JPH04187440A - Ink jet recorder - Google Patents

Abstract

PURPOSE:To transmit efficiently oscillation amplitude of an exciting body to an ink jet so as to produce proper ink particles by pressing in a sticking manner an end of the exciting body to an end face of a case which holds the end of the exciting body, pressing the other end of the exciting body by an elastic member, and making it possible to adjust these presses. CONSTITUTION:An exciting body 2 is fixed in exciting body cases 32, 33 and a filter case 26. Ink to be supplied by a tube 27 is supplied to a tip of a nozzle from the filter case 26 through the exciting body 2. O-rings 23 and 24 are arranged in such a manner that pressure is exerted in the vertical direction and the pressure is not exerted in the axial direction with respect to the exciting body 2. An end of a counter ink jet 30 of the exciting body 2 is pressed so as to stick to an end face of the filter case 26 and an end of an ink jet 30 of the exciting body 2 is pressed by an elastic member 29 and a collar 28. These presses are adjusted by clamping or releasing with screws 31 provided on the exciting body cases 32 and 33. Accordingly, cavity is not generated between the exciting body 2 and the end face of the case 26. Also, expansion and contraction of the exciting body 2 changes only at the ink jet 30, without absorbing the oscillation of the exciting body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an inkjet recording apparatus, and particularly to a support mechanism for a vibrating body suitable for producing ink particles.

[Conventional technology]

Generally speaking, as means for creating ink particles in vibrating inkjet recording devices, there are two methods: one in which a vibrating body and an ink droplet jetting port are integrated and utilizing the mechanical resonance of the vibrating body, and another in which the fluid resonance of the ink is utilized. be. -The latter method, which utilizes fluid resonance, is often used in boat fishing. The support mechanism for the vibrating body is supported through O-rings at both ends of the vibrating body, which also serve to prevent liquid leakage. Related devices of this type include, for example, Japanese Patent Application No. 53-10
No. 484 is mentioned.

[Problem to be solved by the invention]

In the above conventional technology, no consideration is given to efficiently transmitting the vibration amplitude of the vibrating body to the ink jet port integrated with the vibrating body, and it is necessary to give a large amount of energy to the vibrating body. There was a problem that ink particles could not be created.

An object of the present invention is to be able to efficiently transmit the vibration amplitude of a vibrating body to an ink jetting port without applying large energy to the vibrating body, and to create suitable ink particles.

[Means to solve the problem]

In order to achieve the above object, the vibrating body is supported movably in the axial direction in a case that holds the vibrating body, and the supporting end face of the vibrating body on the side opposite to the ink jetting port and the end face of the case opposite to the supporting end face of the vibrating body are The supporting end face of the vibrator on the ink jet port side is pressed by an elastic member so that the vibrator is in close contact with the vibrator, and this pressure can be adjusted by tightening or loosening a screw provided on the vibrator case. be.

[Effect]

The vibrator inside the case that holds the vibrator is compressively vibrated in the axial direction by an external power source. The supporting end surface of the vibrating body on the ink jetting port side is pressed by an elastic member so that the supporting end surface of the vibrating body on the side opposite to the ink jetting port and the end surface of the case opposite thereto come into close contact with each other, and this pressing force is applied to the vibrating case. Adjustments are made by tightening or loosening the screws provided, so there is no gap between the vibrating body and the end face of the case, and the vibration of the vibrating body is not absorbed. It changes only on the side. As a result, the vibration amplitude of the ink ejection port that is integrated with the vibrating body is larger than that of the vibrating body that is supported by elastic members at both ends. It can be transmitted as the vibration amplitude of the exit section.

〔Example〕

The configuration and operation of one embodiment of the present invention will be explained below with reference to FIGS. 1 and 2.
This will be explained using figures.

FIG. 1 is a schematic diagram, and FIG. 2 is a detailed diagram of the vibrator support mechanism. A vibrating body 2 including a piezoelectric element 4 that generates ink particles 1, a nozzle 18 and 5 having an ink ejection port, a control system that charges and deflects the ink particles 1 ejected from the nozzle 18, and a control system that charges and deflects the ink particles 1 ejected from the nozzle 18; It consists of an ink circulation system that supplies ink.

That is, the vibrating body 2 including the piezoelectric element 4 is connected to the excitation source 3, and the mechanical vibration of the piezoelectric element 4 causes the nozzle 1 to
8. Ink particles are ejected from the tip.

Reference numeral 5 denotes a charging electrode arranged at a position where the ink particles 1 are separated from the ink column at the tip of the nozzle, and connected to an information signal source 6. The pulsed information signal voltage applied to this charging electrode 5 causes the above-mentioned The ink particles 12 are charged to have a predetermined charge.

The charged ink particles 1 then pass through deflection electrodes 8 facing each other across the flight path.

At this time, the ink particles 1 are deflected by a predetermined amount depending on the amount of charge of each ink particle, and adhere to the recording medium 9.

On the other hand, the ink particles 1 to which no charge has been applied continue straight and are prevented from adhering to the recording medium 9 by the gutter 10.

Furthermore, 11 is ink stored in an ink tank 12, and this ink 11 is pumped 13. The gutter 10 is supplied to the vibrating body 2 via the filter 14 and the regulator 15.
The ink 11 blocked by the ink is circulated to the ink tank 12 via a filter 16 and a pump 17.

In the apparatus of the present invention configured as described above, the ink 11 is transferred from the ink tank 12 to the filter 14 by the pump 13.
．． It is supplied to the vibrating body 2 under pressure through the regulator 15.

This pressurized ink 11 passes through the vibrating body 2, passes through the next ink chamber 19, and is ejected from the tip of the nozzle 18, and is caused by the excitation source 3 applied to the piezoelectric element 4 included in the vibrating body 2. It becomes regular ink particles 1.

The ink particles 1 are given a charge according to the character signal by the charging electrode 5, are deflected by the electrostatic field in the deflection electrode 8, fly over the gutter 10, and collide on the recording medium 9.

By moving this recording medium 9 in a direction perpendicular to the deflection direction of the ink particles 1, a printed dot matrix is formed on the recording medium 9.

On the other hand, ink particles 1 (charged electrode 5) that were not used for printing
Ink particles that are not given a charge when passing through 1)
The ink travels straight without being deflected by the deflection electrode 8, collides with the gutter 10, and is collected by the pump into the ink tank 12.

Next, the support structure of the vibrating body 2 will be explained using FIG. 2. It is integrally constituted by a lock nut 21 that fixes the piezoelectric element 4 inserted into the pipe 19 and the terminal 20.

Furthermore, a terminal 20 is connected to the excitation source 3 via a lead sensor 22 so that the voltage element 4 is vibrated at a predetermined frequency by the excitation source 3. This vibrating body 2 is connected to vibrating body cases 32 and 3 via O rings 23 and 24 at both ends.
3 and fixed within the filter case 26, the tube 2
The ink 11 supplied by the nozzle 7 is supplied from the filter case 26 through the vibrator 2 to the tip of the nozzle 8 without leaking.

○ Pressure is applied to the rings 23 and 24 in a direction perpendicular to the vibrating body 2, but no pressure is applied in the axial direction of the vibrating body 2. One end of the vibrator 2 on the ink jet port 30 side opposite to the ink jet port 30 is connected to the elastic member 29 and the collar 28 so that the end of the vibrator 2 on the ink jet port 30 side is in close contact with the end surface of the filter case 26 .
Since the pressure is adjusted by tightening or loosening the screws 31 provided on the vibrating body case 32 and 33, there is no gap between the vibrating body 2 and the end face of the filter case 26, and Since the vibration amplitude of the vibrator 2 is not absorbed, the vibration amplitude of the vibrator 2 is maximized at the ink ejection port 30. Therefore, by simply applying a small amount of energy to the vibrating body 2, ink is ejected from the ink ejection port 30 at the tip of the nozzle 18, and there is an effect that the ink particles 1 are easily formed.

〔Effect of the invention〕

According to the present invention, the other end of the vibrating body is pressed by an elastic member so that one end of the vibrating body is brought into close contact with the end surface that receives the vibrating body, and this pressing force is adjusted to produce ink particles while saving energy. There is.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the configuration of the apparatus of the present invention, and FIG. 2 is an enlarged sectional view of one embodiment of the vibrating body support mechanism used in the apparatus of the present invention. DESCRIPTION OF SYMBOLS 1... Ink particle, 2... Vibrator, 4... Piezoelectric element, 23.24... 0 ring, 18... Nozzle, 19
... pipe, 28 ... collar, 29 ... elastic member,
3 Threaded portion, 32.33... Vibrating body case, 26... Filter case, 30... Ink spout.

Claims (1)

[Claims] 1. Ink particles supplied from an ink tank are ejected from a nozzle tip that is integrated with an excitation element in synchronization with the vibration period of an excitation element, and the ejected ink particles are In a device that is charged with a predetermined information signal, deflected, and deposited on a recording medium, one end of the vibrating body is made of an elastic member so that one end of the vibrating body is brought into close contact with the end face of a case that holds the vibrating body. An inkjet recording device characterized by applying pressure and making the pressure adjustable. 2. The inkjet recording apparatus according to claim 1, wherein the pressure is adjusted by a screw provided in the case.