Sheet conveying apparatus and image reading apparatus

A sheet conveying apparatus comprising:

• a tray on which a plurality of sheets are to be stacked where the tray is configured such that a business card can be stacked on the tray, and the tray further is configured such that a labeled sheet, instead of the business card, to which a label is attached and having a size with a length in a conveyance direction of the labeled sheet larger than a length of the business card in the conveyance direction of the sheet, can be stacked on the tray,
• a feeder configured to successively convey the plurality of sheets stacked on the tray;
• a sheet sensor, arranged in a conveyance path in which a sheet of the plurality of sheets is conveyed, configured to detect the sheet conveyed by the feeder;
• a double-feed sensor configured to detect double feed corresponding to a state in which plural sheets are conveyed in an overlapping manner by the feeder;
• and
• a controller configured to determine whether or not the double feed has occurred, and to determine, as a determined sheet length and based on a detection result of the sheet sensor, a length of the sheet in the conveyance direction during conveyance of the sheet by the feeder, where a double-feed length corresponds to a length, in the conveyance direction of the sheet, of a region in which the double feed has been detected by the double-feed sensor,
• wherein, in a case where the double-feed length is larger than a predetermined distance which is common to the business card and the labeled sheet, the controller determines that the double feed has occurred,
• wherein, in a case where the double-feed length is smaller than the first predetermined distance but larger than 0 and the determined sheet length is not larger than a predetermined length which is common to the business card and the labeled sheet, the controller determines that the double feed has occurred, and
• wherein, in a case where the double-feed length is smaller than the predetermined distance but larger than 0 and the determined sheet length is larger than the predetermined length, the controller determines that the double feed has not occurred.