Patent ID: 8333465
Filing Date: 2012-12-18
Classification: B41F,B41J

Abstract:
1. A roll-to-roll printing system, comprising: a printing roller unit having pluralities of droplet-ejecting inkjet heads arranged at the outer circumferential portion thereof, each of the droplet-ejecting inkjet heads comprising a body, a chamber formed in the body so as to receive a given amount of fluid, a nozzle for ejecting the fluid, formed at one side of the body so as to communicate with the chamber, and an actuator for forming an electrostatic field so as to eject the fluid through the nozzle; a transport roller unit comprising upper rollers, which rotate so as to feed a print medium into a space above the printing roller unit, and lower rollers, which rotate so as to feed the print medium into a space below the printing roller unit; a print medium sensor unit comprising a position sensor for sensing the position of the print medium, which is fed into each of the spaces above and below the printing roller unit by the upper rollers and the lower rollers, a feed speed sensor for sensing the feed speed of the print medium, which is fed into each of the spaces above and below the printing roller unit by the upper rollers and the lower rollers, and a vibration sensor for sensing the vibration of the print medium, which is fed into each of the spaces above and below the printing roller unit by the upper rollers and the lower rollers; a roller sensor unit comprising a print roller sensor for sensing the rotating speed of the printing roller unit, an upper roller sensor for sensing the rotating speed of the upper rollers, and a lower roller sensor for sensing the rotating speed of the lower rollers; and a control unit for controlling the rotation of the printing roller unit, the upper rollers and the lower rollers on the basis of the information sensed in the print medium sensor unit and the roller sensor unit.