Sheet supplying unit and sheet width detecting unit

A sheet supplying unit comprising:

• a conveying section configured to convey a sheet in a sheet conveyance direction;
• a plurality of first detecting sections configured to detect the sheet supplied to a surface of the conveying section, the plurality of first detecting sections being arranged in a spaced relation in a detection direction substantially perpendicular to the sheet conveyance direction;
• a moving body placed at a downstream side of said sheet conveyance direction and being movable;
• a pair of second detecting sections placed on said moving body in the detection direction with an interval and being configured to detect said sheet;
• and
• a controlling section configured, when the set of first detecting sections detect the existence of the sheet, to control a movement the moving body to place one of the pair of second detecting sections within a width region of the sheet, and to move the sheet along a first direction to a width detection position for detecting a width of the sheet using the second detection sections,
• wherein, when the sheet passes only one of the second detecting sections during the movement of the sheet to the width detection position along the first direction, the controlling section moves the moving body to place the other of the second detecting sections within the width region of the sheet, moves the sheet along a second direction opposite to the first direction from the width detection position, and further along the first direction to the width detection position, and judges the skew of the sheet in accordance with a first skew value corresponding to when the sheet passes only one of the second detecting sections and a second skew value corresponding to when the sheet further passes the other of the second detecting sections.