An ink jet recording apparatus in which after each purging operation, a wiping operation is performed, and then a preliminary ejection is performed. In the preliminary ejection operation, a preliminary ejection by a small dot waveform is performed, and then a preliminary ejection by a larger dot waveform...http://www.google.de/patents/US6746100?utm_source=gb-gplus-sharePatent US6746100 - Ink jet recording apparatus and maintenance method
