Patent ID: 7252359
Filing Date: 2007-08-07
Classification: B41J

Abstract:
1. An inkjet recording device comprising: a recording head composed of a sequence of nozzles from which ink is ejected; and head control means for ejecting ink droplets from the sequence of nozzles of said recording head based on recording data and for controlling a preliminary ejection operation to keep an ink ejection state of said recording head in good condition; wherein said head control means comprises: counting means that analyzes the recording data for counting a number of consecutive occurrences of a predetermined count pattern for each of nozzle blocks, said sequence of nozzles of the recording head being divided into the nozzle blocks each composed of a plurality of nozzles, said count pattern being representative of at least one predetermined pattern of the recording data of a size corresponding to the nozzle block, a count value of said counting means being reset each time said consecutive occurrences end; and determination means for determining for each block if the count value of said counting means has reached a predetermined value; wherein, if there is at least one block where the count value has reached the predetermined value, preliminary ejection processing is performed for said recording head.