JPS6078758A - Printing system of dot printer - Google Patents

Abstract

PURPOSE:To enable printing to perform by treating letter patterns composed of vertical 9-dots by the same way of treating letter patterns composed of vertical 7-dots by providing shift-designated bit for a letter pattern-generating memory. CONSTITUTION:A micro processor 1 receives printing data from the interface on the basis of program stored in a read-only memory 2. Whereupon, letter dot pattern is read from the lead-only memory 3 on the basis of data as address. The r8'' bit for every column of letter dot pattern lead is checked by the micro processor 1, and when the bit is the shift designated bit of the logic 1, 2-bit is shifted in the downward direction. In the case of logic 0, the bit is left as it is because of no existence of shift.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a printing method for a dot printer that has a printing element of 9 vertical dots and prints characters, symbols, etc. with a collection of dots.

(Prior Art) The print head of a serial dot printer is usually composed of nine dots. This consists of a dot matrix of characters and symbols, etc., in a range of 7 vertical dots l-1 horizontal 9 dots.
J + p + q + y @ is printed 2 dots lower than other alphabetic characters (descender character) for a good balance of characters, and when adding an underline to characters and symbols as shown on the right side of Figure 1, 9. The only way to do this is to assign an underline to each dot and complete the printing of characters, symbols, and underlines in one printing process.

FIG. 1 shows an example of printing with a vertical 9-dot print head.

As mentioned above, some of the characters and symbols printed on dot printers require a dot matrix with a character height of 9 vertical dots, and the microprocessor and memory used to control the dot printer are 1 byte (8 Since the information is based on information in bits, complex processing was required to handle 9-bit data. One example will be explained with reference to FIG.

Fig. 2 (I) shows a print head composed of 9 dots printing elements, Fig. 2 (6) shows an example of printing 1/4 symbol of a dot matrix pattern composed of 9 dots vertically and 9 dots horizontally. Figure 2 (Ill is the content of the memory that stores the dot matrix pattern of Figure 2 (6), and the 9-bit data of r9 is stored in c10' and 011'. ○ is a logic "1" and is printed as a dot. and the other unmarked dots are logic ″′
0", no dots are printed. When printing 9 dots in the 01 column in FIG. 2 (11), the data to be printed in r1 to r8 is stored in the pattern memory stored at the address cl' in FIG. 2 410. The data printed on r9 is read out from address clO'e in Figure 2 (G).
The bit data of r1' is used.

Similarly, for printing in column c2 in FIG. 2 (6), the data to be printed in r1 to r8 is read from address c2' in FIG. The bit data of e-read r2' is used.

After that, it is repeated sequentially, and the printing in column 09 of Figure 2 01) is r.
The data to be printed in 1 to r8 is set to address c in Figure 2 (E).
The data read from c9' and printed on c9 is shown in Figure 2 (J
Read address cll' of IB and use all bit data of r1'.

With the above process, a single character consisting of 9 vertical dots is printed, but as is clear from the explanation, in the conventional method, characters that require 9 vertical dots increase the capacity of the dot pattern memory, and 9 dots are printed. This method had the drawback of requiring complicated processing to print the eye data.

(Object of the Invention) The present invention solves the above-mentioned drawbacks, and has a small memory capacity for character pattern generation, and prints a character pattern consisting of 9 vertical dots using the same process as a character pattern consisting of 7 vertical dots. The purpose is to create a printing method for dot printers that allows printing.

(Structure of the Invention) The present invention provides a shift specification bit in part of the data for each column of the character pattern generation memory to determine whether to shift and print the character pattern data of that column, and the microprocessor reads the data. Check the shift designation bit for each column of the dot pattern of characters, etc., and shift if the shift designation bit specifies the dot, edit and print the character pattern consisting of 9 vertical dots. It is characterized by

(Embodiment) FIG. 3 is a block diagram showing an embodiment of the present invention.
is the microprocessor (CPU) that controls the printer,
2 is a read-only memory (ROMa) in which programs are stored, 3 is a read-only memory (ROMb) which is a character pattern generation memory in which dot patterns such as characters and symbols are stored, and 4 is a read-only memory (ROMb) that stores dot patterns such as characters and symbols. The f/(u driver 5 is connected to this I//(J driver 4 and is a print head having nine vertical printing elements.I10 driver 4 is driven by a command.
is further connected to a printing paper line feed motor (not shown) and a spacing motor for moving the print head in the printing direction, as well as to an interface section for receiving print data from an external device.

6 is a microprocessor 1. read only memory 2,
3 and the I10 driver 4.

With the circuit configured as described above, the microprocessor 1 receives print data from the interface according to the program stored in the read-only memory 2. When the print data is received, a character dot pattern is read from the read-only memory 3 using the data as an address.

FIG. 4 (1) illustrates a storage method of the read-only memory 3, which is a memory for character pattern generation according to the present invention, and the character pattern is shown in FIG. ○ is stored as a logic "1", and other no marks are stored as a logic "0". Here, this is a bit that specifies whether to shift the data of each column vertically to the "r8" column.

The microprocessor 1 checks the bit r8'' for each column of the read character dot pattern, and if the bit is the shift designation bit of logic u1'', shifts it 2 bits downward in FIG. 4(1), If the logic is 0'0'', no shift is performed and the bit is left as is.The shift designation bit of r8' is not used as print data and is discarded.

Figure 4 ([1) is Figure 4 (1) t microprocessor 1
Figure 4 (1) is a diagram of the dot pattern after processing.
The columns c2', c5", C7", and c9" are shifted downward by 2 bits. By driving the print head 5 through the I10 driver 4 at the printing timing for each column, the print head 5 shown in FIG. This becomes the printing pattern.

In addition, for characters and symbols composed of 7 vertical dots, in the case of descender characters, all the r8'' Villatra are Logic II
I II, and when printing, print with two dots lowered, and for other characters, set the bit ' of r8 to logical °'0', so that'=! Print at the mark position. This makes it possible to simplify the control of a character pattern consisting of vertical 9 dots and vertical 7 dots by using the same program. Microprocessor 1 pays attention to the r8'' bit and sets the logic to ``1''.
This is because only in the case of ``, this can be done by shifting the data of rl'' to r7'' by 2 bits and outputting the shifted data.

In the above embodiment, the r8" bit in FIG. 4 (1) is used as a downward shift designation bit, but the same effect can be obtained by using the rl" bit as an upward shift designation bit. .

(Effects of the Invention) According to the present invention described above, since the character pattern generation memory has bits for shifting all print pattern data for each column, character patterns consisting of 9 vertical dots can be changed from other standard vertical dots. Character pattern generation memo 1 which is the same as the 7-dot character pattern] It has the effect that it can be made into an inexpensive dot printer because of its capacity and processing program.

[Brief explanation of the drawings] Figure 1 is a print pattern diagram using a vertical 9-dot print head, Figure 2 (1) is a plan view of the vertical 9-dot print head, and the second pattern D is a vertical 9-dot character. A diagram of the printed turn,
FIG. 2(E) is a memory storage diagram of the print pattern of FIG. 2(6) according to the conventional method, FIG. 3 is a configuration diagram of a printer according to the present invention, and FIG. 4(1) is a memory storage diagram according to the present invention. ,
FIG. 4(6) is a diagram showing a turn diagram after processing the character pattern stored according to the present invention. 1...Microprocessor 2,3...Read-only memory 4...I10 driver 5...Print head patent applicant Oki Electric Industry Co., Ltd. agent Patent attorney Takashi Kanakura 274 2 3 Noodles 4- ( 1) 1 23456789

Claims (1)

[Claims] ■. Characters, symbols, etc. are printed with a collection of dots, vertically 9
In the printing method of a dot printer that has a dot printing element, a shift specification bit is provided in part of the data for each column of the character pattern generation memory to shift and print the character pattern data of that column, and the microprocessor reads it. The above-mentioned shift designation bits for each column of dot patterns such as characters are checked, and if the shift designation bits are the specified bits, the characters are shifted and a character pattern consisting of 9 vertical dots is edited and printed. A dot printer printing method. 2. A printing method for a dot printer according to claim 1, characterized in that a shift designation bit is located in the eighth vertical bit of the character pattern generation memory. 3. A printing method for a dot printer according to claim 1, characterized in that a shift designation bit is provided at the first vertical pitch of the memory for character pattern generation.