Patent ID: 7941088

Claim:
An image forming apparatus comprising: a discharge device that discharges a recording material having images formed thereon to a stacking portion; an air blow device that blows air to an underside of the recording material discharged by the discharge device, the air blow device blowing the air substantially in a discharge direction of the recording material discharged by the discharge device; and a detection device that detects a height of recording materials stacked on the stacking portion, wherein the detection device detects the height of recording materials at a first preset detection position and a second preset detection position, the second preset detection position being higher than the first preset detection position, wherein the air blow device is stopped when the height of recording materials detected by the detection device has reached the first preset detection position, wherein an image forming operation continues to be performed after the air blow device has been stopped when the height of recording materials detected by the detection device reaches the first preset detection position, and wherein the image forming operation stops when the height of recording materials detected by the detection device reaches the second preset detection position.