Patent ID: 6823877
Filing Date: 2004-11-30
Classification: B41J

Abstract:
A liquid ejection apparatus connected to an external device, comprising:a liquid ejection head, operable to eject liquid droplets therefrom; a liquid container, which contains liquid to be supplied to the liquid ejection head; a timer, which acquires data indicating a current time from the external device, converts the acquired data into a first value having a data amount smaller than the acquired data, and performs cyclic clocking in which a first predetermined time period is repetitively clocked from a predetermined time point; a nonvolative storage medium, which stores a second time value indicating a time at which a maintenance operation is lastly performed, the nonvolatile storage medium being disposed on the liquid container; and a determinant, which compares the first value and the second time values to obtain a third time value, and determines whether a maintenance operation is necessary to be performed based on the third time value.