Printing apparatus and a method of controlling a printing apparatus including a control unit controlling a cleaning operation of a wiping unit wiping an ejection port surface

Patent metadata

Field	Value
Publication number	US-12472744-B2
Application number	US-202318340649-A
Country	US
Kind code	B2
Filing date	Jun 23, 2023
Priority date	Jul 11, 2022
Publication date	Nov 18, 2025
Grant date	Nov 18, 2025

Abstract

A printing apparatus including a print head ejecting ink, flowing from a first channel into a pressure chamber, from a nozzle, by driving an ejection energy generating element in the pressure chamber, a circulation pump circulates the ink in a circulation channel including the first channel, the pressure chamber, and a second channel that flows the ink from inside the pressure chamber to the outside, a wiping unit with a cleaning member that wipes an ejection port surface of an ejection port and a winding member that winds the cleaning member, and a control unit controls a cleaning operation in which the wiping unit wipes the ejection port surface. When the cleaning operation is performed after the circulation pump is stopped, the cleaning operation is changed based on an elapsed time from the time the circulation pump stopped driving, and the cleaning operation is controlled based on the elapsed time.

First claim

What is claimed is:

1 . A printing apparatus comprising:
a print head configured to eject ink, which has flowed from a first channel into a pressure chamber, from a nozzle, by driving an ejection energy generating element installed in the pressure chamber; a circulation pump configured to circulate the ink in a circulation channel including the first channel, the pressure chamber, and a second channel that flows the ink inside the pressure chamber to the outside of the pressure chamber; a wiping unit configured with a cleaning member that can wipe an ejection port surface of an ejection port and a winding member that winds the cleaning member; and a control unit configured to control a cleaning operation in which the wiping unit wipes the ejection port surface, so that, in a case when the cleaning operation is performed after the circulation pump is stopped, the cleaning operation is changed, based on an elapsed time from the time the circulation pump stopped driving, wherein, in a case when the elapsed time is equal to or less than a predetermined threshold value, the control unit causes the wiping unit to perform a first cleaning operation, in which the wiping unit is moved so as to wipe the ejection port surface while winding of the cleaning member is performed, and, in a case when the elapsed time is greater than the predetermined threshold vale, the control unit causes the wiping unit to perform a second cleaning operation, in which the wiping unit is moved so as to wipe the ejection port surface without the winding of the cleaning member.

2 . The printing apparatus according to claim 1 , wherein the cleaning operation includes a third cleaning operation, in which the wiping unit is moved at a first speed so as to wipe the ejection port surface without winding of the cleaning member, and a fourth cleaning operation, in which the wiping unit is moved at a second speed that is faster than the first speed so as to wipe the ejection port surface without the winding of the cleaning member.

3 . The printing apparatus according to claim 2 , wherein, in a case when the elapsed time is equal to or less than the predetermined threshold value, the control unit causes the wiping unit to perform the third cleaning operation, and, in a case when the elapsed time is greater than the predetermined threshold value, the control unit causes the wiping unit to perform the fourth cleaning operation.

4 . The printing apparatus according to claim 1 , wherein a winding length of the cleaning member is changed according to the elapsed time from the time the circulation pump stopped driving or whether the circulation pump is driven.

5 . The printing apparatus according to claim 1 , wherein the cleaning member is a sheet-like non-woven fabric.

6 . The printing apparatus according to claim 1 , wherein the wiping unit performs wiping in a direction parallel to or perpendicular to an ejection port array, which includes a plurality of ejection ports.

7 . The printing apparatus according to claim 1 , wherein the control unit further controls the cleaning operation, based on any of a frequency of wiping an ejection port array, an amount of adhering mist, an amount of image application, a distance between the ejection port surface and a print medium, and an environmental temperature.

8 . A method of controlling a printing apparatus including a print head configured to eject ink, which has flowed from a first channel into a pressure chamber, from a nozzle by driving an ejection energy generating element installed in the pressure chamber, a circulation pump configured to circulate the ink in a circulation channel including the first channel, the pressure chamber, and a second channel that flows the ink inside the pressure chamber to the outside of the pressure chamber, and a wiping unit configured with a cleaning member that can wipe an ejection port surface of an ejection port and a winding member that winds the cleaning member, the method comprising
a control step of controlling a cleaning operation in which the wiping unit wipes the ejection port surface, so that, in a case when the cleaning operation is performed after the circulation pump is stopped, the cleaning operation is changed based on an elapsed time from the time the circulation pump stopped driving, wherein, in a case when the elapsed time is equal to or less than a predetermined threshold value, the control unit causes the wiping unit to perform a first cleaning operation, in which the wiping unit is moved so as to wipe the ejection port surface while winding of the cleaning member is performed, and, in a case when the elapsed time is greater than the predetermined threshold vale, the control unit causes the wiping unit to perform a second cleaning operation, in which the wiping unit is moved so as to wipe the ejection port surface without the winding of the cleaning member.

Assignees

• Canon Kk

Inventors

• Takekoshi Rie
• Danzuka Toshimitsu
• Tomida Akihiro
• Aichi Akiko
• Ishimi Keita
• Kango Hiroto
• Yokozawa Taku
• Suzuki Kazuo

Classifications

• B41J2/17596 Primary

  Ink pumps, ink valves · CPC title

• B41J2002/1655

  with wiping surface parallel with nozzle plate and mounted on reels, e.g. cleaning ribbon cassettes · CPC title

• B41J2002/1657

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

• B41J2/16532

  by applying vacuum only · CPC title

• B41J2/16544

  Constructions for the positioning of wipers · CPC title