JPS6364762A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To improve printing quality by reversing a printing sequence of deflection stages in the first and second rows of nozzles and subsequently compensating for a printing gradient. CONSTITUTION:Nozzle rows 5a, 5b and recording paper 9 form an angle theta, and the paper is fed into an arrow direction at V speed. Ink ejected from each nozzle of a nozzle plate 1, is ejected into a B-B direction at right angles with a line A-A of a nozzle row direction, and then is deflected into a plurality of stages (n stages) by means of an ordinary nozzle. Thus recording paper is printed with this deflected ink particles, that is, printing is performed in the sequential order of stages 1, 2...n of the nozzle row 5a, while it is performed in that of stages n, n-1...2, 1 of the nozzle row 5b. Therefore, the tracks of dots generated by two nozzle rows 5a, 5b are in parallel, and straight lines of an angle which should otherwise be anticipated can be obtained, if it is adequately adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a charge deflection type inkjet recording device, more specifically, a so-called dual-type multi-nozzle charge deflection type inkjet having a plurality of nozzle rows each consisting of a plurality of nozzles. It relates to a recording device.

means for creating a first plurality of inkjet streams in a line oblique to the direction of movement of the recording paper; a plurality of nozzles; and movement of the recording paper from the first plurality of inkjet streams. A so-called dual-type multi-nozzle charge deflection type inkjet recording apparatus having means for producing a plurality of second inkjet streams displaced a predetermined distance in a certain direction, that is, a plurality of nozzles, is disclosed in, for example, Japanese Patent Laid-Open No. 52-1527.
Although it is already known as disclosed in Publication No. 23,
The dual-type inkjet recording device disclosed in the above-mentioned publication uses the first row of nozzles and the second row of nozzles to eject inkjet streams in opposite directions. There was no mention of the above, and there was a fear that the prints printed by both inkjet streams would not necessarily be straight lines, resulting in poor print quality.

Purpose The present invention was made in view of the above-mentioned circumstances.
Particularly, in a dual-type multi-nozzle inkjet recording apparatus, the purpose of this invention is to improve print quality by correcting the inclination of printing.

Structure In order to achieve the above object, the present invention has a first plurality of nozzles on a first line oblique to the moving direction of the recording paper, and a line of the plurality of nozzle rows. A second plurality of nozzles are disposed on a second line displaced in the moving direction of the recording paper, and ink droplets are continuously ejected from these nozzles, and the ink droplets are injected with recorded information. In a dual-type multi-nozzle inkjet recording device that performs recording by selectively applying multiple types of charges according to the amount of charge and deflecting them according to the amount of charge, the first nozzle row, the second nozzle row, This is characterized in that the printing order for the deflection stage is reversed. Hereinafter, the present invention will be explained based on examples.

FIG. 1 is a cross-sectional configuration diagram of essential parts showing an example of a dual type inkjet head in an inkjet recording apparatus according to the present invention. In FIG. 1, 1 is a nozzle plate, 2a,
2b is an independent ink liquid chamber, 3 is a vibrator, and 4 is a material for transmitting pressure from the vibrator to the ink in the ink liquid chamber, for example, RTV rubber is used.

FIG. 2 is a front view of the nozzle plate 1, and the nozzle plate 1 includes, for example, two nozzle rows 5a as shown in the figure.
, 5b are provided.

FIG. 3 is a configuration diagram of main parts of an inkjet recording apparatus according to the present invention, in which 6 is a charging electrode, 7 is a deflection electrode, 8 is a gutter, 9 is a recording paper, and 10a and 10b are nozzle arrays 5a and 5b, respectively. A voltage is applied to the deflection electrode 7 so that the ink droplets 10a and 10b are deflected in opposite directions. Note that FIG. 4 shows an example of the configuration of the charging electrode 6.

FIG. 5 is a diagram showing the relative relationship between the nozzle rows 5a, 5b and the recording paper 9. The angle between each nozzle row 5a, 5b and the recording paper 9 is 0 (
For example, the recording paper forms a V (for example, 45°) in the direction of the arrow.
The paper is fed at a speed of mm/5ee). The ink ejected from each nozzle of the nozzle plate 1 is ejected in the B-B direction perpendicular to the line A-A in the nozzle row direction, but since it is not desired to increase the number of nozzles, one nozzle is usually used in multiple stages. (n stages) and print on the recording paper 9.

However, at this time, printing is performed while feeding the paper, so
Since the recording paper moves for a time difference between the first stage and the nth stage when it hits the recording paper, the nozzle array 5a.

When printing is performed in the order of the upper row, the second row, etc., and the nth row of 5b, the image will not be a straight line as shown by c-c' in FIG. 6, but will be a line D-D'. This results in a broken line as shown, and the deviation Δy from the normal position of the highest stage is about 1 dot pitch. If the nozzle row is in one row, to solve this problem, the angle θ between the head and the recording paper can be set smaller than the ideal θ (for example, when the effective frequency is 15 K)
Hz, don't pitch 85 μm, number of deflection stages n; 89, assuming the original angle is 45°, set θ = 41.8°). However, if there are two nozzle rows, this method cannot solve the problem. Therefore, in the present invention, the nozzles of the nozzle row 5a print in the order of 1st, 2nd, etc., nth row, and the nozzles of the nozzle row 5b print in the order of 1st, 2nd, etc. The nozzle prints in n stages, n-1 stages, ... 2 stages, 1 stage, and in this way, the image obtained will be as shown in Figure 7, and the print from the 2nd row of 5a and 5b will be printed. The loci of the dots become parallel, and by changing the set angle as described above, a straight line at the desired angle can be obtained.

FIG. 8 is a diagram showing a time chart of the charging level when printing a solid area.
The ink droplets ejected from the nozzles of the nozzle row 5b are (b)
When charged in the order and charging voltage shown in the figure, printing as shown in FIG. 7 can be performed.

Hiro-Ichira As is clear from the above explanation, according to the present invention, the first
Since the ink droplets ejected from the nozzles in the row and the ink droplets ejected from the nozzles in the second row are printed on the same straight line, high-quality printing can be performed.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts showing an example of an inkjet head used in carrying out the present invention, FIG. 2 is a front view of a nozzle plate, and FIG. 3 is a configuration diagram of essential parts of an inkjet recording apparatus. FIG. 4 is a diagram showing an example of a charging electrode, FIG. 5 is a diagram showing the relative relationship between the recording paper and the nozzle head, FIG. 6 is a diagram for explaining printing by the conventional technique, and FIG. 7 is a diagram showing the relative relationship between the recording paper and the nozzle head. ,
FIG. 8, which is a diagram for explaining printing according to the present invention, is a diagram showing a time chart of charge levels for performing printing according to the present invention. 1... Nozzle plate, 2a, 2b... Ink liquid chamber. 3... Vibrator, 4... Rubber member, 5a, 5b...
nozzle row, 6... charging electrode, 7... deflection electrode, 8...
... Gutter, 9... Recording paper, loa, 10b... Ink droplets. Figure 6 C2, Figure 8

Claims (2)

[Claims] (1) A first plurality of nozzles are provided on a first line diagonal to the moving direction of the recording paper, and a certain distance from the line of the plurality of nozzle rows in the moving direction of the recording paper. a second plurality of nozzles on the displaced second line, the nozzles continuously ejecting ink droplets;
In a dual-type multi-nozzle inkjet recording device that selectively applies multiple types of charges to the ink droplets according to recording information and performs recording by deflecting them according to the amount of the charges,
A dual-type multi-nozzle inkjet recording apparatus characterized in that the printing order for the deflection stage is reversed between the first nozzle row and the second nozzle row. (2), Angle θ_1 between the nozzle row and the horizontal direction of the recording paper
The relationship between the angle θ_2 that should originally be formed between the straight line printed by one nozzle and the horizontal direction of the recording paper is θ_1<θ_
2. The dual-type multi-nozzle inkjet recording apparatus according to claim 1, wherein the angle between the nozzle array and the horizontal direction of the recording paper is set to be 2.