Document conveying apparatus that properly discharges documents regardless of amount of documents

A document conveying apparatus comprising:

• a paper-supply tray on which documents are stacked;
• a discharge tray provided below the paper-supply tray;
• a feeding roller that feeds out the documents one sheet at a time from the paper-supply tray;
• a conveying mechanism that conveys the fed documents along a conveying path that passes by a reading position;
• a discharge mechanism that conveys the documents along a discharge path connected to the conveying path and discharges the documents to the discharge tray from a discharge port provided at an end portion on a downstream side in a conveying direction of the discharge path;
• a swing mechanism at an end portion on the upstream side in the conveying direction of the discharge path and comprising a swing shaft, an axial direction of which is a width direction of the documents orthogonal to the conveying direction, and that swings the discharge mechanism centered around the swing shaft;
• a raising/lowering mechanism that raises or lowers the paper-supply tray so that the upper surface of the documents stacked on the paper-supply tray is pressed against the feeding roller;
• an upper surface height measuring unit provided above the discharge port position at an upper limit of a swingable range of the discharge mechanism, and that measures the height of the upper surface of the documents stacked on the discharge tray;
• and
• a control unit that, by causing the swing mechanism to swing the discharge mechanism according to the height measured by the upper surface height measuring unit, performs control so that a difference between the discharge port and the upper surface of the documents stacked on the discharge tray is within a specified range;
• wherein
• the control unit, in a case where the height of the upper surface of the documents stacked on the discharge tray is not raised even though the documents are fed out by the feeding roller, causes the feeding roller to stop feeding the documents.