JPS5882377A - Print control circuit - Google Patents

Abstract

PURPOSE:To draw a lateral ruled line in the center of print line pitch of optional size by providing one lateral ruled-line character pattern matrix. CONSTITUTION:The size of print line pitch is denoted as P and the height of a lateral ruled-line pattern matrix (MX) is denoted as (q). A character code in lateral ruled-line character pattern which has a storage address (x) in a character pattern memory 4 is outputted from a line buffer 1 to some prescribed position, and the storage address (x) is supplied to a dot transfer circuit 5. A decoding cirlcuit 10 outputs the value of the 2nd counter 12 through a selector 13, and the dot transfer circuit 5 is supplied with an address (p/2+q/2) (=A) in the 1st scan and A-1, A-2 thereafter. The dot transfer circuit 5 sends dot sequences x+A, x+A-1, and x+A-2 in the character pattern stored in the character pattern memory 4 to a printer 6 successively. At this time, when a ruled line is designed to a position at a half height (q) of the Mx, the ruled line is drawn in the center of said (p).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a print control circuit that can draw a horizontal line at the center of a print line pitch of any size in a dot matrix printer.

Conventionally, in order to perform this type of printing, multiple horizontal line character pattern matrices with different positions in the vertical direction were provided, character codes were assigned to each matrix, and character codes were selected and used each time the print line pitch changed. This has been achieved by the following methods.

With these various methods, the capacity of the character pattern memory in which the horizontal line character pattern matrix is stored is large, it is necessary to assign a character code to each horizontal line character pattern matrix, and the printing line pitch may change. The drawback was that a character code had to be selected and used each time.

An object of the present invention is to provide a print control N path that can draw a horizontal line at the center of a print line pitch of any size by simply having one horizontal line character Bakun matrix corresponding to one character code. There is a particular thing.

The present invention scans the line buffer in which the size of the print line pitch and the desired print character code is stored, waiting for a scan pulse generated every time one scan starts from the printer, and converts the line buffer into the print character code. (corresponding character pattern)
A dot matrix method in which a desired dot string is retrieved from the character pattern memory based on the storage address in the character pattern memory stored in the IJ socks and the value of a counter that counts the number of scans, and printing is performed according to that dot string. In the print control circuit of a printer, a character code decoding circuit, a division circuit that can reduce the print line pitch size and the height of the character pattern matrix to 1/2, and l/2
Printing control with an adder that adds 111 for each of the input values, a counter circuit such that the output of the adder is set and then subtracted by a scanning pulse, and a selector controlled by a character code decoding circuit. It is a circuit.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, a line buffer 1 stores in advance a value p indicating the size of the print line pitch and a desired character code to be printed on the print line.

When a scan pulse generated every time one scan is started from the printer 6 is given to the scan control circuit 2, the scan control circuit 2
starts scanning the line buffer 1, and in the first scan, p indicating the size of the print line pitch is stored in the first scanning counter 11, and p/2, which is halved by the first dividing circuit 7, is input to the first scanning counter 11. After setting the output (p/2+q/2) of the adder 9, which increases the sum of q and q/2 obtained by dividing the above q into 1/2 by the second dividing circuit 8, into the second scanning counter 12, the character Causes the code to be scanned.

The address generation circuit 3 supplies the storage address in the character pattern memory 4 of the character pattern matrix corresponding to the character code from the character code obtained by scanning the row buffer 1 to the dot transfer circuit w15. The dot transfer circuit 5 outputs desired dot string information from the character pattern memory 4 from the storage address and the value of the first scan counter 11 or second scan counter 12 given from the selector 13 and sends it to the printer 6. When the transfer of the dot row information in the first scan is completed, the scan control circuit 2 starts scanning the row buffer 1 after decrementing the values of the first scan counter 11 and the second scan counter 12 by w11 every time the scan pulse arrives. By repeating the transfer of the dot row information until the value of the first scanning counter 11 reaches 111, printing on the line whose print line pitch is p is completed.

Under a printing control circuit that causes printing to be performed by the above-described operation, a character code such as a horizontal cross line character pattern and a storage address of the character pattern memory 4 or X is placed at a certain predetermined position. The case where it appears from row buffer l will be explained.

From the above explanation, the dot transfer circuit 5 has the storage address
or given. The character code decoding circuit 10 selects a selector 13 because the character code is a horizontal line character pattern.
Since the dot transfer circuit 5 operates to selectively output the value of the second counter 12 by controlling
2) −1, (p 5− /2+q/2 )−2, etc. are given.

Given the above input information, the dot transfer circuit 5 selects x+(p/2+(1/2),
X+(1)/2+(1/2)-1°x-1-(p/2+
q/2)-2, . . . dot rows are sequentially sent to the printer 6 according to each scan. At this time, if you draw a horizontal line at the position of 1/2 of the IJ x height q as shown in Figure 2, you can see that the line will be drawn at the center of the print line pitch size p. .

From the above, the size p of the print line pitch is arbitrary, and by setting the matrix height q of the horizontal line pattern matrix to the maximum print line pitch that a certain print control circuit can obtain, one horizontal line pitch can be printed. It can be seen that by simply having a pattern matrix, a horizontal line can be drawn at the center of a print line pitch of any size.

If the character code is not a horizontal line character pattern, the character code code circuit 10 causes the selector 13 to select and output the value of the 6-first scanning counter 11, or the printing control at this time is well known. Therefore, the explanation will be omitted.

Note that the first running food counter 11. second scanning counter 12, first and second divider circuits 7 and 8. The adder 9, the character code decoding circuit 10, and the selector 13 can be configured using general logic elements such as a counter circuit, a decoder circuit, and a multiplexer circuit.

From the above explanation, according to the present invention, it is possible to draw a horizontal line at the center of a printing line pitch of any size by just having one horizontal line character pattern matrix, so the capacity of the character pattern memory is minimized. This has the effect of being able to draw horizontal lines with great force if you are conscious of the size of the print line pitch.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing an example of a character pattern matrix in which the height of the matrix having a certain row of dots is q. 1... Row buffer, 2... Scanning control circuit, 3...
... Address generation circuit, 4 ... Character pattern memory, 5 ... Dot transfer circuit, 6 ... Printer, 7 ... First division circuit, 8 ... ...2nd % first = circuit, 9...adder, 10. ...Character code decoding circuit, 11...First scanning counter, 12...Second scanning counter, 13...Selector.

Claims (1)

[Claims] The line buffer in which the size of the print line pitch and the desired print character code are stored is scanned waiting for a pulse that is generated every time one scan starts, and the character pattern corresponding to the print character code is stored. In a dot matrix printer, a desired dot string is retrieved from the character pattern memory based on the storage address in the character pattern memory and the value of a counter that counts the number of scans, and printing is performed according to that dot string. a code memory; at least two divisive first paths; an adder for summing the outputs; a second counter circuit for counting the number of scans after the output of the adder is set; A print control circuit having a selector fril-controlled by a code circuit.