JPS5890967A - Printing system - Google Patents

Abstract

PURPOSE:To enable to print in an orderly manner, by correcting the head position of leading dots in the next zone in accordance with the condition of the change in the number of dot pulses in a zone when said change is not larger than a predetermined value. CONSTITUTION:An outer slit 11-1 of a disk 11 gives a dot timing, while an inner slit 11-2 gives a zone timing per 80 dots in 5 characters. These timings are detected by a sensor 12, dot pulses (b) are fed into a counter 13 and are counted by clearing (c) the counter 13 for each zone pulse (a), and the number of the dots in each zone is recorded on a register 14. The number (n) of the dots in each zone in a normal consition (for example, n=80) is preset on a dot number setting circuit 15, is compared to the contents of the register 14 by a comparator 16, and when the difference exceeds + or -DELTAm, a signal is fed to an alarming circuit 17 to issue an alarm. When the difference is not larger than + or -DELTAm, data on the difference are fed to an address-correcting circuit 18 to correct an address.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a printing device having a head position detection unit 1 which generates a zone pulse which is a scanning verification signal of the head for each of a plurality of dot pulses, in which the number of dot pulses in each zone slightly increases or decreases. (1) This relates to a printing method that prevents the print line from being damaged even when the print line is large (1).

Conventionally, in dot matrix kanji printers, multiple head position detection signals, for example, 5 of 16 dots per character, are used as head position detection signals.
A zone pulse is generated every 80 dots of a character, the number of pulses within this zone is checked, and an alarm is generated if the number of scan errors or excessive dots in head scanning exceeds a predetermined value.

FIGS. 1(a) to 1(d) show a prior art example in which the dot pulses in the normal zone are converted into 5 dots, and the state of missing dots or excessive dots is shown.

In the same figure (a), if each zone has 5 dots during normal operation,
Figures (b) and (,) show the cases where one and two missing dots occur in each zone, respectively, and (d) shows the case where there is one more dot in each zone. In these cases, an alarm is generated only in the case of (c) in the same figure, where two dots are missing, and in the cases of (b) and (d) in the same figure, in which the number of dots in each zone increases or decreases by 91 from the specified value, it is allowed as is. has been done. However, in either case, the dot spacing is equal to (2), and if a dot is missing, the head will not scan, so the characters printed in Figure (b) will have a normal width of 415 in Figure (a). Even if the cap is shortened and does not interfere with discrimination, the length of the line will be shortened. On the other hand, in the same figure (d)
Since the head scans extra, the width is expanded to the normal width 615 in FIG.

In either case, the character string is shifted from the character string in FIG.

The object of the present invention is to provide a printing device having a head position detection signal for emitting zone pulses in a plurality of dot pulses, and to provide a printing method that prevents a character string from being significantly shifted even if the dot pulses of each zone slightly increase or decrease. The goal is to provide the following.

In order to achieve the above object, the printing method of the present invention includes a dot pulse generating means, a zone pulse generating means for generating zone pulses prepared for each predetermined number of the dot pulses, and a dot pulse generating means that performs scanning corresponding to the dot pulses of the dot pulse generating means. A head position detection signal is supplied to the print head to emit a zone pulse every predetermined number of dot pulses, and the scan of the print head is controlled by checking the number of dot pulses for each zone pulse. This printing apparatus is characterized in that when the increase or decrease in the number of dot pulses in a zone is less than a predetermined value, the head position of the first dot in the next zone is corrected in accordance with the condition.

The present invention will be described in detail below with reference to examples.

FIGS. 2(a) to 2(C) are diagrams explaining the principle of the present invention.

Figure 1 (a), Cb), (OJ is shown in Figure 1 (a), respectively.
), (b), and (d) are explained in comparison with the same examples. That is, in Fig. 1, even if the number of dots in each zone increases or decreases by one, it is allowed as is, and as a result, the character string becomes disordered, whereas in the present invention, the number of dots in each zone increases or decreases by one, and as a result, the character string becomes disordered.
For example, when it is detected that one missing dot or one excess dot has occurred in the first zone, the head position is corrected for the first dot in the next zone, as shown in FIG.

That is, in the same figure (b), the number of dots is 1 in the first zone.
When it is detected that a missing dot is detected, one dot is skipped and the scanning position address of the first dot in the second zone is set as ■. In the figure (0), when it is detected that the number of dots is one more in the first scene (4), the scanning position address of the second leading dot is set to the position of ■ again after advancing as ■. By correcting in this manner, even if there is some expansion or contraction in the horizontal direction of the characters, it is possible to prevent accumulation and to make the character strings almost uniform.

FIG. 3 is an explanatory diagram showing the configuration of an embodiment of the present invention.

In the figure, a slit disk 11 is provided in conjunction with a head drive section of a dot printer to provide dot timing in the line direction of characters. That is, the outer slit 11-1 of the disk controls the dot timing, and the inner slit 11-1
1-2 gives zone timing every 5 characters and 80 dots. This timing is detected by the sensor 12, and the dot pulses are put into the counter 13, cleared and counted for each zone pulse, and the number of dots in each zone is recorded in the register 14. The normal number n of dots in each zone, for example 80 dots, is set in the dot number setting circuit 15, and this and the contents of the register 14 are put into the comparator 16 and compared, and the difference (5
) When the minute exceeds ±Δm, a signal is sent to the alarm generation circuit 17 and an alarm is output. When the difference is less than ±Δm, the difference data is sent to the address correction circuit 18, and the data is outputted in FIG.
), perform the correction as explained in (C). That is, when missing dots are detected, the position of the start address of the next zone is corrected by the number of dots, and when excess dots are detected, the position of the next start address is corrected by returning the number of dots. Address counter 19 is normal? 12, the column direction pattern of the dot matrix stored in advance in the pattern memory 20 as pattern data is read out for each dot, and the driver 21 drives each magnet of the head 22).
(M) Driving 22-1 and operating pin 22-2 performs printing.

If the number of dots in the zone increases or decreases by sb and this difference is within the allowable range, the address correction circuit 18 operates and sends the difference value to the address counter 19), and as described above, the state at the time of the zone pulse is The position of the first dot in the next zone (6) is corrected depending on whether there are missing dots or excessive dots.

As explained above, according to the present invention, even if there is a slight increase or decrease in the number of dot pulses in each zone in a printing device that has a position detection signal that generates a zone pulse for each of a plurality of dot pulses, character discrimination is affected. If there is no dot, the position of the first address of the next zone is corrected according to the increase or decrease of dots in the scissor 7 using the method of the present invention. This results in
You can obtain an orderly print array by aligning the strings in each line.

[Brief explanation of drawings]

Figures 1 (,) to (d) are diagrams explaining the problems of the conventional printing method, Figures 2 (a) to (0) are diagrams explaining the principle of the present invention, and Figure 6 is an embodiment of the present invention. 11 is a slit disk, 12 is a sensor, 16 is a counter, 14 is a register, 15 is a dot number setting circuit, 16 is a comparator, 17 is an alarm generation circuit, and 18 is an address. A correction circuit, 19 an address counter, 20 a pattern memory, 21 a driver group, and 22 a head. (7)

Claims (1)

[Claims] It has a dot pulse generating means, a zone pulse generating means for generating a zone pulse prepared at a predetermined time of the dot pulse, and a print head that is scanned in response to the dot pulse of the dot pulse generating means, and generates a zone pulse every predetermined number of dot pulses. In a printing device that supplies the generated head position detection signal to the print head and controls the scanning of the print head by inspecting the number of dot pulses for each zone pulse, when the increase or decrease in the number of dot pulses in a zone is less than a predetermined value, it is detected according to the state. A printing method characterized by correcting the head position of the first dot of the next zone.