Patent ID: 9599943
Date: 2017-03-21
CPC Classifications: B65H,G01N,G03G

Claim:
1. An image forming apparatus configured to form an image on a recording material, the image forming apparatus comprising: an ultrasonic wave detection unit including a transmission element configured to transmit an ultrasonic wave and a reception element configured to receive the ultrasonic wave transmitted from the transmission element; a first conveyance roller arranged on an upstream side of the ultrasonic wave detection unit in a conveyance direction of the recording material, and configured to convey the recording material toward a position between the transmission element and the reception element; a second conveyance roller arranged on a downstream side of the ultrasonic wave detection unit in the conveyance direction, and configured to convey the recording material conveyed by the first conveyance roller, wherein the first conveyance roller and the second conveyance roller form a loop on the recording material by conveying the recording material at respective different speeds; and a processor configured to control an image forming condition for forming the image on the recording material, based on the ultrasonic wave received by the reception element via the recording material in a first period and not based on the ultrasonic wave received by the reception element via the recording material in a second period, wherein the first period is a period in which no loop is formed on the recording material, and the second period is a period in which a loop is formed on the recording material by the first conveyance roller and the second conveyance roller.