Importance

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Abstract

A first reference portion has a lower surface of a first color. A second reference portion is adjacent to the first reference portion in a first direction and has a lower surface of a second color. A data processing portion executes a color determination process of determining whether one or more reference pixel data of a reference area in line image data is data of the first color or the second color. A control device sequentially selects a plurality of drive operations from a plurality of trial drive operations and causes the unit drive device to execute the plurality of drive operations, thereby positioning a scanning unit at a home position. When causing the unit drive device to execute the plurality of drive operations, the control device outputs, to the unit drive device, a speed command signal of a different level according to a moving distance of the scanning unit.

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First Claim