Patent ID: 7234695

Claim:
An image forming device comprising: a paper feed roll which applies force in a transport direction to a sheet and a separating member which applies a force in a direction of hindering the transport of the sheet, in which plural multifed sheets are separated by the paper feed roll and the separating member; a paper feed roll side sheet speed detecting part which detects a transport speed V 1 of a sheet on a paper feed roll side; a separating member side sheet speed detecting part which detects a transport speed V 2 of a sheet on a separating member side; a multifeed sheet detecting part which detects a transport of plural sheets; and a control part which determines a sheet multifeed state and controls paper feed when the relationship between the speed V 1 detected by the paper feed roll side sheet speed detecting part and the speed V 2 detected by the separating member side sheet speed detecting part is V 1 >V 2 >0 and the multifeed sheet detecting part detects the transport of plural sheets.