Patent ID: 7570914

Claim:
An image forming apparatus comprising: a photoconductive drum; a transferring roller pressed toward the photoconductive drum by a predetermined pressure to transfer an image formed on the photoconductive drum to a paper; a paper supply part for stacking the paper thereon; a pickup roller for picking up the paper from the paper supply part and conveying the paper to a nip between the photoconductive drum and the transferring roller; and a pickup shaft inserted in the pickup roller to rotate the pickup roller; wherein a linear velocity of the pickup shaft is slower than that of the photoconductive drum; the pickup roller further rotates in a rotational direction of the pickup shaft, undriven by the pickup shaft, after the paper enters the nip between the photoconductive drum and the transferring roller; and the pickup shaft has a substantially polygonal section, and a rotation space is formed at an inner perimeter of the pickup roller to allow the pickup roller to further rotate by a predetermined angle to compensate for the difference in the linear velocities of the photoconductive drum and the pickup roller.