| 摘要 |
An image forming apparatus includes a fixing portion, including a heating member and a back-up member forming a nip; and an air feeding portion for feeding air to a non-sheet-passing area of at least one of the heating member and the back-up member, the air feeding portion including a fan for feeding the air, a duct, including an opening, for guiding the air fed from the fan through the opening to the non-sheet-passing area, and an adjusting member for adjusting an opening amount of the opening. The apparatus executes a first air feeding operation with a first opening amount and a first rotational frequency of the fan and a second air feeding operation with a second opening amount and a second rotational frequency, when the fixing portion fixes the images on sheets having the same widths. |
| 主权项 |
1. An image forming apparatus for forming a toner image on a recording material, said image forming apparatus comprising:
an image forming station for forming an unfixed toner image on the recording material; a fixing portion, including a heating member and a back-up member for cooperating with said heating member to form a nip, for fixing the unfixed toner image on the recording material by heating the recording material having the formed unfixed toner image in the nip while feeding it; and an air feeding portion for feeding 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 for feeding the air, a duct, including an opening, for guiding the air fed from said fan through said opening to the non-sheet-passing area, and an adjusting member for adjusting an opening amount of said opening, wherein said apparatus is capable of executing a first air feeding operation with a first opening amount and a first rotational frequency of said fan and a second air feeding operation with a second opening amount different from the first opening amount and a second rotational frequency different from the first rotational frequency, when said fixing portion fixes the images on recording materials having the same widths measured in a direction perpendicular to a feeding direction of the recording materials. |
