An operation control method that is executed by an image forming apparatus including a transfer portion and a fixing part, the transfer portion being configured to transfer a toner image to a sheet and convey the sheet, the fixing part being configured to fix the toner image transferred to the sheet onto the sheet and convey the sheet, the fixing part being provided on a downstream side in a conveyance path of the sheet with respect to a conveyance direction of the sheet, the conveyance path extending through the transfer portion, the operation control method comprising:
- a detection step of detecting an amount of deflection of the sheet during a specific period in which the sheet is conveyed by both the transfer portion and the fixing part;
- and
- an adjustment step of adjusting, before the specific period ends, conveyance speed of the sheet by any one or both of the transfer portion and the fixing part on a basis of the amount of deflection detected during the specific period.