US 2011/0298849 A1 · INKJET PRINTING APPARATUS

Abstract

In a line-head type inkjet printing apparatus that ejects a plurality of types of inks, an inkjet printing apparatus is provided in which the change of its ejection properties different depending on the type of ink is prevented from occurring. The line-head type printing apparatus includes an acquisition unit that counts the ejection number of liquid from each of print heads in each of a plurality of print heads. Furthermore, the printing apparatus compares the ejection number of liquid from each of the print heads counted by the acquisition unit with a threshold value set for each of the print heads. The printing apparatus includes a change unit that can move a holder in the main scanning direction when the counted ejection number of liquid exceeds the threshold value set for the print head.

Claims9

Dependent claims

An inkjet printing apparatus comprising:

a printing unit configured to use a plurality of print heads for ejecting respective different inks and perform printing on a print medium by ejecting ink from part of a plurality of ejection ports included in said print heads;
an acquisition unit configured to acquire an accumulative ejection number of ink every predetermined number of ejection ports in at least one of said plurality of print heads;
and
a change unit configured to change a range of use of ejection ports of at least one print head when a value relating to said accumulative ejection number in a range of use of ejection ports of the at least one print head for performing the printing on the print medium is greater than a predetermined threshold value.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

12/964,085Filed 9 Dec 2010

Priority

JP 2010-1280473 Jun 2010

Published

8 Dec 2011

Term ends

Not estimatedThe source records don’t support an estimate.

Classification4 codes

B41J 25/001
Actions or mechanisms not otherwise provided for: mechanisms for bodily moving print heads or carriages parallel to the paper surface
B41J 2/2146
Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding: for line print heads
B41J 2002/17569
Ink level or ink residue control: based on the amount printed or to be printed
B41J
Typewriters

Inkjet printing apparatus

Life of this patent

Inkjet printing apparatus

Life of this patent

Abstract

Claims9