Incremental printing of symbolic information – Ink jet – Controller
Patent
1996-08-23
1998-09-29
Hilten, John S.
Incremental printing of symbolic information
Ink jet
Controller
347 5, 347 37, 400279, B41J 2938
Patent
active
058151729
ABSTRACT:
A method for controlling energizing of an ink jet printhead includes the steps of generating encoder pulses to a motor to activate the motor to move the printhead at a desired speed over a recording medium; generating and sending fire pulses at a fire pulse frequency from an ASIC to an ink jet printhead driver chip to selectively energize ink jet printhead nozzles to eject drops of ink onto the recording medium based on a predetermine relationship between an expected encoder pulse frequency and the fire pulse frequency; compensating for variations in the speed of the ink jet printhead movement caused by variations in the encoder pulse frequency by using the ASIC for continuously comparing the encoder pulse frequency to the fire pulse frequency and for adjusting the fire pulse frequency based upon the variations to the encoder pulse frequency to maintain the predetermined relationship thereby synchronizing the ink jet printhead movement with the energizing of the printhead nozzles.
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Hilten John S.
Pitney Bowes Inc.
Scolnick Melvin J.
Shapiro Steven J.
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