Patent ID: 9557702
Date: 2017-01-31
CPC Classifications: G03G

Claim:
1. An image forming apparatus comprising: an image forming unit configured to form an image on a sheet; a fixing unit configured to fix the image on the sheet while conveying and heating the sheet, on which the image has been formed by the image forming unit, at a first nip portion, the fixing unit including a first fixing member and a second fixing member forming the first nip portion with the first fixing member; a curl correcting unit configured to correct a curl of the sheet while conveying the sheet, on which the image has been fixed by the fixing unit, at a second nip portion, the curl correcting unit including a first curl correcting member and a second curl correcting member forming the second nip portion with the first curl correcting member; a pressure changing mechanism configured to change a pressure applied to the first nip portion and a pressure applied to the second nip portion, the pressure changing mechanism including a rotary member rotating about a rotational axis; and a controller for controlling a rotational phase of the rotary member by rotating the rotary member, wherein the pressure applied to the first nip portion and the pressure applied to the second nip portion are changed according to the rotational phase of the rotary member controlled by the controller, and wherein the rotary member includes a shaft rotating about the rotational axis, a first cam portion, provided on the shaft and rotating with the shaft about the rotational axis, for changing the pressure applied to the first nip portion and a second cam portion, provided on the shaft and rotating with the shaft about the rotational axis, for changing the pressure applied to the second nip portion, the first cam portion and the second cam portion provided on different positions of the shaft in a rotational axis direction of the shaft.