Patent ID: 8777396
Filing Date: 2014-07-15
Classification: B41J

Abstract:
1. A printer comprising: at least one printhead configured to eject aqueous ink; a rotating member being positioned to rotate in front of the at least one printhead to enable the at least one printhead to eject aqueous ink onto the surface of the rotating member and form an aqueous ink image on the surface of the rotating member; a first optical sensor and a second optical sensor, the first optical sensor being configured to generate image data of the surface of the rotating member at a first time, and the second optical sensor being configured to generate image data of the surface of the rotating member at a second time, one of the first time and the second time occurring later than the other of the first time and the second time, and both the first time and the second time occurring during a single print cycle; and a controller operatively connected to the first optical sensor and the second optical sensor, the controller being configured to receive from the first optical sensor and the second optical sensor image data of the surface of the rotating member at the first time and the second time, respectively, identify a parameter of at least one of the at least one printhead and the surface of the rotating member with reference to the image data received at the first time, and identify a parameter of the other of the at least one printhead and the surface of the rotating member with reference to the image data received at the second time.