Image forming apparatus that controls a fixing device to fix a toner image onto paper with improved productivity

An image forming apparatus having a fixing device which pressurizes and heats an unfixed toner image on a paper sheet as the transfer medium to fix the image on the paper sheet, comprising:

• a detector to detect a thickness of the paper sheet or a thickness information input device to input thickness information of the paper sheet;
• a fixing condition changing device to change a fixing condition based on the detected thickness or the input thickness information;
• and
• a controller to change an output order of fixed images to be printed out based on the thickness of the paper sheet.

An image forming apparatus having a fixing device which pressurizes and heats an unfixed toner image on a paper sheet as the transfer medium to fix the image on the paper sheet, comprising:

• a detector to detect a thickness of the paper sheet or a thickness information input device to input thickness information of the paper sheet;
• a fixing condition changing device to change a fixing condition based on the detected thickness or the input thickness information;
• and
• a controller to change the fixed image output order based on the thickness of the paper sheet and numbers of series of images to be printed out.

An image forming apparatus having a fixing device which pressurizes and heats an unfixed toner image on a paper sheet as the transfer medium to fix the image on the paper sheet, comprising:

• a glossiness changing device;
• a detector to detect a thickness of a the paper sheet or a thickness information input device to input thickness information of the paper sheet;
• a fixing condition changing device to change a fixing condition based on the detected thickness or the input thickness information;
• and
• a controller to change an output order of fixed images to be printed out based on glossiness set by the glossiness changing device, the thickness of the paper sheet, and numbers of series of images to be printed out.

An image forming apparatus having a fixing device which pressurizes and heats an unfixed toner image on a paper sheet as the transfer medium to fix the image on the paper sheet, comprising:

• a glossiness changing device;
• a detector to detect a thickness of the paper sheet or a thickness information input device to input thickness information of the paper sheet;
• a fixing condition changing device to change a fixing condition based on the detected thickness or the input thickness information;
• and
• a controller to change the fixed image output order based on glossinesses of series of fixed images to be printed out and numbers of series of images to be printed out.