An image forming apparatus comprising: a photoconductor unit on which an electrostatic latent image is formed; a transfer unit configured to transfer the electrostatic latent image formed on the photoconductor unit to the printing medium; a conveying unit comprising a first roller configured to convey the printing medium toward the photoconductor unit to cause the printing medium to enter a nip formed between the photoconductor unit and the transfer unit, wherein the conveying unit is configured to convey a printing medium at a first conveying velocity toward the photoconductor unit, and to change the first conveying velocity when the printing medium approaches the photoconductor unit, wherein the conveying unit is configured to convey the printing medium at a second conveying velocity that is lower than the first conveying velocity from a deceleration start point (y), when the printing medium approaches the photoconductor unit, and convey the printing medium at a third conveying velocity that is different from the second conveying velocity from an acceleration start point (z) to cause the printing medium to enter the nip at the third conveying velocity, wherein the deceleration start point (y) is determined based on the acceleration start point (z), and wherein the third conveying velocity is identical to the first conveying velocity, characterised in that the first roller is next to the photoconductor unit without other intermediate rollers between the first roller and the photoconductor unit, wherein the deceleration start point (y) and the acceleration start point (z) are located between the photoconductor unit and the first roller. a photoconductor unit on which an electrostatic latent image is formed; a transfer unit configured to transfer the electrostatic latent image formed on the photoconductor unit to the printing medium; a conveying unit comprising a first roller configured to convey the printing medium toward the photoconductor unit to cause the printing medium to enter a nip formed between the photoconductor unit and the transfer unit, wherein the conveying unit is configured to convey a printing medium at a first conveying velocity toward the photoconductor unit, and to change the first conveying velocity when the printing medium approaches the photoconductor unit, wherein the conveying unit is configured to convey the printing medium at a second conveying velocity that is lower than the first conveying velocity from a deceleration start point (y), when the printing medium approaches the photoconductor unit, and convey the printing medium at a third conveying velocity that is different from the second conveying velocity from an acceleration start point (z) to cause the printing medium to enter the nip at the third conveying velocity, wherein the deceleration start point (y) is determined based on the acceleration start point (z), and wherein the third conveying velocity is identical to the first conveying velocity, characterised in that the first roller is next to the photoconductor unit without other intermediate rollers between the first roller and the photoconductor unit, wherein the deceleration start point (y) and the acceleration start point (z) are located between the photoconductor unit and the first roller. wherein the deceleration start point (y) is determined based on the acceleration start point (z), and wherein the third conveying velocity is identical to the first conveying velocity, characterised in that the first roller is next to the photoconductor unit without other intermediate rollers between the first roller and the photoconductor unit, wherein the deceleration start point (y) and the acceleration start point (z) are located between the photoconductor unit and the first roller.