The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 29, 1998
Filed:
Aug. 23, 1996
Sungwon R Moh, Wilton, CT (US);
Pitney Bowes, Inc., Stamford, CT (US);
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.