JPS60162676A - Printer accuracy testing device - Google Patents

Abstract

PURPOSE:To enable the presence or absence of a lateral stagger of a printer to be easily checked in a testing step, by providing an external memory storing a font pattern for detecting a positional stagger and a transmitter for transmitting the font pattern to the printer. CONSTITUTION:The printer accuracy testing device comprises an external memory 5 storing a font pattern for general characters and symbols, a special external memory 8 storing a font pattern for testing the stagger of the head, the transmitter 6 for transmitting the font pattern stored in the external memories to the printer, and a controller 7 for controlling the operations of the above components. The controller 7 takes out the special font pattern for detecting the stagger of the head from the special external memory 8, and transmits the pattern through the transmitter 6. The printer decodes by a controller 4 the font pattern received through a receiver 3, and the pattern is printed by controlling a head movement controller 1 and a pin controller 2. By printing the font pattern, the stagger of the head can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an accuracy inspection device for a printer.

[Prior art]

A conventional device of this type was the one shown in FIG. In the figure, (1) is a head control device that controls the left and right movement of the print head, (21 is a pin control device that controls the pins in the head, and (3) is a font pattern sent from +61. The receiving device (4) is il+
, 121, and 131, and the printer is composed of 111, 121, 131, and 141. On the other hand, the printer accuracy inspection device was +51 and +61.

It consists of (7), +51 is an external storage device that stores font patterns such as characters and symbols, and (6) is (5).
(7) is a control device that controls the operations of (51 and (6)).

Next, the operation will be explained. First, the printing principle of the printer will be explained. The printer control device (4) analyzes the font pattern obtained through the receiving device (3),
Based on the results, the head control device 11+ moves the head left and right, and the pin control device -1 is used to strike a pin. In this way, characters and symbols are printed.

In printers with this type of configuration, the head control device (
1) and the pin control device (2), the printing position may deviate from one line to the next.

In order to check this head misalignment, conventionally, a control device (7) retrieves a font pattern for a vertical straight line from an external storage device (51) and transmits the font pattern to a printer via a transmitting device (6). The conventional method was to have the printer print several lines of vertical lines by feeding the paper into the printer, and then check the condition of the printed lines.

As mentioned above, the conventional head misalignment inspection method simply prints a straight line, so the fact that the head is misaligned can be determined by visually observing the distortion of the line. There was a drawback that it was not easy to know how wide the deviation was.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by having the printer to be inspected print several types of positional deviation detection patterns, it is possible to detect the presence or absence of left-right deviation of the head and its deviation. The object of the present invention is to provide an apparatus that can easily and clearly inspect the width of C2.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, (1) is a head control device that controls the left and right movement of the print head, (2) is a pin control device that controls the pins in the head, and (31 is a control device that receives the sent font pattern and controls it. device (41), (4
) is a printer control that controls the operations of 111 , 121 , 131 , and 111 , 121 , 131 ,
+41 constitutes a printer. The printer accuracy inspection device consists of (an external storage device that stores 51 font patterns for general characters and symbols, a special external storage device that stores +81 font patterns for head misalignment inspection,
a transmitting device that sends the font patterns stored in 151 and 181 of 61 to the printer, and 151 and 16 of 61;
1 and 181. The font patterns for head misalignment inspection stored in the special external storage device are shown in FIGS. 3 to 11, and the drawings will be explained below. In Figure 3, there is a 1 dot thick line vertically in the center of the font, and a '0' line slightly below the center.
(However, strictly speaking, the vertical line is not the center of the font (it is the 12th dot from the left.

) The vertical lines in the fonts in FIGS. 4 to 7 are shifted 1 to 4 dots to the left from the vertical lines in the W2B diagram, and the number of dots shifted to the right of the vertical lines is indicated. Figures 938 to 11 are opposite to Figures 4 to 7, with 1 to 1 to the right of Figure 3.
4 dots are off.

Next, its operation will be explained. The control device (7) extracts a special font pattern for detecting head deviation from the special external storage device (8) and sends it to the printer via the transmitting device +61. The printer decodes the font pattern received through the receiving device (7) using the control device (4), and sends the head movement control device (11) and pin control device (21) to the printer.
control to print the pattern.

The principle by which head misalignment can be detected by printing this font pattern will be explained. The pattern in Figure 3 (
Hereinafter, it will be written as ■. (Same for other patterns) has a vertical straight line in the center.If this pattern is printed across two lines at the same character position, if there is no misalignment in the head,
Vertical lines spanning two lines should form a straight line. As a result, the presence or absence of head misalignment can be discovered by examining the straight lines marked ■ and ■ between the upper and lower two lines.

Next, the principle of detecting the width of the deviation when there is a deviation in the head will be explained. If the head misalignment is detected by the above method, then next pattern other than ■ (■~■
) and ■ at the same character position in two lines above and below, and check the condition of the vertical lines. The vertical lines from 0 to 0 are shifted by 1 to 4 dots to the left or right from the ones marked with ■, at intervals of 1 dot.
If the lines of pattern (2) and other patterns match, it means that the head is deviated by the amount of deviation of the vertical line of pattern (2).

An embodiment of this inspection device will be described with reference to the drawings.

jl! FIG. 12 is an example of a printer printing a pattern using this inspection device. +ffi+,
161.

At position (7), the vertical lines of 0 are in a straight line, so
It can be seen that there is no head displacement at this position.

However, in 181, there is a shift in the vertical line of ■comrade, and the vertical line of ■ and 0 are in a straight line. This means that [stock], O
But I can say it. From this, it can be seen that in this printer, there is no head misalignment on the left side of the print area, but there is a one-dot head misalignment on the right side.

As described above, by using this device, it is possible to easily and clearly inspect the presence or absence of head deviation and the width of the deviation.

In the above example, the case of bidirectional printing (printing is performed both when the head is moving to the right and to the left) was investigated, but the case of unidirectional printing was also examined, and the same printer was used. It is also possible to examine the difference in left and right deviations in both directions (9) and in one direction.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily check whether there is left-right misalignment of the head at the printer testing stage.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventionally used printer accuracy inspection device, Fig. 9J2 is a block diagram of an embodiment of the printer accuracy inspection device according to the present invention, and Figs. 3 to U are a block diagram of a special external storage device. FIG. 12 is a diagram showing the stored font pattern for detecting head misalignment. FIG. 12 is a diagram showing a printer printing a font pattern for detecting head misalignment using the present printer accuracy inspection device. In the figure, (11 is a head control device, (2) is a pin control device, (31 is a receiving device, (41 is a printer control device, (5) and (8) are external storage devices, 16 is a transmitting device,
(7) is a control device. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa Figure 3 Figure 41)m Figure 5 Figure 61χ1 Figure 7 Figure 8 Figure 9 Figure 10 Figure 1. LIi 121'

Claims (1)

[Claims] A head movement control circuit that controls the horizontal movement of the print head, a pin control circuit that controls the pins in the head, a font reception circuit that receives the font pattern to be printed, and the operation of each of these circuits. A printer control circuit for controlling the printer head, an external storage device for storing a font pattern for detecting misalignment, and a transmitting device for transmitting the font pattern to the printer, and inspecting the misalignment of the printer head. A printer accuracy inspection device featuring: