US Patent 7933052 Document feeder and image capturing device

Document feeder and image capturing device preventing empty stamping associated with improper positioning of printing unit. Document feeder A, conveying document originals from a document placement location, along a predetermined conveyance path (12), and to a document information-capturing location (5, 6), is furnished with: a printing unit (8), which is shiftable along the document widthwise direction approximately orthogonal to the document conveyance direction, and is for carrying out predetermined printing onto conveyed documents; and a detection unit (S4), provided in the conveyance path further upstream in the conveyance direction than the printer unit (8), that detects whether a conveyed document will pass inside the limits of the range in which the printer unit (8) prints.