Recording sheet moving device, image forming device, and recording sheet moving method

A recording sheet moving device, comprising:

• a moving unit that moves a recording sheet in a direction substantially parallel to a recording surface of the recording sheet and substantially perpendicular to a transport direction in which the recording sheet is transported, the moving unit being provided upstream in the transport direction as compared with an image forming position at which an image is formed on the recording surface of the recording sheet;
• a recording sheet specifying unit that specifies a length in the transport direction of the recording sheet and a weight per unit area of the recording sheet;
• a reference position specifying unit that specifies a reference position on the basis of which movement of the recording sheet by the moving unit is determined;
• a first memory configured to record, for each of a plurality of recording sheets, a threshold for a length in the transport direction in association with a weight per unit area;
• and
• a movement control unit that retrieves a threshold for a length in the transport direction on the basis of the weight per unit area specified by the recording sheet specifying unit from the first memory, and compares the retrieved threshold for a length in the transport direction and the length in the transport direction specified by the recording sheet specifying unit, to determine whether to cause the moving unit to move the recording sheet, and if it is determined that the recording sheet should be moved, causes the moving unit to move the recording sheet within a range specified on the basis of the reference position specified by the reference position specifying unit.