Inkjet printer

Patent metadata

Field	Value
Publication number	US-11845273-B2
Application number	US-202017764254-A
Country	US
Kind code	B2
Filing date	Aug 31, 2020
Priority date	Oct 10, 2019
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

The purpose of the present invention is to prevent the flow of air flowing from the outside of a cover part into the cover part via an ink droplet passing hole as air accompanying printing droplets outflows. An inkjet recording device is provided with: a recording mechanism (printing mechanism) having an ink room 101 that ejects an ink column 107 , charging electrodes 103 A and 103 B that charge ink droplets 106 generated from the ink column 107 , and deflection electrodes 105 A and 105 B that deflect charged ink droplets 106 A; and a cover part 118 that has an ink droplet passing hole 117 through which the ink droplets 106 A deflected by the deflection electrodes 105 A and 105 B pass and covers the recording mechanism. The inkjet recording device causes the ink droplets 106 A to land onto a recording object 116 that moves relative to a recording head 100 to perform recording. A vent hole 130 is provided in a lateral surface of the cover part 118.

First claim

The invention claimed is:

1. An inkjet printer comprising a recording head,
the recording head including:
a recording mechanism having an ink chamber that ejects an ink column, a charge electrode that electrically charges ink droplets generated from the ink column, a deflection electrode that deflects the electrically charged ink droplets; and
a cover portion that has an ink droplet passing hole through which the ink droplets deflected by the deflection electrode pass and covers the recording mechanism,
the inkjet printer making the ink droplets land onto a recording object moving relative to the recording head to execute recording,
wherein a vent is provided to a side surface of the cover portion; and
a shield plate is provided inside the cover portion to prevent an airflow flowing in from the vent from directly impinging ink droplets.

2. The inkjet printer according to claim 1 wherein
the side surface of the cover portion is a surface formed from a bottom surface opposing the recording object in a direction away from the recording object.

3. The inkjet printer according to claim 2 wherein
the side surface of the cover portion is formed as a perpendicular surface to a relative movement direction of the recording object.

4. The inkjet printer according to claim 3 wherein
the vent has a perpendicular opening surface to a relative movement direction of the recording object.

5. The inkjet printer according to claim 3 wherein
the cover portion has, as the side surfaces, two side surfaces located to opposite sides of the recording mechanism in a relative movement direction of the recording object.

6. The inkjet printer according to claim 1 wherein
a fairing projected from the side surface of the cover portion is provided to an entrance of the vent in parallel to a movement direction of the recording object.

7. The inkjet printer according to claim 6 wherein
the fairing is arranged in a tapered shape at an entrance of the vent.

8. The inkjet printer according to claim 1 wherein
the shield plate is inclined relative to a direction of an airflow flowing in from the vent.

9. The inkjet printer according to claim 1 wherein
an area of the vent has a size equal to or more than an opening area of the ink droplet passing hole.

Assignees

• Hitachi Ltd

Inventors

• Ishii Eiji
• Sato Koma
• KISANUKI Shoichiro

Classifications

• B41J2/09 Primary

  Deflection means · CPC title

• B41J2/04576

  controlling heads of electrostatic type · CPC title

• B41J2/085 Primary

  Charge means, e.g. electrodes · CPC title

• B41J2/08

  charge-control type · CPC title

• B41J2/07

  characterised by jet control (B41J2/205 takes precedence) · CPC title