A device includes a head to perform an operation on a conveyed object; a head moving device to move the head in a width direction orthogonal to a conveyance direction of the conveyed object; a position detector to detect a position of the conveyed object in the width direction; a speed detector to detect a moving speed of the conveyed object in the width direction; a position predictor to obtain a predicted width position of the conveyed object after a predetermined period, based on a detected position of the conveyed object and a detected moving speed of the conveyed object; a speed calculator to calculate a travel speed of the head; and a head travel controller to control the head moving device to move the head at the calculated travel speed. With the calculated travel speed, the head arrives at the predicted width position after the predetermined period.