Sheet conveyance apparatus, image reading apparatus, and image forming apparatus

A sheet conveyance apparatus comprising:

• a supporting tray on which a sheet is supported;
• a conveyance unit configured to convey the sheet in a conveyance direction, the conveyance unit including a rotating member and a separation portion together configured to separate sheets supported on the supporting tray one by one;
• a sensor unit including:
• a first sensor configured to detect the sheet conveyed by the conveyance unit at a first detection position;
• and
• a second sensor configured to detect the sheet conveyed by the conveyance unit at a second detection position that is different from the first detection position in a width direction orthogonal to the conveyance direction;
• and
• a control unit configured to:
• execute a first stop processing of stopping conveyance of the sheet by the conveyance unit in a case where, until a threshold value time has elapsed after one of the first sensor or the second sensor has detected the sheet, the other one of the first sensor or the second sensor does not detect the sheet;
• execute a speed detection processing of measuring a speed of the sheet conveyed by the conveyance unit based on a detection result of the sensor unit;
• set the threshold value time to:
• a first time in a case where the speed of the sheet measured in the speed detection processing is a first speed;
• and
• a second time that is longer than the first time in a case where the speed of the sheet measured in the speed detection processing is a second speed that is slower than the first speed.