| 摘要 |
PROBLEM TO BE SOLVED: To conserve the consumption quantity of ink for restoring nozzle function used when printing inferiority is generated. SOLUTION: A nozzle restoring switch 15 and a changeover switch 20 changed over by opening and closing the unit lid of an ink tank unit are provided to a nozzle restoring circuit. When the nozzle restoring switch 15 is operated in such a state that the unit lid is closed when slight printing inferiority is generated, a head operating circuit Ch injecting restoring ink from a nozzle is selected by the operation control circuit 29 of a printing head and, when heavy printing inferiority is generated, the unit lid is opened to operate the nozzle restoring switch 15 and a pump driving circuit Cp driving a nozzle restoring pump 24 to forcibly discharge the restoring ink from a nozzle is selected. A nozzle function restoring means can be selected according to the degree of printing inferiority and the wasteful consumption of ink can be suppressed. |
