A transport device includes: a first transport body; a second transport body that is movable between a contact position and a separate position with respect to the first transport body and that nips a transported material with the first transport body at the contact position; and a transport section that includes a holder to hold a leading end portion of the transported material and that transports the transported material toward a nip region where the first transport body and the second transport body nip the transported material in a state in which the second transport body is located at the separate position. After holding of the leading end portion by the holder for the transported material transported by the transport section has been released, the second transport body nips the transported material with the first transport body and transports the transported material.

An image forming apparatus includes an image bearing member, an image forming portion, an endless belt, a plurality of stretching rollers including an inner roller, an outer roller, a position changing mechanism capable of changing a position of the inner roller to a first position and a second position positioned downstream of the first position with respect to a rotational direction of the endless belt, a feeding member, a feeding member driving portion, and a controller. A feeding start timing of a recording material by the feeding member depends on the position of the inner roller during transfer of a toner image onto the recording material.

A rotation center of a secondary transfer inner roller located at a first position is located downstream of a rotation center of a secondary transfer outer roller in a movement direction of an intermediate transfer belt tensioned by the secondary transfer inner roller and an idler roller. The rotation center of the secondary transfer inner roller located at a second position coincides in position with the rotation center of the secondary transfer outer roller, or is located upstream of the rotation center of the secondary transfer outer roller in the movement direction of the intermediate transfer belt tensioned by the secondary transfer inner roller and the idler roller.

An image forming apparatus includes an image bearing member, an image forming portion, an endless belt, a plurality of stretching rollers including an inner roller, an outer roller, a position changing mechanism capable of changing a position of the inner roller to a first position and a second position positioned downstream of the first position with respect to a rotational direction of the endless belt, a feeding member, a feeding member driving portion, and a controller. A feeding start timing of a recording material by the feeding member depends on the position of the inner roller during transfer of a toner image onto the recording material.

An image forming apparatus includes a memory and a controller. The memory is configured to store information related to a recording medium type detected by a detector in the past. The controller is configured to control a feeder so as to prevent feeding of a recording medium from starting, when a printing operation is started in a first mode, in a case that a recording medium type set through a setting unit and a recording medium type discriminated based on the information stored in the memory do not match with each other.

An image forming apparatus includes an image bearing member, an image forming portion, an endless belt, a plurality of stretching rollers including an inner roller, an outer roller, a position changing mechanism capable of changing a position of the inner roller to a first position and a second position positioned downstream of the first position with respect to a rotational direction of the endless belt, a feeding member, a feeding member driving portion, and a controller. A feeding start timing of a recording material by the feeding member depends on the position of the inner roller during transfer of a toner image onto the recording material.

A rotation center of a secondary transfer inner roller located at a first position is located downstream of a rotation center of a secondary transfer outer roller in a movement direction of an intermediate transfer belt tensioned by the secondary transfer inner roller and an idler roller. The rotation center of the secondary transfer inner roller located at a second position coincides in position with the rotation center of the secondary transfer outer roller, or is located upstream of the rotation center of the secondary transfer outer roller in the movement direction of the intermediate transfer belt tensioned by the secondary transfer inner roller and the idler roller.

An image forming apparatus includes a memory and a controller. The memory is configured to store information related to a recording medium type detected by a detector in the past. The controller is configured to control a feeder so as to prevent feeding of a recording medium from starting, when a printing operation is started in a first mode, in a case that a recording medium type set through a setting unit and a recording medium type discriminated based on the information stored in the memory do not match with each other.

A recording material discriminating apparatus includes: a hardware processor that: detects a physical property of a recording material in different ways; and when transmittance of the recording material is within a first range, discriminates a type of the recording material by using a detection result from the hardware processor, and when the transmittance of the recording material is within a second range different from the first range, discriminates the type of the recording material by using a detection result from the hardware processor.

An image forming apparatus includes: a first roller having an elastic part; a second roller configured to form a nip between the first roller and the second roller; a holding member configured to hold the second roller; and a control section configured to control the position of the holding member such that the center distance between the first roller and the second roller is maintained at a constant value when a sheet passes through the nip.