JPS6168253A - Ink jet recording apparatus - Google Patents

Abstract

PURPOSE:To enable high speed printing, by selectively forming charge to a thin ink film layer by applying an ion to the surface of the thin ink film layer corresponding to recording information and allowing said ink film layer to oppose to recording paper to fly only the ink on the charge forming layer to the recording paper by electrostatic attraction force. CONSTITUTION:An ink roller 40 is rotated and an ink layer 44 having a uniform thickness is formed by a blade 43 to reach the part directly under an ion stream apply apparatus 23. An ion flows along the route of corona wire 29 shield 30 and electrode 27 ink roll 40. This ion is flowed down from the gap between an electrode 27 and the shield 30 and contacted with the ink of the ink layer 44 to apply charge to the ink. However, the ion can be flowed down to only the electrode 27 to which recording voltage is applied. The ink layer 44 is provided with a charge applied part and a charge non-applied part as mentioned above and only the ink at the charge applied part flies to recording paper 24 by the voltage of a back surface electrode 25 and the centrifugal force due to the roller 40.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an inkjet recording device that is capable of high-speed printing and does not cause clogging of nozzles.

[Conventional technology]

An example of a conventional inkjet recording apparatus is a charge amount control type as shown in FIG.

This inkjet recording apparatus Vi includes a head 3 equipped with a nozzle 2t for ejecting 1ft ink droplets generated by 1Jt pressure vibration, etc., and a charging electrode 4 that charges the flying inkdrops 1t in accordance with a printing (printing) signal.

The charged ink droplet 5 is placed on the charging electrode 4 at +tf.
a deflection electrode 6 that is deflected according to im and attached to the paper 7;
A charge that applies a charging voltage to the charging electrode 4 according to the print signal.
a: * Consisting of a pressure control section 8 (a gutter for collecting ink droplets 1 not used for printing is omitted from illustration).

As shown in FIG. 6, the device 3 is composed of a body 9 provided with a nozzle 2 and a piezoelectric vibrator 10 provided at an end of the body 9 facing the nozzle 2. Ink is supplied to the ink chamber 11 formed by the bong chamber 11 through an inflator 12 and a bong pump 13, and a constant static pressure is applied to the bong chamber 11. Further, the piezoelectric shifter 10 performs ultrasonic vibration ijb by being driven by the ultrasonic signal from the excitation source 14.

In the above configuration, the vibration of the piezoelectric vibrator 10 is
When the ink in the chamber 11 is excited and the nozzles 2 and 2 droplets 1 are continuously ejected, the ejected ink ml flies toward the charging electrode 4, and the charging electrode 4 is pierced with an ellipse. Charge is applied according to the print signal. The charged ink droplets 5 are deflected by the deflection electrode 6 according to i*i of 7, and adhere to the recording paper 7, completing printing.

The above operations are carried out until printing for one line is completed, and at the same time as the printing is completed, the recording paper 7 is moved by a certain width in the direction of the arrow. Since such inkjet printing can use plain paper as the recording paper, it is possible to simplify the f4 format and reduce costs.

However, in this conventional inkjet recording device, the printing speed is slow, and the nozzle is used when recording is not in progress. There is a problem with the ink drying out and clogging the nozzles.

This problem has been resolved to enable high-speed printing.

Inkjet also prevents clogging.

As a digital recording device, there is an application filed as IF Application No. 58-215550. The inkjet recording device in which this application is being applied forms an ink film on the outer circumferential surface of a rotating roll, applies centrifugal force to the ink film, applies an electric field to the ink film in accordance with a print signal, and generates static electricity due to this electric field. The ink *t- is formed by the electric attraction force and the centrifugal force.

[Problem that the invention seeks to solve]

However, in the inkjet recording apparatus of this application, if the electrostatic attraction force and the centrifugal force are below a predetermined level, the accuracy of ink droplet formation may decrease.

[Comparative Means and Effects for Solving the Problems] The present invention has been made in view of the above, and in order to improve the accuracy of ink droplet formation, ion flow is applied to the surface of the ink thin film layer according to recorded information. An inkjet in which a charge is selectively added by applying a charge t, this ink thin film layer is made to face a recording paper, and the charged part is attached to the recording paper by electrostatic attraction to perform recording. The present invention provides a recording device.

[Disaster example]

Hereinafter, an inkjet recording apparatus according to the present invention will be explained in detail.

FIG. 1 shows the basic configuration of an embodiment of the present invention, including a blade 21 that applies a thin layer of ink to the surface of a moving body to form a uniform thin film, and a blade 21 that applies ink to the surface of a moving body to form a uniform thin film; On layer 22.

An ion flow adding device 23 is placed in close proximity and selectively generates an ion flow in the line direction according to the recording signal to add charge. The back electrode 25 is configured to apply a voltage of opposite polarity to the recording paper 24 and convey the recording medium 124 at a constant speed, causing only the ink having a charge given by the ion flow to fly and adhere to the recording paper 24 due to electrostatic attraction. be done.

As shown in FIGS. 2 and 3, the ion flow adding device 23 is arranged at regular intervals at the end of the insulating material 26 in correspondence with the dots, and is selectively driven according to recorded information. A required number of electrodes 27 to which a voltage (for example, -1-70 (1')) is applied from the circuit 28, and a DC high voltage ( For example, a corona wire 29 to which a voltage (+4 kV to +6 kV) is applied, a lower part of the corona wire 29 facing the electrode 27 and a slit' provided at the upper part of the corona wire 29, and a DC voltage (for example, -) -70
0V) is applied to the shield 30.

In the above configuration, the ink layer 22 formed into a predetermined thin film by the blade 21 moves in the direction of the arrow, and directly below the electrode 27 of the ion flow adding device 23, the ink layer 22 is applied to the electrode 27 to which a voltage is applied according to the recorded information. Ink layer 22 on the facing part
Ions are added only to The portion of the ink layer 22 to which the ions are applied has an electric charge (the same polarity as the voltage applied to the electrode 27), and moves in that state to just below the back electrode 25. Since a voltage of opposite polarity to the voltage applied to the electrode 27 is applied to the back electrode 25, which is wound approximately half the circumference of the 24 ft recording paper, only the portion of the ink to which a charge is applied by the ion flow adding device 23 is electrostatically charged. Ink layer 22 due to attraction
The particles fly from the surface of the recording paper 24 and adhere to the recording paper 24. The ink is ejected simultaneously line by line, and the recording paper 24 is conveyed at the same speed as the moving speed of the ink layer 22, and recording is performed line by line one after another.

FIG. 4 shows a specific embodiment of the present invention, and the same parts as in FIGS. 1 to 3 are denoted by the same reference numerals, so redundant explanations will be omitted, but it is easy to form an ink layer. In order to
1 differs from that in FIG. 1 in that it is rotatably installed.

The filler/hole 41 is filled with a filler/hole 42 so as to be in contact with the level salt formed at the bottom of the ink roller 40, and a thin film of ink is formed on the upper part of the ink adhering surface. A blade 43 for forming # is provided. An ion flow adding device 23 and a back electrode 25 are disposed above and close to the ink roller 40 at a predetermined interval.

For example, the ink roller 4G has an outer diameter of 30mm and a length of 2.
It is made of about 90-grade stainless steel and is grounded. i'fc, rotation speed is 500 rpm ~ 1.00
Orpm'''r: % The speed at which the surface ink does not fly due to the centrifugal force of rotation alone is determined from the relationship with the viscosity of the ink.

For example, the t1 ink 42 has a viscosity of t50P,
An oil-based ink with a conductivity of 5 x 10-'' U151 can be used.
An ink film is formed with a uniform thickness of 0 μtn.

In addition, each electrode 27 has 12 electrodes! A voltage of +700 V is applied to each electrode 27 during recording, and a voltage of 705 V to 730 V is applied to each electrode 27 based on recorded information by the drive circuit 28 during non-recording. By applying a voltage higher than that during recording in this way, the shield 30 and the electrode 27
An electric field can be generated between them to prevent ions generated by corona discharge from flowing down toward the ink layer.

In the above configuration, by rotating the ink roller 40, the ink adheres to the roller surface that comes into contact with the ink 42 in a film form. The ink film due to this adhesion is
3 to form an ink layer 44' with a uniform thickness (10 μm to 30 μm), and then reaches directly below the ion flow adding device 23. A high voltage of +4 kV to 6 kV is applied to the corona wire 29, and +700 V is applied to the shield 30.
, and the same voltage as the shield 30 is 4M.
27 causes ions to flow along the paths of corona wire 29→shield 30 and electrode 27→I/Croll 40. These ions flow down from the gap between the electrode 27 and the shield 30 and come into contact with the ink in the ink layer 44, thereby imparting an electric charge to the ink.

However, ions can only flow down the ion flow adding device 23 when +700V voltage for recording is applied.
Only 1127, +705 to 730 for non-recording
At the electrode 27 to which a voltage of V is applied, a field is generated that blocks the passage of ions as described above, and the ions are prevented from flowing down.In this way, no electric charge is imparted to the ink. The ink layer 44, which has a charged portion and a non-charged portion, reaches a position with its back side facing the pole 25, where the voltage applied to the electrode 25 and the ink %<a Due to the two flight generating forces, the electrostatic attraction generated during the process and the centrifugal force applied to the ink by the 2,400 rotations of the Inoclo, only the ink in the charged areas is drawn from the surface of the row 2.

The recording paper 24 is separated from the paper and flies towards the recording paper 24. An image is recorded when this ink drop reaches the recording paper 24.

〔Effect of the invention〕

As explained above, according to the inkjet recording apparatus of the present invention, ions are applied to one surface of the ink thin film layer according to recording information to selectively form charges on the ink thin film layer.
! Ti provided on the back side of the recording paper with L facing the recording paper.
A method in which only the ink on the charged surface is ejected onto the recording paper by the electrostatic attraction generated by the voltage applied to the recording paper.

Not only is high-speed printing possible, but since it does not have a nozzle like conventional printers, there is no ink clogging.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration diagram of an embodiment of the present invention, FIGS. 2 and 3 are a perspective view and a perspective view of an ion flow adding device according to the present invention, and FIG. 4 is a concrete implementation of the present invention. FIG. 5 is a configuration diagram showing an example of a conventional inkjet recording apparatus, and FIG. 6 is a configuration diagram showing details of the head section of the apparatus shown in FIG. 5. Explanation of symbols 22.44... Ink layer, 21.43... Blade, 23-... Ion flow adding device, 25...
Back electrode, 26... Insulating material, ゛ 27-- Electrode, 2
8... Drive circuit, 29... Corona wire,
30...Shield, 40--Ink roller, 42
···ink.

Claims (1)

[Scope of Claims] An inkjet recording device that prints by attaching ink droplets to a recording paper according to a print signal, comprising: a rotating roll that rotates while applying centrifugal force to an ink film formed on the outer peripheral surface; and a corona discharge. an ion flow generation section that generates ions and applies the ion flow to the ink film of the rotating roll to retain electric charge; and an ion flow generation section that is arranged in the longitudinal direction of the rotating roll in close proximity to each other at intervals corresponding to the pixel density. a group of electrodes that prevent contact between the ion flow and the ink film at the electrodes to which a voltage corresponding to the non-printing signal is applied; A back surface in which a recording paper is disposed on the ink film, a voltage having a polarity opposite to the charge imparted to the ink film is applied, and ink droplets formed by the electrostatic attraction and the centrifugal force of the rotating roll are caused to fly onto the recording paper. An inkjet recording device characterized by being provided with an electrode.