Printing apparatus

Patent metadata

Field	Value
Publication number	US-2020047524-A1
Application number	US-201916519024-A
Country	US
Kind code	A1
Filing date	Jul 23, 2019
Priority date	Aug 13, 2018
Publication date	Feb 13, 2020
Grant date	—

Abstract

A printing apparatus is provided and includes: a platen that supports a medium; an inkjet head provided to face the medium, the inkjet head ejecting an ink containing a charge controlling agent toward the medium by driving a drive element to land the charged ink droplet, which becomes a polarity of one of the positive polarity and the negative polarity, on the medium; and a voltage applying part that applies to at least one of the platen and the medium to have the other polarity of the positive polarity and the negative polarity.

First claim

What is claimed is:

1 . A printing apparatus comprising:
an ejection head provided to face a medium, the ejection head ejecting an ink containing a charge controlling agent toward the medium as a charged ink droplet to land the charged ink droplet on the medium; and a polarity applier that applies polarity to the medium to have an opposite polarity with respect to a polarity of the charged ink droplet.

2 . The printing apparatus according to claim 1 , wherein
the polarity applier comprises: a first charger, provided to face the medium before the charged ink droplet lands on the medium, the first charger charging the medium to the opposite polarity from the charged ink droplet.

3 . A printing apparatus comprising:
a mounting portion on which a medium is placed; an ejection head provided to face the medium, the ejection head ejecting an ink containing a charge controlling agent toward the medium as a charged ink droplet to land the charged ink droplet on the medium; and a polarity applier that applies polarity to the mounting portion to have an opposite polarity with respect to a polarity of the charged ink droplet.

4 . The printing apparatus according to claim 3 , wherein
the polarity applier comprises: a voltage applying part that applies a voltage between a conductive portion provided in the ejection head and the mounting portion to be conductive to generate an electric field between the ejection head and the mounting portion, thus increasing an abutment force between the medium and the charged ink droplet.

5 . A printing apparatus comprising:
an ejection head provided to face a medium, the ejection head ejecting an ink containing a charge controlling agent toward the medium as a charged ink droplet to land the charged ink droplet on the medium; and a polarity applier that applies polarity to a side of the ejection head to have the same polarity as a polarity of the charged ink droplet.

6 . The printing apparatus according to claim 5 , wherein
the polarity applier comprises: a second charger, provided to face the medium on which the charged ink droplet landed, the second charger charging the medium to the same polarity as the charged ink droplet.

7 . The printing apparatus according to claim 2 , wherein
the first charger is a shield type corona ion charger that generates ions by corona discharge.

8 . The printing apparatus according to claim 6 , wherein
the second charger is a shield type corona ion charger that generates ions by corona discharge.

9 . The printing apparatus according to claim 1 , further comprising:
a neutralizer that neutralizes the charged ink droplet and the medium after printing.

10 . The printing apparatus according to claim 2 , further comprising:
a neutralizer that neutralizes the charged ink droplet and the medium after printing.

11 . The printing apparatus according to claim 3 , further comprising:
a neutralizer that neutralizes the charged ink droplet and the medium after printing.

12 . The printing apparatus according to claim 4 , further comprising:
a neutralizer that neutralizes the charged ink droplet and the medium after printing.

13 . The printing apparatus according to claim 5 , further comprising:
a neutralizer that neutralizes the charged ink droplet and the medium after printing.

14 . The printing apparatus according to claim 6 , further comprising:
a neutralizer that neutralizes the charged ink droplet and the medium after printing.

15 . The printing apparatus according to claim 7 , further comprising:
a neutralizer that neutralizes the charged ink droplet and the medium after printing.

16 . The printing apparatus according to claim 8 , further comprising:
a neutralizer that neutralizes the charged ink droplet and the medium after printing.

Assignees

• Mimaki Eng Co Ltd

Inventors

• Ohnishi Masaru

Classifications

• B41J2/085

  Charge means, e.g. electrodes · CPC title

• B41J2002/022

  Control methods or devices for continuous ink jet · CPC title

• B41J11/0015 Primary

  for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing (selective coating B41J2/2114) · CPC title