Adaptive ink flushing of a printer

Patent metadata

Field	Value
Publication number	US-10682857-B2
Application number	US-201816018501-A
Country	US
Kind code	B2
Filing date	Jun 26, 2018
Priority date	Jun 26, 2018
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

Systems and methods are provided for adaptive ink flushing of a printer. One embodiment is an apparatus that includes an adaptive ink flushing controller configured to obtain nozzle firing data for a nozzle of a printhead, to analyze the nozzle firing data to determine an inactive firing span of the nozzle, and, in response to determining that the inactive firing span of the nozzle exceeds a threshold, to transmit a firing instruction for ejecting ink.

First claim

What is claimed is:

1. An apparatus comprising:
an adaptive ink flushing controller configured to obtain nozzle firing data for a nozzle of a printhead, to analyze the nozzle firing data to determine an inactive firing span of the nozzle, and, in response to determining that the inactive firing span of the nozzle exceeds a threshold, to transmit a firing instruction for ejecting ink,
wherein the adaptive ink flushing controller is configured to determine the inactive firing span of the nozzle by counting between nozzle firings of the nozzle according to the nozzle firing data, and
wherein the adaptive ink flushing controller is configured to initialize a count to a first counting value, to advance the count for each increment of time or each time related event for which the nozzle does not eject ink, to reset the count to a second counting value if the nozzle firing data instructs the nozzle to activate prior to the count exceeding a threshold, and, if the count exceeds the threshold, to transmit the firing instruction for ejecting ink.

2. The apparatus of claim 1 wherein:
the adaptive ink flushing controller is configured to determine the second counting value based on a randomly distributed value of an average reset value of the nozzle.

3. The apparatus of claim 1 wherein:
the adaptive ink flushing controller is configured to determine the second counting value based on a size of one or more drops specified by the nozzle firing data of the nozzle.

4. The apparatus of claim 1 wherein:
the adaptive ink flushing controller is configured to receive an instruction to output a line flush in a page margin for a print job, and to decrease an instructed amount of ink of the line flush to be ejected by the nozzle for the line flush based on the inactive firing span.

5. The apparatus of claim 1 wherein:
the threshold is based on an ink type.

6. The apparatus of claim 1 further comprising:
an inkjet printer configured to receive and process the nozzle firing data.

7. A method comprising:
obtaining nozzle firing data for a nozzle of a printhead;
analyzing the nozzle firing data to determine an inactive firing span of the nozzle;
in response to determining that the inactive firing span of the nozzle exceeds a threshold, transmitting a firing instruction for ejecting ink;
determining the inactive firing span of the nozzle by counting between nozzle firings of the nozzle according to the nozzle firing data;
initializing a count to a first counting value;
advancing the count for each increment of time or each time related event for which the nozzle does not eject ink;
resetting the count to a second counting value if the nozzle firing data instructs the nozzle to activate prior to the count exceeding a threshold; and
if the count exceeds the threshold, transmitting the firing instruction for ejecting ink.

8. The method of claim 7 further comprising:
determining the second counting value based on a randomly distributed value of an average reset value of the nozzle.

9. The method of claim 7 further comprising:
determining the second counting value based on a size of one or more drops specified by the nozzle firing data of the nozzle.

10. The method of claim 7 further comprising:
receiving an instruction to output a line flush in a page margin for a print job;
tracking the inactive firing span of the nozzle during printing of the print job; and
decreasing an instructed amount of ink of the line flush to be ejected by the nozzle for the line flush based on the inactive firing span.

11. A non-transitory computer readable medium embodying programmed instructions which, when executed by a processor, are operable for performing a method comprising:
obtaining nozzle firing data for a nozzle of a printhead;
analyzing the nozzle firing data to determine an inactive firing span of the nozzle;
in response to determining that the inactive firing span of the nozzle exceeds a threshold, transmitting a firing instruction for ejecting ink;
determining the inactive firing span of the nozzle by counting between nozzle firings of the nozzle according to the nozzle firing data;
initializing a count to a first counting value;
advancing the count for each increment of time or each time related event for which the nozzle does not eject ink;
resetting the count to a second counting value if the nozzle firing data instructs the nozzle to activate prior to the count exceeding a threshold; and
if the count exceeds the threshold, transmitting the firing instruction for ejecting ink.

12. The medium of claim 11 wherein the method further comprises:
determining the second counting value based on a randomly distributed value of an average reset value of the nozzle.

13. The medium of claim 11 wherein the method further comprises:
determining the second counting value based on a size of one or more drops specified by the nozzle firing data of the nozzle.

14. The medium of claim 11 wherein the method further comprises:
receiving an instruction to output a line flush in a page margin for a print job;
tracking the inactive firing span of the nozzle during printing of the print job; and
decreasing an instructed amount of ink of the line flush to be ejected by the nozzle for the line flush based on the inactive firing span.

Assignees

• Ferreri Vincent William
• Kailey Walter F
• Ricoh Co Ltd

Inventors

• Ferreri Vincent William
• Kailey Walter F

Classifications

• B41J2002/1657

  Cleaning of only nozzles or print head parts being selected · CPC title

• B41J2/16526 Primary

  by applying pressure only · CPC title

• B41J2002/16573

  Cleaning process logic, e.g. for determining type or order of cleaning processes · CPC title

• B41J2/16579

  Detection means therefor, e.g. for nozzle clogging · CPC title

• B41J2/16585

  for paper-width or non-reciprocating print heads · CPC title