JPS63309464A - Printing system of thermal transfer serial printer - Google Patents

Abstract

PURPOSE:To allow no deterioration of printing quality even in a graphic pattern of high printing density by providing a means for thinning each data bit string which directly crosses a digit direction by a prearranged bit interval and transmitting data bits to a printing head driver and a means for transmitting the thinned-off printing data to a printing head driver. CONSTITUTION:While the first single line data is read, an instruction is input so that only odd-numbered bits of each data bit string which directly crosses the digit direction of the first single printing data be selected and transmitted to an odd-numbered bit data buffer 3. In addition, only even-numbered bits of each data bit string which directly crosses the digit direction of the second line printing data are selected and transferred to an even-numbered bit data buffer 4. In this way, a total of two printing actions enable a single line of printing to be performed. Therefore, excess heat accumulation in a printing head can be prevented even when a high density graphic pattern is printed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a printing method for a thermal transfer serial printer, and more particularly to a printing method for a serial printer that can improve print quality.

BACKGROUND TECHNOLOGY Conventionally, thermal transfer serial printers are equipped with a print image memory that stores print data for one line of print, and print data is sequentially read from this memory and sent to the print head driver to print. There is.

Therefore, when printing a graphic pattern with a high print head density, there is a drawback that heat accumulation in the print head increases, which deteriorates the ink melting conditions of the ink ribbon, and as a result, the print quality deteriorates.

Purpose of the Invention Therefore, the present invention has been made to eliminate such drawbacks of the conventional ones, and its purpose is to prevent the print quality from deteriorating even if the print density is old. The purpose of the present invention is to provide a printing method for a thermal transfer serial printer.

Structure of the Invention The printing method of the thermal transfer serial printer according to the present invention is as follows:
A print image memory that stores one line of print data,
In response to a high-quality printing instruction, for the one line of print data from the memory, each of the Y-tabit strings perpendicular to the digit direction is thinned out at predetermined bit intervals and sent to the print head driver; The present invention is characterized in that a means for sending the thinned out print data to the print head driver is provided, and the print data for one line is printed in a plurality of line printing operations.

Example Hereinafter, the present invention will be described in detail with reference to the drawings.

The figure is a block diagram of an embodiment of the invention. In the figure,
The print image memory 1 stores a print dot image for one line, and the print control unit 2 reads the print data from the print image memory 1 and stores it in the odd bit data buffer 3 and the even bit data buffer 3. Send to 4. The print data from both data buffers 3 and 4 is sent to a print head driver 5 and led to a print head (not shown).

The print quality instruction section 6 instructs switching between normal print mode and high print quality mode. In the high print quality mode, the print control section 2 is instructed to read the same line of print data twice in succession, and during the first one-line print data readout, the first Can you create an odd bit data buffer by selecting only the odd bits in each data bit string orthogonal to the digit direction of the row print data? Instruct to send to 3. Also, only the even numbered bits in each data bit string orthogonal to the digit direction of the second row print data are selected and sent to the even numbered bit data buffer 4.

In such a configuration, when the print quality instruction 8116 sets the high print quality mode, the print control unit 2 selects only the odd numbered bits of the one line of print data read from the MET1 and stores the odd numbered bit data buffer 3. send to The print head driver 5 prints only odd numbered bits of one line of print data. This operation is performed from the first address to the last address in print image memory 1.

In response, the print control section 2 again sequentially reads out the print data on the same line from the first address to the last address in the memory 1, but this time it selects only the even bits and sends them to the even pit data buffer 4. . Therefore, only even-numbered bit data of one line of print data is sequentially supplied to the print head driver 5 and printed.

In this way, in the first printing operation, the even numbered bits are thinned out and printed, and in the second printing operation, the thinned out even numbered bits are successively printed, and one line is printed in a total of two printing operations. Therefore, even with a high-density graphic pattern, it is possible to prevent a large amount of heat from accumulating in the print head.

In addition, in the normal print mode, the print control unit 2 simultaneously transfers the odd bits and even bits of one line of print data to the odd bit data buffer 3 and the even bit data buffer 3. 4
The outputs of the data buffers 3 and 4 are stored in the print head driver 5, respectively. Therefore, one line can be printed in one line printing operation.

It is clear that the manner in which bits of one line of print data are thinned out is not limited to the above embodiment, and that various modifications can be made.

Effects of the Invention As described above, according to the present invention, one line of print data is thinned out at predetermined bit intervals and printed, and one line of printing is performed by multiple printing operations. This has the effect of clearly printing high-density graphics.

[Brief explanation of drawings]

The figure is a block diagram of an embodiment of the invention. Explanation of symbols of main parts 1...Print image memory 2...Print control section 3.4... Data buffer 5...Print head driver 6...Print quality instruction section

Claims (1)

[Claims] A print image memory that stores one line of print data,
means for thinning out each of the data bit strings perpendicular to the digit direction at predetermined bit intervals from the one line of print data from the memory in response to a high-quality printing instruction; A printing method for a thermal transfer serial printer, characterized in that the printing method includes means for sending data to the print head driver, and the print data for one line is printed in a plurality of line printing operations.