JPH02190357A - Serial printer - Google Patents

Abstract

PURPOSE:To raise resolution of an enlarged character by a method wherein other than a character font of a dot matrix of a basic size, the character font of the dot matrix of an enlarged size is established. CONSTITUTION:A control part 1 firstly takes an upper half 24 dot content data out from an enlarged character generator 10 in which the data is stored by a 48X48 matrix, and is developed in an image buffer 8. This dot image is printed by the same way as in printing of a basic size. Then, the control part 1 drives a paper feed motor driver 6 to perform 24 dot paper feed. Further, the control part 1 takes a lower half 24 dot content data out from the enlarged character generator 10, developes in the image buffer 8, and performs printing control in the same way as on the first time. Consequently for the enlarged character with a serial printer high quanlity printing can be performed in two times the resolution.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a serial printer, and particularly to a printing mechanism for enlarged characters.

[Conventional technology]

Conventionally, enlarged printing in this type of serial printer has been performed by performing calculations on a basic size dot matrix character font.

[Problem to be solved by the invention]

The conventional enlarged printing described above is performed by calculations on the basic size dot matrix character font, so even if the characters become larger, only the resolution of the basic size dot matrix can be obtained, and the disadvantage is that the jaggedness of the characters is noticeable. there were.

[Means to solve the problem]

The serial printer of the present invention has a normal dot matrix character font, a dot matrix character font with double the density of the normal character font, and a control unit that prints by switching between the two types of character fonts depending on the size of the character. have.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of an embodiment of the present invention.

In this embodiment, a 24-dot serial printer will be considered.

First, the case of printing characters of the basic size or smaller size will be explained. The control unit 1 has 24 data
Data is extracted from the basic character generator 9 stored in an X24 matrix and sent to the image buffer 8.
Expand to. When printing characters smaller than the basic size, additional logical operations are added. After that, the horizontal feed motor driver 4
While driving, the print head driver 2 is driven to print. This is similar to the operation of a conventional serial printer.

Next, as an example of enlarged size characters, a case will be described in which characters of double height and double width are printed. The control section 1 first extracts data for 24 dots in the upper half from the enlarged character generator 10 in which data is stored in a 48.times.48 matrix, and expands it into the image buffer 8. This dot image is printed in the same way as basic size printing.

Next, the control section 1 drives the paper feed motor driver 6 to feed the paper by 24 dots. Furthermore, the control section 1 extracts data for 24 dots in the lower half from the enlarged character generator 1.theta., develops it in the image buffer 8, and performs the same printing control as the first time.

Figure 2 shows the serial printer of this embodiment that is 2 times tall and 2 times wide.
FIG. 3 is a diagram showing an example of double printing, and FIG. 3 is a diagram showing an example of printing twice vertically and twice horizontally by a conventional serial printer. Comparing the two, it can be seen that the enlarged characters produced by the serial printer of this embodiment are printed with twice the resolution and higher quality.

Furthermore, when performing printing with a size n (vertical) x m (width), the serial printer of the present invention retrieves data from the enlarged character generator and then performs the same logical operations as those performed by conventional serial printers. It is clear that an enlarged character with twice the resolution is obtained.

〔Effect of the invention〕

As described above, the present invention has the effect of increasing the resolution of enlarged characters by providing an enlarged size dot matrix character font in addition to the basic size dot matrix character font.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an image of enlarged characters printed by a serial printer according to an embodiment of the invention, and Fig. 3 is an image of enlarged characters printed by a conventional serial printer. be. 1...Control unit, 2...Print driver, 3...Print head, 4...Transverse feed motor driver, 5...・・Horizontal feed motor, 6・
...Paper feed motor driver, 7...Paper feed motor, 8...Image buffer, 9...
...Basic character generator, 10...
Expanded character generator. Agent: Susumu Uchihara, Patent Attorney No. 1

Claims (1)

[Claims] In a serial printer having a character enlargement function, a basic character font with a predetermined dot matrix size, an enlarged character font with a dot matrix size that is denser than the dot matrix size of the basic character font, and a printed character size A serial printer comprising: a control unit that performs printing by switching between the basic character font and the enlarged character font.