JPS62177622A - Print control system for printer - Google Patents

Abstract

PURPOSE:To obtain a printed matter with satisfactory print quality and with no gap produced between print lines even in case the graphic print is carried out by a serial printer, by printing a part of the continuous memory data successively and duplicatively. CONSTITUTION:The print data are received from a host device and stored in the 1st memory 5. Then the data are outputted to a head I/O 8 after a print action timer 3 is started and printed by an amount equal to a single line by a print head 4 via a driver 9. When the next print data is stored in the 2nd memory 6, a print form is fed by 7 bits by both signals CR and LF to stop the timer 3. Then 1 is added to a line counter and it is checked whether the line counter is set at 9 or not. If not, the timer 3 is started. The print data of the memory 5 printed in the preceding time is read out by a single byte and stored in the 1st register in a CPU 1. While the print data of the memory 6 in the same address as the memory 5 is stored in the 2nd register of the CPU 1. Then both registers are shifted right simultaneously by an amount equal to the count value of the line counter. The contents of a register 2 are supplied to the head 4 via the head I/O 8 and the driver 9.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a graphic printing control method for a serial printer, and particularly to a printer printing control method for controlling data for printing line by line of printed graphics. be.

(Prior art) Graphic printing with conventional serial printers prints sequentially line by line, so the print data of the reading head that reads the original is sequentially applied to the print head in its original form for printing. Ta.

(Problems to be Solved by the Invention) In the conventional graphic printing described above, when paper is fed by the printer, the amount of paper fed varies due to variations in machine precision, resulting in gaps between printing every nine lines, which deteriorates printing quality. There was a problem in that it decreased.

(Means for solving problems) The present invention has been made in view of the above problems.

Three memories record print information line by line.

The three memories (two registers for moving the data in the lower row of each memory of the recorded print information to the upper row of the next memory, and means for applying the data moved to the registers to the print head) The present invention proposes a serial printing control system that prints data in units of nine lines, and that sequentially prints a portion of the data in the continuous memory in duplicate.

(Function) In the present invention, print data read line by line is sequentially stored in a memory, and after printing the data recorded in this memory, the amount of paper feed is made smaller than the number of dots of the print head, and the printed data is Desired number of dots at the bottom of the row's memory (
The data (usually 1 to 2 dots) is shifted to the upper side of the next stage memory, and the shifted number of dots is printed twice.

(Example) An example of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an electrical block diagram explaining the present invention,
Each device is controlled by 0PU1, but timer 3
interrupts the CPU 1 periodically to notify the timing of printing. The CPU 1 controls energizing signals to the print head 4 and drive signals to the carriage motor M1 and paper motor M2 by interrupting the timer 3 of the CPU. First memory5. 2nd memory 6, 67th memory 7
is the print buffer.

Print data sent from a host (not shown) via the printer interface 2 is sequentially stored line by line.

Each note of this! The print data stored in J5, 6.7 is sent to the head driver 9 via the head I10 port 8 to energize a desired dot on the print head 4. This print head 4 may be of any type as long as it has 8 vertical dots, but in this embodiment, it will be explained that it is a thermal type and the printing paper is thermal paper. The carriage motor M1 is controlled from the motor I10 port 10 via the motor driver 11, and the paper feed motor M2 is controlled from the motor I10 port 12 via the motor driver 13.

Next, the actual operation will be explained with reference to the flowcharts shown in FIGS. 4 to 7. First, clear the value of the line counter indicating the line being printed (81).

The printing condition is set to the first line at the beginning. Next, the first memory 5. Clear the second memory 6 and third memory 7 (S2
). Here, it is checked whether print data is being sent from a host (not shown) via the printer 102 (S3).

If print data has not been sent from the host, wait until print data arrives from the host, and when print data arrives, record it one byte at a time in the first memory 5 (S4). This one
When all the data is recorded byte by byte at each address of the first memory 5 or if there is an end signal (SS), the print operation start timer 3 is activated.
(S6). First memory5. The data storage status of the second memory 6 and third memory 7 will be explained with reference to FIG. Each memory 5, 6.7 is DO~D from address 0 to address n.
Store 8 pits of 7. Here, the data at address 0 of the first memory 5 is applied to the read head I10 boat 8,
Data is applied to the print head 4 via the head driver 9 (S7). Here, it is determined whether or not there is print data from the host (s s )L. If there is data, it is sequentially stored in the second memory 6 starting from address 0 (S9). It is determined whether there is no print data from the host, and if there is, whether the value of the line counter is 0 when stored in the second memory B (S10). If the value of the line counter is 0, it is determined whether all the print data stored in the first memory 5 has been printed (S11), and if the printing has not been completed, the process returns to step 7 to continue printing. . When it is detected in this step 11 that printing for one line has been completed, the print head 4
Detecting whether the printing operation has stopped (812) 1. ,
If it has not stopped, stop printing operation timer 3 (81
3) Check whether the print data is stored in the memory next to the memory where printing has finished (in this case, the second memory 6) (S14) L. If the print data is not stored, operate. end. In step 14, the second
If the print data is stored in memory B, apply the carriage return signal C to the carriage motor M1 to return the carriage, and apply the line feed signal LP to the paper feed motor M2 to advance the printing paper by 7 bits. (
815). Next, it is determined whether the storage of the print data in the second memory 6 has been completed (816). If the storage has not been completed, the process returns to step 8. When the data has been stored in the second memory 6, it is checked whether the CR multiplier signal to the carriage motor M1 and the LP multiplier signal to the paper feed motor M2 have been applied (817)L.

Once confirmed, the operation of timer 3 is stopped (818).

Next, add 1 to the row counter value (1 in this case) (81
9), determine whether the value of the row counter is 9 (S 20 )
l., If the value of the line counter is not 9, start the printing operation timer 6 (S21) and store the memory (first
Read 1 byte of the print data from the memory 5) and store it in the register 14 in the CPU i (822), and read the print data at the same location in the first memory 5 of the second memory 6 into the second register 15 in the CPU [Ji]. Store. (S23) (Figure a
Reference) Here, the value of the row counter (1 in this case) is
One byte of memory 5 is shifted to second memory 6 in the direction of the arrow (824).

(See Figure 6) The print data in the second register 15, which stores this shifted print data, is transferred to the head ef 0 port 8. The voltage is applied to the print head 4 via the head driver 9 to print (825).

When one byte worth of print data is printed here, the process returns to step 8 and repeats the above-described operation.

If the value of the row counter is 9 in step 20 of FIG.
That is, since the number of shifts of data in the memory has been completed for 8 bits, the printing operation timer 3 is activated from the terminal (2) in FIG. 6 (826).

Set the value of the line counter to 1 (827), read out 1 byte of the print data in the memory where the previous printing was completed (in this case, the first memory 5), store it in the register 14 in the 0PUI, The print data at the same location in the first memory 5 of the second memory 6 is stored in the second register 15 of the CPU 1. (See Figure a) (828, 829) Here, the value of the 2-line counter (here 1) is 1 in the first memory 5.
The bytes are shifted to the second memory 6 (850). (Refer to Figure 6) The print data in the second register 15, which stores this shifted print data, is transferred to the head ■10 port 8.
It is applied to the printing hect 4 via the head driver 9 to print. (831) Check whether all the print data stored in the second memory B has been printed (832). If printing of one line has not been completed, return to step 28, and in this step 32 print data for one line. When it is confirmed that printing has been completed, the process returns to step 13 in FIG. Next step 7.25.
The printing operation 31 is processed by calling the interrupt processing routine shown in FIG.

(Effects of the Invention) Since the present invention has the above-described configuration, even when printing graphics such as photographs and graphs using a serial printer, there is no gap between printed lines and printed matter with good quality can be obtained. It is.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an electrical block diagram of a printing device to which the present invention is applied, FIG. 2 is an explanatory diagram of a memory, FIG. 5 is an explanatory diagram of expanded registers, and FIG. , 5th
6 and 7 are flowcharts. 1...CPU, 2...Printer I10
゜6...Printing operation timer, 4...
print head. 5.6.7...Memory, Ml...
- Carriage motor, M2...Paper feed motor.

Claims (1)

[Claims] three memories that record print information line by line; two registers that move the data in the lower row of each memory of the print information recorded in the three memories to the upper row of the next memory;
A printing control method for a serial printer that prints line by line, the device having a means for applying data moved to the register to a print head, and printing part of the data in the continuous memory sequentially and repeatedly. Features printer print control method.