Method of controlling image forming apparatus, image forming apparatus and image forming system

An image forming apparatus comprising:

• a paper conveying unit configured to convey banner paper;
• an image forming unit configured to transfer an image to the banner paper;
• a fixing unit provided with a pair of fixing members between which a fixing nip is formed, and configured to fix the image to the banner paper with the fixing members by heating and pressing the banner paper conveyed along a conveying route;
• and
• a control unit configured to control the paper conveying unit, the image forming unit and the fixing unit, wherein
• the control unit identifies information about the paper position on the banner paper that coincides with the position of the fixing nip when the conveyance of the banner paper is halted and information about the amount of paper deformation of the banner paper in the paper position, and output the information which is identified.

An image forming system comprising:

• an image forming apparatus configured to form an image on paper;
• and
• a finisher configured to perform a post-printing process to the paper transferred from the image forming apparatus,
• the image forming apparatus comprising:
• a paper conveying unit configured to convey banner paper as the paper to be processed;
• an image forming unit configured to transfer an image to the banner paper;
• a fixing unit provided with a pair of fixing members between which a fixing nip is formed, and configured to fix the image to the banner paper with the fixing members by heating and pressing the banner paper conveyed along a conveying route;
• and
• a first control unit configured to control the paper conveying unit, the image forming unit and the fixing unit, wherein
• the first control unit identifies information about the paper position on the banner paper that coincides with the position of the fixing nip when the conveyance of the banner paper is halted and information about the amount of paper deformation of the banner paper in the paper position, and output the information which is identified,
• the finisher comprising:
• a post-printing unit configured to perform a post-printing process to the banner paper as the paper to be processed;
• and
• a second control unit configured to control the post-printing unit, wherein
• the second control unit controls the post-printing unit based on the identified information output from the first control unit of the image forming apparatus.