Patent ID: 8136906

Claim:
An image recording apparatus which records an image with respect to a recording medium, comprising: a recording head which has a plurality of nozzles that eject an ink and a common ink chamber that communicates with the plurality of nozzles; an upstream-side ink path which is connected with the recording head and through which the ink is supplied to the common ink chamber; a downstream-side ink path which is connected with the recording head and through which the ink is discharged from the common ink chamber; an ink path which annularly connects the upstream-side ink path, the common ink chamber, and the downstream-side ink path and through which the ink is circulated; an upstream-side temperature gauge which is installed in the upstream-side ink path; a downstream-side temperature gauge which is installed in the downstream-side ink path; and a maintenance unit which executes maintenance processing involving ejection of the ink from the nozzles to restore ink ejection performance in the recording head, wherein a control unit estimates a temperature of the recording head based on an output from the upstream-side temperature gauge and an output from the downstream-side temperature gauge and calculates an ink waste amount ejected from the nozzles by the maintenance processing based on the estimated temperature of the recording head and execution contents of the maintenance processing.