Automatic document feeder, image forming device, and image reading device

An automatic document feeder comprising:

• a sheet stacking tray, on which a document sheet is stacked;
• a sheet separating device configured to separate and individually feed the document sheet;
• a conveying device including conveying rollers configured to convey the document sheet to a read position;
• a scanner configured to read an image on the document sheet;
• a sheet ejection device including sheet ejection rollers configured to eject the document sheet, and
• a plurality of sensors configured to detect a position of the document sheet as the document sheet is conveyed by the conveying rollers and ejected by the sheet ejection rollers, the plurality of sensors including a downstream sensor provided furthest downstream in a conveying direction of the document sheet among the plurality of sensors and the downstream sensor being located upstream of a downstream roller furthest downstream in the conveying direction among the conveying rollers and the ejection rollers;
• and
• a controller configured to,
• perform an initialization operation to initialize each unit of the automatic document feeder, and
• perform a remaining-sheet treatment to discharge a previous document sheet that remains from a previous job by rotating the downstream roller after the initialization operation is complete such that the remaining-sheet treatment is performed, after a state where an image is readable is established for a current job, the previous job being a job preceding the current job.