Patent ID: 9389544
Filing Date: 2016-07-12
CPC Classification: G03G

Claim Text:
1. An image forming apparatus comprising: a toner image forming portion configured to form a toner image on an image bearing member; a rotatable endless first belt bearing the toner image transferred from the image bearing member; a rotatable endless second belt bearing a recording medium; a plurality of first stretch rollers including a first transfer roller, the plurality of first stretch rollers stretching the first belt; a plurality of second stretch rollers including a second transfer roller, the plurality of second stretch rollers stretching the second belt, the first and second transfer rollers forming a transfer portion where the toner image is transferred to the recording material, with the first belt and the second belt disposed between the first and second transfer rollers; a contact-separation mechanism configured to change a state of the transfer portion between a contact state in which the first and second belts contact each other and a separation state in which the first and second belts separate from each other; and a controller rotating and stopping the first belt such that a rotational position of the first belt with respect to the first stretch rollers is changed and rotating and stopping the second belt such that a rotational position of the second belt with respect to the second stretch rollers is changed, based on a stop duration time of at least either the first belt or the second belt, the controller rotating the first belt and the second belt for different amounts of time in the separation state and overlapping a time from starting to stopping the rotation of the first belt and a time from starting to stopping the rotation of the second belt.