Patent ID: 8292386
Filing Date: 2012-10-23
Classification: B41J

Abstract:
1. 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 detection portion that detects a rotational position of the drive roll, and that detects a timing at which the drive roll completes one rotation, by detecting a home mark disposed on the drive roll; and a control portion that controls, on the basis of the rotational position that the detection portion has detected, ejection timings at which the liquid droplet ejection heads eject the liquid droplets, so that when the drive roll reaches a predetermined rotational position, the control portion 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 liquid droplet ejection heads to start ejecting the liquid droplets in synchronization with the detection signal sent from the detection sensor, and the control portion controlling the timing at which the liquid droplet ejection heads start ejecting the ink droplets based on the timing of the detection by the detection portion, such that the ejection of the ink droplets is started when the home mark reaches the predetermined rotational position.