JPS621833B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording head for an inkjet printer, and in particular to an improved recording head configuration to eliminate the adverse effects of ink mist generated when ink particles collide with recording paper. This is related to.

Conventionally, recording was performed by colliding ink particles at right angles to the recording paper, which generated a large number of fine ink particles (ink mist), which could stain the recording surface or adversely affect the pressure resistance of deflection plates, etc. It was affecting me.

In order to prevent this, as shown in Japanese Patent Publication No. 52-15336, the recording paper is tilted with respect to the flight direction of the ink particles to reduce the collision force of the ink particles and prevent the generation of mist. Methods have been proposed to reduce this.

However, although the above proposal has reduced the generation of ink mist to some extent, the amount of ink mist generated there still cannot be ignored, and there is a need for measures against such ink mist.

The present invention has been made to further eliminate these disadvantages, and includes an ink mist absorbing device in the recording head of an inkjet printer to eliminate these adverse effects.

FIG. 1 shows the appearance of the present invention, in which a recording head 1 is movably attached to guide shafts 2 and 3, and is moved by a wire 4 in a direction perpendicular to the feeding direction of recording paper 5. The recording head 1 has a case 1A in which particle recording members such as a jet nozzle, a charging electrode, and a deflection electrode are housed.

FIG. 2 shows the recording head 1 in detail.

The recording head 1 is a case body 10 with an open front.
and a member 12 provided at the front opening of the case body 10. Further, an opening 14 through which ink particles pass is formed in the center of the member 12. Furthermore, inside the recording head 1 is a partition plate 11.
It is separated into two chambers 15 and 16 by.
A fan 20 is attached to a connecting path between these two chambers 15 and 16. This fan 20 sucks air from chamber 15 and exhausts it into chamber 16. An opening 13 is formed at the tip of the chamber 15 for intake of outside air. In this way, the recording head 1 has an opening 1 for inhaling outside air.
Only two holes, 3 and 14, which serve as flight paths for ink particles, are opened, and the rest are sealed. Said first
The chamber 16 includes a nozzle 23 fixed by a mounting member 24, a charging electrode 22, and a pair of upper and lower deflection plates 2.
1, and a gutter 25 for sucking up unnecessary ink.

These nozzles 23, charging electrodes 22, deflection plates 2
1, the flight line of the ink droplets is fixed at an angle Q in the direction of movement of the recording head 1 (recording direction) from the perpendicular line of the recording paper.

A mist removal filter 30 is provided in the center of the second chamber 15 and is made of a metal mesh assembly that absorbs ink mist in the drawn outside air.

Further, the bottom of the chamber 15 has a tip end inclined downward, and is further covered with a mist absorbing member made of sintered metal or the like.

Therefore, the ink mist sucked through the aperture 13 is
It is removed by a filter 30, flows from the filter 30 through a mist absorbing member on the bottom surface to a sintered metal mist absorbing member 19 covering the front surface of the recording head, and is sent to a discharge section (not shown).

Regarding the recording head 1 having the above configuration, ink particles ejected from the nozzles 23 collide with the recording paper 5 to record characters and the like. At this time, ink mist is generated in a diagonal direction, and an aperture 13 is formed in this diagonal direction. Therefore, as the internal fan 20 rotates, outside air is generated along with the ink mist into the aperture 13 as shown by the arrow. The ink mist is sucked into the case body 10 and removed by the filter 30.

The outside air after the mist has been removed by the filter 30 is sucked into the fan 20 and discharged to the first chamber 16 side. Since only the aperture 14 is open, the outside air discharged into the first chamber 16 flows out of the recording head 1 through the aperture 14, which serves as a flight path for ink particles, as shown by the arrow. be discharged.

Therefore, the ink mist floating in front of the recording surface is forcibly sucked into the recording head 1 and then removed by the filter 30, and the outside air after the mist has been removed is passed through the first chamber 16 and opened. Since the ink mist is discharged through the hole 14, the ink mist will not enter through the hole 14 and will not stain the deflection plate 21 or the like.

Note that the air flow from the fan 20 is directed to the nozzle 2.
It is set to such an extent that it does not affect the ink particles ejected from No. 3.

As described above, since the recording head of the present invention is equipped with a means for sucking ink mist floating on the recording surface, the ink mist can be efficiently collected and removed, and other Adverse effects on the constituent parts can be reliably prevented.

Furthermore, since all the means for sucking ink mist are integrally formed in the carriage, it can be constructed as a compact suction mechanism.

[Brief explanation of the drawing]

FIG. 1 is an external view showing a recording head of an inkjet printer of the present invention, and FIG. 2 is a diagram showing the configuration of the recording head. 1: Recording head, 1A: Case, 2 and 3: Guide shaft, 5: Recording paper, 11: Partition plate, 13 and 14: Opening, 20: Fan, 21: Deflection plate, 2
2: Charged electrode, 23: Nozzle, 30: Mist removal filter.

Claims (1)

[Scope of Claims] 1. A recording head of an inkjet printer that jets ink particles to form desired characters, symbols, etc. on a recording medium, comprising an ink jetting means for performing the recording;
a first chamber in which a portion that serves as a flight path for ink particles is opened; a second chamber in which a portion for sucking ink mist and outside air is opened and has a member that absorbs the ink mist; 1. A recording head for an inkjet printer, comprising: a fan that absorbs air from the second chamber and discharges it to the first chamber, and eliminates the adverse effects caused by the generation of ink mist.