JPS59202880A - Printing control by plural printing controllers - Google Patents

Abstract

PURPOSE:To expand the degree of freedom of the printing position to the line direction and facilitate the high speed output by a method wherein printing data of one page, compiled by each line, or printing data of one line, complied with figure letters and control letters, are printed by a plurality of printing controller. CONSTITUTION:Printing data are compiled in a printing apparatus, in which the printing osition to the line direction is controlled by a forms control buffer, by separating fractional formulae into three lines n-1, n and n+1. Wi means a shifting pitch of the line and lj means the size of a letter. The number of lines and the shifting pitch of each line are loaded into the forms control buffer 3 previously from CPU and memorized. The printing data, compiled for each line and transmitted from CPU, are put into an input buffer 1 and subjected to the process such as CG address conversion from the letter codes by a compiling processor and memorized in a page buffer 4. When the data for one page are stored, the printing data are read out by each line from the page buffer by a read-out part 5 and transmitted to a printing controller and converted into dot patterns by CG10 and transmitted to PR and the printing operation is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a printing device using a laser beam. The present invention relates to a print control method suitable for expanding the degree of freedom of print position in the row direction.

[Background of the invention]

One of the methods for controlling the position of printed characters in the line direction with a laser beam printing device is to use a forms control buffer (commonly known as PCB). In this method, the width and length of the line are set in consideration of the maximum character size to be printed in the line, so that data that has been edited in advance line by line can be printed at high speed in the lath method from the beginning of the page. A problem arises in which the function is restricted so that the rectangular printable area determined by does not overlap between adjacent lines. There is a method of using negative memory to remove this restriction, but the printing performance is greatly reduced.

[Purpose of the invention]

An object of the present invention is to expand the degree of freedom in the printing position of characters in the line direction under the following conditions.

(2) The printing position in the line direction is controlled by the forms control buffer, leaving a program interface suitable for printing data in form format.

(2) No page memory is provided in the device, thus reducing the reduction in print performance. However, the degree of freedom in printing position is less than in the method using page memory.

[Summary of the invention]

In a raster type printing device, generally, as a character is printed, the paper is fed by the size of the character or larger, and the amount of paper feed, that is, the degree of freedom of the printing position in the line direction, depends on the size of the printed character. subject to restrictions. This restriction is particularly severe when paper is fed page by page and in one direction, such as in the case of a laser beam method.

In order to print with a paper feed that is smaller than the apparent size of the characters to be printed, it is necessary to solve the problem of simultaneously printing multiple lines with overlapping print areas.

[Embodiments of the invention]

FIG. 1 shows an example of data printed according to an embodiment of the present invention. In a printing device that controls the print position in the line direction using a forms control buffer, it is more natural to divide the fractional formula shown in Figure M1 into three lines (), ■, and O, and collect print data + m sets. Here, Δ represents a space character, and the Roman letters and symbols represent the codes of the corresponding characters.

Next, the positional relationship in the state actually printed on the paper is
As shown in the figure. Here, Wi represents the line feed pitch f, and lj represents the character size. The printing area of the line ① overlaps with the printing area of the preliminary line C) and ②.

An embodiment of the invention is shown in FIG. This example is composed of two print control units, and is based on the premise that the print areas overlap within the range of adjacent lines.

By increasing the number of print control units, the restriction on overlapping print areas is lifted.

The operation of print control will be explained below. The number of lines printed on one page and the feed pitch of each line are determined by the forms control buffer 3.
is loaded and stored in advance by the CPU.

The print data edited line by line and sent from the CPU enters the input buffer, and the editing processing unit converts the character code to C.
G is subjected to processing such as address conversion and stored in the page buffer 4.

, In order to control the print position in the line direction during this editing process, W is written for each line based on the information in the forms control buffer.
n = Wn -4-Wn -1 (referred to as line information) and Ln = Wn -In (referred to as character information) for each character.
is stored in line with the page buffer.

When one page's worth of data is stored, the print data is read line by line from the negative buffer by the reading unit 5 and sent to the print control unit, where it is converted into a dot pattern by the CGIO and sent to the PH for printing.

The print control section has two control sections having the same dual functions,
line buffers 6 and 11, character counters 7 and 12, respectively;
It consists of row counters 8 and 13 and don't buffers 9 and 14, and the operation of one control section is the same as the normal operation.

The print data read from the page buffer is sent to switch 1.
5, the line buffers are alternately processed by the two print control units simultaneously and in synchronization with each other, and the data is ORed by the 0-ordin circuit 16 and sent to the PR.

In this case, by controlling the line information, printing processing starts from the end of printing of the two previous lines, and overlapping printing with adjacent lines becomes possible.

〔Effect of the invention〕

As explained above, according to the present invention, in a raster printing apparatus using a forms control buffer, the degree of freedom in printing position in the line direction can be expanded and printing speed can be increased compared to a method using page memory. It is possible.

[Brief explanation of the drawing]

FIG. 1 is a display diagram of data to be printed using an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the print position relationship of lines when the first print data is printed on paper. FIG. 3 shows the factor a of the embodiment of the present invention. 3... Forms control buffer 4... Page buffer 6, 7... Line buffer 7
．． 12...Character counter 8.13...Line counter 9.14...Dot hash sofa 15...Switch circuit 16...OR circuit

Claims (1)

[Claims] 1. One page of print data edited line by line, or
A print control method characterized in that one line of print data edited by graphic characters and control characters is printed by a plurality of print control units.