Patent ID: 7912417

Claim:
An image forming apparatus comprising: an image forming part; a first conveyance roller that conveys a recording medium to the image forming part; a forward/reverse-rotatable second conveyance roller, located between the first conveyance roller and the image forming part in a conveyance direction of the recording medium; a contact member, in contact with the second conveyance roller, that forms a nip between the second conveyance roller and the contact member; a first conveyance roller driver that rotate-drives the first conveyance roller in the same direction as the conveyance direction of the recording medium; and a drive transmission mechanism that performs drive transmission from the first conveyance roller driver to the second conveyance roller so as to start rotation of the second conveyance roller in a reverse direction of the conveyance direction of the recording medium before a lead edge of the recording medium arrives at the nip, wherein the drive transmission mechanism comprises: a drive transmission driven gear, having a notch portion and a gear portion, that rotates in accordance with rotation of the first conveyance roller; and a reverse gear, disposed opposite to the drive transmission driven gear, that does not receive drive transmission from the drive transmission driven gear when the notch portion is opposite to the drive transmission driven gear, but receives the drive transmission from the drive transmission driven gear and rotates when the gear portion is opposite to the drive transmission driven gear so as to rotate the second conveyance roller in the reverse direction of the conveyance direction of the recording medium.