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AssigneeCanon Kabushiki Kaisha
InventorsHitoshi Tsuboi, Katsuhiro Shirota, Noribumi Koitabashi, Yasunori Fujimoto
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The present invention provides an ink jet printing apparatus and a preliminary ejecting method. In both a full-line and a serial printer, the amount of ink passing through nozzles of print heads is sometimes decreased below a normal value before and during actual printing, In the printer of present invention, a preliminary ejecting operation is performed taking the opportunity in which the amount of ink passing through nozzles is decreased below a normal value. Then, the amount of ink passing through nozzles recovers to the normal value at an ink ejection after the preliminary ejecting operation. Since only a small amount of ink is ejected through the nozzles during the preliminary ejection operation, dots formed on a print sheet are not noticeable. Further, it is unnecessary to move the print heads to a home position where an ejection recovering process is executed to remove ink having an increase viscosity.
An ink jet printing apparatus capable of performing a preliminary ejecting operation that does not contribute to printing, said apparatus comprising:
A preliminary ejecting method for an ink jet printing apparatus comprising a print head having an ejecting portion, the apparatus being capable of performing a preliminary ejecting operation that does not contribute to printing, wherein an amount of ink ejected through the ejecting portion varies depending on the amount of time during which printing is not executed, said method comprising the steps of:
An ink jet printing apparatus capable of performing a preliminary ejecting operation that does not contribute to printing, said apparatus comprising:
Dependencies are inferred from the claim text.