Patent ID: 6746100
Filing Date: 2004-06-08
Classification: B41J

Abstract:
An ink jet recording apparatus, comprising:a head unit having a recording head that performs recording by ejecting ink onto a recording medium; a wiper mechanism that wipes the ink adhered to a nozzle surface of the recording head; and a preliminary ejection device that applies a drive voltage waveform for preliminary ejection to the recording head, the preliminary ejection device comprising: a first preliminary ejection drive device that generates a stable waveform which causes small fluctuations of ink pressure in the recording head, and applies the stable waveform to the recording head to cause a first preliminary ejection; a second preliminary ejection drive device that generates an unstable waveform which causes larger fluctuations of ink pressure per one cycle of a print clock in the recording head than the first preliminary ejection, and applies the unstable waveform to the recording head to cause a second preliminary ejection; and a control device that actuates the first preliminary ejection drive device after a wiping operation by the wiper mechanism so that the recording head performs the first preliminary ejection, and then actuates the second preliminary ejection drive device so that the recording head performs the second preliminary ejection.