JPS62253477A - Line feed controlling system for serial printer - Google Patents

Abstract

PURPOSE:To prevent a gap between images from being generated when printing a vertically enlarged character or figure through a plurality of line feeds and enable high-quality printing, by feeding a paper by an amount equal to the sum of a standard line feed quantity and a correction line feed quantity when a combined line feeding is designated at the time of line feeding. CONSTITUTION:When a combined line feeding is required for a vertically enlarged character or figure (e.g., graph) contained in date inputted from a host device and stored in a RAM, a printing-controlling and combined line feed detecting part 21 detects the requirement. This information is sent to a line feed controlling part 22, a correction value designated by a line feed correction switch 7 is read, a calculating part 22a modifies a line feed quantity to a line feed quantity increased by the correction value, and the correction value is accumulated in a line feed correction accumulating counter 23. The corrected line feed quantity is sent from the line feed controlling part to a driver 9, and the driver 9 is driven to operate a line-feed motor 10.

Description

[Detailed Description of the Invention] [Summary] The present invention provides means for correcting the amount of line breaks in order to prevent gaps from occurring between line breaks when connecting adjacent lines to print predetermined characters or figures. This improves printing quality by eliminating gaps between line breaks.

[Industrial application field]

The present invention relates to improvements in line feed control for serial printers.

[Conventional technology]

Conventionally, characters or graphics are printed using a serial printer that uses a print head that has printing elements with multiple dots in the vertical direction (for example, 24 dots), and characters or graphics that are longer in the vertical direction than the multiple dots at the bottom are printed by line breaks. connection,
It may be printed in multiple batches. For example, in the first printing of a character and 9 figures that require 2N dots in the vertical direction, after printing the upper half N dots, a line feed for N dots is performed, and the lower half N dots are printed on the next line.

[Problem that the invention seeks to solve]

When the above-mentioned line feed connection printing method is applied, the dot spacing of the head is highly accurate and the error is extremely small, but the line feed error is about K99 and CL1-.

If this rounding is performed in multiple prints, the result will be 9 gaps where the next line is printed overlappingly. There is no problem when printing overlaps, but when a gap occurs, the print quality is significantly reduced.

FIG. 4 is an explanatory diagram of the characters on this shield, and shows an example in which a gap α occurs when printing double-height enlarged characters.

After printing the upper half of the characters, a line break is performed and the lower half is printed.If the line break error is ±11m, the gap is at most 0.211m, that is, the top half is shifted up by CL1■, and the bottom half is This is a case where the half is shifted downward by 01M.

In the past, various proposals have been made to prevent this gap, but most of these have been improvements related to the character generator (CG) in the printer when printing vertically enlarged characters, and improvements from the host device. This method could not be applied when receiving and printing image data.

SUMMARY OF THE INVENTION An object of the present invention is to provide a line feed control method for a serial printer that prevents gaps from occurring at the line feed connections when a plurality of line feeds are connected to print a predetermined character or figure.

[Means for solving problems]

In order to achieve the above object, the present invention provides a serial printer in which a print head having a plurality of printing elements in the vertical direction performs printing while moving in the digit direction, and feeds the printing paper by a predetermined number of lines. a detection means for detecting a line feed, a means for setting a corrected line feed amount, and a line feed control unit including a calculation unit that adds the set correction amount to a standard line feed amount when a connecting line feed is instructed. The present invention is characterized in that when a connecting line feed is instructed, the printing paper is line fed by the amount of line feed obtained from the arithmetic unit.

[For production]

When a connecting line feed is instructed at the time of a line feed, the gap α is eliminated by adding the corrected line feed amount set from the standard line feed amount to the line feed. In this case, there is no problem even if the print is slightly distorted.

If so, by subtracting the previous correction amount and starting a line feed, the standard line break amount from then on is 1! j,' can be set accurately.

〔Example〕

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

In the figure, image data applied to the print head of a serial printer is input from a host processor via an input/output port 1 to a serial printer device under the control of a microprocessor (MPU) 20.

That is, through the data bus of the MPU 2, there is a memory (ROM) 6 that stores the initial program, and a memo that temporarily stores input/output data! J (RAM) 4 and a character generator (OG) 5 corresponding to normal character codes. In addition, the correction amount preset to the line feed correction switch 7, which is a main part of the present invention, is input from the input port through the input/output bus, and the correction amount is added to the standard line feed amount under the control of the MPU 2. is set as a new line feed amount, is sent from the output boat 8 to the driver 9, and the line feed motor 10 is operated to perform a line feed.

゛Also, to set the print head carrier in the specified position,
The position information is sent from the output boat 11 to the driver 12) and the space motor 13 is operated. Furthermore, in order to perform a printing operation at this position, printing information is sent to the driver 15 via the output port 14, and a pin of the printing head 16 is operated.

FIG. 2 is a detailed explanatory diagram of the main part of the embodiment shown in FIG. 1, which is related to line feed correction.

As an example, the print head has 24 dots in the vertical direction, and the dot pitch is 1/160 inch = t1159.
-a (total dot length 3.816 m). On the other hand, the minimum line feed pitch used is 1h40 inches=α106−.

Therefore, when printing vertically enlarged characters or figures, 1
The line feed for the second line is 260 inches (3
, 816 m), but as mentioned above, an error of about 12 cm at maximum occurs. This error varies depending on the type of paper, mechanism, and aging of the mechanism, and gaps may occur due to this error.

In order to correct this gap, the line feed correction switch 7 shown in Fig. 1 is used to set, for example, two correction values ■ and ■ from 0 to 3 pitches to give the line feed correction amount. be.

The line feed control section 22 including the print control number and connection line feed detection section 21 and calculation section 22a shown in FIG. 2 is a block of extracted line feed related functions included in MPUZ. The calculation unit 22α adds or subtracts the set correction amount from the standard line feed amount. Furthermore, it includes a line feed correction cumulative counter 26, which will be described later.

That is, the print control and connection line feed detection unit 21 detects when a connection line feed is required for vertically enlarged characters or figures such as graphs among data input from the host device and stored in the RAM. Send this information to the line feed control unit 22, read the correction value (0 to 6) specified by ■ and ■ of the line feed correction switch 7, and change this line feed to a larger line feed amount by the correction constant by the calculation unit 22α. At the same time, this correction value is accumulated in the line feed correction accumulation counter 23. This cumulative value is referenced to set it at the normal specified position at the end of vertically enlarged characters or figures and at the next line break.

The corrected line feed amount is sent from the line feed control unit 22 to the driver 9, which is driven to operate the line feed motor 10.

FIG. 3 is a flowchart showing the operation of the main part of the embodiment of FIG.

As shown in the figure, the conditions that lead to a connecting line feed are that the line has been printed, that a line has been printed after printing, and that the line feed pitch is 36 pitches or less; otherwise, there is no connecting line feed. Then, the correction is continued during the connecting line feed, and if it is not a connecting line feed, the amount accumulated in the counter 23 is subtracted by the specified line feed pitch, and after performing the line feed operation, the counter 23 is cleared and the process ends.

〔Effect of the invention〕

As explained above, according to the present invention, when printing a predetermined character or figure by connecting lines, a means for correcting the amount of line feed is provided so that no gap occurs between the lines, and furthermore, the correction amount is corrected. A line feed correction cumulative counter is provided. This allows you to set the next line break after the end of these characters or figures at the specified line feed position without leaving any gaps when printing vertically enlarged characters or figures with multiple line breaks. This makes it possible to print with good quality overall.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of the embodiment of the present invention, Fig. 2 is a detailed explanatory diagram of the main part of the embodiment, and Fig. 3 is a flowchart showing the main part of the embodiment. This is an explanatory diagram of the problem. In the diagram, 2 is a microprocessor (MPU) and 5 is a mesosu (
ROM), 4 is memory (RAM), 5 is character generator (O
G), 7 is a line feed correction switch, 9.12.15 is a driver, 10 is a line feed sweater, 13 is a space motor, 16
is a print head, 21 is a print control and connection line feed detection unit,
22 is a line feed control unit, and 26 is a line feed correction cumulative counter.

Claims (2)

[Claims] (1) In a serial printer in which a print head having a plurality of printing elements in the vertical direction performs printing while moving in the digit direction, and the printing paper is line-feeded by a predetermined amount, a detection means (21) for detecting a connection line feed instruction; means (7) for setting a corrected line feed amount; and a calculation unit (22) for adding the set correction amount to the standard line feed amount when a connecting line feed is instructed.
A line feed control method for a serial printer, comprising: a line feed control unit (22) including a line feed control unit (22), and when a connecting line feed is instructed, a line feed is performed on printing paper by the amount of line feed obtained from the calculation unit. (2) Means for cumulatively counting the corrected line feed amount set each time a connecting line feed is performed when the connecting line feeds are repeated (23)
), and an arithmetic unit (22a) that subtracts the line feed amount counted by the cumulative counting means from the standard line feed amount when a standard line feed is instructed after consecutive connecting line feeds. A line feed control method in a serial printer according to claim (1).