Patent ID: 8205955

Claim:
An image recording apparatus comprising: a conveyance path; a conveyance roller which conveys the recording medium through the conveyance path in a conveyance direction; a drive source for rotating the conveyance roller; a synchronous shaft which rotates in synchronization with the conveyance roller; a rotation amount detector which detects a rotation amount of the synchronous shaft; a print head which executes an image recording on the recording medium conveyed by the conveyance roller; a carriage which, being mounted with the print head, moves in a movement direction intersecting the conveyance direction, the carriage including an abutment portion; a carriage position detector which detects a position of the carriage in the movement direction; a rotating body which rotates in synchronization with the conveyance roller, the rotating body including a reference portion which protrudes or depresses in the movement direction at a predetermined rotation phase of the rotating body; and an origin determination section which moves the abutment portion of the carriage to a detection position where the reference portion of the rotating body can make abutment with the abutment portion, drives the drive source to rotate the conveyance roller and the rotating body, and, based on a result of the detection by the carriage position detector, determines an origin position of a rotation phase of the conveyance roller.