Patent ID: 7604341

Claim:
A liquid droplet ejection apparatus comprising: a conveyor portion that conveys a recording medium to a liquid droplet ejection region by the rotational force of a drive roll that rotates/drives; liquid droplet ejection heads that record an image by ejecting liquid droplets onto the recording medium conveyed to the liquid droplet ejection region by the conveyor portion; a feed portion that feeds the recording medium to the conveyor portion at a predetermined feed timing; a detection portion that detects a rotational position of the drive roll; and a control portion that controls the feed timing of the feed portion on the basis of the rotational position that the detection portion has detected, so that when the drive roll reaches a predetermined rotational position, the control portion causes the recording medium to be conveyed to the liquid droplet ejection region and causes the liquid droplet ejection heads to start ejecting the liquid droplets onto the recording medium; the detection portion including a detection sensor that detects the rotational position of the drive roll and sends a detection signal to the control portion, and the control portion causing the feed portion to feed the recording medium in synchronization with the detection signal sent from the detection sensor.