JPS58217363A - Ink jetting device - Google Patents

Abstract

PURPOSE:To obtain the titled device, wherein the values of pressurization of a pressurizing means are set at a plurality of stages, ink is pressurized at the pressurizing values suitable for various situations from the poor jetting of the ink to no jetting of the ink, and restoring the normal state. CONSTITUTION:When the poor jetting or no jetting of ink is detected by a detecting part 6, a switching valve 2 is switched, and the detected signal from the detecting part 6 is fed back to a feedback operation circuit 7. The operation circuit 7 controls the pressurizing of a pressurizing means 1 to the lowest pressure based on the detected signal and a control signal sent from a control signal input terminal 8. Thus the pressurization is performed. When the normal jetting state is not obtained by this pressurization, the operation circuit 7 controls the pressurizing of the pressurizing means 1 so that pressure which is one stage higher is obtained, and the pressurization is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink ejecting device, and more particularly to an ink ejecting device that restores a normal state by pressurizing ink using a pressurizing means when ink is not ejected from a nozzle or is ejected poorly.

Conventionally, in this type of ink ejection device used in inkjet printers, etc., there are cases where air bubbles or foreign matter enter the nozzle that ejects ink, or when the ink is left for a long time and the ink at the tip of the nozzle thickens or solidifies. As shown in FIG. 1, an ink pressurizing means is provided in order to restore a normal state to a state in which ink is not ejected or is poorly ejected.

That is, the pressurizing means indicated by the reference numeral 1 is a pump, a granger, etc., and is installed in the middle of a pipe 5 that connects an ink tank 3 for supplying ink and a nozzle 4 for discharging ink. It is being Furthermore, a switching valve 2 for switching the ink flow path is provided in the middle of the vibrator 5 that connects the pressurizing means 1 and the ink tank 3.

The pressure generated by the pressurizing means 10 is determined to be a certain set value that can cover problems ranging from non-ejection of ink to ejection failure.

When non-ejection or ejection failure is detected by an appropriate detection means (in some cases, visual inspection, etc.), the switching valve 2 is switched, and the pressurizing means 1 is operated to pressurize the ink, and the nozzle 4 is Push out ink from the tip.

As a result, air bubbles and foreign matter in the nozzle 4 are pushed out together with the ink, thickened ink is pushed out from the nozzle, and new ink is filled to restore ejection.

By the way, as mentioned earlier, the set value of the pressure of the pressurizing means is constant and covers ejection failures from ink failure to ejection, but the pressure suitable for treating ejection failures is not strong enough to treat ejection failures. As a result, a large amount of ink is wasted and the ejected ink must be disposed of, which requires a complicated mechanism and increases costs.

However, if you avoid this drawback and set the pressure to a suitable level to treat discharge failures, the pressure will not be sufficient to treat discharge failures.
The operator must repeat the pressurizing operation many times to resolve the non-discharge, and the operator must spend a long time and effort to do so.

In any case, since the pressure of the pressurizing means of the conventional device is a constant value, one or both of the above-mentioned disadvantages cannot be avoided.

The present invention has been made in view of the above circumstances, and eliminates the needless outflow of ink in the case of ink ejection failure, and saves the operator's effort in a short time in the case of ink ejection failure. It is an object of the present invention to provide an ink ejecting device equipped with a pressurizing means that can perform processing without any burden.

In order to achieve this object, the present invention sets the pressurizing pressure value of the pressurizing means in a plurality of stages, and also sets the pressurizing pressure value of the pressurizing means in multiple stages, and applies the pressure of the pressurizing means via an ink ejection state detection sensor and a feedback calculation circuit. A configuration was adopted to control the pressure value.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Details of embodiments of the present invention will be described below with reference to the drawings. Second
Although the diagram shows the configuration of an embodiment of the present invention, the same or corresponding parts as in FIG.

In the embodiment of the present invention, the pressurizing means 1' is, for example, a pusher provided in multiple stages, or a variable capacity type shown in FIG. 3, in order to set the pressurizing pressure in multiple stages. I try to use bonder.

In the variable displacement pump shown in Fig. 3, a cylinder 12 is provided with a piston 11 which is biased by a spring 10 and can move up and down and rotate.By determining the rotation angle of the piston 11, a predetermined pressure can be maintained. The ink supplied from the ink tank 3 connected to the pipe 13 can be supplied to the nozzle 4 via the pipe 15. That is, the piston 11. By controlling the rotation angle in multiple stages, the generated pressure can be easily set in multiple stages.

A feedback calculation circuit 7 for controlling the generated pressure is connected to the pressurizing means 1', and the feedback calculation circuit 7 includes a detection section disposed near the ejection opening of the nozzle 4 to detect the ink ejection state. 4 is connected to a control signal input terminal 8 for inputting a control signal.

The feedback calculation circuit 7 changes the pressurizing pressure of the pressurizing means 1' from the initial low pressure based on the detection signal of the ink ejection state sent from the detection section 4 and the control signal sent from the control signal input terminal 8. , the control is performed so that the ink ejection state is increased in stages until the ink ejection state becomes normal.

This initial low pressure setting value is the minimum setting value necessary to remove bubbles and dirt that cause normal ejection failure and normalize the ink ejection condition, and the maximum pressure setting value is the ink pressure setting value. This is the pressure value necessary to treat the sticking of

A plurality of pressure values are set between the minimum pressure and maximum pressure settings.

The operation of the embodiment of the present invention having the above configuration will be explained.

When the detection unit 6 detects ink ejection failure or non-ejection, the switching valve 2 is switched and a detection signal is sent from the detection unit 6 to the feedback calculation circuit 7.
The feedback calculation circuit 7 controls the pressurizing means 1 based on the detection signal and the control signal sent from the control signal input terminal 8.
Pressurization is performed by controlling the pressurization pressure to the above-mentioned minimum pressure.

If a normal ink ejection state cannot be obtained with this pressurization, the detecting section 6 detects ink ejection failure or non-ejection, and a detection signal is sent to the feedback calculation circuit 7. Based on this, the feedback calculation circuit 7 controls the pressurizing pressure of the pressurizing means 1' to be one step higher than the lowest pressure, and pressurizes.

This operation is repeated, the pressure of the pressurizing means increases step by step, and pressurization is repeated until the ink ejection condition becomes normal.

In the above embodiments, in addition to the lowest value and the highest value, one or more values between them are set as the setting values of the pressurizing means. There are only two set values: a low pressure for discharge failure after long-term storage, and a high pressure for discharge failure after long-term storage, and pressurization can be performed by selecting one of the two depending on the situation. You can also do it.

As is clear from the above description, in the present invention, the pressure value of the pressurizing means is set at multiple levels, so that ink can be prevented from being left for a long time due to ejection failure due to air bubbles and dust during normal use. It is possible to restore the normal state by pressurizing the ink at a pressure value suitable for each of the various situations before ejection failure due to sticking, and it is possible to prevent the ink from flowing out unnecessarily. In addition, since we have adopted a configuration in which the pressure value of the pressurizing means is controlled via a detection sensor and a feedback calculation circuit, processing is automatically performed, which has the excellent effect of reducing the labor and time of the operator. is obtained.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of a conventional ink ejection device, FIG. 12 is an explanatory diagram showing the configuration of an embodiment of the present invention, and FIG. 3 is an example of a pressurizing means in an embodiment of the present invention. FIG. 2 is a sectional view illustrating a variable capacity pump. 1.1'...pressurizing means, 2...switching valve, 3...
・Ink tank, 4... nozzle, 5... pipe, 6
. . . detection unit, 7 . . . feedback calculation circuit, 8.
...Control signal input terminal, 10...Spring, 11...Piston, 12...Cylinder/cylinder.

Claims (2)

[Claims] (1) In an ink ejecting device that restores a normal state by pressurizing ink with a pressurizing means to recover from non-ejecting or defective ejection of ink from a nozzle, the pressure value of the pressurizing means is varied over multiple stages. An ink ejection device characterized by: (2) The ink ejecting device according to claim 1, wherein the pressurizing pressure value of the pressurizing means is controlled via an ink ejection state detection sensor and a feedback calculation circuit.