Patent ID: 6179419
Filing Date: 2001-01-30
Classification: B41J

Abstract:
An inkjet printing apparatus which moves a media sheet along a media path and marks the media sheet with ink, comprising:an inkjet printhead having a plurality of inkjet nozzles which eject ink onto a portion of the media sheet located within a print zone, the print zone located adjacent to the plurality of nozzles;a endless loop belt having an outer surface upon which the media sheet rests as the media sheet passes along the media path through the print zone;a drive shaft coupled to the belt which moves the belt in a closed loop;a motor coupled to the drive shaft which spins the drive shaft to move the belt;a sensor which detects drive shaft position, and in response generates a feedback signal which is coupled to the motor to correct for position errors and to provide accurate closed loop control of media advance along the belt; anda controller which receives the feedback signal and in response generates a control signal input to the motor, wherein the control signal is derived from at least the feedback signal and a belt characteristic.