SHEET CONVEYING DEVICE, DOCUMENT CONVEYING DEVICE AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a sheet conveying device that can continue operation without stopping a document conveying operation, even if double feeding occurs and when the double feeding that has occurred is dissolved.SOLUTION: A document conveyance control unit 210 is characterized by: finding a tip deviation time T1 between a first point of time when detecting the tip of a precedent document D in a double feeding detection position P1 and a second point of time when detecting the tip of a following document D being a double feeding occurrence position, when detecting the occurrence of double feeding; deciding whether the tip deviation time T1 is equal to or greater than a threshold time Tth set in the time when the tip position of the following document D at the point of time when a paper feed part 24 stops driving becomes the upstream side position in the conveying direction of register roller pairs 25; and making the register roller pairs 25 continue the operation without stopping the driving when the tip deviation time T1 becomes the threshold time Tth or more.