JPH01310968A - High speed printing of printer - Google Patents

Abstract

PURPOSE:To perform high speed printing of a twofold speed or more without lowering printing density, by downwardly shifting the N-th input data and (N-1)-th input data from the top of printing dots by one dot to print the operational processing result of OR. CONSTITUTION:The image data (LD) corresponding to a printing head is stored in a data register 1. The (N-1)-th data (LDO) to the N-th printing head from the top is similarly stored in a data register 2 and downwardly shifted by one dot by an operation circuit 3. This shifted data by the circuit 3 and the original N-th data stored in the register 1 are operated by an OR logical operation circuit to be stored in a dot row register 4 as the data of this time. The previously printed data is stored in a data memory 5, and the data of the register 4 and that of the memory 5 are operated as data at every one pin by an operation circuit 6 to be stored in a printing data register 7. A high speed printing control circuit 8 is operated and a printer is driven at a high speed by a printing driving part 9 to perform printing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printing method for a dot matrix printer.

(Prior Art) The printing speed of a dot matrix printer is determined by the repetition cycle time of the dot print head. Therefore, it is well known that in order to increase the printing speed with a limited number of print heads, the printing speed can be increased by operating the same dot element so that the minimum distance between dots in the horizontal direction is increased. That is, the method was to thin out each dot row before printing the print pattern, or to store a pre-thinned font and print it.

By the way, in order to improve printing quality, there has been a technique described in Japanese Patent Laid-Open No. 60-230867 as a technique in this field. The configuration will be explained below with reference to the drawings.

FIG. 7 is a block diagram showing conventional thinning printing. Image data (LD) corresponding to the print head is stored in the dot row register 4 as one vertical column of print data.

The previously printed data for one vertical column is stored in the data memory 5, and the data in the dot row register 4 and the data in the data memory 5 are computed by the arithmetic circuit 6 as data for each pin, and the data is stored in the print data register file. and stored as print data. During high-speed printing, the high-speed printing control circuit 8 operates and the print data is driven by the print drive section 9 and printed at a higher speed than the normal printing speed. Further, the print data in the print data register 7 is stored in the data memory 5 in order to calculate the next dot string.

FIG. 8 explains in detail the operation of the arithmetic circuit 6 in FIG. 7. This arithmetic circuit 6 prevents the data of each dot from being printed consecutively, so that for any dot unit data, if the previous data in the data memory 5 has been printed, the next data in the dot row register 4 will be printed. Regardless of the content of the data in the dot bin, the data in that dot bin is calculated as data that will not be printed.If the data in the row is not printed, the data in the dot bin is calculated as data that will be printed as the next data in the dot row register 4. Table 1 shows the calculation results for each dot row.

Table 1 0: Dots not printed As shown in the block diagram of FIG. 8, one example of the arithmetic circuit 6 can be realized by combining an EXOR circuit 14 and an AND circuit 15.

FIG. 9 shows the drive period of the Radbin to print a given dot at normal printing speeds and shows that this period represents the limits of the print head and defines the speed of the printer. The time chart in FIG. 10 shows that even if this print head is used, a high printing speed can be achieved by applying this method.

FIG. 11(b) shows a pattern obtained by printing the normal speed printing pattern shown in FIG. 11(a) at high speed by implementing this method, and shows that the printing quality may deteriorate. This shows that it is possible to print at double speed.

Note that when high-speed printing is not performed, printing may be performed in the same manner as described above at the normal printing speed without operating the high-speed printing control circuit 8.

(Problem to be solved by the invention) However, due to thinning printing in the conventional technology,
There was a problem that the dot density became sparse and the printed result inevitably became pale.

Therefore, the present invention can solve the problems of the prior art,
An object of the present invention is to provide a high-speed printing method for a printer that enables high-speed printing of twice or more speed without reducing print density.

(Means for Solving the Problems) In order to solve the above problems, the present invention prints one dot before each bin of a print head of a printer that prints character fonts or graphic fonts with a dot matrix configuration. A first storage circuit that stores data and a first calculation circuit that calculates the stored data and manually input data are provided, and the first calculation circuit prints the contents of the input data using the stored data. It has a printing mode in which thinning printing is performed by determining whether or not to print, and a normal printing mode in which thinning printing is not performed.
In a dot matrix printer that prints character fonts or graphic fonts by selecting a print mode, each bin of the print head is
)-th data and a second storage circuit that stores data of
a third storage circuit that stores the (N-1)th data;
The second step is to perform a logical OR operation on the th data and the Nth data.
It is characterized by the provision of an arithmetic circuit.

(Function) According to the present invention, since the high-speed printing method of the printer is configured as described above, the second arithmetic circuit is configured such that the (N-1)th data stored in the second storage circuit is The shifted data is shifted downward by one dot, and the shifted data and the third
and the Nth data stored in the storage circuit are processed by a logical sum operation. The number of printed dots increases in the vertical direction of the print head due to the action of the second arithmetic circuit.

Therefore, it is possible to eliminate the above-mentioned problems and provide a high-speed printing method for a printer that enables high-speed printing of twice or more speed without reducing the print density of 1.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. Incidentally, FIG. 6 shows a principle diagram and a print pattern diagram of a dot type printer. FIG. 6 shows an example of a dot-type printer implementing the present invention, showing the print head and the printing result of one character.
They are lined up in one vertical column and printed all at once in one vertical column. In addition, if the print heads are arranged in two vertical rows in a staggered pattern, the principle is the same even if they are arranged diagonally.

In FIG. 1, the same parts as in FIG. 7 are designated by the same reference numerals. Components in FIG. 1 that differ from those in FIG. 7 are data registers 1 and 2 and an arithmetic circuit 3. data register l
stores image data (LD) corresponding to the print head as print data. In the data register, N from the top
The data (LDO) of the (N-1)th print head bin is stored for the radbin to be printed. The arithmetic circuit 3 shifts the (N-1)th data (LDO) from the top one dot downward, and calculates this shifted data and the original Nth data stored in the data register 1. Next is a block diagram illustrating the arithmetic circuit 3 of FIG. 1. The arithmetic circuit 3 will be explained with reference to FIG. In the figure, the downward one-dot shift circuit 10 is arranged from above (N-
1) This is a circuit that shifts the Radbin data downward by one dot to the th printing. The OR circuit 11 has N from above.
This circuit calculates the Radbin data for the th printing and the data shifted by the circuit 10 using OR logic.

Subsequently, the operation of the arithmetic circuit 3 will be explained. The calculation results of circuit 10 and circuit 11 are shown in Table 2.

Table 2 The calculation results in Table 2 will be explained below with reference to the drawings.

FIG. 5 is a diagram showing an example of data corresponding to the (N-1)th and Nth print heads from the top.

In FIG. 6 showing the results calculated by the calculation circuit 3, FIG. 6(a) shows the result of shifting the (N-1)th data in FIG. 5, and FIG. 6(b) shows the result of shifting the (N-1)th data in FIG. Figure 6(a)
The result of OR logical operation processing of the data is shown.

Next, the operation of this embodiment will be explained. Image data (LD) corresponding to the print head is stored in the data register 1 as print data. The (N-1)th data (1, DO) for the Nth print head from the top is similarly stored in the data register 2, and is shifted downward by one dot by the arithmetic circuit 3. Further, the arithmetic circuit 3 performs an OR logic operation on the shifted data and the original Nth data stored in the data register 1, and stores the resultant data in the dot string register 4 as the current data. The data printed last time is stored in the data memory 5, and the data in the register 4 and the data memory 5 are combined into one by the arithmetic circuit 6.
The data is calculated for each pin and stored in the print data register 7 as print data. In order to realize high-speed printing, the high-speed printing control circuit 8 operates and the print data is driven by the print drive section 9 and printed at a higher speed than the normal printing speed. The print data in this print data register is also stored in the data memory 5 in order to calculate the next dot string. In FIG. 5, which shows the printing according to the positional embodiment of the present invention, the character "A" is printed at high speed by implementing the present invention from the printing pattern at normal speed. This shows that it can be printed with. Note that although the present invention shows an example of 2x speed printing,
For double-speed printing or higher, high-speed printing can be achieved without reducing print density by using the same method. Also, although the (N-1)th print data from the top is shifted downward, it goes without saying that the same printing operation can be performed even if the (N+1)th print data is shifted upward. Nor.

(Effects of the Invention) As explained above in detail, the present invention shifts the Nth input data and (N-1)th manual data from the top of the overprinted dots one dot downward and performs the logical sum operation. Since we decided to print the results, we can expect printing with high dot density, and by performing thinning printing using calculation processing that prevents two dots from being printed in succession, we can print at double speed with high quality and high dot density. It is possible to achieve high-speed printing as follows.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram explaining the arithmetic circuit 3 of FIG. 1, and FIG. 3 is a (N-1)th and Nth printing from the top. Figure 4 is a diagram showing the data corresponding to the head, Figure 4 is a diagram showing the results of calculation by the calculation circuit 3, Figure 5 is a diagram showing printing according to an embodiment of the present invention, and Figure 6 is the principle of a dot printer. 7 is a block diagram showing conventional thinning printing, FIG. 8 is a block diagram explaining the operation of the arithmetic circuit 6 in FIG. 7, and FIG. 9 is a diagram showing printing during normal printing. Head drive timing chart, FIG. 10 is a print head drive timing chart when thinning printing is performed, and FIG. 11 is a diagram comparing a printing pattern at normal speed and a pattern printed at high speed. 1.2: data register, 3.6: arithmetic circuit, 4: dot row register, 5: data memory, 7: print data register, 8: high-speed print control circuit, 9: print drive section.

Claims (1)

[Scope of Claims] A first storage circuit that stores print data one dot before each pin of a print head of a printer that prints a character font or a graphic font with a dot matrix configuration, and the storage data and input. a first arithmetic circuit that calculates the input data, the first arithmetic circuit determines whether or not to print the contents of the input data based on the stored data, and performs thinning printing; A dot matrix printer that has a normal print mode in which thinning printing is not performed, and further includes a circuit for controlling printing speed, and prints a character font or a graphic font by selecting the print mode, comprising: a print head; a second storage circuit that stores the (N-1)th data from the top for each pin; a third storage circuit that stores the Nth data from the top; and a third storage circuit that stores the (N-1)th data from the top. A second arithmetic circuit is provided which performs a logical OR operation on the data of A high-speed printing method for printers that is characterized by high print density.