An image forming apparatus includes an image forming portion, a rotatable intermediary transfer belt, a plurality of stretching rollers, an outer roller, a moving mechanism, and a controller. In a case that a basis weight of a first recording material is a first basis weight and a basis weight of a second recording material is a second basis weight greater than the first basis weight, a position of the inner roller is a second position when the toner image is transferred onto the second recording material, and in a case that the basis weight of the first recording material and the basis weight of the second recording material are the second basis weight, the position of the inner roller is a first position when the toner image is transferred onto the second recording material.

An automatic detection method for a paper size is disclosed. a plurality of mark points is set on a paperweight along a paperweight direction that is different from a feeding direction. The disclosure senses a plurality of row images combining into a scan image during a paper passing between the paperweight and an image sensor, determines an edge length of the paper based on a range of the mark points covered by the paper, and determines a paper size based on the edge length. The disclosure can effectively detect the paper size without any additional sensors.

An information processing apparatus includes a processor configured to: obtain characteristic values including smoothness and basis weight of a recording medium; and identify the type of the recording medium on the basis of the smoothness and the basis weight.

A measurement device includes: a resistance measurement unit that measures an electrical resistance of a measurement target; a first measurement unit, including a detector that detects information indicating a first physical property other than the electrical resistance of the measurement target, that measures the first physical property from a detection result from the detector; a second measurement unit, including a detector that detects information indicating a second physical property other than the electrical resistance and the first physical property of the measurement target, that measures the second physical property from a detection result from the detector, in which a length of time from a start of driving the detector until a start of actual measurement is longer in the second measurement unit than in the first measurement unit; and a control unit that performs first control causing the first measurement unit to execute a measurement operation of measuring the first physical property in parallel with a measurement operation by the resistance measurement unit, and performs second control causing the second measurement unit to execute a measurement operation of measuring the second physical property in parallel with the measurement operation by the resistance measurement unit and also causing the second measurement unit to start the driving of the detector in the second measurement unit before the start of the driving of the detector in the first measurement unit.

An image forming system includes an image forming apparatus, a pressure sealing processing apparatus, and a control unit. The control unit is configured to permit execution of the pressure sealing processing process by the pressure sealing processing apparatus on a recording material of which a grammage is smaller than a predetermined grammage, and is configured not to permit execution of the pressure sealing processing process by the pressure sealing processing apparatus on a recording material of which a grammage is equal to or more than the predetermined grammage.

An image forming apparatus includes: a plurality of members for forming an image; a transmitting unit configured to transmit a sonic wave; a receiving unit configured to receive a first sonic wave that has been transmitted from the transmitting unit and has passed through a sheet and a second sonic wave that is generated from at least one of the plurality of members; a detection unit configured to detect information regarding a type or state of the sheet based on the first sonic wave; and a determination unit configured to determine a state of a member that has generated the second sonic wave based on the second sonic wave.

A measurement device includes a measurement unit that measures a physical property of a measurement target by causing the measurement target to vibrate through an application of an ultrasonic wave, the measurement unit including a first mode that measures the physical property using a first burst wave sensitive in a first predetermined range of physical property values and a second mode that measures the physical property using a second burst wave sensitive in a second range of physical property values different from the first range, and a control unit that controls the measurement unit to execute at least one of the first mode and the second mode.

An image forming apparatus includes an image forming portion, a rotatable intermediary transfer belt, a plurality of stretching rollers, an outer roller, a moving mechanism, and a controller. In a case that a basis weight of a first recording material is a first basis weight and a basis weight of a second recording material is a second basis weight greater than the first basis weight, a position of the inner roller is a second position when the toner image is transferred onto the second recording material, and in a case that the basis weight of the first recording material and the basis weight of the second recording material are the second basis weight, the position of the inner roller is a first position when the toner image is transferred onto the second recording material.

An image forming apparatus includes a plurality of members for forming an image; a transmitting unit configured to transmit a sonic wave; a receiving unit configured to receive a first sonic wave that has been transmitted from the transmitting unit and has passed through a sheet and a second sonic wave that is generated from at least one of the plurality of members; a detection unit configured to detect information regarding a type or state of the sheet based on the first sonic wave; and a determination unit configured to determine a state of a member that has generated the second sonic wave based on the second sonic wave.

An image forming apparatus includes a first detector detecting an operation sound based on a sound wave received by a receiver; a second detector detecting basis weight of recording material based on an ultrasonic wave transmitted from a transmitter and received by the receiver; a switching unit that switches destination of a reception signal from the receiver between a first path to the first detector and a second path to the second detector; and a controller that controls the switching unit such that the reception signal is output to the first path at a first timing and to the second path at a second timing. When a predetermined condition is satisfied, the controller controls the switching unit such that the reception signal is output to the second path at the first timing or to the first path at the second timing.