| 摘要 |
When a predetermined time T1ref has elapsed from performance of a previous cleaning, all nozzles in a nozzle row as an inspection target are driven at a drive frequency of a maximum frequency so that an air bubble in a filter chamber is crushed against a filter by increasing the flow rate in the filter chamber of an ink needle which connects an ink cartridge and a head, and a nozzle inspection to determine whether or not a nozzle defect is occurred is performed repeatedly until the nozzle defect occurs at a predetermined time interval T2ref (every week, for example) and, when the nozzle defect occurs, cleaning for ejecting the air bubble in the filter chamber to the outside is performed.
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