Inkjet recording device

Patent metadata

Field	Value
Publication number	US-11027540-B2
Application number	US-201816496127-A
Country	US
Kind code	B2
Filing date	Mar 12, 2018
Priority date	Apr 5, 2017
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

An object of the present invention is to provide an inkjet recording device capable of adjusting a clearance between prints formed by two nozzles (114, 115), and capable of printing a print content at a high speed. In order to achieve the object, there is provided an inkjet recording device which has two sub-print heads including nozzles (114, 115), charging electrodes (116, 117), deflection electrodes (118, 119), and gutters (120, 121), in which the two nozzles are disposed in a deflection direction of ink particles, and which performs printing on a printed object (124) while moving the printed object (124) relative to the ink particles in a direction substantially perpendicular to the deflection direction of the ink particles, the inkjet recording device having a function for reducing a clearance between print results (125, 126), printed by the two nozzles (114, 115), by controlling a voltage applied to the charging electrodes (116, 117) and a voltage applied to the deflection electrode (118, 119).

First claim

The invention claimed is:

1. An inkjet recording device which has two sub-print heads, each of which includes a nozzle that forms ink particles by applying vibration to ink being ejected under pressure, a charging electrode for charging the ink particles, a deflection electrode for deflecting the charged ink particles, and a gutter for recovering ink particles not used in printing, in which two nozzles are disposed in a deflection direction of the ink particles, and which performs printing on a printed object while moving the printed object relative to the ink particles in a direction substantially perpendicular to the deflection direction of the ink particles,
wherein the inkjet recording device has a function for reducing a clearance between print results, printed by the two nozzles, by controlling a voltage applied to the charging electrode and a voltage applied to the deflection electrode,
wherein one print content is printed by the two nozzles, and
wherein a charging voltage of a first charging electrode, which charges ink particles formed by a first nozzle of the two nozzles, which is disposed upstream in the deflection direction of the ink particles, is changed to a large charging voltage, and a deflection voltage, which is applied to a first deflection electrode which deflects the ink particles charged by the first charging electrode, is changed to a large deflection voltage, and thus a size of the one print content can be adjusted in a state where a space between a print result printed by the first nozzle and a print result printed by a second nozzle is fixed.

2. The inkjet recording device according to claim 1 ,
wherein the voltage applied to the charging electrode and the voltage applied to the deflection electrode are controlled to change the charging voltage of the first charging electrode, which charges ink particles formed by the first nozzle of the two nozzles, which is disposed upstream in the deflection direction of the ink particles, to the large charging voltage, and to change the deflection voltage, which is applied to the first deflection electrode which deflects the ink particles charged by the first charging electrode, to the large deflection voltage.

3. The inkjet recording device according to claim 1 ,
wherein the inkjet recording device has a print head structure in which the print results printed by the two nozzles are inclined in the same direction due to the printed object being moved.

4. The inkjet recording device according to claim 1 ,
wherein if the number of print dots per row differs between the two nozzles, print quality of one nozzle ejecting a small number of dots per row is improved, to the extent of difference in the number of dots per row between one nozzle and the other nozzle ejecting a large number of dots per row, by a control function for enlarging distances between travelling particles of dots used in one row of printing.

5. An inkjet recording device which has two sub-print heads, each of which includes a nozzle that forms ink particles by applying vibration to ink being ejected under pressure, a charging electrode for charging the ink particles, a deflection electrode for deflecting the charged ink particles, and a gutter for recovering ink particles not used in printing, in which two nozzles are disposed in a deflection direction of the ink particles, and which performs printing on a printed object while moving the printed object relative to the ink particles in a direction substantially perpendicular to the deflection direction of the ink particles,
wherein the inkjet recording device has a function for enlarging a clearance between print results, printed by the two nozzles, by controlling a voltage applied to the charging electrode and a voltage applied to the deflection electrode,
wherein one print content is printed by the two nozzles, and
wherein a charging voltage of a first charging electrode, which charges ink particles formed by a first nozzle of the two nozzles, which is disposed upstream in the deflection direction of the ink particles, is changed to a large charging voltage, and a deflection voltage, which is applied to a first deflection electrode which deflects the ink particles charged by the first charging electrode, is changed to a large deflection voltage, and thus a size of the one print content can be adjusted in a state where a space between a print result printed by the first nozzle and a print result printed by a second nozzle is fixed.

6. The inkjet recording device according to claim 5 ,
wherein the voltage applied to the charging electrode and the voltage applied to the deflection electrode are controlled to change the charging voltage of a second charging electrode, which charges ink particles formed by the second nozzle of the two nozzles, which is disposed downstream in the deflection direction of the ink particles, to the large charging voltage, and to change the deflection voltage, which is applied to a second deflection electrode which deflects the ink particles charged by the second charging electrode, to the large deflection voltage.

7. The inkjet recording device according to claim 5 ,
wherein the inkjet recording device has a print head structure in which the print results printed by the two nozzles are inclined in the same direction due to the printed object being moved.

8. The inkjet recording device according to claim 5 ,
wherein if the number of print dots per row differs between the two nozzles, print quality of one nozzle ejecting a small number of dots per row is improved, to the extent of difference in the number of dots per row between one nozzle and the other nozzle ejecting a large number of dots per row, by a control function for enlarging distances between travelling particles of dots used in one row of printing.

Assignees

• Hitachi Industry Equipment Systems Co Ltd

Inventors

• Takagishi Tsuneaki
• Kato Manabu
• KYU An

Classifications

• B41J2/025 Primary

  by vibration · CPC title

• B41J2/08 Primary

  charge-control type · CPC title

• B41J2002/022

  Control methods or devices for continuous ink jet · CPC title

• B41J2/13

  for inclination of printed pattern · CPC title

• B41J2/085

  Charge means, e.g. electrodes · CPC title