Patent ID: 9656463
Date: 2017-05-23
CPC Classifications: B41J

Claim:
1. A system comprising: at least one inkjet printhead fluidly coupled to an ink input supply; a controller configured to direct the at least one inkjet printhead to eject drops of ink of multiple ink drop types; memory configured to store a size value for each the multiple ink drop types that represents a directed ink drop size to eject, wherein the size value is different for each of the multiple ink drop types; an ink output estimator configured to estimate an ink output amount ejected from the at least one inkjet printhead based on an estimated quantity of each of the multiple ink drop types ejected from the at least one printhead and the size value of each of the multiple ink drop types; an ink measurement device configured to measure an ink input amount provided by the ink input supply to the at least one inkjet printhead; and a correction module configured to compare the ink input amount with the ink output amount for a printing operation, to detect an error in the size value for at least one of the multiple ink drop types based on a discrepancy in the comparison between the ink input amount from the ink input supply and the ink output amount from the estimated quantity and the size value of each of the multiple ink drop types, and to adjust the size value in the memory for the at least one of the multiple ink drop types based on the discrepancy.