Printing apparatus having an ejection unit forming an image on a print medium by ejecting liquid from an ejection port

A printing apparatus comprising:

• an ejection unit configured to perform a print operation of forming an image on a print medium by ejecting liquid from an ejection port by using drive of an ejection energy generation element provided in a pressure chamber, the liquid flowing into the pressure chamber from a first flow passage;
• a sensor configured to detect temperature of the ejection unit;
• a circulation unit configured to circulate the liquid in a circulation flow passage including the first flow passage, the pressure chamber, and a second flow passage configured to allow the liquid in the pressure chamber to flow to an outside of the pressure chamber;
• a recovery unit configured to performs a recovery operation of the ejection unit;
• and
• a control unit configured to set a wait time from completion of the print operation to execution of the recovery operation depending on the temperature of the ejection unit detected by the sensor, and to execute the recovery operation by the recovery unit in a case when an elapsed time from the completion of the print operation exceeds the wait time.

A printing apparatus comprising:

• an ejection unit configured to perform a print operation of forming an image on a print medium by ejecting liquid from an ejection port by using drive of an ejection energy generation element provided in a pressure chamber, the liquid flowing into the pressure chamber from a first flow passage;
• a sensor configured to detect temperature of the ejection unit;
• a circulation unit configured to circulate the liquid in a circulation flow passage including the first flow passage, the pressure chamber, and a second flow passage configured to allow the liquid in the pressure chamber to flow to an outside of the pressure chamber;
• a recovery unit configured to perform a recovery operation of the ejection unit;
• a control unit configured to control an execution timing of the recovery operation by the recovery unit;
• and
• an adjustment unit configured to adjust the temperature of the ejection unit such that the temperature at the completion of the print operation is target temperature.

A printing apparatus comprising:

• an ejection unit configured to perform a print operation of forming an image on a print medium by ejecting liquid from an ejection port by using drive of an ejection energy generation element provided in a pressure chamber, the liquid flowing into the pressure chamber from a first flow passage;
• a circulation unit configured to circulate the liquid in a circulation flow passage including the first flow passage, the pressure chamber, and a second flow passage configured to allow the liquid in the pressure chamber to flow to an outside of the pressure chamber;
• a wiping unit configured to perform a wiping operation of wiping an ejection port surface on which the ejection port of the ejection unit is provided;
• and
• a control unit configured to control preliminary ejection of the liquid performed by the ejection unit to recover an ejection performance of the ejection port, based on a flow velocity of the liquid in the circulation flow passage at start of the wiping operation.