A material conveyor (80, 80A, 280, 380) for an image forming apparatus, comprising: a first rotary body (20, 30A, 210, 320); a second rotary body (20A, 30, 230, 330), disposed opposing the first rotary body (20, 30A, 210, 320) in an opposing region through which a material is conveyable; and a contact and separation device (60, 60A, 260, 360) configured to cause at least a surface, of at least one of the first rotary body (20, 30A, 210, 320) and the second rotary body (20A, 30, 230, 330) to move, between a separated position at which the first rotary body (20, 30A, 210, 320) and the second rotary body (20A, 30, 230, 330) are separated from each other and a contact position at which both the first rotary body (20, 30A, 210, 320) and the second rotary body (20A, 30, 230, 330) are configured to contact and convey the material, a controller (100, 100A, 240, 340) configured to control the contact and separation device (60, 60A, 260, 360), the contact and separation device (60, 60A, 260, 360) being configured to cause at least the surface of at least one of the first rotary body (20, 30A, 210, 320) and the second rotary body (20A, 30, 230, 330) to move from the separated position to the contact position at: a first speed from the separated position to a position between the separated position and the contact position; and a second speed, relatively slower than the first speed, from the position, between the separated position and the contact position, to the contact position after movement at the first speed, characterized in that when a conveyance speed of the material is equal to or smaller than a threshold value, the controller (100, 100A, 240, 340) is configured to take a temporary stop time during transition from the first speed to the second speed. a first rotary body (20, 30A, 210, 320); a second rotary body (20A, 30, 230, 330), disposed opposing the first rotary body (20, 30A, 210, 320) in an opposing region through which a material is conveyable; and a contact and separation device (60, 60A, 260, 360) configured to cause at least a surface, of at least one of the first rotary body (20, 30A, 210, 320) and the second rotary body (20A, 30, 230, 330) to move, between a separated position at which the first rotary body (20, 30A, 210, 320) and the second rotary body (20A, 30, 230, 330) are separated from each other and a contact position at which both the first rotary body (20, 30A, 210, 320) and the second rotary body (20A, 30, 230, 330) are configured to contact and convey the material, a controller (100, 100A, 240, 340) configured to control the contact and separation device (60, 60A, 260, 360), the contact and separation device (60, 60A, 260, 360) being configured to cause at least the surface of at least one of the first rotary body (20, 30A, 210, 320) and the second rotary body (20A, 30, 230, 330) to move from the separated position to the contact position at: a first speed from the separated position to a position between the separated position and the contact position; and a second speed, relatively slower than the first speed, from the position, between the separated position and the contact position, to the contact position after movement at the first speed, characterized in that when a conveyance speed of the material is equal to or smaller than a threshold value, the controller (100, 100A, 240, 340) is configured to take a temporary stop time during transition from the first speed to the second speed. a first speed from the separated position to a position between the separated position and the contact position; and a second speed, relatively slower than the first speed, from the position, between the separated position and the contact position, to the contact position after movement at the first speed, characterized in that when a conveyance speed of the material is equal to or smaller than a threshold value, the controller (100, 100A, 240, 340) is configured to take a temporary stop time during transition from the first speed to the second speed.