US 11,794,479 B2
Inkjet printing apparatus and recovery method
Takahiro Kiuchi, Fuchu (JP); Noriko Sato, Kawasaki (JP); Hiroshi Nakai, Sagamihara (JP); Takashi Sasaki, Yokohama (JP); Takatoshi Nakano, Yokohama (JP); Atsushi Takahashi, Tama (JP); Takuya Fukasawa, Yokohama (JP); and Yoshinori Nakagawa, Kawasaki (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Apr. 26, 2022, as Appl. No. 17/729,809.
Application 17/729,809 is a division of application No. 16/564,512, filed on Sep. 9, 2019, granted, now 11,345,154.
Claims priority of application No. 2018-189626 (JP), filed on Oct. 5, 2018.
Prior Publication US 2022/0250386 A1, Aug. 11, 2022
Int. Cl. B41J 2/165 (2006.01)
CPC B41J 2/16523 (2013.01) [B41J 2/16535 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A printing apparatus comprising:
a printing unit having an ejection opening surface on which multiple ejection openings configured to eject liquid are arrayed;
a wiping unit capable of wiping the ejection opening surface by moving in a predetermined direction relative to the ejection opening surface;
a suction unit connected to the wiping unit and configured to apply negative pressure to the ejection opening surface;
a cap configured to cap the ejection opening surface;
a tank connected between the wiping unit and the suction unit and configured to be depressurized by the suction unit;
a pressure detection unit configured to detect a pressure value of the pressure inside the tank; and
a control unit configured to perform suction wiping operation by wiping the ejection opening surface with the wiping unit while driving the suction unit to apply negative pressure to the ejection opening surface,
wherein the suction wiping operation is performed in a case where an elapsed time in an uncapped state, which is not for printing, exceeds a threshold,
wherein before starting the suction wiping operation, the control unit drives the suction unit until a pressure value detected by the pressure detection unit reaches a first negative pressure value with the wiping unit in contact with a suction preparation surface that is part of the ejection opening surface and on which the ejection openings are not arrayed.