WO2010102550A1

WO2010102550A1 - Method and device for inverse printing

Info

Publication number: WO2010102550A1
Application number: PCT/CN2010/070918
Authority: WO
Inventors: 许加波; 徐伟伟; 丁进峰; 杨现刚; 张新平
Original assignee: 山东新北洋信息技术股份有限公司
Priority date: 2009-03-11
Filing date: 2010-03-08
Publication date: 2010-09-16
Also published as: CN101833425A

Abstract

The present invention belongs to the field of printing technology and provides a method and device for inverse printing, so as to solve the problem in the prior art that the inverse printing is inefficient. The method includes: receiving character data; dividing the character data into a plurality of subranges; implementing the inverse printing successively for the subranges in a sequence opposite to the receiving sequence. The beneficial effect of the present invention is that the efficiency of the inverse printing can be improved and the memory overhead can be saved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of printing technology, and in particular to an inverted printing method and apparatus. BACKGROUND OF THE INVENTION Data received by printers can generally be classified into two categories: character data in text format and print data in graphic format. Print data in graphic format can be printed directly, without the need for printer conversion, but the amount of data is large, the transmission time is long and large-capacity memory is required; the character data in text format cannot be directly printed, and must be in the printer from text format to print format. Data conversion, but the amount of data is small, the transmission time is short, and the cache is required to be small. Office printers use a graphic format to print more, while small printers, such as supermarkets and restaurants, use POS files in most text formats. Depending on how the printhead is printed, small printers include: Line-printed printers that print in rows, such as thermal printers, thermal transfer printers, etc.; column printers that print in columns, such as single-column 40-type printers. In most cases, the printer prints in the order in which it was received, and the direction in which the characters are printed coincides with the direction in which the media advances, as shown in Figure la. In some special applications, such as in the kitchen, when saving the space and hanging the printer on the wall, in order to facilitate the user to view the printed content, it is necessary to print the characters in the opposite direction to the media, and the information received first is printed. The information received later is printed first, as shown in Figure lb, the so-called inverted print. In general, when the character data of the text format is inverted, the character data of all the character lines is formatted at one time, and then the converted character data is inverted and printed. The processing method is simple and easy, and the number of character lines is relatively small. In the case of a better work; when the number of character lines is relatively large, because the amount of generated character data is large, so the required memory is large, and it takes a long time to process all the character lines, greatly reducing the printer's Performance, especially when the number of character lines is large and the amount of character data generated exceeds its storage capacity, the printer does not even work properly. SUMMARY OF THE INVENTION An object of the present invention is to provide an inverted printing method and apparatus for implementing inverted printing of multi-line data in a text format, which requires less memory and has a faster processing speed, and is particularly suitable for a low-cost POS printer for Solving the reverse printing speed in the prior art, the memory consumption is large, and the efficiency is Low problem. In order to solve the above technical problem, an embodiment of the present invention provides an inverted printing method, the method comprising: receiving character data; dividing the character data into a plurality of sub-regions; and sequentially inverting the sub-regions in reverse order of receiving . According to a further aspect of the method of the embodiment of the present invention, dividing the character data into a plurality of sub-regions may include: determining a total number of character lines n of the character data, wherein n is a natural number; , dividing the character data into n sub-regions. According to still another aspect of the method of the embodiment of the present invention, before the content in the sub-area is inverted, the method further includes: converting character data in the sub-area into dot matrix data. According to another further aspect of the method of the embodiments of the present invention, performing the inversion printing on the sub-areas may include: a) sorting the dot matrix data into m dot rows/columns in units of dot rows/columns and sorting b) Reversely print the reverse order data of a row/column in the sub-area; c) Determine whether the m-row/column is printed, and if the printing is completed, end, otherwise return to step b). According to still another aspect of the method of the embodiment of the present invention, performing the inverse printing on the sub-area further comprises: performing 180-degree rotation on the lattice data; and printing the rotated lattice data. According to still another aspect of the method of the embodiment of the present invention, the method for performing 180 degree rotation on the dot matrix data may include: dividing the dot matrix data into m dot rows/columns in units of dot rows/columns And sort; reverse dot row/column data between all point rows/columns in the subregion; Reverses point data in all point rows/columns in a subregion. In order to solve the above technical problem, an embodiment of the present invention further provides an inverted printing apparatus, the apparatus comprising: a communication interface, configured to receive character data sent from a host; and a full area data processing unit, configured to: Dividing into a plurality of sub-regions and sorting; sub-region format processing unit, converting character data in the sub-region into lattice data in reverse order; sub-region inversion processing unit, inverting lattice data in the sub-region; The printing unit performs printing according to the inverted dot matrix data. The beneficial effects of the embodiments of the present invention are that the method can significantly improve memory utilization and save printing waiting time. Generally, in the process, all data in the entire area, that is, n sub-area data, is converted at one time. If the character data generated by each sub-area is m bytes, the character data of the entire print area occupies a memory space of n*m bytes; With the solution of the present invention, if only one sub-area is processed at a time, and the occupied memory space is m bytes, the control method can save space by about (n-l)*m bytes. If it takes x milliseconds to convert a sub-area, the prior art requires n*X milliseconds to convert all sub-area data at a time, and the method of the present invention can reduce the waiting time of (n-1)*X milliseconds. It can be seen that the more character lines in the inverted print area, the more memory saved by the control method and the shorter the print waiting time. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and in FIG In the drawings: Figure la is a schematic diagram of a positive sequence printing in the prior art; Figure lb is a schematic diagram of an inverted printing in the prior art; Figure 2 is a flow chart of a first embodiment of the inverted printing method of the present invention; A flow chart of a second embodiment of the inverted printing method of the present invention is shown; 4 is a flow chart of an embodiment of a method for printing an inverted printing according to the present invention; FIG. 5 is a flow chart showing an embodiment of a method for printing a 180 degree line of inverted printing in an inverted printing according to the present invention; FIG. 7 is a flow chart of an embodiment of a method for printing an inverted column in reverse printing according to the present invention; FIG. 8 is a flow chart showing an embodiment of a method for printing a 180 degree column inversion in reverse printing according to the present invention; FIG. 9b is a schematic diagram of the dot matrix data of the sub-area in the row inversion printing in the embodiment; FIG. 9c is a schematic diagram of the dot matrix data in the row in the embodiment; FIG. FIG. 10a is a schematic diagram of the dot matrix data of the sub-area in the positive sequence printing in the embodiment; FIG. 10b is a schematic diagram of the dot matrix data of the sub-area in the column inversion printing in the embodiment; FIG. 10c is a schematic diagram showing the dot matrix data of the sub-region when the 180-degree column is inverted and printed in the embodiment; FIG. 11 is a schematic diagram of data processing of the whole region; FIG. 12 is a data processing of the sub-region. It is intended; FIG. 13 is a configuration diagram of an inverted embodiment of the printing apparatus according to the invention. DETAILED DESCRIPTION OF THE INVENTION In order to make the objects, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the embodiments and drawings. The illustrative embodiments of the present invention and the description thereof are intended to explain the present invention, but are not intended to limit the invention. Embodiments of the present invention provide an inverted printing method and apparatus. The invention will be described in detail below with reference to the accompanying drawings. 2 is a flow chart of a first embodiment of an inverted printing method according to the present invention. The inverted printing method according to the first embodiment of the present invention may include the following steps: Step 201: Receive character data. Step 202: Divide the character data into a plurality of sub-regions, and sort the plurality of sub-regions. Step 203: Invert the sub-regions in reverse order of receiving. As an embodiment of the present invention, before the step 202, an instruction for determining whether the user issues an inverted print is received. If an inverted print command is received, the process proceeds to step 202, otherwise, the normal positive sequence printing is performed, that is, according to the data reception. The received data is printed in sequence. Since the positive sequence printing method is a well-known technique, it is not mentioned here. The processing steps of the inverted printing method of the second embodiment will be described with reference to Figs. 3, 11, and 12. This embodiment is applicable to a printing apparatus for a line head. The inverted printing method according to the second embodiment of the present invention may include the following steps: Step 301: Receive character data in a text format. Step 302: Print area division, and process all the data in the received data buffer 111. According to the data receiving order 1105, determine the number of character lines n of the text data according to the line width, the line feed instruction, etc., where n is a natural number. And sorting from 1 to n, the print buffer 111 is divided into sub-regions 1101, 1102, 1103, 1104 and the like. Step 303: Record the sub-area attribute, record the first address and the tail address of the character data in the receiving buffer in each sub-area in the order from 1 to n, that is, the address attribute; record line attributes such as line height and character magnification, Both address attributes and line attributes are print attributes. Step 304: Convert character data in the sub-area into dot matrix data. As an embodiment of the present invention, the sub-area data is format-converted in reverse order, starting from the n-th sub-area i or 1104, sub-area i or 1104, 1103, 1102 in order from n to 1.

The character data in 1101 is processed, and the character data of the sub-area is searched according to the address attribute such as the first address and the tail address of the sub-region character data in the receiving buffer; according to the row height and the line width of the sub-area, The line attribute such as the character magnification is used to determine the size of the dot matrix data amount in the sub-area; the character data to the dot matrix data is converted in the character data in the sub-area, and the converted dot matrix data is stored in the sub-area In the domain print buffer, since the height of the character lines and the rows of each sub-area are not necessarily the same, the amount of lattice data generated by each sub-area is not necessarily the same, for example, because the height of the character lines is different, the n-th sub-area 1104 The generated dot matrix data 1206 is larger than the dot matrix data 1207 generated by the n-1th sub-region 1103. As an embodiment of the present invention, the number of sub-area data converted each time can be adjusted according to the capacity of the printer buffer, such as one, two, etc., because the amount of bitmap data is relatively large, the most memory-saving case Convert only one sub-area, that is, invert the dot matrix data of the sub-region every time the sub-region character data is converted, and then perform the format conversion on the next sub-region, and sequentially cycle; when it is necessary to reduce the print waiting time, use more A dot matrix data buffer that can convert multiple sub-region character data at a time. Step 305: Select a sub-area inversion printing mode of the user, and select an appropriate printing mode according to requirements: line inversion printing or 180 degree line rotation inversion printing. If line inversion printing is selected, then step 4 is gathered 306; if 180 degree line rotation inversion printing is selected, then step 4 is gathered 307. Step 306: Perform inverted printing on the dot matrix data in the sub-region print buffer. Step 307: Perform 180-degree rotation inversion printing on the dot matrix data in the sub-region print buffer. Step 308: Determine whether all sub-areas are printed. If no printing is completed, return to step 304 to continue the processing of the next sub-area, otherwise, the process ends. The processing of the sub-area is as shown in Fig. 12. In the direction of 1210, the dot matrix data 1206 of the nth sub-area is printed first, and then the dot matrix data 1207 of the n-th sub-area is printed upside down, and the printing is sequentially performed until the printing is performed. The dot matrix data 1209 of one sub-area, the final print result is as shown at 122, and the inverted printing of the full-area received data 111 is realized. FIG. 4 is a flow chart of an embodiment of a line inversion printing method according to the present invention. The method of this embodiment includes the following steps: Step 401: Sub-region dot matrix data is divided into units of dot line data that can be printed by the printing unit, and the dot row data is arranged in order from top to bottom. Among them, each character row dot matrix data is composed of thousands of dots. The sub-area dot row division and the data transmission order will be described below with reference to FIGS. 9a and 9b. Figure 9a The figure shows the sub-area dot matrix data in the positive sequence printing in the embodiment, and FIG. 9b shows the sub-area dot matrix data in the row inversion printing in the embodiment. For example, in the printing unit, k points can be printed in each line. In the print buffer 90 in FIG. 9a, dot matrix data of m dots and k dots per row are stored, and the order of sending data between rows in the print buffer is as follows: As shown; the order in which the inline data is sent is 902. To achieve inverted printing of character data in the print buffer, firstly, the order of sending data between lines in the buffer is reversed, from 1st to mth to mth to 1st, as shown by 903 in FIG. 9b; Then, the order of transmission of the in-row data is reversed, from the 1st to the kth to the kth to the 1st, as shown by 904 in FIG. 9b. Step 402: Read a row of data in reverse order. That is, as shown in the direction of 903 in Fig. 9b, in the order of the mth to the first line, starting from the mth line, one line of data is read at a time. Step 403: Send the point data in the dot row to the printing unit in reverse order. In the direction shown by 904 in Fig. 9b, the dot data step 404 in the dot row is sequentially transmitted in the order from the kth to the 1st dot, and the dot row data is printed. Step 405: Determine whether all the lines are printed, and if the printing is completed, the process ends, otherwise return to step 402. FIG. 5 is a flow chart showing an embodiment of a 180 degree line rotation inversion printing method in an inverted printing according to the present invention. The method of this embodiment includes the following steps: Step 501: Divide the sub-area dot matrix data in a dot row unit, and sort the dot row data in order from top to bottom. Among them, the dot matrix data of each character line is composed of thousands of dots. Step 502: Upside down all point data in the sub-area. Step 503: Invert the in-row point data of all the dot rows in the sub-area left and right. FIG. 9a is a schematic diagram of the sub-area dot matrix data in the row mode positive sequence printing in the embodiment, and FIG. 9c is a schematic diagram of the sub-region dot matrix data in the row mode 180-degree line inversion printing in the embodiment. The data of m rows * k points in the print buffer 90 in FIG. 9a is rotated by 180 degrees, and converted into data of m rows * k dots in the print buffer 92 of FIG. 9c, that is, between rows in the buffer. The data is upside down and the data in the row is reversed. Step 504, according to the direction of 905 in Fig. 9c, in the order of the 1st to mth rows (the mth row to the 1st row of the actual dot row data), starting from the 1st row, one line of data is read line by line. Step 505, in accordance with the direction of 906 in Fig. 9c, sequentially transmit the dot row data in the order of points 1 to k (the order of the kth point to the 1st point of the actual data). Step 506, printing the dot row data. Step 507, it is judged whether all the dot lines are printed, and if the printing is completed, the process ends, otherwise the process returns to step 504. FIG. 6 is a flow chart showing a third embodiment of the inverted printing method of the present invention. The printing device of the present embodiment is applicable to the printing device of the column print head, and is basically the same as the main steps of the second embodiment, with the difference that the specific embodiment when performing sub-area data inversion printing is different. The third embodiment of the inverted printing method of the present invention may include the following steps: Step 601: Receive character data in a text format. Step 602: Print area division, and process all data in the received data buffer. According to the data receiving order, determine the number of character lines n of the text data according to the line width, the line feed instruction, etc., where n is a natural number, and according to the 1 to η · ίφ order. Step 603, recording sub-area attributes, recording the first address and the tail address of the character data in the receiving buffer in each sub-area in the order from 1 to η, that is, the address attribute; recording line attributes such as line height and character magnification, Both address attributes and line attributes are print attributes. Step 604, performing format conversion on the sub-area data in reverse order, starting from the n-th sub-area, processing the sub-area character data one by one in the order from η to 1, and ranking the first address of the sub-area character data in the receiving buffer And the address attribute such as the tail address, searching for the character data of the sub-area; determining the size of the sub-area dot matrix data according to the row attribute of the sub-area such as the row height, the line width, and the character magnification; and performing the character data in the sub-area The format conversion of character data to dot matrix data, the converted dot matrix data is stored in the sub-region print buffer, since the height of the character row and the row of each sub-region is not necessarily the same, the amount of lattice data generated by each sub-region The size is not necessarily the same. Step 605: Select a sub-area inversion printing mode of the user, and select an appropriate printing mode according to requirements: column inversion printing or 180 degree column rotation inversion printing. If you select column inversion printing, Then, proceed to step 606; if 180 degree column rotation printing is selected, then step 607 is entered. Step 606: Perform column inversion printing on the dot matrix data in the sub-region print buffer. Step 607: Perform 180-degree column rotation inversion printing on the dot matrix data in the sub-region print buffer. Step 608: Determine whether all sub-areas are printed. If no printing is completed, return to step l 604, otherwise end. FIG. 7 is a flow chart showing an embodiment of a method for printing an inverted column in an inverted printing according to the present invention. The embodiment of the method for inverting printing in the inverted printing of the present invention may include the following steps: Step 701: Divide the sub-area dot matrix data in units of dot-column data that can be printed by the printing unit, and sort the data according to the order from left to right. Sort. The sub-area point column division and the data transmission order will be described below with reference to Figs. 10a and 10b. FIG. 10a is a schematic diagram showing the dot matrix data of the sub-area in the positive sequence printing in the embodiment, and FIG. 10b is a schematic diagram showing the dot matrix data of the sub-area in the column inversion printing in the embodiment. For example, in the printing unit 100, the dot matrix data of the k dot column and the m dot of each column is stored in the print buffer 100 in FIG. 10a, and the order of sending the data between the columns in the print buffer is 1001. As shown; the order in which the data in the column is sent is 1002. To achieve inverted printing of character data in the print buffer, first reverse the order of sending data between columns in the buffer, from column 1 to column k to column k to column 1, as shown in 1003 of Figure 10b. Then, the order in which the data in the column is reversed is changed from the 1st to the mth point to the mth to the 1st point, and the mouth is shown as 1004 in Fig. 10b. Step 702: Read a column of data in reverse order. That is, as shown in the direction of 1003 in Fig. 10b, in the order of the kth to the 1st column, starting from the kth column, one column of data is read at a time. Step 703: Send the point data of the dot column to the printing unit in reverse order. In the direction shown by 1004 in Fig. 10b, the dot column data step 704 is sequentially transmitted in the order from the mth to the 1st point, and the dot column data is printed. Step 705: Determine whether all the dot columns are printed, and if the printing is completed, the process ends, otherwise return to step 702. FIG. 8 is a flowchart of an embodiment of a 180 degree column rotation inverted printing method in an inverted printing according to the present invention. Figure. The embodiment of the 180 degree column rotation inversion printing method in the inverted printing of the present invention may include the following steps: Step 801: Sub-area dot matrix data is divided into units of dot columns, and the dot column data is sorted in order from left to right. In step 802, the data of all the points in the sub-area is reversed. Step 803: Upside down the point data in all the point columns in the sub-area. FIG. 10a is a schematic diagram of the dot matrix data of the sub-area in the positive sequence printing in the embodiment, and FIG. 10c is a schematic diagram of the dot matrix data in the sub-area of the 180 degree column inversion printing in the embodiment. The dot matrix data of the k column * m points in the print buffer 100 in FIG. 10a is rotated by 180 degrees, and converted into dot matrix data of k columns * m points in the print buffer 102 in FIG. 10c, that is, the buffer data is realized. The data in the column is reversed left and right, and the data in the column is upside down. Step 804, in accordance with the direction of 1005 in Fig. 10c, in the order of the first to kth columns (the kth to the 1st column of the actual data), starting from the first column, sequentially reading a column of data. Step 805: According to the direction of 1006 in Fig. 10c, a bit of column data is transmitted in the order of points 1 to m (the mth to the 1st point of the actual data). Step 806: Print the dot column character data. Step 4 gathers 807, judges whether all the dot columns are printed, and ends if the printing is completed, otherwise returns to step 804. FIG. 13 is a structural diagram of an embodiment of an inverted printing apparatus according to the present invention. The inverted printing apparatus of the present invention may include: a communication interface 1301, a processing unit, and a printing unit 1306. The communication interface 1301 is configured to receive character data sent from the host. And a processing unit, configured to divide the character data into a plurality of sub-regions. The printing unit 1306 is configured to perform inversion printing on the sub-areas in the reverse order of receiving. The processing unit may include: a full-area data processing unit 1303, where the sub-region format The unit 1304, the sub-area inversion processing unit 1305. In this embodiment, the inverted printing device may include: a communication interface 1301, a receiving buffer 1302, a full area i or a data processing unit 1303, a sub-area i or a format processing unit 1304, a sub-area i or an inversion processing unit 1305, printing Unit 1306. The communication interface 1301 is configured to receive character data in a text format sent from the host and store the character data in the receiving buffer 1302. A receive buffer 1302 is configured to store the character data. The full area data processing unit 1303 is configured to divide the character data into a plurality of sub-areas, and sort the plurality of sub-areas. The received character data is detected, and each line of character data is received to generate various attributes of the line data and the attribute is recorded: determining a first address and a tail address of the line character data in the entire receiving buffer, that is, an address attribute; The row attribute of the line character data is generated according to the received line height, and the address attribute and the line attribute of the line character data are stored. The sub-area format processing unit 1304 divides the received character data into n sub-areas in a character line unit and performs sorting from 1 to n, and performs format conversion on each line of character data in order from n to 1: based on sub-region character data The address attribute searches for the character data of the sub-area; converts the character data to the dot matrix data according to the line attribute of the sub-area, and converts the converted dot matrix data to be stored in the sub-area. In the rushing area. The sub-area inversion processing unit 1305 performs inversion processing on the dot matrix data stored in the sub-region buffer and transmits the processed lattice data to the printing unit in rows/columns. The printing unit 1306 prints the dot matrix data in rows/columns. As an embodiment of the present invention, the sub-area inversion processing unit 1305 can transmit the row/column dot matrix data to the printing unit 1306 for processing one row/column matrix data, and perform printing processing: The column mode divides the dot matrix data in the print buffer, reads the row/column dot matrix data in reverse order, sends the dot data of the dot row/column in reverse order, prints the dot row/column data; and then reads the next row in reverse order. /column data, the dot data in the dot row/column is sent to the printing unit 1306 in reverse order, and the printing process is performed until all the dot row/column data in the print buffer is completely printed. As an embodiment of the present invention, the sub-area inversion processing unit 1305 divides the dot matrix data according to the dot row/column manner, and then performs 180 rotations on all the row/column dot matrix data in the print buffer at one time. Then read each row/column data row by row/column, send the point data of the point row/column and hit Print the dot row/column data until all dot row/column data in the print buffer has been printed. The method for rotating the dot matrix data is as follows: When the printing unit 1306 prints the data according to the dot row, the dot matrix data is divided by the dot row, and the dot row data between all the dot rows in the subregion is inverted upside down, and then all the dot rows are reversed left and right. When the printing unit 1306 prints data according to the dot column, the dot matrix data is divided by the dot column, and the dot column data between all the dot columns in the sub-area is inverted first and right, and the dot data in all the dot columns is reversed. The beneficial effects of the embodiments of the present invention are that the method can significantly improve memory utilization and save printing waiting time. In the prior art, all character data in the entire area, that is, n sub-region character data, is converted at one time. If the character data generated by each sub-area is m bytes, the character data of the entire print area occupies a memory space of n*m words. In the scheme of the present invention, if __ only processes one sub-area at a time, and the occupied memory space is m bytes, the control method can save space by about (n-l)*m bytes. If it takes X milliseconds to convert the character data of one sub-area, the prior art requires n * X milliseconds to convert the character data of all sub-areas at a time, and the method of the present invention can reduce the waiting time of (n-1) * X milliseconds. It can be seen that the more character lines in the inverted print area, the more memory saved by the control method and the shorter the print waiting time. The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. The scope of the protection, any modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

Claim

An inverted printing method, characterized in that the method comprises:

Receiving character data;

Dividing the character data into a plurality of sub-regions;

The sub-areas are in reverse printed in the reverse order of reception.

2. The method according to claim 1, wherein dividing the character data into a plurality of sub-areas comprises:

Determining the total number of character lines n of the character data, where n is a natural number; dividing the character data into _n sub-regions in the character row unit.

3. The method according to claim 1, wherein before performing the inverse printing on the sub-area, the method further comprises: converting character data in the sub-area into dot matrix data.

4. The method according to claim 3, wherein the inverting printing of the sub-area comprises:

a) dividing the dot matrix data into m dot rows/columns in units of dot rows/columns and sorting; b) printing reverse order data of one row/column in the subregion in reverse order; c) judging m rows/columns Whether it is printed, if the printing is completed, it ends, otherwise it returns to step b).

5. The method according to claim 3, wherein the inverting printing the sub-area further comprises:

Performing a 180 degree rotation on the lattice data;

The rotated dot matrix data is printed.

6. The method according to claim 5, wherein the method of performing 180 degree rotation on the lattice data comprises:

Sorting the dot matrix data into m dot rows/columns in units of dot rows/columns and sorting; inverting dot row/column data between all dot rows/columns in the subregion; Reverses point data in all point rows/columns in the sub-area. An inverted printing device, characterized in that the device comprises:

a communication interface, configured to receive character data sent from the host; and a processing unit, configured to divide the character data into a plurality of sub-areas;

a printing unit, configured to invert the sub-areas in turn in the reverse order of receiving. The apparatus according to claim 7, wherein the processing unit comprises:

a full area data processing unit, configured to divide the character data into a plurality of sub-areas and sort them;

a sub-region format processing unit that converts character data in the sub-region into bitmap data in reverse order;

The sub-area inversion processing unit performs inversion processing on the lattice data in the sub-area;

The printing unit performs printing according to the inverted dot matrix data.