Image forming apparatus

An image forming apparatus comprising:

• a transfer portion for transferring an image onto a sheet while feeding the sheet through a transfer nip;
• a fixing portion for fixing the image on the sheet while feeding the sheet, fed from said transfer portion, through a fixing nip;
• a sheet feeding guide, provided between said transfer portion and said fixing portion, having a guide surface for guiding the sheet;
• a sheet detecting portion, provided at a position between said transfer portion and said fixing portion, for detecting the sheet;
• and
• a controller for controlling a sheet feeding speed of at least one of said transfer portion and said fixing portion depending on an output of said sheet detecting portion so that a feeding attitude of the sheet fed while being sandwiched at both of the transfer nip and the fixing nip is maintained in a predetermined feeding attitude,
• wherein the guide surface of said sheet feeding guide has a most recessed region in a region between said transfer portion and said sheet detecting portion,
• wherein the guide surface in a position where said sheet detecting portion is provided with respect to a sheet feeding direction has a first region where said sheet detecting portion is provided and a second region spaced from said sheet detecting portion more than the first region with respect to a direction perpendicular to the sheet feeding direction, and
• wherein the first region is higher than the second region with respect to a direction perpendicular to the guide surface.