Abstract: An image forming apparatus includes a sensing portion configured to sense a current that flows through a secondary transfer member, or a voltage that has been applied; and a controller configured to perform an operation to determine a transfer voltage to be applied to the secondary transfer member in secondary transfer, on a basis of a result of sensing performed by the sensing portion at a time when a test voltage has been applied to the secondary transfer member in non-image formation, and the controller performs, in the operation, controlling a first application portion and a second application portion not to apply the voltage to a primary transfer member during a period of applying the test voltage to the secondary transfer member.

Abstract: An image forming apparatus includes: a sensing portion configured to sense a current that flows through a secondary transfer member, or a voltage that has been applied; and a controller configured to perform an operation to determine a transfer voltage to be applied to the secondary transfer member in secondary transfer, on a basis of a result of sensing performed by the sensing portion at a time when a test voltage has been applied to the secondary transfer member in non-image formation, and the controller performs, in the operation, controlling a first application portion and a second application portion not to apply the voltage to a primary transfer member during a period of applying the test voltage to the secondary transfer member.

Abstract: An image forming apparatus includes a belt member, a toner image forming unit, a first transfer roller, a second transfer roller provided at a position opposed to the first transfer roller with the belt member intervened and forming a transfer portion, and a power feed roller configured to abut against an outer circumferential surface of the first transfer roller to supply a current to a metal shaft of the first transfer roller. A width of a large diameter portion of the power feed roller with respect to a width direction intersecting a direction of movement of the belt member is equal to or greater than a maximum width of image formation and smaller than a width of a maximum size of the recording material.

Abstract: An image forming apparatus includes a belt member, a toner image forming unit, a first transfer roller, a second transfer roller provided at a position opposed to the first transfer roller with the belt member intervened and forming a transfer portion, and a power feed roller configured to abut against an outer circumferential surface of the first transfer roller to supply a current to a metal shaft of the first transfer roller. A width of a large diameter portion of the power feed roller with respect to a width direction intersecting a direction of movement of the belt member is equal to or greater than a maximum width of image formation and smaller than a width of a maximum size of the recording material.