An image forming apparatus comprising:
- an image forming portion configured to form a toner image on an image bearing member with toner having a predetermined polarity as a normal charge polarity;
- a circulatable and movable intermediary transfer member to which the toner image is primarily transferred from the image bearing member at a primary transfer portion;
- an inner roller provided in an inner peripheral surface side of the intermediary transfer member;
- an outer roller in contact with the inner roller via the intermediary transfer member and configured to form a secondary transfer portion at which the toner image is secondarily transferred to a sheet from the intermediary transfer member;
- an applying portion configured to apply a voltage to the secondary transfer portion;
- a feeding portion in which the sheet is set;
- a conveyance portion configured to convey the sheet from the feeding portion toward the secondary transfer portion;
- a double side conveyance portion configured to reverse a front side and a back side of the sheet which has passed through the secondary transfer portion and to convey the sheet to the secondary transfer portion;
- and
- a control portion configured to control the image forming portion, the applying portion, the conveyance portion and the double side conveyance portion so as to perform a double side print in which
- the toner image is secondarily transferred to a first side and a second side of the sheet from the intermediary transfer member, and
- after a first toner image formed on a first image formation area on the intermediary transfer member is secondarily transferred to a first side of a first sheet conveyed to the secondary transfer portion by the conveyance portion, a second toner image formed on a second image formation area on the intermediary transfer member is secondarily transferred to a second side of a second sheet conveyed to the secondary transfer portion by the double side conveyance portion,
- wherein the control portion controls so that
- when performing the double side print, in a case in which the first sheet is not conveyed to the secondary transfer portion, a continuation process is performed in which the second toner image is secondarily transferred to the second side of the second sheet, and
- in a case of performing the continuation process, while the first image formation area passes through the secondary transfer portion, a predetermined voltage, which makes the outer roller be at a potential of the predetermined polarity side to the inner roller and makes an absolute value of a potential difference between the inner roller and the outer roller be less than a discharging threshold value, is applied to the secondary transfer portion by the applying portion.