Heating apparatus having a cylindrical film and a pressing element to form a nip

An image processing apparatus comprising:

• an image forming unit configured to form an image on a sheet;
• and
• a fixing unit configured to fix the image on the sheet and including:
• a cylindrical film,
• a pressing element that rotates with the cylindrical film and forms a nip with the cylindrical film, wherein the sheet is conveyed along a conveyance path from an upstream side to a downstream side through the nip,
• a heater inside the cylindrical film, and
• a guide member inside the cylindrical film and including:
• a first guide portion including a first end portion that is located closer to the pressing element than the heater in a direction perpendicular to the conveyance path, and
• a second guide portion located downstream of a downstream end of the heater, wherein
• the nip is formed along the conveyance path between a first position corresponding to the first end portion and a second position corresponding to the downstream end of the heater.