and controlling the heating point in the time period:
if the heating point does not need to be heated in the current line printing period according to the original data, the heating point is not heated in the whole time period; if the heating point needs to be heated in the current line printing period according to the original data, at least one time period exists for heating the heating point; and there is at least one other time period for determining whether to heat the heated dot based on whether the heated dot has been heated in at least one preceding line of print cycles.
In the above-mentioned item (ii), the determination of whether to heat the heating dot according to whether the heating dot is heated in at least one previous line of the printing cycle may be as follows: heating the heating point only when the heating point needs to be heated in the current line printing period according to the original data and the heating point is not heated in the previous two continuous line printing periods; or only heating the heating point when the heating point needs to be heated in the current line printing period according to the original data and the heating point is heated in the previous two continuous line printing periods.
Specifically, the line printing cycle is equally divided into four consecutive time periods, which are time period a, time period B, time period C, and time period D, respectively, in that order. The division of the line printing cycle is not limited to the four consecutive time periods.
If the heating point does not need to be heated in the current line printing period according to the original data, the heating point is not heated in the time period A, the time period B, the time period C and the time period D;
if the heating point needs to be heated in the current line printing period according to the original data, (1) heating the heating point in a time period A and a time period C; (1) heating the heating dot in a time period B only when the heating dot is not heated in the previous two consecutive line printing cycles; (3) the heating dot is heated in the time period C only when the heating dot is heated in the preceding two consecutive line printing cycles.
The present invention discloses in one embodiment a storage medium having stored thereon a computer program that, when executed, implements a thermal print head heating data history control method as described in any one of the above.
The invention discloses and protects, in one embodiment, a printer comprising the storage medium described above.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (7)
1. The method comprises the steps of acquiring original data of heating points, wherein the original data is generated by a printer according to printing content in a line printing period and used for controlling whether the heating points are heated; the method is characterized by further comprising the following steps of dividing a line printing cycle into at least two time periods, and controlling the heating points in the time periods:
if the heating point does not need to be heated in the current line printing period according to the original data, the heating point is not heated in the whole time period;
if the heating point needs to be heated in the current line printing period according to the original data, at least one time period exists for heating the heating point; and there is at least one other time period for determining whether to heat the heated dot based on whether the heated dot has been heated in at least one preceding line of print cycles.
2. The method of controlling heating data history of a thermal head according to claim 1, wherein: the determining whether to heat the heating point according to whether the heating point has heating in at least one previous line of printing period specifically comprises:
heating the heating point only when the heating point needs to be heated in the current line printing period according to the original data and the heating point is not heated in the previous two continuous line printing periods;
or only heating the heating point when the heating point needs to be heated in the current line printing period according to the original data and the heating point is heated in the previous two continuous line printing periods.
3. The method of controlling heating data history of a thermal head according to claim 1 or 2, wherein: the number of the other time segments is at least two, and the time segments are not consecutive to each other on the time axis.
4. The method of controlling heating data history of a thermal head according to claim 2, wherein: dividing a line printing cycle into four continuous time periods, namely a time period A, a time period B, a time period C and a time period D;
if the heating point does not need to be heated in the current line printing period according to the original data, the heating point is not heated in the time period A, the time period B, the time period C and the time period D;
if the heating point needs to be heated in the current line printing period according to the original data, (1) heating the heating point in a time period A and a time period C; (1) heating the heating dot in a time period B only when the heating dot is not heated in the previous two consecutive line printing cycles; (3) the heating dot is heated in the time period C only when the heating dot is heated in the preceding two consecutive line printing cycles.
5. The method of controlling heating data history of a thermal head according to claim 4, wherein: the time periods A, B, C and D are the same in duration.
6. A storage medium having a computer program stored thereon, characterized in that: the computer program when executed implements the thermal print head heating data history control method according to any one of claims 1 to 5.
7. A printer, characterized by: a storage medium comprising a storage medium as claimed in claim 6.
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