JPS6179665A - Orifice moving type ink jet apparatus - Google Patents

Abstract

PURPOSE:To enable the stable emission of ink, by providing a moving plate having the almost same number of holes as nozzles to the leading end parts of the nozzles and using said holes as the orifice parts of an ink jet head and providing a new orifice part to the nozzle part if necessary. CONSTITUTION:A moving plat 12 having a large number of orifices 10 is places on an ink jet head 13 and each nozzle 20 of the ink jet head 13 coincide with each orifice of the moving plate 12. An ink particle 15 is emitted to the direction shown by the arrow 17 through each orifice 10. When the orifice 10 during use is clogged by dust or the coagulation of ink as shown by the numeral 19, the moving plate 12 having the orifices 10 moves and the new orifice 10 is issued to the nozzle surface. By this method, the emission of the ink is again enabled. By variously changing the size of each orifice 10, the size of an image dot can be arbitrarily changed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an inkjet recording apparatus that constantly provides new oriSwiss.

[Technical background of the invention and its problems]

Inkjet recording devices are capable of high-speed printing with low noise, and the recording paper can be plain paper, which can be developed. Since no processing such as fixing is required, office automation
) It is attracting attention as an electronic printer that plays a part in the system.

The inkjet recording device uses an electric field control method
-13768), pressure pulse method (Special Publication No. 53-121)
38) etc. These methods differ in the method of forming ink droplets. In the electric field control method, hydrostatic pressure is applied to an extent that the ink does not flow out from the orifice at the tip of the nozzle, the ink meniscus is fully convex, and the ink is suctioned and ejected by applying an electrostatic field. On the other hand, a pressure pulse type inkjet recording device uses a piezoelectric element to rapidly pressurize ink to eject all of the ink.

All of these inkjet recording devices d have a common drawback. In other words, if the ink was left unused for a long time, the ink at the tip of the nozzle would solidify, preventing ink from being ejected. In particular, the diameter of the ink ejection hole at the tip of the nozzle is very small, and this is likely to occur.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks and provides an inkjet device that performs stable ink ejection.

[Summary of the invention]

Next, an outline of this invention will be described. At the tip of the inkjet nozzle, there is a movable plate with a hole of the same size as the nozzle, which has good sealing properties and is movable.This hole is used as the inkjet orifice.There should be no dust or dirt in the orifice for a long period of time. If the ink coagulates and ink is no longer ejected, the movable plate having the orifice where the dust has adhered or the ink has coagulated is removed, and a new orifice portion is set in the nozzle portion.

〔Effect of the invention〕

According to this invention, the nozzle orifice portion (
・There is no need to replace the entire inkjet head every time ζ dust or ink coagulation occurs, and maintenance can be easily performed by simply moving the movable plate with the orifice. Furthermore, since the orifice is created on a moving plate separate from the inkjet head, a stable orifice can be easily created and stable ink ejection can be obtained.

[Embodiments of the invention]

Next, an example of the invention will be explained based on the drawings.

FIG. 1 shows the nozzle part of the present invention, with a large number of orifices α
Moving plate with Q (1, inkjet head αJ
and the nozzle of the inkjet head (
The ground and the orifice Ill in this moving plate coincide. Ink particle haze is ejected through this orifice in the direction of the arrow (uniform). This moving plate da is covered with an ink sealing cover 1i4 made of plasticity such as rubber to prevent the ink from flowing out from the turn 9. , movement of the moving plate on the nozzle surface is possible. If the orifice in use becomes clogged due to dust or solidified ink, the first thing to do is to move the moving plate that has this orifice and bring out a new orifice αI on the nozzle surface.In this way, ink can be ejected again. Become. Further, FIG. 2 is a schematic diagram of an actual pressure pulse type inkjet head with a moving plate U3 having an orifice attached thereto. In this case, since the inkjet head has multiple nozzles, the moving plate for orifice fit:v also has multiple orifices. Here (in particular, it is a piezoelectric element, this piezoelectric element is individually selected and driven according to a signal to eject ink. Also, Fig. 3 shows the ink ejection orifice G1) and the solidification of the ink and the like. If the blockage is large, the provision of a large orifice facilitates the removal of ink coagulation. Furthermore, by varying the size of this orifice, it is also possible to arbitrarily change the size of the image dot.

The present invention described in detail above includes any modifications within its scope as long as it does not depart from the spirit thereof.5 It is also applicable to any type of inkjet head.

[Brief explanation of the drawing]

Fig. 1 is a cross section of one embodiment of the present invention (4), Fig. 2 is a perspective view of the invention applied to a full pressure pulse type inkjet head, and Fig. 3 is a diagram showing another embodiment of a thin plate having an orifice. Yes. α ri / inkjet head hard… nozzle α 2 /
...Has an orifice? A'+ Board I Ink sealing cover Representative Patent attorney Kensuke Norichika (and one other person) Figure 1

Claims (1)

[Claims] (1) A movable plate having a large number of orifices consisting of holes of the same size as the nozzle is provided at the nozzle tip, and new orifices of the movable plate are sequentially moved to the nozzle tip as necessary. Orifice moving type inkjet device.