Patent ID: 9205691
Filing Date: 2015-12-08
Classification: B29C,B33Y,B41J

Abstract:
1. A three-dimensional object printer comprising: a platen; a printhead configured with ejectors to eject drops of material towards the platen to form columns of material on the platen; an optical sensor configured to generate data corresponding to a height of the columns of the material on the platen at a plurality of locations on the platen; and a controller operatively connected to the optical sensor and the printhead, the controller being configured to generate raster image data for forming a test pattern on the platen having a plurality of columns of material, to operate the printhead to eject drops of material towards the platen with reference to the raster image data for the test pattern to form columns of material on the platen, each column of material corresponding to only one ejector in the printhead, and to modify firing signal parameters for at least one ejector with reference to a measured difference in height between the column of material in the test pattern formed by the at least one ejector and a height corresponding to raster data used to operate the at least one ejector to form the column of material with the at least one ejector in the test pattern to compensate for variations in a volume for the drops of material ejected by the at least one ejector and volumes of drops of material ejected by the other ejectors in the printhead ejecting material.