Image forming apparatus

An image forming apparatus for forming a toner image on a recording material, said image forming apparatus comprising:

• an image forming portion configured to form an unfixed toner image on the recording material;
• a fixing portion, including a heating member and a back-up member configured to cooperate with said heating member to form a nip, for fixing the unfixed toner image on the recording material by heating the recording material bearing the unfixed toner image while feeding recording material at the nip;
• and
• an air feeding portion configured to feed air to a non-sheet-passing area of at least one of said heating member and said back-up member, said air feeding portion including a fan configured to feed the air, an opening through which the air fed from said fan passes, and an adjusting member configured to adjust an opening amount of said opening,
• wherein said apparatus is configured to execute a first air feeding operation with a first opening amount of said opening and a first rotational frequency of said fan and a second air feeding operation with a second opening amount of said opening different from the first opening amount and a second rotational frequency of said fan different from the first rotational frequency, when said fixing portion fixes the unfixed toner images on recording materials having the same widths measured in a direction perpendicular to a feeding direction of the recording materials.

An image forming apparatus for forming a toner image on a recording material, said image forming apparatus comprising:

• an image forming portion configured to form an unfixed toner image on the recording material;
• a fixing portion, including a heating member and a back-up member configured to cooperate with said heating member to form a nip, for fixing the unfixed toner image on the recording material by heating the recording material bearing the unfixed toner image in the nip while feeding recording material;
• an air feeding portion configured to feed air to a non-sheet-passing area of at least one of said heating member and said back-up member, said air feeding portion including a fan configured to feed the air, an opening through which the air fed from said fan passes, and an adjusting member configured to adjust an opening amount of said opening;
• and
• a temperature detecting member configured to detect a temperature of the non-sheet-passing area,
• wherein said apparatus is configured to switch between a first air feeding operation with a first opening amount of said opening and a second air feeding operation with a second opening amount of said opening different from the first opening amount according to the temperature detected by said temperature detecting member.