Ink jet recording apparatus

An ink jet recording apparatus comprising:

• a recording unit configured to execute a recording operation of an image and on which nozzle arrays each including a plurality of nozzles for ejecting ink onto a recording medium are arranged;
• a cap configured to receive ink preliminarily ejected from the recording unit;
• a control unit configured to control an ejection operation of ink ejected from the recording unit in response to receipt of a recording command;
• and
• a determination unit configured to determine whether an image length included in the recording command is greater than a predetermined threshold value,
• wherein, in a case where the recording command includes an instruction for recording the image by using a second nozzle group different from a first nozzle group without using the first nozzle group among the plurality of nozzles and the determination unit determines that the image length is greater than the predetermined threshold value, a number of droplets ejected from the first nozzle group in a first preliminary ejection executed prior to the recording operation of the image is less than a number of droplets ejected from the second nozzle group in a second preliminary ejection executed prior to the recording operation of the image.

An ink jet recording apparatus comprising:

• a recording unit configured to execute a recording operation of an image and on which nozzle arrays each including a plurality of nozzles for ejecting ink onto a recording medium are arranged;
• a cap configured to receive ink preliminarily ejected from the recording unit;
• a control unit configured to control an ejection operation of ink ejected from the recording unit in response to receipt of a recording command;
• a calculation unit configured to calculate an amount of ink stored in the cap based on at least any one of a number of recording passes, a number of scans necessary to record an image, a number of droplets ejected in a preliminarily ejection, and an image length, included in the recording command;
• and
• a determination unit configured to determine whether the amount of ink calculated by the calculation unit is greater than a predetermined threshold value,
• wherein, in a case where the recording command includes an instruction for recording the image by using a second nozzle group different from a first nozzle group without using the first nozzle group among the plurality of nozzles and the determination unit determines that the amount of ink is greater than the predetermined threshold value, a number of droplets ejected from the first nozzle group in a first preliminary ejection executed prior to the recording operation of the image is less than a number of droplets ejected from the second nozzle group in a second preliminary ejection executed prior to the recording operation of the image.