Printing device and method for detecting paper width direction edge position

A printing device comprising:

• a head unit that includes a print head that prints on a sheet and a sensor that detects a presence or an absence of the sheet;
• a drive unit that causes the head unit to move to a width direction that is orthogonal to a feeding direction of the sheet;
• and
• a control unit that controls a position of the print head to the sheet by controlling the drive unit based on a detection result of the sensor,
• wherein the control unit executes, at least in a state which the sheet is loaded to a position of the sensor, a first control that obtains the detection result of the sensor whenever the head unit moves only a first interval while the head unit is caused to move by the drive unit to a specific direction from a reference position and a second control that, when a change from the presence of the sheet to the absence of the sheet of the sheet or from the absence of the sheet to the presence of the sheet is detected by the sensor during the first control, obtains the detection result of the sensor whenever the head unit moves only a second interval that is shorter than the first interval while the head unit is caused to move by the drive unit to a specific direction from a position that is apart, only by the first interval, from a detection position of the change during the first control, in a direction opposite to the specific direction, and
• the control unit recognizes the detection position of the change from the second control as an edge position in the width direction of the sheet when the change from the presence of the sheet to the absence of the sheet or from the absence to the presence of the sheet is detected by the sensor during the second control.