Liquid ejection apparatus

A liquid ejection apparatus comprising:

• a liquid ejection head having a nozzle configured to eject liquid;
• a signal output circuit configured to, when inspection driving is performed by the liquid ejection head, output a determination signal indicating whether the nozzle is an abnormal nozzle, the inspection driving being driving the liquid ejection head to eject liquid from the nozzle for checking whether the nozzle is the abnormal nozzle;
• a recovery device configured to perform a recovery operation of discharging liquid from the nozzle;
• a temperature sensor configured to output a temperature signal indicating a temperature;
• a memory;
• and
• a controller configured to:
• in response to receiving a first signal, perform the inspection driving and, in response to determining that the determination signal transmitted from the signal output circuit indicates that the abnormal nozzle exists, store flag information in the memory, the flag information indicating that the recovery operation needs to be performed;
• in response to receiving a second signal different from the first signal and determining that the memory stores the flag information, control the recovery device to perform the recovery operation;
• perform the inspection driving in a state where the temperature indicated by the temperature signal is in a first temperature range;
• and
• again perform the inspection driving in response to determining that the temperature indicated by the temperature signal changes from a temperature in the first temperature range to a temperature in a second temperature range different from the first temperature range.

A liquid ejection apparatus comprising:

• a liquid ejection head having a nozzle configured to eject liquid,
• wherein the liquid ejection head has a plurality of nozzles each configured to eject liquid, the plurality of nozzles including the nozzle;
• a signal output circuit configured to, when inspection driving is performed by the liquid ejection head, output a determination signal indicating whether the nozzle is an abnormal nozzle, the inspection driving being driving the liquid ejection head to eject liquid from the nozzle for checking whether the nozzle is the abnormal nozzle;
• a recovery device configured to perform a recovery operation of discharging liquid from the nozzle;
• a memory;
• and
• a controller configured to:
• in response to receiving a first signal, perform the inspection driving and, in response to determining that the determination signal transmitted from the signal output circuit indicates that the abnormal nozzle exists, store flag information in the memory, the flag information indicating that the recovery operation needs to be performed;
• in response to receiving a second signal different from the first signal and determining that the memory stores the flag information, control the recovery device to perform the recovery operation;
• in a case where a number of the abnormal nozzle is smaller than or equal to a threshold, perform a first type of the recovery operation in which a first amount of liquid is discharged;
• and
• in a case where the number of the abnormal nozzle is larger than the threshold, perform a second type of the recovery operation in which a second amount of liquid is discharged, the second amount being larger than the first amount.

A liquid ejection apparatus comprising:

• a liquid ejection head having a nozzle configured to eject liquid;
• a signal output circuit configured to, when inspection driving is performed by the liquid ejection head, output a determination signal indicating whether the nozzle is an abnormal nozzle, the inspection driving being driving the liquid ejection head to eject liquid from the nozzle for checking whether the nozzle is the abnormal nozzle;
• a recovery device configured to perform a recovery operation of discharging liquid from the nozzle;
• a memory;
• and
• a controller configured to:
• receive a first signal different from a print instruction by a user;
• in response to receiving the first signal, perform the inspection driving and, in response to determining that the determination signal transmitted from the signal output circuit indicates that the abnormal nozzle exists, store flag information in the memory, the flag information indicating that the recovery operation needs to be performed;
• after storing the flag information in the memory, receive a second signal that is the print instruction by the user;
• and
• in response to receiving the second signal and determining that the memory stores the flag information, control the recovery device to perform the recovery operation.

A liquid ejection apparatus comprising:

• a liquid ejection head having a nozzle configured to eject liquid;
• a signal output circuit configured to, when inspection driving is performed by the liquid ejection head, output a determination signal indicating whether the nozzle is an abnormal nozzle, the inspection driving being driving the liquid ejection head to eject liquid from the nozzle for checking whether the nozzle is the abnormal nozzle;
• a recovery device configured to perform a recovery operation of discharging liquid from the nozzle;
• a clock configured to keep time of day,
• a memory configured to store time information indicating a particular time of day;
• and
• a controller configured to:
• in response to receiving a first signal that the time of day indicated by the clock reaches the particular time of day indicated by the time information stored in the memory, perform the inspection driving and, in response to determining that the determination signal transmitted from the signal output circuit indicates that the abnormal nozzle exists, store flag information in the memory, the flag information indicating that the recovery operation needs to be performed;
• and
• in response to receiving a second signal different from the first signal and determining that the memory stores the flag information, control the recovery device to perform the recovery operation.