Image forming apparatus

An image forming apparatus comprising:

• an image bearing member configured to bear an electrostatic latent image;
• a developing portion configured to develop the electrostatic latent image borne on the image bearing member as a toner image;
• a transfer member configured to form a transfer portion between the transfer member and the image bearing member and transfer the toner image borne on the image bearing member onto a sheet in the transfer portion;
• a conveyance portion configured to convey the sheet toward the transfer portion;
• a guide member disposed on the same side as the image bearing member with respect to a conveyance path that is provided between the conveyance portion and the transfer portion and that the sheet passes through, the guide member being configured to guide the sheet conveyed by the conveyance portion toward the transfer portion;
• a rotary member disposed to oppose the guide member and configured to be movable between a first position and a second position and rotate in accordance with the sheet conveyed by the conveyance portion, the first position being a position where the rotary member projects into the conveyance path, the second position being a position where the rotary member is farther away from the guide member than at the first position;
• and
• an urging portion configured to urge the rotary member toward the first position,
• wherein an urging force of the urging portion is set such that the rotary member is positioned at the first position in a case where a first sheet having a first stiffness is conveyed by the conveyance portion and the transfer portion simultaneously, and such that the rotary member is positioned at the second position by being pushed by a second sheet having a second stiffness higher than the first stiffness in a case where the second sheet is conveyed by the conveyance portion and the transfer portion simultaneously.