Patent Number: 7,029,092

Title: Ink-jet printing apparatus and preliminary discharge control method for the apparatus

Abstract: In an ink-jet printing apparatus which includes a plurality of printing heads, each having an array of ink discharging elements, preliminary discharge of driving the elements of at least one printing head is performed a predetermined number of times. The printing head for which the preliminary discharge is to be performed is switched in a predetermined cycle. In performing the preliminary discharge, switching of the printing head is so controlled as to perform preliminary discharge a desired number of times for all the elements of the printing heads by repeating the cycle.

Inventors: Edamura; Tetsuya (Kanagawa, JP), Tajika; Hiroshi (Kanagawa, JP), Konno; Yuji (Kanagawa, JP), Kawatoko; Norihiro (Kanagawa, JP), Ogasahara; Takayuki (Rochester, NY), Masuyama; Atsuhiko (Kanagawa, JP), Maru; Akiko (Kanagawa, JP)

Assignee: Canon Kabushiki Kaisha

International Classification: B41J 2/165 (20060101)

Expiration Date: 4/18/02018