Image forming apparatus and operation control method that each allow operation of removing sheet wound around fixing member to be facilitated

An operation control method that is executed by an image forming apparatus including a fixing member configured to come into contact with a sheet to which a toner image is transferred and fix the toner image onto the sheet, the fixing member being provided so as to be rotatable, a pressure member provided to be opposed to the fixing member such that the pressure member is rotatable, the pressure member forming a fixing nip portion between the fixing member and the pressure member, the fixing nip portion being configured to pressurize the sheet, and a first sensing portion configured to sense the sheet on a downstream side of the fixing nip portion in a conveyance path of the sheet in a conveyance direction of the sheet, the conveyance path extending through the fixing nip portion, the operation control method comprising:

• a stop step of stopping an image formation process of forming an image on the sheet in a case where the first sensing portion does not sense the sheet before a specific time defined in advance elapses after a timing at which a front end of the sheet in the conveyance direction reaches the fixing nip portion while the image formation process is in execution;
• and
• a rotation step of reversely rotating the fixing member by an amount of rotation corresponding to a difference between a specific distance and length of the sheet in the conveyance direction in a case where the image formation process is stopped in the stop step and the length is less than the specific distance, the specific distance being greater than a product of the specific time and conveyance speed of the sheet.