Image forming apparatus

An image forming apparatus comprising:

• an image forming portion including a rotatable image bearing member and configured to carry out image formation in which a toner image is formed on the image bearing member;
• a rotatable intermediary transfer member onto which the toner image is primarily transferred from the image bearing member in a primary transfer portion;
• a secondary transfer member configured to form a secondary transfer portion in which the toner image is secondarily transferred from the intermediary transfer member onto a recording material;
• a cleaning blade configured to clean a surface of the intermediary transfer member in contact with the surface of the intermediary transfer member at a cleaning position downstream of the secondary transfer portion and upstream of the primary transfer portion with respect to a movement direction of the intermediary transfer member;
• a first feeding portion and a second feeding portion which are each configured to feed the recording material toward the secondary transfer portion;
• and
• a controller configured to control the image forming portion, the controller, when the recording material being fed from the first feeding portion runs out while image formation is in process, interrupting the image formation, and then controlling the image forming portion to resume image formation with recording material fed from the second feeding portion,
• wherein in a case where the feeding source of the recording material is changed from the first feeding portion to the second feeding portion after the recording material is absent in the first feeding portion, when
• a toner image passing through the secondary transfer portion without being transferred onto the recording material before the recording material fed from the second feeding portion reaches the secondary transfer portion is an untransferred toner image,
• a position of a leading end of the untransferred toner image on the intermediary transfer member with respect to a conveying direction of the intermediary transfer member is an untransferred toner image leading end,
• a position of a leading end of an image forming region, on the image bearing member with respect to a conveying direction of the image bearing member, in which a first toner image after resumption of the image formation is formable is a post-resumption image leading end, and
• a timing when a position of the intermediary transfer member on which the untransferred toner image leading end is transferred passes through the cleaning position and then first passes through the primary transfer portion is a first timing,
• the controller controls the image forming portion to carry out control in which the image formation is resumed so that a timing when the post-resumption image leading end first reaches the primary transfer portion is a second timing after the first timing.