Importance

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Abstract

An ink-jet printing apparatus, which performs printing by reciprocally scanning a carriage, incorporating a printhead, relative to a print medium, comprises a detection unit for outputting a detection signal in accordance with a predetermined distance of a carriage movement in a carriage scanning direction. In this ink-jet printing apparatus, a timing signal is generated in correspondence with a period of the detection signal; a time interval of the detection signal is timed; a ratio between the time interval of the detection signal and a delay time of the timing signal is stored in a memory as reciprocal registration adjustment information; a delay time of the timing signal is obtained based on the information read out from the memory and the time interval of the detection signal when performing printing in a backward scan; a delay signal obtained by delaying the timing signal is outputted in accordance with the delay time; and the printhead is driven in accordance with the delay signal. Accordingly, registration adjustment which is not influenced by variations of a scanning speed is possible in reciprocal printing.

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First Claim