EVALUATING PRINT HEAD NOZZLE CONDITION

摘要

The present subject matter relates to evaluating print head nozzle condition of a plurality of nozzle columns. Each of the plurality of nozzle columns comprises a set of nozzles. A plurality of drive bubble detect modules are activated, by a timing circuit coupled to each of the plurality of nozzle columns upon occurrence of at least a first predetermined time instant and a second predetermined time instant. For each of the plurality of nozzle columns, test results for a nozzle of the nozzle column are registered by the corresponding drive bubble detect module. Test results obtained based on impedances measured across a nozzle associated with the nozzle column corresponding to a drive bubble detect module are registered by the drive bubble detect module at the first predetermined time instant and the second predetermined time instant. The print head nozzle condition of the nozzle is evaluated based on the test results.

主权项

1. A method for evaluating print head nozzle condition of a plurality of nozzle columns, wherein each of the plurality of nozzle columns comprises a respective set of nozzles, the method comprising:
activating, by a timing circuit coupled to each of the plurality of nozzle columns, a plurality of drive bubble detect modules at a first predetermined time instant and a second predetermined time instant, wherein each of the plurality of drive bubble detect modules is coupled to a corresponding nozzle column from among the plurality of nozzle columns; for each of the plurality of nozzle columns, registering by the corresponding drive bubble detect module, test results for a nozzle of the nozzle column, wherein the test results are obtained based on impedances measured across the nozzle at the first predetermined time instant and the second predetermined time instant; and evaluating the print head nozzle condition of the nozzle based on the test results.