JPH0360315B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a reverse printing method for a dot printer.

[Technical background]

Dot printers sometimes print white characters on a black background. Conventionally, this was done using a reversal printing method, in which the black character data was inverted and printed as white data based on the data to be printed in black characters. It's summery.

However, in the past, the black character data was simply inverted to obtain white data, which resulted in thin character lines, which caused the black to enter the white background due to ribbon bleeding and other effects, making it impossible to print clear characters.

[Purpose of the invention]

An object of the present invention is to obtain clear black and white reversal printing that is not affected by ribbon bleeding etc. by creating reversal data that widens the line width of the white part when performing black and white reversal.

[Summary of the invention]

In order to achieve the above object, the present invention shifts black character print data by one dot in the horizontal direction and adds only the data before and after the shift, or also adds data obtained by shifting each data before the shift by one dot in the vertical direction. , the logical sum of each data is calculated, and print pattern data is created by inverting the logical sum, thereby performing black and white inverted printing with a wide line width.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A reversal printing method according to an embodiment of the present invention, which is characterized by the purpose and outline as described above, will be described below with reference to the drawings.

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention, in which 1 is a block data memory, 2 is a dot shift circuit connected to the block data memory 1, and 3 is a block data memory.
Reference numeral 4 designates a shift data memory connected to the dot shift circuit 22, 4 an OR circuit connected to the shift data memory 3 and block data memory 1, and 5 a logic inversion circuit connected to the OR circuit 4.

Next, the operation of black and white reversal will be explained.
The explanation will be given by sequentially adding FIG. 5.

First, printing image data LD is stored in block data memory 1 as one block. This data is the pattern shown in FIG. 2, and is print data for black characters.

The image data is stored in block data memory 1.
The data is then sent to the dot shift circuit 2, where it creates data that is shifted by one dot in the horizontal direction. This data has the pattern shown in FIG.

The data is stored in the shift data memory 3.

Next, the data in the shift data memory 3 and the data in the block data memory 1, that is, the data shown in FIG. 2 and the data shown in FIG. 3, are input to the OR circuit 4 to create OR data. this,
The data is shown in FIG. 4 and forms a character pattern with a width of two horizontal dots.

The data obtained by the logical sum is inputted to the logical inverting circuit 5, and print data is created by performing the logical sum inverting. This pattern is obtained by reversing the white and black parts of the logical sum pattern shown in FIG. 4, resulting in the pattern data shown in FIG. 5.

The creation of pattern data for black-and-white inversion printing is now complete. If you use this data for printing, you can print white outlines with wide vertical line widths as shown in Figure 5. It can be done.

In the above example, printing was performed by inverting the logical sum of the data before and after the horizontal shift by one dot, so the width of the vertical line was wide. However, each data before and after the shift was shifted by one dot vertically. By creating and printing data by adding data and inverting the logical sum, horizontal lines can be widened in addition to vertical lines. Next, this will be explained based on the drawings.

First, the print data for black characters is shifted horizontally by one dot as described above to create the data before and after the shift shown in FIGS. 6 and 7.

Next, each data in Figures 6 and 7 is
The dots are shifted to create the shifted data shown in FIGS. 8 and 9.

Then, the logical sum of each data shown in FIGS. 6 to 9 is calculated, and the data shown in FIG. 10 is created.

This means that a print pattern with wide line widths both vertically and horizontally has been created. If the data in Figure 10 is inverted to create data for white printing, the data in Figure 11 is
As shown in the figure, data for white printing with wide line widths both vertically and horizontally can be created, and black and white reversal printing with wide line widths both vertically and horizontally can be performed using this print data.

〔Effect of the invention〕

As explained in detail above, in the present invention, pattern data for black and white inverted printing is obtained by inverting the logical sum of a predetermined dot pattern and a shifted version of the dot pattern. The line width of characters can be made wider, and the effect of clear white printing can be achieved without the effects of ribbon bleeding as in the past.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of a reverse printing method showing an embodiment of the present invention, FIG. 2 is a basic print data diagram, FIG. 3 is a data diagram obtained by horizontally shifting the basic print data by one dot, and FIG. Figure 5 is a data diagram of logical sum, Figure 5 is a data diagram of logical sum inversion, Figure 6 is a basic printing data diagram, Figure 7 is a data diagram that is shifted horizontally by one dot, and Figure 8 is a data diagram of logical sum inversion. 6 is a data diagram obtained by vertically shifting the data by 1 dot, FIG. 9 is a data diagram obtained by vertically shifting the data in FIG. 7 by 1 dot, FIG. 10 is a logical sum data diagram of the data in FIGS. FIG. 11 is a diagram of the inverted data. 1...Block data memory, 2...Dot shift circuit, 3...Shift data memory, 4...OR circuit, 5...OR inverting circuit.

Claims (1)

[Scope of Claims] 1. In the inversion printing method of a printer that performs black and white inversion printing by inverting black character print data to obtain white print data, the black character print data is shifted by one dot, and the logic of each data before and after the shift is determined. A reversal printing method for a printer characterized by calculating a sum, inverting the logical sum to create white print data, and performing black and white reversal printing with a wide line width. 2. Inversion of the printer according to claim 1, characterized in that the black character print data is shifted by one dot in the horizontal direction, and the white print data is created by inverting the logical sum of each data before and after the shift. Printing method. 3 In claim 1, black character print data is shifted by one dot in the horizontal direction, each data before and after the shift, and each data by shifting each data by one dot in the vertical direction are obtained, and each of the data is calculated. An inversion printing method for printers characterized by creating white print data by inverting the logical sum of .