An image forming apparatus includes a positioning portion, a restriction portion, and a return portion. In contrast to an engagement portion provided on one of an apparatus main body and a pullout portion, an engaged portion provided on the other of the apparatus main body and the pullout portion. When the pullout portion is in an attachment position, first and second contact portions are in contact with the engagement portion. The contact between the first contact portion and the engagement portion restricts movement of the pullout portion in an insertion direction. The contact between the second contact portion and the engagement portion restricts movement of the pullout portion in a pullout direction. The restriction portion restricts the movement of the pullout portion when the pullout portion reaches a restricted position. The return portion moves the pullout portion to the attachment position when the pullout portion is in the restricted position.

An image forming apparatus includes an apparatus main body having a receiving portion on a conveying path, an open/close unit movable between open and close positions, a roller located on the conveying path when the open/close unit is closed, a pressure applying unit applying pressure to the roller, and a separation unit movable between first and second positions. When at the first position, the roller contacts the receiving portion with pressure from the pressure applying unit. When at the second position, the roller is separated from the receiving portion. A switching device switches the separation unit's position, controlled by a control unit. An open/close detecting unit detects the open/close unit's state. If the separation unit is at the second position and the open/close unit is detected at the open position, the control unit controls the switching device to move the separation unit to the first position.

An image forming apparatus includes an apparatus main body having an opening portion, an opening and closing member supported to open/close relative to the apparatus main body; a fixing unit detachably supported with respect to the apparatus main body via the opening portion, including a heating unit and a pressure roller forming a fixing nip and a pair of conveyance rotation members having a conveyance nip, including a urging portion for urging the fixing unit toward a second position from a first position. In a case where the sheet is jammed while being caught in the fixing nip and the conveyance nip, and in a case where urging force of the urging portion acts on the sheet, a tensile force acting on the sheet is less than a binding force of the fixing nip and the conveyance nip.