JPS6011362A - Ink jet recording apparatus - Google Patents

Abstract

PURPOSE:To simply perform the adjustment of the titled recording apparatus, by attaching a recording head fixing plate to a head carriage so as to make the same movable to a direction at right angles to the scanning direction of the recording head by piercing an adjusting bolt having a slidable taper. CONSTITUTION:When a bolt 8 is rotated to an A'-direction, said bolt 8 moves to a C'-direction to rise along the taper formed to the lower side thereof and, therefore, a recording head 1 is rotated to a direction shown by the arrow B' around a shaft 6. As a result, the angle formed by the nozzle line of the recording head 1 and a scanning direction changes and the nozzle intervals in the scanning direction and a right angle direction are adjusted. The rotary head of this recording head 1 is fixed to a recording head fixing plate 7. The recording head fixing plate 7 is attached so as to be movable in an up-and-down direction in a guide 11 and minutely moves in the up-and-down direction by the rotation of a bolt 13. Therefore, the recording head 1 moves minutely in the up-and-down direction and the position thereof can be adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an ink jet recording apparatus using a recording head having a plurality of nozzles.

Conventional examples and their problems In recent years, inkjet recording devices have been actively developed as facsimiles and image output devices. Inkjet recording devices perform recording by ejecting tiny ink droplets onto the recording paper surface, but currently there are efforts to improve the quality of recorded characters and recorded images.
Along with the second research, research on high-speed recording is also active. Particularly regarding the latter, many high-speed recording apparatuses using a plurality of recording heads have been proposed.

However, the problem here is that when multiple recording heads are used in the latter case, it is necessary to finely adjust the positions of the multiple recording heads and precisely adjust the recording 1 and 2 positions for each recording. It is a question of -). For example, when recording a plurality of lines by continuously ejecting ink from each recording head, if the position of the recording head is improperly adjusted, a recording deviation that can be easily seen and detected will occur. To prevent this, between each recording line,
It is necessary to keep it within about 20μ, and high precision adjustment is required. On the other hand, in order to fit multiple recording heads into a carriage, it is impossible to accommodate them through numerous parts.
J-Kell. However, just because the nozzles of multiple heads are lined up in a straight line, it is not possible to line up the nozzles of multiple heads in a straight line; instead, a standard is set for each recording head, and adjustments are made while positioning to keep the nozzles within the tolerance. I needed to.

Therefore, the position adjustment parts for the recording head are required to have a simple structure and be capable of highly accurate adjustment.

FIG. 1 shows an example of an inkjet recording apparatus using one recording head, in which the recording head 1 is fixed on a carriage 2, a recording paper 4 is fed by a drum 3, and the recording paper 4 is fed by an arrow P. The carriage 2 moves in this direction, and recording is performed using ink droplets ejected from the rad 1 onto the recording surface.

FIG. 2 shows the recording head 1 shown in FIG. 1 viewed from the plane of the paper, in which a plurality of nozzles 6 are lined up in a row, perpendicular to the scanning direction of arrow P in FIG. The distance between recording dots on the recording paper surface in the same direction is equal to the dimension shown in FIG. This size directly affects the recording density, so
It was necessary to take a lot of time and precision to make the adjustments.

However, since the recording head 1 is generally housed through many parts, it is difficult to accurately and easily adjust and set the nozzle spacing in the scanning direction.

This kind of adjustment is particularly difficult to achieve accurately when using multiple recording heads with multiple nozzles, not to mention when multiple recording heads with a single nozzle are used. Therefore, it was necessary to be able to easily perform highly accurate adjustments.

OBJECTS OF THE INVENTION In view of the above drawbacks, the present invention provides an inkjet recording apparatus having a mechanism that allows easy adjustment.

Structure of the Invention In order to achieve the above object, an inkjet recording apparatus of the present invention has a recording head having a plurality of nozzles rotatably fixed to a head fixing plate, a tapered hole formed in the head fixing plate, and a tapered hole formed in the head fixing plate. 1J with one end fixed to the recording head.
An adjusting bolt having a slidable taper is passed through the taper fJ, and the head fixing plate is attached to a head carriage so as to be movable in a direction perpendicular to the scanning direction of the recording head.

DESCRIPTION OF EMBODIMENTS The present invention provides an inkjet recording apparatus having a mechanism that allows such adjustments to be made easily.

3(a) and 3(b) show an embodiment of the present invention, in which the recording head 1 rotates around a shaft 6. In FIG. Reference numeral 8 denotes a bolt for fine adjustment of this rotational movement, which fixes the head fixing plate 7 to the shell recording head 1 as shown in FIG. 2(b). A taper 9 is formed on the side of the bolt 8, and a taper 10 is also formed in the through hole 70 of the bolt 80 drilled in the fixing plate 7. The lower taper of the bolt 8 and the lower taper of the through hole 70 of the head fixing plate 7 are always in contact.

Now, when the bolt 8 is turned in the C' direction, the bolt 8 moves in the C' force direction in FIG. 6 in the direction of arrow B'.

Therefore, the angle θ between the nozzle array of the recording head 1 and the scanning direction in FIG. 2 changes, and the nozzle spacing in the direction perpendicular to the scanning direction is adjusted. When the adjustment by the rotational movement of the recording head 1 is completed, the recording head 1 and the recording head fixing plate 7 are fixed by bolts 14.

On the other hand, the downward adjustment of the recording head 1, that is, the position adjustment in the direction perpendicular to the scanning direction of the recording head 1, is performed by the bolt 13.
done by. That is, the recording head fixing plate 7 is the guide 1.
The head fixing plate 7 moves slightly in the vertical direction due to the movement of the bolt 13. Therefore, the recording head 1 can be slightly moved in the downward direction to adjust its position. After completing the position adjustment, fix the recording head fixing plate γ and the guide 11 using steps 15 and 16.

FIG. 4 shows an example in which inks of four colors, yellow, cyan, magenta, and black, are ejected from each recording head to perform color recording.

The recording dots ejected from the '8 recording head must overlap without the slightest deviation. For this purpose, it is necessary to adjust the position of each recording head so that the recording dots are the same on the recording paper surface. Adjustment in such a case can be easily performed using the above-mentioned wooden structure. Figure 5 shows the fourth
The state of the nozzle rows of each recording head in the figure is shown. 6th
In the figure, variations in the position and inclination of the nozzle rows are exaggerated to make it easier to understand. The angles formed by the scanning direction X and the nozzle array are different from ~, θM, and θC2θB, respectively. Therefore, it is natural that the nozzle intervals in the scanning direction or in the direction y perpendicular to the scanning direction are also different from LY, LM, Lc, and LB. The position of the lowest nozzle in the groove nozzle row in the scanning direction X is also different. The angles θY, θM, θC1θB formed between the nozzle row and the nozzle scanning direction X are adjusted by the rotational movement mechanism shown in FIG. The nozzle intervals Ly, LM, LC, and LB in the direction y perpendicular to the scanning direction can be set in LK stages. FIG. 6 shows the state of the nozzle row after this adjustment. Thereafter, the nozzle array is moved in parallel to the direction y perpendicular to the scanning direction X by the linear movement mechanism described in FIG. Therefore, the position of the recording dots in the scanning direction X can be adjusted while keeping the nozzle interval in the direction y perpendicular to the scanning direction X, that is, the recording dot interval, constant. FIG. 7 shows the state of the nozzle array after this adjustment is completed, and the nozzle positions of each recording head in the scanning direction X are as follows:
Perfect match. In this way, adjustment using a plurality of heads can be easily performed.

FIG. 8 shows an embodiment of the present invention which is equipped with a second linear movement mechanism for linearly moving the recording head 1 in the scanning direction X, in addition to the rotational movement mechanism and first linear movement mechanism shown in FIG. It shows. Since the operations and effects of parts common to those in FIG. The end face of the base 12 is held down by a spring 26, and the opposite end face is held down by a bolt 27.By adjusting the bolt 27, the base 12
can be moved parallel to the scanning direction X. Therefore, when recording the character X on the recording paper 4, by adjusting the bolt 27, the recording can be easily performed at a position shifted by the distance S as shown in the figure. Providing such a mechanism that can move parallel to the scanning direction X is particularly convenient in an apparatus using a plurality of recording heads each having a plurality of nozzles. FIG. 9 shows an embodiment for explaining this, in which four recording heads Y, M, C, and B are arranged in the scanning direction. Since the recording head is provided with the linear motion mechanism that moves in the scanning direction or parallel to the scanning direction described above, the position of each recording head in the scanning direction X can be easily adjusted.

FIG. 10 shows an embodiment of the present invention used in a cylindrical scanning system. The recording head 1 records with its nozzle rows being more than perpendicular to the direction of rotation of the recording paper 4. With the rotation mechanism according to the present invention, by adjusting the bolt 8 about the shaft 6, the inclination of the nozzle array with respect to the rotational direction of the recording paper 4 can be changed, and the nozzle spacing in the rotational direction of the recording paper 40, that is, the recording dots can be adjusted.

FIG. 11 shows an embodiment of the present invention in which a large number of recording heads 1 are arranged in the direction of rotation of the recording paper 40. In FIG. The nozzle array of each recording head 1 performs recording while being inclined from a right angle to the rotational direction of the recording paper 4. By adjusting the bolt 8 around the shaft 6 using the rotation mechanism of the present invention, the inclination of the nozzle array with respect to the rotational direction of the recording paper 4 is changed, and the nozzle interval in the rotational direction of the recording paper 4, that is, the recording dot interval can be adjusted. can.

Since the position can be adjusted in the horizontal direction using the twisting bolt 13, the nozzles of each recording head 1 relative to the rotational direction of the recording paper 40 can be overlapped, and only the recording dots can be aligned.

Effects of the Invention As mentioned above, according to the present invention, the effect is particularly great when a plurality of heads are used.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a normal inkjet recording device;
The figure is a perspective view of the recording head used in the present invention, and FIG.
(a) is a perspective view of an inkjet recording device according to an embodiment of the present invention, (b) is a sectional view of the same essential part, and FIG.
FIGS. 5, 6, and 7 are explanatory diagrams of the operation, and FIGS. 8, 9, 10, and 11 are diagrams showing still other embodiments of the present invention, respectively. 1... To record, C, 2... Carriage, 3... Mountain drum, 4... Recording paper, 6...
...Axis, γ...Head fixing plate, 8.13...
...Boruto, 9, 10... River Theba, 11...
··guide. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig. 2 Fig. 3 oL1 (b) Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 1 Fig. 9 and Fig. 10 Fig. 11

Claims (3)

[Claims] (1) A recording head having a plurality of nozzles is rotatably fixed to a head fixing plate, a tapered hole is drilled in the head fixing plate, and one end of the recording head is fixed to the recording head inside the hole. 1. An inkjet recording apparatus, characterized in that an adjustment bolt having a tapered surface extends through the head fixing plate, and the head fixing plate is attached to a single-edge carriage so as to be movable in a direction perpendicular to the scanning direction of the recording head. (2) An inkjet recording apparatus according to claim 1, which has a plurality of recording heads, and includes one or more rows of recording heads in the scanning direction. (3) The inkjet recording apparatus according to claim 1, further comprising a linear movement mechanism capable of adjusting the position of the recording head in a direction parallel to the scanning direction.