The transfer roller contact and release mechanism prevents dirt and distortion. A transfer roller contact cam [A] in the front right side of the mainframe is driven by the transfer roller contact motor [C]. The transfer roller contact cam moves the transfer roller contact arm [C] by its rotation. The transfer roller [D] and OPC drum [E] are separated by the movement of the transfer roller contact arm during process control, discarding toner, or when the main power is turned off.