Patent ID: 9114608
Filing Date: 2015-08-25
Classification: B41J

Abstract:
1. An image formation apparatus configured to, when forming an image by ejecting ink from nozzles of an ink head onto a recording medium being conveyed on a conveyance path, control timing of ink ejection from each of the nozzles to cope with a conveyance airstream generated by the conveyance of the recording medium, the apparatus comprising an adjustment unit configured to adjust the ejection timing control on the basis of a self-produced airstream rate which is calculated based on a volume of ink ejected from the nozzle per unit time and indicates a generation rate of a self-produced airstream that causes the ink ejected from the nozzle to go straight against the conveyance airstream, a storage unit configured to store profile data in which the number of ink ejections from the nozzle per unit time and an amount of landing deviation of ink on the recording medium are associated with each other; and a judgment unit configured to judge whether or not the adjustment to the ejection timing control is needed, on the basis of a result of comparison between the volume of ink ejected from the nozzle per unit time and an ink ejection volume threshold corresponding to the self-produced airstream rate, wherein for the nozzle determined as needing the adjustment to the ejection timing control by the judgment unit, the adjustment unit calculates the number of ink ejections from the nozzle per unit time from the volume of ink ejected from the nozzle per unit time, determines an amount of landing deviation of ink corresponding to the calculated number of ink ejections on the basis of the profile data, and adjusts the ejection timing control using an adjustment content determined based on the self-produced airstream rate corresponding to the determined amount of landing deviation.