US Patent 9981492 Image Forming Apparatus

In order to provide an image forming apparatus which can reduce color deviation at the time of forming an image on a medium, the present printing apparatus comprises an image forming unit which forms an image by superimposing images, each formed with corresponding color of ink, on a transfer film while heating a thermal head, a film conveying device which conveys a transfer film, a sensor which detects a stretch of the transfer film occurring due to heating with the thermal head, a controller which controls the image forming unit to change a line cycle of the thermal head in accordance with a stretch of the transfer film detected by the sensor.