Patent ID: 7552679

Claim:
A printer which prints in sequence on a print medium transported by an endless belt looped over a plurality of rollers using a plurality of printer heads disposed at different locations along a transport direction of the print medium, comprising: a data generating section which generates print data for use to make the printer heads do printing; a meander detecting section which can detect meandering of the print medium by checking for meandering of the endless belt; and a head control section which moves the printer heads based on the meandering detected by meander detecting section and the print data generated by the data generating section, wherein: the meander detecting section comprises a marking section which can place marks in predetermined locations of the endless belt; and a mark meander detecting section which can detect meandering of the endless belt right under each printer head by checking for meandering of the placed marks, and wherein: the marking section can continuously eject ink droplets to a width-direction end of the endless belt while the endless belt is rotating and the mark meander detecting section can detect meandering of the ink droplets right under each printer head while moving in the transport direction after the endless belt is stopped.