IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To perform highly precisely rocking correction of a resist roller with the consideration of a rocking direction.SOLUTION: The amount of deflection x to a standard paper position of a paper sheet to be conveyed is acquired to calculate the necessary rocking amount X (S100). The rocking direction of the necessary rocking amount X is determined to be whether toward the front or not (S102). When the rocking direction of the necessary rocking amount X is toward the front, the instruction value Yfor rocking with the consideration of a biasing force is acquired based on the correction formula IIY=a{ X/(amount of motor movement/1 pulse)+b} (S104). Meanwhile, when the rocking direction of the necessary rocking amount X is toward the depth, the instruction value Yfor rocking with the consideration of a biasing force is acquired based on the correction formula IY=a{ X/(amount of motor movement/1 pulse)+b} (S106). Based on the acquired rocking instruction value Y, the resist rocking correction is performed (S108). In this manner, the amount of rocking deflection, caused by the biasing force to a resist roller, generated between the directions toward the front and toward the depth can be avoided to uniformize the rocking amount.