Multipass image-forming device having large feed calibration

Incremental printing of symbolic information – Ink jet – Controller

Reexamination Certificate

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C347S041000, C347S104000

Reexamination Certificate

active

07665818

ABSTRACT:
An image-forming device forms an image having improving image quality by conveying a sheet in a nonuniform conveyance, and reduces a processing load required for calibrating a conveying length for the recording medium. In an image-forming device, a process for acquiring a theoretical conveying length for conveying a recording medium (S404) and for calibrating the theoretical conveying length (S409) is only executed for a large feed used to convey the recording medium a second conveying length greater than a first conveying length (S405: YES) and not for small feeds used to convey the recording medium the first conveying length (S405: NO). Since calibration is performed on the second conveying length, which is greater than the first conveying length, this method reduces a decline in precision for the conveying length of the recording medium, even when reducing the number of calibrations.

REFERENCES:
patent: 6331038 (2001-12-01), Boleda et al.
patent: 6764157 (2004-07-01), Lee et al.
patent: 6769759 (2004-08-01), Yamasaki et al.
patent: 6827421 (2004-12-01), Nunokawa et al.
patent: 7494204 (2009-02-01), Otsuki
patent: 2004/0075708 (2004-04-01), Arakawa
patent: 0566318 (1993-10-01), None
patent: 1211084 (2002-06-01), None
patent: 2002-283543 (2002-10-01), None
patent: 2003-320719 (2003-11-01), None
EP Search Report dtd Jan. 12, 2007, EP Appln. 06020418.7-1251.

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