The present invention comprises: a printing cylinder which conveys sheets; a drive device (41) which drives the printing cylinder; an encoder (44) which detects the phase of the printing cylinder; and first to fourth inkjet nozzle heads (23-26) which print onto the sheets. The present invention comprises: a floating sensor (22) which opposes the printing cylinder and senses abnormalities in the sheets; and a control device (28) which controls the operation of the drive device (41). The control device (28) has a function for stopping the drive device (41) when the floating sensor (22) has sensed a floating part. The control device (28) causes the drive device (41) to operate on the basis of: the phase of the printing cylinder when the floating sensor (22) has sensed the floating part; and the phase of the printing cylinder when the drive device (41) has stopped after floating sensing. The control device (28) has a function for moving the floating part sensed by the floating sensor (22) to a predetermined confirmation position. Provided is a digital printer which is capable of quickly specifying locations where sensed abnormalities have occurred during printing.