Abstract: An ink jet recording apparatus includes a cap, a control unit, and a recording unit having nozzle arrays each including a plurality of nozzles for ejecting ink in an image recording operation. The cap receives ink preliminarily ejected from the recording unit. The control unit controls an ejection operation to eject ink in response to receiving a recording command to cause an amount of ink ejected from a first nozzle group in a first preliminary ejection executed prior to the recording operation of the image to be smaller than an amount of ink ejected from a second nozzle group different from the first nozzle group in a second preliminary ejection executed prior to the recording operation of the image in a case where the recording command includes an instruction for recording the image by using the second nozzle group without using the first nozzle group among the plurality of nozzles.

Abstract: The amount of ink in a cap at the time of end of printing initiated by a print command is estimated, and it is determined whether an open suction action is to be performed based on the estimated post-printing ink amount to prevent spillover of the ink and reduce downtime due to the open suction action.

Abstract: An inkjet printing apparatus includes a print head including a plurality of nozzles, a cap, and a storing unit, and a control unit. The control unit controls the print head to start and perform an intra-standby preliminary discharge operation where a preliminary discharge operation to discharge ink into a cap is performed at predetermined time intervals during a standby period after the print head finishes a printing operation to print an image, continue the intra-standby preliminary discharge operation if an accumulated value of an amount of ink stored in a storing unit during the preliminary discharge operation is not greater than a threshold value, stop the intra-standby preliminary discharge operation if the stored accumulated value of the amount of ink is greater than the threshold value, and bring the print head into contact with the cap and terminating the standby period if the standby period exceeds a predetermined time period.