| 摘要 |
An ink-jet printer has a tank holding ink therein, an ink-jet printing head for printing on a paper sheet, an ink cartridge for holding a supply ink, electrodes for detecting an ink level in the tank, a feeder for feeding the ink in the ink cartridge to the tank when the electrodes detect that the ink level in the tank is below a predetermined level, a timer circuit for allowing the feeder to supply an extra amount of ink to the tank even after the ink level reaches a normal level, and a warning device for warning the operator if the ink level is not recovered to the normal level within a predetermined period of time after the feeder is operated.
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