| 摘要 |
An ink jet printer having a print head and connected to a host computer from which imaging data is transmitted to the printer. The printer has a purging mechanism for purging the print head. The host computer has a clock driven by a storage battery or an uninterruptible power supply. The host computer computes a period as a second period by subtracting a completion timing of the latest purging operation from a present time provided by the clock. The ink jet printer stores a first period starting at an electrical power supply timing with respect to the printer or at the operation timing of the purging mechanism after the electrical power supply. If no purging operation has been performed after the electrical power supply, the second period is compared with a predetermined period. If the second period is longer than the predetermined period, purging operation is performed. If purging operation has been performed after the electrical power supply, the first period is compared with the predetermined period. If the first period is longer than the predetermined period, the purging operation is again performed.
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