| CPC B41J 2/04573 (2013.01) [B41J 2/04536 (2013.01); B41J 2/04581 (2013.01); B41J 11/42 (2013.01)] | 11 Claims |
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1. An inkjet printing apparatus comprising:
a transport unit that transports a recording medium in a prescribed transport direction;
an ink ejector that ejects ink toward said recording medium transported by said transport unit; and
an ejection controller that causes said ink ejector to eject ink, wherein
said ejection controller comprises:
a reference timing signal generator that generates a reference timing signal indicating a reference timing; and
a sub-timing signal generator that generates a sub-timing signal having a shorter period than said reference timing signal,
said ejection controller performs process comprising:
speed calculation process of calculating a transport speed of said recording medium;
target delay amount determination process of determining a target delay amount corresponding to a transport distance of said recording medium in a period from generation of said reference timing to ejection of ink by said ink ejector on the basis of said transport speed coinciding with said reference timing;
speed information acquisition process of acquiring speed information indicating said transport speed calculated by said speed calculation process on the basis of said sub-timing signal;
target delay amount update process of updating said target delay amount to a new target delay amount, on the occurrence of change in said transport speed indicating by said speed information acquired by said speed information acquisition process after a time at which said reference timing signal is generated and before said recording medium is transported by said target delay amount determined by said target delay amount determination process, the target delay amount being updated in response to said transport speed as changed; and
ejection delay process of delaying timing of ejection of ink by said ink ejector on the basis of said sub-timing signal corresponding to said target delay amount updated by said target delay amount update process.
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